/* Utility Container & Header */
    .tool-hero {
      padding: 3rem 0 2rem;
      text-align: center;
      background: radial-gradient(circle at 50% 20%, rgba(197, 160, 89, 0.08) 0%, transparent 70%);
      border-bottom: 1px solid var(--color-border);
    }
    .tool-badge {
      margin-bottom: 1rem;
    }
    .tool-title {
      font-size: 2.75rem;
      margin-bottom: 1rem;
    }
    .tool-subtitle {
      max-width: 800px;
      margin: 0 auto 1.5rem;
      color: var(--color-muted);
      font-size: 1.1rem;
      line-height: 1.6;
    }
    .tool-counter-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.4rem 1rem;
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 600;
      background: rgba(17, 24, 39, 0.9);
      border: 1px solid var(--color-border-interactive);
      color: var(--color-dark);
      transition: var(--transition);
    }
    .tool-counter-badge.valid {
      border-color: var(--color-success);
      color: var(--color-success);
    }
    .tool-counter-badge.max {
      border-color: var(--color-primary);
      color: var(--color-primary-light);
    }

    /* Active Selector Section */
    .selector-section {
      padding: 2.5rem 0;
    }
    .presets-bar {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 0.75rem;
      margin-bottom: 2rem;
      padding: 1.25rem;
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
    }
    .presets-label {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--color-primary-dark);
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-right: 0.5rem;
    }
    .preset-btn {
      padding: 0.4rem 0.85rem;
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 50px;
      background: rgba(255, 255, 255, 0.04);
      color: var(--color-dark-surface);
      border: 1px solid var(--color-border-interactive);
      cursor: pointer;
      transition: var(--transition);
      min-height: 44px;
    }
    .preset-btn:hover {
      background: rgba(197, 160, 89, 0.15);
      border-color: var(--color-primary);
      color: var(--color-dark);
    }
    .preset-btn-reset {
      margin-left: auto;
      background: transparent;
      border-color: rgba(229, 62, 62, 0.4);
      color: var(--color-danger);
    }
    .preset-btn-reset:hover {
      background: var(--color-danger-bg);
      border-color: var(--color-danger);
      color: #FFFFFF;
    }

    /* Actives Selection Grid */
    .actives-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 1.25rem;
    }
    .active-card {
      position: relative;
      background: var(--color-surface);
      border: 1.5px solid var(--color-border-interactive);
      border-radius: var(--radius-md);
      padding: 1.25rem;
      cursor: pointer;
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      user-select: none;
      min-height: 170px;
    }
    .active-card:hover {
      border-color: var(--color-primary);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }
    .active-card:focus-visible {
      outline: 2px solid var(--color-primary);
      outline-offset: 2px;
    }
    .active-card.selected {
      background: rgba(197, 160, 89, 0.08);
      border-color: var(--color-primary);
      box-shadow: 0 0 15px rgba(212, 175, 55, 0.2);
    }
    .active-card.disabled {
      opacity: 0.45;
      cursor: not-allowed;
      border-color: var(--color-border);
      transform: none;
      box-shadow: none;
    }
    .active-card-top {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      margin-bottom: 0.75rem;
    }
    .active-icon {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: rgba(197, 160, 89, 0.12);
      color: var(--color-primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
    }
    .active-check {
      width: 22px;
      height: 22px;
      border-radius: 4px;
      border: 1.5px solid var(--color-border-interactive);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      color: transparent;
      transition: var(--transition);
    }
    .active-card.selected .active-check {
      background: var(--color-primary);
      border-color: var(--color-primary);
      color: var(--color-charcoal);
    }
    .active-name {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--color-dark);
      margin-bottom: 0.35rem;
      line-height: 1.3;
    }
    .active-category {
      font-size: 0.78rem;
      color: var(--color-muted);
      margin-bottom: 0.75rem;
    }
    .active-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 0.4rem;
      font-size: 0.72rem;
    }
    .active-tag {
      padding: 0.2rem 0.5rem;
      border-radius: var(--radius-sm);
      background: rgba(255, 255, 255, 0.05);
      color: var(--color-dark-surface);
      border: 1px solid var(--color-border);
    }
    .active-tag-brand {
      background: rgba(197, 160, 89, 0.15);
      color: var(--color-primary-light);
      border-color: rgba(197, 160, 89, 0.3);
      font-weight: 600;
    }

