:root{--paper:#f0ede6;--sheet:#f8f5ee;--ink:#242626;--muted:#6b6d68;--line:#d0cec5;--accent:#681c2c;--stage:#1c2023;--mono:'SFMono-Regular',Consolas,'Liberation Mono',monospace;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button{cursor:pointer;color:inherit;border:0}button,a,input{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid #8b4050;outline-offset:4px}button:disabled{cursor:default}button:hover:not(:disabled){filter:brightness(1.08)}[hidden]{display:none!important}a{color:var(--accent)}button{transition:background .15s,color .15s}.topbar{height:58px;margin:0 28px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--ink);gap:20px}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-family:Georgia,'Times New Roman',serif;font-size:30px;letter-spacing:-1.7px;font-weight:700}.brand-period{color:var(--accent)}.brand-mark{width:28px;height:28px;fill:none;stroke:var(--accent);stroke-width:2;stroke-linejoin:round}.header-location{font-family:var(--mono);font-size:9px;letter-spacing:1.2px;color:#656760;display:flex;gap:24px}.header-location span{color:#a09f95}.text-button{background:none;display:flex;align-items:center;gap:16px;font-size:11px;padding:7px 0}.text-button span{font-size:19px}main{max-width:1800px;margin:auto;padding:0 28px}.heading-row{min-height:92px;display:flex;align-items:center;justify-content:space-between;gap:25px}.title-block{display:flex;align-items:center;gap:20px}.chapter-number{align-self:center;color:var(--accent);font-family:Georgia,serif;font-style:italic;font-size:37px;letter-spacing:-3px;width:38px;border-right:1px solid var(--line);padding-right:53px}.eyebrow,.small-eyebrow{font-family:var(--mono);font-size:9px;font-weight:400;letter-spacing:1.2px;color:var(--muted)}h1{font-size:29px;line-height:1.1;font-weight:500;letter-spacing:-1.3px;margin:6px 0 0}.title-block p{font-size:11px;color:var(--muted);line-height:1.65;margin:8px 0 0 20px;border-left:1px solid var(--line);padding-left:20px}.mode-switch{display:flex;border-bottom:1px solid #c2bfb5;align-self:stretch;align-items:center;gap:20px}.mode-switch button{align-self:stretch;background:none;font-size:12px;display:flex;align-items:center;gap:15px;padding:0 3px;position:relative;color:#76786f}.mode-switch button.active{color:var(--ink)}.mode-switch button.active:after{content:'';height:3px;background:var(--accent);position:absolute;left:0;right:0;bottom:-1px}.workspace{height:calc(100dvh - 180px);min-height:560px;display:grid;grid-template-columns:minmax(0,1fr) 338px;border:1px solid #bdbbb3;background:var(--sheet)}.viewer-card{background:var(--stage);min-width:0;display:flex;flex-direction:column;overflow:hidden;color:#e9e9de}.viewer-top{height:44px;padding:0 20px;display:flex;align-items:center;justify-content:space-between;flex-shrink:0;z-index:2;border-bottom:1px solid #ffffff12}.system-tabs{display:flex;gap:24px;height:100%;align-items:stretch}.system-tabs button{background:none;color:#949b9c;padding:0;font-size:12px;position:relative}.system-tabs button.active{color:#faf3df}.system-tabs button.active:after{position:absolute;content:'';height:2px;background:#ed8c63;bottom:0;left:0;right:0}.system-index{font-family:var(--mono);font-size:9px;margin-right:8px;color:#95998f}.system-tabs button.active .system-index{color:#ee946b}.model-tag{font-family:var(--mono);font-size:9px;letter-spacing:1px;color:#a8adaa}.model-tag span{margin:0 8px;color:#636b6b}.scene-wrap{position:relative;flex:1;min-height:300px;overflow:hidden;isolation:isolate;background:radial-gradient(ellipse