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@media(min-width:1500px){.book-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.hero-art{height:340px}.hero{gap:70px}}
@media(max-width:1100px){.sidebar{width:215px;padding:28px 15px}.workspace{margin-left:215px}.hero h1{font-size:43px}.book-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.reader-layout{grid-template-columns:1fr}.toc{position:static;max-height:180px}.reading{padding:25px}.lab-grid{grid-template-columns:1fr}.lab-controls{display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.lab-controls p{grid-column:1/-1}}
@media(max-width:760px){.sidebar{inset:auto 0 0;width:auto;padding:0;background:#fffef9ed;border:0;border-top:1px solid var(--line);height:66px;backdrop-filter:blur(12px)}.brand,.nav-label,.side-bottom{display:none}.sidebar nav{display:flex;justify-content:space-around;gap:0;height:100%}.sidebar nav a{display:flex;flex-direction:column;gap:4px;justify-content:center;padding:6px 3px;font-size:9px;border-radius:0;flex:1;line-height:1.2}.sidebar nav a span{font-size:22px}.sidebar nav em{display:none}.workspace{margin-left:0;padding-bottom:65px}.topbar{height:83px;padding:15px 6%}.crumb{font-size:8px;letter-spacing:1.5px}.institute{gap:7px}.institute img{width:45px;height:45px}.institute span{font-size:8px}.institute strong{font-size:9px}main{padding:27px 6% 30px}.hero{grid-template-columns:1fr;gap:22px}.hero h1{font-size:43px;max-width:400px}.hero p{font-size:13px;max-width:100%}.hero-art{height:230px;border-radius:110px 110px 9px 9px}.hero-buttons{margin-top:19px}.stats{margin:24px 0;padding:16px 0}.stat{padding-left:12px}.stat b{font-size:25px}.stat small{font-size:9px}.section-head{margin:27px 0 17px}.section-head h2{font-size:22px}.text-link{font-size:11px}.book-grid{gap:12px}.book-cover{height:142px;padding:15px}.book-cover svg{width:150px;height:150px;right:-30px}.book-cover .cover-mark{left:15px;font-size:10px}.book-cover .cover-topic{left:15px;font-size:27px;top:50px}.book-num{font-size:11px}.book-info{padding:15px}.book-info h3{font-size:14px;min-height:60px;line-height:1.45;margin-bottom:8px}.book-meta{font-size:9px;gap:4px}.book-action{font-size:11px;margin-top:12px}.feature-row{grid-template-columns:1fr;gap:12px}.feature{padding:20px}.page-title h1{font-size:32px}.page-title{flex-wrap:wrap;gap:12px}.page-title p{font-size:12px}.panel{padding:20px}.toolbar{gap:8px}.toolbar input,.toolbar select{width:100%;max-width:none;flex:auto}.reading{padding:21px 18px}.reading h1{font-size:29px}.prose{font-size:calc(var(--reader) - 1px);line-height:1.8}.toc{max-height:155px}.reader-controls{gap:6px}.reader-controls .spacer{display:none}.reader-bottom .btn{font-size:11px;padding:8px}.problem-item{padding:17px}.problem-item .prose{font-size:16px}.lab-canvas{height:320px}.lab-controls{grid-template-columns:1fr}.lab-controls p{grid-column:auto}.result-grid{gap:8px}.result-grid .panel{padding:15px}.result-grid b{font-size:26px}.result-grid small{font-size:10px}.test-header{font-size:12px}footer{font-size:9px;padding:10px 6% 20px}#toast{bottom:85px}.test-config{padding:20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

