@font-face{font-family:"PT Serif";font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/pt-serif-400.woff2) format("woff2");unicode-range:u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:"PT Serif";font-style:normal;font-weight:700;font-display:swap;src:url(/fonts/pt-serif-700.woff2) format("woff2");unicode-range:u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:"PT Serif";font-style:italic;font-weight:400;font-display:swap;src:url(/fonts/pt-serif-400i.woff2) format("woff2");unicode-range:u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:"PT Serif";font-style:italic;font-weight:700;font-display:swap;src:url(/fonts/pt-serif-700i.woff2) format("woff2");unicode-range:u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:"Noto Serif";font-style:normal;font-weight:400 900;font-display:swap;src:url(/fonts/noto-serif-var.woff2) format("woff2");unicode-range:u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:"Noto Serif";font-style:italic;font-weight:400;font-display:swap;src:url(/fonts/noto-serif-400i.woff2) format("woff2");unicode-range:u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:Alegreya;font-style:normal;font-weight:400 900;font-display:swap;src:url(/fonts/alegreya-var.woff2) format("woff2");unicode-range:u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:Roboto Slab;font-style:normal;font-weight:400 900;font-display:swap;src:url(/fonts/roboto-slab-var.woff2) format("woff2");unicode-range:u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}:root{--ink:#172033;--muted:#667085;--paper:#f7f8fb;--card:#ffffff;--line:#e2e7ef;--blue:#2455d6;--lime:#d6ff67;--font-primary:"PT Serif",Georgia,"Times New Roman",serif;--font-heading:"Noto Serif","PT Serif",Georgia,serif;--font-content:"Alegreya","PT Serif",Georgia,serif;--font-formula:"Roboto Slab","PT Serif",Georgia,serif}.locale-switcher{min-height:50px;padding:3px;display:flex;align-items:center;gap:2px;position:fixed;left:18px;bottom:18px;z-index:62;border:1px solid rgba(216,211,201,.92);border-radius:10px;background:rgba(255,254,250,.94);box-shadow:0 8px 24px rgba(23,32,43,.07);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.locale-switcher a{min-width:44px;height:44px;padding:0 8px;display:grid;place-items:center;border-radius:8px;color:var(--muted);font-size:13px;font-weight:700;letter-spacing:.04em}.locale-switcher a[aria-current=page]{background:var(--ink);color:white}.locale-switcher a:hover{color:var(--blue)}.locale-switcher[data-loading=true]{pointer-events:none}.locale-switcher[data-loading=true] a:not([aria-current=page]){opacity:.46}.locale-loading{position:fixed;inset:0;z-index:90;display:grid;place-items:center;padding:24px;background:rgba(247,248,251,.56);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);animation:locale-loading-in .16s ease-out both}.locale-loading-card{min-width:min(100%,272px);padding:14px 17px 14px 14px;display:flex;align-items:center;gap:12px;border:1px solid rgba(216,211,201,.88);border-radius:14px;background:rgba(255,255,255,.96);box-shadow:0 18px 45px rgba(23,32,51,.14);color:var(--ink)}.locale-loading-card>div{display:grid;gap:2px}.locale-loading-card strong{font-size:13px;line-height:1.25}.locale-loading-card span:last-child{color:var(--muted);font-size:12px}.locale-loading-spinner{width:28px;height:28px;flex:0 0 28px;border:3px solid #e4e9f2;border-top:3px solid var(--blue);border-radius:50%;animation:locale-loading-spin .7s linear infinite}@keyframes locale-loading-in{0%{opacity:0}to{opacity:1}}@keyframes locale-loading-spin{to{transform:rotate(1turn)}}@media (prefers-reduced-motion:reduce){.locale-loading,.locale-loading-spinner{animation:none}}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-primary);line-height:1.5;-webkit-font-smoothing:antialiased}.eyebrow,h1,h2,h3{font-family:var(--font-heading)}a{color:inherit;text-decoration:none}button,input{font:inherit}button:not(:disabled),summary{cursor:pointer}:where(a,button,summary,input,label[tabindex]):focus-visible{outline:3px solid var(--blue);outline-offset:3px}.visually-hidden{width:1px;height:1px;padding:0;margin:-1px;position:absolute;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.math-formula[aria-busy=true]{min-width:1.5em;min-height:1em;display:inline-grid;place-items:center;vertical-align:middle}.math-formula[aria-busy=true]:before{width:.7em;height:.7em;display:block;border:2px solid #dce4f0;border-top:2px solid var(--blue);border-radius:50%;content:"";animation:math-formula-loading .7s linear infinite}@keyframes math-formula-loading{to{transform:rotate(1turn)}}@media (prefers-reduced-motion:reduce){.math-formula[aria-busy=true]:before{animation:none}}.topbar{height:76px;padding:0 clamp(22px,5vw,76px);display:grid;grid-template-columns:minmax(180px,1fr) auto auto;gap:clamp(18px,3vw,42px);border-bottom:1px solid var(--line);background:rgba(255,255,255,.94);position:sticky;top:0;z-index:20;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.brand,.topbar{align-items:center}.brand{min-height:44px;display:inline-flex;gap:11px;font-weight:800;font-size:19px;letter-spacing:-.02em;width:max-content}.brand-mark{width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:var(--ink);color:var(--lime);font-family:Georgia,serif;font-size:24px}.topbar nav{display:flex;gap:24px;color:var(--muted);font-size:14px}.topbar nav a{padding:28px 0 25px;transition:color .2s ease}.topbar nav a:hover{color:var(--blue)}.topbar nav .active{color:var(--blue);box-shadow:inset 0 -2px var(--blue)}.topbar-account{min-height:44px;padding:0 16px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:999px;color:var(--ink);font-size:14px;font-weight:700;transition:border-color .2s ease,background .2s ease,color .2s ease}.topbar-account.active,.topbar-account:hover{border-color:var(--blue);background:var(--blue);color:white}.learning-nav-link{display:inline-flex;align-items:center;gap:7px}.learning-nav-link small{padding:3px 6px;border-radius:999px;background:#e5e0d6;color:#6c6559;font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase}.release-status{min-height:36px;padding:8px clamp(22px,5vw,76px);display:flex;align-items:center;justify-content:center;gap:9px;border-bottom:1px solid #34404d;background:var(--ink);color:#dbe1e8;font-size:12px;line-height:1.45;text-align:center}.release-status strong{color:var(--lime)}.release-status strong:after{content:"·";margin-left:9px;color:#6f7c8a}.portal-choice-page{min-height:100vh;background:radial-gradient(circle at 82% 18%,rgba(214,255,103,.2),transparent 25%),var(--paper)}.portal-choice{min-height:calc(100vh - 76px);padding:clamp(56px,7vw,92px) clamp(22px,7vw,108px);display:grid;justify-items:center;align-content:center;gap:clamp(28px,4vw,44px)}.portal-choice-intro{width:min(920px,100%);text-align:center}.portal-choice-intro .eyebrow{margin-bottom:10px}.portal-choice-intro h1{margin:0;font-size:clamp(42px,6vw,72px);line-height:1;letter-spacing:-.055em}.portal-choice-intro>p:last-child{max-width:600px;margin:16px auto 0;color:var(--muted);font-size:16px}.portal-choice-grid{width:min(920px,100%);display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.portal-choice-card{min-height:238px;padding:26px;display:flex;flex-direction:column;align-items:flex-start;position:relative;overflow:hidden;border:1px solid var(--line);border-radius:20px;background:var(--card);color:var(--ink);cursor:pointer;text-align:left;box-shadow:0 12px 34px rgba(23,32,51,.055);transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}.portal-choice-card:hover{transform:translateY(-3px);border-color:var(--blue);box-shadow:0 18px 42px rgba(23,32,51,.1)}.portal-choice-card.reference{border-color:rgba(36,85,214,.38)}.portal-choice-card.learning{background:var(--card);color:var(--ink)}.portal-choice-symbol{width:48px;height:48px;margin:0 0 32px;display:grid;place-items:center;border-radius:14px;background:#edf2ff;color:var(--blue);font-family:Georgia,serif;font-size:36px;line-height:1}.learning .portal-choice-symbol{background:var(--ink);color:var(--lime)}.portal-choice-copy{display:grid;gap:6px}.portal-choice-copy strong{font-size:clamp(24px,2.5vw,32px);letter-spacing:-.04em}.portal-choice-copy small{color:var(--muted);font-size:12px}.portal-choice-action{width:max-content;min-height:42px;margin-top:auto;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;gap:18px;border:0;border-radius:10px;background:var(--blue);color:white;font-size:12px;font-weight:700}.learning .portal-choice-action{background:var(--ink);color:white}.portal-choice-action b{color:var(--lime);font-size:18px}.hero{min-height:565px;padding:clamp(72px,10vw,130px) clamp(22px,8vw,128px) 68px;position:relative;overflow:hidden;border-bottom:1px solid var(--line)}.hero:after{content:"Σ";position:absolute;right:4vw;top:-95px;color:rgba(35,72,219,.08);font-family:Georgia,serif;font-size:clamp(360px,50vw,680px);line-height:1;transform:rotate(-7deg);pointer-events:none}.eyebrow{margin:0 0 18px;font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--blue)}.hero h1{margin:0;max-width:760px;font-size:clamp(58px,8.2vw,118px);line-height:.86;letter-spacing:-.065em;position:relative;z-index:1}.hero h1 em{font-family:Georgia,serif;font-weight:400;color:var(--blue)}.hero-copy{max-width:600px;margin:34px 0 46px;color:var(--muted);font-size:18px;line-height:1.65}.hero-actions,.hero-copy{position:relative;z-index:1}.hero-actions{margin-bottom:48px;display:flex;flex-wrap:wrap;gap:10px}.hero-action{width:max-content;min-height:50px;padding:14px 18px;display:flex;align-items:center;justify-content:space-between;gap:26px;border:1px solid var(--ink);border-radius:9px;background:var(--ink);color:white;font-size:13px;font-weight:750;transition:transform .2s ease,background .2s ease,border-color .2s ease}.hero-action span{color:var(--lime);font-size:18px}.hero-action:hover{transform:translateY(-2px);background:var(--blue)}.hero-secondary{background:rgba(255,254,250,.72);color:var(--ink)}.hero-secondary span{color:var(--blue)}.hero-secondary:hover{border-color:var(--blue);color:white}.hero-stats{display:flex;gap:50px;position:relative;z-index:1}.hero-stats div{display:grid;gap:2px}.hero-stats strong{font-size:23px}.hero-stats span{color:var(--muted);font-size:12px}.quick-paths{padding:18px clamp(22px,5vw,76px);display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;border-bottom:1px solid var(--line);background:#fffefa}.quick-paths>a{min-height:108px;padding:18px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:13px;align-items:start;border:1px solid var(--line);border-radius:12px;background:#f8f5ee;transition:border-color .18s ease,background .18s ease,transform .18s ease}.quick-paths>a:hover{border-color:var(--blue);background:#f2f5ff;transform:translateY(-2px)}.quick-paths>a>span{color:var(--blue);font-size:12px;font-weight:700}.quick-paths div{display:grid;gap:6px}.quick-paths b{font-size:15px}.quick-paths p{margin:0;color:var(--muted);font-size:12px;line-height:1.5}.quick-paths i{color:var(--blue);font-size:17px;font-style:normal}.catalog{padding:74px clamp(22px,5vw,76px) 110px;background:var(--paper)}.catalog-head{display:flex;align-items:end;justify-content:space-between;flex-wrap:wrap;gap:20px 30px}.catalog h2{margin:0;font-size:clamp(34px,4vw,58px);letter-spacing:-.045em}.reference-catalog{min-height:calc(100vh - 76px);padding-top:clamp(46px,6vw,76px);overflow-anchor:none}.mobile-reference-track,.reference-controls-slide{display:contents}.formula-card-back,.mobile-quantity-index{display:none}.reference-catalog .catalog-head{display:grid;grid-template-columns:minmax(280px,.72fr) minmax(420px,1.1fr);align-items:end;gap:clamp(36px,6vw,90px)}.reference-catalog .catalog-head h1{margin:0;font-size:clamp(40px,4.5vw,60px);line-height:1;letter-spacing:-.05em}.reference-catalog .catalog-head>div>p:last-child{max-width:500px;margin:17px 0 0;color:var(--muted);font-size:12px;line-height:1.6}.reference-catalog .search{width:100%;height:62px}.catalog-alphabet{margin:22px 0 12px;overflow:hidden;border:1px solid var(--line);border-radius:12px;background:var(--card)}.catalog-alphabet>summary{min-height:52px;padding:0 16px;display:flex;align-items:center;gap:10px;list-style:none;color:var(--ink);font-size:12px;font-weight:700}.catalog-alphabet>summary::-webkit-details-marker{display:none}.catalog-alphabet>summary:before{content:"+";width:25px;height:25px;display:grid;place-items:center;border-radius:50%;background:#edf2ff;color:var(--blue);font-size:16px}.catalog-alphabet[open]>summary:before{content:"−"}.catalog-alphabet>summary small{margin-left:auto;color:var(--muted);font-size:12px;font-weight:650}.catalog-alphabet>nav{padding:0 16px 16px;border-top:1px solid var(--line)}.catalog-alphabet-heading{display:flex;align-items:end;justify-content:space-between;gap:24px}.catalog-alphabet-heading strong{font-size:20px;letter-spacing:-.025em}.catalog-alphabet .letter-row{margin:15px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(44px,1fr));gap:7px;border:0;background:transparent}.mobile-alphabet-carousel{display:none}.catalog-mode-actions{margin:12px 0 22px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.all-formulas-button{min-height:54px;padding:8px 16px;display:flex;align-items:flex-start;justify-content:center;flex-direction:column;gap:2px;border:1px solid var(--line);border-radius:11px;background:var(--card);color:var(--ink);cursor:pointer;text-align:left}.all-formulas-button span{font-size:13px;font-weight:700}.all-formulas-button small{color:var(--muted);font-size:12px}.all-formulas-button.selected{border-color:#b9c8f4;background:#f1f5ff;color:var(--blue)}.catalog-filter-panel{margin:0;border:1px solid var(--line);border-radius:11px;background:var(--card);overflow:hidden}.catalog-filter-panel[open]{grid-column:1/-1}.catalog-filter-panel>summary{min-height:54px;padding:0 16px;display:flex;align-items:center;gap:11px;cursor:pointer;list-style:none;background:var(--card);color:var(--ink);font-size:12px;font-weight:700}.catalog-filter-panel>summary::-webkit-details-marker{display:none}.catalog-filter-panel>summary:before{content:"+";width:27px;height:27px;display:grid;flex:0 0 auto;place-items:center;border-radius:50%;background:#edf2ff;color:var(--blue);font-size:17px}.catalog-filter-panel[open]>summary:before{content:"−"}.catalog-filter-summary-copy{min-width:0;display:flex;flex-wrap:wrap;align-items:baseline;gap:2px 10px}.catalog-filter-summary-copy strong{font-size:13px;line-height:1.3}.catalog-filter-summary-copy small{color:var(--muted);font-size:12px;font-weight:600;line-height:1.3}.catalog-filter-count{width:25px;height:25px;margin-left:auto;display:grid;place-items:center;border-radius:999px;background:var(--blue);color:white;font-size:12px}.catalog-filter-panel .filter-block{margin:0;padding:18px 15px 15px;border-top:1px solid #d5cfc4}.reference-catalog .result-line{margin-top:0}.search{width:min(440px,100%);min-width:0;flex:1 1 260px;height:58px;padding:0 14px 0 20px;display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 30px rgba(23,32,43,.05)}.search>span{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.search input{width:100%;min-width:0;border:0;outline:0;background:transparent;color:var(--ink);font-size:16px}.search:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px rgba(35,72,219,.1),0 12px 30px rgba(23,32,43,.05)}.filter-block{margin-top:42px;display:grid;gap:12px}.filter-group{display:grid;grid-template-columns:100px minmax(0,1fr);align-items:start;gap:12px}.filter-label{padding-top:10px;color:var(--muted);font-size:12px;font-weight:750;text-transform:uppercase;letter-spacing:.08em}.grade-row,.topic-row{display:flex;gap:7px;overflow-x:auto;scrollbar-width:thin;padding-bottom:5px}.grade-row button,.topic-row button{padding:9px 13px;flex:0 0 auto;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.35);color:var(--muted);cursor:pointer;font-size:12px;transition:background .18s ease,color .18s ease}.topic-row button.selected,.topic-row button:hover{background:var(--blue);border-color:var(--blue);color:white}.grade-row button.selected,.grade-row button:hover{background:var(--ink);border-color:var(--ink);color:var(--lime)}.grade-note{margin:1px 0 0 112px;color:var(--muted);font-size:12px;line-height:1.5}.letter-row{margin:42px 0 24px;padding:15px;display:flex;flex-wrap:wrap;gap:7px;border:1px solid var(--line);border-radius:14px;background:rgba(255,255,255,.38)}.letter-row button{min-width:40px;height:40px;padding:0 10px;border:0;border-radius:8px;background:transparent;color:var(--muted);cursor:pointer;font-weight:750}.letter-row button.selected,.letter-row button:hover{background:var(--ink);color:var(--lime)}.letter-row button:focus-visible{outline:3px solid var(--blue);outline-offset:2px}.result-line{min-height:36px;margin-bottom:18px;display:flex;align-items:center;flex-wrap:wrap;gap:10px 16px;color:var(--muted);font-size:14px}.interaction-hint{margin-left:auto;display:inline-flex;align-items:center;gap:7px;color:#4e5968}.interaction-hint i{width:20px;height:20px;display:inline-grid;place-items:center;border-radius:50%;background:var(--blue);color:white;font-size:13px;font-style:normal;font-weight:700}.reset-button{min-height:44px;padding:6px 13px;border:1px solid var(--line);border-radius:8px;background:transparent;color:var(--blue);cursor:pointer;font-size:14px}.formula-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;overflow-anchor:none}.formula-card{min-height:270px;padding:24px;display:flex;flex-direction:column;border:1px solid var(--line);border-radius:16px;background:var(--card);box-shadow:0 8px 24px rgba(23,32,51,.035);scroll-margin-top:92px}.formula-card:focus{outline:0;border-color:var(--blue);box-shadow:0 0 0 3px rgba(35,72,219,.13)}.formula-card.expanded{grid-column:span 2}.card-top{display:none}.meta{display:flex;align-items:center;justify-content:space-between}.letter-badge{width:33px;height:33px;display:grid;place-items:center;border-radius:8px;background:var(--lime);font-weight:900}.topic{color:var(--muted);font-size:12px}.card-top{gap:12px}.formula-card h3{margin:0 0 14px;font-size:23px;letter-spacing:-.035em;overflow-wrap:anywhere}.topic{min-width:0;line-height:1.35;text-align:right;overflow-wrap:anywhere}.meta{justify-content:flex-start;flex-wrap:wrap;gap:8px}.meta>span{padding:5px 8px;border:1px solid var(--line);border-radius:6px;color:var(--muted);font-size:12px}.meta .entry-grades{display:none}.meta .unit-full-name{width:100%;padding:0;border:0;color:#777065;font-size:12px;line-height:1.4}.meta .unit-full-name b{color:var(--ink);font-weight:750}.equations{margin-top:22px;display:grid;gap:8px}.formula-line{min-width:0;padding-top:9px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid #ebe7dd}.equation-math{min-width:0;padding:3px 0;display:block}.equation-math .katex{font-size:1.03rem}.math-formula .katex-html{white-space:nowrap}.math-formula[data-layout=fluid]{box-sizing:border-box;min-width:0;width:100%;max-width:100%;display:block;overflow:visible}.math-formula[data-layout=fluid] .katex,.math-formula[data-layout=fluid] .katex-html{max-width:100%;white-space:normal}.math-formula[data-layout=fluid] .katex-html>.base{margin-block:.08em;transform-origin:left center}.interactive-math .formula-quantity{margin:-3px -1px;padding:3px 1px;border-bottom:1px dotted rgba(36,85,214,.58);border-radius:4px;color:var(--blue);cursor:pointer;outline:none;transition:color .16s ease,background-color .16s ease,box-shadow .16s ease}.interactive-math .formula-quantity:focus-visible,.interactive-math .formula-quantity:hover{background:rgba(216,255,87,.78);color:#102aa2;box-shadow:0 0 0 2px rgba(35,72,219,.16)}.quantity-tooltip{position:fixed;z-index:1000;width:max-content;max-width:min(300px,calc(100vw - 32px));padding:11px 40px 11px 13px;border:1px solid rgba(216,255,87,.4);border-radius:9px;background:#101923;color:#f7f5ef;box-shadow:0 14px 38px rgba(10,18,29,.24);font-size:13px;font-weight:500;line-height:1.45;pointer-events:auto;text-align:left;white-space:normal}.quantity-tooltip>button{width:32px;height:32px;padding:0;display:grid;place-items:center;position:absolute;right:4px;top:4px;border:0;border-radius:7px;background:transparent;color:inherit;cursor:pointer;font-size:21px;line-height:1}.quantity-tooltip>button:focus-visible,.quantity-tooltip>button:hover{background:rgba(255,255,255,.12)}.quantity-tooltip[data-placement=above]{transform:translate(-50%,-100%)}.quantity-tooltip[data-placement=below]{transform:translateX(-50%)}.quantity-tooltip:after{content:"";position:absolute;left:50%;width:8px;height:8px;background:#101923;transform:translateX(-50%) rotate(45deg)}.quantity-tooltip[data-placement=above]:after{bottom:-5px;border-right:1px solid rgba(216,255,87,.4);border-bottom:1px solid rgba(216,255,87,.4)}.quantity-tooltip[data-placement=below]:after{top:-5px;border-left:1px solid rgba(216,255,87,.4);border-top:1px solid rgba(216,255,87,.4)}.formula-grade-list{display:none}.formula-grade-list b{padding:3px 5px;border-radius:4px;background:#e9eeff;color:var(--blue);font-size:12px;font-weight:700;white-space:nowrap}.condition{margin:16px 0 0;padding:10px 11px;border-radius:7px;background:#f1f5ff;color:#516077;font-size:12px;line-height:1.5}.condition b,.expand-button{color:var(--blue)}.expand-button{width:100%;min-height:42px;margin-top:14px;padding:10px 12px;border:1px solid #c9d2f5;border-radius:8px;background:#f1f4ff;cursor:pointer;font-size:12px;font-weight:700;text-align:left}.expand-button:hover{border-color:var(--blue);background:#e8edff}.catalog-load-more{min-height:50px;margin:22px auto 0;padding:0 18px;display:flex;align-items:center;gap:10px;border:1px solid var(--blue);border-radius:10px;background:var(--card);color:var(--blue);font-size:12px;font-weight:700}.catalog-load-more:hover{background:var(--blue);color:white}.catalog-load-more span{min-width:24px;height:24px;padding:0 7px;display:grid;place-items:center;border-radius:999px;background:#edf2ff;color:var(--blue);font-size:12px}.formula-list-access{min-height:48px;padding:7px 16px;display:flex;align-items:center;gap:11px;position:fixed;right:22px;bottom:22px;z-index:34;border:1px solid #2d3947;border-radius:12px;background:rgba(23,32,43,.96);color:white;box-shadow:0 15px 38px rgba(10,18,29,.22);font-size:14px;font-weight:700;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.formula-list-access:before{content:"Σ";color:var(--lime);font-family:Georgia,serif;font-size:18px;font-weight:400}.formula-list-access b{min-width:31px;height:31px;padding:0 7px;display:grid;place-items:center;border-radius:8px;background:var(--lime);color:var(--ink);font-size:12px}.formula-list-access:hover{border-color:var(--blue);background:var(--blue)}.formula-grid{scroll-margin-top:96px}.empty-state{min-height:340px;display:grid;place-items:center;align-content:center;text-align:center;border:1px dashed #c8c1b4;border-radius:16px;color:var(--muted)}.empty-state>span{font-family:Georgia,serif;font-size:68px;color:var(--blue)}.empty-state h3{margin:4px 0 0;color:var(--ink);font-size:24px}.empty-state p{max-width:42ch;margin:8px 0 20px;font-size:16px;line-height:1.5}.empty-state button{min-height:48px;padding:0 18px;border:0;border-radius:9px;background:var(--ink);color:white;cursor:pointer;font-family:inherit;font-size:15px;font-weight:700}.constants-page{min-height:100vh;background:var(--paper)}.constants-page>footer{background:white;color:var(--ink)}.constants-hub{min-height:calc(100vh - 76px);padding:clamp(52px,6vw,82px) clamp(22px,6vw,92px);display:grid;place-items:center;background:var(--paper);color:var(--ink)}.constants-list-shell{width:min(1120px,100%)}.constants-list-head{margin-bottom:20px;display:flex;align-items:end;justify-content:space-between;gap:24px}.constants-list-head>div{min-width:0}.constants-list-head .eyebrow{margin-bottom:8px;color:var(--blue)}.constants-list-head h1{margin:0;font-size:clamp(38px,5vw,58px);line-height:1;letter-spacing:-.05em}.constants-list-head>a{min-height:42px;padding:0 13px;display:inline-flex;flex:0 0 auto;align-items:center;border:1px solid var(--line);border-radius:9px;background:white;color:var(--blue);font-size:12px;font-weight:700}.constants-list-head>a b{display:none}.constants-compact-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));overflow:hidden;border:1px solid var(--line);border-radius:16px;background:white;box-shadow:0 12px 34px rgba(23,32,51,.04)}.constant-compact-row{min-height:76px;padding:12px 16px;display:grid;grid-template-columns:48px minmax(0,1fr) auto;align-items:center;gap:12px;border-bottom:1px solid var(--line);color:var(--ink)}.constant-compact-row:nth-child(odd){border-right:1px solid var(--line)}.constant-compact-row:nth-last-child(-n+2){border-bottom:0}.constant-compact-symbol{color:var(--blue)}.constant-compact-symbol .katex{font-size:21px}.constant-compact-name{min-width:0;display:grid;gap:3px}.constant-compact-name b{font-size:12px;font-weight:700;line-height:1.3;overflow-wrap:anywhere}.constant-compact-name small{color:var(--muted);font-size:12px;line-height:1.35;overflow-wrap:anywhere}.constant-compact-value{width:100%;max-width:100%;color:var(--ink)}.constant-compact-value .katex{font-size:13px}.contacts-page{min-height:100vh;background:var(--paper)}.contacts-page>footer{background:white;color:var(--ink)}.contacts-hub{min-height:calc(100vh - 76px);padding:clamp(52px,6vw,82px) clamp(22px,6vw,92px);display:grid;place-items:center;background:var(--paper);color:var(--ink)}.contacts-shell{width:min(1120px,100%)}.contacts-heading{max-width:680px;margin-bottom:28px}.contacts-heading .eyebrow{margin-bottom:9px;color:var(--blue)}.contacts-heading h1{margin:0;font-size:clamp(44px,6vw,68px);line-height:1;letter-spacing:-.055em}.contacts-heading>p:last-child{margin:16px 0 0;color:var(--muted);font-size:14px;line-height:1.55}.contacts-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.contact-card{min-width:0;min-height:180px;padding:22px;display:flex;flex-direction:column;justify-content:space-between;gap:24px;border:1px solid var(--line);border-radius:16px;background:white;color:var(--ink);box-shadow:0 10px 28px rgba(23,32,51,.035);transition:border-color .2s ease,transform .2s ease,background .2s ease}.contact-card:hover{border-color:var(--blue);background:#f7f9ff;transform:translateY(-2px)}.contact-card-support{border-color:rgba(36,85,214,.38);background:#f1f5ff;color:var(--ink)}.contact-card-support:hover{border-color:var(--blue);background:#eaf0ff}.contact-card-copy{min-width:0;display:grid;gap:8px}.contact-card-copy small{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.1em}.contact-card-support .contact-card-copy small{color:var(--blue)}.contact-card-copy strong{overflow-wrap:anywhere;font-size:clamp(17px,2vw,24px);line-height:1.1;letter-spacing:-.025em}.contact-card-copy>span{color:var(--muted);font-size:12px;line-height:1.45}.contact-card-support .contact-card-copy>span{color:var(--muted)}.contact-card-action{width:max-content;min-height:36px;padding:0 12px;display:inline-flex;align-items:center;border:1px