#app {
  --bg-primary: #fbfbfd;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f5f6f8;
  --bg-hover: #eef0f3;
  --border: #e5e5e7;
  --text-primary: #1d1d1f;
  --text-secondary: #515154;
  --text-muted: #86868b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-dim: rgba(37, 99, 235, 0.10);
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 4px 18px rgba(16, 24, 40, .04);
  --transition: 0.2s ease;
}
#app * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
#app {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}
#app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}
#app .app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
#app .app-title {
  font-size: 24px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}
#app .app-title .icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
#app .app-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-left: 12px;
}
#app .upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 60px 20px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-secondary);
}
#app .upload-area:hover, #app .upload-area.dragover {
  border-color: var(--accent);
  background: var(--accent-dim);
}
#app .upload-icon {
  font-size: 48px;
  margin-bottom: 16px;
}
#app .upload-text {
  font-size: 16px;
  color: var(--text-secondary);
}
#app .upload-hint {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 8px;
}
#app .workspace {
  display: none;
  gap: 20px;
}
#app .workspace.active {
  display: block;
}
#app .preview-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
#app .preview-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
#app .panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
}
#app .panel-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
}
#app .panel-badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 12px;
  background: var(--accent-dim);
  color: var(--accent);
}
#app .video-wrapper {
  position: relative;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}
#app .video-wrapper video {
  max-width: 100%;
  max-height: 450px;
  display: block;
}
#app .canvas-wrapper {
  position: relative;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  background-image:
    linear-gradient(45deg, #e3e3e8 25%, transparent 25%),
    linear-gradient(-45deg, #e3e3e8 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #e3e3e8 75%),
    linear-gradient(-45deg, transparent 75%, #e3e3e8 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, 10px 0px;
  background-color: #ffffff;
}
#app .canvas-wrapper canvas {
  max-width: 100%;
  max-height: 450px;
  display: block;
}
#app .click-hint {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.75);
  color: #fff;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  pointer-events: none;
  white-space: nowrap;
  animation: pulse 2s infinite;
}
@keyframes pulse {

  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}
#app .panel-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
#app .btn-crop-toggle {
  background: var(--bg-hover);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
#app .btn-crop-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}
#app .btn-crop-toggle.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
#app .crop-overlay {
  position: absolute;
  display: none;
  pointer-events: none;
}
#app .crop-overlay.active {
  display: block;
  pointer-events: auto;
}
#app .crop-rect {
  position: absolute;
  border: 2px solid #fff;
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.5);
  cursor: move;
  box-sizing: border-box;
}
#app .crop-handle {
  position: absolute;
  width: 12px;
  height: 12px;
  background: #fff;
  border: 1px solid #9ca3af;
  border-radius: 2px;
  z-index: 10;
}
#app .crop-handle[data-handle="nw"] { top: -6px; left: -6px; cursor: nwse-resize; }
#app .crop-handle[data-handle="n"] { top: -6px; left: 50%; transform: translateX(-50%); cursor: ns-resize; }
#app .crop-handle[data-handle="ne"] { top: -6px; right: -6px; cursor: nesw-resize; }
#app .crop-handle[data-handle="e"] { top: 50%; right: -6px; transform: translateY(-50%); cursor: ew-resize; }
#app .crop-handle[data-handle="se"] { bottom: -6px; right: -6px; cursor: nwse-resize; }
#app .crop-handle[data-handle="s"] { bottom: -6px; left: 50%; transform: translateX(-50%); cursor: ns-resize; }
#app .crop-handle[data-handle="sw"] { bottom: -6px; left: -6px; cursor: nesw-resize; }
#app .crop-handle[data-handle="w"] { top: 50%; left: -6px; transform: translateY(-50%); cursor: ew-resize; }
#app .crop-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
#app .crop-presets {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
#app .crop-preset {
  background: var(--bg-hover);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  cursor: pointer;
  transition: var(--transition);
}
#app .crop-preset:hover {
  border-color: var(--accent);
  color: var(--accent);
}
#app .crop-preset.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}
#app .crop-dimensions {
  font-size: 12px;
  color: var(--text-muted);
  font-family: monospace;
  margin-left: auto;
}
#app .controls-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}
#app .controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
#app .control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
#app .control-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}
#app .control-value {
  font-size: 12px;
  color: var(--accent);
  font-weight: 600;
  font-family: 'Consolas', monospace;
}
#app .color-display {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
#app .color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  border: 2px solid var(--border);
  flex-shrink: 0;
  background: transparent;
  background-image:
    linear-gradient(45deg, #c9c9d1 25%, transparent 25%),
    linear-gradient(-45deg, #c9c9d1 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #c9c9d1 75%),
    linear-gradient(-45deg, transparent 75%, #c9c9d1 75%);
  background-size: 8px 8px;
  background-position: 0 0, 0 4px, 4px -4px, 4px 0px;
}
#app .color-swatch-inner {
  width: 100%;
  height: 100%;
  border-radius: 4px;
}
#app .color-info {
  flex: 1;
  font-size: 12px;
  color: var(--text-secondary);
}
#app .color-info .hex {
  font-family: 'Consolas', monospace;
  font-weight: 600;
  color: var(--text-primary);
}
#app input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
}
#app input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
}
#app input[type="range"]::-webkit-slider-thumb:hover {
  background: var(--accent-hover);
  transform: scale(1.15);
}
#app input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}
#app .toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
}
#app .toggle {
  position: relative;
  width: 44px;
  height: 24px;
  background: var(--bg-tertiary);
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border);
}
#app .toggle.active {
  background: var(--accent);
  border-color: var(--accent);
}
#app .toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: #fff;
  border-radius: 50%;
  transition: var(--transition);
}
#app .toggle.active::after {
  left: 22px;
}
#app .playback-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border);
}
#app .playback-controls button {
  background: var(--bg-hover);
  border: 1px solid var(--border);
  color: var(--text-primary);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: var(--transition);
}
#app .playback-controls button:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
}
#app .timeline {
  flex: 1;
  height: 6px;
  background: var(--bg-hover);
  border-radius: 3px;
  position: relative;
  cursor: pointer;
}
#app .timeline-progress {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  width: 0%;
  transition: width 0.1s linear;
}
#app .time-display {
  font-size: 12px;
  color: var(--text-muted);
  font-family: 'Consolas', monospace;
  min-width: 80px;
  text-align: right;
}
#app .export-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
#app .export-panel h3 {
  font-size: 15px;
  margin-bottom: 16px;
  color: var(--text-primary);
}
#app .export-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
#app .export-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
}
#app .export-card h4 {
  font-size: 14px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
#app .export-card .desc {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 14px;
  line-height: 1.5;
}
#app .export-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 14px;
}
#app .select-wrapper {
  position: relative;
}
#app select {
  width: 100%;
  padding: 8px 32px 8px 12px;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 13px;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
}
#app select:focus {
  outline: none;
  border-color: var(--accent);
}
#app .select-wrapper::after {
  content: '▼';
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 10px;
  color: var(--text-muted);
  pointer-events: none;
}
#app .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  width: 100%;
}
#app .btn-primary {
  background: var(--accent);
  color: #fff;
}
#app .btn-primary:hover {
  background: var(--accent-hover);
}
#app .btn-primary:disabled {
  background: var(--bg-hover);
  color: var(--text-muted);
  cursor: not-allowed;
}
#app .btn-secondary {
  background: var(--bg-hover);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
#app .btn-secondary:hover {
  background: var(--border);
}
#app .btn-danger {
  background: rgba(248, 113, 113, 0.15);
  color: var(--danger);
  border: 1px solid rgba(248, 113, 113, 0.3);
}
#app .btn-danger:hover {
  background: rgba(248, 113, 113, 0.25);
}
#app .progress-container {
  display: none;
  margin-top: 14px;
}
#app .progress-container.active {
  display: block;
}
#app .progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-hover);
  border-radius: 4px;
  overflow: hidden;
}
#app .progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #7c3aed);
  border-radius: 4px;
  width: 0%;
  transition: width 0.2s ease;
}
#app .progress-text {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 6px;
  text-align: center;
}
#app .toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  box-shadow: var(--shadow);
  z-index: 9999;
  transition: transform 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}
#app .toast.show {
  transform: translateX(-50%) translateY(0);
}
#app .toast.success {
  border-color: var(--success);
  color: var(--success);
}
#app .toast.error {
  border-color: var(--danger);
  color: var(--danger);
}
@media (max-width: 900px) {
#app .preview-container {
    grid-template-columns: 1fr;
  }
#app .controls-grid {
    grid-template-columns: 1fr;
  }
#app .export-grid {
    grid-template-columns: 1fr;
  }
}
#app .mode-selector {
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
#app .mode-tabs {
  display: flex;
  gap: 8px;
}
#app .mode-tab {
  flex: 1;
  padding: 10px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  user-select: none;
}
#app .mode-tab:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
#app .mode-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
#app .mode-controls {
  display: none;
}
#app .mode-controls.active {
  display: block;
}
#app .ai-status {
  padding: 12px 14px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
}
#app .ai-status.loading {
  border-color: var(--warning);
}
#app .ai-status.ready {
  border-color: var(--success);
  color: var(--success);
}
#app .ai-status.error {
  border-color: var(--danger);
  color: var(--danger);
}
#app .spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
}
@keyframes spin {

  to { transform: rotate(360deg); }
}
#app .capture-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
}
#app .capture-btn:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
}
#app .capture-btn.captured {
  border-style: solid;
  border-color: var(--success);
  color: var(--success);
}
#app .bg-preview-thumb {
  width: 100%;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  margin-top: 8px;
  display: none;
}
#app .bg-preview-thumb.show {
  display: block;
}

/* ============ 与站点风格对齐的图标与标题 ============ */
#app svg { vertical-align: -0.15em; }
#app .app-title .icon { color: #fff; }
#app .upload-icon { color: var(--accent); margin-bottom: 16px; line-height: 1; }
#app .mode-tab svg, #app .export-card h4 svg, #app .panel-title svg, #app .ai-status svg { vertical-align: -3px; margin-right: 2px; }
#app .upload-icon svg { width: 56px; height: 56px; }