#physiology{width:calc(100% - 48px);max-width:1380px;margin:24px auto 0;padding-bottom:60px}
.animation-library-nav{width:calc(100% - 48px);max-width:1380px;margin:24px auto 0;padding:24px 0 0;color:var(--ink);font-family:var(--body-font,-apple-system,BlinkMacSystemFont,"PingFang HK",sans-serif)}.animation-library-nav[hidden]{display:none!important}.animation-library-nav .ph-topic-tabs{margin-bottom:0}.animation-library-nav button{font:inherit;border-radius:0;touch-action:manipulation}.animation-library-nav button:focus-visible{outline:3px solid var(--focus,#936d24);outline-offset:3px}.animation-library-nav button:hover{box-shadow:inset 0 -2px var(--ink)}
.animation-library-nav~#physiology,.animation-library-nav~#cellDivision{margin-top:0}
.physiology-lab{padding:24px 0 44px;color:var(--ink,#173e33);font-family:var(--body-font,-apple-system,BlinkMacSystemFont,"PingFang HK",sans-serif)}
.ph-heading{background:none;border:0;border-radius:0;padding:0;box-shadow:none}.ph-kicker{font:11px/1.5 ui-monospace,monospace;letter-spacing:.1em;color:var(--muted)}.ph-heading h1{font-size:30px;margin:5px 0 10px}.ph-heading p{max-width:900px;font-size:15px;line-height:1.8}
.ph-topic-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:22px 0 18px}.physiology-lab button,.physiology-lab select{font:inherit;border-radius:0;touch-action:manipulation}
.ph-topic,.ph-control{border:1px solid var(--ink);color:var(--ink);background:var(--surface);padding:10px 13px;min-height:44px;cursor:pointer}.ph-topic{text-align:left;font-weight:650!important}.ph-topic[aria-pressed=true]{background:var(--ink);color:var(--surface)}.ph-topic small{display:block;font-weight:400;font-size:11px;margin-top:4px;opacity:.8}
.ph-description{font-weight:650;line-height:1.8}.ph-model-note,.ph-note{font-size:12px;color:var(--muted);line-height:1.8}.ph-study{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(300px,1fr);gap:28px;border:1px solid var(--line);padding:22px;background:var(--surface)}.ph-figure{margin:0;min-width:0}.ph-viewport{background:var(--sage,#e5ead9);border:1px solid var(--line);overflow:auto;max-width:100%;position:relative}.ph-board{display:block;width:100%;height:auto;aspect-ratio:10/7;image-rendering:auto;shape-rendering:geometricPrecision}.ph-viewport.is-zoomed .ph-board{min-width:790px}.ph-board image{image-rendering:auto}
.ph-board.ph-rounded,.ph-board.ph-rounded image{image-rendering:auto;shape-rendering:geometricPrecision}.ph-rounded .ph-arrow,.ph-rounded .ph-connector,.ph-rounded .ph-trace{stroke-linecap:round;stroke-linejoin:round}
.ph-experiment{display:flex;flex-wrap:wrap;gap:12px;padding:12px;margin-bottom:12px;border:1px solid var(--line);background:var(--paper)}.ph-experiment[hidden]{display:none!important}.ph-experiment-control{display:grid;gap:6px;flex:1 1 200px;font-size:13px;font-weight:650}.ph-experiment-control select{width:100%;min-height:44px;padding:7px;background:var(--surface);border:1px solid var(--line);color:var(--ink)}.ph-experiment-control input{width:100%;min-height:44px;accent-color:var(--ink)}.ph-experiment-value{font-size:12px;font-weight:400}.ph-experiment-notice{flex-basis:100%;margin:0;font-size:11px;line-height:1.7;color:var(--muted)}
.ph-label{font-size:24px;font-weight:700;fill:#173e33;paint-order:stroke;stroke:#f7f5eb;stroke-width:5px;stroke-linejoin:round}.ph-small-label{font-size:20px}.ph-connector{stroke:#526b5f;stroke-width:1.5;fill:none}.ph-ray{stroke:#ba8127;stroke-width:3;fill:none}.ph-arrow{stroke:#2f7477;stroke-width:4;fill:none}.ph-trace{fill:none;stroke-width:6;stroke-linejoin:round;stroke-linecap:round}.ph-oxygenated{stroke:#af5845}.ph-deoxygenated{stroke:#387e92}
.ph-legend{display:flex;gap:14px;flex-wrap:wrap;padding:10px 0;font-size:12px;line-height:1.6}.ph-controls{display:flex;gap:7px;flex-wrap:wrap;align-items:center;margin:8px 0}.ph-control{font-size:12px;padding:8px 10px}.ph-speed{font-size:12px;display:flex;align-items:center;gap:6px}.ph-speed select{min-height:44px;border:1px solid var(--line);background:var(--paper);padding:6px;color:var(--ink)}.ph-control:disabled{opacity:.45;cursor:not-allowed}.ph-control[aria-pressed=true]{background:var(--sage);border-width:2px}.ph-progress-label{font-size:12px;display:block;margin:16px 0}.ph-progress-label input{display:block;width:100%;accent-color:var(--ink);min-height:44px;margin:0}.ph-runtime{font-size:12px;color:var(--muted);min-height:36px;line-height:1.8}