solid var(--blue);border-radius:8px;color:var(--blue);font-size:12px}.contacts-author{min-height:58px;margin-top:12px;padding:12px 16px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:16px;border:1px solid var(--line);border-radius:12px;background:rgba(255,255,255,.58);color:var(--ink)}.contacts-author small,.contacts-author span{color:var(--muted);font-size:12px}.contacts-author strong{font-size:13px}.seo-page{min-height:100vh;background:var(--paper)}.seo-shell{width:min(1160px,calc(100% - 44px));margin:0 auto;padding:30px 0 64px}.seo-breadcrumbs{margin-bottom:24px;color:var(--muted);font-size:14px}.seo-breadcrumbs ol{margin:0;padding:0;display:flex;flex-wrap:wrap;gap:7px;list-style:none}.seo-breadcrumbs li{gap:7px}.seo-breadcrumbs a,.seo-breadcrumbs li{min-height:44px;display:inline-flex;align-items:center}.seo-breadcrumbs a{min-width:44px;justify-content:center}.seo-breadcrumbs li:not(:last-child):after{content:"/";color:#b4aea3}.seo-breadcrumbs a:hover{color:var(--blue)}.seo-hero{padding:clamp(28px,5vw,64px);border-radius:18px;background:var(--ink);color:white}.seo-content-section .eyebrow,.seo-detail-hero .eyebrow,.seo-hero .eyebrow{margin:0 0 10px;color:var(--lime)}.seo-hero h1{max-width:900px;margin:0;font-size:clamp(38px,6vw,76px);line-height:.94;letter-spacing:-.055em}.seo-hero>p:not(.eyebrow){max-width:760px;margin:20px 0 0;color:#cdd5dd;font-size:16px;line-height:1.55}.seo-summary{margin-top:24px;display:flex;flex-wrap:wrap;gap:8px}.seo-summary span{min-height:44px;padding:9px 14px;display:inline-flex;align-items:center;gap:7px;border:1px solid #43505d;border-radius:999px;color:#c3ccd6;font-size:14px}.seo-summary b{color:var(--lime);font-size:16px}.seo-topic-list{margin-top:18px;display:grid;gap:14px}.seo-content-section,.seo-topic-section{padding:clamp(18px,3vw,30px);border:1px solid var(--line);border-radius:14px;background:#fffefb}.seo-content-section>header,.seo-topic-section>header{margin-bottom:16px;display:flex;align-items:flex-start;justify-content:space-between;gap:18px}.seo-content-section>header h2,.seo-topic-section>header h2{margin:0;font-size:clamp(22px,3vw,32px);letter-spacing:-.035em}.seo-topic-section>header p{margin:6px 0 0;color:var(--muted);font-size:12px;line-height:1.5}.seo-content-section>header>span,.seo-topic-section>header>span{flex:0 0 auto;min-width:34px;min-height:34px;padding:6px 14px;display:grid;place-items:center;border-radius:999px;background:var(--ink);color:var(--lime);font-size:14px;font-weight:700;white-space:nowrap}.seo-link-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.seo-entity-link{min-width:0;min-height:72px;padding:13px 15px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:12px;border:1px solid var(--line);border-radius:10px;background:var(--paper);transition:border-color .2s ease,background .2s ease}.seo-entity-link:hover{border-color:var(--blue);background:#f1f4ff}.seo-entity-link>span{min-width:0;display:grid;gap:4px}.seo-entity-link strong{font-size:16px;line-height:1.3}.seo-entity-link small{overflow:hidden;color:var(--muted);font-size:14px;line-height:1.4;text-overflow:ellipsis}.seo-entity-link>b{color:var(--blue)}.seo-entity-symbol{width:42px;color:var(--blue);text-align:center}.seo-grade-grid{margin-top:18px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.seo-grade-card{min-height:230px;padding:24px;display:flex;flex-direction:column;align-items:flex-start;border:1px solid var(--line);border-radius:14px;background:#fffefb}.seo-grade-card>span{color:var(--blue);font-size:14px;font-weight:700}.seo-grade-card>strong{margin-top:30px;font-size:clamp(24px,3vw,36px);line-height:1;letter-spacing:-.04em}.seo-grade-card p{margin:10px 0 0;color:var(--muted);font-size:16px;line-height:1.5}.seo-grade-card small{margin-top:auto;padding-top:18px;color:var(--muted);font-size:14px}.seo-grade-card>b{align-self:flex-end;color:var(--blue);font-size:20px}.seo-cross-links{margin-top:18px;display:flex;flex-wrap:wrap;gap:8px}.seo-cross-links a,.seo-primary-action{min-height:48px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--ink);border-radius:999px;background:var(--ink);color:white;font-size:14px;font-weight:700}.section-modes{margin-top:30px;padding-top:24px;border-top:1px solid var(--line)}.section-modes h2{margin:0 0 14px;font-size:18px;letter-spacing:-.02em}.section-modes-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(232px,1fr));gap:10px}.section-mode-card{min-height:128px;padding:16px 17px;display:grid;align-content:start;gap:5px;position:relative;border:1px solid var(--line);border-radius:14px;background:var(--card);color:var(--ink)}.section-mode-card:hover{border-color:var(--blue)}.section-mode-role{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.02em}.section-mode-card strong{font-size:17px;letter-spacing:-.02em}.section-mode-card p{margin:2px 0 0;color:var(--muted);font-size:14px;line-height:1.45}.section-mode-card b{position:absolute;right:15px;top:15px;color:var(--muted);font-size:15px}.section-mode-card:hover b{color:var(--blue)}.seo-cross-links a:hover,.seo-primary-action:hover{background:var(--blue);border-color:var(--blue)}.seo-detail-hero .seo-primary-action,.seo-hero .seo-primary-action{border-color:var(--lime);background:var(--lime);color:var(--ink)}.seo-detail-hero .seo-primary-action:hover,.seo-hero .seo-primary-action:hover{border-color:white;background:white;color:var(--ink)}.seo-detail-page{display:grid;gap:14px}.seo-hero-action{display:grid;justify-items:start;gap:11px;max-width:300px}.seo-hero-action p{margin:0;color:#bac3ce;font-size:14px;line-height:1.5}.seo-section-note{margin:5px 0 0;color:var(--muted);font-size:14px;line-height:1.45}.seo-detail-page .seo-breadcrumbs{margin-bottom:0}.seo-detail-hero{padding:clamp(24px,5vw,54px);display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:30px;border-radius:18px;background:var(--ink);color:white}.seo-detail-hero h1{max-width:850px;margin:0;font-size:clamp(34px,5vw,66px);line-height:.96;letter-spacing:-.05em}.seo-detail-hero p:not(.eyebrow){max-width:760px;margin:16px 0 0;color:#cdd5dd;font-size:16px;line-height:1.55}.seo-quantity-card{min-width:190px;min-height:190px;padding:20px;display:grid;place-items:center;gap:5px;border-radius:14px;background:var(--lime);color:var(--ink);text-align:center}.seo-quantity-card .math-formula:first-child .katex{font-size:42px}.seo-quantity-card>span{font-size:14px;font-weight:700}.seo-quantity-card small{color:#414d18;font-size:13px}.seo-formula-list{display:grid;gap:8px}.seo-formula-row{min-width:0;min-height:74px;padding:14px 16px;display:grid;grid-template-columns:minmax(0,1fr);align-items:center;gap:9px;border:1px solid var(--line);border-radius:10px;background:var(--paper)}.seo-formula-math{min-width:0}.seo-formula-row>span{color:var(--muted);font-size:14px;text-align:left}.seo-note{margin:12px 0 0;padding:13px 15px;border-left:3px solid var(--blue);background:#f1f4ff;color:#3f4a61;font-size:15px;line-height:1.55}.seo-definition-list{margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.seo-definition-list>div{min-width:0;padding:11px 13px;display:grid;grid-template-columns:70px minmax(0,1fr);align-items:center;gap:10px;border:1px solid var(--line);border-radius:9px;background:var(--paper)}.seo-definition-list dt{color:var(--blue);text-align:center}.seo-definition-list dd{margin:0;color:var(--muted);font-size:14px;line-height:1.45}.seo-learning-items,.seo-problem-list{display:grid;gap:9px}.seo-learning-card,.seo-problem-card{min-width:0;padding:16px;border:1px solid var(--line);border-radius:10px;background:var(--paper)}.seo-learning-card>header{display:flex;align-items:center;justify-content:space-between;gap:14px}.seo-learning-card h3,.seo-problem-card h3{margin:0;font-size:17px;line-height:1.3}.seo-learning-card p,.seo-problem-card p{margin:9px 0 0;color:#414c58;font-size:16px;line-height:1.5}.seo-learning-formula>.seo-formula-math{margin:14px 0;display:block;text-align:center}.seo-problem-card>header{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:10px}.seo-problem-card>header>span{color:var(--blue);font-size:14px;font-weight:700;white-space:nowrap}.seo-problem-card>header>small{min-width:0;color:var(--muted);font-size:13px;overflow-wrap:anywhere;text-align:right}.seo-problem-options{margin:12px 0 0;padding:0;display:grid;grid-template-columns:minmax(0,1fr);gap:7px;list-style:none;counter-reset:problem-option}.seo-problem-options li{min-width:0;min-height:48px;padding:9px 11px;display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:9px;border:1px solid var(--line);border-radius:8px;background:white;counter-increment:problem-option}.seo-problem-options li:before{content:counter(problem-option);color:var(--blue);font-size:13px;font-weight:700}.seo-collection-grid{margin-top:18px}.seo-collection-link{min-height:120px}.seo-collection-link em{color:var(--blue);font-size:13px;font-style:normal;font-weight:700}.seo-adjacent-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(212px,1fr));gap:8px}.seo-adjacent-links a{min-height:76px;padding:13px 15px;display:grid;gap:4px;border:1px solid var(--line);border-radius:10px;background:#fffefb}.seo-adjacent-links small{color:var(--blue);font-size:13px;font-weight:700}.seo-adjacent-links strong{font-size:16px;line-height:1.35}.not-found-shell{min-height:calc(100vh - 208px);padding:60px 22px;display:grid;place-content:center;justify-items:center;text-align:center}.not-found-shell>span{color:var(--blue);font-family:Georgia,serif;font-size:clamp(80px,18vw,180px);line-height:.8}.not-found-shell h1{margin:24px 0 0;font-size:clamp(28px,5vw,54px)}.not-found-shell p{margin:10px 0 22px;color:var(--muted)}.not-found-shell nav{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}.not-found-shell nav a,.not-found-shell nav button{min-height:44px;padding:10px 13px;display:inline-flex;align-items:center;border:1px solid var(--line);border-radius:999px;background:white;color:var(--blue);font-size:12px;font-weight:700}.not-found-shell nav button{cursor:pointer}.not-found-shell nav a:hover,.not-found-shell nav button:hover{border-color:var(--blue)}.not-found-digest{margin:18px 0 0;color:var(--muted);font-size:12px}footer{min-height:108px;padding:22px clamp(22px,5vw,76px);display:grid;grid-template-columns:minmax(220px,1fr) auto;grid-template-areas:"brand socials" "author socials";align-items:center;gap:5px 32px;border-top:1px solid var(--line);background:white}footer .brand{grid-area:brand}.footer-meta{grid-area:author;display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px}.footer-author{margin:0;color:var(--muted);font-size:12px}.footer-directory-links{display:inline-flex;flex-wrap:wrap;gap:10px;font-size:12px;font-weight:750}.footer-directory-links a{color:var(--blue)}.footer-directory-links a:hover{text-decoration:underline}.legal-page{min-height:100vh;background:var(--paper)}.legal-shell{width:min(860px,calc(100% - 32px));margin:0 auto;padding:72px 0 88px}.legal-shell h1{margin:8px 0 18px;font-size:clamp(42px,7vw,78px);line-height:.95;letter-spacing:-.05em}.legal-lead{margin:0 0 42px;color:var(--blue);font-size:clamp(18px,2vw,24px);font-weight:800}.legal-shell section{padding:24px 0;border-top:1px solid var(--line)}.legal-shell h2{margin:0 0 10px;font-size:20px}.legal-shell section p{max-width:72ch;margin:8px 0 0;color:var(--muted);line-height:1.65}.legal-shell a{color:var(--blue);font-weight:750}.social-links{grid-area:socials;display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}.social-links a{min-height:36px;padding:7px 10px;border:1px solid var(--line);border-radius:9px;color:var(--blue);font-size:12px;font-weight:750;transition:border-color .2s ease,background .2s ease}.social-links a:hover{border-color:var(--blue);background:#edf0ff}.social-links a{display:inline-flex;align-items:center;gap:7px}.social-links a span{color:var(--muted);font-weight:650}.social-links a b{font-weight:800}.support-email-link{min-width:0;display:inline-flex;align-items:center;gap:7px}.support-email-link b{overflow-wrap:anywhere}.learning-page{min-height:100vh;background:var(--paper)}.learning-notes-trigger{min-width:190px;min-height:58px;padding:7px 9px;display:grid;grid-template-columns:38px minmax(0,1fr) auto;align-items:center;gap:10px;position:fixed;left:126px;bottom:16px;z-index:63;border:1px solid var(--line);border-radius:14px;background:rgba(255,255,255,.96);color:var(--ink);box-shadow:0 16px 42px rgba(23,32,51,.16);text-align:left;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.learning-notes-trigger:hover{border-color:var(--blue);transform:translateY(-2px)}.learning-notes-trigger:disabled{cursor:wait;opacity:.58}.learning-notes-trigger>span:first-child{width:38px;height:38px;display:grid;place-items:center;border-radius:10px;background:var(--ink);color:var(--lime);font-size:24px;font-weight:700;line-height:1}.learning-notes-trigger>span:nth-child(2){min-width:0;display:grid;gap:1px}.learning-notes-trigger b{font-size:12px}.learning-notes-trigger small{overflow:hidden;color:var(--muted);font-size:12px;text-overflow:ellipsis;white-space:nowrap}.learning-notes-trigger>strong{min-width:26px;height:26px;padding:0 6px;display:grid;place-items:center;border-radius:999px;background:#edf2ff;color:var(--blue);font-size:12px}.learning-notes-trigger.has-notes{border-color:rgba(36,85,214,.34)}.learning-notes-backdrop{display:flex;position:fixed;inset:0;z-index:90;background:rgba(14,23,38,.38);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.learning-notes-panel{width:min(520px,calc(100% - 24px));height:100%;margin-left:auto;display:grid;grid-template-rows:auto minmax(0,1fr);overflow:hidden;background:var(--paper);box-shadow:-22px 0 70px rgba(14,23,38,.2)}.learning-notes-panel>header{padding:26px 24px 22px;display:flex;align-items:start;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line);background:white}.learning-notes-panel>header>div{min-width:0}.learning-notes-panel>header span{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.12em}.learning-notes-panel>header h2{margin:5px 0 0;font-size:34px;line-height:1;letter-spacing:-.045em}.learning-notes-panel>header p{margin:9px 0 0;color:var(--muted);font-size:12px}.learning-notes-panel>header button{width:42px;height:42px;padding:0;flex:0 0 auto;border:1px solid var(--line);border-radius:50%;background:white;color:var(--ink);font-size:25px;line-height:1}.learning-notes-panel>header button:hover{border-color:var(--blue);color:var(--blue)}.learning-notes-content{min-height:0;padding:18px;overflow-y:auto;overscroll-behavior:contain}.learning-notes-empty{min-height:100%;padding:48px 24px;display:grid;place-items:center;align-content:center;text-align:center}.learning-notes-empty>span{color:var(--blue);font-family:Georgia,serif;font-size:64px}.learning-notes-empty h3{margin:12px 0 0;font-size:22px}.learning-notes-empty p{max-width:330px;margin:8px 0 0;color:var(--muted);font-size:12px;line-height:1.55}.learning-notes-lesson+.learning-notes-lesson{margin-top:26px}.learning-notes-lesson>header{min-height:36px;padding:0 4px 9px;display:flex;align-items:center;justify-content:space-between;gap:12px}.learning-notes-lesson>header h3{margin:0;font-size:13px;letter-spacing:-.015em}.learning-notes-lesson>header span{min-width:24px;height:24px;padding:0 6px;display:grid;place-items:center;border-radius:999px;background:var(--ink);color:var(--lime);font-size:12px;font-weight:700}.learning-notes-lesson>div{display:grid;gap:8px}.learning-note-entry{padding:16px;border:1px solid var(--line);border-radius:12px;background:white;box-shadow:0 6px 18px rgba(23,32,51,.025)}.learning-note-entry>small{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.12em}.learning-note-entry h4{margin:5px 0 0;font-size:16px;letter-spacing:-.02em}.learning-note-entry p{margin:9px 0 0;color:var(--muted);font-size:12px;line-height:1.55}.learning-note-entry>span{margin-top:9px;display:block;color:var(--muted);font-size:12px;line-height:1.45}.learning-note-formula{width:100%;max-width:100%;margin-top:11px;padding:10px 12px;display:block;border-radius:8px;background:#f1f5ff;color:var(--blue)}.learning-note-formula .katex{font-size:17px}.learning-entry-loading{min-height:500px;display:grid;place-items:center;align-content:center;gap:13px;color:var(--muted)}.learning-entry-loading>span{color:var(--blue);font-family:Georgia,serif;font-size:62px}.learning-entry-loading p{margin:0;font-size:12px}.learning-entry-gate{min-height:520px;padding:clamp(48px,8vw,112px) max(20px,env(safe-area-inset-right)) clamp(60px,9vw,128px) max(20px,env(safe-area-inset-left));display:grid;justify-items:center;align-content:center;gap:16px;overflow:hidden;background:radial-gradient(circle at 75% 18%,rgba(216,255,87,.22),transparent 22%),#f5f3ed;text-align:center}.learning-entry-gate>span{width:62px;height:62px;display:grid;place-items:center;border:1px solid #b9c5e7;border-radius:50%;color:var(--blue);font-family:Georgia,serif;font-size:35px}.learning-entry-gate .eyebrow{margin:12px 0 0;color:var(--blue)}.learning-entry-gate h1{max-width:680px;margin:0;font-size:clamp(34px,5vw,58px);letter-spacing:-.05em;line-height:.98}.learning-entry-gate>p:not(.eyebrow){max-width:620px;margin:0;color:var(--muted);font-size:15px;line-height:1.65}.learning-entry-gate>div{width:min(100%,430px);display:grid;gap:12px}.learning-entry-gate a{min-height:52px;padding:12px 18px;display:grid;place-items:center;border-radius:9px;color:var(--blue);font-size:14px;font-weight:700}.learning-entry-gate .primary-action{background:var(--blue);color:white}.guest-diagnostic{min-height:630px;padding:clamp(34px,5vw,72px) clamp(18px,7vw,108px);display:grid;place-items:center;overflow:visible;background:radial-gradient(circle at 83% 18%,rgba(216,255,87,.18),transparent 24%),radial-gradient(circle at 12% 86%,rgba(49,87,226,.08),transparent 28%),#f5f3ed}.diagnostic-intro-card,.diagnostic-question-card,.diagnostic-result-card{width:min(920px,100%);border:1px solid #d9dfe8;border-radius:24px;background:rgba(255,255,255,.96);box-shadow:0 24px 70px rgba(23,32,51,.09)}.diagnostic-intro-card{min-height:500px;padding:clamp(30px,5vw,62px);display:grid;grid-template-columns:minmax(0,1.15fr) minmax(250px,.65fr);align-items:center;gap:clamp(30px,6vw,80px)}.diagnostic-intro-copy .eyebrow,.diagnostic-result-copy .eyebrow{color:var(--blue)}.diagnostic-intro-copy h1{margin:14px 0 20px;font-size:clamp(36px,5vw,60px);line-height:1.02;letter-spacing:-.05em}.diagnostic-intro-copy h1 em{color:var(--blue);font-family:Georgia,serif;font-weight:400}.diagnostic-intro-copy>p:not(.eyebrow){max-width:590px;margin:0;color:var(--muted);font-size:16px;line-height:1.6}.diagnostic-intro-copy>button{width:min(360px,100%);min-height:54px;margin-top:28px;padding:0 17px;display:flex;align-items:center;justify-content:space-between;gap:12px;border:0;border-radius:11px;background:var(--blue);color:white;cursor:pointer;font-size:16px;font-weight:700}.diagnostic-intro-copy>button:hover{background:var(--ink)}.diagnostic-intro-copy>button b{color:var(--lime);font-size:20px}.diagnostic-intro-copy>small{max-width:390px;margin-top:12px;display:block;color:#7a8491;font-size:12px;line-height:1.5}.diagnostic-intro-orbit{width:min(290px,27vw);aspect-ratio:1;display:grid;place-items:center;position:relative;border:1px solid #bdc8ed;border-radius:50%;color:var(--blue)}.diagnostic-intro-orbit:after,.diagnostic-intro-orbit:before{content:"";position:absolute;inset:14%;border:1px solid #d7def4;border-radius:50%;transform:rotate(52deg) scaleX(.46)}.diagnostic-intro-orbit:after{transform:rotate(-52deg) scaleX(.46)}.diagnostic-intro-orbit>span{font-family:Georgia,serif;font-size:clamp(72px,9vw,112px);line-height:1}.diagnostic-intro-orbit b,.diagnostic-intro-orbit i{width:42px;height:42px;display:grid;place-items:center;position:absolute;border-radius:50%;font-size:12px;font-style:normal}.diagnostic-intro-orbit i{top:4%;right:10%;background:var(--lime);color:var(--ink)}.diagnostic-intro-orbit b{left:1%;bottom:19%;background:var(--ink);color:white}.diagnostic-facts{margin:0;padding-top:24px;display:grid;grid-column:1/-1;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--line)}.diagnostic-facts>div{padding:0 20px;display:grid;gap:3px;border-right:1px solid var(--line)}.diagnostic-facts>div:first-child{padding-left:0}.diagnostic-facts>div:last-child{border-right:0}.diagnostic-facts dt{font-size:26px;font-weight:900;letter-spacing:-.04em}.diagnostic-facts dd{margin:0;color:var(--muted);font-size:13px;font-weight:700;letter-spacing:.02em}.diagnostic-question-card{width:min(760px,100%);padding:clamp(24px,4vw,42px)}.diagnostic-question-card>header{display:flex;align-items:center;justify-content:space-between;gap:18px}.diagnostic-question-card>header>div{display:grid;gap:5px}.diagnostic-question-card>header span{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.04em}.diagnostic-question-card>header b{color:var(--muted);font-size:14px}.diagnostic-question-card>header strong{color:var(--ink);font-size:15px}.diagnostic-progress{height:5px;margin-top:16px;overflow:hidden;border-radius:999px;background:#e7eaf0}.diagnostic-progress>span{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,var(--blue),#7189ee);transition:width .25s ease}.diagnostic-prompt{margin:clamp(25px,4vw,38px) 0 22px}.diagnostic-prompt p{margin:0;color:var(--ink);font-size:clamp(22px,3vw,31px);font-weight:800;line-height:1.22;letter-spacing:-.035em}.diagnostic-options{margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;border:0}.diagnostic-options label{min-height:76px;padding:13px 14px;display:grid;grid-template-columns:34px minmax(0,1fr);align-items:center;gap:11px;border:1.5px solid #d8dee8;border-radius:13px;background:#fbfcfe;cursor:pointer;transition:border-color .15s ease,background .15s ease,transform .15s ease}.diagnostic-options label:hover{border-color:#99a9e8;transform:translateY(-1px)}.diagnostic-options label.selected{border-color:var(--blue);background:#eef1ff;box-shadow:0 0 0 3px rgba(49,87,226,.08)}.diagnostic-options label.correct{border-color:#6e8b2c;background:#f0f6df;box-shadow:none}.diagnostic-options label.wrong{border-color:#bb6246;background:#fff1ec;box-shadow:none}.diagnostic-options input{width:1px;height:1px;position:absolute;overflow:hidden;opacity:0}.diagnostic-options label>span{width:34px;height:34px;display:grid;place-items:center;border-radius:9px;background:#e8ecf5;color:#516078;font-size:14px;font-weight:700}.diagnostic-options label.selected>span{background:var(--blue);color:white}.diagnostic-options label.correct>span{background:#6e8b2c;color:white}.diagnostic-options label.wrong>span{background:#bb6246;color:white}.diagnostic-options .latex-text p{margin:0;font-size:16px;font-weight:500;line-height:1.5}.diagnostic-feedback{margin-top:14px;padding:15px;display:grid;grid-template-columns:38px minmax(0,1fr);gap:12px;border-radius:13px}.diagnostic-feedback.correct{background:#eef5dc;color:#425b16}.diagnostic-feedback.wrong{background:#fff1ec;color:#7d3a28}.diagnostic-feedback>span{width:38px;height:38px;display:grid;place-items:center;border-radius:50%;color:white;font-size:17px;font-weight:900}.diagnostic-feedback.correct>span{background:#58751d}.diagnostic-feedback.wrong>span{background:#a94d34}.diagnostic-feedback>div{min-width:0;display:grid;gap:4px}.diagnostic-feedback b{font-size:15px;line-height:1.4}.diagnostic-expected-answer{margin:0;font-size:14px;line-height:1.5}.diagnostic-expected-answer .latex-text,.diagnostic-expected-answer .latex-text p{display:inline;margin:0;font-size:inherit}.diagnostic-feedback .latex-text p{margin:0;font-size:14px;line-height:1.55}.diagnostic-request-error{margin:12px 0 0;color:#8e3e2a;font-size:12px;font-weight:750;line-height:1.45}.diagnostic-next-action{width:100%;min-height:52px;margin-top:18px;padding:0 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;border:0;border-radius:10px;background:var(--ink);color:white;cursor:pointer;font-size:16px;font-weight:700}.diagnostic-next-action:hover{background:var(--blue)}.diagnostic-next-action:disabled{cursor:not-allowed;opacity:.45}.diagnostic-next-action b{color:var(--lime);font-size:19px}.diagnostic-result-card{width:min(900px,100%);padding:clamp(28px,5vw,54px);display:grid;grid-template-columns:150px minmax(0,1fr);align-items:center;gap:30px 38px}.diagnostic-score-ring{--diagnostic-score:0%;width:150px;aspect-ratio:1;display:grid;place-items:center;align-content:center;position:relative;border-radius:50%;background:conic-gradient(var(--blue) var(--diagnostic-score),#e8ebf1 0)}.diagnostic-score-ring:before{content:"";position:absolute;inset:11px;border-radius:inherit;background:white}.diagnostic-score-ring span,.diagnostic-score-ring strong{position:relative}.diagnostic-score-ring strong{font-size:45px;line-height:1;letter-spacing:-.06em}.diagnostic-score-ring span{margin-top:3px;color:var(--muted);font-size:12px;font-weight:700;text-transform:uppercase}.diagnostic-result-copy h1{margin:9px 0 6px;font-size:clamp(34px,5vw,56px);line-height:.98;letter-spacing:-.055em}.diagnostic-result-copy>b{color:var(--blue);font-size:12px}.diagnostic-result-copy>p:not(.eyebrow){max-width:620px;margin:13px 0 0;color:var(--muted);font-size:12px;line-height:1.65}.diagnostic-area-results{display:grid;grid-column:1/-1;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}.diagnostic-area-results>div{padding:12px;border:1px solid #e0e4eb;border-radius:11px;background:#fafbfc}.diagnostic-area-results>div>span{display:flex;align-items:center;justify-content:space-between;gap:8px}.diagnostic-area-results b{font-size:12px}.diagnostic-area-results small{color:var(--muted);font-size:12px;font-weight:700}.diagnostic-area-results i{height:4px;margin-top:9px;display:block;overflow:hidden;border-radius:99px;background:#e3e6ec}.diagnostic-area-results i span{height:100%;display:block;border-radius:inherit;background:var(--blue)}.diagnostic-insight-grid{display:grid;grid-column:1/-1;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.diagnostic-insight-grid>div{padding:15px 17px;display:grid;gap:4px;border-left:3px solid var(--lime);border-radius:0 10px 10px 0;background:#f3f1eb}.diagnostic-insight-grid span{color:var(--muted);font-size:12px;font-weight:700;letter-spacing:.02em}.diagnostic-insight-grid b{font-size:15px}.diagnostic-recommendation{padding:17px;display:grid;grid-column:1/-1;grid-template-columns:38px minmax(0,1fr);gap:12px;border-radius:13px;background:var(--ink);color:white}.diagnostic-recommendation>span{width:38px;height:38px;display:grid;place-items:center;border-radius:10px;background:var(--lime);color:var(--ink);font-size:18px;font-weight:900}.diagnostic-recommendation>div{display:grid;gap:7px}.diagnostic-recommendation p{margin:0;color:#c3ccd8;font-size:14px;line-height:1.55}.diagnostic-recommendation b{display:block;color:white;font-size:15px}.diagnostic-result-actions{display:flex;grid-column:1/-1;align-items:center;gap:12px}.diagnostic-result-actions>a{min-height:54px;padding:0 17px;display:flex;flex:1 