    /* Diagnostics Dashboard */
    .dashboard-section {
      padding: 2.5rem 0;
      border-top: 1px solid var(--color-border);
    }
    .empty-state-card {
      text-align: center;
      padding: 3.5rem 2rem;
      background: var(--color-surface);
      border: 1px dashed var(--color-border-interactive);
      border-radius: var(--radius-lg);
    }
    .empty-state-icon {
      font-size: 2.5rem;
      color: var(--color-primary-dark);
      margin-bottom: 1rem;
    }
    .empty-state-card h3 {
      font-size: 1.4rem;
      margin-bottom: 0.5rem;
    }
    .empty-state-card p {
      color: var(--color-muted);
      max-width: 500px;
      margin: 0 auto;
    }

    /* Metric Cards Grid */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
      margin-bottom: 2.5rem;
    }
    .metric-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 1.75rem 1.5rem;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .metric-title {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--color-muted);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
    }
    .metric-value {
      font-size: 2.4rem;
      font-weight: 700;
      font-family: var(--font-serif);
      margin-bottom: 0.5rem;
      line-height: 1;
    }
    .metric-desc {
      font-size: 0.85rem;
      color: var(--color-dark-surface);
      line-height: 1.4;
    }
    .metric-bar-wrap {
      width: 100%;
      height: 8px;
      background: rgba(255, 255, 255, 0.08);
      border-radius: 4px;
      margin: 1rem 0 0.5rem;
      overflow: hidden;
    }
    .metric-bar-fill {
      height: 100%;
      border-radius: 4px;
      transition: width 0.4s ease, background-color 0.4s ease;
    }

    /* Pairwise Matrix Collision Table */
    .matrix-card-wrap {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 1.75rem;
      margin-bottom: 2.5rem;
    }
    .matrix-card-header {
      margin-bottom: 1.25rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
    }
    .matrix-card-header h3 {
      font-size: 1.35rem;
    }
    .matrix-legend {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      font-size: 0.78rem;
    }
    .legend-item {
      display: flex;
      align-items: center;
      gap: 0.4rem;
    }
    .legend-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .table-responsive {
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
    }
    .collision-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.88rem;
    }
    .collision-table th,
    .collision-table td {
      padding: 0.85rem 1rem;
      border: 1px solid var(--color-border);
      text-align: left;
    }
    .collision-table th {
      background: rgba(11, 15, 25, 0.8);
      font-weight: 600;
      color: var(--color-dark);
    }
    .collision-table td.self-cell {
      background: rgba(255, 255, 255, 0.02);
      color: var(--color-muted);
      text-align: center;
    }

    /* Layering Schedule Grid */
    .schedule-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
      margin-bottom: 2.5rem;
    }
    .schedule-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 1.75rem;
    }
    .schedule-header {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      margin-bottom: 1.5rem;
      padding-bottom: 0.75rem;
      border-bottom: 1px solid var(--color-border);
    }
    .schedule-header i {
      font-size: 1.4rem;
      color: var(--color-primary);
    }
    .schedule-header h3 {
      font-size: 1.25rem;
      margin: 0;
    }
    .step-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 1rem;
      padding: 0;
      margin: 0;
    }
    .step-item {
      display: flex;
      gap: 1rem;
      align-items: flex-start;
      position: relative;
    }
    .step-num {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: rgba(197, 160, 89, 0.15);
      color: var(--color-primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.85rem;
      flex-shrink: 0;
      margin-top: 2px;
    }
    .step-content h4 {
      font-size: 0.95rem;
      font-family: var(--font-sans);
      color: var(--color-dark);
      margin-bottom: 0.2rem;
    }
    .step-content p {
      font-size: 0.82rem;
      color: var(--color-muted);
      line-height: 1.4;
      margin: 0;
    }
    .step-wait {
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
      margin-top: 0.35rem;
      padding: 0.2rem 0.5rem;
      background: rgba(245, 158, 11, 0.1);
      border: 1px solid rgba(245, 158, 11, 0.25);
      border-radius: var(--radius-sm);
      font-size: 0.75rem;
      color: var(--color-warning);
    }