.ph-detail{min-width:0}.ph-step-kicker{font:12px/1.6 ui-monospace,monospace;color:var(--muted);margin:0 0 8px}.ph-detail h2{font-size:24px;margin:0}.ph-english{font-size:12px;color:var(--muted);margin:5px 0 17px}.ph-brief{font-size:16px;line-height:1.8}.ph-mechanism{font-size:14px;line-height:1.85}.ph-detail h3{font-size:14px;border-top:3px solid var(--ink);padding-top:14px;margin:20px 0 8px}.ph-live-facts{display:grid;gap:8px;margin:12px 0}.ph-fact{font-size:12px;line-height:1.7;margin:0;padding:9px 12px;background:var(--paper);border-left:2px solid var(--line)}.ph-fact strong,.ph-fact span{display:block}.ph-sources{font-size:11px;line-height:1.7;border-top:1px solid var(--line);padding-top:10px;margin-top:18px}.ph-sources strong,.ph-sources a{display:block;overflow-wrap:anywhere}.ph-sources a{color:var(--ink);margin-top:5px}
.ph-valve-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:12px 0}.ph-valve{padding:10px;border:1px solid var(--line);background:var(--paper);font-size:12px;line-height:1.6}.ph-valve strong,.ph-valve span{display:block}.ph-valve[data-open=true]{border-color:#397c64;background:#e3ecde}.ph-pressure{font-size:12px;font-weight:650;line-height:1.75;padding:10px 12px;background:var(--sage);margin:10px 0}
.ph-phase-select{display:grid;gap:7px;font-size:12px;margin:10px 0}.ph-phase-select select{width:100%;min-height:44px;background:var(--paper);color:var(--ink);border:1px solid var(--line);padding:8px}.ph-heart-phase{font-size:12px;line-height:1.8;padding:10px 12px;background:var(--sage);margin:10px 0}.ph-count-note{font-size:12px;color:var(--muted);line-height:1.8}.ph-practice{margin-top:14px}
.ph-valve-image{display:block;width:100%;max-height:70px;aspect-ratio:10/7;image-rendering:auto}
.ph-timeline{margin:28px 0}.ph-timeline h2,.ph-teaching-notes h2{font-size:21px}.ph-stage-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.ph-stage{font-size:13px!important;min-height:48px;padding:10px;border:1px solid var(--line);background:var(--surface);color:var(--ink);text-align:left;cursor:pointer}.ph-stage.is-current{border:2px solid var(--ink);background:var(--sage)}.ph-teaching-notes{margin:24px 0}.ph-teaching-notes details{border-top:1px solid var(--line);padding:13px 0}.ph-teaching-notes summary{font-size:14px;cursor:pointer;min-height:44px;font-weight:650}.ph-teaching-notes p{font-size:14px;line-height:1.85;max-width:950px}.physiology-lab button:hover:not(:disabled){box-shadow:inset 0 -2px var(--ink)}.physiology-lab button:focus-visible,.physiology-lab input:focus-visible,.physiology-lab select:focus-visible,.physiology-lab summary:focus-visible{outline:3px solid var(--focus,#936d24);outline-offset:3px}
.structure-entry .actions{justify-content:flex-start;flex-wrap:wrap;margin-top:8px;gap:6px}
@media(max-width:1240px){.desktop-nav{display:none}.mobile-menu-button{display:block}}
@media(max-width:760px){.ph-heading h1{font-size:25px}.ph-topic-tabs{grid-template-columns:1fr 1fr;gap:8px}.ph-topic{font-size:13px!important;padding:10px}.ph-study{grid-template-columns:1fr;padding:14px;gap:18px}.ph-stage-list{grid-template-columns:1fr 1fr}.ph-stage{font-size:12px!important}.ph-controls .ph-control{flex:1 1 calc(33% - 7px)}.ph-detail h2{font-size:23px}.ph-model-note{font-size:11px}.ph-live-facts{grid-template-columns:1fr 1fr}.ph-fact{font-size:11px;padding:9px}.ph-brief{font-size:15px}}
@media(max-width:700px){#physiology{width:calc(100% - 24px);margin-top:18px}.animation-library-nav{width:calc(100% - 24px);margin-top:18px}}
@media(max-width:480px){.ph-label{font-size:30px}.ph-small-label{font-size:26px}}
@media(prefers-reduced-motion:reduce){.physiology-lab *{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{#physiology,.animation-library-nav{display:none!important}}