/* Monospace Textareas */
    .json-textarea {
      width: 100%;
      min-height: 200px;
      padding: 16px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
      font-size: 0.875rem;
      color: var(--color-text);
      background: var(--color-surface);
      resize: vertical;
      line-height: 1.6;
      outline: none;
      transition: border-color var(--transition-fast);
      tab-size: 2;
      white-space: pre-wrap;
      overflow-wrap: break-word;
      overflow-x: auto;
    }

    .json-textarea:focus {
      border-color: var(--color-primary);
      box-shadow: 0 0 0 3px var(--color-primary-light);
    }

    .json-textarea::placeholder {
      color: var(--color-text-muted);
    }

    /* Section Labels */
    .workspace-label {
      font-size: 0.8rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-text-secondary);
      margin-bottom: 10px;
    }

    /* Regex Input Row */
    .regex-input-row {
      display: flex;
      align-items: center;
      gap: 0;
      margin-bottom: 12px;
    }

    .regex-delimiter {
      padding: 10px 8px;
      background: var(--color-bg);
      border: 1px solid var(--color-border);
      font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
      font-size: 1rem;
      color: var(--color-text-muted);
      line-height: 1.4;
      user-select: none;
    }

    .regex-delimiter:first-child {
      border-radius: var(--radius-sm) 0 0 var(--radius-sm);
      border-right: none;
    }

    .regex-delimiter:last-child {
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      border-left: none;
    }

    .regex-input {
      flex: 1;
      padding: 10px 12px;
      border: 1px solid var(--color-border);
      border-left: none;
      border-right: none;
      font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
      font-size: 0.9rem;
      color: var(--color-text);
      background: var(--color-surface);
      outline: none;
      transition: border-color var(--transition-fast);
      line-height: 1.4;
    }

    .regex-input:focus {
      border-color: var(--color-primary);
    }

    .regex-input-row:focus-within {
      box-shadow: 0 0 0 3px var(--color-primary-light);
      border-radius: var(--radius-sm);
    }

    .regex-input-row:focus-within .regex-delimiter,
    .regex-input-row:focus-within .regex-input {
      border-color: var(--color-primary);
    }

    /* Flags Row */
    .flags-row {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 20px;
      flex-wrap: wrap;
    }

    .flag-checkbox {
      display: flex;
      align-items: center;
      gap: 6px;
      cursor: pointer;
      font-size: 0.85rem;
      color: var(--color-text-secondary);
      font-weight: 500;
    }

    .flag-checkbox input[type="checkbox"] {
      width: 16px;
      height: 16px;
      accent-color: var(--color-primary);
      cursor: pointer;
    }

    .flag-checkbox code {
      font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
      font-size: 0.85rem;
      background: var(--color-bg);
      padding: 1px 5px;
      border-radius: 3px;
      font-weight: 600;
    }

    /* Action Buttons Row */
    .json-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin: 16px 0;
      align-items: center;
    }

    .json-btn {
      padding: 10px 18px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      background: var(--color-surface);
      font-family: var(--font-body);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--color-text-secondary);
      cursor: pointer;
      transition: all var(--transition-fast);
      white-space: nowrap;
    }

    .json-btn:hover {
      border-color: var(--color-primary-subtle);
      color: var(--color-primary);
      background: var(--color-primary-light);
    }

    /* Error Display */
    .json-error {
      display: none;
      margin-top: 12px;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      background: #fef2f2;
      border: 1px solid #fecaca;
      color: #dc2626;
      font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
      font-size: 0.825rem;
      line-height: 1.5;
    }

    .json-error.visible {
      display: flex;
      align-items: flex-start;
      gap: 10px;
    }

    .json-error-icon {
      flex-shrink: 0;
      font-size: 1rem;
      line-height: 1.5;
    }

    /* Match Count Badge */
    .match-count {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      font-weight: 600;
      font-family: var(--font-body);
      margin-bottom: 12px;
    }

    .match-count.has-matches {
      background: #f0fdf4;
      border: 1px solid #bbf7d0;
      color: #16a34a;
    }

    .match-count.no-matches {
      background: #fefce8;
      border: 1px solid #fef08a;
      color: #a16207;
    }

