/* 画笔批注条 — 跟随站点 data-theme CSS 变量 */
.museum-brush-bar {
  position: fixed;
  left: 50%;
  bottom: max(56px, calc(env(safe-area-inset-bottom, 0px) + 48px));
  transform: translateX(-50%);
  z-index: 140;
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(20, 28, 36, 0.88);
  border: 1px solid color-mix(in srgb, var(--site-accent, #2f5f8a) 55%, transparent);
  box-shadow: 0 8px 28px var(--site-shadow, rgba(0, 0, 0, 0.28));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  pointer-events: auto;
  user-select: none;
  -webkit-user-select: none;
}

html[data-theme] .museum-brush-bar {
  border-color: color-mix(in srgb, var(--site-accent, #2f5f8a) 65%, #fff 10%);
}

.museum-brush-bar.is-visible {
  display: flex;
}

.museum-brush-bar .mb-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  padding: 0 12px;
  border: 0;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #fff;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.museum-brush-bar .mb-btn:active {
  transform: scale(0.96);
}

.museum-brush-bar .mb-btn-brush {
  background: color-mix(in srgb, var(--site-accent, #2f5f8a) 85%, #000);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.museum-brush-bar.is-active .mb-btn-brush {
  background: var(--site-accent, #2f5f8a);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.35);
}

.museum-brush-bar .mb-btn-clear {
  background: color-mix(in srgb, var(--site-danger, #c05050) 75%, #5a2a1a);
}

.museum-brush-bar .mb-btn svg {
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
}

.museum-brush-bar .mb-colors {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 4px;
}

.museum-brush-bar .mb-color {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.35);
  padding: 0;
  cursor: pointer;
  box-sizing: border-box;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.museum-brush-bar .mb-color.is-selected {
  box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--site-accent, #dfb268);
  transform: scale(1.12);
}

.museum-brush-bar .mb-colors,
.museum-brush-bar .mb-btn-clear {
  opacity: 0.35;
  pointer-events: none;
}

.museum-brush-bar.is-active .mb-colors,
.museum-brush-bar.is-active .mb-btn-clear {
  opacity: 1;
  pointer-events: auto;
}

.museum-brush-overlay {
  position: fixed;
  inset: 0;
  z-index: 135;
  display: none;
  background: rgba(0, 0, 0, 0.72);
  touch-action: none;
  overscroll-behavior: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-user-drag: none;
}

.museum-brush-overlay.is-open {
  display: block;
}

.museum-brush-viewport {
  position: absolute;
  inset: 0;
  overflow: hidden;
  cursor: crosshair;
  touch-action: none;
}

.museum-brush-stage {
  position: absolute;
  left: 50%;
  top: 50%;
  transform-origin: center center;
  will-change: transform;
  -webkit-user-drag: none;
}

.museum-brush-base,
.museum-brush-draw {
  display: block;
  position: absolute;
  left: 0;
  top: 0;
  max-width: none;
  pointer-events: none;
  -webkit-user-drag: none;
  user-select: none;
}

.museum-brush-hint {
  position: fixed;
  left: 50%;
  top: 18px;
  transform: translateX(-50%);
  z-index: 141;
  display: none;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 12px;
  color: #fff;
  background: rgba(0, 0, 0, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.18);
  pointer-events: none;
}

.museum-brush-hint.is-show {
  display: block;
}

@media (max-width: 520px) {
  .museum-brush-bar {
    gap: 8px;
    padding: 7px 10px;
    max-width: calc(100vw - 16px);
  }
  .museum-brush-bar .mb-btn {
    padding: 0 10px;
    font-size: 12px;
  }
  .museum-brush-bar .mb-color {
    width: 16px;
    height: 16px;
  }
}