:root{color-scheme:dark;--ink:#f0f1f2;--muted:#bac0c9;--accent:#ee8a77;--panel:#181d23;--line:#ffffff26}
*{box-sizing:border-box}
body{margin:0;background:#11151a;color:var(--ink);font-family:"Segoe UI","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
body[data-scene="hangar"]{--ink:#fff7eb;--muted:#ede4d6;--accent:#ffd3a1}
body[data-scene="clouds"]{--ink:#142b40;--muted:#334e64;--accent:#a33025;--line:#142b4033}
button,a,summary{-webkit-tap-highlight-color:transparent}
button{font:inherit;color:inherit;cursor:pointer;touch-action:manipulation}
button:disabled{opacity:.45;cursor:wait}
a{color:inherit;text-decoration:none}
button:focus-visible,a:focus-visible,summary:focus-visible,canvas:focus-visible{outline:2px solid var(--accent);outline-offset:5px}
button svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;display:block}
.exhibit{position:relative;height:100svh;min-height:400px;overflow:hidden;isolation:isolate}
.viewer,#canvas-host{position:absolute;inset:0}
.viewer{touch-action:none}
.viewer canvas{width:100%;height:100%;display:block;outline-offset:-8px}
.fallback{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;opacity:1;transition:opacity .4s;background:#0d121a}
.fallback.loaded{opacity:0;pointer-events:none}
.scene-shade{position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,#080c124f,transparent 25%,transparent 68%,#080c12b3);transition:opacity .7s}
body[data-scene="hangar"] .scene-shade{background:linear-gradient(180deg,#060d14c2,transparent 28%,transparent 68%,#080c12b3)}
body[data-scene="clouds"] .scene-shade{background:linear-gradient(180deg,#e0edf878,transparent 25%,transparent 65%,#d9e8f5cf)}
.scene-transition{position:absolute;inset:0;z-index:4;background:#11151a;opacity:0;pointer-events:none;transition:opacity .38s ease}
.scene-transition.active{opacity:1}
.header{position:absolute;top:max(32px,env(safe-area-inset-top));left:4.5%;right:4.5%;display:flex;justify-content:space-between;align-items:flex-start;gap:24px;z-index:5;pointer-events:none}
.identity h1{margin:0;display:flex;align-items:baseline;gap:18px;font-size:27px;font-weight:500;letter-spacing:3px;line-height:1.4}
.identity h1 span{font-size:12px;font-weight:400;letter-spacing:2px;color:var(--muted)}
.identity p{font-size:10px;letter-spacing:2px;margin:8px 0 0;color:var(--muted)}
.menu-button{pointer-events:auto;display:flex;align-items:center;gap:14px;border:0;background:transparent;padding:8px 0 8px 12px;min-height:44px;font-size:12px}
.menu-button:hover{color:var(--accent)}
.scene-caption{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.stage-footer{position:absolute;bottom:max(28px,env(safe-area-inset-bottom));left:4.5%;right:4.5%;display:flex;justify-content:space-between;align-items:center;gap:24px;z-index:5;border-top:1px solid var(--line);padding-top:18px}
.scene-buttons{display:flex;gap:32px}
.scene-buttons button{position:relative;display:flex;align-items:center;gap:10px;min-height:44px;padding:0;background:transparent;border:0;font-size:13px;letter-spacing:1px;color:var(--muted)}
.scene-buttons button::after{content:"";position:absolute;left:0;right:0;bottom:-3px;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .25s ease}
.scene-buttons button[aria-pressed="true"]::after{transform:scaleX(1)}
.scene-buttons button:hover,.scene-buttons button[aria-pressed="true"]{color:var(--ink)}
.stage-actions{display:flex;gap:12px}
.stage-actions button{border:0;background:transparent;min-width:44px;min-height:44px;display:grid;place-items:center;border-radius:6px}
.stage-actions button:hover{background:#80808026}
.load-status{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;pointer-events:none}
.load-status p{font-size:13px;background:#11151ae6;color:#f0f1f2;padding:12px 20px;max-width:85%;text-align:center;border-radius:4px;line-height:1.7}
.load-status button{pointer-events:auto;background:#181d23;border:1px solid #697481;color:#fff;padding:12px 20px}
[hidden]{display:none!important}
.skip-link{position:fixed;top:-100px;left:12px;z-index:10;background:#181d23;color:#fff;padding:12px}
.skip-link:focus{top:12px}
 dialog{--ink:#eff1f3;--muted:#bec6cf;--accent:#ee8a77;--line:#ffffff26;color:var(--ink);background:var(--panel);border:1px solid var(--line);padding:0;border-radius:8px;max-height:calc(100svh - 40px);box-shadow:none}
 dialog::backdrop{background:#070b10a6}
