:root{
  --gold:#b8975a; --panel:rgba(10,15,12,.88); --panel-soft:rgba(10,15,12,.70); --border:rgba(255,255,255,.18);
}
*{box-sizing:border-box}
html,body{margin:0;width:100%;height:100%;background:#000;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
body{overflow:hidden} button{font:inherit}
#app{position:relative;width:100%;height:100%;background:#000;overflow:hidden}
#viewer{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;cursor:grab}
#viewer.dragging{cursor:grabbing}
.topbar{position:absolute;left:0;right:0;top:0;z-index:20;min-height:66px;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;background:linear-gradient(to bottom,rgba(0,0,0,.70),rgba(0,0,0,0));pointer-events:none}
.brand{color:#fff;font-weight:750;letter-spacing:.04em;font-size:clamp(15px,2.2vw,20px);text-shadow:0 2px 14px rgba(0,0,0,.7)}
.room-title{color:white;font-family:Georgia,"Times New Roman",serif;font-size:clamp(18px,3vw,28px);font-weight:700;text-shadow:0 2px 14px rgba(0,0,0,.65);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.controls{position:absolute;right:14px;bottom:14px;z-index:25;display:flex;gap:10px}
.control-btn,.gallery-toggle{border:1px solid var(--border);background:var(--panel);color:white;min-width:46px;height:46px;border-radius:999px;padding:0 15px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:650;font-size:14px;line-height:1;cursor:pointer;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.control-btn{padding:0;width:46px;font-size:23px}
.gallery-toggle .grid-icon{font-size:20px;line-height:1}
.control-btn:active,.gallery-toggle:active{transform:scale(.98)}
.gallery-panel{position:absolute;left:0;right:0;bottom:0;z-index:22;padding:16px 82px 16px 16px;background:linear-gradient(to top,rgba(0,0,0,.96),rgba(0,0,0,.78));border-top:1px solid var(--border);transform:translateY(105%);transition:transform .28s ease;max-height:44%;overflow:auto}
.gallery-panel.open{transform:translateY(0)}
.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;max-width:1100px;margin:0 auto}
.thumb{appearance:none;border:1px solid var(--border);border-radius:10px;overflow:hidden;background:#111;color:white;padding:0;text-align:left;cursor:pointer}
.thumb[aria-current="true"]{outline:2px solid var(--gold);outline-offset:1px}
.thumb img{display:block;width:100%;aspect-ratio:2/1;object-fit:cover;background:#222}
.thumb span{display:block;padding:9px 10px;font-size:13px;font-weight:650;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hint{position:absolute;left:50%;bottom:76px;z-index:21;transform:translateX(-50%);color:white;background:var(--panel-soft);border:1px solid var(--border);border-radius:999px;padding:9px 14px;font-size:13px;white-space:nowrap;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);transition:opacity .25s ease,transform .25s ease;pointer-events:none}
.hint.hide{opacity:0;transform:translate(-50%,8px)}
.loading,.error{position:absolute;inset:0;z-index:50;display:grid;place-items:center;background:#0c0f0d;color:white;text-align:center;padding:24px}
.loading-card,.error-card{max-width:520px}
.loading-card strong,.error-card strong{display:block;font-size:20px;margin-bottom:8px}
.loading-card span,.error-card span{color:#c8cec9;font-size:14px;line-height:1.5}
.error{display:none}
@media (max-width:640px){
  .topbar{padding:10px 12px;min-height:58px}.brand{font-size:15px;max-width:32vw}.room-title{font-size:18px;max-width:54vw}
  .controls{right:10px;bottom:10px;gap:8px}.control-btn,.gallery-toggle{height:44px;min-width:44px;font-size:13px}
  .control-btn{width:44px;font-size:21px;padding:0}.gallery-panel{padding:14px 64px 14px 12px;max-height:52%}
  .thumbs{display:flex;gap:10px;overflow-x:auto;padding-bottom:4px}.thumb{flex:0 0 150px}.hint{bottom:66px;font-size:12px;padding:8px 12px}
}
@media (prefers-reduced-motion:reduce){.gallery-panel,.hint{transition:none}}