at 50% 48%,#343b3d 0%,#22282b 52%,#1c2023 90%)}.scene-wrap:after{content:'';position:absolute;inset:20px;border:1px solid #8b999110;border-top:0;border-bottom:0;pointer-events:none}#scene{position:absolute;inset:0}#scene canvas{display:block;width:100%;height:100%;touch-action:none}#point-labels{position:absolute;inset:0;pointer-events:none}.body-marker{position:absolute;transform:translate(-50%,-50%);width:23px;height:23px;display:grid;place-content:center;border:1px solid #e9b49b;border-radius:50%;background:#663524de;color:#ffe6d5;pointer-events:auto;font:10px var(--mono);padding:0;box-shadow:0 0 0 4px #c9774a16;z-index:2}.body-marker.lung{border-color:#a1ced0;background:#255355e8;color:#d6f6f5;box-shadow:0 0 0 4px #80b9bb18}.body-marker.active{background:#ed9c71;color:#222;border-color:#ffe6d5;transform:translate(-160%,-155%);box-shadow:0 0 0 4px #eaa27c20;z-index:3}.body-marker:hover::after,.body-marker:focus-visible::after{content:attr(data-title);position:absolute;left:31px;white-space:nowrap;padding:7px 10px;font:10px Arial,sans-serif;background:#eee9de;color:#222}.orientation{position:absolute;top:20px;left:29px;display:flex;flex-direction:column;gap:10px;pointer-events:none;color:#adb5b5;font:8px var(--mono);letter-spacing:1px}.orientation-caption{font-size:7px;color:#778181;writing-mode:vertical-rl;position:absolute;top:87px;left:0;letter-spacing:2px}.orientation-line{height:34px;border-left:1px solid #737d76;margin-left:3px}#anatomical-side{color:#babeb8}#anatomical-side span{padding:0 10px;color:#707b75}.scene-tools{position:absolute;right:20px;top:17px;display:flex;flex-direction:column;gap:1px}.scene-tools button{width:28px;height:28px;background:#23292c;border:1px solid #495051;color:#c9ceca;font:18px var(--mono)}.scene-hint{position:absolute;bottom:13px;right:20px;color:#98a3a3;font:8px var(--mono);pointer-events:none}.scene-hint i{font-style:normal;margin:0 8px;color:#656e6e}.selected-callout{position:absolute;left:28px;bottom:19px;border-left:2px solid #df855d;padding:3px 0 3px 11px;display:flex;flex-direction:column;gap:5px;pointer-events:none}.selected-callout .small-eyebrow{font-size:7px;color:#b4b7aa}.selected-callout strong{font-size:14px;font-weight:500;color:#faf2de}.selected-callout>span:last-child{font:9px var(--mono);color:#aab5b3}.view-controls{height:39px;flex-shrink:0;padding:0 19px;display:flex;align-items:center;justify-content:space-between;border-top:1px solid #ffffff14;border-bottom:1px solid #ffffff14;background:#212628;gap:14px}.segmented{display:flex;gap:1px}.segmented button{background:none;color:#8b9494;font-size:10px;padding:6px 10px;border:1px solid transparent}.segmented button.active{color:#e9e5d7;border-color:#59615f;background:#ffffff05}.toggle-options{display:flex;align-items:center;gap:17px}.switch-label,.bone-control{display:flex;align-items:center;gap:7px;font-size:9px;color:#b6beb9;cursor:pointer;white-space:nowrap}.bone-control{gap:8px}.bone-control input{width:46px;height:2px;accent-color:#d79372}.switch-label input{position:absolute;width:1px;height:1px;opacity:0}.switch{width:18px;height:10px;border:1px solid #727c76;position:relative}.switch:after{content:'';position:absolute;left:2px;top:2px;width:4px;height:4px;background:#89958e;transition:transform .15s}.switch-label input:checked+.switch:after{transform:translateX(8px);background:#f2aa7f}.switch-label input:checked+.switch{border-color:#c28a6a}.switch-label input:focus-visible+.switch{outline:2px solid #f2aa7f;outline-offset:4px}.sound-panel{height:133px;flex-shrink:0;background:#191c1e;padding:13px 20px 12px}.sound-top{display:flex;justify-content:space-between;align-items:center;gap:10px}.sound-top>div{display:flex;gap:16px;align-items:center}.sound-top .small-eyebrow{font-size:8px;color:#bcc1b7}.signal-duration{color:#707a77;margin-left:7px}.sound-status{font:7px var(--mono);letter-spacing:1px;color:#c99f83}.audio-type{font:8px var(--mono);color:#a3aaa4}.wave-wrap{height:44px;margin:7px 0 8px;position:relative}#waveform{width:100%;height:100%;display:block}.wave-placeholder{position:absolute;inset:0;display:grid;place-items:center;font:9px var(--mono);color:#aab2ab;background:#191c1ec9}.playback{display:flex;align-items:center;gap:12px}.play-button{width:30px;height:30px;background:#e68b61;flex-shrink:0;border-radius:50%;display:grid;place-content:center;color:#251d18;font-size:10px}.play-title{display:flex;flex:1;flex-direction:column;gap:3px;min-width:0}.play-title strong{font-size:10px;font-weight:500;color:#dedfd3}.play-title span{font:8px var(--mono);color:#848e87}.chestpiece{border-right:1px solid #444b47;padding-right:10px}.chestpiece button{font-size:9px;padding:5px 7px}.volume-label{display:flex;gap:7px;align-items:center;color:#9aa99f}.volume-label input{width:50px;accent-color:#e39770;height:2px}.learn-panel{min-height:0;overflow-y:auto;scrollbar-width:thin;scrollbar-color:#b7b3a8 transparent;border-left:1px solid #bdbbb3;padding:0 22px;display:flex;flex-direction:column}.lesson-card{padding:21px 0 19px;border-bottom:1px solid var(--line)}.lesson-top{display:flex;align-items:center;justify-content:space-between;gap:6px}.lesson-top .eyebrow{font-size:8px;letter-spacing:1px}.level-badge{font:8px var(--mono);color:#96978b;white-space:nowrap}.lesson-card h2{font:normal 25px Georgia,'Times New Roman',serif;letter-spacing:-.6px;margin:14px 0 7px}.panel-intro{font-size:11px;line-height:1.6;color:#73766c;margin:0 0 15px;max-width:250px}.case-list{border-top:1px solid var(--line)}.case-button{display:flex;align-items:center;gap:12px;width:100%;text-align:left;padding:13px 7px;background:transparent;border-bottom:1px solid var(--line);position:relative}.case-button.active{background:#e6dfd0}.case-button.active:before{content:'';position:absolute;left:-1px;top:0;bottom:0;width:3px;background:var(--accent)}.case-icon{font:10px var(--mono);color:#999a8e;align-self:flex-start;margin-top:2px}.case-button.active .case-icon{color:var(--accent)}.case-text{display:flex;flex:1;flex-direction:column;gap:5px}.case-text strong{font-size:12px;font-weight:500;letter-spacing:-.1px}.case-text span{font-size:9px;color:#797e72}.case-check{font-size:12px;color:transparent}.case-button.active .case-check{color:var(--accent)}.explanation-card{padding:18px 0 21px}.explanation-heading{display:flex;gap:11px;align-items:flex-start}.explanation-icon{font:24px Georgia,serif;color:var(--accent);line-height:1.1}.explanation-heading .eyebrow{font-size:8px}.explanation-heading h3{font-size:13px;line-height:1.3;letter-spacing:-.1px;margin:5px 0 0;font-weight:500}#explanation-text{font-size:11px;line-height:1.75;color:#666e63;margin:12px 0 14px}.listening-tip{padding:10px 12px;background:#e8e5da;border-left:1px solid #aaa588}.tip-label{display:block;font:7px var(--mono);color:#77745f;letter-spacing:.8px;margin-bottom:7px}.listening-tip strong{font-size:11px;line-height:1.55;font-weight:500}.listening-tip p{font-size:10px;line-height:1.65;color:#6e7366;margin:5px 0 0}.point-selector{margin-top:17px}.point-selector .small-eyebrow{font-size:8px}#point-buttons{display:flex;flex-wrap:wrap;gap:5px;margin-top:9px}.point-chip{background:transparent;border:1px solid #c6c7ba;font:9px var(--mono);padding:6px 8px}.point-chip.active{color:var(--accent);border-color:#bc6a4d;background:#f3e4d7}.point-chip.lung.active{color:#347273;border-color:#76a1a1;background:#e1eae3}.compare-button{margin-top:16px;background:transparent;text-align:left;display:flex;align-items:center;gap:10px;width:100%;font-size:10px;padding:10px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.compare-button span{color:var(--accent);font-size:17px}.compare-button.active{color:var(--accent)}.compare-note{font-size:10px;line-height:1.5;margin-top:8px;color:var(--accent)}.practice-note{display:flex;gap:12px;padding:0 0 19px;color:#8b8e80;margin-top:auto}.practice-note>span{font:20px Georgia,serif;color:#aaa98e}.practice-note p{margin:0;font:9px/1.6 var(--mono)}footer{display:flex;justify-content:space-between;gap:20px;font:8px var(--mono);letter-spacing:.6px;color:#929487;padding:10px 0 8px}.footer-dot{padding:0 8px}.loading{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:14px;background:var(--stage);z-index:10;color:#e8e5d5}.loading strong{font-weight:400;font-size:15px}.loading span{font-size:11px;color:#a3ada5;max-width:260px;text-align:center;line-height:1.6}.spinner{width:22px;height:22px;border:1px solid #ffffff25;border-top-color:#e98e68;border-radius:100%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.quiz-progress{display:flex;justify-content:space-between;padding:9px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font:10px var(--mono);color:#71765f}.quiz-instruction{font-size:12px;line-height:1.6}.quiz-options{display:flex;flex-direction:column;gap:7px}.quiz-option{padding:14px 12px;text-align:left;border:1px solid #c6c6b8;background:transparent;font-size:12px}.quiz-option.correct{background:#e1e5d3;border-color:#839362}.quiz-option.wrong{background:#ead7ca;border-color:#bb8468}.quiz-option:disabled{color:#74766b}.quiz-feedback{font-size:12px;line-height:1.6;margin-top:14px}.primary-button{background:var(--ink);color:var(--sheet);width:100%;font-size:11px;text-align:left;padding:13px;margin-top:12px}dialog{width:min(650px,92vw);max-height:85dvh;padding:0;background:var(--sheet);border:1px solid var(--ink);color:var(--ink)}dialog::backdrop{background:#0b1115b5;backdrop-filter:blur(4px)}.dialog-head{padding:25px 28px 18px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.dialog-head h2{font:28px Georgia,serif;margin:8px 0 0}.icon-button{background:none;font-size:25px;padding:3px 8px}.dialog-body{padding:6px 28px 25px;font-size:12px;line-height:1.8;color:#62695e}.dialog-body h3{font-size:13px;color:var(--ink);margin:20px 0 7px;font-weight:500}.dialog-body ul{padding-left:18px}.dialog-body li{margin:8px 0}.toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:#eee7db;color:#793f27;border:1px solid #c27d5b;padding:12px 20px;z-index:100;font-size:12px;max-width:90vw;transition:.2s}.toast.visible{opacity:1;transform:translate(-50%,0)}
@media(min-width:1500px){.workspace{grid-template-columns:minmax(0,1fr) 380px}.learn-panel{padding:0 28px}.lesson-card{padding:25px 0}.lesson-card h2{font-size:30px}.panel-intro,#explanation-text{font-size:13px}.case-text strong{font-size:14px}.case-text span{font-size:11px}.listening-tip p{font-size:12px}.listening-tip strong{font-size:13px}.explanation-heading h3{font-size:16px}.point-chip{font-size:11px}.compare-button{font-size:12px}.scene-hint{font-size:10px}.selected-callout strong{font-size:18px}}