.panel-heading{position:sticky;top:0;z-index:1;background:var(--panel);display:flex;align-items:center;justify-content:space-between;gap:24px;padding:22px 28px;border-bottom:1px solid var(--line)}
.panel-heading h2{font-size:17px;font-weight:500;margin:0;letter-spacing:1px}
.panel-heading button{background:transparent;border:0;font-size:28px;min-width:44px;min-height:44px;color:var(--muted)}
.panel-heading button:hover{color:#fff}
.control-panel{width:min(360px,calc(100% - 32px))}
#controls{padding:25px}
.view-buttons,.control-row{display:flex;gap:8px}
.control-row{margin-top:12px}
#controls button{flex:1;min-height:44px;border:1px solid #ffffff30;background:transparent;border-radius:4px;font-size:12px}
#controls button:hover{background:#ffffff0c}
#controls button[aria-pressed="true"]{background:#ffffff12;border-color:#c6ced077;color:#fff}
.zoom-buttons button{font-size:20px!important}
.zoom-buttons #reset{font-size:12px!important;flex:2}
.control-hint{font-size:11px;color:var(--muted);text-align:center;margin:0 0 24px}
.info-panel{width:min(940px,calc(100% - 32px));max-height:calc(100svh - 48px)}
.info-content{padding:10px 32px 32px}
.section{padding-top:25px}
.section-label{display:flex;justify-content:space-between;gap:20px;font-size:10px;color:var(--muted);letter-spacing:1px;margin-bottom:25px}
.story-layout{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center}
.section h2{font-family:"Songti SC","SimSun",serif;font-size:28px;font-weight:400;line-height:1.6;margin:0 0 16px}
.story-layout p,.print-note,.download-heading p{font-size:12px;line-height:2;color:var(--muted)}
.text-link{display:inline-block;color:#f2a391;font-size:11px;text-decoration:underline;text-underline-offset:5px;line-height:1.8}
.profile{margin:0;min-width:0}
.profile img{width:100%;display:block;border-radius:4px}
.profile figcaption{display:flex;justify-content:space-between;gap:10px;font-size:9px;color:var(--muted);margin-top:10px}
.specifications{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;padding:24px 0;margin:28px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.specifications dt{font-size:10px;color:var(--muted);margin-bottom:10px}
.specifications dd{margin:0;font-family:Georgia,"SimSun",serif;font-size:25px}
.specifications small{font:10px "Microsoft YaHei",sans-serif;color:var(--muted)}
.source-note{font-size:11px;line-height:2;color:var(--muted)}
.source-note summary{cursor:pointer;width:fit-content}
.source-note a{text-decoration:underline;text-underline-offset:3px;color:#f2a391}
.source-note ul{padding-left:20px}
.downloads{border-top:1px solid var(--line);margin-top:30px}
.download-heading{display:flex;justify-content:space-between;align-items:center;gap:20px}
.download-list>a{display:flex;align-items:center;gap:20px;border-bottom:1px solid var(--line);padding:20px 0}
.download-list>a:hover{color:#f2a391}
.file-type{font-size:10px;color:#f2a391;width:50px;flex-shrink:0}
.file-label{font-size:14px}
.file-label small{display:block;font-size:10px;color:var(--muted);margin-top:6px;line-height:1.6}
.file-action{margin-left:auto;font-size:11px;flex-shrink:0}
@media(max-width:700px){
 .header{top:max(22px,env(safe-area-inset-top));left:6%;right:6%}
 .identity h1{font-size:22px;gap:12px;letter-spacing:2px}
 .identity h1 span{font-size:10px}
 .identity p{font-size:9px;letter-spacing:1px}
 .menu-button{padding-top:0}
 .menu-button span{display:none}
 .stage-footer{left:6%;right:6%;bottom:max(18px,env(safe-area-inset-bottom));flex-direction:column;align-items:stretch;gap:10px;padding-top:12px}
 .scene-buttons{gap:0;justify-content:space-between}
 .scene-buttons button{font-size:12px;letter-spacing:.5px;gap:8px}
 .stage-actions{align-self:flex-end;gap:8px}
 .panel-heading{padding:14px 20px}
 .info-content{padding:10px 22px 24px}
 .story-layout{grid-template-columns:1fr;gap:24px}
 .section-label span:last-child{display:none}
 .section h2{font-size:25px}
 .specifications{grid-template-columns:1fr 1fr;row-gap:24px}
 .download-heading{display:block}
 .download-list>a{gap:12px}
 .file-type{width:40px;font-size:9px}
 .file-label{font-size:12px}
 .file-label small{font-size:9px}
 .file-action{font-size:10px}
}
@media(max-height:500px) and (min-width:701px){.header{top:18px}.stage-footer{bottom:12px;padding-top:8px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;scroll-behavior:auto!important}}