/* Input Textarea */
    .case-textarea {
      width: 100%;
      min-height: 180px;
      padding: 16px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-body);
      font-size: 0.95rem;
      color: var(--color-text);
      background: var(--color-surface);
      resize: vertical;
      line-height: 1.7;
      outline: none;
      transition: border-color var(--transition-fast);
    }

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

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

    .case-textarea.output {
      background: var(--color-bg);
    }

    /* 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;
    }

    /* Conversion Buttons Row */
    .case-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin: 20px 0;
    }

    .case-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;
    }

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

    .case-btn.active {
      background: var(--color-primary);
      color: white;
      border-color: var(--color-primary);
      box-shadow: 0 2px 8px rgba(59,91,219,0.25);
    }

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

    /* Character Stats */
    .text-stats {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 10px;
      font-size: 0.8rem;
      color: var(--color-text-muted);
      font-family: var(--font-mono);
    }

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

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

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

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

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

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

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