:root{--panel: rgba(8, 22, 40, .85);--border: rgba(160, 200, 255, .35);--accent: #5fb8ff;--text: #eef5ff;--muted: #b9cde6}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,system-ui,sans-serif;color:var(--text);overflow:hidden;background:#0a1626}#app{width:100vw;height:100vh;position:relative}#scene{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;display:block}#topbar{position:absolute;top:0;left:0;right:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px}#topbar .left{display:flex;align-items:center;gap:10px}#back-link{color:var(--text);text-decoration:none;font-size:20px;border:1px solid var(--border);background:var(--panel);border-radius:8px;padding:2px 10px}#back-link:hover{color:var(--accent);border-color:var(--accent)}h1{font-size:17px;text-shadow:0 1px 6px rgba(0,0,0,.45)}.lang-switch{display:flex;gap:4px}.lang-switch button,#play-btn,#info-close{background:var(--panel);border:1px solid var(--border);color:var(--text);border-radius:99px;padding:6px 12px;font-size:13px;cursor:pointer}.lang-switch button.active{background:var(--accent);color:#06223c;font-weight:700}#hint{position:absolute;top:54px;left:50%;transform:translate(-50%);z-index:9;font-size:13px;color:var(--text);background:var(--panel);border:1px solid var(--border);border-radius:99px;padding:6px 16px;max-width:92vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}#stage-labels button{position:absolute;z-index:8;transform:translate(-50%,-50%);background:var(--panel);border:1px solid var(--border);color:var(--text);border-radius:99px;padding:7px 14px;font-size:14px;font-weight:600;cursor:pointer;transition:transform .15s,border-color .15s}#stage-labels button:hover{transform:translate(-50%,-50%) scale(1.08);border-color:var(--accent)}#info-panel{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:20;width:420px;max-width:calc(100vw - 40px);background:var(--panel);border:1px solid var(--accent);border-radius:16px;padding:20px 22px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:0 12px 60px #00000080}#info-panel h2{font-size:19px;color:var(--accent);margin-bottom:10px}#info-panel p{font-size:15px;line-height:1.65}#info-close{margin-top:14px}#controls{position:absolute;left:0;right:0;bottom:0;z-index:10;display:flex;align-items:center;justify-content:center;gap:22px;padding:12px 16px 16px;flex-wrap:wrap}#controls label{display:flex;align-items:center;gap:8px;font-size:13px;background:var(--panel);border:1px solid var(--border);border-radius:99px;padding:7px 14px}#controls input[type=range]{width:130px;accent-color:var(--accent)}@media (max-width: 640px){h1{font-size:14px}#controls{gap:8px}}