.btn{border:1px solid var(--line);border-radius:9px}input[type=checkbox]{width:16px;min-width:16px;height:16px;flex:none;padding:0;accent-color:var(--teal)}
/* Extended dynamics laboratory */
.lab-tabs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;margin-bottom:24px}
.lab-tab{justify-content:flex-start;align-items:flex-start;text-align:left;padding:12px 13px;font-size:12px;line-height:1.35;min-height:67px;white-space:normal}
.lab-tab-n{font:12px Georgia;opacity:.65;margin:2px 5px 0 0}
.lab-tab small{display:block;font-size:9px;margin-top:5px;font-weight:400;line-height:1.3}
.lab-tab.primary small{color:#d2ded4}.lab-title-row{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:22px}.lab-title-row h2{margin:0}
.lab-controls input[type=text],.lab-controls input[type=number],.lab-controls select{max-width:100%;width:100%}.lab-controls .toolbar{margin:12px 0;gap:6px}.lab-controls .btn{font-size:11px;padding:7px 10px}
.lab-details:not(:empty){border-top:1px solid var(--line);padding-top:23px;margin-top:24px;font-size:13px;line-height:1.8}
.lab-details h3{font-size:16px;margin:20px 0 10px}.lab-details .prose{font-size:17px}.lab-details p{margin-bottom:12px}
.lab-metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:16px 0}.lab-metric{border:1px solid var(--line);padding:15px;border-radius:9px;background:#f4f6ed;min-width:0}.lab-metric strong{display:block;font:24px Georgia;line-height:1.3;overflow-wrap:anywhere}.lab-metric small{display:block;font-size:10px;line-height:1.5;margin-top:7px}.lab-metric b{display:block;font-size:21px;line-height:1.4}.lab-note,.lab-status{font-size:12px;color:var(--muted);padding:10px 13px;background:#f4f5ec;border-radius:7px;margin:12px 0}.lab-task{font-size:13px;padding:15px 17px;background:#f3ecda;border-left:3px solid #b78d44;border-radius:0 8px 8px 0;margin:16px 0}.lab-task strong{color:#86652e}.lab-formula{padding:13px 17px;border:1px solid var(--line);border-radius:8px;background:#fafbf5;overflow-x:auto}.lab-legend{display:flex;gap:15px;flex-wrap:wrap;font-size:11px;color:var(--muted);margin:12px 0}.lab-legend i{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:5px}.lab-canvas{touch-action:pan-y}.lab-details .katex-display{overflow-x:auto;overflow-y:hidden;max-width:100%}.lab-details .katex{position:relative}.lab-controls .katex{position:relative}.lab-controls .katex-display{overflow-x:auto;overflow-y:hidden;max-width:100%}
@media(max-width:1200px){.lab-tabs{grid-template-columns:repeat(2,minmax(0,1fr))}.lab-tab{min-height:58px}.lab-title-row{flex-wrap:wrap}}
@media(max-width:760px){.lab-tabs{gap:7px}.lab-tab{padding:10px 9px;font-size:10px;min-height:61px}.lab-tab-n{font-size:10px;margin-right:3px}.lab-tab small{font-size:8px}.lab-metrics{grid-template-columns:1fr 1fr;gap:8px}.lab-metric{padding:12px}.lab-metric strong{font-size:21px}.lab-details{font-size:12px}.lab-title-row .pill{font-size:9px}.lab-details .prose{font-size:16px}}
/* Simulation families and compact phone navigation */
.lab-category-bar{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px}.lab-category-count{font-size:9px;opacity:.75;min-width:15px;text-align:center}.lab-mobile-picker{display:none;font-size:11px;color:var(--muted);margin:0 0 18px}.lab-mobile-picker select{display:block;width:100%;margin-top:6px;color:var(--ink)}.lab-canvas{cursor:default}.lab-controls input[type=range]{min-height:22px}.lab-controls button{white-space:normal}.lab-details code{font-size:12px;overflow-wrap:anywhere}.lab-status:empty{display:none}.lab-controls .lab-metric strong{font-size:23px}.lab-controls .lab-metrics{grid-template-columns:1fr}
@media(max-width:760px){.lab-mobile-picker{display:block}.lab-tabs{display:none}.lab-category-bar{gap:6px}.lab-category-bar .btn{font-size:10px;padding:7px 9px}.lab-controls{display:block}.lab-controls .toolbar{display:flex}.lab-controls .lab-metrics{grid-template-columns:1fr 1fr}.lab-title-row h2{font-size:22px}}

/* Function inputs and integrated animation lessons */
.custom-param-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.custom-param-grid>div{min-width:0}.lab-controls input[type=text]{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.lab-controls input[type=text]:focus{outline:2px solid var(--accent);outline-offset:2px}.lab-details video{display:block;width:100%;max-height:500px;aspect-ratio:16/9;background:#142e31;border-radius:10px}.lab-details summary{cursor:pointer;font-weight:600;padding:10px 0}.lab-caption:empty{display:none}.lab-tabs{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
@media(max-width:760px){.lab-tabs{display:none}.custom-param-grid{gap:8px}.lab-details video{max-height:300px}}

/* Standalone question conditions, visible before every attempt. */
.question-context{border:1px solid #d7dfcf;border-left:3px solid #b58a3d;border-radius:8px;padding:16px 19px;margin:18px 0;background:#f1f4e9}.question-context .eyebrow{font-size:9px;letter-spacing:1.6px;color:#607368;margin:0 0 9px}.question-context .prose{font-size:16px;line-height:1.8}.question-context .prose p:last-child{margin-bottom:0}.question-statement{overflow-wrap:break-word}.problem-item .question-context{padding:12px 15px;margin:12px 0}.problem-item .question-context .prose{font-size:14px}.question-context .katex-display{overflow-x:auto;overflow-y:hidden}.question-context p{margin-top:0}
@media(max-width:760px){.question-context{padding:13px 14px}.question-context .prose{font-size:15px}.problem-item .question-context .prose{font-size:14px}}
.question-context .prose,.question-statement{min-width:0;max-width:100%;overflow-x:auto}.question-context .katex-display,.question-statement .katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden}