* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      background-color: var(--bg);
      color: var(--text);
      font-family: var(--font-sans);
      font-size: 15px;
      line-height: 1.6;
      transition: background-color 0.25s ease, color 0.25s ease;
      padding: 32px 24px 80px 24px;
    }

    /* Page container */
    .page-wrap {
      max-width: 1400px;
      margin: 0 auto;
    }

    /* Header Presentation Spec */
    .spec-header {
      border-bottom: 1px solid var(--border);
      padding-bottom: 24px;
      margin-bottom: 40px;
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      flex-wrap: wrap;
      gap: 16px;
    }

    .spec-tag {
      font-size: 11px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 6px;
    }

    .spec-title {
      font-family: var(--font-serif);
      font-size: clamp(28px, 3.5vw, 38px);
      line-height: 1.15;
      font-weight: 500;
      color: var(--text);
      margin-bottom: 10px;
    }

    .spec-desc {
      color: var(--text-muted);
      font-size: 14px;
      max-width: 820px;
      line-height: 1.55;
    }

    .theme-switch-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-control);
      padding: 8px 16px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text);
      cursor: pointer;
      min-height: 44px;
      box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    }

    .section-label {
      font-family: var(--font-sans);
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.07em;
      text-transform: uppercase;
      color: var(--text-soft);
      margin-bottom: 8px;
    }

    .section-heading {
      font-family: var(--font-serif);
      font-size: 24px;
      font-weight: 500;
      margin-bottom: 8px;
      color: var(--text);
    }

    .section-sub {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
      max-width: 900px;
    }

    /* Comparison Container */
    .showcase-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 40px;
      margin-bottom: 56px;
    }

    @media (min-width: 1200px) {
      .showcase-grid-split {
        display: grid;
        grid-template-columns: 410px 1fr;
        gap: 40px;
        align-items: start;
      }
    }

    /* Device Mockup Shell */
    .device-shell {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 28px;
      box-shadow: 0 16px 36px rgba(0,0,0,0.07);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .device-mobile {
      width: 100%;
      max-width: 390px;
      margin: 0 auto;
      border-radius: 36px;
    }

    .device-desktop {
      width: 100%;
      border-radius: 16px;
    }

    /* Mobile Chrome Header */
    .mobile-status-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 10px 20px 4px 20px;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-muted);
    }

    .mobile-top-bar {
      padding: 10px 16px 14px 16px;
      border-bottom: 1px solid var(--border-subtle);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .brand-mark {
      width: 28px;
      height: 28px;
      background: var(--brand-indigo);
      color: #FFF;
      font-family: var(--font-serif);
      font-weight: 600;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
    }

    .brand-name {
      font-size: 14px;
      font-weight: 700;
      line-height: 1.1;
      letter-spacing: -0.01em;
    }

    .brand-sub {
      font-size: 10px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--text-muted);
    }

    .mobile-nav-tools {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .pill-group {
      display: inline-flex;
      border: 1px solid var(--border);
      border-radius: var(--radius-control);
      padding: 2px;
      background: var(--surface-raised);
    }

    .pill-item {
      padding: 4px 8px;
      font-size: 11px;
      font-weight: 600;
      border-radius: 4px;
      color: var(--text-muted);
      cursor: pointer;
      text-decoration: none;
    }

    .pill-item.active {
      background: var(--surface);
      color: var(--text);
      box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    }

    /* Mobile Screen Content */
    .mobile-content {
      padding: 16px;
      display: flex;
      flex-direction: column;
      gap: 16px;
      background: var(--bg);
      min-height: 640px;
    }

    .screen-header-block {
      margin-bottom: 4px;
    }

    .screen-header-block h1 {
      font-family: var(--font-serif);
      font-size: 24px;
      font-weight: 500;
      line-height: 1.2;
      color: var(--text);
    }

    .screen-header-block p {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 4px;
      line-height: 1.45;
    }