    /* Highlighted Test String */
    .highlight-area {
      width: 100%;
      min-height: 200px;
      padding: 16px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
      font-size: 0.875rem;
      color: var(--color-text);
      background: var(--color-bg);
      line-height: 1.6;
      white-space: pre-wrap;
      overflow-wrap: break-word;
      overflow-x: auto;
      margin-bottom: 16px;
    }

    .highlight-area mark {
      background: #fef08a;
      color: inherit;
      border-radius: 2px;
      padding: 1px 0;
    }

    /* Match List */
    .match-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
      margin-top: 12px;
    }

    .match-card {
      padding: 12px 16px;
      border: 1px solid var(--color-border-light);
      border-radius: var(--radius-sm);
      background: var(--color-surface);
      font-size: 0.85rem;
      line-height: 1.6;
    }

    .match-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 4px;
    }

    .match-card-number {
      font-weight: 700;
      color: var(--color-primary);
      font-size: 0.8rem;
      text-transform: uppercase;
      letter-spacing: 0.03em;
    }

    .match-card-index {
      font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
      font-size: 0.78rem;
      color: var(--color-text-muted);
    }

    .match-card-text {
      font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
      font-size: 0.85rem;
      background: #fef08a;
      padding: 2px 6px;
      border-radius: 3px;
      display: inline-block;
      word-break: break-all;
    }

    .match-card-groups {
      margin-top: 6px;
      padding-top: 6px;
      border-top: 1px solid var(--color-border-light);
      font-size: 0.8rem;
      color: var(--color-text-secondary);
    }

    .match-card-groups span {
      font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
      background: var(--color-bg);
      padding: 1px 5px;
      border-radius: 3px;
      margin-left: 4px;
    }

    /* Output Section */
    .output-section {
      margin-top: 20px;
      padding-top: 20px;
      border-top: 1px solid var(--color-border-light);
    }

    /* Quick Reference Panel */
    .quick-ref {
      margin-top: 24px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      overflow: hidden;
    }

    .quick-ref-toggle {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      padding: 14px 18px;
      background: var(--color-surface);
      border: none;
      cursor: pointer;
      font-family: var(--font-body);
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--color-text-secondary);
      transition: background var(--transition-fast);
    }

    .quick-ref-toggle:hover {
      background: var(--color-primary-light);
      color: var(--color-primary);
    }

    .quick-ref-toggle svg {
      transition: transform var(--transition-fast);
    }

    .quick-ref-toggle.open svg {
      transform: rotate(180deg);
    }

    .quick-ref-body {
      display: none;
      padding: 0;
    }

    .quick-ref-body.open {
      display: block;
    }

    .ref-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.85rem;
    }

    .ref-table th {
      padding: 8px 16px;
      background: var(--color-bg);
      border-bottom: 2px solid var(--color-border);
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-text-muted);
      text-align: left;
    }

    .ref-table td {
      padding: 6px 16px;
      border-bottom: 1px solid var(--color-border-light);
    }

    .ref-table td:first-child {
      font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
      font-weight: 600;
      white-space: nowrap;
    }

    .ref-table tbody tr:hover {
      background: var(--color-primary-light);
    }

    /* Action buttons row */
    .json-actions {
      display: flex;
      gap: 12px;
      margin-top: 16px;
      flex-wrap: wrap;
    }

    /* Responsive */
    @media (max-width: 768px) {
      .json-buttons {
        gap: 6px;
      }

      .json-btn {
        padding: 8px 14px;
        font-size: 0.8rem;
      }

      .json-textarea {
        min-height: 160px;
        font-size: 0.8rem;
      }

      .highlight-area {
        min-height: 160px;
        font-size: 0.8rem;
      }

      .flags-row {
        gap: 12px;
      }
    }

    @media (max-width: 480px) {
      .json-buttons {
        gap: 6px;
      }

      .json-btn {
        flex: 1 1 calc(50% - 6px);
        text-align: center;
        padding: 10px 8px;
      }

      .json-actions {
        flex-direction: column;
      }

      .json-actions .btn {
        width: 100%;
      }

      .regex-input-row {
        flex-wrap: nowrap;
      }

      .flags-row {
        gap: 10px;
      }

      .match-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 2px;
      }
    }