.rdf-root {
    --bg: rgba(255, 255, 255, 0.4);
    --border: rgba(255, 255, 255, 0.6);
    --label: #334155;
    --textarea-bg: #fff;
    --textarea-border: #ddd;
    --textarea-text: #111;
    --controls-bg: rgba(255, 255, 255, 0.7);
    --controls-border: #eaeaea;
    --checkbox-color: #444;

    padding: 2rem;
    background: var(--bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
  }

  .theme-dark .rdf-root {
    --bg: rgba(15, 23, 42, 0.6);
    --border: rgba(255, 255, 255, 0.08);
    --label: #94a3b8;
    --textarea-bg: #0f172a;
    --textarea-border: rgba(255, 255, 255, 0.1);
    --textarea-text: #f1f5f9;
    --controls-bg: rgba(255, 255, 255, 0.03);
    --controls-border: rgba(255, 255, 255, 0.08);
    --checkbox-color: #94a3b8;
  }

  .rdf-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .rdf-panel {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .rdf-label {
    font-weight: 600;
    color: var(--label);
    font-size: 0.95rem;
  }

  .rdf-textarea {
    width: 100%;
    min-height: 220px;
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--textarea-border);
    background: var(--textarea-bg);
    font-size: 1rem;
    color: var(--textarea-text);
    resize: vertical;
    transition: border-color 0.2s;
    line-height: 1.6;
    box-sizing: border-box;
  }

  .rdf-textarea:focus {
    outline: none;
    border-color: #ff4500;
    box-shadow: 0 0 0 3px rgba(255, 69, 0, 0.1);
  }

  .rdf-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    background: var(--controls-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--controls-border);
  }

  .rdf-checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 0.75rem;
    margin-top: 0.25rem;
  }

  .rdf-checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--checkbox-color);
    font-weight: 500;
  }

  .rdf-checkbox-label input[type='checkbox'] {
    width: 1.25rem;
    height: 1.25rem;
    accent-color: #ff4500;
    cursor: pointer;
    flex-shrink: 0;
  }

  .rdf-output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .rdf-copy-btn {
    background: #ff4500;
    color: #fff;
    border: none;
    padding: 0.6rem 1.25rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
  }

  .rdf-copy-btn:hover { background: #e03d00; }
  .rdf-copy-btn:active { transform: scale(0.97); }