1;align-items:center;justify-content:space-between;gap:12px;border-radius:10px;background:var(--blue);color:white;font-size:15px;font-weight:700}.diagnostic-result-actions>a:hover{background:var(--ink)}.diagnostic-result-actions>a b{color:var(--lime);font-size:19px}.diagnostic-result-actions>button{min-height:48px;padding:0 12px;border:0;background:transparent;color:var(--muted);cursor:pointer;font-size:14px;font-weight:700}.diagnostic-disclaimer{grid-column:1/-1;color:#6d7684;font-size:12px;line-height:1.5;text-align:center}.learning-guest-entry{min-height:650px;padding:clamp(58px,7vw,94px) clamp(22px,7vw,108px);display:grid;grid-template-columns:minmax(0,1.15fr) minmax(350px,.65fr);align-items:center;gap:clamp(50px,8vw,126px);border-top:1px solid var(--line);background:radial-gradient(circle at 83% 24%,rgba(216,255,87,.2),transparent 24%),linear-gradient(135deg,#f3f0e8,#e9edf8)}.learning-entry-copy h1{margin:0;font-size:clamp(52px,6.4vw,88px);line-height:.9;letter-spacing:-.06em}.learning-entry-copy h1 em{color:var(--blue);font-family:Georgia,serif;font-weight:400}.learning-entry-copy>p:not(.eyebrow){max-width:680px;margin:24px 0 0;color:var(--muted);font-size:15px;line-height:1.7}.learning-entry-steps{max-width:720px;margin:32px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid #c8c2b7;border-bottom:1px solid #c8c2b7;list-style:none}.learning-entry-steps li{min-height:116px;padding:18px 16px;display:grid;grid-template-columns:28px minmax(0,1fr);align-content:center;gap:10px;border-right:1px solid #c8c2b7}.learning-entry-steps li:first-child{padding-left:0}.learning-entry-steps li:last-child{border-right:0}.learning-entry-steps li>span{width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:var(--blue);color:white;font-size:12px;font-weight:700}.learning-entry-steps li div{display:grid;gap:4px}.learning-entry-steps b{font-size:12px}.learning-entry-steps small{color:var(--muted);font-size:12px;line-height:1.45}.learning-entry-actions{padding:28px;display:grid;border:1px solid #354252;border-radius:18px;background:var(--ink);color:white;box-shadow:0 24px 64px rgba(23,32,43,.18)}.learning-entry-actions>span{color:var(--lime);font-size:12px;font-weight:700;letter-spacing:.12em}.learning-entry-actions h2{margin:17px 0 9px;font-size:31px;letter-spacing:-.04em}.learning-entry-actions p{margin:0 0 25px;color:#aeb8c5;font-size:12px;line-height:1.6}.learning-entry-actions .primary-action{min-height:50px;background:var(--lime);color:var(--ink)}.learning-entry-actions .primary-action:hover{background:white}.guest-start-action{min-height:50px;margin-top:8px;padding:0 13px;display:flex;align-items:center;justify-content:space-between;border:1px solid #516071;border-radius:8px;background:transparent;color:white;cursor:pointer;font-size:12px;font-weight:700;text-align:left}.guest-start-action:hover{border-color:var(--lime);color:var(--lime)}.guest-start-action b{color:var(--lime);font-size:18px}.learning-entry-actions>small{margin-top:13px;color:#82909f;font-size:12px;line-height:1.5;text-align:center}.member-learning-hero{min-height:480px}.member-learning-hero .learning-hero-copy strong{color:var(--ink)}.learning-next-action{min-height:52px;margin-top:28px;padding:0 16px;display:inline-flex;align-items:center;justify-content:space-between;gap:28px;border:0;border-radius:9px;background:var(--ink);color:white;cursor:pointer;font-size:12px;font-weight:700}.learning-next-action:hover{background:var(--blue)}.learning-next-action span{color:var(--lime);font-size:18px}.guest-learning-status{margin:20px clamp(22px,7vw,108px);padding:16px 18px;display:flex;align-items:center;justify-content:space-between;gap:24px;border:1px solid #b9c98a;border-radius:12px;background:#f1f6e2}.guest-learning-status>div{display:grid;gap:4px}.guest-learning-status span{color:#5c741f;font-size:12px;font-weight:700;letter-spacing:.1em}.guest-learning-status b{font-size:14px}.guest-learning-status p{margin:0;color:var(--muted);font-size:12px;line-height:1.5;text-align:right}.guest-learning-status a{color:var(--blue);font-weight:850;text-decoration:underline;text-underline-offset:2px}.learning-coming-soon{min-height:670px;padding:clamp(72px,9vw,124px) clamp(22px,8vw,128px);display:grid;grid-template-columns:minmax(0,1.15fr) minmax(360px,.75fr);align-items:center;gap:clamp(52px,8vw,120px);position:relative;overflow:hidden;background:radial-gradient(circle at 82% 28%,rgba(216,255,87,.23),transparent 24%),linear-gradient(135deg,#f3f0e8,#e8ecf8)}.learning-coming-soon:after{content:"φ";position:absolute;right:-3vw;top:-140px;color:rgba(35,72,219,.045);font-family:Georgia,serif;font-size:clamp(430px,48vw,690px);line-height:1;pointer-events:none}.learning-coming-copy,.learning-release-card{position:relative;z-index:1}.learning-coming-copy h1{margin:0;font-size:clamp(58px,7.7vw,108px);line-height:.87;letter-spacing:-.06em}.learning-coming-copy h1 em{color:var(--blue);font-family:Georgia,serif;font-weight:400}.learning-coming-copy>p:not(.eyebrow){max-width:680px;margin:25px 0 0;color:var(--muted);font-size:15px;line-height:1.7}.learning-coming-copy .hero-action{margin:35px 0 0}.learning-release-card{padding:27px;border:1px solid #354252;border-radius:18px;background:rgba(23,32,43,.97);color:white;box-shadow:0 26px 70px rgba(23,32,43,.2)}.learning-release-card>p:first-child{margin:0 0 20px;color:var(--lime);font-size:12px;font-weight:700;letter-spacing:.12em}.release-card-row{min-height:82px;display:grid;grid-template-columns:34px minmax(0,1fr) auto;align-items:center;gap:13px;border-top:1px solid #354252}.release-card-row>span{color:#778493;font-size:12px}.release-card-row>div{display:grid;gap:4px}.release-card-row strong{font-size:15px}.release-card-row small{color:#97a3b1;font-size:12px;line-height:1.4}.release-card-row>b{padding:6px 8px;border-radius:999px;font-size:12px;text-transform:uppercase;letter-spacing:.06em}.release-card-row.ready>b{background:var(--lime);color:var(--ink)}.release-card-row.pending>b{border:1px solid #586676;color:#b6c0cb}.release-card-note{margin:20px 0 0;padding-top:18px;border-top:1px solid #354252;color:#97a3b1;font-size:12px;line-height:1.6}.learning-hero{min-height:520px;padding:clamp(72px,9vw,118px) clamp(22px,7vw,108px) 74px;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(360px,.8fr);align-items:center;gap:clamp(48px,7vw,106px);position:relative;overflow:hidden;border-bottom:1px solid var(--line);background:radial-gradient(circle at 78% 36%,rgba(216,255,87,.22),transparent 24%),linear-gradient(135deg,#f3f0e8,#eeece5 62%,#e7ebf7)}.learning-hero:before{content:"";position:absolute;inset:0;opacity:.28;background-image:linear-gradient(rgba(35,72,219,.08) 1px,transparent 0),linear-gradient(90deg,rgba(35,72,219,.08) 1px,transparent 0);background-size:42px 42px;-webkit-mask-image:linear-gradient(90deg,transparent,black 55%,black);mask-image:linear-gradient(90deg,transparent,black 55%,black);pointer-events:none}.learning-hero:after{content:"φ";position:absolute;right:2vw;top:-105px;color:rgba(35,72,219,.045);font-family:Georgia,serif;font-size:clamp(390px,43vw,610px);line-height:1;pointer-events:none}.learning-hero>div,.learning-hero>section{position:relative;z-index:1}.learning-hero h1{max-width:870px;margin:0;font-size:clamp(52px,6.8vw,96px);line-height:.9;letter-spacing:-.06em}.learning-hero h1 em{color:var(--blue);font-family:Georgia,serif;font-weight:400}.learning-hero-copy{max-width:680px;margin:28px 0 0;color:var(--muted);font-size:16px;line-height:1.7}.mastery-panel{padding:26px;border:1px solid #354252;border-radius:19px;background:rgba(23,32,43,.96);color:white;box-shadow:0 24px 64px rgba(23,32,43,.19)}.mastery-panel>header{min-height:92px;display:flex;align-items:center;justify-content:space-between;gap:24px}.mastery-panel>header>div:first-child{display:grid;gap:7px}.mastery-panel>header span{color:var(--lime);font-size:12px;font-weight:700;letter-spacing:.12em}.mastery-panel>header b{font-size:clamp(23px,2.4vw,34px);letter-spacing:-.035em}.mastery-orbit{width:78px;height:78px;display:grid;place-items:center;flex:0 0 auto;position:relative;border:1px solid #516071;border-radius:50%}.mastery-orbit:before{inset:8px -7px;border:1px solid rgba(216,255,87,.48);transform:rotate(58deg)}.mastery-orbit:after,.mastery-orbit:before{content:"";position:absolute;border-radius:50%}.mastery-orbit:after{width:8px;height:8px;right:2px;top:12px;background:var(--lime);box-shadow:0 0 16px rgba(216,255,87,.85)}.mastery-orbit span{color:white!important;font-size:28px!important;letter-spacing:0!important}.mastery-progress-copy{margin-top:24px;display:flex;justify-content:space-between;gap:18px;color:#aab6c4;font-size:12px}.mastery-progress-copy span{color:white;letter-spacing:0}.mastery-progress-copy b{font-weight:600}.mastery-progress{height:8px;margin-top:9px;overflow:hidden;border-radius:999px;background:#34404d}.mastery-progress>span{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,#9ec5ff,var(--lime));box-shadow:0 0 20px rgba(216,255,87,.35);transition:width .45s ease}.learning-overview{margin-top:22px;display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid #354252}.learning-overview div{min-height:78px;padding:16px 12px 0;display:grid;align-content:space-between;border-right:1px solid #354252}.learning-overview div:last-child{border-right:0}.learning-overview span{color:#8f9aa8;font-size:12px;font-weight:700;letter-spacing:.09em;text-transform:uppercase}.learning-overview strong{color:white;font-size:27px;line-height:1}.achievement-shelf{padding:30px clamp(22px,7vw,108px) 32px;border-bottom:1px solid var(--line);background:#fffefa}.achievement-shelf>header{display:flex;align-items:end;justify-content:space-between;gap:40px}.achievement-shelf h2{margin:0;font-size:clamp(30px,3.7vw,50px);letter-spacing:-.045em}.achievement-shelf-actions{max-width:420px;display:flex;align-items:center;justify-content:flex-end;gap:12px}.achievement-shelf-actions p{margin:0;color:var(--muted);font-size:12px;line-height:1.45;text-align:right}.achievement-shelf-actions button{min-height:44px;padding:0 13px;display:inline-flex;align-items:center;gap:18px;flex:0 0 auto;border:0;border-radius:9px;background:var(--blue);color:white;cursor:pointer;font-size:12px;font-weight:700;letter-spacing:.04em}.achievement-shelf-actions button b{color:var(--lime);font-size:19px}.achievement-list{margin-top:18px;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}.achievement-list article{min-height:112px;padding:11px;display:grid;grid-template-columns:32px 1fr;grid-template-rows:1fr auto;gap:9px;position:relative;overflow:hidden;border:1px solid #d9d4c9;border-radius:10px;background:#f5f2eb;color:#7a8390}.achievement-list article.earned{border-color:#a7bd68;background:linear-gradient(145deg,#f7fbe9,#edf4d3);color:var(--ink);box-shadow:0 10px 26px rgba(72,96,21,.08)}.achievement-symbol{width:32px;height:32px;display:grid;place-items:center;border:1px solid #c9c4b9;border-radius:50%;color:#8c9581;font-family:Georgia,serif;font-size:16px}.earned .achievement-symbol{border-color:#6e892b;background:#678522;color:white;font-family:inherit;font-weight:900}.achievement-copy{display:grid;align-content:start;gap:4px}.achievement-copy span{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.09em}.achievement-copy b{font-size:13px;line-height:1.25}.achievement-copy p{margin:0;font-size:12px;line-height:1.45}.achievement-progress{height:3px;grid-column:1/-1;overflow:hidden;border-radius:999px;background:#d9d4c9}.achievement-progress span{height:100%;display:block;border-radius:inherit;background:var(--blue);transition:width .4s ease}.earned .achievement-progress span{background:#678522}.achievement-total{margin-top:13px;display:block;color:var(--muted);font-size:12px;text-align:right}.learning-workspace{min-height:650px;display:grid;grid-template-columns:330px minmax(0,1fr);background:#e9e5dc}.learning-workspace.empty{display:block}.course-map{padding:32px 24px 112px;border-right:1px solid #394451;background:var(--ink);color:white}.mobile-course-map-close,.mobile-lesson-controls{display:none}.course-map-head{display:flex;align-items:center;justify-content:space-between}.course-map-head p{margin:0;color:#8f9aa8;font-size:12px;font-weight:700;letter-spacing:.12em}.course-map-head strong{color:var(--lime);font-size:18px}.course-progress-track{height:4px;margin:14px 0 34px;overflow:hidden;border-radius:999px;background:#34404d}.course-progress-track span{height:100%;display:block;border-radius:inherit;background:var(--lime);transition:width .25s ease}.course-track+.course-track{margin-top:30px}.course-track-title{display:grid;gap:3px;margin-bottom:18px}.course-track-title b{color:var(--lime);font-size:12px;text-transform:uppercase;letter-spacing:.09em}.course-track-title span{color:#b7c0cb;font-size:13px}.course-module+.course-module{margin-top:24px}.course-module h3{margin:0 0 9px;color:#f3f5f7;font-size:14px}.course-module>button{width:100%;padding:9px 8px;display:flex;align-items:center;gap:11px;border:0;border-radius:8px;background:transparent;color:#aab4c0;cursor:pointer;text-align:left;transition:transform .18s ease,background .18s ease,color .18s ease}.course-module>button.active,.course-module>button:hover{background:#26323f;color:white;transform:translateX(2px)}.course-module>button:disabled{cursor:not-allowed;opacity:.48}.course-module>button[data-locked=true]{opacity:.6}.course-module>button[data-locked=true]:hover{background:#26323f;color:white}.course-module>button i{width:30px;height:30px;display:grid;place-items:center;flex:0 0 auto;border:1px solid #465360;border-radius:50%;color:var(--lime);font-size:12px;font-style:normal}.course-module>button.completed i{border-color:var(--lime);background:var(--lime);color:var(--ink);box-shadow:0 0 16px rgba(216,255,87,.18)}.course-module>button.active i,.course-module>button.in_progress i{border-color:#86a0ff;background:var(--blue);color:white}.course-module>button span{min-width:0;display:grid;gap:3px}.course-module>button b{font-size:12px;font-weight:700;line-height:1.35;overflow-wrap:anywhere}.course-module>button small{color:#748191;font-size:12px;line-height:1.35}.course-lock-notice{margin:12px 0 18px;padding:10px 11px;position:sticky;top:0;z-index:2;border:1px solid #596775;border-radius:8px;background:#202b36;color:#eef2f6;box-shadow:0 7px 20px rgba(10,18,29,.18);font-size:12px;line-height:1.5}.learning-empty-state{min-height:650px;padding:74px clamp(22px,8vw,130px) 92px;position:relative;overflow:hidden}.learning-empty-mark{position:absolute;right:clamp(24px,8vw,120px);top:48px;width:86px;height:86px;display:grid;place-items:center;border:1px solid #c5bfb3;border-radius:50%;color:var(--blue);font-family:Georgia,serif;font-size:54px}.learning-empty-state h2{margin:0;max-width:720px;font-size:clamp(46px,6vw,82px);line-height:.92;letter-spacing:-.055em}.learning-empty-state h2 em{color:var(--blue);font-family:Georgia,serif;font-weight:400}.learning-empty-copy{max-width:650px;margin:28px 0 54px;color:var(--muted);font-size:16px;line-height:1.7}.learning-content-types{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid #c9c3b8;border-bottom:1px solid #c9c3b8}.learning-content-types>div{min-height:190px;padding:24px 28px;display:grid;align-content:start;gap:10px;border-right:1px solid #c9c3b8}.learning-content-types>div:first-child{padding-left:0}.learning-content-types>div:last-child{border-right:0}.learning-content-types span{color:var(--blue);font-size:12px;font-weight:700}.learning-content-types b{font-size:21px}.learning-content-types p{max-width:260px;margin:4px 0 0;color:var(--muted);font-size:12px;line-height:1.55}.learning-start-state,.lesson-stage{padding:64px clamp(28px,6vw,88px) 88px}.lesson-stage-empty{padding:0}.learning-start-state{display:grid;place-items:start;align-content:center}.learning-start-state h2,.lesson-stage h2{margin:0;font-size:clamp(38px,5vw,68px);letter-spacing:-.05em}.learning-start-state>p:not(.eyebrow){max-width:570px;color:var(--muted);line-height:1.65}.learning-content-card button,.learning-start-state button{padding:11px 14px;border:0;border-radius:8px;background:var(--ink);color:white;cursor:pointer;font-size:13px;font-weight:750}.mobile-lesson-deck{display:contents}.mobile-lesson-track{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.mobile-lesson-slide{display:contents}.learning-empty-state,.learning-start-state,.lesson-checkpoint-slide,.lesson-overview-slide,.lesson-practice-slide,.lesson-sequence-slide{grid-column:1/-1}.lesson-content-slide{min-width:0;margin-top:12px}.lesson-content-slide.formula-content-slide{grid-column:1/-1}.lesson-content-slide .learning-content-card{height:100%}.lesson-stage-head{display:flex;align-items:start;justify-content:space-between;gap:28px;padding-bottom:30px;border-bottom:1px solid #cbc5b9}.lesson-stage-head>div>p:last-child{max-width:680px;color:var(--muted);line-height:1.6}.lesson-stage-head>span{padding:7px 9px;border:1px solid #c8c1b5;border-radius:7px;color:var(--muted);font-size:12px;white-space:nowrap}.lesson-mission{margin-top:22px;padding:18px 19px;display:grid;grid-template-columns:44px minmax(0,1fr) auto;align-items:center;gap:15px;border:1px solid #b5c874;border-radius:13px;background:linear-gradient(110deg,#f7faeb,#eef3d9);box-shadow:0 12px 30px rgba(72,96,21,.07)}.mission-pulse{width:44px;height:44px;display:grid;place-items:center;border-radius:50%;background:var(--ink);color:var(--lime);font-size:21px;box-shadow:0 0 0 6px rgba(23,32,43,.06)}.mission-copy{display:grid;gap:3px}.mission-copy>span{color:#5a761d;font-size:12px;font-weight:700;letter-spacing:.11em}.mission-copy h3{margin:0;font-size:17px;letter-spacing:-.02em}.mission-copy p{margin:0;color:#63704b;font-size:12px;line-height:1.5}.lesson-mission>strong{padding:8px 10px;border-radius:999px;background:var(--ink);color:var(--lime);font-size:12px;white-space:nowrap}.lesson-route{margin-top:18px;padding:14px 16px 18px;display:grid;grid-template-columns:repeat(3,1fr);gap:9px;position:relative;border:1px solid #cbc5b9;border-radius:12px;background:rgba(255,254,250,.58)}.lesson-route>div:not(.lesson-route-meter){padding:7px;display:flex;align-items:center;gap:9px;border-radius:8px}.lesson-route i{width:27px;height:27px;display:grid;place-items:center;flex:0 0 auto;border:1px solid #c5beb2;border-radius:50%;color:#8a938f;font-size:12px;font-style:normal}.lesson-route span{display:grid;gap:1px}.lesson-route b{font-size:12px}.lesson-route small{color:var(--muted);font-size:12px}.lesson-route .done i{border-color:#668322;background:#668322;color:white}.lesson-route .done b{color:#506817}.lesson-route .current{background:#edf0ff}.lesson-route .current i{border-color:var(--blue);background:var(--blue);color:white}.lesson-route .locked{opacity:.46}.lesson-route-meter{height:4px;grid-column:1/-1;overflow:hidden;border-radius:999px;background:#d7d1c6}.lesson-route-meter span{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,var(--blue),#6a8cff);transition:width .4s ease}.lesson-content-grid{margin-top:24px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.learning-content-card{--kind:var(--blue);--kind-soft:#eef2ff;min-height:294px;padding:20px;display:flex;flex-direction:column;align-items:stretch;position:relative;overflow:hidden;border:1px solid #d5d0c7;border-radius:16px;background:#fffefa;box-shadow:0 8px 24px rgba(23,32,51,.035);transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease}.learning-content-card:before{content:"";width:72px;height:3px;position:absolute;top:0;left:20px;border-radius:0 0 999px 999px;background:var(--kind);opacity:.76}.learning-content-card.quantity-content-card{--kind:#087d70;--kind-soft:#eaf7f3}.learning-content-card.formula-content-card{--kind:#a54a18;--kind-soft:#fff2e9}.learning-content-card.opened{border-color:color-mix(in srgb,var(--kind) 40%,#d5d0c7);box-shadow:0 13px 34px rgba(23,32,51,.065)}.learning-content-label{width:100%;min-height:30px;display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--kind);font-size:12px;font-weight:700;letter-spacing:.08em;line-height:1.35;text-transform:uppercase}.learning-content-kind{display:inline-flex;align-items:center;gap:7px}.learning-kind-icon{width:25px;height:25px;display:block;position:relative;flex:0 0 auto;overflow:hidden;border:1px solid color-mix(in srgb,var(--kind) 18%,transparent);border-radius:8px;background:linear-gradient(145deg,color-mix(in srgb,var(--kind-soft) 78%,white),var(--kind-soft));color:var(--kind);box-shadow:inset 0 1px 0 rgba(255,255,255,.78),0 2px 5px color-mix(in srgb,var(--kind) 10%,transparent)}.learning-kind-icon>b,.learning-kind-icon>em,.learning-kind-icon>i{display:block;position:absolute;font-style:normal}.learning-kind-icon-concept>i{width:8px;height:8px;left:8px;top:8px;border-radius:50%;background:currentColor;box-shadow:0 0 0 3px color-mix(in srgb,currentColor 15%,transparent)}.learning-kind-icon-concept>b,.learning-kind-icon-concept>em{width:4px;height:4px;border:1px solid;border-radius:50%;opacity:.72}.learning-kind-icon-concept>b{left:3px;top:4px}.learning-kind-icon-concept>em{right:3px;bottom:4px}.learning-kind-icon-quantity>i{width:14px;height:3px;left:5px;top:11px;border-radius:999px;background:currentColor}.learning-kind-icon-quantity>b,.learning-kind-icon-quantity>em{width:2px;border-radius:999px;background:currentColor}.learning-kind-icon-quantity>b{height:10px;left:7px;top:7px;box-shadow:4px 3px 0 currentColor,8px 0 0 currentColor}.learning-kind-icon-quantity>em{width:3px;height:3px;right:3px;top:3px;border-radius:50%;opacity:.78}.learning-kind-icon-formula>em,.learning-kind-icon-formula>i{width:9px;height:3px;left:7px;border-radius:999px;background:currentColor;transform:skewX(-24deg)}.learning-kind-icon-formula>i{top:6px}.learning-kind-icon-formula>b{width:15px;height:2px;left:5px;top:11px;border-radius:999px;background:currentColor}.learning-kind-icon-formula>em{bottom:6px}.learning-content-label>b{padding:6px 8px;display:inline-flex;align-items:center;gap:4px;border-radius:999px;background:#eef5da;color:#536d17;font-size:12px;letter-spacing:.035em;text-align:right;white-space:nowrap}.learning-content-label>b span{font-size:12px}.learning-content-card h4{margin:17px 0 14px;font-size:clamp(22px,2.2vw,28px);line-height:1.08;letter-spacing:-.035em}.learning-content-card:not(.opened){min-height:212px}.learning-content-card button{margin-top:auto}.learning-content-card .content-open-action{width:100%;min-height:48px;padding:7px 7px 7px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--ink);font-size:12px;transition:transform .2s ease,background .2s ease,box-shadow .2s ease}.content-open-action>span{display:inline-flex;align-items:center;gap:8px}.content-open-action>span:after{content:"→";color:var(--lime);font-size:16px;line-height:1}.content-open-action small{padding:7px 8px;border-radius:7px;background:var(--lime);color:var(--ink);font-size:12px;font-weight:700;white-space:nowrap}.content-open-action:hover{background:var(--blue);box-shadow:0 8px 22px rgba(35,72,219,.18);transform:translateY(-1px)}.learning-card-sections{display:grid;gap:8px}.learning-card-section{padding:14px 15px;border:1px solid #ded9d0;border-radius:11px;background:white}.learning-card-links>span,.learning-card-section>span,.learning-formula-stage>span,.learning-quantity-hero span{display:block;color:var(--kind);font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase}.learning-card-section p{margin:6px 0 0;color:#454e57;font-family:var(--font-content);font-size:12px;line-height:1.58}.learning-card-section.insight{border-color:color-mix(in srgb,var(--kind) 20%,#ded9d0);background:var(--kind-soft)}.learning-card-section.insight p{color:var(--ink)}.learning-card-section.condition{border-color:#cbd69e;background:#f3f7e6}.learning-card-section.condition>span{color:#5c771b}.learning-card-links{margin-top:12px;display:grid;gap:7px}.learning-card-links>div{display:flex;flex-wrap:wrap;gap:5px}.learning-card-links b{padding:5px 7px;border:1px solid #ddd8ce;border-radius:999px;background:#faf8f3;color:#5e666e;font-size:12px;font-weight:750;line-height:1.3}.learning-quantity-hero{margin:1px 0 9px;display:grid;grid-template-columns:minmax(110px,.8fr) minmax(0,1.2fr);overflow:hidden;border:1px solid color-mix(in srgb,var(--kind) 22%,#ddd8ce);border-radius:12px;background:var(--kind-soft)}.learning-quantity-hero>div{min-width:0;min-height:94px;padding:14px;display:grid;align-content:center;gap:7px}.learning-quantity-hero>div+div{border-left:1px solid color-mix(in srgb,var(--kind) 18%,#ddd8ce);background:rgba(255,255,255,.56)}.learning-quantity-hero b{overflow-wrap:anywhere;font-size:12px;line-height:1.3}.learning-quantity-symbol{max-width:100%;color:var(--kind)}.learning-quantity-symbol .katex{font-size:25px}.learning-unit-formula{max-width:100%;color:#5f6b71}.learning-unit-formula .katex{font-size:12px}.learning-formula-stage{margin:1px 0 9px;padding:15px;display:grid;gap:9px;border:1px solid color-mix(in srgb,var(--kind) 22%,#ddd8ce);border-radius:12px;background:var(--kind-soft)}.learning-formula{max-width:100%;padding:7px 0;color:var(--kind)}.learning-formula .katex{font-size:21px}.learning-variable-guide{margin-top:10px;overflow:hidden;border:1px solid #d9d4cb;border-radius:11px;background:white}.learning-variable-guide summary{min-height:43px;padding:0 11px 0 14px;display:flex;align-items:center;justify-content:space-between;gap:12px;cursor:pointer;font-size:12px;font-weight:700;list-style:none}.learning-variable-guide summary::-webkit-details-marker{display:none}.learning-variable-guide summary:after{content:"+";color:var(--kind);font-size:16px;font-weight:500}.learning-variable-guide[open] summary:after{content:"−"}.learning-variable-guide summary:hover{background:var(--kind-soft)}.learning-variable-guide summary b{min-width:22px;height:22px;margin-left:auto;display:grid;place-items:center;border-radius:999px;background:var(--kind-soft);color:var(--kind);font-size:12px}.learning-variable-guide dl{margin:0;padding:4px 10px 10px;display:grid;gap:5px;border-top:1px solid #e4e0d8}.learning-variable-guide dl>div{min-height:46px;padding:6px 4px;display:grid;grid-template-columns:54px minmax(0,1fr);align-items:center;gap:10px;border-bottom:1px solid #eeeae3}.learning-variable-guide dl>div:last-child{border-bottom:0}.learning-variable-guide dd,.learning-variable-guide dt{min-width:0;margin:0}.learning-variable-guide dt{color:var(--kind);font-size:12px}.learning-variable-guide dd{display:grid;gap:2px}.learning-variable-guide dd b{font-family:var(--font-formula);font-size:12px}.learning-variable-guide dd span{color:var(--muted);font-size:12px;line-height:1.35}.lesson-activities{margin-top:26px;display:grid;gap:12px}.knowledge-checkpoint{padding:24px;overflow:hidden;border:1px solid #354252;border-radius:16px;background:var(--ink);color:white;box-shadow:0 18px 42px rgba(23,32,43,.12)}.knowledge-checkpoint.completed{border-color:#718b35;background:linear-gradient(145deg,#1f2b24,#17202b 