html, body { margin: 0; height: 100%; background: #0a1420; font-family: "Microsoft YaHei", system-ui, sans-serif; }
#viewer { position: absolute; inset: 0; }

#topbar {
  position: absolute; top: 0; left: 0; right: 0; height: 56px; z-index: 10;
  display: flex; align-items: baseline; gap: 14px; padding: 10px 22px;
  background: linear-gradient(180deg, rgba(6,20,36,.92), rgba(6,20,36,0));
  pointer-events: none;
}
#topbar .brand { color: #e8f4ff; font-size: 22px; font-weight: 700; letter-spacing: 2px; }
#topbar .sub { color: #7fa8c9; font-size: 13px; }

#panel {
  position: absolute; top: 72px; left: 16px; width: 210px; z-index: 10;
  background: rgba(8, 24, 40, 0.86); border: 1px solid rgba(90,140,190,.35);
  border-radius: 8px; padding: 12px 14px; color: #cfe3f5; backdrop-filter: blur(4px);
}
.panel-title { font-size: 13px; color: #6fa8d8; margin: 10px 0 6px; letter-spacing: 1px; }
.panel-title:first-child { margin-top: 0; }
.layer { display: block; font-size: 14px; padding: 4px 0; cursor: pointer; }
.layer input { margin-right: 8px; accent-color: #2f8fd8; }
.muted { color: #7d99b5; font-size: 12px; margin-top: 8px; }
.small { line-height: 1.6; }
#presets button {
  display: inline-block; margin: 3px 4px 3px 0; padding: 4px 10px; font-size: 12px;
  color: #cfe3f5; background: rgba(47,143,216,.18); border: 1px solid rgba(90,140,190,.4);
  border-radius: 4px; cursor: pointer;
}
#presets button:hover { background: rgba(47,143,216,.4); }
.cesium-widget-credits { display: none !important; }