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/* Sil Lim Tao — lesson page */
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@media(max-width:1000px){.position-card{grid-template-columns:.5fr 1.5fr}.position-facts{grid-column:2}}
@media(max-width:800px){.positions-hero{min-height:650px;padding:140px 6vw 70px;grid-template-columns:1fr}.hero-hand{display:none}.atlas-intro-grid{grid-template-columns:1fr;gap:30px}.atlas-key{grid-template-columns:1fr}.position-card{grid-template-columns:1fr;padding:55px 6vw;gap:30px}.position-card>header>p{margin-top:18px}.position-views,.position-facts{grid-column:1}.position-facts{grid-template-columns:1fr}.position-views figure{padding:6px}}
.positions-hero.text-only{grid-template-columns:1fr}.positions-hero.text-only>div{max-width:900px}.atlas-lead{color:#625e56;line-height:1.8;max-width:570px}.position-card.text-card{grid-template-columns:.5fr 1.5fr}.position-card.text-card .position-facts{grid-template-columns:repeat(2,1fr);gap:35px 5vw}.text-form-movement{grid-template-columns:.22fr 1fr}.form-movement-number{font-family:var(--display);font-size:clamp(3rem,6vw,6rem);color:var(--red);align-self:start}.text-form-movement>div:last-child{max-width:900px}
@media(max-width:800px){.position-card.text-card,.text-form-movement{grid-template-columns:1fr}.position-card.text-card .position-facts{grid-template-columns:1fr}.form-movement-number{font-size:3rem}}
.concepts-hero{min-height:700px;background:#171714;color:#eee9df;padding:165px 8vw 90px;display:grid;grid-template-columns:1fr .8fr;align-items:center;overflow:hidden}.concepts-hero h1{font-family:var(--display);font-weight:400;font-size:clamp(4.5rem,9vw,8.5rem);line-height:.82;letter-spacing:-.05em;margin:.3em 0}.concepts-hero h1 em{color:var(--red);font-weight:400}.concepts-hero>div:first-child>p:last-child{max-width:520px;color:#999;line-height:1.7}.concepts-hero-mark{height:420px;position:relative}.concepts-hero-mark span{position:absolute;left:50%;top:8%;width:2px;height:84%;background:repeating-linear-gradient(to bottom,var(--red) 0 8px,transparent 8px 16px)}.concepts-hero-mark i{position:absolute;left:12%;right:12%;bottom:12%;height:2px;background:#555}.concepts-hero-mark b{position:absolute;left:18%;right:18%;top:16%;bottom:12%;clip-path:polygon(50% 0,100% 100%,0 100%);background:rgba(181,59,47,.12);border-bottom:2px solid #777}.concepts-intro{display:grid;grid-template-columns:1fr 1fr;gap:5vw}.concepts-intro .section-number{grid-column:1/-1}.concepts-intro h2{font-size:clamp(3rem,5.3vw,6rem)}.concept-key{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-content:center;font-size:.72rem;text-transform:uppercase;letter-spacing:.08em}.concept-key span{display:flex;align-items:center;gap:12px}.concept-key i{display:block;width:35px;height:3px}.concept-key .red{background:var(--red)}.concept-key .grey{background:#777}.concept-key .dashed{border-top:2px dashed #9d8e78}.concept-key .zone{height:16px;background:rgba(181,59,47,.15);border:1px solid rgba(181,59,47,.5)}.concept-grid{background:#171714;color:#eee9df}.concept-card{display:grid;grid-template-columns:1fr 1fr;gap:7vw;padding:75px 8vw;border-top:1px solid rgba(255,255,255,.16);align-items:center}.concept-visual{background:#201f1c;border:1px solid #33312d;padding:20px}.concept-visual svg{display:block;width:100%;max-height:360px}.concept-visual .structure{fill:none;stroke:#777;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}.concept-visual .thick{stroke-width:10}.concept-visual .axis{stroke:#756c61;stroke-width:1.5;stroke-dasharray:6 6}.concept-visual .action{fill:none;stroke:var(--red);stroke-width:4;stroke-linecap:round}.concept-visual .alternative{fill:none;stroke:#8c8172;stroke-width:2;stroke-dasharray:7 6}.concept-visual .zone-fill{fill:rgba(181,59,47,.1);stroke:none}.concept-visual .node{fill:#201f1c;stroke:#888;stroke-width:3}.concept-visual .active-node{fill:var(--red);stroke:var(--red)}.concept-visual .ground{stroke:#777;stroke-width:5}.concept-visual text{fill:#888;font:600 10px var(--sans);letter-spacing:.1em;text-anchor:middle}.concept-copy>span{font-family:var(--display);font-size:4rem;color:var(--red)}.concept-copy h2{font-family:var(--display);font-weight:400;font-size:clamp(2.5rem,4.3vw,4.8rem);line-height:1;margin:.25em 0}.concept-copy p{color:#aaa;line-height:1.75;max-width:560px}.concept-copy h3{margin:28px 0 5px;color:var(--red);font-size:.62rem;letter-spacing:.16em;text-transform:uppercase}
@media(max-width:800px){.concepts-page{overflow-x:hidden}.concepts-hero{min-height:650px;padding:140px 6vw 70px;grid-template-columns:minmax(0,1fr)}.concepts-hero-mark{display:none}.concepts-intro,.concept-card{grid-template-columns:minmax(0,1fr)}.concept-key{grid-template-columns:1fr}.concept-card{padding:55px 6vw;gap:35px}.concept-visual{padding:8px;min-width:0;overflow:hidden}.concept-visual svg{width:100%;height:auto}.concept-copy{min-width:0}.concept-copy>span{font-size:3rem}}
.source-panel{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center;margin-top:38px;padding:24px;border:1px solid rgba(255,255,255,.18);max-width:920px}.source-panel strong{width:100%;font-size:.62rem;text-transform:uppercase;letter-spacing:.16em;color:var(--red)}.source-panel a{color:#eee9df;text-decoration:none;border-bottom:1px solid #655f57;padding-bottom:4px;font-size:.74rem}.source-panel p{width:100%;margin:5px 0 0;color:#777;font-size:.7rem;line-height:1.5}.evidence{display:inline-block;margin:0 0 12px;padding:7px 10px;border:1px solid #555;color:#aaa;font-size:.56rem;text-transform:uppercase;letter-spacing:.12em}.evidence.direct{border-color:var(--red);color:#e26c5e}.evidence.observed{border-color:#83725d;color:#b8a488}.evidence.inferred{border-style:dashed;color:#777}
.pose-diagram,.form-movement-visual,.position-views,.diagram-legend{display:none!important}