@charset "UTF-8";
:root{font:16px/1.5 "Microsoft YaHei","PingFang SC",system-ui,sans-serif;color:#eef0ee;background:#151c24;color-scheme:dark;--gold:#e4bd79;--muted:#acb8c2;--line:#ffffff20}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button{cursor:pointer;color:inherit;border:1px solid var(--line);background:#17222dcc;border-radius:5px;padding:9px 15px;touch-action:manipulation}button:hover{background:#33404b;border-color:#c5a266}button:focus-visible,a:focus-visible,canvas:focus-visible{outline:3px solid #f1c989;outline-offset:3px}[hidden]{display:none!important}a{color:var(--gold)}#courseware{height:100dvh;min-height:450px;display:grid;grid-template-rows:72px minmax(210px,1fr) 98px 38px;overflow:hidden}header{display:flex;align-items:center;justify-content:space-between;padding:0 28px;border-bottom:1px solid var(--line);gap:20px}.brand{color:var(--gold);font-size:26px;white-space:nowrap}.brand strong{font-size:20px;font-weight:500;letter-spacing:.14em;color:#eef0ee;margin:0 12px}.brand small{font-size:13px;color:var(--muted)}.tools{display:flex;gap:8px}.tools button{font-size:14px;border-color:transparent}button[aria-pressed=true]{border-color:#e4bd7970;color:var(--gold);background:#e4bd7914}#hall-wrap{position:relative;overflow:hidden;background:radial-gradient(#725030,#211c18)}canvas{width:100%;height:100%;display:block}.scene-title{position:absolute;left:28px;top:19px;pointer-events:none;padding:12px 16px;background:#131a20b3;border-left:2px solid var(--gold);font-size:17px;backdrop-filter:blur(8px)}.scene-title small{font-size:13px;display:block;color:#d0c5b4;margin-top:3px}.style-note{position:absolute;right:20px;bottom:15px;font-size:12px;color:#ddd2b8;background:#171b2080;padding:3px 8px}#pins{position:absolute;inset:0;pointer-events:none}.pin{position:absolute;transform:translate(-50%,-100%);pointer-events:auto;background:#16212bed;border-color:#e4bd797f;box-shadow:0 4px 20px #0005;white-space:nowrap;padding:7px 11px;color:#fff3db;font-size:14px}.primary{background:var(--gold);color:#24201a;font-weight:600;border-color:var(--gold)}.primary:hover{background:#f2d199;color:#24201a}#scene-start{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);display:flex;gap:12px;white-space:nowrap}#start-button{padding:13px 25px}#skip-button{position:absolute;right:25px;bottom:40px}#scene-error{position:absolute;top:35%;left:15%;right:15%;padding:25px;background:#15202fee;border:1px solid #e4bd79}#instrument-nav{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));padding:13px 25px;gap:12px;border-top:1px solid var(--line)}#instrument-nav button{display:flex;align-items:center;text-align:left;gap:15px;border:0;border-right:1px solid var(--line);border-radius:0;padding:7px 14px;color:var(--gold)}#instrument-nav button:last-child{border:0}#instrument-nav em{font:22px Georgia,serif;color:#bb955e}#instrument-nav span{flex:1}#instrument-nav strong{font-size:18px;font-weight:500;display:block;color:#f0f0e8}#instrument-nav small{font-size:12px;color:var(--muted);display:block;margin-top:4px}footer{font-size:13px;display:flex;align-items:center;justify-content:space-between;padding:0 30px;color:var(--muted);border-top:1px solid var(--line)}dialog{padding:0;width:min(1220px,94vw);max-width:94vw;max-height:94dvh;color:#f2f0e9;background:#1c252e;border:1px solid #857355;border-radius:9px;box-shadow:0 30px 150px #000a}dialog::backdrop{background:#080d14c7;backdrop-filter:blur(6px)}.viewer-header{height:88px;display:flex;align-items:center;justify-content:space-between;padding:18px 