    /* Filters Bar (Exactly 2 controls: Search + Verified Toggle) */
    .filters-bar {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .search-input-wrap {
      position: relative;
      width: 100%;
    }

    .search-icon {
      position: absolute;
      left: 12px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-soft);
      pointer-events: none;
      width: 16px;
      height: 16px;
    }

    .search-input {
      width: 100%;
      height: 44px;
      padding: 10px 14px 10px 38px;
      border: 1px solid var(--border);
      border-radius: var(--radius-control);
      background: var(--surface);
      color: var(--text);
      font-family: var(--font-sans);
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .search-input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px var(--focus-ring);
    }

    .search-input::placeholder {
      color: var(--text-soft);
    }

    /* Filter 2: Filter by verified key */
    .filter-tabs-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: var(--surface-raised);
      border: 1px solid var(--border);
      border-radius: var(--radius-control);
      padding: 3px;
    }

    .filter-tab-btn {
      flex: 1;
      height: 38px;
      min-height: 38px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      border: none;
      background: transparent;
      color: var(--text-muted);
      cursor: pointer;
      transition: all 0.15s ease;
    }

    .filter-tab-btn.active {
      background: var(--surface);
      color: var(--text);
      box-shadow: 0 1px 3px rgba(0,0,0,0.06);
    }

    .filter-tab-btn .badge-count {
      font-size: 11px;
      padding: 1px 6px;
      border-radius: 10px;
      background: var(--border-subtle);
      color: var(--text-muted);
    }

    .filter-tab-btn.active .badge-count {
      background: var(--accent-soft);
      color: var(--accent);
    }

    /* Cards List */
    .cards-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    /* Card Component */
    .discipline-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 16px;
      display: flex;
      flex-direction: column;
      gap: 14px;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      position: relative;
    }

    .discipline-card:hover {
      border-color: var(--accent);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }

    .card-top {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 12px;
    }

    .card-title-group {
      flex: 1;
    }

    .card-title {
      font-family: var(--font-serif);
      font-size: 18px;
      font-weight: 600;
      color: var(--text);
      line-height: 1.3;
    }

    .card-mode-tag {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      font-size: 11px;
      font-weight: 600;
      padding: 3px 8px;
      border-radius: 6px;
      margin-top: 4px;
    }

    .tag-verified {
      background: var(--success-bg);
      color: var(--success);
      border: 1px solid rgba(34, 134, 81, 0.2);
    }

    .tag-study-only {
      background: var(--surface-raised);
      color: var(--text-muted);
      border: 1px solid var(--border);
    }

    /* Two numbers distinct comparison */
    .card-metrics {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      background: var(--surface-raised);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-control);
      padding: 10px 12px;
    }

    .metric-col {
      display: flex;
      flex-direction: column;
    }

    .metric-col:first-child {
      border-right: 1px solid var(--border);
      padding-right: 10px;
    }

    .metric-label {
      font-size: 11px;
      font-weight: 500;
      color: var(--text-muted);
      margin-bottom: 2px;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .metric-val-total {
      font-family: var(--font-sans);
      font-size: 18px;
      font-weight: 700;
      color: var(--text);
      letter-spacing: -0.02em;
    }

    .metric-val-verified {
      font-family: var(--font-sans);
      font-size: 18px;
      font-weight: 700;
      color: var(--success);
      letter-spacing: -0.02em;
    }

    .metric-val-zero {
      font-family: var(--font-sans);
      font-size: 18px;
      font-weight: 600;
      color: var(--text-soft);
    }

    .metric-desc-sub {
      font-size: 10px;
      color: var(--text-soft);
      margin-top: 1px;
    }

    /* Action bar of card */
    .card-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn-card-start {
      flex: 1;
      min-height: 44px;
      border: none;
      border-radius: var(--radius-control);
      font-family: var(--font-sans);
      font-size: 13px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      cursor: pointer;
      text-decoration: none;
      transition: all 0.15s ease;
    }