@media(max-width:1050px){.workspace{grid-template-columns:minmax(0,1fr) 300px}.topbar{margin:0 18px}main{padding:0 18px}.title-block p{display:none}.learn-panel{padding:0 17px}.toggle-options{gap:10px}.bone-control{display:none}.view-controls{padding:0 13px}.scene-hint{font-size:7px}.selected-callout{left:22px}.sound-panel{padding-left:14px;padding-right:14px}.header-location{font-size:8px;gap:12px}.sound-status{display:none}}
@media(max-width:800px){.header-location{display:none}.workspace{height:auto;min-height:0;grid-template-columns:1fr}.viewer-card{height:680px}.learn-panel{overflow:visible;border-left:0;padding:0 24px;display:grid;grid-template-columns:1fr 1fr;column-gap:25px}.lesson-card{border-bottom:0}.explanation-card{border-left:1px solid var(--line);padding-left:23px}.practice-note{grid-column:1/-1}.heading-row{min-height:93px}.bone-control{display:flex}.scene-hint{font-size:8px}.title-block{gap:14px}.chapter-number{font-size:31px;padding-right:40px;width:33px}.mode-switch{gap:14px}h1{font-size:27px}.heading-row .eyebrow{font-size:8px}}
@media(max-width:540px){.topbar{margin:0 15px;height:56px}.brand{font-size:28px}.brand-mark{width:23px}.text-button{font-size:10px;gap:7px}main{padding:0 12px}.heading-row{flex-wrap:wrap;gap:0;padding:18px 3px 0}.title-block{width:100%;gap:13px}.chapter-number{font-size:31px}.heading-row h1{font-size:30px}.heading-row .eyebrow{font-size:8px}.mode-switch{margin-top:15px;height:40px;width:100%;justify-content:space-between;border-bottom:0}.mode-switch button{font-size:12px;padding:0 4px}.mode-switch button.active:after{bottom:0}.viewer-card{height:641px}.viewer-top{height:43px;padding:0 16px}.model-tag{font-size:8px}.system-tabs{gap:20px}.scene-wrap{min-height:0}.scene-tools{right:14px;top:15px}.orientation{left:20px;font-size:7px;top:17px}.orientation-caption{display:none}.scene-wrap:after{inset:14px}.selected-callout{left:20px;bottom:27px}.selected-callout strong{font-size:13px}.selected-callout>span:last-child{font-size:8px}.scene-hint{left:20px;right:auto;font-size:7px;bottom:9px}.view-controls{height:42px;padding:0 10px;gap:6px}.bone-control{display:none}.toggle-options{gap:9px}.switch-label{font-size:8px;gap:4px}.segmented button{font-size:9px;padding:6px 8px}.sound-panel{height:148px;padding:13px 14px}.audio-type{font-size:7px}.signal-duration{font-size:7px}.sound-top .small-eyebrow{font-size:7px}.wave-wrap{height:46px}.playback{gap:9px;flex-wrap:wrap}.play-title strong{font-size:10px}.play-title span{font-size:7px}.chestpiece{border:0;padding:0}.chestpiece button{font-size:8px;padding:5px 6px}.volume-label{width:100%;justify-content:flex-end;margin-top:2px}.volume-label svg{width:11px;height:11px}.volume-label input{width:65px}.learn-panel{display:flex;padding:0 22px}.lesson-card{padding:24px 0 22px;border-bottom:1px solid var(--line)}.lesson-card h2{font-size:29px}.panel-intro{font-size:12px;max-width:none}.case-text strong{font-size:13px}.case-text span{font-size:10px}.case-button{padding:16px 8px}.explanation-card{border:0;padding:23px 0}.explanation-heading h3{font-size:15px}#explanation-text{font-size:13px}.listening-tip strong{font-size:12px}.listening-tip p{font-size:12px}.point-chip{font-size:10px;padding:8px 10px}.compare-button{font-size:12px}.practice-note{font-size:10px}.practice-note p{font-size:10px}footer{font-size:7px;line-height:1.6;gap:9px;padding:12px 3px 15px}.body-marker{width:23px;height:23px;font-size:9px}.dialog-head,.dialog-body{padding-left:20px;padding-right:20px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation-duration:.01ms!important}}
