:root {
  --hud-bg: rgba(17, 26, 36, 0.72);
  --hud-border: rgba(255, 255, 255, 0.16);
  --hud-text: #f8fafc;
  --hud-muted: #cbd5e1;
  --accent: #2bb3a9;
  --accent-hover: #38c9be;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #10212b;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--hud-text);
  user-select: none;
}

#canvas-wrap {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
}

#canvas-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: radial-gradient(circle at 50% 42%, #1d3b4c 0%, #0e1e28 100%);
  transition: opacity 0.45s ease, visibility 0.45s ease;
}

.loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid rgba(255, 255, 255, 0.18);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.85s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hud-header {
  position: fixed;
  top: 20px;
  left: 22px;
  z-index: 10;
  padding: 12px 16px;
  border-radius: 14px;
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  backdrop-filter: blur(12px);
  pointer-events: none;
}

.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.4px;
  color: #7ce8df;
  margin-bottom: 4px;
}

.hud-header h1 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.hud-header p {
  font-size: 12px;
  color: var(--hud-muted);
  margin-top: 3px;
}
.hud-Dock {
  position: fixed;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 16px;
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  backdrop-filter: blur(14px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.28);
  max-width: calc(100vw - 24px);
}

.control-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.control-group.cameras {
  padding-left: 10px;
  border-left: 1px solid var(--hud-border);
}

.hud-btn, .cam-btn {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.08);
  color: var(--hud-text);
  font-size: 12px;
  font-weight: 500;
  padding: 7px 12px;
  border-radius: 9px;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.12s ease;
  white-space: nowrap;
}

.hud-btn:hover, .cam-btn:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.3);
}

.hud-btn:active, .cam-btn:active {
  transform: scale(0.97);
}

.hud-btn.primary, .cam-btn.active {
  background: var(--accent);
  border-color: var(--accent-hover);
  color: #062624;
  font-weight: 600;
}

@media (max-width: 720px) {
  .hud-header {
    top: 12px;
    left: 12px;
    right: 12px;
    padding: 10px 13px;
  }
  .hud-header h1 { font-size: 15px; }
  .control-group.cameras {
    padding-left: 0;
    border-left: none;
  }
}