64%)}.checkpoint-head{display:flex;align-items:start;justify-content:space-between;gap:28px}.checkpoint-head .eyebrow{margin-bottom:9px;color:var(--lime);font-size:12px}.checkpoint-head h3{margin:0;font-size:clamp(23px,3vw,34px);letter-spacing:-.035em}.checkpoint-head>div>p:last-child{max-width:680px;margin:9px 0 0;color:#aeb8c5;font-size:12px;line-height:1.6}.checkpoint-head>strong{min-width:66px;padding:11px 12px;border:1px solid #465360;border-radius:10px;font-size:20px;text-align:center}.checkpoint-progress{height:7px;margin-top:20px;overflow:hidden;border-radius:999px;background:#34404d}.checkpoint-progress>span{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,#86a0ff,var(--lime));box-shadow:0 0 18px rgba(216,255,87,.25);transition:width .4s ease}.checkpoint-map{margin-top:15px;display:flex;flex-wrap:wrap;gap:7px}.checkpoint-map i{width:28px;height:28px;display:grid;place-items:center;border:1px solid #465360;border-radius:50%;color:#758190;font-size:12px;font-style:normal}.checkpoint-map i.current{border-color:#86a0ff;background:var(--blue);color:white;box-shadow:0 0 0 4px rgba(134,160,255,.12)}.checkpoint-map i.done{border-color:var(--lime);background:var(--lime);color:var(--ink);font-size:12px;font-weight:700}.checkpoint-rules{margin-top:17px;padding:11px 0 18px;display:flex;flex-wrap:wrap;gap:7px;border-bottom:1px solid #354252}.checkpoint-rules b,.checkpoint-rules span{padding:6px 8px;border:1px solid #465360;border-radius:999px;color:#aeb8c5;font-family:var(--font-formula);font-size:12px;font-weight:750}.checkpoint-rules b{margin-left:auto;border-color:#70843d;color:var(--lime)}.knowledge-checkpoint .learning-activity{margin-top:18px;border:0;background:#f6f3eb;color:var(--ink)}.checkpoint-reward{margin-top:18px;padding:14px 16px;display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:13px;border:1px solid #7e9841;border-radius:11px;background:rgba(216,255,87,.1);animation:reward-pop .55s cubic-bezier(.2,.9,.2,1)}.checkpoint-reward>span{min-width:52px;padding:8px 9px;border-radius:999px;background:var(--lime);color:var(--ink);font-size:12px;font-weight:700;text-align:center}.checkpoint-reward>div{display:grid;gap:3px}.checkpoint-reward b{color:var(--lime);font-size:12px}.checkpoint-reward p{margin:0;color:#c6cfda;font-size:12px;line-height:1.5}.checkpoint-complete{margin-top:20px;padding:18px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:14px;border:1px solid #728b37;border-radius:12px;background:rgba(216,255,87,.1);animation:reward-pop .55s cubic-bezier(.2,.9,.2,1)}.checkpoint-complete>span{width:38px;height:38px;display:grid;place-items:center;border-radius:50%;background:var(--lime);color:var(--ink);font-weight:900}.checkpoint-complete>div{display:grid;gap:3px}.checkpoint-complete b{color:white;font-size:13px}.checkpoint-complete p{margin:0;color:#b7c2ce;font-size:12px}.checkpoint-complete>strong{padding:8px 10px;border-radius:999px;background:var(--lime);color:var(--ink);font-size:12px;white-space:nowrap}.checkpoint-complete>.checkpoint-complete-actions{grid-column:2/-1;display:flex;align-items:stretch;gap:8px}.checkpoint-complete-actions a,.checkpoint-complete-actions button{min-height:46px;padding:10px 14px;display:flex;align-items:center;justify-content:center;border-radius:8px;cursor:pointer;font-size:12px;font-weight:700;text-align:left}.checkpoint-complete-actions button{min-width:210px;flex:1 1;flex-direction:column;align-items:flex-start;border:0;background:var(--lime);color:var(--ink)}.checkpoint-complete-actions button small{margin-top:2px;font-size:12px;font-weight:650;line-height:1.35;opacity:.72}.checkpoint-complete-actions a{border:1px solid #71843e;color:white}.checkpoint-complete-actions button:hover{background:white}.checkpoint-complete-actions a:hover{border-color:var(--lime);color:var(--lime)}.checkpoint-complete-actions .checkpoint-achievements-link{min-width:0;flex:0 0 auto;border:1px solid #71843e;background:transparent;color:white}.checkpoint-complete-actions .checkpoint-achievements-link:hover{border-color:var(--lime);background:transparent;color:var(--lime)}.lesson-completion-summary{margin-top:30px;padding:22px;border:1px solid #c9d4a3;border-radius:16px;background:linear-gradient(145deg,#f8fbe9,#fffefa 58%);box-shadow:0 12px 30px rgba(72,96,21,.07)}.lesson-completion-summary>header{display:flex;align-items:start;justify-content:space-between;gap:18px}.lesson-completion-summary .eyebrow{margin:0;color:#5a761d;font-size:12px}.lesson-completion-summary h3{margin:7px 0 0;font-size:22px;letter-spacing:-.03em}.lesson-completion-summary header p:last-child{max-width:640px;margin:8px 0 0;color:#66705b;font-size:13px;line-height:1.55}.lesson-completion-summary>header>strong{padding:7px 9px;border-radius:999px;background:#e7f0c7;color:#4f6b14;font-size:12px;white-space:nowrap}.lesson-outline-list{margin:18px 0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;list-style:none}.lesson-outline-list>li{min-height:58px;padding:10px;display:flex;align-items:center;gap:10px;border:1px solid #dcd8cf;border-radius:10px;background:rgba(255,255,255,.72);color:#727a81}.lesson-outline-list>li.done{border-color:#b8ca82;color:var(--ink)}.lesson-outline-list i{width:25px;height:25px;display:grid;place-items:center;flex:0 0 auto;border:1px solid #c5beb2;border-radius:50%;color:#8a938f;font-size:12px;font-style:normal;font-weight:700}.lesson-outline-list .done i{border-color:#668322;background:#668322;color:white}.lesson-outline-list span{min-width:0;display:grid;gap:2px}.lesson-outline-list b{overflow:hidden;font-size:12px;line-height:1.35;text-overflow:ellipsis;white-space:nowrap}.lesson-outline-list small{color:#77806f;font-size:12px}.lesson-continue-button{width:100%;min-height:66px;padding:11px 13px 11px 16px;display:flex;align-items:center;justify-content:space-between;gap:16px;border:0;border-radius:12px;background:var(--ink);color:white;cursor:pointer;text-align:left;transition:background .18s ease,box-shadow .18s ease,transform .18s ease}.lesson-continue-button:hover:not(:disabled){background:var(--blue);box-shadow:0 10px 25px rgba(35,72,219,.2);transform:translateY(-1px)}.lesson-continue-button:disabled{background:#777c7e;color:#e9ece4;cursor:not-allowed}.lesson-continue-button>span{min-width:0;display:grid;gap:2px}.lesson-continue-button small{color:#aab6c2;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.lesson-continue-button b{font-size:16px}.lesson-continue-button em{overflow:hidden;color:var(--lime);font-size:12px;font-style:normal;text-overflow:ellipsis;white-space:nowrap}.lesson-continue-button>i{width:34px;height:34px;display:grid;place-items:center;flex:0 0 auto;border-radius:50%;background:var(--lime);color:var(--ink);font-size:19px;font-style:normal}.lesson-continue-button:disabled>i{background:#d9ded6;color:#6c7477}.lesson-course-complete{margin:18px 0 0;padding:13px;border:1px solid #b8ca82;border-radius:10px;background:#eef5d9;color:#506817;font-size:13px;font-weight:700;text-align:center}.lesson-check-locked{margin:24px 0 0;padding:14px 16px;border:1px dashed #c8c1b5;border-radius:10px;color:var(--muted);font-size:12px}.lesson-hidden-count{margin:14px 0 0;color:var(--muted);font-size:12px}.learning-activity{padding:24px;border:1px solid #c9c2b6;border-radius:13px;background:#f6f3eb}.learning-activity.completed{border-color:#9eb95b;background:#f4f8e9}.learning-activity-head{display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.09em;line-height:1.35}.learning-activity-head b{flex:0 0 auto;color:#557015;text-align:right}.learning-activity h3{max-width:780px;margin:16px 0 18px;font-size:18px;line-height:1.4}.learning-options{display:grid;gap:7px}.learning-options label{padding:11px 12px;display:flex;align-items:center;gap:10px;border:1px solid #d8d2c7;border-radius:8px;background:rgba(255,255,255,.58);color:#4f5967;cursor:pointer;font-size:12px}.learning-options label.selected{background:#eef1ff;color:var(--ink)}.learning-options input{accent-color:var(--blue)}.learning-activity>button{margin-top:16px;padding:10px 13px;border:0;border-radius:8px;background:var(--ink);color:white;cursor:pointer;font-size:12px;font-weight:750}.learning-activity>button:disabled{cursor:not-allowed;opacity:.45}.learning-feedback{margin:15px 0 0;padding:10px 12px;border-radius:8px;font-size:12px;line-height:1.5}.learning-feedback.correct{background:#e7f1ce;color:#4b6414}.learning-feedback.wrong{background:#fff0e9;color:#8a3c25}.lesson-problems{margin-top:54px;padding-top:38px;border-top:1px solid #c7c0b4}.lesson-problems>header{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:20px}.lesson-problems>header h3{margin:3px 0 0;font-size:clamp(30px,4vw,46px);letter-spacing:-.045em}.lesson-problems>header>span{padding:8px 10px;border:1px solid #c5beb2;border-radius:8px;color:var(--blue);font-size:12px;font-weight:700;white-space:nowrap}.problems-locked-message{margin:0;padding:16px 18px;border-left:3px solid #b8c76a;background:#f2f3e8;color:#59636f;line-height:1.6}.problems-loading-message{margin:0;padding:16px 18px;display:flex;align-items:center;gap:9px;border:1px solid #dce4f0;border-radius:10px;background:#f8fbff;color:#59636f}.problems-loading-message:before{width:13px;height:13px;flex:0 0 13px;border:2px solid #d6e0ef;border-top:2px solid var(--blue);border-radius:50%;content:"";animation:math-formula-loading .7s linear infinite}.problem-list{display:grid;gap:10px}.learning-problem{border:1px solid #c8c1b5;border-radius:12px;background:#f8f5ee;overflow:hidden}.learning-problem.solved{border-color:#9eb95b;background:#f5f8ec}.learning-problem>summary{padding:16px 18px;display:flex;align-items:center;justify-content:space-between;gap:18px;cursor:pointer;list-style:none}.learning-problem>summary::-webkit-details-marker{display:none}.learning-problem>summary span{display:grid;gap:4px}.learning-problem>summary b{font-size:16px}.learning-problem>summary small{color:var(--muted);font-size:12px;line-height:1.4}.learning-problem>summary strong{color:var(--blue);font-size:12px;letter-spacing:.08em;text-transform:uppercase}.learning-problem.solved>summary strong{color:#587318}.problem-body{padding:0 18px 20px;border-top:1px solid #d8d1c5}.problem-condition{margin-top:18px;padding:clamp(18px,3vw,28px);border:1px solid #d8d1c5;border-radius:12px;background:#fffefa}.problem-condition>span{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase}.problem-condition .latex-text{margin-top:14px;color:var(--ink);font-size:clamp(15px,2vw,18px);line-height:1.72}.problem-condition .latex-text p{margin:0}.problem-condition .latex-text p+p{margin-top:12px}.latex-inline{margin:0 .12em}.latex-display{width:100%;margin:13px 0;display:block;text-align:center}.problem-attempt{margin-top:18px;padding:20px;border-radius:10px;background:#ebe7de}.problem-attempt h4{margin:0;font-size:19px}.problem-answer-heading{display:flex;align-items:start;justify-content:space-between;gap:24px}.problem-answer-heading p{max-width:620px;margin:7px 0 0;color:var(--muted);font-size:12px;line-height:1.55}.problem-answer-heading>strong{padding:8px 10px;border-radius:999px;background:var(--blue);color:white;font-size:12px;white-space:nowrap}.problem-options{margin:18px 0;display:grid;grid-template-columns:minmax(0,1fr);gap:9px}.problem-options label{min-height:58px;padding:11px 13px;display:grid;grid-template-columns:auto auto minmax(0,1fr) auto;align-items:center;gap:11px;border:1px solid #cec7bb;border-radius:10px;background:rgba(255,255,255,.75);cursor:pointer;transition:border-color .16s ease,background .16s ease,transform .16s ease}.problem-options label:hover{border-color:var(--blue);transform:translateY(-1px)}.problem-options label:has(input:checked){border-color:var(--blue);background:#eef1ff;box-shadow:0 0 0 2px rgba(35,72,219,.08)}.problem-options label.failed{border-color:#e0b29e;background:#fff1eb;cursor:not-allowed;color:#88432d}.problem-options label.correct{border-color:#9eb95b;background:#edf5da;color:#4b6414}.problem-options input{width:16px;height:16px;accent-color:var(--blue)}.problem-options .math-formula{min-width:0;font-size:16px}.problem-options small{color:inherit;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.problem-option-letter{width:27px;height:27px;display:grid;place-items:center;border-radius:50%;background:#e5e0d6;color:var(--ink);font-size:12px;font-weight:700}.problem-options label:has(input:checked) .problem-option-letter{background:var(--blue);color:white}.problem-options label.correct .problem-option-letter{background:#678522;color:white}.problem-attempt>button{padding:11px 14px;border:0;border-radius:8px;background:var(--ink);color:white;cursor:pointer;font-size:12px;font-weight:700}.problem-attempt>button:disabled{cursor:not-allowed;opacity:.4}.problem-message{margin:13px 0 0;color:#8a3c25;font-size:12px;line-height:1.55}.problem-result{margin-top:18px}.problem-success{padding:15px 17px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:13px;position:relative;overflow:hidden;border:1px solid #b8ca81;border-radius:10px;background:#e8f0d4;color:#486015}.problem-success>span{width:29px;height:29px;display:grid;place-items:center;border-radius:50%;background:#678522;color:white;font-weight:900}.problem-success p{margin:3px 0 0;font-size:12px;line-height:1.5}.problem-success>strong{padding:8px 9px;border-radius:999px;background:#678522;color:white;font-size:12px;white-space:nowrap}.problem-success.celebrate{animation:reward-pop .65s cubic-bezier(.2,.9,.2,1)}.problem-success.celebrate:after,.problem-success.celebrate:before{content:"✦";position:absolute;color:#678522;font-size:15px;animation:spark-flight .9s ease-out both}.problem-success.celebrate:before{right:23%;top:8px}.problem-success.celebrate:after{right:8%;bottom:7px;animation-delay:.1s}.problem-history{margin-top:12px;padding:13px 15px;border:1px solid #d4cfc4;border-radius:9px;background:rgba(255,255,255,.58)}.problem-history summary{cursor:pointer;color:var(--blue);font-size:12px;font-weight:700}.problem-history ol{margin:13px 0 0;padding:0;display:grid;gap:7px;list-style:none}.problem-history li{padding:9px 10px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:12px;border-radius:7px;background:#fff1eb;color:#7d4634;font-size:12px}.problem-history li>span{font-weight:850}.problem-history time{color:var(--muted);white-space:nowrap}.sync-indicator{width:max-content;max-width:100%;margin:18px 0 0!important;padding:8px 11px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.45);font-size:12px!important}.sync-indicator a{color:var(--blue);font-weight:800;text-decoration:underline;text-underline-offset:2px}.sync-indicator.saved{border-color:#a6bd6e;color:#4e6815!important}.sync-indicator.offline{border-color:#dbac91;color:#864128!important}@keyframes reward-pop{0%{transform:scale(.96);opacity:.45}55%{transform:scale(1.018)}to{transform:scale(1);opacity:1}}@keyframes spark-flight{0%{transform:translateY(8px) scale(.5) rotate(0);opacity:0}40%{opacity:1}to{transform:translateY(-18px) scale(1.25) rotate(35deg);opacity:0}}.account-page,.owner-page,.teacher-page{min-height:100vh;background:var(--paper)}.account-shell{min-height:640px;padding:clamp(58px,7vw,96px) clamp(22px,8vw,128px);display:grid;grid-template-columns:minmax(0,1fr) minmax(340px,480px);gap:clamp(48px,8vw,118px);align-items:center}.account-intro h1,.teacher-heading h1{margin:0;font-size:clamp(46px,6vw,76px);line-height:.96;letter-spacing:-.055em}.account-intro h1 em{color:var(--blue);font-family:Georgia,serif;font-weight:400}.account-intro>p:last-of-type{max-width:560px;margin:22px 0 0;color:var(--muted);font-size:14px;line-height:1.65}.account-card{padding:30px;border:1px solid var(--line);border-radius:18px;background:var(--card);box-shadow:0 14px 40px rgba(23,32,51,.06)}.account-tabs{margin:-6px -6px 24px;padding:5px;display:grid;grid-template-columns:1fr 1fr;border-radius:10px;background:#ece8df}.account-tabs button{padding:10px;border:0;border-radius:7px;background:transparent;color:var(--muted);cursor:pointer;font-size:12px;font-weight:700}.account-tabs button.active{background:var(--card);color:var(--ink);box-shadow:0 3px 12px rgba(23,32,43,.07)}.account-card-heading{margin-bottom:24px}.account-card-heading span{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.12em}.account-card-heading h2{margin:8px 0 0;font-size:24px;letter-spacing:-.03em}.account-card form,.create-group,.setting-card form{display:grid;gap:14px}.account-card label,.create-group label{display:grid;gap:7px;color:var(--muted);font-size:12px;font-weight:750}.account-card input,.create-group input,.setting-card input{width:100%;min-height:44px;padding:10px 12px;border:1px solid #cfc8bc;border-radius:8px;background:#fffefa;color:var(--ink);outline:none}.account-card input:focus,.create-group input:focus,.setting-card input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(35,72,219,.1)}.account-card small{color:var(--muted);font-size:12px;line-height:1.5}.account-recovery-offer{margin-top:12px;padding:13px 14px;display:flex;align-items:center;justify-content:space-between;gap:14px;border:1px solid #cbd5fb;border-radius:10px;background:#f2f5ff}.account-recovery-offer>div:not(.account-recovery-actions){min-width:0;display:grid;gap:2px}.account-recovery-offer b{font-size:12px;line-height:1.4}.account-recovery-offer p{margin:0;color:var(--muted);font-size:12px;line-height:1.45}.account-recovery-offer button{min-height:36px;padding:7px 10px;border:1px solid var(--blue);border-radius:7px;background:var(--blue);color:white;cursor:pointer;font-size:12px;font-weight:700;white-space:nowrap}.account-recovery-offer button:hover{background:var(--ink);border-color:var(--ink)}.account-recovery-actions{display:flex;gap:6px}.account-recovery-actions button:first-child{background:white;color:var(--blue)}.account-consents{display:grid;gap:9px;padding:11px 0 2px;border-top:1px solid var(--line)}.account-consents label{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:start;gap:9px;color:var(--muted);font-size:12px;font-weight:650;line-height:1.45}.account-consents input[type=checkbox],.account-delete-form input[type=checkbox]{width:16px;min-height:16px;margin:1px 0 0;padding:0;accent-color:var(--blue);box-shadow:none}.account-consents a{color:var(--blue);text-decoration:underline;text-underline-offset:2px}.account-consents>small{margin-left:25px}.primary-action,button.primary-action{min-height:44px;padding:12px 16px;display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:8px;background:var(--ink);color:white;cursor:pointer;font-size:12px;font-weight:700}.primary-action:hover{background:var(--blue)}.primary-action:disabled{cursor:wait;opacity:.6}.secondary-action{padding:11px 15px;border:1px solid var(--blue);border-radius:8px;color:var(--blue);font-size:12px;font-weight:700}.text-action{padding:10px 4px;border:0;background:transparent;color:var(--muted);cursor:pointer;font-size:12px}.form-message{margin:16px 0 0;padding:10px 12px;border-radius:8px;background:#eef1ff;color:#294197;font-size:12px;line-height:1.5}.verification-card{position:relative;overflow:hidden}.verification-card:before{content:"";width:190px;height:190px;position:absolute;right:-105px;top:-105px;border-radius:50%;background:rgba(216,255,87,.5);pointer-events:none}.verification-mark{width:54px;height:54px;margin-bottom:24px;display:grid;place-items:center;position:relative;border-radius:50%;background:var(--ink);color:var(--lime);font-family:Georgia,serif;font-size:28px}.verification-card .eyebrow{margin-bottom:10px}.verification-card h2{margin:0;font-size:clamp(28px,4vw,38px);letter-spacing:-.04em}.verification-address{margin:13px 0 0;color:var(--muted);font-size:12px;line-height:1.6}.verification-address strong{display:block;color:var(--ink);font-size:14px;overflow-wrap:anywhere}.account-diagnostic-result{margin:18px 0;padding:14px;display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:12px;border:1px solid #cbd4f4;border-radius:11px;background:#f0f3ff;color:#243d9c}.account-diagnostic-result>span{width:42px;height:42px;display:grid;place-items:center;border-radius:50%;background:var(--blue);color:white;font-size:15px;font-weight:900}.account-diagnostic-result>div{display:grid;gap:3px}.account-diagnostic-result small{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.08em}.account-diagnostic-result b{color:var(--ink);font-size:12px}.account-diagnostic-result p{margin:0;color:var(--muted);font-size:12px;line-height:1.5}.verification-steps{margin:26px 0 20px;padding:0;display:grid;gap:15px;list-style:none}.verification-steps li{display:grid;grid-template-columns:30px minmax(0,1fr);gap:11px;align-items:start}.verification-steps li>div{min-width:0}.verification-steps li>span{width:30px;height:30px;display:grid;place-items:center;border:1px solid #c9d2f5;border-radius:50%;background:#f1f4ff;color:var(--blue);font-size:12px;font-weight:700}.verification-steps b{font-size:12px}.verification-steps p{margin:4px 0 0;color:var(--muted);font-size:12px;line-height:1.5}.verification-wait{margin-bottom:16px;padding:11px 12px;display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;border-radius:9px;background:#f0ede5}.verification-wait i{width:9px;height:9px;margin-top:4px;border-radius:50%;background:#56a269;box-shadow:0 0 0 5px rgba(86,162,105,.12)}.verification-wait p{min-width:0;margin:0;display:grid;gap:3px;color:var(--muted);font-size:12px;line-height:1.5}.verification-wait b{color:var(--ink);font-size:12px;line-height:1.35}.verification-wait span{overflow-wrap:anywhere}.verification-card>.primary-action{width:100%}.verification-actions{margin-top:9px;display:grid;grid-template-columns:1fr 1fr;gap:5px}.verification-actions .text-action{min-height:42px;border-radius:7px;font-size:12px}.verification-actions .text-action:hover{background:#f0ede5;color:var(--ink)}.account-shell.signed-in{align-items:start}.account-actions{margin-top:32px;display:flex;flex-wrap:wrap;gap:9px;align-items:center}.account-actions .account-continue-action{min-height:54px;padding-inline:20px;gap:26px;background:var(--lime);color:var(--ink);box-shadow:0 12px 30px rgba(112,145,31,.22)}.account-actions .account-continue-action:hover{background:var(--blue);color:white}.account-continue-action span{font-size:18px}.account-settings{display:grid;gap:12px}.account-settings>.form-message{margin:0}.setting-card{padding:24px;border:1px solid var(--line);border-radius:14px;background:var(--card)}.setting-card>span{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.09em}.setting-card h2{margin:13px 0 8px;font-size:23px}.setting-card p{color:var(--muted);font-size:12px;line-height:1.55}.setting-card>p{margin:0}.setting-card>p+form{margin-top:14px}.account-support-email{width:100%;min-height:48px;margin-top:14px;padding:10px 12px;justify-content:space-between;border-radius:8px;background:var(--ink);color:white;font-size:12px;font-weight:700}.account-support-email span{color:#b7c2ce}.account-support-email b{color:var(--lime);font-size:12px;text-align:right}.account-support-email:hover{background:var(--blue)}.account-achievements{scroll-margin-top:88px}.account-progress-summary{margin-top:18px;display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:10px;overflow:hidden}.account-progress-summary>div{min-width:0;padding:12px 5px;display:grid;gap:3px;text-align:center;border-right:1px solid var(--line)}.account-progress-summary>div:last-child{border-right:0}.account-progress-summary strong{font-size:18px}.account-progress-summary small{color:var(--muted);font-size:12px}.account-level-progress{height:7px;margin-top:15px;overflow:hidden;border-radius:999px;background:#e2ded5}.account-level-progress span{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,var(--blue),#789730)}.account-level-progress+p{margin-top:8px}.account-achievement-list{margin-top:17px;display:grid;gap:7px}.account-achievement-details{margin-top:16px}.account-achievement-details>summary{min-height:42px;padding:0 12px;display:flex;align-items:center;justify-content:space-between;list-style:none;border:1px solid var(--line);border-radius:9px;color:var(--blue);font-size:12px;font-weight:700}.account-achievement-details>summary::-webkit-details-marker{display:none}.account-achievement-details>summary span{color:var(--muted);font-size:12px}.account-achievement-details[open]>summary{background:#f1f5ff}.account-more-settings{overflow:hidden;border:1px solid var(--line);border-radius:14px;background:white}.account-more-settings>summary{min-height:62px;padding:0 18px;display:grid;align-content:center;gap:2px;list-style:none;color:var(--ink);font-size:13px;font-weight:700}.account-more-settings>summary::-webkit-details-marker{display:none}.account-more-settings>summary:after{content:"+";grid-column:2;grid-row:1/span 2;align-self:center;color:var(--blue);font-size:22px;font-weight:500}.account-more-settings[open]>summary:after{content:"−"}.account-more-settings>summary span{color:var(--muted);font-size:12px;font-weight:650}.account-more-settings>div{padding:0 10px 10px;display:grid;gap:10px;border-top:1px solid var(--line)}.account-more-settings>div>.setting-card{border-radius:11px;box-shadow:none}.account-achievement-list>div{min-height:52px;padding:8px 10px;display:grid;grid-template-columns:32px minmax(0,1fr) auto;align-items:center;gap:9px;border:1px solid var(--line);border-radius:9px;background:#f6f3ec}.account-achievement-list>div.earned{border-color:#a9bd72;background:#f3f7e8}.account-achievement-list i{width:32px;height:32px;display:grid;place-items:center;border-radius:50%;background:#e2ded5;color:var(--muted);font-size:12px;font-style:normal;font-weight:700}.account-achievement-list .earned i{background:#d8ff57;color:var(--ink)}.account-achievement-list span{min-width:0;display:grid;gap:2px}.account-achievement-list b{font-size:12px}.account-achievement-list small{color:var(--muted);font-size:12px;line-height:1.35}.account-achievement-list>div>strong{color:var(--blue);font-size:12px;text-transform:uppercase}.grade-choice{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:16px}.create-group button,.grade-choice button,.inline-form button{min-height:41px;padding:9px 12px;border:1px solid var(--ink);border-radius:8px;background:transparent;color:var(--ink);cursor:pointer;font-size:12px;font-weight:700}.create-group button:hover,.grade-choice button.active,.grade-choice button:hover,.inline-form button:hover{background:var(--ink);color:var(--lime)}.inline-form{grid-template-columns:1fr auto}.setting-card>.group-membership{margin:14px 0 0;padding:10px 0 0;display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--line)}.group-membership p{margin:0}.group-membership button{min-height:32px;padding:6px 10px;border:1px solid var(--line);border-radius:7px;background:transparent;color:var(--muted);cursor:pointer;font-size:12px;font-weight:750}.account-delete-card{align-self:start}.account-delete-card summary{cursor:pointer;color:var(--muted);font-size:12px;font-weight:750}.account-delete-card[open] summary{margin-bottom:12px;color:var(--ink)}.account-delete-form