    /* Alternating Skin Cycling Card */
    .cycling-card {
      background: rgba(17, 24, 39, 0.95);
      border: 1.5px solid var(--color-primary-dark);
      border-radius: var(--radius-lg);
      padding: 1.75rem;
      margin-bottom: 2.5rem;
    }
    .cycling-title {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      color: var(--color-primary-light);
      font-size: 1.25rem;
      margin-bottom: 0.5rem;
    }
    .cycling-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 1rem;
      margin-top: 1.25rem;
    }

    @media (min-width: 480px) and (max-width: 768px) {
      .cycling-grid { grid-template-columns: 1fr; }
    }
    .cycling-day {
      background: rgba(11, 15, 25, 0.7);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 1rem;
    }
    .cycling-day h5 {
      color: var(--color-primary);
      font-size: 0.88rem;
      margin-bottom: 0.35rem;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .cycling-day p {
      font-size: 0.82rem;
      color: var(--color-dark-surface);
      line-height: 1.4;
      margin: 0;
    }

    /* Mechanism Details Accordion */
    .mechanisms-wrap {
      margin-top: 2rem;
    }
    .mechanism-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      overflow: hidden;
    }
    .mechanism-btn {
      width: 100%;
      padding: 1.1rem 1.25rem;
      background: none;
      border: none;
      color: var(--color-dark);
      font-family: var(--font-sans);
      font-size: 0.98rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      text-align: left;
    }
    .mechanism-btn:hover {
      background: rgba(255, 255, 255, 0.02);
    }
    .mechanism-btn i.toggle-icon {
      transition: transform 0.25s ease;
      color: var(--color-muted);
    }
    .mechanism-card.active .mechanism-btn i.toggle-icon {
      transform: rotate(180deg);
      color: var(--color-primary);
    }
    .mechanism-body {
      display: none;
      padding: 0 1.25rem 1.25rem;
      font-size: 0.88rem;
      color: var(--color-muted);
      line-height: 1.6;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }
    .mechanism-card.active .mechanism-body {
      display: block;
    }
    .mechanism-strategy {
      margin-top: 0.85rem;
      padding: 0.75rem 1rem;
      background: rgba(52, 211, 153, 0.06);
      border-left: 3px solid var(--color-success);
      border-radius: var(--radius-sm);
      color: var(--color-dark-surface);
      font-size: 0.84rem;
    }

    /* Status Pill Colors */
    .status-pill {
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
      padding: 0.25rem 0.65rem;
      border-radius: 50px;
      font-size: 0.75rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .status-synergistic {
      background: rgba(52, 211, 153, 0.15);
      color: var(--color-success);
      border: 1px solid rgba(52, 211, 153, 0.3);
    }
    .status-compatible {
      background: rgba(52, 211, 153, 0.1);
      color: var(--color-success);
      border: 1px solid rgba(52, 211, 153, 0.2);
    }
    .status-moderate {
      background: rgba(245, 158, 11, 0.15);
      color: var(--color-warning);
      border: 1px solid rgba(245, 158, 11, 0.3);
    }
    .status-high {
      background: rgba(234, 88, 12, 0.15);
      color: #FB923C;
      border: 1px solid rgba(234, 88, 12, 0.3);
    }
    .status-critical {
      background: var(--color-danger-bg);
      color: var(--color-danger);
      border: 1px solid var(--color-danger-border);
    }

    /* Responsive Queries */
    @media (max-width: 900px) {
      .metrics-grid {
        grid-template-columns: 1fr;
      }
      .schedule-grid {
        grid-template-columns: 1fr;
      }
      .tool-title {
        font-size: 2.15rem;
      }
    }
    @media (max-width: 600px) {
      .actives-grid {
        grid-template-columns: 1fr;
      }
      .presets-bar {
        flex-direction: column;
        align-items: stretch;
      }
      .preset-btn-reset {
        margin-left: 0;
        margin-top: 0.5rem;
      }
    }