:root{color-scheme:dark;--bg:#071320;--panel:#101f30;--line:#2a4056;--muted:#a4b7ca;--blue:#57b9ff;--green:#a3e8ca}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 75% 0,#19364c 0,transparent 45%),var(--bg);color:#eef5fb;font:15px/1.5 system-ui,sans-serif}button,input,select,textarea{font:inherit}button,a,input,textarea,select{outline-offset:4px}button{cursor:pointer;border:1px solid var(--line);border-radius:8px;color:#e3eef9;background:#193046;padding:10px 14px;transition:background .15s}button:hover:not(:disabled){background:#294964}button:disabled{opacity:.45;cursor:default}button.primary{background:#4bb5ff;color:#061726;font-weight:750;border-color:#4bb5ff}a{color:#86d4ff}header{min-height:90px;padding:16px 3vw;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:16px;background:#071320c9}.brand{display:flex;align-items:center;gap:13px;text-decoration:none;color:inherit;font-weight:800;letter-spacing:.04em;margin-right:auto}.brand img{width:50px;height:54px;object-fit:contain}.brand small{display:block;font-size:10px;font-weight:500;letter-spacing:.24em;color:var(--muted)}.session-light{color:var(--green);font-size:11px;letter-spacing:.1em;padding:7px 12px;border:1px solid #3a695c;border-radius:30px;white-space:nowrap}main{max-width:1760px;margin:auto;padding:28px 3vw}.intro{display:flex;justify-content:space-between;align-items:center;gap:32px;margin-bottom:28px}h1{font-size:clamp(32px,4vw,54px);font-weight:650;line-height:1.05;letter-spacing:-.05em;margin:12px 0}h2,h3,p{margin:0 0 12px}h2{line-height:1.15;letter-spacing:-.02em;font-size:28px}h3{font-size:18px}p{color:var(--muted)}.eyebrow{font-size:10px;letter-spacing:.18em;font-weight:750;color:#a8dbfc;margin-bottom:10px}.course-picker{width:340px;flex-shrink:0}label{display:block;font-size:12px;color:var(--muted);margin:9px 0}input:not([type=checkbox]),textarea,select{max-width:100%;width:100%;background:#081522;border:1px solid var(--line);border-radius:7px;padding:12px;color:white}select{font-size:16px}small,.small{font-size:11px;color:var(--muted)}.studio{display:grid;grid-template-columns:205px minmax(360px,1fr) 320px;gap:20px;align-items:start}.lesson-rail{padding:18px 0}.lesson-rail button{border:0;width:100%;display:flex;text-align:left;background:transparent;margin:4px 0;gap:12px;padding:13px 10px;line-height:1.35}.lesson-rail button[aria-current=true]{background:#163750;box-shadow:inset 3px 0 var(--blue)}.lesson-rail button span:first-child{color:var(--blue);font-size:12px}.rail-note{border-top:1px solid var(--line);padding-top:24px;margin:25px 12px}.rail-note p,.lesson-rail>a{font-size:12px}.rail-note span{font-size:11px;color:var(--green)}.stage,.prof-panel{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--panel)}.scene-shell{position:relative}.scene-shell #classroom-scene{height:360px;background:#203641}.scene-shell canvas{width:100%;height:100%;display:block}.scene-caption{position:absolute;left:18px;top:16px;pointer-events:none;display:flex;flex-direction:column;text-shadow:0 1px 6px #000}.scene-caption span{font-size:9px;letter-spacing:.12em;color:#c5e6f8}.scene-caption b{font-size:20px;margin-top:3px}.scene-controls{position:absolute;bottom:12px;left:12px;right:12px;display:flex;gap:5px}.scene-controls button{font-size:11px;padding:7px 9px;background:#092136d9}.scene-controls button:last-child{margin-left:auto}.lesson-body{padding:24px}.lesson-meta{display:flex;justify-content:space-between;gap:15px;font-size:9px;letter-spacing:.09em;color:#a1c5e1;margin-bottom:14px}.lesson-meta span:last-child{color:#efc996}.spoken{font-size:16px;line-height:1.65;border-left:2px solid var(--blue);padding:8px 16px;color:#dceaf6;margin:20px 0;min-height:100px}.transport{display:flex;gap:8px;flex-wrap:wrap}.transport button{font-size:12px}.takeback{border-color:#bd687b;color:#ffd4db;background:#342330}.next-row{display:flex;gap:10px;justify-content:space-between;align-items:center;margin:18px 0;font-size:10px;color:var(--muted)}.next-row