label{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:start;gap:8px;color:var(--muted);font-size:12px;line-height:1.45}.account-delete-form button{min-height:40px;border:1px solid #b7473d;border-radius:8px;background:transparent;color:#9b2922;cursor:pointer;font-size:12px;font-weight:700}.account-delete-form button:disabled{cursor:not-allowed;opacity:.45}.account-social-auth{margin-top:20px;padding-top:18px;border-top:1px solid var(--line)}.account-social-auth>p{margin:0 0 12px;display:flex;align-items:center;gap:10px;color:var(--muted);font-size:14px}.account-social-auth>p:after,.account-social-auth>p:before{height:1px;flex:1 1;background:var(--line);content:""}.account-social-auth>div{display:grid;gap:8px}.social-auth-button{min-height:52px;padding:7px 13px;display:grid;grid-template-columns:34px minmax(0,1fr) auto;align-items:center;gap:10px;border:1px solid #cfd7e4;border-radius:10px;background:white;color:var(--ink);cursor:pointer;font-size:15px;font-weight:700;text-align:left}.social-auth-button>b{min-width:0}.social-auth-button>small{color:var(--muted);font-size:11px;font-weight:600;text-align:right}.social-auth-button:hover{border-color:var(--blue);background:#f5f7ff}.social-auth-button:disabled{cursor:not-allowed;opacity:.55}.account-social-auth[aria-busy=true] .social-auth-button:disabled{cursor:wait}.account-login-method-list button>span,.social-auth-button>span{width:28px;height:28px;display:grid;place-items:center;border-radius:8px;background:#edf1fa;color:var(--blue);font-size:13px;font-weight:800}.social-auth-button.vk>span{background:#eaf4ff;color:#0077ff}.social-auth-button.yandex>span{background:#fff0ed;color:#dc2d20}.account-social-auth>small{margin-top:10px;display:block;font-size:12px;line-height:1.5}.account-delete-social-note,.account-login-methods>p{margin:8px 0 0;color:var(--muted);font-size:14px;line-height:1.45}.account-login-method-list{margin-top:14px;display:grid;gap:8px}.account-login-method-list button{min-height:48px;padding:9px 11px;display:grid;grid-template-columns:30px minmax(0,1fr) auto;align-items:center;gap:10px;border:1px solid var(--line);border-radius:10px;background:white;color:var(--ink);cursor:pointer;text-align:left}.account-login-method-list button:hover:not(:disabled){border-color:var(--blue);background:#f5f7ff}.account-login-method-list button:disabled{cursor:default;opacity:.72}.account-login-method-list button small{color:var(--muted);font-size:12px;font-weight:700}body,html{max-width:100%;overflow-x:clip}.seo-problem-card,.seo-problem-option-math,.seo-problem-options,.seo-problem-options li,.solution-given,.solution-sheet,.solution-sheet-body,.solution-steps,.solution-steps>li{min-width:0}.seo-problem-option-math{width:100%;max-width:100%}.legal-version{margin-top:28px;color:var(--muted);font-size:12px}.teacher-shell{min-height:680px;padding:clamp(58px,7vw,104px) clamp(22px,7vw,108px)}.teacher-heading{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:60px;align-items:end;padding-bottom:58px;border-bottom:1px solid var(--line)}.teacher-heading>div{min-width:0}.teacher-shell>h1:first-child{margin:0 0 10px}.teacher-shell>h1:first-child+p{margin:0 0 18px;color:var(--muted);line-height:1.55}.create-group{padding:20px;border:1px solid var(--line);border-radius:13px;background:var(--card)}.create-group button{background:var(--ink);color:white}.teacher-empty{min-height:340px;display:grid;place-items:center;align-content:center;text-align:center}.teacher-empty span{color:var(--blue);font-size:12px;font-weight:700}.teacher-empty h2{margin:12px 0 6px;font-size:30px}.no-students,.teacher-empty p{color:var(--muted);font-size:12px}.teacher-group{margin-top:28px;overflow:hidden;border:1px solid var(--line);border-radius:15px;background:var(--card)}.teacher-group>header{padding:22px 24px;display:flex;justify-content:space-between;align-items:center;gap:24px;border-bottom:1px solid var(--line)}.teacher-group>header span{color:var(--muted);font-size:12px;font-weight:700;letter-spacing:.09em}.teacher-group h2{margin:5px 0 0;font-size:25px}.join-code{display:grid;gap:4px;text-align:right}.join-code strong{color:var(--blue);font-size:20px;letter-spacing:.12em}.student-table{overflow-x:auto}.student-row{min-width:900px;padding:15px 24px;display:grid;grid-template-columns:1.4fr .65fr .65fr .65fr .85fr .85fr;gap:18px;align-items:center;border-bottom:1px solid #ede8df;color:var(--muted);font-size:12px}.student-row:last-child{border-bottom:0}.student-row.table-head{color:#8b8478;background:#f5f2eb;font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase}.student-row span:first-child{min-width:0;display:grid;gap:3px}.student-row b{color:var(--ink);font-size:12px}.student-row small{color:var(--muted);line-height:1.35;overflow-wrap:anywhere}.no-students{margin:0;padding:28px 24px}.owner-shell{min-height:680px;padding:clamp(52px,6vw,88px) clamp(22px,6vw,92px) 100px}.owner-state{display:grid;place-items:center;align-content:center;gap:12px;text-align:center}.owner-state h1{margin:0;font-size:clamp(38px,5vw,66px);letter-spacing:-.05em}.owner-state p{margin:0;color:var(--muted);line-height:1.55}.owner-heading{padding-bottom:38px;display:flex;align-items:end;justify-content:space-between;gap:32px;border-bottom:1px solid var(--line)}.owner-chart-card>header>div,.owner-heading>div,.owner-student>header>div,.owner-students>header>div{min-width:0}.owner-heading h1{margin:0;font-size:clamp(50px,6vw,88px);line-height:.92;letter-spacing:-.06em}.owner-heading>div>p:last-child{max-width:620px;margin:20px 0 0;color:var(--muted);font-size:14px;line-height:1.65}.owner-refresh{min-height:46px;padding:0 18px;flex:0 0 auto;border:1px solid var(--ink);border-radius:9px;background:var(--ink);color:white;cursor:pointer;font-size:12px;font-weight:700}.owner-refresh:hover{background:var(--blue);border-color:var(--blue)}.owner-refresh:disabled{cursor:wait;opacity:.6}.owner-action-message{margin:18px 0 0;padding:12px 14px;border:1px solid #b8ca81;border-radius:9px;background:#eef5dc;color:#425b16;font-size:12px;font-weight:750}.owner-metrics{margin-top:24px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.owner-metrics article{min-height:154px;padding:20px;display:grid;align-content:space-between;border:1px solid var(--line);border-radius:14px;background:var(--card)}.owner-chart-card header span,.owner-metrics span,.owner-traffic-card>span{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.09em;text-transform:uppercase}.owner-metrics strong{margin:15px 0;font-size:clamp(34px,4vw,54px);line-height:1;letter-spacing:-.05em}.owner-metrics p{margin:0;color:var(--muted);font-size:12px;line-height:1.45}.owner-facts{margin-top:9px;display:flex;gap:7px;overflow-x:auto;scrollbar-width:thin}.owner-facts span{min-height:38px;padding:0 12px;display:inline-flex;align-items:center;gap:8px;flex:0 0 auto;border:1px solid var(--line);border-radius:999px;background:rgba(255,254,250,.62);color:var(--muted);font-size:12px}.owner-facts b{color:var(--ink);font-size:12px}.owner-grid{margin-top:10px;display:grid;grid-template-columns:minmax(0,1.55fr) minmax(270px,.65fr);gap:10px}.owner-chart-card,.owner-traffic-card{min-height:310px;padding:24px;border:1px solid var(--line);border-radius:15px;background:var(--card)}.owner-chart-card>header{display:flex;align-items:end;justify-content:space-between;gap:24px}.owner-chart-card h2,.owner-students h2,.owner-traffic-card h2{margin:6px 0 0;font-size:25px;letter-spacing:-.035em}.owner-chart-card header>p{margin:0;display:flex;flex-wrap:wrap;align-items:center;gap:5px 8px;color:var(--muted);font-size:12px}.owner-chart-card header i{width:8px;height:8px;display:inline-block;border-radius:50%;background:var(--blue)}.owner-chart-card header i:last-of-type{margin-left:5px;background:var(--lime);border:1px solid #9cb532}.owner-bars{height:190px;margin-top:24px;grid-template-columns:repeat(14,minmax(12px,1fr));gap:clamp(3px,.7vw,10px)}.owner-bar-day,.owner-bars{display:grid;align-items:end}.owner-bar-day{height:100%;min-width:0;grid-template-rows:1fr auto;gap:7px}.owner-bar-stack{height:100%;display:flex;align-items:end;justify-content:center;gap:2px;border-bottom:1px solid #d9d4ca}.owner-bar-stack b,.owner-bar-stack i{width:min(10px,44%);min-height:3px;display:block;border-radius:4px 4px 0 0;background:var(--blue)}.owner-bar-stack b{background:var(--lime)}.owner-bar-day>span{overflow:hidden;color:#8a8378;font-size:12px;text-align:center;white-space:nowrap}.owner-traffic-card{display:flex;flex-direction:column;background:var(--ink);color:white;border-color:#354252}.owner-traffic-card>span{color:var(--lime)}.owner-traffic-card p{color:#aeb8c5;font-size:12px;line-height:1.65}.owner-traffic-card a{min-height:44px;margin-top:auto;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;border:1px solid #516071;border-radius:8px;color:var(--lime);font-size:12px;font-weight:700}.owner-traffic-card a:hover{border-color:var(--lime)}.owner-students{margin-top:46px}.owner-students>header{display:flex;align-items:end;justify-content:space-between;gap:24px}.owner-students .eyebrow{margin-bottom:5px}.owner-search{width:min(380px,100%);display:grid;gap:6px;color:var(--muted);font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.owner-search input{width:100%;min-height:48px;padding:0 14px;border:1px solid var(--line);border-radius:9px;background:var(--card);color:var(--ink);font-size:16px;outline:none}.owner-search input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(35,72,219,.1)}.owner-filters{margin:18px 0;display:flex;gap:7px;overflow-x:auto;padding-bottom:4px}.owner-filters button{min-height:42px;padding:0 14px;flex:0 0 auto;border:1px solid var(--line);border-radius:999px;background:transparent;color:var(--muted);cursor:pointer;font-size:12px;font-weight:700}.owner-filters button.active{border-color:var(--ink);background:var(--ink);color:var(--lime)}.owner-student-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.owner-student{padding:20px;border:1px solid var(--line);border-radius:14px;background:var(--card)}.owner-student.attention{border-color:#deb49d;background:linear-gradient(145deg,#fffefa,#fff5ef)}.owner-student>header{display:flex;align-items:start;justify-content:space-between;gap:15px}.owner-student h3{margin:0;font-size:18px;letter-spacing:-.025em}.owner-student header a{margin-top:4px;display:block;color:var(--muted);font-size:12px;overflow-wrap:anywhere}.owner-student header>span{padding:6px 8px;border-radius:999px;background:#edf2de;color:#567019;font-size:12px;font-weight:700;line-height:1.35;text-align:center}.owner-student.attention header>span{background:#fff0e8;color:#934329}.owner-student-meta{margin-top:15px;display:flex;flex-wrap:wrap;gap:6px}.owner-student-meta span{padding:5px 7px;border:1px solid var(--line);border-radius:6px;color:var(--muted);font-size:12px}.owner-progress-copy{margin-top:18px;display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:12px}.owner-progress-copy>span{min-width:0;line-height:1.4}.owner-progress-copy b{color:var(--blue)}.owner-progress{height:6px;margin-top:7px;overflow:hidden;border-radius:999px;background:#e4dfd5}.owner-progress span{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,var(--blue),#7992ef)}.owner-student dl{margin:18px 0 0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px}.owner-student dl div{min-width:0;padding-top:10px;border-top:1px solid #e7e2d9}.owner-student dt{color:var(--muted);font-size:12px;line-height:1.35}.owner-student dd{margin:5px 0 0;font-size:15px;font-weight:800}.owner-student>p{margin:16px 0 0;color:var(--muted);font-size:12px;line-height:1.5}.owner-delete-trigger{min-height:36px;margin-top:16px;padding:7px 11px;border:1px solid #d8aaa2;border-radius:8px;background:transparent;color:#9b2922;cursor:pointer;font-size:12px;font-weight:700}.owner-delete-trigger:hover{border-color:#a93b32;background:#fff0ed}.owner-delete-trigger:disabled{cursor:not-allowed;opacity:.45}.owner-delete-confirm{margin-top:10px;padding:14px;display:grid;gap:9px;border:1px solid #d99b90;border-radius:10px;background:#fff5f2}.owner-delete-confirm>b{color:#7f2822;font-size:12px;line-height:1.45}.owner-delete-confirm>p{margin:0;color:#76534d;font-size:12px;line-height:1.5}.owner-delete-confirm>strong{color:var(--ink);font-size:12px;overflow-wrap:anywhere}.owner-delete-confirm>input{width:100%;min-height:40px;padding:8px 10px;border:1px solid #cfaaa3;border-radius:7px;background:white;color:var(--ink);outline:none}.owner-delete-confirm>input:focus{border-color:#a93b32;box-shadow:0 0 0 3px rgba(169,59,50,.1)}.owner-delete-confirm>div{display:grid;grid-template-columns:1fr auto;gap:7px}.owner-delete-confirm button{min-height:38px;padding:7px 11px;border:1px solid var(--line);border-radius:7px;background:white;color:var(--muted);cursor:pointer;font-size:12px;font-weight:700}.owner-delete-confirm button:first-child{border-color:#a93b32;background:#a93b32;color:white}.owner-delete-confirm button:disabled{cursor:not-allowed;opacity:.45}.owner-empty{padding:48px 20px;border:1px dashed var(--line);border-radius:14px;color:var(--muted);text-align:center}.account-achievements{padding:20px;position:relative;overflow:hidden;border-color:#dce3ef;background:linear-gradient(145deg,#ffffff,#fbfcff 68%,#f6f9eb)}.account-achievements:after{content:"";width:150px;height:150px;position:absolute;right:-82px;top:-82px;border:1px solid rgba(36,85,214,.12);border-radius:50%;box-shadow:0 0 0 17px rgba(214,255,103,.12),0 0 0 35px rgba(36,85,214,.035);pointer-events:none}.account-achievements-heading{display:flex;align-items:start;justify-content:space-between;gap:14px;position:relative;z-index:1}.account-achievements-heading>div{min-width:0}.account-achievements-heading>div>span{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.12em}.account-achievements-heading h2{margin:6px 0 0;font-size:clamp(19px,2.2vw,25px);line-height:1.1;letter-spacing:-.04em}.account-level-mark{width:54px;height:54px;display:grid;place-items:center;flex:0 0 auto;position:relative;border:1px solid #b8ce58;border-radius:17px;background:#172033;color:white;box-shadow:0 10px 22px rgba(23,32,51,.15);transform:rotate(7deg)}.account-level-mark:before{content:"";position:absolute;inset:5px;border:1px solid rgba(214,255,103,.55);border-radius:12px;transform:rotate(-7deg)}.account-level-mark i{position:absolute;top:5px;right:7px;color:var(--lime);font-size:12px;font-style:normal}.account-level-mark b{position:relative;z-index:1;font-size:22px;line-height:1}.account-level-mark small{position:absolute;bottom:5px;left:0;right:0;color:#c6d0db;font-size:12px;font-weight:700;letter-spacing:.06em;text-align:center;text-transform:uppercase}.account-xp-copy{margin-top:18px;position:relative;z-index:1}.account-xp-copy strong{color:var(--ink);font-size:13px}.account-achievements .account-level-progress{height:9px;margin-top:8px;position:relative;z-index:1;background:#e7ebf0;box-shadow:inset 0 1px 2px rgba(23,32,51,.06)}.account-achievements .account-level-progress span{background:linear-gradient(90deg,#2d63dd,#c9f044);box-shadow:0 0 14px rgba(188,231,58,.45)}.account-achievements .account-progress-summary{margin-top:18px;position:relative;z-index:1;border-color:#e3e7ed;background:rgba(255,255,255,.74)}.account-achievements .account-progress-summary>div{padding-block:10px}.account-rewards-preview{margin-top:18px;padding-top:15px;position:relative;z-index:1;border-top:1px solid #e6e9ee}.account-rewards-preview>div:first-child{display:flex;align-items:baseline;justify-content:space-between;gap:9px}.account-rewards-preview b{font-size:12px}.account-rewards-preview p,.account-rewards-preview small{margin:0;color:var(--muted);font-size:12px;line-height:1.45}.account-reward-emblems{margin-top:10px;display:flex;align-items:center;gap:6px}.account-reward-emblems .achievement-emblem{width:37px;height:37px}.account-achievements-link{min-height:39px;margin-top:16px;padding:0 11px;display:flex;align-items:center;justify-content:space-between;position:relative;z-index:1;border:1px solid #cbd6ef;border-radius:9px;color:var(--blue);font-size:12px;font-weight:700}.account-achievements-link b{color:var(--ink);font-size:16px;line-height:1}.account-achievements-link:hover{border-color:var(--blue);background:#f0f4ff}.achievement-emblem{display:block;flex:0 0 auto;filter:drop-shadow(0 7px 9px rgba(23,32,51,.16));transition:transform .2s ease}.achievement-hub{width:min(1120px,100%);margin:0 auto;padding:clamp(34px,5vw,64px) clamp(22px,6vw,76px) 84px}.achievement-hub-heading{display:flex;align-items:end;justify-content:space-between;gap:30px}.achievement-hub-heading>div{min-width:0}.achievement-hub-heading .eyebrow{margin-bottom:9px}.achievement-hub-heading h1{margin:0;font-size:clamp(39px,5vw,66px);line-height:.95;letter-spacing:-.058em}.achievement-hub-heading p:not(.eyebrow){margin:12px 0 0;color:var(--muted);font-size:14px}.achievement-hub-total{min-width:100px;padding:11px 13px;display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:8px;border:1px solid #e1dfd2;border-radius:13px;background:#fffefa;box-shadow:0 9px 24px rgba(23,32,51,.045)}.achievement-hub-total b{color:var(--blue);font-size:27px;line-height:1}.achievement-hub-total small{color:var(--muted);font-size:12px;font-weight:750;line-height:1.35}.achievement-hub-hero{min-height:294px;margin-top:28px;padding:29px 31px;display:grid;grid-template-columns:minmax(0,1fr) minmax(190px,.52fr);align-items:center;gap:25px;position:relative;overflow:hidden;border:1px solid #33445b;border-radius:22px;background:radial-gradient(circle at 81% 37%,rgba(214,255,103,.19),transparent 27%),radial-gradient(circle at 23% 110%,rgba(61,109,226,.22),transparent 43%),#172033;color:white;box-shadow:0 20px 42px rgba(23,32,51,.14)}.achievement-hub-hero:before{content:"";position:absolute;inset:0;opacity:.21;background-image:linear-gradient(120deg,transparent 48%,rgba(255,255,255,.18) 49%,transparent 50%),linear-gradient(30deg,transparent 48%,rgba(214,255,103,.18) 49%,transparent 50%);background-size:90px 90px;-webkit-mask-image:linear-gradient(90deg,black,transparent 82%);mask-image:linear-gradient(90deg,black,transparent 82%);pointer-events:none}.achievement-hero-copy,.achievement-hero-emblem{position:relative;z-index:1}.achievement-hero-kicker,.achievement-section-kicker{margin:0;color:var(--lime);font-size:12px;font-weight:700;letter-spacing:.13em}.achievement-hub-hero h1{max-width:620px;margin:9px 0 0;font-size:clamp(28px,3.7vw,46px);line-height:1;letter-spacing:-.045em}.achievement-hub-hero h1+p{max-width:570px;margin:13px 0 0;color:#c5ced8;font-size:12px;line-height:1.55}.achievement-hero-xp{max-width:515px;margin-top:21px}.achievement-hero-xp strong{font-size:12px}.achievement-hero-xp>i{height:9px;margin-top:8px;display:block;overflow:hidden;border-radius:999px;background:#36455a}.achievement-hero-xp>i>span{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,#5d8eff,var(--lime));box-shadow:0 0 19px rgba(214,255,103,.48)}.achievement-hero-lesson{min-height:44px;margin-top:22px;padding:0 13px 0 15px;display:inline-flex;align-items:center;gap:17px;border:0;border-radius:9px;background:var(--lime);color:var(--ink);cursor:pointer;font-size:12px;font-weight:700}.achievement-hero-lesson b{font-size:18px;font-weight:500}.achievement-hero-lesson:hover{background:white}.achievement-hero-emblem{min-height:210px;display:grid;place-items:center}.achievement-hero-emblem .achievement-emblem{filter:drop-shadow(0 15px 18px rgba(0,0,0,.22))}.achievement-level-number{width:36px;height:36px;display:grid;place-items:center;position:absolute;right:max(9px,18%);bottom:7px;border:2px solid var(--lime);border-radius:50%;background:#172033;color:var(--lime);font-size:14px;font-weight:900;box-shadow:0 0 0 5px rgba(214,255,103,.11)}.achievement-hero-orbit{width:182px;height:182px;position:absolute;right:10%;top:52%;border:1px solid rgba(214,255,103,.19);border-radius:50%;pointer-events:none}.achievement-hero-orbit-one{transform:translateY(-50%) rotate(35deg) scaleX(1.34)}.achievement-hero-orbit-two{transform:translateY(-50%) rotate(-40deg) scale(.75,1.28)}.achievement-collection,.trophy-collection,.upcoming-achievements{margin-top:38px}.achievement-section-heading{display:flex;align-items:end;justify-content:space-between;gap:22px}.achievement-section-heading>div{min-width:0}.achievement-section-heading h2{margin:7px 0 0;font-size:clamp(27px,3.2vw,39px);line-height:1;letter-spacing:-.045em}.achievement-filters{margin-top:18px;display:flex;gap:7px;overflow-x:auto;scrollbar-width:thin;padding-bottom:3px}.achievement-filters button{min-height:44px;padding:0 13px;flex:0 0 auto;border:1px solid #dce2ed;border-radius:999px;background:#fff;color:var(--muted);cursor:pointer;font-size:12px;font-weight:700}.achievement-filters button.active,.achievement-filters button:hover{border-color:#b7d735;background:#eaff93;color:var(--ink)}.achievement-grid{margin-top:16px;display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:11px}.achievement-card{--rarity-color:#b4713a;--rarity-text-color:#8f5a2c;min-width:0;min-height:239px;padding:12px;display:flex;flex-direction:column;align-items:flex-start;position:relative;overflow:hidden;border:1px solid #dfe4eb;border-radius:16px;background:#fff;color:var(--ink);cursor:pointer;text-align:left;box-shadow:0 7px 18px rgba(23,32,51,.035);transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}.achievement-card:after{content:"";width:57px;height:3px;position:absolute;left:13px;bottom:0;border-radius:999px 999px 0 0;background:var(--rarity-color);opacity:.72}.achievement-card:hover{border-color:var(--rarity-color);box-shadow:0 13px 26px rgba(23,32,51,.1);transform:translateY(-2px)}.achievement-card-bronze{--rarity-color:#b4713a;--rarity-text-color:#8f5a2c}.achievement-card-silver{--rarity-color:#7c8b99;--rarity-text-color:#5f6d79}.achievement-card-gold{--rarity-color:#d9a02a;--rarity-text-color:#a97814}.achievement-card-platinum{--rarity-color:#6f93a8;--rarity-text-color:#4f6d80}.achievement-card-locked{color:#596675}.achievement-card-locked .achievement-emblem{filter:grayscale(1) saturate(.2);opacity:.56}.achievement-card-in_progress{border-color:color-mix(in srgb,var(--rarity-color) 31%,#dfe4eb)}.achievement-card-new,.achievement-card-unlocked{border-width:2px;border-color:#6e8b2c;box-shadow:0 0 0 3px rgba(110,139,44,.12),0 13px 29px rgba(110,139,44,.14)}.achievement-card-topline{width:100%;min-height:17px;display:flex;align-items:center;justify-content:space-between;gap:5px}.achievement-tier{display:inline-flex;align-items:center;gap:5px;color:var(--rarity-text-color,var(--blue));font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase}.achievement-tier i{width:6px;height:6px;display:block;border-radius:50%;background:currentColor;box-shadow:0 0 0 3px color-mix(in srgb,currentColor 12%,transparent)}.achievement-tier-bronze{--rarity-color:#b4713a;--rarity-text-color:#8f5a2c}.achievement-tier-silver{--rarity-color:#7c8b99;--rarity-text-color:#5f6d79}.achievement-tier-gold{--rarity-color:#d9a02a;--rarity-text-color:#a97814}.achievement-tier-platinum{--rarity-color:#6f93a8;--rarity-text-color:#4f6d80}.achievement-lock{width:18px;height:18px;display:grid;place-items:end center;position:relative}.achievement-lock:before{content:"";width:9px;height:8px;display:block;border:1.5px solid #798697;border-radius:3px;background:#e4e8ed}.achievement-lock i{width:7px;height:7px;position:absolute;top:2px;border:1.5px solid #798697;border-bottom:0;border-radius:6px 6px 0 0}.achievement-new-mark{padding:3px 5px;border-radius:999px;background:#eaff93;color:#3d5211;font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase}.achievement-card-copy{width:100%;margin-top:7px;display:grid;gap:4px}.achievement-card-copy strong{font-size:12px;line-height:1.2}.achievement-card-copy small{min-height:29px;color:var(--muted);font-size:12px;line-height:1.4}.achievement-card-state{width:100%;margin-top:auto;display:grid;gap:5px}.achievement-card-state b{color:var(--rarity-text-color,var(--rarity-color));font-size:12px;font-weight:700}.achievement-card-locked .achievement-card-state b{color:#687789}.achievement-card-almost{padding:2px 6px;border-radius:999px;background:color-mix(in srgb,var(--rarity-color) 16%,transparent);color:var(--rarity-text-color);font-size:12px;font-weight:800;letter-spacing:.03em;text-transform:uppercase;animation:achievement-almost-pulse 1.8s ease-in-out infinite}@media (prefers-reduced-motion:reduce){.achievement-card-almost{animation:none}}.achievement-card-progress{height:4px;display:block;overflow:hidden;border-radius:999px;background:#e5e9ee}.achievement-card-progress i{height:100%;display:block;border-radius:inherit;background:var(--rarity-color)}.achievement-card-compact{min-height:0;padding:8px}.achievement-card-compact .achievement-card-copy small,.achievement-card-compact .achievement-card-state{display:none}.trophy-collection{padding:25px;border:1px solid #e4ded1;border-radius:20px;background:linear-gradient(135deg,#fffefa,#fbfaf6);box-shadow:0 12px 30px rgba(23,32,51,.04)}.platinum-showcase{width:100%;margin-top:20px;padding:24px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:20px;border:1px solid #405064;border-radius:20px;background:radial-gradient(circle at 85% 20%,rgba(214,255,103,.14),transparent 35%),radial-gradient(circle at 8% 100%,rgba(111,147,168,.35),transparent 45%),#172033;color:white;cursor:pointer;text-align:left}.platinum-showcase.unlocked{border-color:var(--lime);box-shadow:0 0 0 2px color-mix(in srgb,var(--lime) 30%,transparent)}.platinum-showcase.locked{background:linear-gradient(145deg,#f5f7fa,#eceff3);border-color:#dbe1e9;color:var(--ink)}.platinum-showcase.locked .achievement-emblem{filter:grayscale(1) saturate(.2);opacity:.56}.platinum-showcase-copy{min-width:0;display:grid;gap:4px}.platinum-showcase-copy em{color:var(--lime);font-size:12px;font-weight:800;font-style:normal;letter-spacing:.1em}.platinum-showcase.locked .platinum-showcase-copy em{color:#6f93a8}.platinum-showcase-copy b{font-size:21px;letter-spacing:-.03em}.platinum-showcase-copy small{color:#c5ced8;font-size:12px;line-height:1.4}.platinum-showcase.locked .platinum-showcase-copy small{color:var(--muted)}.platinum-showcase-state{min-width:96px;color:var(--lime);font-size:12px;font-weight:800;text-align:right}.platinum-showcase.locked .platinum-showcase-state{color:#4f6d80}.platinum-showcase-progress{width:96px;height:5px;margin-top:7px;display:block;overflow:hidden;border-radius:999px;background:rgba(255,255,255,.14)}.platinum-showcase.locked .platinum-showcase-progress{background:#dfe5ee}.platinum-showcase-progress span{height:100%;display:block;border-radius:inherit;background:var(--lime)}.platinum-showcase.locked .platinum-showcase-progress span{background:#6f93a8}.trophy-collection-grid{margin-top:20px;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0}.trophy-collection-card{min-height:142px;padding:8px 15px;display:grid;grid-template-columns:72px