:root {
    --bg-main: #f3f4f6;
    --bg-panel: #ffffff;
    --bg-panel-dark: #111827;
    --text-main: #0f172a;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --accent: #2563eb;
    --accent-soft: #dbeafe;
    --danger: #b91c1c;
  }
  
  body.theme-dark {
    --bg-main: #020617;
    --bg-panel: #020617;
    --text-main: #e5e7eb;
    --border-color: #1f2937;
  }
  
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg-main);
    color: var(--text-main);
  }
  
  .app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-panel);
    position: sticky;
    top: 0;
    z-index: 10;
  }
  
  .app-header-left h1 {
    font-size: 1.1rem;
    margin: 0;
  }
  
  .app-header-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .badge {
    padding: 0.1rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
  }
  
  .badge-privacy {
    background: var(--accent-soft);
    color: var(--accent);
  }
  
  .app-header-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .app-main {
    display: grid;
    grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
    gap: 1rem;
    padding: 1rem;
  }
  
  .panel {
    background: var(--bg-panel);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    padding: 1rem;
    min-height: 0;
    display: flex;
    flex-direction: column;
  }
  
  .panel-left {
    max-height: calc(100vh - 5rem);
    overflow-y: auto;
  }
  
  .panel-right {
    max-height: calc(100vh - 5rem);
    overflow: hidden;
  }
  
  h2 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 1rem;
  }
  
  .field-group {
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.75rem;
    margin-bottom: 0.75rem;
  }
  
  .field-group legend {
    padding: 0 0.25rem;
    font-weight: 600;
  }
  
  .field-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.85rem;
  }
  
  input[type="file"],
  input[type="url"],
  textarea {
    width: 100%;
    padding: 0.35rem 0.4rem;
    font-size: 0.85rem;
    border-radius: 0.35rem;
    border: 1px solid var(--border-color);
    background: var(--bg-panel);
    color: var(--text-main);
  }
  
  input[type="range"] {
    width: 100%;
  }
  
  textarea {
    resize: vertical;
  }
  
  .help-text {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
  }
  
  .button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
  }
  
  .btn {
    border-radius: 0.35rem;
    border: 1px solid transparent;
    padding: 0.35rem 0.7rem;
    font-size: 0.85rem;
    cursor: pointer;
    background: var(--accent);
    color: white;
  }
  
  .btn-sm {
    padding: 0.2rem 0.6rem;
    font-size: 0.8rem;
  }
  
  .btn-block {
    width: 100%;
    margin-top: 0.5rem;
  }
  
  .btn-secondary {
    background: #6b7280;
  }
  
  .btn-outline {
    background: transparent;
    color: var(--text-main);
    border-color: var(--border-color);
  }
  
  .btn-ghost {
    background: transparent;
    color: var(--text-main);
    border-color: transparent;
  }
  
  .btn-link {
    background: transparent;
    border-color: transparent;
    color: var(--accent);
    padding: 0;
  }
  
  .btn:hover {
    opacity: 0.9;
  }
  
  .tabs {
    display: flex;
    gap: 0.25rem;
    border-bottom: 1px solid var(--border-color);
  }
  
  .tab {
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    color: var(--text-muted);
  }
  
  .tab.active {
    border-bottom-color: var(--accent);
    color: var(--accent);
  }
  
  .tab-panels {
    flex: 1;
    overflow: auto;
    padding-top: 0.5rem;
  }
  
  .tab-panel {
    display: none;
  }
  
  .tab-panel.active {
    display: block;
  }
  
  .overlay-container {
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    overflow: hidden;
    position: relative;
  }
  
  .overlay-inner {
    position: relative;
    width: 100%;
    max-height: 70vh;
    overflow: hidden;
  }
  
  .overlay-inner canvas {
    display: block;
    max-width: 100%;
  }
  
  .overlay-inner #originalCanvas {
    position: relative;
    z-index: 1;
  }
  
  .overlay-ela {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    overflow: hidden;
    z-index: 2;
    width: 50%;
  }
  
  .overlay-ela canvas {
    display: block;
  }
  
  .overlay-divider {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent);
    z-index: 3;
    left: 50%;
    cursor: ew-resize;
  }
  
  canvas {
    max-width: 100%;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    background: #000;
  }
  
  .metadata-block {
    margin-bottom: 1rem;
  }
  
  .metadata-block pre {
    max-height: 200px;
    overflow: auto;
    font-size: 0.75rem;
    background: #02061711;
    padding: 0.5rem;
    border-radius: 0.35rem;
  }
  
  .metadata-flags {
    list-style: none;
    padding-left: 1rem;
    font-size: 0.8rem;
  }
  
  .metadata-flags li {
    margin-bottom: 0.2rem;
  }
  
  .summary-text {
    font-size: 0.85rem;
    line-height: 1.5;
  }
  
  .status-bar {
    border-top: 1px solid var(--border-color);
    padding: 0.4rem 0.6rem;
    font-size: 0.8rem;
    margin-top: 0.5rem;
  }
  
  .status-info {
    background: #e5e7eb33;
  }
  
  .status-error {
    background: #fee2e2;
    color: #991b1b;
  }
  
  .status-success {
    background: #dcfce7;
    color: #166534;
  }
  
  .app-footer {
    padding: 0.5rem 1rem 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
  }
  
  .about.hidden {
    display: none;
  }
  
  .about {
    margin-top: 0.5rem;
    padding: 0.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
  }
  
  /* Responsive */
  
  @media (max-width: 900px) {
    .app-main {
      grid-template-columns: minmax(0, 1fr);
    }
    .panel-left {
      max-height: none;
      order: 1;
    }
    .panel-right {
      max-height: none;
      order: 2;
    }
  }