* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; font-family: "Microsoft YaHei", sans-serif; background: #000; }
#sky { display: block; width: 100vw; height: 100vh; cursor: grab;
  background: radial-gradient(ellipse at center, #060a1f 0%, #02030a 60%, #000 100%); }
#sky:active { cursor: grabbing; }

#hint {
  position: fixed; top: 15px; left: 50%; transform: translateX(-50%);
  color: #88a; font-size: 13px; z-index: 100;
  background: rgba(0,0,0,0.5); padding: 6px 16px; border-radius: 20px;
  pointer-events: none;
}

#info {
  position: fixed; top: 20px; right: 20px; width: 320px;
  background: rgba(10, 15, 40, 0.92); color: #e0e8ff;
  border: 1px solid #3a4a8a; border-radius: 10px; padding: 20px;
  z-index: 200; display: none; backdrop-filter: blur(8px);
  box-shadow: 0 4px 30px rgba(80,120,255,0.3);
}
#info.show { display: block; }
#info h2 { color: #ffeb3b; margin-bottom: 12px; border-bottom: 1px solid #3a4a8a; padding-bottom: 8px; }
#info p { margin: 6px 0; font-size: 13px; line-height: 1.6; }
#info b { color: #88aaff; }
#desc { margin-top: 12px !important; padding-top: 10px; border-top: 1px solid #3a4a8a; color: #c0d0ff; }
#closeBtn {
  position: absolute; top: 8px; right: 10px; background: none; border: none;
  color: #aac; font-size: 22px; cursor: pointer;
}
#closeBtn:hover { color: #fff; }

#panel {
  position: fixed; top: 20px; left: 20px; width: 240px;
  background: rgba(10, 15, 40, 0.88); color: #e0e8ff;
  border: 1px solid #3a4a8a; border-radius: 10px; padding: 14px 16px;
  z-index: 200; backdrop-filter: blur(8px); font-size: 13px;
}
#panel .row { margin: 8px 0; display: flex; flex-direction: column; gap: 4px; }
#panel label { color: #aac; cursor: pointer; }
#panel input[type=range] { width: 100%; accent-color: #88aaff; }
#panel input[type=checkbox] { accent-color: #88aaff; margin-right: 6px; vertical-align: middle; }
#panel .coord { font-family: Consolas, monospace; color: #ffeb3b; font-size: 12px;
  background: rgba(0,0,0,0.3); padding: 6px 8px; border-radius: 4px; }