*{margin:0;padding:0;box-sizing:border-box}html,body{width:100%;height:100%;overflow:hidden;background:#1a1a2e}#app{width:100%;height:100%;position:relative}canvas{width:100%;height:100%;display:block}#loading{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;font-family:system-ui,sans-serif;gap:16px;transition:opacity .4s}#loading.hidden{opacity:0;pointer-events:none}.spinner{width:40px;height:40px;border:3px solid rgba(255,255,255,.2);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}#error{position:absolute;top:0;right:0;bottom:0;left:0;display:none;flex-direction:column;align-items:center;justify-content:center;color:#ff6b6b;font-family:system-ui,sans-serif;gap:8px;padding:20px;text-align:center}#error.visible{display:flex}#hotspots{position:absolute;bottom:24px;left:50%;transform:translate(-50%);display:flex;gap:8px;z-index:10;pointer-events:auto;max-width:calc(100% - 32px)}#hotspots.overflow .hotspot-btn-inline{display:none}#hotspots.overflow .hotspot-toggle{display:flex}.hotspot-toggle{display:none;align-items:center;justify-content:center;width:44px;height:44px;background:#0009;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.15);border-radius:50%;color:#fff;font-size:20px;cursor:pointer;user-select:none;-webkit-user-select:none;transition:background .2s,transform .15s}.hotspot-toggle:hover{background:#fff3}.hotspot-toggle:active{transform:scale(.95)}.hotspot-menu{display:none;position:absolute;bottom:56px;left:50%;transform:translate(-50%);flex-direction:column;gap:4px;padding:8px;background:#000000b3;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.15);border-radius:16px;max-height:60vh;overflow-y:auto;min-width:160px}.hotspot-menu.open{display:flex}.hotspot-btn{display:flex;align-items:center;gap:6px;padding:6px 14px;background:#0009;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.15);border-radius:20px;color:#fff;font-family:system-ui,sans-serif;font-size:13px;cursor:pointer;transition:background .2s,transform .15s;white-space:nowrap;user-select:none;-webkit-user-select:none}.hotspot-btn:hover{background:#fff3;transform:scale(1.05)}.hotspot-btn:active{transform:scale(.97)}.hotspot-dot{width:8px;height:8px;border-radius:50%;background:#4fc3f7;flex-shrink:0}