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@media(min-width:1550px){main{padding:46px 60px}.hero{min-height:320px}.hero-content{padding:40px}.card-art{height:120px}.dashboard-grid{grid-template-columns:minmax(0,1fr) 310px}}
@media(max-width:1200px){:root{--sidebar:235px}.topbar{padding:0 27px}main{padding:30px 27px}.dashboard-grid{grid-template-columns:minmax(0,1fr) 245px;gap:20px}.stat{padding:14px 13px;gap:10px}.stat-icon{width:30px;height:33px}.hero-content{padding:29px}.hero h1{font-size:37px}.lesson-layout{grid-template-columns:minmax(0,1fr)}.lesson-toc{position:static;grid-row:1;border:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}.lesson-toc .eyebrow{display:none}.lesson-toc a{font-size:10px;border:1px solid var(--line);padding:6px 10px;border-radius:20px}.top-controls{gap:10px}.search-trigger kbd{margin-left:10px}.hero-meta{gap:9px}.dashboard-grid .aside-card{padding:18px}.card-body{padding:17px}}
@media(max-width:1050px){.dashboard-grid{grid-template-columns:1fr}.dashboard-aside{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.dashboard-aside .aside-card{margin:0}.tip-card{display:none}.hero{grid-template-columns:1.3fr 1fr}.hero h1{font-size:34px}.stats-grid{gap:10px}.stat{padding:13px 10px}.stat-icon{display:none}.top-left{gap:10px}#breadcrumb{max-width:180px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.search-trigger span,.search-trigger kbd{display:none}.search-trigger{font-size:20px;border:0;background:none;padding:0;width:30px}.hero-meta{flex-wrap:wrap}.stats-grid strong{font-size:20px}.hero p{font-size:12px}}
@media(max-width:780px){:root{--sidebar:268px}#sidebar{transform:translateX(-100%)}#workspace{margin-left:0}.mobile-open #sidebar{transform:translateX(0)}.mobile-open .scrim{display:block;position:fixed;inset:0;background:#15132166;z-index:39}.topbar{padding:0 18px;height:67px}#reading-line{top:66px;left:0}main{padding:25px 20px 40px}.hero{min-height:260px}.hero-content{padding:27px}.hero-art{padding-right:8px}.hero h1{font-size:36px}.welcome-line{margin-bottom:18px}.date-label{display:none}.lesson-section{padding:23px}.page-header h1{font-size:34px}.avatar{display:none}.stats-grid{margin-bottom:26px}.source-reader{margin:0 -5px}footer{margin:0 20px;font-size:10px;flex-wrap:wrap}.mode-control select{font-size:10px}.top-controls{gap:8px}.source-line{font-size:9px}.top-left{font-size:11px}.lesson-toc{gap:5px}.lesson-toc a{font-size:9px}.hero-meta{font-size:9px}.hero .eyebrow{font-size:9px}.control-grid.four{grid-template-columns:repeat(2,1fr)}}
@media(max-width:540px){body{font-size:14px}.hero{grid-template-columns:1fr;min-height:auto}.hero-content{padding:28px}.hero-art{height:170px;padding:0 30px 12px;margin-top:-8px}.hero-art svg{height:100%;max-width:300px}.hero h1{font-size:39px;max-width:330px}.hero p{max-width:320px}.hero-meta{gap:13px}.stats-grid{grid-template-columns:repeat(2,1fr);gap:10px}.stat{padding:14px 16px}.stat-icon{display:grid;width:30px;height:30px;font-size:14px}.stat strong{font-size:21px}.module-grid{grid-template-columns:1fr}.card-art{height:115px}.card-body{padding:22px}.card-body h3{font-size:18px}.card-body p{font-size:12px}.dashboard-aside{grid-template-columns:1fr}.dashboard-aside .aside-card:first-child{display:none}.page-header h1{font-size:31px;letter-spacing:-1px}.lesson-section{padding:22px 18px}.lesson-section h2{font-size:22px}.lesson-section p,.lesson-section li{font-size:13px}.lab-content{padding:16px}.lab-head{padding:14px 16px}.lab-head .pill{display:none}.control-grid{grid-template-columns:1fr}.compare-grid,.revision-grid,.quiz-options{grid-template-columns:1fr}.quiz-card{padding:19px}.quiz-score{padding:17px}.flashcard{padding:25px 20px;min-height:260px}.flashcard strong{font-size:23px}.flash-controls{flex-wrap:wrap}.formula .katex{font-size:1.02em}.topbar{padding:0 12px}.top-controls{gap:4px}.top-left{gap:4px}#breadcrumb{max-width:140px}.objective-box{padding:20px}.section-heading h2{font-size:20px}.section-heading{gap:10px}.section-link{font-size:10px}.reader-toolbar{gap:7px}.reader-toolbar .btn{padding:6px 9px}.source-card{padding:19px}.source-card h3{font-size:15px}.welcome-line .eyebrow{font-size:9px}.bitrow{grid-template-columns:75px 1fr}.bits{gap:3px}.bits span{padding:4px}.flash-controls .btn{font-size:10px;padding:8px 12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.btn:hover,.module-card:hover{transform:none}}
@media print{#sidebar,.topbar,.lesson-toc,footer,.btn-row,.lab,.code-toolbar button,#reading-line{display:none!important}#workspace{margin:0}main{padding:0}.lesson-section{break-inside:avoid;border:0}.page-header h1{font-size:28px}body{background:white;color:black}}
.topic-anchor{display:block;scroll-margin-top:110px}.derivation-current{background:var(--violet-light)}.derive-output{animation:reveal .2s ease-out}@keyframes reveal{from{opacity:.4;transform:translateY(3px)}to{opacity:1;transform:translateY(0)}}
.top-left{min-width:0;flex:1}#breadcrumb{min-width:0}.top-controls{flex-shrink:0}

.module-card:nth-child(6) .card-art{background:#f5e6e8}
.figure-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:15px;margin:18px 0}
.figure-card{margin:0;background:var(--surface2);border:1px solid var(--line);border-radius:10px;overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow)}
.figure-card img{width:100%;height:auto;display:block;border-bottom:1px solid var(--line);background:#fff}
.figure-card figcaption{padding:12px 14px;font-size:12px;line-height:1.6;color:var(--muted)}
.figure-card figcaption strong{display:block;color:var(--ink);margin-bottom:4px;font-size:12.5px}
.visual-diagram{background:var(--surface2);border:1px solid var(--line);border-radius:10px;padding:18px;margin:18px 0;text-align:center}
.visual-diagram svg{max-width:100%;height:auto;display:block;margin:0 auto}
.visual-caption{font-size:11.5px;color:var(--muted);margin-top:10px;line-height:1.55}
.step-flow{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px;margin:16px 0}
.step-box{background:var(--surface2);border:1px solid var(--line);border-radius:9px;padding:14px 15px}
.step-box b{display:block;font-size:12.5px;color:var(--accent);margin-bottom:5px}
.step-box p{font-size:12px!important;line-height:1.55!important;margin:0;color:var(--ink)}