minmax(0,1fr);grid-template-rows:1fr auto;align-items:center;gap:5px 10px;border:0;border-right:1px solid #e4ded1;background:transparent;color:var(--ink);cursor:pointer;text-align:left}.trophy-collection-card:last-child{border-right:0}.trophy-collection-card.unlocked{box-shadow:inset 0 -3px 0 #6e8b2c}.trophy-collection-card>span{min-width:0;display:grid;gap:4px}.trophy-collection-card b{font-size:17px;letter-spacing:-.03em}.trophy-collection-card small{color:var(--muted);font-size:12px;line-height:1.45}.trophy-collection-card>i{grid-column:2;color:#718039;font-size:12px;font-style:normal;font-weight:700}.trophy-collection-card.locked>.achievement-emblem{filter:grayscale(1) saturate(.58) brightness(.93);opacity:.58}.trophy-collection-card.locked>i{color:var(--muted)}.trophy-collection-card:hover .achievement-emblem{transform:translateY(-3px) scale(1.04)}.upcoming-achievements{padding-bottom:12px}.upcoming-achievements-list{margin-top:18px;display:grid;border:1px solid #dfe4eb;border-radius:17px;overflow:hidden;background:#fff;box-shadow:0 10px 25px rgba(23,32,51,.04)}.upcoming-achievements-list>button{min-height:82px;padding:11px 13px;display:grid;grid-template-columns:48px minmax(0,1fr) minmax(120px,.7fr) auto 18px;align-items:center;gap:11px;border:0;border-bottom:1px solid #e7ebf1;background:transparent;color:var(--ink);cursor:pointer;text-align:left}.upcoming-achievements-list>button:last-child{border-bottom:0}.upcoming-achievements-list>button:hover{background:#fafcff}.upcoming-achievements-list>button>span:not(.achievement-emblem){min-width:0;display:grid;gap:3px}.upcoming-achievements-list b{font-size:12px}.upcoming-achievements-list small{color:var(--muted);font-size:12px;line-height:1.42}.upcoming-achievements-list>button>i{height:5px;overflow:hidden;border-radius:999px;background:#e6e8e4}.upcoming-achievements-list>button>i span{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,#a4cc26,#d9f75d)}.upcoming-achievements-list>button>strong{font-size:12px;white-space:nowrap}.upcoming-achievements-list>button>em{color:var(--blue);font-size:17px;font-style:normal}.achievement-honest-empty{margin:16px 0 0;padding:18px;border:1px dashed #cbd3dd;border-radius:13px;color:var(--muted);font-size:12px;line-height:1.55;text-align:center}.achievement-dialog-backdrop,.achievement-unlock-backdrop{padding:24px;display:grid;place-items:center;position:fixed;inset:0;z-index:80;background:rgba(14,22,35,.58);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.achievement-detail{width:min(420px,100%);max-height:calc(100dvh - 48px);padding:27px;display:grid;justify-items:center;position:relative;overflow-y:auto;border:1px solid #dbe2ee;border-radius:23px;background:#fff;box-shadow:0 28px 68px rgba(10,18,29,.32)}.achievement-detail-locked{background:linear-gradient(145deg,#fbfcfe,#f3f5f8)}.achievement-dialog-close{width:34px;height:34px;display:grid;place-items:center;position:absolute;right:13px;top:13px;border:1px solid #dce3ed;border-radius:50%;background:white;color:var(--ink);cursor:pointer;font-size:22px;line-height:1}.achievement-detail-heading{margin-top:8px;display:grid;justify-items:center;gap:7px;text-align:center}.achievement-detail-heading h2{margin:0;font-size:28px;letter-spacing:-.045em}.achievement-detail-heading p{margin:0;color:var(--muted);font-size:12px}.achievement-detail-facts{width:100%;margin:21px 0 0;display:grid;gap:0;border:1px solid #e1e6ed;border-radius:13px;overflow:hidden}.achievement-detail-facts div{min-height:49px;padding:10px 12px;display:grid;grid-template-columns:88px minmax(0,1fr);align-items:center;gap:10px;border-bottom:1px solid #e8ebf0}.achievement-detail-facts div:last-child{border-bottom:0}.achievement-detail-facts dt{color:var(--muted);font-size:12px;font-weight:700;text-transform:uppercase}.achievement-detail-facts dd{margin:0;color:var(--ink);font-size:12px;font-weight:750;line-height:1.4}.achievement-detail-remaining{width:100%;margin-top:14px;padding:13px;border:1px solid #d6dfef;border-radius:12px;background:#f5f8ff}.achievement-detail-remaining span:first-child{display:block;margin-bottom:8px;color:var(--blue);font-size:12px;font-weight:800;text-align:center}.achievement-detail-remaining i{height:5px;display:block;overflow:hidden;border-radius:999px;background:#dfe5ee}.achievement-detail-remaining i span{height:100%;display:block;border-radius:inherit;background:var(--blue)}@keyframes achievement-unlock-enter{0%{transform:translateY(14px) scale(.96);opacity:0}65%{transform:translateY(-2px) scale(1.01);opacity:1}to{transform:translateY(0) scale(1)}}@keyframes achievement-trophy-bounce{0%,to{transform:translateY(0) scale(1.15)}48%{transform:translateY(-7px) scale(1.2)}}@keyframes achievement-almost-pulse{0%,to{opacity:1}50%{opacity:.58}}@keyframes achievement-confetti-fall{0%{transform:translateY(-14px) rotate(0);opacity:0}18%{opacity:1}to{transform:translate(var(--confetti-x),135px) rotate(250deg);opacity:0}}.achievement-unlock{width:min(475px,100%);padding:29px;display:grid;justify-items:center;position:relative;overflow:hidden;border:1px solid #465970;border-radius:24px;background:radial-gradient(circle at 50% 26%,rgba(214,255,103,.22),transparent 27%),radial-gradient(circle at 12% 100%,rgba(58,106,222,.28),transparent 43%),#172033;color:white;box-shadow:0 34px 72px rgba(8,14,25,.42);animation:achievement-unlock-enter .7s both}.achievement-unlock>.achievement-emblem{margin-top:5px;filter:drop-shadow(0 16px 18px rgba(0,0,0,.24));animation:achievement-trophy-bounce 1.1s ease-in-out both}.achievement-unlock-gold,.achievement-unlock-platinum{border-color:color-mix(in srgb,var(--emblem-color,#d9a02a) 55%,#465970);box-shadow:0 0 0 1px color-mix(in srgb,var(--emblem-color,#d9a02a) 40%,transparent),0 34px 84px rgba(8,14,25,.5)}.achievement-unlock-gold{--emblem-color:#d9a02a}.achievement-unlock-platinum{--emblem-color:#6f93a8;background:radial-gradient(circle at 50% 26%,rgba(111,182,255,.28),transparent 30%),radial-gradient(circle at 12% 100%,rgba(214,255,103,.16),transparent 43%),#172033}.achievement-unlock-kicker{margin:0;color:var(--lime);font-size:12px;font-weight:700;letter-spacing:.14em}.achievement-unlock h2{margin:13px 0 0;font-size:34px;line-height:1;letter-spacing:-.045em;text-align:center}.achievement-unlock-copy{margin:9px 0 0;color:#ced7e1;font-size:12px;text-align:center}.achievement-unlock-rewards{width:100%;margin-top:21px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid #405064;border-bottom:1px solid #405064}.achievement-unlock-rewards>div{min-height:68px;padding:11px 6px;display:grid;align-content:center;gap:4px;border-right:1px solid #405064;text-align:center}.achievement-unlock-rewards>div:last-child{border-right:0}.achievement-unlock-rewards span{color:var(--lime);font-size:12px;font-weight:700}.achievement-unlock-rewards small{color:#aebac8;font-size:12px;line-height:1.3}.achievement-unlock-next{width:100%;margin-top:18px;padding:12px;display:grid;grid-template-columns:1fr auto;gap:4px 10px;border:1px solid #46576b;border-radius:12px;background:rgba(255,255,255,.05)}.achievement-unlock-next>span{color:#aebac8;font-size:12px}.achievement-unlock-next b{grid-row:2;font-size:12px}.achievement-unlock-next i{height:5px;grid-column:1;grid-row:3;overflow:hidden;border-radius:999px;background:#3a495d}.achievement-unlock-next i span{height:100%;display:block;border-radius:inherit;background:var(--lime)}.achievement-unlock-next small{grid-column:2;grid-row:3;color:var(--lime);font-size:12px;font-weight:700}.achievement-unlock-actions{width:100%;margin-top:20px;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,.8fr);gap:8px}.achievement-unlock-actions>*{min-height:44px;padding:0 12px;display:inline-flex;align-items:center;justify-content:center;gap:11px;border-radius:9px;font-size:12px;font-weight:700;text-align:center}.achievement-unlock-actions button{border:0;background:var(--lime);color:var(--ink);cursor:pointer}.achievement-unlock-actions button span{font-size:16px}.achievement-unlock-actions a{border:1px solid #647388;color:white}.achievement-unlock-actions button:hover{background:white}.achievement-unlock-actions a:hover{border-color:var(--lime);color:var(--lime)}.achievement-unlock-actions .achievement-unlock-link{border:1px solid #647388;background:transparent;color:white}.achievement-unlock-actions .achievement-unlock-link:hover{border-color:var(--lime);background:transparent;color:var(--lime)}.achievement-confetti{width:7px;height:12px;position:absolute;top:18%;border-radius:2px;background:var(--lime);animation:achievement-confetti-fall 1.08s ease-out both}.achievement-confetti-one{--confetti-x:-65px;left:25%;background:#79a7ff}.achievement-confetti-two{--confetti-x:75px;right:25%;background:#c987f5;animation-delay:.1s}.achievement-confetti-three{--confetti-x:15px;left:52%;background:#ffd45b;animation-delay:.19s}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible,textarea:focus-visible{outline:3px solid var(--blue);outline-offset:3px}@media (min-width:721px){footer{padding-bottom:82px}}@media (max-width:1050px){.formula-grid{grid-template-columns:repeat(2,1fr)}.achievement-grid,.achievement-list{grid-template-columns:repeat(3,minmax(0,1fr))}.owner-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.owner-grid{grid-template-columns:1fr}}@media (min-width:721px) and (max-width:980px){.topbar{padding-inline:22px;grid-template-columns:minmax(150px,1fr) auto auto;gap:16px}.topbar nav{gap:13px;font-size:12.5px}}@media (max-width:720px){body{padding-bottom:calc(70px + env(safe-area-inset-bottom))}html.portal-choice-active,html.portal-choice-active body{width:100%;height:100dvh;overflow:hidden;overscroll-behavior:none}html.portal-choice-active body{padding-bottom:0}.locale-switcher{left:50%;right:auto;top:8px;bottom:auto;min-height:48px;padding:2px;transform:translateX(-50%);box-shadow:none}.locale-switcher a{min-width:44px;height:44px;padding:0 5px;font-size:12px;font-weight:700}@media (max-width:340px){.locale-switcher a{min-width:36px}}.topbar{height:64px;padding:0 max(15px,env(safe-area-inset-right)) 0 max(15px,env(safe-area-inset-left));grid-template-columns:minmax(0,1fr) auto;gap:10px;-webkit-backdrop-filter:none;backdrop-filter:none}.brand{min-width:44px;min-height:44px;gap:8px;font-size:17px}.brand>span:not(.brand-mark){display:none}.brand-mark{width:32px;height:32px;font-size:22px}.topbar nav{height:calc(62px + env(safe-area-inset-bottom));padding:3px 2px env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:1px;position:fixed;left:0;right:0;bottom:0;z-index:50;border-top:1px solid var(--line);background:rgba(255,254,250,.96);box-shadow:0 -10px 28px rgba(23,32,43,.08);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.topbar nav a{min-width:0;min-height:56px;padding:0 1px;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:12px;font-weight:600;line-height:1.2;letter-spacing:-.3px;text-align:center}.topbar nav a>span{min-width:0;overflow-wrap:break-word;-webkit-hyphens:auto;hyphens:auto}.topbar nav .active{color:var(--blue);box-shadow:inset 0 2px var(--blue)}.topbar-account{min-height:44px;padding:0 13px;font-size:12px}.release-status{align-items:flex-start;flex-direction:column;gap:2px;text-align:left}.release-status strong:after{content:"";margin:0}.portal-choice-page{height:calc(100dvh - 66px - env(safe-area-inset-bottom));min-height:0;overflow:hidden}html.portal-choice-active .portal-choice-page{width:100%;height:100dvh;position:fixed;inset:0}.portal-choice{height:calc(100% - 64px);min-height:0;padding:18px max(14px,env(safe-area-inset-right)) 14px max(14px,env(safe-area-inset-left));display:grid;grid-template-rows:auto minmax(0,1fr);align-content:stretch;gap:14px;overflow:hidden}html.portal-choice-active .portal-choice{height:calc(100dvh - 168px - env(safe-area-inset-bottom))}.portal-choice-intro{text-align:left}.portal-choice-intro .eyebrow{display:none}.portal-choice-intro h1{font-size:clamp(29px,9vw,38px)}.portal-choice-intro>p:last-child{margin:7px 0 0;font-size:12px;line-height:1.4}.portal-choice-grid{width:100%;height:100%;padding:0;display:grid;grid-template-rows:repeat(2,auto);grid-template-columns:1fr;align-content:start;gap:10px;overflow:hidden}.portal-choice-card{width:100%;min-width:0;min-height:190px;height:auto;padding:14px 16px;border-radius:15px}.portal-choice-symbol{width:38px;height:38px;margin:0 0 10px;border-radius:10px;font-size:28px}.portal-choice-copy{gap:2px}.portal-choice-copy strong{font-size:clamp(20px,6vw,25px)}.portal-choice-copy small{font-size:12px}.portal-choice-action{min-height:36px;margin-top:20px;padding:0 11px;gap:12px;font-size:12px}.hero{min-height:auto;padding:58px max(20px,env(safe-area-inset-right)) 54px max(20px,env(safe-area-inset-left))}.hero h1{font-size:clamp(48px,15vw,62px);line-height:.9}.hero-copy{margin:26px 0 34px;font-size:16px}.hero-actions{margin-bottom:38px;display:grid;grid-template-columns:1fr}.hero-action{width:100%;min-height:52px}.hero-stats{gap:24px;flex-wrap:wrap}.quick-paths{padding:12px max(12px,env(safe-area-inset-right)) 12px max(12px,env(safe-area-inset-left));grid-template-columns:1fr}.quick-paths>a{min-height:88px;padding:15px;align-items:center}.catalog{padding:54px max(16px,env(safe-area-inset-right)) 72px max(16px,env(safe-area-inset-left))}.catalog-head{align-items:stretch;flex-direction:column}.reference-page{height:calc(100dvh - 66px - env(safe-area-inset-bottom));position:relative;overflow:hidden}.reference-page>footer{display:none}.reference-catalog{height:calc(100% - 64px);min-height:0;padding:0;display:block;position:relative;overflow:hidden;scroll-margin-top:64px}.mobile-reference-track{width:100%;height:100%;display:flex;gap:0;overflow-x:auto;overflow-y:hidden;scroll-snap-type:x mandatory;scrollbar-width:none;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch}.mobile-reference-track::-webkit-scrollbar{display:none}.reference-controls-slide{width:100%;min-width:100%;height:100%;padding:14px max(12px,env(safe-area-inset-right)) 12px max(12px,env(safe-area-inset-left));display:grid;grid-template-rows:auto auto auto auto minmax(0,1fr);gap:8px;overflow:hidden;scroll-snap-align:start;scroll-snap-stop:always}.mobile-quantity-index{min-height:0;display:grid;grid-template-rows:auto minmax(0,1fr);overflow:hidden;border:1px solid #c9c3b8;border-radius:11px;background:rgba(255,255,255,.48)}.mobile-quantity-index>strong{min-height:36px;padding:0 11px;display:flex;align-items:center;border-bottom:1px solid #d7d1c6;color:var(--muted);font-size:12px;letter-spacing:.04em;text-transform:uppercase}.mobile-quantity-list{min-height:0;overflow-y:auto;overscroll-behavior-y:contain;scrollbar-width:thin}.mobile-quantity-list button{width:100%;min-height:48px;padding:8px 11px;display:grid;grid-template-columns:minmax(0,1fr) auto 18px;align-items:center;gap:9px;border:0;border-bottom:1px solid #e0dbd1;background:transparent;color:var(--ink);cursor:pointer;text-align:left}.mobile-quantity-list button:last-child{border-bottom:0}.mobile-quantity-list button:active{background:#edf0ff}.mobile-quantity-list button span{min-width:0;font-size:12px;font-weight:750}.mobile-quantity-list button b{color:var(--blue);font-size:12px}.mobile-quantity-list button i{color:var(--blue);font-size:17px;font-style:normal;text-align:right}.mobile-quantity-empty{margin:0;padding:18px 11px;color:var(--muted);font-size:12px}.reference-catalog .catalog-head{grid-template-columns:1fr;gap:8px}.reference-catalog .catalog-head h1{font-size:30px;line-height:1}.reference-catalog .catalog-head>div>p:last-child{margin-top:6px;font-size:12px;line-height:1.4}.reference-catalog .search{height:48px}.catalog-alphabet{margin:0;padding:0;overflow:hidden}.catalog-alphabet>summary{min-height:44px;padding:0 10px;font-size:12px}.catalog-alphabet>summary:before{width:23px;height:23px;font-size:14px}.catalog-alphabet>summary small{font-size:12px}.catalog-alphabet>nav{padding:0 9px 9px}.catalog-alphabet-heading{display:block}.catalog-alphabet-heading strong{font-size:14px}.catalog-alphabet .letter-row{display:none}.mobile-alphabet-carousel{margin-top:8px;display:grid;grid-template-columns:44px minmax(0,1fr) 44px;align-items:center;gap:6px}.alphabet-carousel-control{width:44px;height:44px;padding:0;border:1px solid var(--line);border-radius:9px;background:var(--card);color:var(--blue);cursor:pointer;font-size:24px;line-height:1}.alphabet-carousel-control:focus-visible,.mobile-letter-track:focus-visible{outline:3px solid var(--blue);outline-offset:2px}.mobile-letter-track{min-width:0;display:flex;gap:6px;overflow-x:auto;overflow-y:hidden;scroll-snap-type:x proximity;scrollbar-width:none;overscroll-behavior-x:contain;touch-action:pan-x}.mobile-letter-track::-webkit-scrollbar{display:none}.mobile-letter-track button{width:44px;min-width:44px;height:44px;padding:0;flex:0 0 44px;scroll-snap-align:center;border:0;border-radius:8px;background:transparent;color:var(--muted);cursor:pointer;font-weight:750}.mobile-letter-track button.selected{background:var(--ink);color:var(--lime)}.catalog-mode-actions{margin:0;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px;position:relative}.all-formulas-button,.catalog-filter-panel>summary{min-height:48px}.all-formulas-button{padding:6px 10px}.catalog-filter-panel>summary{padding:0 9px;gap:7px}.catalog-filter-panel>summary:before{width:24px;height:24px}.catalog-filter-summary-copy{min-width:0}.all-formulas-button small,.all-formulas-button span,.catalog-filter-summary-copy small,.catalog-filter-summary-copy strong{font-size:12px}.catalog-filter-panel{position:static}.catalog-filter-panel[open]{grid-column:auto;overflow:visible}.catalog-filter-panel[open] .filter-block{max-height:calc(100dvh - 260px);padding:16px 12px 18px;display:grid;overflow-y:auto;position:absolute;top:calc(100% + 7px);left:0;right:0;z-index:15;border:1px solid #c5beb2;border-radius:11px;background:var(--paper);box-shadow:0 18px 46px rgba(23,32,43,.2);overscroll-behavior:contain}.catalog-filter-summary-copy{display:grid;gap:2px}.catalog-filter-summary-copy small{display:block}.filter-group{grid-template-columns:1fr}.grade-note{margin-left:0}.letter-row{margin:28px 0 20px;flex-wrap:nowrap;overflow-x:auto}.letter-row button{min-width:44px;height:44px}.grade-row button,.topic-row button{min-height:44px}.reference-catalog .result-line{min-height:28px;margin:0;align-items:center;flex-wrap:nowrap;overflow:hidden;font-size:12px}.reference-catalog .interaction-hint{display:none}.reference-catalog .reset-button{min-height:28px;margin-left:auto;padding:4px 7px;flex:0 0 auto}.reference-catalog .formula-grid{display:contents}.reference-catalog .catalog-load-more{display:none}.reference-catalog .formula-card{width:100%;min-width:100%;height:100%;min-height:0;padding:18px max(16px,env(safe-area-inset-right)) 20px max(16px,env(safe-area-inset-left));overflow-x:hidden;overflow-y:auto;border-radius:0;scroll-snap-align:start;scroll-snap-stop:always;overscroll-behavior-y:contain}.reference-catalog .formula-card-back{width:100%;min-height:42px;margin-bottom:14px;padding:0 11px;display:flex;flex:0 0 auto;align-items:center;gap:9px;position:sticky;top:0;z-index:5;border:1px solid #c9d2f5;border-radius:8px;background:rgba(241,244,255,.96);color:var(--blue);cursor:pointer;font-size:12px;font-weight:700;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.reference-catalog .formula-card-back b{font-size:18px}.formula-list-access{min-height:48px;right:max(10px,env(safe-area-inset-right));bottom:calc(72px + env(safe-area-inset-bottom));padding:6px 14px;border-radius:11px;box-shadow:0 12px 30px rgba(10,18,29,.2);font-size:13px}.formula-list-access:before{font-size:16px}.formula-list-access b{min-width:27px;height:27px;border-radius:7px;font-size:12px}.formula-card.expanded{grid-column:auto}.reference-catalog .empty-state{width:100%;min-width:100%;min-height:0;height:100%;border-radius:0;scroll-snap-align:start;scroll-snap-stop:always}.constants-page{height:calc(100dvh - 66px - env(safe-area-inset-bottom));min-height:0;overflow:hidden}.constants-page>footer{display:none}.constants-hub{height:calc(100% - 64px);min-height:0;padding:8px max(8px,env(safe-area-inset-right)) 8px max(8px,env(safe-area-inset-left));display:block;overflow:hidden}.constants-list-shell{width:100%;height:100%;display:grid;grid-template-rows:auto minmax(0,1fr)}.constants-list-head{min-height:52px;margin:0;padding:0 5px 7px;align-items:center;gap:8px}.constants-list-head .eyebrow{display:none}.constants-list-head h1{font-size:clamp(23px,7vw,29px);line-height:1}.constants-list-head>a{min-width:44px;min-height:44px;padding:0 9px;flex:0 0 auto;justify-content:center;font-size:12px}.constants-list-head>a span{display:none}.constants-list-head>a b{display:inline}.constants-compact-list{min-height:0;grid-template-columns:1fr;grid-auto-rows:minmax(30px,1fr);overflow-y:auto;border-radius:10px;overscroll-behavior-y:contain;scrollbar-width:thin}.constant-compact-row{min-height:0;padding:2px 8px;grid-template-columns:34px minmax(0,1fr) minmax(102px,auto);gap:7px;border-right:0;border-bottom:1px solid var(--line)}.constant-compact-row:nth-child(odd){border-right:0}.constant-compact-row:nth-last-child(-n+2){border-bottom:1px solid var(--line)}.constant-compact-row:last-child{border-bottom:0}.constant-compact-symbol .katex{font-size:clamp(14px,4.6vw,18px)}.constant-compact-name{gap:0}.constant-compact-name b{font-size:clamp(8px,2.7vw,11px);line-height:1.08}.constant-compact-name small{display:none}.constant-compact-value{max-width:128px}.constant-compact-value .katex{font-size:clamp(8px,2.75vw,11px)}.contacts-page{height:calc(100dvh - 66px - env(safe-area-inset-bottom));min-height:0;overflow:hidden}.contacts-page>footer{display:none}.contacts-hub{height:calc(100% - 64px);min-height:0;padding:10px max(10px,env(safe-area-inset-right)) 8px max(10px,env(safe-area-inset-left));display:block;overflow:hidden}.contacts-shell{width:100%;height:100%;display:grid;grid-template-rows:auto minmax(0,1fr) auto;gap:8px}.contacts-heading{max-width:none;margin:0}.contacts-heading .eyebrow{display:none}.contacts-heading h1{font-size:clamp(29px,9vw,38px);line-height:1}.contacts-heading>p:last-child{margin:6px 0 0;font-size:12px;line-height:1.3}.contacts-grid{min-height:0;grid-template-columns:1fr;grid-template-rows:repeat(3,minmax(0,1fr));gap:7px}.contact-card{min-height:0;padding:9px 11px;display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:9px;border-radius:10px}.contact-card-copy{gap:3px}.contact-card-copy small{font-size:12px}.contact-card-copy strong{font-size:clamp(13px,4.3vw,17px)}.contact-card-copy>span{font-size:12px;line-height:1.2}.contact-card-action{font-size:12px}.contacts-author{min-height:38px;margin:0;padding:7px 10px;grid-template-columns:auto minmax(0,1fr);gap:3px 10px;border-radius:9px}.contacts-author small,.contacts-author span{font-size:12px}.contacts-author strong{font-size:12px;text-align:right}.contacts-author small{grid-column:2;text-align:right}.seo-shell{width:calc(100% - 20px);padding:14px 0 28px}.seo-breadcrumbs{margin-bottom:13px;font-size:12px}.seo-hero{padding:22px 18px;border-radius:13px}.seo-hero h1{font-size:clamp(31px,10vw,46px)}.seo-hero>p:not(.eyebrow){margin-top:13px;font-size:12px;line-height:1.45}.seo-summary{margin-top:15px;gap:5px}.seo-summary span{min-height:31px;padding:5px 9px;font-size:12px}.seo-summary b{font-size:12px}.seo-topic-list{margin-top:10px;gap:8px}.seo-content-section,.seo-topic-section{padding:14px 12px;border-radius:11px}.seo-content-section>header,.seo-topic-section>header{margin-bottom:11px;gap:10px}.seo-content-section>header h2,.seo-topic-section>header h2{font-size:21px}.seo-content-section>header>span,.seo-topic-section>header>span{min-width:28px;height:28px;font-size:12px}.seo-grade-grid,.seo-link-grid{grid-template-columns:1fr}.seo-entity-link{min-height:60px;padding:9px 10px;gap:9px}.seo-entity-link strong{font-size:12px}.seo-grade-grid{margin-top:10px;gap:8px}.seo-grade-card{min-height:180px;padding:18px}.seo-grade-card>strong{margin-top:20px;font-size:27px}.seo-cross-links{margin-top:10px}.seo-cross-links a,.seo-primary-action{min-height:48px;padding-inline:16px;font-size:14px}.seo-detail-page{gap:8px}.seo-detail-hero{padding:20px 16px;grid-template-columns:1fr;gap:16px;border-radius:13px}.seo-detail-hero h1{font-size:clamp(29px,9vw,43px)}.seo-detail-hero p:not(.eyebrow){margin-top:11px;font-size:12px}.seo-quantity-card{min-width:0;min-height:96px;padding:12px;grid-template-columns:repeat(2,minmax(0,1fr))}.seo-quantity-card .math-formula:first-child .katex{font-size:28px}.seo-quantity-card small,.seo-quantity-card>span{display:none}.seo-formula-row{min-height:64px;padding:10px;grid-template-columns:1fr;gap:7px}.seo-formula-row>span{max-width:none;font-size:12px;text-align:left}.seo-definition-list{grid-template-columns:1fr}.seo-definition-list>div{grid-template-columns:54px minmax(0,1fr)}.seo-learning-card,.seo-problem-card{padding:12px}.seo-learning-card h3,.seo-problem-card h3{font-size:13px}.seo-learning-card p,.seo-problem-card p{font-size:12px}.seo-problem-card>header{grid-template-columns:minmax(0,1fr) auto}.seo-problem-card>header>small{grid-column:1/-1;text-align:left}.seo-problem-options{grid-template-columns:1fr}.seo-collection-grid{margin-top:10px}.seo-collection-link{min-height:96px}.seo-adjacent-links{grid-template-columns:1fr}.seo-adjacent-links>span{display:none}.seo-adjacent-links a:last-child{text-align:left}.not-found-shell{min-height:calc(100dvh - 126px - env(safe-area-inset-bottom));padding:32px 14px}.footer-meta{align-items:flex-start;flex-direction:column;gap:8px}footer{grid-template-columns:1fr;grid-template-areas:"brand" "author" "socials";padding-top:34px;padding-bottom:34px}.social-links{justify-content:flex-start;margin-top:14px}.learning-page:not(.learning-course-mode)>footer{display:none}.learning-notes-trigger{width:auto;min-width:0;min-height:44px;margin:0;padding:5px 11px 5px 6px;grid-template-columns:32px minmax(0,1fr) 21px;gap:8px;position:fixed;left:max(10px,env(safe-area-inset-left));bottom:calc(72px + env(safe-area-inset-bottom));border-radius:12px;box-shadow:0 10px 26px rgba(23,32,51,.14)}.learning-notes-trigger>span:first-child{width:28px;height:28px;border-radius:7px;font-size:18px}.learning-notes-trigger b{font-size:12px}.learning-notes-trigger small{display:none}.learning-notes-trigger>strong{min-width:21px;height:21px;padding:0 4px;font-size:12px}.learning-notes-panel{width:100%;max-width:none;height:100dvh}.learning-notes-panel>header{padding:20px 16px 17px}.learning-notes-panel>header h2{font-size:29px}.learning-notes-panel>header button{width:40px;height:40px}.learning-notes-content{padding:12px 12px calc(20px + env(safe-area-inset-bottom))}.learning-note-entry{padding:14px}.guest-diagnostic{min-height:auto;padding:18px max(10px,env(safe-area-inset-right)) calc(132px + env(safe-area-inset-bottom)) max(10px,env(safe-area-inset-left))}.diagnostic-intro-card,.diagnostic-question-card,.diagnostic-result-card{border-radius:18px}.diagnostic-intro-card{min-height:0;padding:26px 