:root{color-scheme:light;--bg:#f5f3ed;--panel:#fffefa;--ink:#183c38;--muted:#536965;--line:#ccd5ce;--accent:#116e5e;--accent-soft:#e4eee7;--orange:#9f401d;--warm:#f6e7d5;--shadow:0 16px 45px #193c3810;--radius:18px;--serif:Georgia,'Times New Roman',serif;--sans:system-ui,-apple-system,'Segoe UI',sans-serif}
html[data-theme=dark]{color-scheme:dark;--bg:#101f1d;--panel:#172925;--ink:#f3f0e6;--muted:#b2c3ba;--line:#3b5149;--accent:#86dcc2;--accent-soft:#243d34;--orange:#ffb286;--warm:#3b3024;--shadow:0 16px 45px #0002}
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@media(min-width:1500px){.hero{padding-block:88px 70px}}
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@media(max-width:480px){.shell{width:calc(100% - 32px)}.header-row{column-gap:6px}.brand{gap:8px}.brand small{display:none}.brand strong{max-width:140px}.header-tools{gap:5px}.icon-button{width:31px;height:31px}.language a,.language span{padding:7px 8px}.menu-toggle{order:4;margin-left:auto;margin-top:4px}.hero h1{font-size:2.85rem}.hero-art svg{height:215px}.grid3{grid-template-columns:1fr}.card-visual{height:170px}.card-visual svg{height:140px}.button-row{gap:9px}.button{padding:11px 17px;font-size:.8rem}.spotlight{padding:22px}.course-number{margin-bottom:22px}.card p{font-size:.88rem}.section-head h2{font-size:2.2rem}.catalog-toolbar{grid-template-columns:1fr}.catalog-toolbar .field:first-child{grid-column:auto}.notes-panel{padding:24px}.metric strong{font-size:1.5rem}.metric{padding:12px 9px}.panel{padding:18px}.controls .button{flex:1}.lab-svg text{font-size:12px}.footer-links{flex-wrap:wrap}.back-top{bottom:16px;right:14px}}
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@media print{body{background:#fff;color:#111}.site-header,.site-footer,.back-top,.reading-tools,.toc,.reading-progress,.toast,.controls,.save{display:none!important}.shell{width:100%}.article-layout{display:block}.prose{max-width:none;color:#111}.article-header{padding-top:0}a{color:#111}.prose img{max-height:400px}.prose pre,.prose blockquote{break-inside:avoid}.panel{border-color:#888}.lab-layout{display:block}.prose h2,.prose h3{break-after:avoid}}
.hero-art .net-edge{fill:none}

/* Learning, reading and search controls. */
.header-row{gap:18px;min-height:84px}nav{gap:16px}.hero{padding-block:40px 42px;gap:46px}.hero h1{font-size:clamp(2.7rem,4.95vw,4.35rem);margin-bottom:22px}.hero .lead{line-height:1.7}.hero-art{min-height:340px;padding:26px}.hero-note{margin-top:18px}.hero .button-row{margin-top:22px}
.art-links{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 16px}.art-links a{border:1px solid #ffffff40;padding:5px 9px;border-radius:100px;font-size:.67rem;text-decoration:none;min-height:28px}.art-links a:hover{background:#ffffff18}.hero-art .node-hit{fill:transparent}.hero-art svg a:hover circle:not(.node-hit),.hero-art svg a:focus circle:not(.node-hit){stroke:#f1b580;stroke-width:4}.hero-art svg a:focus-visible{outline:3px solid #f1b580;outline-offset:3px}.route-requirement{font-size:.75rem!important;border-top:1px solid var(--line);padding-top:14px}.route-steps{list-style:none;padding:0;margin:4px 0 12px;counter-reset:route}.route-steps li{display:flex;align-items:center;gap:10px;min-height:48px;border-bottom:1px solid var(--line);font-size:.81rem;line-height:1.5}.route-steps input{width:24px;height:24px;accent-color:var(--accent);flex-shrink:0;margin:0 2px}.route-steps a{padding-block:10px}.route-status{color:var(--accent)!important;font-weight:650;margin-top:auto;padding-top:14px}.route-card .button{align-self:start}.local-note{font-size:.75rem!important;color:var(--muted);margin-top:16px}.study-tools{background:var(--accent-soft);border:1px solid var(--line);border-radius:14px;padding:22px;margin:40px 0 24px}.study-tools h2{margin-top:0!important;font-size:1.4rem}.study-tools .reading-tools{margin:14px 0 20px}.field textarea{font:inherit;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--ink);padding:12px;width:100%;resize:vertical;min-height:112px}textarea:focus-visible{outline:3px solid var(--orange);outline-offset:4px}.study-tools .local-note{margin-bottom:0}.search-excerpt{background:var(--accent-soft);border-left:2px solid var(--accent);padding:10px 12px;font-size:.78rem!important}.notes-list p{font-size:.79rem!important;margin:6px 0 0}.notes-list li{padding-block:12px}.stage-indicator{background:var(--accent-soft);padding:7px 12px;border-radius:8px;color:var(--accent);font-size:.77rem;font-weight:650}.challenge-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:24px}.challenge{min-width:0;border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:18px}.challenge legend{font-size:.88rem;line-height:1.5;font-weight:650;padding:0 8px}.challenge label{display:flex;align-items:start;gap:9px;font-size:.84rem;line-height:1.55;padding:10px 0;min-height:44px;cursor:pointer}.challenge input{margin-top:4px;accent-color:var(--accent);flex-shrink:0;width:18px;height:18px}.challenge .button{margin-top:12px;font-size:.76rem}.challenge-feedback{font-size:.81rem!important;line-height:1.7;min-height:1.5em;margin:16px 0 0!important}.challenge[data-result=correct]{border-color:var(--accent)}.challenge[data-result=review]{border-color:var(--orange)}.katex-display{overflow-x:auto;overflow-y:hidden;padding:8px 2px;max-width:100%}.prose .katex{font-size:1.1em}.math-error{color:var(--orange)}.toc{max-height:calc(100vh - 60px);overflow-y:auto}.prose h2,.prose h3{scroll-margin-top:36px}
@media(min-width:1500px){.hero{padding-block:52px}}
@media(max-width:1100px){.hero{gap:30px}.hero-art{min-height:320px}.header-row{gap:14px}nav{gap:20px}.challenge-grid{grid-template-columns:1fr}.challenge label{padding:12px 0}.hero h1{font-size:clamp(2.6rem,5.1vw,4rem)}}
@media(max-width:760px){.hero{padding-block:30px;gap:26px}.hero h1{font-size:clamp(2.6rem,7.8vw,3.5rem)}.hero-art{min-height:0}.header-row{min-height:76px}.toc{max-height:none}.route-steps{margin-top:12px}.study-tools{padding:18px}.art-links{margin-top:14px}}
@media(max-width:480px){.hero h1{font-size:2.55rem}.hero .lead{font-size:.92rem}.hero-art{padding:22px}.hero .button-row{gap:8px}.hero .button{font-size:.76rem;padding:11px 15px}.study-tools .reading-tools .button{font-size:.75rem;padding:9px 14px}.header-tools{margin-left:auto}.art-links a{font-size:.65rem}}
@media print{.study-tools,.challenge button,.route-steps input,.art-links{display:none!important}.toc{max-height:none}.katex-display{overflow:visible}.hero-art svg a{pointer-events:none}}