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0;font-size:13px;color:var(--primary)}.viz-head{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin-bottom:15px}.viz-title{font-size:15px;color:var(--primary)}.viz-hint{font-size:11px;color:var(--muted)}.viz-body{display:flex;gap:22px;flex-wrap:wrap}.viz-ctrls{flex:1 1 220px;min-width:0}.viz-plot{flex:1.2 1 300px;min-width:0}.viz-plot svg{width:100%;height:auto;display:block;background:var(--card);border:1px solid var(--border);border-radius:var(--r-sm)}.viz-g{stroke:var(--border);stroke-width:1}.viz-ax{stroke:var(--muted);stroke-width:1.5}.viz-axf{fill:var(--muted)}.viz-t{fill:var(--muted);font-size:9.5px}.viz-ref{fill:none;stroke:var(--muted);stroke-width:1.5;stroke-dasharray:5 4;opacity:.5}.viz-curve{fill:none;stroke:var(--primary);stroke-width:2.5;stroke-linecap:round}.viz-sym{stroke:#f59e0b;stroke-width:1.5;stroke-dasharray:4 4;opacity:.65}.viz-vertex{fill:#f59e0b;stroke:var(--card);stroke-width:2}.viz-yint{fill:#10b981;stroke:var(--card);stroke-width:1.5}.viz-sl{display:flex;align-items:center;gap:8px;margin:14px 0}.viz-sl .p{flex:none;width:84px;font-size:12px;color:var(--muted);font-weight:600}.viz-sl input[type=range]{flex:1;accent-color:var(--primary);min-width:0;height:30px;margin:0}.viz-sl b{flex:none;width:40px;text-align:right;font-size:12px;color:var(--text)}.viz-presets{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}.viz-pre{border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:6px;font-size:11px;padding:7px 10px;min-height:36px;cursor:pointer}.viz-pre:hover{border-color:var(--primary);color:var(--primary)}.viz-tip{font-size:12px;color:var(--muted);line-height:1.9;margin:15px 0}.viz-legend{display:flex;gap:12px;flex-wrap:wrap;font-size:11px;color:var(--muted);margin-top:6px}.viz-legend 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@media(min-width:1550px){main{padding-top:45px}.hero{min-height:235px}.hero h2{font-size:30px}.two-column{grid-template-columns:minmax(0,1fr) 335px}}
@media(max-width:1200px){.sidebar{width:210px;padding-left:17px;padding-right:17px}.workspace{margin-left:210px}main{padding:28px}.topbar{padding:0 28px}.two-column{grid-template-columns:minmax(0,1fr) 260px}.stat{padding:16px}.units-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-layout{grid-template-columns:minmax(0,1fr) 210px}.practice-grid{grid-template-columns:minmax(0,1fr) 210px}.panel{padding:20px}.settings-layout{grid-template-columns:minmax(0,1fr) 240px}}
@media(max-width:1000px){.two-column{grid-template-columns:1fr}.dashboard-side{display:grid;grid-template-columns:1fr 1fr;gap:20px}.dashboard-side .panel+.panel{margin-top:0}.lesson-layout,.practice-grid{grid-template-columns:1fr}.lesson-side{display:none}.practice-side{order:-1}.practice-side .question-index{max-height:85px}.practice-side .panel{padding:16px}.practice-side .help-text{display:none}.settings-layout{grid-template-columns:1fr}.stat-grid{gap:12px}.top-actions .edition{display:none}.hero-art{width:48%}footer{padding:20px 28px}}
@media(max-width:760px){.sidebar{transform:translateX(-100%);transition:transform .2s;width:238px;box-shadow:15px 0 60px #163d3920}.sidebar.open{transform:translateX(0)}.workspace{margin-left:0}.mobile-menu{display:grid;margin-left:-6px}.topbar{height:66px;padding:0 18px}.breadcrumb{gap:9px}.top-actions{gap:8px}main{padding:25px 18px;min-height:calc(100vh - 130px)}h1{font-size:25px}.intro{margin-bottom:22px}.date-badge{display:none}.hero{padding:24px;min-height:215px}.hero-copy{max-width:82%}.hero h2{font-size:24px}.hero-art{right:-75px;width:57%;opacity:.5}.hero p{max-width:250px}.stat-grid{grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:22px}.stat{padding:16px}.stat strong{font-size:27px}.dashboard-side{display:block}.dashboard-side .panel+.panel{margin-top:20px}.two-column{gap:20px}.units-grid{gap:13px}.unit-card{padding:17px;min-height:237px}.unit-card h3{font-size:16px}.unit-top{margin-bottom:13px}.unit-meta{gap:6px;flex-wrap:wrap}.filters{gap:8px}.filters select{max-width:47%;font-size:12px}.filters input{width:100%;flex-basis:100%}.lesson-header{padding:23px}.lesson-tabs{padding:0 20px;gap:20px}.lesson-body{padding:20px}.lesson-body h2{font-size:16px}.learn-items li{font-size:14px;padding-left:34px}.guest-banner{padding:12px;font-size:11px;gap:10px}.guest-banner .button{font-size:11px;padding:6px 9px;min-height:36px}.question-card,.mistake-card{padding:20px}.practice-grid{gap:16px}.question-nav .button{padding:8px 11px}.form-grid input,.form-grid select,textarea{font-size:16px}.settings-layout{gap:20px}#toast{left:50%}.course-row{gap:11px}.course-info p{font-size:10px}.section-head .text-link{font-size:10px}.course-row .button{padding:6px 9px}.course-symbol{width:40px;height:40px}.intro .button{font-size:12px;padding:9px 12px}.viz-plot{flex-basis:100%}footer{padding:20px 18px;gap:9px}footer>span:last-child{margin-left:0;width:100%}.lesson-footer .button{font-size:12px}.brand{font-size:20px}}
@media(max-width:420px){.units-grid{grid-template-columns:1fr}.unit-card{min-height:210px}.hero-copy{max-width:95%}.hero-art{opacity:.3}.hero h2{font-size:22px}.intro h1{font-size:23px}.panel{padding:18px}.breadcrumb>span:first-of-type{display:none}.breadcrumb .slash{display:none}.lab-info{grid-template-columns:1fr 1fr}.question-nav{gap:8px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
svg{width:1em;height:1em;flex-shrink:0}.text-link svg{width:15px;height:15px}.hero-art{width:42%;height:100%}.lab-promo .mini-plot{width:85px;height:74px}.course-row>span svg{width:14px;height:14px;vertical-align:middle}.section-head .text-link{flex-shrink:0}.coin-stats+.viz-plot{max-width:650px}
@media(max-width:1000px){.hero-art{width:48%}}@media(max-width:760px){.hero-art{width:57%}}