28px;border-bottom:1px solid var(--line)}.viewer-header small{font-size:12px;color:var(--gold)}h1{font:28px/1.3 "Songti SC","SimSun",serif;margin:3px 0 0;letter-spacing:.12em}.close{font-size:28px;line-height:1;width:38px;height:38px;padding:0;border-radius:50%;color:#bdc6cb}.viewer-layout{display:grid;grid-template-columns:minmax(0,1fr) 295px}#viewer-wrap{height:min(60vh,620px);min-height:320px;position:relative;background:radial-gradient(ellipse at 45% 35%,#415162,#18232f);overflow:hidden}#model-canvas{touch-action:none}.viewer-tabs{position:absolute;top:18px;left:20px;display:flex;background:#16212bbf;border:1px solid var(--line);border-radius:5px;gap:3px;padding:3px}.viewer-tabs button{font-size:14px;border:0;padding:7px 13px}.view-controls{position:absolute;right:17px;bottom:48px;display:flex;gap:8px}.view-controls button{font-size:13px}.gesture-hint{position:absolute;bottom:12px;margin:0;width:100%;text-align:center;color:#bac6d0;font-size:13px;pointer-events:none}aside{padding:35px 28px;background:#202a33;display:flex;flex-direction:column;justify-content:center;border-left:1px solid var(--line)}.eyebrow{color:var(--gold);font-size:13px;letter-spacing:.14em;margin:0 0 16px}aside h2{font-size:23px;font-weight:500;margin:0 0 14px}#structure-note{font-size:15px;color:#bfc7ca;margin:0 0 22px;line-height:1.8}aside>button{width:100%;margin-bottom:10px;min-height:44px}#sound-status{font-size:14px;color:#dbc9a8;margin:10px 0 22px}.subtle{font-size:13px;color:var(--muted);line-height:1.8;margin:5px 0 18px}.return{border:0;color:var(--gold)}#sound-indicator{color:#6e7b86;letter-spacing:3px}#sound-indicator.playing{color:var(--gold);animation:sound .7s alternate infinite}@keyframes sound{to{opacity:.35}}#viewer-instrument-nav{display:flex;justify-content:center;gap:9px;padding:16px;border-top:1px solid var(--line)}#viewer-instrument-nav button{font-size:14px;min-width:90px}.settings-content{padding:28px}.settings-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}.settings-heading h2{font-size:23px;margin:0}#settings-dialog{width:620px}.settings-content p{line-height:1.8;color:#bfc7ca}.volume{display:flex;gap:25px;align-items:center}.volume input{flex:1;accent-color:var(--gold)}.file-label{display:flex;flex-direction:column;gap:12px;color:var(--gold)}input[type=file]{font-size:14px;max-width:100%}hr{border:0;border-top:1px solid var(--line);margin:24px 0}
@media(max-width:1000px){header{padding:0 15px}.brand small{display:none}.tools{gap:2px}.tools button{padding:8px;font-size:13px}.viewer-layout{grid-template-columns:minmax(0,1fr) 235px}aside{padding:24px 20px}#instrument-nav{padding:10px;gap:2px}#instrument-nav button{padding:6px 10px;gap:9px}}
@media(max-width:650px){#courseware{grid-template-rows:60px minmax(230px,1fr) 80px 34px}.brand{font-size:22px}.brand strong{font-size:16px;margin:0 6px}header{padding:0 9px;gap:8px}.tools button{font-size:12px;padding:6px}#entrance-button{display:none}.scene-title{padding:8px 10px;top:10px;left:10px;font-size:14px}.scene-title small{font-size:12px}.pin{font-size:12px;padding:5px 7px}#instrument-nav{padding:8px 4px;gap:0}#instrument-nav button{padding:4px;gap:0;font-size:0}#instrument-nav em{display:none}#instrument-nav strong{font-size:14px}#instrument-nav small{font-size:11px}footer{padding:0 12px;font-size:12px}footer>span:last-child{display:none}.viewer-header{height:70px;padding:12px 