button{font-size:11px;background:transparent;padding:7px}details{border-top:1px solid var(--line);padding:14px 0;font-size:12px}summary{cursor:pointer;color:var(--muted)}details p{font-size:11px;margin-top:8px}details a{display:inline-block;margin:5px 12px 5px 0}.discussion{border-top:1px solid var(--line);margin-top:10px;padding-top:20px}#answers{display:grid;gap:8px}#answers button{text-align:left;background:#0b1a29;font-size:13px}#answers button.selected{border-color:var(--blue);background:#163750}#feedback{font-size:12px;padding-top:10px;color:var(--green)}.prof-panel{padding:18px}.prof-identity{display:flex;gap:8px;align-items:center}.prof-identity h2{font-size:30px;margin:3px 0}.prof-identity .eyebrow{font-size:8px}#prof-avatar{width:105px;height:140px;flex-shrink:0}#prof-avatar canvas{width:100%;height:100%;display:block}.assistant-tabs{display:flex;border-bottom:1px solid var(--line);margin:10px -18px 20px;padding:0 10px}.assistant-tabs button{border:0;border-radius:0;background:transparent;padding:10px;font-size:12px}.assistant-tabs button[aria-pressed=true]{color:var(--blue);border-bottom:2px solid var(--blue)}.prof-panel p{font-size:12px}.check{display:flex;align-items:flex-start;gap:8px;font-size:11px}.check input{margin-top:4px;accent-color:#57b9ff}.wide{width:100%;margin:9px 0}.transcript{padding:12px;max-height:180px;overflow:auto;background:#081522;margin:16px 0;font-size:12px;border-radius:8px;white-space:pre-wrap}.prof-panel form button{margin-top:8px;width:100%;font-size:12px}.prof-panel #clear-transcript{margin-top:12px;font-size:11px;background:transparent}.prof-panel dl{font-size:12px}.prof-panel dt{font-weight:bold;margin-top:15px}.prof-panel dd{margin:4px 0;color:var(--muted)}#suggestion{margin-top:14px;font-size:12px;color:var(--green)}#suggestion button{display:block;margin-top:8px}#materials button{display:block;width:100%;text-align:left;margin-top:6px;font-size:11px}#media-preview img,#media-preview video,#media-preview audio{width:100%;margin:12px 0;max-height:250px;object-fit:contain}#library-results{font-size:12px;margin:15px 0;overflow-wrap:anywhere}#library-results article{border-top:1px solid var(--line);padding:10px 0}#library-results p{white-space:pre-wrap}footer{padding:30px 0;display:flex;gap:20px;justify-content:space-between;color:var(--muted);font-size:10px;letter-spacing:.04em}.skip{position:fixed;top:-80px;left:10px;z-index:20;background:white;color:black;padding:12px}.skip:focus{top:10px}[hidden]{display:none!important}body.projector .lesson-rail,body.projector .prof-panel,body.projector .intro,body.projector footer{display:none}body.projector .studio{grid-template-columns:1fr;max-width:1400px;margin:auto}body.projector .scene-shell #classroom-scene{height:48vh}body.projector .spoken{font-size:22px}body.projector .lesson-body{padding:26px 40px}#scene-fallback{padding:100px 30px;color:white}@media(max-width:1150px){.studio{grid-template-columns:minmax(340px,1fr) 300px}.lesson-rail{grid-column:1/-1;padding:0}.lesson-rail #lesson-list{display:flex}.lesson-rail button{flex:1}.rail-note,.lesson-rail>a,.lesson-rail>.eyebrow{display:none}.intro{align-items:flex-start}header{gap:8px}.brand{font-size:12px}.brand img{width:38px}header button{font-size:11px}}@media(max-width:760px){main{padding:18px 14px}.studio{display:flex;flex-direction:column;gap:14px}.stage,.prof-panel,.lesson-rail{width:100%}.intro{display:block}.course-picker{width:100%;margin-top:20px}header{flex-wrap:wrap;padding:12px}.session-light{font-size:9px}header .brand{flex:1 1 60%}.lesson-rail #lesson-list{flex-wrap:wrap}.lesson-rail button{min-width:40%;font-size:12px}.scene-shell #classroom-scene{height:310px}.lesson-body{padding:18px}.lesson-meta{font-size:8px}.transport button{flex:1}.transport .primary{flex-basis:100%}.next-row{flex-wrap:wrap}.next-row span{order:3;width:100%;text-align:center}footer{flex-wrap:wrap}.prof-identity{justify-content:center}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}