20px;grid-template-columns:1fr;gap:28px}.diagnostic-intro-copy h1{font-size:clamp(41px,13vw,56px)}.diagnostic-intro-copy>button{width:100%}.diagnostic-intro-orbit{width:190px;justify-self:center}.diagnostic-facts{padding-top:18px}.diagnostic-facts>div{padding:0 10px}.diagnostic-facts dt{font-size:21px}.diagnostic-facts dd{font-size:12px}.diagnostic-question-card{padding:22px 15px}.diagnostic-prompt p{font-size:22px}.diagnostic-options{grid-template-columns:1fr;gap:8px}.diagnostic-options label{min-height:64px}.diagnostic-result-card{padding:26px 16px;grid-template-columns:1fr;gap:22px}.diagnostic-score-ring{width:126px;justify-self:center}.diagnostic-score-ring strong{font-size:38px}.diagnostic-result-copy{text-align:center}.diagnostic-result-copy h1{font-size:39px}.diagnostic-area-results{grid-column:auto;grid-template-columns:repeat(2,minmax(0,1fr))}.diagnostic-area-results>div:last-child{grid-column:1/-1}.diagnostic-disclaimer,.diagnostic-insight-grid,.diagnostic-recommendation,.diagnostic-result-actions{grid-column:auto}.diagnostic-insight-grid{grid-template-columns:1fr}.diagnostic-result-actions{align-items:stretch;flex-direction:column}.diagnostic-result-actions>a{width:100%;flex:none}.learning-content-card:before{left:16px}.learning-content-card h4{margin:15px 0 12px;font-size:25px}.learning-content-label{font-size:12px}.learning-content-label>b{padding:5px 7px;font-size:12px}.learning-card-section{padding:13px}.learning-card-section p{font-size:13px;line-height:1.55}.learning-quantity-hero{grid-template-columns:minmax(96px,.8fr) minmax(0,1.2fr)}.learning-quantity-hero>div{min-height:88px;padding:12px}.learning-content-card .content-open-action{min-height:50px}.learning-variable-guide summary{min-height:46px}.learning-guest-entry{min-height:auto;padding:48px max(16px,env(safe-area-inset-right)) 58px max(16px,env(safe-area-inset-left));grid-template-columns:1fr;gap:34px}.learning-entry-copy h1{font-size:clamp(45px,14vw,59px)}.learning-entry-copy>p:not(.eyebrow){margin-top:20px;font-size:14px}.learning-entry-steps{grid-template-columns:1fr}.learning-entry-steps li,.learning-entry-steps li:first-child{min-height:82px;padding:13px 0;border-right:0;border-bottom:1px solid #c8c2b7}.learning-entry-steps li:last-child{border-bottom:0}.learning-entry-actions{padding:22px 18px}.learning-entry-actions h2{font-size:27px}.guest-learning-status{margin:12px max(10px,env(safe-area-inset-right)) 12px max(10px,env(safe-area-inset-left));align-items:flex-start;flex-direction:column;gap:9px}.guest-learning-status p{text-align:left}.learning-next-action{width:100%;min-height:52px}.learning-hero{min-height:auto;padding:54px max(18px,env(safe-area-inset-right)) 58px max(18px,env(safe-area-inset-left));grid-template-columns:1fr;align-items:start}.learning-hero h1{font-size:clamp(46px,14vw,58px)}.learning-hero-copy{margin-top:22px;font-size:15px}.learning-coming-soon{min-height:auto;grid-template-columns:1fr;padding-top:72px;padding-bottom:82px}.learning-release-card{padding:21px}.learning-hero:before{-webkit-mask-image:linear-gradient(180deg,transparent,black 40%,black);mask-image:linear-gradient(180deg,transparent,black 40%,black)}.mastery-panel{padding:21px}.learning-overview{max-width:430px}.mastery-progress-copy{align-items:flex-start;flex-direction:column;gap:4px}.learning-course-mode{height:calc(100dvh - 66px - env(safe-area-inset-bottom));min-height:0;display:grid;grid-template-rows:64px minmax(0,1fr);overflow:hidden}.learning-course-mode>.topbar{position:relative}.learning-course-mode>footer{display:none}.learning-course-mode>.achievement-shelf{width:100%;height:100%;min-height:0;padding:10px max(12px,env(safe-area-inset-right)) 8px max(12px,env(safe-area-inset-left));display:grid;grid-template-rows:auto minmax(0,1fr) auto;overflow:hidden}.achievement-shelf>header{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:9px}.achievement-shelf .eyebrow{margin-bottom:5px;font-size:12px}.achievement-shelf h2{font-size:clamp(26px,8vw,32px);line-height:1}.achievement-shelf-actions{display:block}.achievement-shelf-actions p{display:none}.achievement-shelf-actions button{min-height:40px;padding:0 10px;gap:12px;font-size:12px}.achievement-list{min-height:0;height:100%;margin-top:8px;grid-template-columns:1fr;grid-template-rows:repeat(5,minmax(0,1fr));gap:5px;overflow:hidden;padding:0}.achievement-list article{min-height:0;padding:6px 8px;grid-template-columns:28px minmax(0,1fr);grid-template-rows:minmax(0,1fr) 3px;gap:4px 8px;border-radius:8px}.achievement-symbol{width:28px;height:28px;font-size:14px}.achievement-copy{align-content:center;grid-template-columns:auto minmax(0,1fr);gap:1px 7px}.achievement-copy span{align-self:center;font-size:12px}.achievement-copy b{align-self:center}.achievement-copy b,.achievement-copy p{overflow:hidden;font-size:12px;text-overflow:ellipsis;white-space:nowrap}.achievement-copy p{grid-column:1/-1;line-height:1.2}.achievement-progress{height:3px}.achievement-total{margin-top:4px;font-size:12px;text-align:left}.learning-workspace,.learning-workspace.empty{height:calc(100dvh - 168px - env(safe-area-inset-bottom));min-height:0;display:grid;grid-template-columns:1fr;position:relative;overflow:hidden;scroll-margin-top:64px}.learning-course-mode>.learning-workspace,.learning-course-mode>.learning-workspace.empty{width:100%;height:100%;min-height:0}.course-map{width:100%;height:100%;max-height:none;padding:0 18px 36px;overflow-y:auto;visibility:hidden;position:absolute;inset:0;z-index:12;border-right:0;border-bottom:0;overscroll-behavior:contain;transform:translateX(-102%);transition:transform .24s ease,visibility 0s linear .24s}.course-map.mobile-open{visibility:visible;transform:translateX(0);box-shadow:18px 0 42px rgba(10,18,29,.28);transition-delay:0s}.mobile-course-map-close{width:calc(100% + 36px);min-height:64px;margin:0 -18px 16px;padding:0 12px 0 18px;display:flex;align-items:center;justify-content:space-between;gap:14px;position:sticky;top:0;z-index:4;border:0;border-bottom:1px solid #52606e;background:rgba(23,32,43,.98);color:white;cursor:pointer;font-size:13px;font-weight:700;text-align:left;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.mobile-course-map-close>span{min-width:0;overflow:hidden;letter-spacing:.02em;text-overflow:ellipsis;white-space:nowrap}.mobile-course-map-close b{flex:0 0 auto}.course-map-head{justify-content:flex-end}.course-map-head p{display:none}.mobile-course-map-close b{min-height:40px;padding:0 11px 0 8px;display:inline-flex;align-items:center;gap:5px;border-radius:8px;background:var(--lime);color:var(--ink);font-size:12px;font-weight:700}.mobile-course-map-close b span{font-size:23px;font-weight:500;line-height:1}.mobile-course-map-close:active b{background:white}.course-module>button{min-height:48px}.lesson-stage,.lesson-stage-empty{width:100%;height:100%;min-height:0;padding:0;overflow:hidden}.mobile-lesson-deck{height:100%;display:grid;grid-template-rows:minmax(0,1fr) 58px}.mobile-lesson-track{min-width:0;min-height:0;display:flex;gap:0;overflow-x:auto;overflow-y:hidden;scroll-snap-type:x mandatory;scrollbar-width:none;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch}.mobile-lesson-track::-webkit-scrollbar{display:none}.mobile-lesson-slide{width:100%;min-width:100%;height:100%;padding:26px max(16px,env(safe-area-inset-right)) 30px max(16px,env(safe-area-inset-left));display:block;overflow-x:hidden;overflow-y:auto;scroll-snap-align:start;scroll-snap-stop:always;overscroll-behavior-y:contain}.mobile-lesson-slide:has(.lesson-overview-slide){padding:12px max(12px,env(safe-area-inset-right)) 12px max(12px,env(safe-area-inset-left));overflow-y:hidden}.mobile-lesson-track:focus-visible{outline-offset:-3px}.mobile-lesson-controls{min-width:0;padding:5px max(10px,env(safe-area-inset-right)) 5px max(10px,env(safe-area-inset-left));display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:10px;border-top:1px solid #c9c3b8;background:rgba(255,254,250,.96);box-shadow:0 -9px 24px rgba(23,32,43,.07)}.mobile-course-map-toggle{min-height:44px;padding:0 11px;display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);cursor:pointer;font-size:12px;font-weight:700}.mobile-course-map-toggle span{color:var(--blue);font-size:14px}.mobile-lesson-controls>p{min-width:0;margin:0;display:grid;place-items:center;text-align:center}.mobile-lesson-controls>p span{color:var(--blue);font-size:12px;font-weight:700}.mobile-lesson-controls>div{display:flex;align-items:center;gap:5px}.mobile-lesson-controls>div:not(.mobile-lesson-leading) button{width:44px;height:44px;display:grid;place-items:center;border:0;border-radius:8px;background:var(--ink);color:var(--lime);cursor:pointer;font-size:17px}.mobile-lesson-controls>div:not(.mobile-lesson-leading) button:disabled{background:#e2ddd3;color:#9a9388;cursor:default}.learning-start-state{min-height:100%;padding:24px 0}.learning-empty-state{min-height:100%;padding:20px 0}.learning-start-state h2,.lesson-stage h2{font-size:clamp(36px,11vw,48px)}.learning-empty-mark{position:static;margin-bottom:44px}.learning-content-types{grid-template-columns:1fr}.learning-content-types>div,.learning-content-types>div:first-child{min-height:138px;padding:22px 0;border-right:0;border-bottom:1px solid #c9c3b8}.learning-content-types>div:last-child{border-bottom:0}.lesson-content-slide{margin-top:0}.lesson-content-slide .learning-content-card{height:auto;min-height:100%}.lesson-content-slide .lesson-check-locked,.lesson-content-slide .lesson-hidden-count{margin-top:12px}.lesson-overview-slide{height:100%;min-height:0;display:grid;grid-template-rows:auto auto auto;align-content:center;gap:9px;overflow:hidden}.lesson-stage-head{padding-bottom:9px;align-items:flex-start;flex-direction:row;gap:8px}.lesson-stage-head>div{min-width:0}.lesson-stage-head>div>p:last-child{max-height:2.8em;margin:5px 0 0;overflow:hidden;font-size:12px;line-height:1.4}.lesson-stage-head>span{padding:5px 7px;font-size:12px}.lesson-overview-slide .lesson-stage-head h2{overflow:hidden;font-size:clamp(26px,8vw,34px);line-height:1;text-overflow:ellipsis;white-space:nowrap}.lesson-mission{margin-top:0;padding:9px;grid-template-columns:32px minmax(0,1fr) auto;gap:8px}.mission-pulse{width:32px;height:32px;font-size:16px}.mission-copy h3{overflow:hidden;font-size:13px;text-overflow:ellipsis;white-space:nowrap}.mission-copy p{max-height:2.6em;overflow:hidden;font-size:12px;line-height:1.3}.lesson-mission>strong{width:max-content;grid-column:auto;padding:6px 7px;font-size:12px}.lesson-route{margin-top:0;padding:7px 8px 9px;grid-template-columns:repeat(3,minmax(0,1fr));gap:4px}.lesson-route>div:not(.lesson-route-meter){min-width:0;padding:4px 2px;gap:5px}.lesson-route i{width:22px;height:22px;font-size:12px}.lesson-route span{min-width:0}.lesson-route b{overflow:hidden;font-size:12px;text-overflow:ellipsis;white-space:nowrap}.lesson-route small{font-size:12px}.lesson-route-meter{grid-column:1/-1}.lesson-activities,.lesson-problems{margin-top:0}.lesson-problems{padding-top:0;border-top:0}.knowledge-checkpoint{padding:18px}.checkpoint-head{flex-direction:column;gap:13px}.checkpoint-head>strong{min-width:58px}.checkpoint-rules b{width:max-content;margin-left:0}.checkpoint-complete{grid-template-columns:auto minmax(0,1fr)}.checkpoint-complete>strong{width:max-content;grid-column:2}.checkpoint-complete-actions{grid-column:1/-1;flex-direction:column}.checkpoint-complete-actions a,.checkpoint-complete-actions button{width:100%;min-width:0;min-height:48px}.lesson-completion-summary{margin-top:0;padding:16px}.lesson-completion-summary>header{gap:10px}.lesson-completion-summary h3{font-size:20px}.lesson-completion-summary>header>strong{padding:6px 8px;font-size:12px}.lesson-outline-list{grid-template-columns:minmax(0,1fr);margin-block:14px}.lesson-outline-list>li{min-height:54px}.lesson-continue-button{min-height:72px}.account-progress-summary{grid-template-columns:repeat(2,1fr)}.account-progress-summary>div:nth-child(2){border-right:0}.account-progress-summary>div:nth-child(-n+2){border-bottom:1px solid var(--line)}.problem-answer-heading{flex-direction:column;gap:12px}.problem-options{grid-template-columns:1fr}.content-open-action,.learning-activity>button,.problem-attempt>button,.reset-button{min-height:44px}.knowledge-checkpoint,.learning-activity,.problem-attempt{padding:17px}.learning-problem>summary{padding:15px}.problem-body{padding:0 15px 17px}.problem-history li{grid-template-columns:1fr;gap:5px}.problem-success{grid-template-columns:auto minmax(0,1fr)}.problem-success>strong{width:max-content;grid-column:2}.account-shell,.teacher-heading{grid-template-columns:1fr}.account-shell{min-height:0;padding:52px max(16px,env(safe-area-inset-right)) 64px max(16px,env(safe-area-inset-left));gap:34px}.account-intro h1,.teacher-heading h1{font-size:clamp(46px,14vw,60px)}.account-card{padding:18px}.account-recovery-offer{align-items:stretch;flex-direction:column}.account-recovery-offer>button{width:100%}.account-recovery-actions{display:grid;grid-template-columns:1fr}.verification-shell{padding-top:36px}.verification-card{padding:22px 18px}.verification-actions{grid-template-columns:1fr}.account-card input,.create-group input,.inline-form input,.owner-search input,.search input,.setting-card input{font-size:16px}.teacher-heading{gap:36px}.inline-form{grid-template-columns:1fr}.teacher-shell{min-height:0;padding:46px max(16px,env(safe-area-inset-right)) 64px max(16px,env(safe-area-inset-left))}.teacher-group>header{align-items:flex-start;flex-direction:column;gap:16px}.join-code{text-align:left}.student-table{padding:12px;overflow:visible}.student-row.table-head{display:none}.student-row:not(.table-head){min-width:0;margin-bottom:10px;padding:15px;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px;border:1px solid var(--line);border-radius:11px;background:#fffefa}.student-row:not(.table-head) span{display:grid;gap:4px}.student-row:not(.table-head) span:first-child{grid-column:1/-1}.student-row:not(.table-head) span:before{content:attr(data-label);color:#8b8478;font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase}.owner-shell{min-height:0;padding:46px max(16px,env(safe-area-inset-right)) 70px max(16px,env(safe-area-inset-left))}.owner-heading,.owner-students>header{align-items:stretch;flex-direction:column}.owner-heading h1{font-size:clamp(46px,14vw,60px)}.owner-refresh{width:100%}.owner-metrics{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.owner-metrics article{min-height:136px;padding:16px}.owner-metrics strong{font-size:35px}.owner-chart-card,.owner-traffic-card{min-height:280px;padding:18px}.owner-chart-card>header{align-items:flex-start;flex-direction:column;gap:10px}.owner-bars{height:170px;gap:3px}.owner-bar-day>span{writing-mode:vertical-rl;transform:rotate(180deg)}.owner-students{margin-top:38px}.owner-search{width:100%}.owner-student-list{grid-template-columns:1fr}.owner-student{padding:17px}.owner-student>header{align-items:flex-start;flex-direction:column}.owner-student dl{grid-template-columns:repeat(2,minmax(0,1fr))}.owner-delete-confirm>div{grid-template-columns:1fr}.learning-page.learning-course-mode.learning-achievement-mode{height:auto;min-height:calc(100dvh - 66px - env(safe-area-inset-bottom));display:block;overflow:visible}.learning-page.learning-course-mode.learning-achievement-mode>.topbar{position:sticky}.learning-page.learning-course-mode.learning-achievement-mode>footer{display:grid}.achievement-hub{padding:25px max(13px,env(safe-area-inset-right)) calc(28px + env(safe-area-inset-bottom)) max(13px,env(safe-area-inset-left))}.achievement-hub-heading{align-items:start;gap:12px}.achievement-hub-heading h1{font-size:clamp(34px,10vw,42px)}.achievement-hub-heading p:not(.eyebrow){margin-top:8px;font-size:12px}.achievement-hub-total{min-width:78px;padding:8px 9px;gap:5px;border-radius:11px}.achievement-hub-total b{font-size:23px}.achievement-hub-total small{font-size:12px}.achievement-hub-hero{min-height:0;margin-top:18px;padding:20px 17px;grid-template-columns:minmax(0,1fr) 118px;gap:5px;border-radius:18px}.achievement-hub-hero h1{margin-top:7px;font-size:clamp(23px,7.4vw,30px)}.achievement-hub-hero h1+p{max-width:215px;margin-top:9px;font-size:12px}.achievement-hero-xp{margin-top:16px}.achievement-hero-xp strong{font-size:12px}.achievement-hero-xp>i{height:7px;margin-top:7px}.achievement-hero-lesson{min-height:44px;margin-top:17px;padding-inline:11px;font-size:12px}.achievement-hero-emblem{min-height:144px}.achievement-hero-emblem .achievement-emblem{width:123px;height:123px}.achievement-level-number{width:29px;height:29px;right:0;bottom:4px;font-size:12px}.achievement-hero-orbit{width:130px;height:130px;right:0}.achievement-collection,.trophy-collection,.upcoming-achievements{margin-top:28px}.achievement-section-heading{align-items:start;gap:14px}.achievement-section-heading h2{font-size:27px}.achievement-filters{margin-top:13px;padding-bottom:2px}.achievement-filters button{min-height:34px;padding:0 11px;font-size:12px}.achievement-grid{margin-top:12px;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.achievement-card{min-height:202px;padding:9px;border-radius:13px}.achievement-card-topline{min-height:13px}.achievement-card>.achievement-emblem{margin-top:3px}.achievement-card .achievement-emblem{width:58px;height:58px}.achievement-tier{gap:3px;font-size:12px}.achievement-tier i{width:5px;height:5px}.achievement-lock{transform:scale(.84);transform-origin:right top}.achievement-card-copy{margin-top:4px;gap:3px}.achievement-card-copy strong{font-size:12px}.achievement-card-copy small{min-height:24px;font-size:12px;line-height:1.35}.achievement-card-state{gap:4px}.achievement-card-state b{font-size:12px}.trophy-collection{padding:17px 11px;border-radius:16px}.trophy-collection-grid{margin-top:12px}.trophy-collection-card{min-height:111px;padding:4px 8px;grid-template-columns:1fr;grid-template-rows:50px auto auto;gap:2px;justify-items:center;text-align:center}.trophy-collection-card .achievement-emblem{transform:scale(.72);transform-origin:center bottom}.trophy-collection-card>span{justify-items:center;gap:2px}.trophy-collection-card b{font-size:13px}.trophy-collection-card small{font-size:12px;line-height:1.3}.trophy-collection-card>i{grid-column:auto;font-size:12px}.upcoming-achievements-list{margin-top:12px;border-radius:14px}.upcoming-achievements-list>button{min-height:69px;padding:8px 9px;grid-template-columns:38px minmax(0,1fr) auto 14px;gap:7px}.upcoming-achievements-list>button>.achievement-emblem{width:38px;height:38px}.upcoming-achievements-list>button>i{grid-column:2;grid-row:2;height:4px}.upcoming-achievements-list>button>strong{grid-column:3;grid-row:1/span 2;font-size:12px}.upcoming-achievements-list b,.upcoming-achievements-list small{font-size:12px}.upcoming-achievements-list>button>em{grid-column:4;grid-row:1/span 2;font-size:14px}.achievement-dialog-backdrop,.achievement-unlock-backdrop{padding:13px;align-items:end}.achievement-detail{width:100%;max-height:calc(100dvh - 90px);padding:22px 17px calc(19px + env(safe-area-inset-bottom));border-radius:21px 21px 16px 16px}.achievement-detail>.achievement-emblem{width:125px;height:125px}.achievement-detail-heading h2{font-size:25px}.achievement-detail-facts{margin-top:16px}.achievement-detail-facts div{min-height:44px;grid-template-columns:76px minmax(0,1fr)}.achievement-unlock{width:100%;padding:24px 17px calc(18px + env(safe-area-inset-bottom));border-radius:21px 21px 16px 16px}.achievement-unlock>.achievement-emblem{width:137px;height:137px}.achievement-unlock h2{font-size:29px}.achievement-unlock-rewards>div{min-height:61px;padding:8px 3px}.achievement-unlock-rewards small,.achievement-unlock-rewards span{font-size:12px}.achievement-unlock-actions>*{min-height:42px;padding-inline:7px;font-size:12px}}@media (max-width:720px) and (max-height:500px){.portal-choice{padding-block:8px}.portal-choice-intro{display:none}.portal-choice-grid{gap:8px;grid-template-rows:repeat(2,minmax(0,1fr))}.portal-choice-card{min-height:0;padding:8px 12px}.portal-choice-symbol{display:none}.portal-choice-copy{margin-top:auto}.portal-choice-copy strong{font-size:19px}.portal-choice-action{min-height:30px;padding-top:5px}}@media (max-width:380px){.topbar nav{padding-inline:1px}.topbar nav a{padding:0;letter-spacing:-.6px}.learning-overview,.owner-metrics{grid-template-columns:1fr}.learning-overview div{min-height:64px;padding:13px 0;border-right:0;border-bottom:1px solid #354252}.platinum-showcase{grid-template-columns:auto minmax(0,1fr);grid-template-areas:"emblem copy" "state state";padding:18px;gap:12px 16px}.platinum-showcase .achievement-emblem{grid-area:emblem}.platinum-showcase-copy{grid-area:copy}.platinum-showcase-state{grid-area:state;text-align:left}.platinum-showcase-progress{width:100%}.trophy-collection-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.trophy-collection-card{border-right:1px solid #e4ded1;border-bottom:1px solid #e4ded1}.trophy-collection-card:nth-child(2n){border-right:0}.trophy-collection-card:last-child{border-bottom:0}}.learning-content-card{border-color:#e0e3e8;background:linear-gradient(145deg,#fffefa 0,#ffffff 58%,color-mix(in srgb,var(--kind-soft) 36%,white) 100%);box-shadow:0 10px 28px rgba(23,32,51,.045),inset 0 1px 0 rgba(255,255,255,.86)}.learning-content-card:before{opacity:.88;box-shadow:0 3px 10px color-mix(in srgb,var(--kind) 17%,transparent)}.learning-content-card:hover{border-color:color-mix(in srgb,var(--kind) 40%,#dfe4eb);box-shadow:0 14px 30px color-mix(in srgb,var(--kind) 12%,transparent),inset 0 1px 0 rgba(255,255,255,.9)}.learning-content-card.opened{border-color:color-mix(in srgb,var(--kind) 28%,#dfe4eb);animation:learning-card-reveal .22s ease-out}.learning-content-label>b{border:1px solid color-mix(in srgb,#789c25 18%,transparent);box-shadow:inset 0 1px 0 rgba(255,255,255,.72)}.learning-card-section{border:0;border-radius:12px;background:#f8fafc}.learning-card-section.primary{background:color-mix(in srgb,var(--kind-soft) 47%,white)}.learning-card-section.insight{border:0}.learning-variable-guide{border-color:#e2e6eb}.achievement-card{background:radial-gradient(circle at 88% 7%,color-mix(in srgb,var(--rarity-color) 12%,transparent),transparent 31%),linear-gradient(145deg,#fff 0,#fff 64%,color-mix(in srgb,var(--rarity-color) 5%,white) 100%)}.achievement-card:before{content:"";width:78px;height:78px;position:absolute;right:-38px;top:28px;z-index:0;border:1px solid color-mix(in srgb,var(--rarity-color) 18%,transparent);border-radius:50%;box-shadow:0 0 0 11px color-mix(in srgb,var(--rarity-color) 5%,transparent);pointer-events:none}.achievement-card>*{position:relative;z-index:1}.achievement-card>.achievement-emblem{margin:7px auto 0}.achievement-card:hover .achievement-emblem{transform:translateY(-2px) scale(1.035)}.achievement-card-locked{background:linear-gradient(145deg,#fafbfc,#f2f4f7)}.achievement-card-locked:before{opacity:.42}.achievement-card-locked:hover .achievement-emblem{transform:none}.achievement-card-copy strong{letter-spacing:-.018em}.achievement-card-state{padding-top:8px;border-top:1px solid color-mix(in srgb,var(--rarity-color) 11%,#e9edf1)}.trophy-collection-card{position:relative;overflow:hidden;border-radius:13px;transition:background .2s ease,transform .2s ease}.trophy-collection-card:before{content:"";width:74px;height:74px;position:absolute;left:9px;top:50%;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--trophy-mid) 14%,transparent),transparent 66%);transform:translateY(-50%);pointer-events:none}.trophy-collection-card>*{position:relative;z-index:1}.trophy-collection-card:hover{background:color-mix(in srgb,var(--trophy-light) 9%,white);transform:translateY(-1px)}.trophy-collection-card.locked:hover{transform:none}.learning-variable-guide summary:hover{background:color-mix(in srgb,var(--kind-soft) 72%,white)}.learning-formula-stage{border-color:color-mix(in srgb,var(--kind) 17%,#e1e5ea);background:linear-gradient(135deg,var(--kind-soft),#fffefa)}.learning-formula{padding-block:15px;text-align:center}.learning-formula .katex{font-size:clamp(22px,3vw,29px)}.content-open-action{min-height:50px!important}.learning-options label{min-height:54px;padding:12px 13px;position:relative;border-color:#dfe4eb;border-radius:11px;transition:border-color .2s ease,background .2s ease,box-shadow .2s ease,transform .2s ease}.learning-options label:hover{border-color:#a9bdf4;background:#f8faff}.learning-options label.selected{border-color:var(--blue);background:#eef3ff;box-shadow:0 0 0 3px rgba(35,72,219,.08)}.learning-options label.correct{border-color:#89aa44;background:#eff7df;color:#405c14}.learning-options label.wrong{border-color:#df9e88;background:#fff1ec;color:#823d28;animation:learning-answer-shake .2s ease-in-out}.learning-options label>b{width:22px;height:22px;margin-left:auto;display:grid;place-items:center;border-radius:50%;background:currentColor;color:white;font-size:12px}.learning-feedback{border:1px solid transparent;border-radius:11px}.learning-feedback.correct{border-color:#bfd594}.learning-feedback.wrong{border-color:#efc2b2}.learning-activity-feedback-card{border:0;background:#f2f8e4}.learning-activity-feedback-card>button{background:var(--ink)}.checkpoint-head>strong{min-width:78px;padding:12px 10px;color:var(--lime);font-size:24px;line-height:1}.checkpoint-map{padding:13px 0 2px;border-top:1px solid #354252}.checkpoint-rules{margin-top:11px;padding-bottom:14px}.checkpoint-start{margin-top:18px;padding:18px;border-radius:13px;background:rgba(255,255,255,.06)}.checkpoint-start p{max-width:540px;margin:0;color:#c7d1dc;font-size:12px;line-height:1.55}.checkpoint-start button{width:100%;min-height:48px;margin-top:16px;border:0;border-radius:10px;background:var(--lime);color:var(--ink);font-size:12px;font-weight:700}.checkpoint-start button:hover{background:white}.checkpoint-complete{border:0;border-radius:15px}.problem-kicker{color:var(--blue)!important;font-size:12px!important;font-weight:700;letter-spacing:.11em}.learning-problem{border-color:#e0e4ea;border-radius:15px;background:#fffefa;box-shadow:0 9px 24px rgba(23,32,51,.035)}.learning-problem>summary{padding:18px}.problem-body{border-top-color:#e6e9ee}.problem-condition{border:0;background:#f7f9fc}.problem-attempt{border-radius:13px;background:#f0f3f8}.problem-options label{border-color:#dce2ea;background:white}.problem-options label.selected{border-color:var(--blue);background:#eef3ff;box-shadow:0 0 0 3px rgba(35,72,219,.08)}.problem-options label>b{width:20px;height:20px;display:grid;place-items:center;border-radius:50%;background:var(--blue);color:white;font-size:12px}.learning-notes-filters{margin:0 0 17px;display:flex;flex-wrap:wrap;gap:7px;overflow-x:auto;scrollbar-width:none}.learning-notes-filters::-webkit-scrollbar{display:none}.learning-notes-filters button{min-height:34px;padding:0 11px;flex:0 0 auto;border:1px solid #dce2ea;border-radius:999px;background:white;color:var(--muted);cursor:pointer;font-size:12px;font-weight:700}.learning-notes-filters button.active{border-color:var(--blue);background:#edf2ff;color:var(--blue)}.learning-notes-no-results{margin:22px 4px;color:var(--muted);font-size:12px;text-align:center}.solution-sheet{padding:18px;border:1px solid var(--line);border-radius:14px;background:white}.solution-sheet-heading{margin:0 0 14px;color:var(--blue);font-size:14px;font-weight:700;letter-spacing:.01em}.solution-sheet-body{display:grid;grid-template-columns:minmax(0,1fr);gap:20px}.solution-column-label{display:block;color:var(--muted);font-size:13px;font-weight:700;letter-spacing:.01em}.solution-given{padding:0 0 16px;border-bottom:1px solid var(--line)}.solution-given dl{margin:9px 0 0;display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:7px 18px}.solution-given dl>div{display:flex;align-items:baseline;flex-wrap:wrap;gap:6px}.solution-given dt{margin:0;color:var(--ink)}.solution-given dt:after{content:"=";margin-left:6px;color:var(--muted)}.solution-given dd{margin:0;display:flex;align-items:baseline;flex-wrap:wrap;gap:6px}.solution-converted{display:inline-flex;align-items:baseline;gap:5px;color:var(--muted)}.solution-converted i{font-style:normal}.solution-find{margin-top:14px;padding-top:12px;border-top:1px dashed var(--line)}.solution-find p{margin:8px 0 0;display:flex;flex-wrap:wrap;gap:12px}.solution-find p>span{display:inline-flex;align-items:baseline}.solution-find i{margin-left:5px;font-style:normal;color:var(--muted)}.solution-steps{margin:0;padding-left:0;display:grid;gap:15px;list-style:none;counter-reset:solution-step}.solution-steps>li{padding-left:32px;display:grid;gap:5px;position:relative}.solution-steps>li:before{counter-increment:solution-step;content:counter(solution-step);width:24px;height:24px;display:grid;place-items:center;position:absolute;left:0;top:0;border-radius:50%;background:#edf2ff;color:var(--blue);font-size:13px;font-weight:700}.solution-step-formula,.solution-step-substitution{width:100%;max-width:100%;justify-self:stretch}.solution-step-substitution{color:var(--muted)}.solution-step-result{width:100%;max-width:100%;padding:7px 11px;justify-self:stretch;border-radius:8px;background:#f1f5ff;color:var(--blue)}.solution-step-note{margin:4px 0 0;color:#5f5a52;font-size:14px;line-height:1.5}.solution-answer{margin:18px 0 0;padding-top:15px;display:flex;align-items:baseline;flex-wrap:wrap;gap:12px;border-top:2px solid var(--ink)}.solution-answer>span{color:var(--ink);font-size:14px;font-weight:700;letter-spacing:.01em}.solution-sheet .katex{font-size:15px}.solution-answer .katex{font-size:16px}.solution-trainer{margin-top:14px;padding:18px;border:1px solid rgba(36,85,214,.22);border-radius:14px;background:#f7f9ff}.solution-trainer-head{margin-bottom:14px;display:flex;align-items:start;justify-content:space-between;flex-wrap:wrap;gap:12px}.solution-trainer-head .eyebrow{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.12em}.solution-trainer-head h4{margin:4px 0 0;font-size:16px;letter-spacing:-.02em}.solution-trainer-score{margin:0;padding:5px 10px;border-radius:999px;background:white;color:var(--muted);font-size:12px;font-weight:700;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.solution-trainer-modes{display:flex;flex-wrap:wrap;gap:6px}.solution-trainer-modes button{min-height:44px;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid #dce2ea;border-radius:999px;background:white;color:var(--muted);cursor:pointer;font-size:14px;font-weight:700;transition:border-color .15s ease,background .15s ease,color .15s ease}.solution-trainer-modes button:hover{border-color:var(--blue);color:var(--blue)}.solution-trainer-modes button.active{border-color:var(--blue);background:var(--blue);color:white}.solution-trainer-modes button.done{border-color:#9ec4ac}.solution-trainer-modes button.done.active{border-color:var(--blue)}.solution-trainer-modes button i{width:15px;height:15px;display:grid;place-items:center;border-radius:50%;background:#e8f3ec;color:#2c6b3f;font-style:normal;font-size:12px;font-weight:700}.solution-trainer-modes button.active i{background:rgba(255,255,255,.24);color:white}.solution-trainer-body{margin-top:15px}.solution-trainer-hint{margin:0 0 12px;color:var(--muted);font-size:12px;line-height:1.55}.solution-chip-grid{display:flex;flex-wrap:wrap;gap:8px}.solution-chip{min-height:44px;padding:0 13px;display:inline-flex;align-items:center;gap:7px;border:1px solid #dce2ea;border-radius:11px;background:white;color:var(--ink);cursor:pointer}.solution-chip i{font-style:normal;color:var(--muted)}.solution-chip.selected{border-color:var(--blue);background:#edf2ff}.solution-chip.right{border-color:#2c6b3f;background:#e8f3ec}.solution-chip.wrong{border-color:#a3352c;background:#fbeae8}.solution-gap-list{margin:0;padding-left:0;display:grid;gap:16px;list-style:none;counter-reset:solution-gap}.solution-gap-list>li{padding-left:32px;display:grid;gap:7px;position:relative}.solution-gap-list>li:before{counter-increment:solution-gap;content:counter(solution-gap);width:24px;height:24px;display:grid;place-items:center;position:absolute;left:0;top:6px;border-radius:50%;background:#edf2ff;color:var(--blue);font-size:13px;font-weight:700}.solution-gap-options{display:flex;flex-wrap:wrap;gap:7px}.solution-gap-option{min-height:44px;min-width:84px;padding:6px 12px;max-width:100%;border:1px solid #dce2ea;border-radius:10px;background:white;cursor:pointer}.solution-gap-option.selected{border-color:var(--blue);background:#edf2ff}.solution-gap-option.right{border-color:#2c6b3f;background:#e8f3ec}.solution-gap-option.wrong{border-color:#a3352c;background:#fbeae8}.solution-order-list{margin:0;padding:0;display:grid;gap:8px;list-style:none}.solution-order-list>li{padding:9px 11px;display:grid;grid-template-columns:24px minmax(0,1fr) auto;align-items:center;gap:11px;border:1px solid #dce2ea;border-radius:11px;background:white}.solution-order-list>li.right{border-color:#9ec4ac;background:#f2f9f4}.solution-order-list>li.wrong{border-color:#d9a49e;background:#fdf4f3}.solution-order-index{width:24px;height:24px;display:grid;place-items:center;border-radius:50%;background:#edf2ff;color:var(--blue);font-size:12px;font-weight:700}.solution-order-formula{min-width:0;text-align:left}.solution-order-formula .katex-display{margin:0;text-align:left}.solution-order-controls{display:flex;gap:4px}.solution-order-controls button{width:44px;height:44px;display:grid;place-items:center;border:1px solid #dce2ea;border-radius:10px;background:white;color:var(--ink);cursor:pointer;font-size:16px;line-height:1}.solution-order-controls button:hover:not(:disabled){border-color:var(--blue);color:var(--blue)}.solution-order-controls button:disabled{cursor:not-allowed;opacity:.35}.solution-answer-fields{display:grid;gap:9px}.solution-answer-field{padding:9px 12px;display:grid;grid-template-columns:minmax(44px,max-content) minmax(0,210px) minmax(0,1fr);align-items:center;gap:11px;border:1px solid #dce2ea;border-radius:11px;background:white}.solution-answer-field.right{border-color:#9ec4ac;background:#f2f9f4}.solution-answer-field.wrong{border-color:#d9a49e;background:#fdf4f3}.solution-answer-label{min-width:0;color:var(--ink)}.solution-answer-field input{min-height:46px;width:100%;padding:0 11px;border:1px solid #dce2ea;border-radius:9px;background:#fbfcfe;color:var(--ink);font-family:inherit;font-size:16px;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.solution-answer-field input:focus-visible{border-color:var(--blue);outline:2px solid rgba(36,85,214,.25);outline-offset:1px}.solution-answer-side{display:inline-flex;align-items:center;gap:9px}.solution-answer-exponent{min-width:52px;min-height:44px;padding:0 11px;border:1px solid #dce2ea;border-radius:9px;background:#f6f8fc;color:var(--muted);cursor:pointer;font-family:inherit;font-size:14px;font-weight:700;white-space:nowrap}.solution-answer-exponent:hover{border-color:var(--blue);color:var(--blue)}.solution-answer-unit{color:var(--muted);font-size:12px;white-space:nowrap}.solution-trainer-reveal{margin-top:11px;padding:10px 13px;border-left:3px solid var(--blue);border-radius:0 9px 9px 0;background:#eef3ff}.solution-trainer-reveal p{margin:0;color:#2c3d63;font-size:12px;line-height:1.55}.solution-trainer-verdict:focus-visible{outline:2px solid rgba(36,85,214,.35);outline-offset:2px}.solution-trainer-verdict b{font-weight:900;white-space:nowrap}.solution-trainer-actions{margin-top:15px;display:flex;align-items:center;flex-wrap:wrap;gap:10px}.solution-trainer-actions>button:first-child{min-height:44px;padding:0 16px;border:0;border-radius:9px;background:var(--ink);color:white;cursor:pointer;font-size:12px;font-weight:700}.solution-trainer-actions>button:first-child:disabled{cursor:not-allowed;opacity:.45}.solution-trainer-actions .text-action{min-height:44px;padding:0 6px;border:0;background:none;color:var(--muted);cursor:pointer;font-size:12px;font-weight:700;text-decoration:underline}.solution-trainer-verdict{margin:12px 0 0;padding:11px 13px;border-radius:10px;font-size:12px;line-height:1.5}.solution-trainer-verdict.right{background:#e8f3ec;color:#2c6b3f}.solution-trainer-verdict.wrong{background:#fbeae8;color:#a3352c}.solution-trainer-footnote{margin:14px 0 0;color:var(--muted);font-size:12px;line-height:1.5}.trainer-shell{display:grid;grid-template-columns:minmax(0,1fr);gap:22px}.trainer-hero{padding:26px 26px 24px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(180deg,#f7f9ff,white)}.trainer-hero .eyebrow{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.14em}.trainer-hero h1{margin:8px 0 0;font-size:clamp(23px,3.4vw,33px);letter-spacing:-.03em}.trainer-lead{margin:10px 0 0;max-width:62ch;color:var(--muted);font-size:13px;line-height:1.65}.trainer-counters{margin-top:16px;display:flex;flex-wrap:wrap;gap:8px}.trainer-counters span{padding:7px 12px;border:1px solid var(--line);border-radius:999px;background:white;color:var(--muted);font-size:12px;font-weight:700}.trainer-counters b{color:var(--ink);font-size:12px;font-weight:700;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.trainer-guest-note{margin:14px 0 0;color:var(--muted);font-size:12px;line-height:1.55}.trainer-guest-note a{color:var(--blue);font-weight:800;text-decoration:underline}.trainer-picker{min-width:0;padding:18px;border:1px solid var(--line);border-radius:16px;background:white}.trainer-filters{display:flex;align-items:center;flex-wrap:wrap;gap:10px}.trainer-filter-group{display:inline-flex;padding:3px;gap:3px;border:1px solid var(--line);border-radius:999px;background:#f6f8fc}.trainer-filter-group button{min-height:44px;padding:0 17px;border:0;border-radius:999px;background:none;color:var(--muted);cursor:pointer;font-size:14px;font-weight:700}.trainer-filter-group button.active{background:var(--blue);color:white}.trainer-filter-select{min-width:0;display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:12px;font-weight:700}.trainer-filter-select>span{flex:0 0 auto}.trainer-filter-select select{min-width:0;max-width:min(320px,60vw);padding:0 11px;border:1px solid var(--line);border-radius:10px;font-family:inherit;text-overflow:ellipsis}.trainer-filter-select select,.trainer-random{min-height:44px;background:white;color:var(--ink);font-size:14px}.trainer-random{margin-left:auto;padding:0 18px;border:1px solid var(--line);border-radius:999px;cursor:pointer;font-weight:700}.trainer-random:hover{border-color:var(--blue);color:var(--blue)}.trainer-problem-list{margin:15px 0 0;padding:0;max-height:232px;overflow-y:auto;display:grid;grid-template-columns:repeat(auto-fill,minmax(184px,1fr));gap:7px;list-style:none}.trainer-problem{width:100%;min-height:52px;padding:8px 11px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:9px;border:1px solid var(--line);border-radius:11px;background:white;color:var(--ink);cursor:pointer;text-align:left}.trainer-problem.active,.trainer-problem:hover{border-color:var(--blue)}.trainer-problem.active{background:#edf2ff}.trainer-problem b{font-size:12px;font-weight:700;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.trainer-problem span{overflow:hidden;color:var(--muted);font-size:12px;line-height:1.4;text-overflow:ellipsis;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2}.trainer-problem i{width:19px;height:19px;display:grid;place-items:center;border-radius:50%;background:#e8f3ec;color:#2c6b3f;font-style:normal;font-size:12px;font-weight:700}.trainer-stage{min-height:120px}.trainer-placeholder{margin:0;padding:34px 18px;border:1px dashed var(--line);border-radius:16px;color:var(--muted);font-size:12px;text-align:center}.trainer-card{min-width:0;padding:20px;border:1px solid var(--line);border-radius:18px;background:white}.trainer-card-head{display:flex;align-items:start;justify-content:space-between;flex-wrap:wrap;gap:12px}.trainer-card-head .eyebrow{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.12em}.trainer-card-head h2{margin:5px 0 0;font-size:19px;letter-spacing:-.02em}.trainer-card-score{margin:0;padding:6px 12px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:12px;font-weight:700}.trainer-card-score b{color:var(--ink);font-weight:900}.trainer-problem-condition{margin-top:16px;padding:15px 16px;scroll-margin-top:16px;border:1px solid #cbd69e;border-radius:13px;background:#f5f8e8;outline:none}.trainer-problem-condition:focus-visible{box-shadow:0 0 0 3px rgba(35,72,219,.22)}.trainer-problem-condition>header{margin-bottom:9px;display:flex;align-items:center;justify-content:space-between;gap:12px}.trainer-problem-condition>header span{color:#557218;font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.trainer-problem-condition>header small{overflow:hidden;color:#687451;font-size:12px;text-overflow:ellipsis;white-space:nowrap}.trainer-problem-condition>div{color:#293429;font-size:14px;line-height:1.62}.trainer-card .solution-trainer,.trainer-reference{margin-top:16px}.trainer-reference-toggle{min-height:44px;width:100%;padding:0 15px;border:1px solid var(--line);border-radius:11px;background:#fbfcfe;color:var(--ink);cursor:pointer;font-size:12px;font-weight:700}.trainer-reference-toggle:hover{border-color:var(--blue);color:var(--blue)}.trainer-reference .solution-sheet{margin-top:12px}.trainer-about{margin-top:30px}.trainer-about h2{margin:0 0 9px;font-size:18px;letter-spacing:-.02em}.trainer-about p{margin:0;max-width:70ch;color:var(--muted);font-size:13px;line-height:1.7}.trainer-about .seo-cross-links{margin-top:18px}.problem-solution{margin-top:12px;padding:13px 15px;border:1px solid #d4cfc4;border-radius:9px;background:rgba(255,255,255,.58)}.problem-solution>summary{min-height:26px;display:flex;align-items:center;cursor:pointer;color:var(--blue);font-size:12px;font-weight:700}.problem-solution[open]>summary{margin-bottom:13px}.seo-problem-solution{margin-top:14px;padding:4px 15px;border:1px solid var(--line);border-radius:10px;background:var(--paper)}.seo-problem-solution>summary{min-height:44px;display:flex;align-items:center;cursor:pointer;color:var(--blue);font-size:15px;font-weight:700}.seo-problem-solution[open]>summary{margin-bottom:13px}.seo-problem-solution>summary .seo-problem-solution-close,.seo-problem-solution[open]>summary .seo-problem-solution-open{display:none}.seo-problem-solution[open]>summary .seo-problem-solution-close{display:inline}.seo-problem-options-title{margin:14px 0 8px;color:var(--muted);font-size:14px;font-weight:700}.lesson-done-backdrop{display:grid;place-items:center;padding:20px;position:fixed;inset:0;z-index:95;background:rgba(14,23,38,.44);-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.lesson-done-panel{width:min(460px,100%);max-height:calc(100dvh - 40px);padding:28px 26px 24px;overflow-y:auto;border-radius:20px;background:var(--paper);box-shadow:0 30px 80px rgba(14,23,38,.32);text-align:center}.lesson-done-mark{width:58px;height:58px;margin:0 auto 16px;display:grid;place-items:center;border-radius:50%;background:var(--lime);color:var(--ink);font-size:27px;font-weight:800}.lesson-done-panel .eyebrow{margin:0;color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.12em}.lesson-done-panel h2{margin:7px 0 0;font-size:26px;line-height:1.1;letter-spacing:-.03em}.lesson-done-lead{margin:9px 0 0;color:var(--muted);font-size:12px;line-height:1.55}.lesson-done-prize{margin:20px 0 0;padding:14px 16px;display:flex;align-items:center;gap:13px;border-radius:13px;background:var(--ink);color:white;text-align:left}.lesson-done-prize>span{width:34px;height:34px;flex:0 0 34px;display:grid;place-items:center;border-radius:9px;background:var(--lime);color:var(--ink);font-size:17px}.lesson-done-prize b{display:block;font-size:14px}.lesson-done-prize small{display:block;margin-top:3px;color:#9fb0c6;font-size:12px;line-height:1.45}.lesson-done-stats{margin:14px 0 0;display:grid;gap:8px;text-align:left}.lesson-done-stats>div{padding:12px 14px;display:flex;align-items:baseline;justify-content:space-between;gap:14px;border:1px solid var(--line);border-radius:11px;background:white}.lesson-done-stats dt{margin:0;font-size:12px;font-weight:700}.lesson-done-stats dd{margin:0;display:flex;align-items:baseline;flex-wrap:wrap;gap:6px}.lesson-done-stats strong{color:var(--blue);font-size:17px;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.lesson-done-stats dd>span,.lesson-done-stats small{color:var(--muted);font-size:12px}.lesson-done-stats small{width:100%}.lesson-done-close{width:100%;min-height:48px;margin-top:20px;border:0;border-radius:11px;background:var(--blue);color:white;cursor:pointer;font-size:12px;font-weight:700}.lesson-done-close:hover{background:#1c46b8}.learning-notes-filters button{display:inline-flex;align-items:center;gap:5px}.learning-notes-filters button i{min-width:16px;height:16px;padding:0 4px;display:grid;place-items:center;border-radius:999px;background:#f0f3f8;color:var(--muted);font-size:12px;font-style:normal;font-weight:700}.learning-notes-filters button.active i{background:white;color:var(--blue)}.learning-notes-filters button:disabled{opacity:.45;cursor:not-allowed}button.learning-reference-trigger{width:100%;min-height:52px;margin:13px 0 0;padding:8px 10px;display:grid;grid-template-columns:32px minmax(0,1fr) auto;align-items:center;gap:10px;border:1px solid var(--line);border-radius:12px;background:white;color:var(--ink);cursor:pointer;text-align:left}.learning-reference-trigger:hover{border-color:var(--blue)}.learning-reference-trigger>span:first-child{width:32px;height:32px;display:grid;place-items:center;border-radius:9px;background:#edf2ff;color:var(--blue);font-family:Georgia,serif;font-size:19px;line-height:1}.learning-reference-trigger>span:nth-child(2){min-width:0;display:grid;gap:2px}.learning-reference-trigger b{font-size:12px}.learning-reference-trigger small{overflow:hidden;color:var(--muted);font-size:12px;text-overflow:ellipsis;white-space:nowrap}.learning-reference-trigger>strong{min-width:24px;height:24px;padding:0 6px;display:grid;place-items:center;border-radius:999px;background:var(--ink);color:var(--lime);font-size:12px}.learning-reference-list{display:grid;gap:8px}.learning-reference-entry{position:relative}.learning-reference-entry.is-key{border-color:rgba(36,85,214,.34);box-shadow:0 6px 18px rgba(35,72,219,.07)}.learning-reference-flag{padding:3px 7px;position:absolute;right:14px;top:14px;border-radius:999px;background:#edf2ff;color:var(--blue);font-size:12px;font-style:normal;font-weight:700;letter-spacing:.08em}@keyframes learning-card-reveal{0%{opacity:.72;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}@keyframes learning-answer-shake{0%,to{transform:translateX(0)}33%{transform:translateX(-3px)}66%{transform:translateX(3px)}}@media (max-width:720px){.learning-course-mode{grid-template-rows:64px minmax(0,1fr)}.learning-page.learning-course-mode:not(.learning-achievement-mode)>.learning-notes-trigger{display:none}.mobile-lesson-deck{grid-template-rows:minmax(0,1fr) 56px}.mobile-lesson-slide{padding-bottom:18px}.mobile-lesson-slide:has(.lesson-overview-slide){overflow-y:auto}.mobile-lesson-controls{min-height:56px;padding-block:5px;grid-template-columns:auto minmax(42px,1fr) auto;gap:7px}.mobile-lesson-leading{display:flex;align-items:center;gap:5px}.mobile-course-map-toggle{min-height:44px;padding-inline:9px}.mobile-notes-toggle{width:44px;height:44px;padding:0;display:grid;place-items:center;position:relative;border:1px solid #dce2ea;border-radius:9px;background:white;color:var(--ink);cursor:pointer;font-size:17px}.mobile-notes-toggle:disabled{opacity:.5;cursor:wait}.mobile-notes-toggle b{min-width:16px;height:16px;padding:0 3px;display:grid;place-items:center;position:absolute;right:-3px;top:-3px;border-radius:999px;background:#edf2ff;color:var(--blue);font-size:12px}.mobile-lesson-controls>p span{font-size:12px}.mobile-lesson-controls>div:not(.mobile-lesson-leading){gap:4px}.mobile-lesson-controls>div:not(.mobile-lesson-leading) button{width:44px;height:44px}.lesson-overview-slide{height:auto;min-height:100%;align-content:start;gap:13px}.lesson-stage-head{padding-bottom:12px}.lesson-overview-slide .lesson-stage-head h2{max-height:2.18em;overflow:visible;font-size:clamp(25px,7.5vw,32px);line-height:1.09;text-overflow:clip;white-space:normal}.lesson-stage-head>div>p:last-child{max-height:none;overflow:visible;font-size:12px}.lesson-mission{padding:12px;grid-template-columns:34px minmax(0,1fr);gap:9px}.lesson-mission>strong{grid-column:2;justify-self:start}.mission-copy h3{overflow:visible;line-height:1.2;text-overflow:clip;white-space:normal}.mission-copy p{max-height:none;overflow:visible}.lesson-route{padding:9px;gap:4px}.lesson-route>div:not(.lesson-route-meter){align-items:flex-start;flex-direction:column}.lesson-route i{width:24px;height:24px}.learning-content-card{min-height:0;border-radius:16px}.learning-card-section{padding:14px}.learning-formula{padding-block:17px}.learning-formula .katex{font-size:clamp(20px,7vw,26px)}.learning-options label{min-height:58px;font-size:13px}.checkpoint-head>strong{min-width:68px;font-size:22px}.checkpoint-map{gap:6px}.checkpoint-map i{width:27px;height:27px}.checkpoint-start{padding:16px}.learning-activity-feedback-card{padding:17px}.learning-problem>summary{padding:16px}.problem-condition{padding:17px}.problem-attempt{padding:16px}.problem-options label{min-height:58px}.learning-notes-filters{margin-bottom:13px}.solution-sheet{padding:14px}.solution-sheet-body{grid-template-columns:minmax(0,1fr);gap:15px}.solution-given{padding:0 0 14px;border-right:0;border-bottom:1px solid var(--line)}.solution-steps{gap:13px}.solution-steps>li{padding-left:28px}.solution-sheet .katex{font-size:14px}.solution-trainer{padding:14px}.solution-trainer-modes{width:100%;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.solution-trainer-modes button{justify-content:center;padding:0 8px}.solution-gap-list>li{padding-left:28px}.solution-gap-option{width:100%}.solution-order-list>li{grid-template-columns:22px minmax(0,1fr);grid-template-areas:"index formula" "controls controls";gap:8px 9px}.solution-order-index{grid-area:index;width:22px;height:22px}.solution-order-formula{grid-area:formula}.solution-order-controls{grid-area:controls;justify-content:flex-end}.solution-answer-field{grid-template-columns:minmax(0,1fr);gap:7px}.solution-answer-unit{justify-self:start}.trainer-hero{padding:20px 17px 18px}.trainer-picker{padding:14px}.trainer-filters{gap:8px}.trainer-filter-select{width:100%}.trainer-filter-select select{min-width:0;max-width:none;flex:1 1 auto}.trainer-random{width:100%;margin-left:0}.trainer-problem-list{max-height:268px;grid-template-columns:minmax(0,1fr)}.trainer-card{padding:15px}.trainer-card-head h2{font-size:17px}.trainer-problem-condition{margin-top:13px;padding:14px}.trainer-problem-condition>div{font-size:13px}.lesson-done-panel{padding:22px 18px 18px}.lesson-done-panel h2{font-size:23px}.achievement-filters button,.learning-notes-filters button{min-height:44px}button.learning-reference-trigger{min-height:48px;margin-top:11px;grid-template-columns:28px minmax(0,1fr) auto;gap:8px}.learning-reference-trigger>span:first-child{width:28px;height:28px;border-radius:8px;font-size:17px}.learning-reference-flag{right:12px;top:12px}.account-intro h1{font-size:clamp(38px,11vw,50px)}.topbar nav a{font-weight:700}.topbar nav .active{box-shadow:none;position:relative}.topbar nav .active:after{content:"";width:4px;height:4px;position:absolute;bottom:7px;left:50%;border-radius:50%;background:var(--blue);transform:translateX(-50%)}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:after,:before{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}@media (min-width:600px) and (max-width:900px){.seo-definition-list,.seo-grade-grid,.seo-link-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.seo-problem-options{grid-template-columns:minmax(0,1fr)}.seo-adjacent-links{grid-template-columns:repeat(auto-fit,minmax(232px,1fr))}.constants-compact-list,.contacts-grid,.hero-actions,.quick-paths,.section-modes-grid,.trainer-problem-list{grid-template-columns:repeat(2,minmax(0,1fr))}.solution-trainer-modes{grid-template-columns:repeat(4,minmax(0,1fr))}.diagnostic-options{grid-template-columns:repeat(2,minmax(0,1fr))}.learning-shell,.seo-shell{padding-inline:clamp(24px,4vw,44px)}}@media (min-width:600px) and (max-width:720px){body{padding-bottom:0}.topbar{height:68px;grid-template-columns:minmax(0,1fr) auto auto;gap:16px}.topbar nav{height:auto;padding:0;display:flex;flex-wrap:nowrap;gap:8px;position:static;z-index:auto;border-top:0;background:none;box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none}.topbar nav a{min-height:44px;padding:0 1px;display:inline-flex;align-items:center;font-size:13px;font-weight:600;letter-spacing:-.15px;white-space:nowrap}.topbar nav .active{box-shadow:inset 0 -2px var(--blue)}.topbar nav .active:after{content:none}.locale-switcher{left:max(10px,env(safe-area-inset-left));right:auto;top:auto;bottom:16px;transform:none}.learning-notes-trigger{left:calc(max(10px, env(safe-area-inset-left)) + 132px);bottom:16px}.formula-list-access{right:max(14px,env(safe-area-inset-right));bottom:16px}.constants-page,.contacts-page,.learning-course-mode,.portal-choice-page,.reference-page{height:auto;min-height:100dvh;overflow:visible}html.portal-choice-active,html.portal-choice-active body{height:auto;overflow:auto}}@media (max-width:720px){.learning-card-section p,.lesson-stage-head>div>p:last-child,.seo-detail-hero p:not(.eyebrow),.seo-hero>p:not(.eyebrow),.seo-learning-card p,.seo-problem-card p,.seo-section-note{font-size:16px;line-height:1.5}.seo-entity-link strong,.seo-learning-card h3,.seo-problem-card h3{font-size:14px;line-height:1.4}.seo-breadcrumbs,.seo-problem-card>header>small,.seo-problem-card>header>span,.seo-problem-options-title,.seo-summary b,.seo-summary span{font-size:12px;line-height:1.35}.topbar nav a{min-height:52px}.account-login-method-list button small,.account-social-auth>small,.topbar nav a{font-size:12px}}