/* Mode Toggle */
    .mode-toggle {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 24px;
      flex-wrap: wrap;
    }

    .mode-toggle-label {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--color-text-secondary);
    }

    .mode-btns {
      display: flex;
      gap: 4px;
      background: var(--color-bg);
      border: 1px solid var(--color-border);
      border-radius: 6px;
      padding: 3px;
    }

    .mode-btn {
      padding: 7px 16px;
      border: none;
      border-radius: 4px;
      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;
    }

    .mode-btn.active {
      background: var(--color-surface);
      color: var(--color-primary);
      box-shadow: var(--shadow-sm);
    }

    .mode-btn:hover:not(.active) {
      color: var(--color-text);
    }

    /* Simple Mode */
    .simple-inputs {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 24px;
    }

    .input-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
      flex: 1;
      min-width: 180px;
    }

    .input-group label {
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-text-muted);
    }

    .input-group input {
      padding: 10px 14px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-mono);
      font-size: 0.95rem;
      color: var(--color-text);
      background: var(--color-surface);
      outline: none;
    }

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

    /* Weighted Mode Table */
    .categories-wrapper {
      overflow-x: auto;
      margin-bottom: 20px;
    }

    .categories-table {
      width: 100%;
      border-collapse: collapse;
    }

    .categories-table th {
      padding: 10px 12px;
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-text-muted);
      text-align: left;
      border-bottom: 2px solid var(--color-border);
      white-space: nowrap;
    }

    .categories-table th:last-child {
      width: 48px;
      text-align: center;
    }

    .categories-table td {
      padding: 8px 6px;
      vertical-align: middle;
    }

    .categories-table td:first-child {
      padding-left: 12px;
    }

    .categories-table tr {
      border-bottom: 1px solid var(--color-border-light);
    }

    .categories-table tr:hover {
      background: var(--color-bg);
    }

    .cat-name {
      width: 100%;
      min-width: 140px;
      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;
    }

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

    .cat-name::placeholder {
      color: var(--color-text-muted);
    }

    .cat-num {
      width: 90px;
      padding: 9px 12px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-mono);
      font-size: 0.88rem;
      color: var(--color-text);
      background: var(--color-surface);
      outline: none;
      text-align: center;
    }

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

    .cat-remove {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 34px;
      height: 34px;
      border: none;
      border-radius: var(--radius-sm);
      background: transparent;
      color: var(--color-text-muted);
      cursor: pointer;
      transition: all 150ms ease;
      margin: 0 auto;
    }

    .cat-remove:hover {
      background: #fef2f2;
      color: #ef4444;
    }

    /* Weight Warning */
    .weight-status {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 10px 16px;
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .weight-status.ok {
      background: #ecfdf5;
      color: #059669;
      border: 1px solid #a7f3d0;
    }

    .weight-status.warn {
      background: #fef2f2;
      color: #ef4444;
      border: 1px solid #fecaca;
    }

    .weight-status.neutral {
      background: var(--color-bg);
      color: var(--color-text-muted);
      border: 1px solid var(--color-border);
    }

    /* Action Row */
    .action-row {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
      margin-bottom: 28px;
    }

    /* Results Grid */
    .results-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 16px;
      margin-bottom: 8px;
    }

    .res-card {
      padding: 20px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--color-border);
      background: var(--color-surface);
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .res-card.primary {
      background: var(--color-primary-light);
      border-color: var(--color-primary-subtle);
    }

    .res-label {
      font-size: 0.72rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-text-muted);
    }

    .res-card.primary .res-label {
      color: var(--color-primary);
    }

    .res-value {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--color-text);
      line-height: 1.1;
    }

    .res-card.primary .res-value {
      color: var(--color-primary);
      font-size: 2.4rem;
    }

    .res-sub {
      font-size: 0.8rem;
      color: var(--color-text-muted);
    }

    /* Grading Scale Reference */
    .grade-scale-section {
      margin-top: 24px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    .grade-scale-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 20px;
      background: var(--color-bg);
      cursor: pointer;
      user-select: none;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--color-text-secondary);
      transition: background 150ms ease;
    }

    .grade-scale-header:hover {
      background: var(--color-border-light);
    }

    .grade-scale-header svg {
      transition: transform 200ms ease;
    }

    .grade-scale-header.open svg {
      transform: rotate(180deg);
    }

    .grade-scale-body {
      display: none;
      padding: 16px 20px;
    }

    .grade-scale-body.open {
      display: block;
    }

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

    .grade-scale-table th {
      padding: 8px 12px;
      font-size: 0.72rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-text-muted);
      text-align: left;
      border-bottom: 2px solid var(--color-border);
    }

    .grade-scale-table td {
      padding: 6px 12px;
      border-bottom: 1px solid var(--color-border-light);
      color: var(--color-text);
    }

    .grade-scale-table td:first-child {
      font-weight: 600;
      font-family: var(--font-mono);
    }

    .grade-scale-table td:last-child {
      font-family: var(--font-mono);
    }

    .grade-scale-table tr:last-child td {
      border-bottom: none;
    }

    /* Responsive */
    @media (max-width: 768px) {
      .results-grid {
        grid-template-columns: 1fr;
      }

      .res-card.primary .res-value {
        font-size: 2rem;
      }

      .cat-name {
        min-width: 100px;
      }

      .cat-num {
        width: 75px;
      }
    }

    @media (max-width: 480px) {
      .simple-inputs {
        flex-direction: column;
      }

      .action-row {
        flex-direction: column;
      }

      .action-row .btn {
        width: 100%;
      }
    }