/* The anatomy occupies the full stage; its toolbar floats above it. */
.viewer-card{position:relative}.viewer-top{position:absolute;inset:0 0 auto;height:42px;border-bottom:0;background:linear-gradient(#1c2023ed,#1c202300)}.orientation,.scene-tools{top:56px}.scene-wrap{padding-top:0}.sound-panel{height:123px}.wave-wrap{height:38px;margin-top:5px;margin-bottom:7px}
@media(min-width:801px){.topbar{height:52px}.heading-row{min-height:80px}.workspace{height:calc(100dvh - 160px);min-height:545px}.panel-intro,#explanation-text{font-size:12px}.case-text strong{font-size:13px}.listening-tip p{font-size:11px}.lesson-card h2{font-size:27px}.explanation-heading h3{font-size:14px}.case-text span{font-size:10px}.practice-note{padding-top:5px}}
@media(max-width:540px){.sound-panel{height:148px}.wave-wrap{height:46px;margin:7px 0 8px}.scene-tools{top:53px}.orientation{top:56px}}

/* FiziT: practical, quiet typography around the anatomy. */
.brand{font-family:Arial,Helvetica,sans-serif;font-size:29px;letter-spacing:-1.5px;font-weight:750}.brand-tail{color:var(--accent)}
.header-location{font-family:Arial,Helvetica,sans-serif;font-size:11px;letter-spacing:0;gap:15px}
.title-block{gap:0}.heading-row .eyebrow{font-family:Arial,Helvetica,sans-serif;font-size:11px;letter-spacing:0;text-transform:none;color:#777b73}
h1{font-size:29px;font-weight:500;letter-spacing:-.8px}.lesson-card h2{font-family:Arial,Helvetica,sans-serif;font-size:23px;letter-spacing:-.6px;font-weight:500}
.lesson-top .eyebrow{font-family:Arial,Helvetica,sans-serif;font-size:10px;letter-spacing:.3px}.level-badge{font-family:Arial,Helvetica,sans-serif;font-size:10px;letter-spacing:0;color:#7c8075}
.explanation-heading .eyebrow,.tip-label{font-family:Arial,Helvetica,sans-serif;font-size:10px;letter-spacing:0}.explanation-heading h3{font-weight:500;margin-top:7px}
.listening-tip{background:#ebe9e0;border-left:1px solid #b9b7a8;padding:12px}.practice-note p{font-family:Arial,Helvetica,sans-serif;font-size:11px;line-height:1.6}
footer{font-family:Arial,Helvetica,sans-serif;font-size:9px;letter-spacing:0}.dialog-head h2{font-family:Arial,Helvetica,sans-serif;font-size:25px;font-weight:500}
@media(max-width:540px){.brand{font-size:28px}.heading-row h1{font-size:29px}.heading-row .eyebrow{font-size:11px}.lesson-card h2{font-size:25px}.level-badge{font-size:10px}footer{font-size:8px}.explanation-heading h3{font-size:15px}}

.module-nav{display:flex;gap:24px;height:100%;align-items:stretch}.module-nav a{display:flex;align-items:center;text-decoration:none;color:#74796f;font-size:12px;border-bottom:2px solid transparent;padding:0 3px}.module-nav a[aria-current=page]{color:var(--ink);border-color:var(--accent)}
@media(max-width:540px){.topbar:has(.module-nav){height:auto;min-height:56px;flex-wrap:wrap;padding-top:13px;gap:10px}.topbar .module-nav{order:3;width:100%;height:38px}.topbar:has(.module-nav) .text-button{margin-left:auto}.module-nav a{font-size:12px}}

/* Medara: a flat outlined wordmark; colour is reserved for brand and navigation. */
.brand{color:var(--accent);letter-spacing:0;line-height:1;flex-shrink:0}.brand img{display:block;width:146px;height:38px;max-width:100%}.topbar{border-bottom-color:#b7afa5}.module-nav a[aria-current=page]{border-bottom-width:2px}.text-button{color:#514e49}
@media(max-width:540px){.brand img{width:133px;height:35px}}