/* Source type tabs */
    .source-tabs {
      display: flex;
      gap: 4px;
      background: var(--color-bg);
      border: 1px solid var(--color-border);
      border-radius: 8px;
      padding: 4px;
      margin-bottom: 28px;
      flex-wrap: wrap;
    }
    .source-tab {
      flex: 1;
      min-width: 100px;
      padding: 10px 16px;
      border: none;
      border-radius: 6px;
      background: transparent;
      font-family: var(--font-body);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--color-text-muted);
      cursor: pointer;
      transition: all 150ms ease;
      text-align: center;
    }
    .source-tab.active {
      background: var(--color-surface);
      color: var(--color-primary);
      box-shadow: var(--shadow-sm);
    }
    .source-tab:hover:not(.active) {
      color: var(--color-text);
    }

    /* Form sections */
    .source-form { display: none; }
    .source-form.active { display: block; }

    .form-section {
      margin-bottom: 20px;
    }
    .form-section-label {
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-text-muted);
      margin-bottom: 10px;
    }

    .form-row {
      display: flex;
      gap: 12px;
      margin-bottom: 12px;
      align-items: flex-end;
      flex-wrap: wrap;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 5px;
      flex: 1;
      min-width: 140px;
    }
    .form-group.small {
      flex: 0 0 110px;
      min-width: 80px;
    }
    .form-group.medium {
      flex: 0 0 180px;
      min-width: 140px;
    }
    .form-group label {
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--color-text-secondary);
    }
    .form-group input,
    .form-group select {
      padding: 9px 12px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-body);
      font-size: 0.88rem;
      color: var(--color-text);
      background: var(--color-surface);
      outline: none;
      width: 100%;
    }
    .form-group input:focus,
    .form-group select:focus {
      border-color: var(--color-primary);
      box-shadow: 0 0 0 3px var(--color-primary-light);
    }
    .form-group input::placeholder {
      color: var(--color-text-muted);
    }

    /* Author rows */
    .authors-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .author-row {
      display: flex;
      gap: 10px;
      align-items: flex-end;
    }
    .author-row .form-group { min-width: 100px; }
    .author-remove {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 38px;
      border: none;
      border-radius: var(--radius-sm);
      background: transparent;
      color: var(--color-text-muted);
      cursor: pointer;
      transition: all 150ms ease;
      flex-shrink: 0;
    }
    .author-remove:hover { background: #fef2f2; color: #ef4444; }

    .add-author-btn {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 7px 14px;
      border: 1px dashed var(--color-border);
      border-radius: var(--radius-sm);
      background: transparent;
      font-family: var(--font-body);
      font-size: 0.82rem;
      font-weight: 600;
      color: var(--color-primary);
      cursor: pointer;
      transition: all 150ms ease;
      margin-top: 4px;
    }
    .add-author-btn:hover {
      background: var(--color-primary-light);
      border-color: var(--color-primary-subtle);
    }

    /* Citation preview */
    .citation-preview-section {
      margin-top: 28px;
      padding-top: 24px;
      border-top: 2px solid var(--color-border);
    }
    .citation-preview-label {
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-text-muted);
      margin-bottom: 12px;
    }
    .citation-preview-box {
      padding: 20px 24px;
      background: var(--color-bg);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      font-size: 0.92rem;
      line-height: 1.75;
      color: var(--color-text);
      min-height: 60px;
      text-indent: -36px;
      padding-left: 60px;
    }
    .citation-preview-box .cite-empty {
      color: var(--color-text-muted);
      font-style: italic;
      text-indent: 0;
    }

    .preview-actions {
      display: flex;
      gap: 10px;
      margin-top: 14px;
      flex-wrap: wrap;
    }

    /* Citation list */
    .citation-list-section {
      margin-top: 32px;
      padding-top: 24px;
      border-top: 2px solid var(--color-border);
    }
    .citation-list-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 16px;
      flex-wrap: wrap;
      gap: 10px;
    }
    .citation-list-title {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--color-text);
    }
    .citation-list-count {
      font-size: 0.82rem;
      color: var(--color-text-muted);
      font-weight: 500;
    }
    .citation-list {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .citation-list-empty {
      padding: 28px 20px;
      text-align: center;
      color: var(--color-text-muted);
      font-size: 0.88rem;
      border: 1px dashed var(--color-border);
      border-radius: var(--radius-md);
    }
    .citation-item {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      padding: 14px 18px;
      background: var(--color-bg);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
    }
    .citation-item-text {
      flex: 1;
      font-size: 0.88rem;
      line-height: 1.7;
      color: var(--color-text);
      text-indent: -36px;
      padding-left: 36px;
    }
    .citation-item-remove {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      border: none;
      border-radius: var(--radius-sm);
      background: transparent;
      color: var(--color-text-muted);
      cursor: pointer;
      transition: all 150ms ease;
      flex-shrink: 0;
      margin-top: 2px;
    }
    .citation-item-remove:hover { background: #fef2f2; color: #ef4444; }

    /* Toast */
    .toast-msg {
      position: fixed;
      bottom: 24px;
      right: 24px;
      padding: 12px 20px;
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      font-weight: 600;
      color: white;
      background: var(--color-text);
      box-shadow: var(--shadow-lg);
      z-index: 999;
      opacity: 0;
      transform: translateY(12px);
      transition: all 250ms ease;
      pointer-events: none;
    }
    .toast-msg.show { opacity: 1; transform: translateY(0); }

    /* Month select styling */
    .form-group select {
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .source-tabs { flex-direction: column; }
      .source-tab { min-width: auto; }
      .form-row { flex-direction: column; gap: 10px; }
      .form-group.small,
      .form-group.medium { flex: 1; min-width: auto; }
      .author-row { flex-wrap: wrap; }
      .citation-preview-box { padding-left: 40px; text-indent: -20px; }
      .citation-item-text { text-indent: -20px; padding-left: 20px; }
    }
    @media (max-width: 480px) {
      .preview-actions { flex-direction: column; }
      .preview-actions .btn { width: 100%; }
    }