17px}h1{font-size:25px}.viewer-layout{grid-template-columns:1fr}#viewer-wrap{height:45dvh;min-height:270px}aside{padding:14px 18px;display:grid;grid-template-columns:1fr 1fr;gap:8px 12px}aside .eyebrow,#structure-note,aside .subtle,#sound-indicator{display:none}aside h2{font-size:18px;margin:0}aside #sound-status{margin:0;font-size:13px;text-align:right}aside>button{margin:0;min-height:39px}.return{grid-column:1/-1;padding:5px}#viewer-instrument-nav{padding:10px 8px;gap:4px}#viewer-instrument-nav button{min-width:0;flex:1;padding:7px 4px;font-size:12px}.viewer-tabs{top:12px;left:12px}.viewer-tabs button{font-size:12px;padding:7px 10px}.view-controls{right:12px;bottom:39px}.gesture-hint{font-size:12px}.style-note{font-size:11px}#scene-start{bottom:38px;gap:8px}#start-button{padding:10px 13px;font-size:14px}}
@media(max-height:580px) and (orientation:landscape){#courseware{grid-template-rows:48px minmax(140px,1fr) 64px 26px;min-height:300px}.scene-title small{display:none}.scene-title{top:8px;padding:6px 10px}#instrument-nav{padding:4px 15px}#instrument-nav strong{font-size:15px}#instrument-nav small{margin:0}.viewer-header{height:62px}.viewer-layout{grid-template-columns:minmax(0,1fr) 230px}#viewer-wrap{height:58dvh;min-height:200px}aside{padding:12px 17px;display:flex}aside h2{font-size:19px}#structure-note,aside .eyebrow,aside .subtle,#sound-indicator{display:none}#sound-status{margin:7px 0 12px}aside>button{min-height:34px;padding:6px;margin-bottom:6px}#viewer-instrument-nav{padding:7px}.viewer-tabs{top:9px;left:9px}#scene-start{bottom:12px}.style-note{display:none}}
@media(prefers-reduced-motion:reduce){*{animation:none!important}}

/* The hall uses a wide 2D still panorama; not a 360 equirectangular map. WebGL is confined to the instrument dialog. */
#hall-wrap{touch-action:none;cursor:grab}#hall-wrap:active{cursor:grabbing}#hall-world{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);overflow:hidden}.hall-layer{position:absolute;inset:0;width:100%;height:100%;object-fit:fill}#entrance-video{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;background:#100d0a;z-index:4}.scene-title{z-index:5}#scene-start,#skip-button{z-index:6}.viewer-tabs span{padding:6px 12px;color:#e4bd79;font-size:14px}#percussion-dialog{width:800px}#percussion-choices{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:22px 0}#percussion-choices button{padding:24px 12px;color:#e4bd79;font-size:20px}@media(max-width:650px){#percussion-choices{grid-template-columns:repeat(2,1fr)}}

/* Fixed-point photo panorama. Hotspots are projected from spherical coordinates. */
#hall-world{inset:0;width:100%;height:100%;left:0;top:0;transform:none}#panorama-canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;cursor:grab}#panorama-canvas:active{cursor:grabbing}#panorama-image{object-fit:cover;pointer-events:none}#pins{z-index:2}.style-note{pointer-events:none;z-index:3}

/* The first paint is the AI film; panorama and instrument shortcuts appear afterwards. */
.intro-mode #entrance-video{position:fixed;inset:0;width:100vw;height:100dvh;z-index:30;object-fit:contain;background:#100d0a}
.intro-mode header,.intro-mode #instrument-nav,.intro-mode footer{visibility:hidden;pointer-events:none}
.intro-mode .scene-title,.intro-mode .style-note{display:none}
.intro-mode #scene-start{position:fixed;left:50%;top:50%;bottom:auto;transform:translate(-50%,-50%);z-index:32}
.intro-mode #direct-button{display:none}
.intro-mode #skip-button{position:fixed;right:22px;bottom:22px;z-index:32}