    .btn-primary {
      background: var(--accent);
      color: var(--accent-contrast);
    }

    .btn-primary:hover {
      opacity: 0.93;
    }

    .btn-secondary {
      background: var(--surface-raised);
      border: 1px solid var(--border);
      color: var(--text);
    }

    .btn-secondary:hover {
      background: var(--border-subtle);
    }

    .btn-quiet {
      min-height: 44px;
      padding: 0 12px;
      background: transparent;
      border: 1px solid transparent;
      border-radius: var(--radius-control);
      color: var(--text-muted);
      font-size: 12px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }

    .btn-quiet:hover {
      background: var(--surface-raised);
      color: var(--text);
    }

    /* Bottom Tab Bar (Fixed mobile) */
    .mobile-tab-bar {
      border-top: 1px solid var(--border);
      background: var(--surface);
      display: flex;
      justify-content: space-around;
      align-items: center;
      padding: 6px 4px 10px 4px;
    }

    .tab-target {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-width: 48px;
      min-height: 48px;
      text-decoration: none;
      color: var(--text-muted);
      gap: 2px;
    }

    .tab-target.active {
      color: var(--accent);
    }

    .tab-label {
      font-size: 10px;
      font-weight: 600;
    }

    .tab-icon {
      width: 20px;
      height: 20px;
      stroke-width: 2;
    }

    /* Desktop Spec Layout */
    .desktop-wrapper {
      display: flex;
      min-height: 780px;
      background: var(--bg);
    }

    .desktop-sidebar {
      width: 240px;
      background: var(--surface);
      border-right: 1px solid var(--border);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 24px 16px;
      flex-shrink: 0;
    }

    .sidebar-top {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .sidebar-nav {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .sidebar-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 10px 14px;
      border-radius: var(--radius-control);
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      text-decoration: none;
      min-height: 44px;
      transition: all 0.15s ease;
    }

    .sidebar-item:hover {
      background: var(--surface-raised);
      color: var(--text);
    }

    .sidebar-item.active {
      background: var(--accent-soft);
      color: var(--accent);
      font-weight: 700;
    }

    .sidebar-footer {
      display: flex;
      flex-direction: column;
      gap: 14px;
      border-top: 1px solid var(--border-subtle);
      padding-top: 18px;
    }

    .desktop-main {
      flex: 1;
      padding: 32px 40px;
      max-width: 1120px;
      margin: 0 auto;
    }

    .desktop-page-head {
      margin-bottom: 28px;
      display: flex;
      justify-content: space-between;
      align-items: flex-end;
      border-bottom: 1px solid var(--border-subtle);
      padding-bottom: 20px;
    }

    .desktop-page-head h1 {
      font-family: var(--font-serif);
      font-size: 32px;
      font-weight: 500;
      color: var(--text);
      line-height: 1.2;
    }

    .desktop-page-head p {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 6px;
      max-width: 620px;
    }

    /* 2-Column Equal Height Cards Grid for Wide Screen */
    .desktop-cards-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .desktop-cards-grid .discipline-card {
      justify-content: space-between;
    }

    /* Specialized State Views */
    .state-section {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 24px;
      margin-bottom: 32px;
    }

    .state-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 16px;
      padding-bottom: 12px;
      border-bottom: 1px solid var(--border-subtle);
    }

    .state-badge {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      padding: 3px 8px;
      border-radius: 4px;
      background: var(--surface-raised);
      color: var(--text-muted);
      border: 1px solid var(--border);
    }

    /* Empty Search State */
    .empty-search-box {
      text-align: center;
      padding: 40px 20px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 10px;
      background: var(--surface-raised);
      border: 1px dashed var(--border);
      border-radius: var(--radius-card);
    }

    .empty-search-box svg {
      color: var(--text-soft);
      width: 40px;
      height: 40px;
    }

    .empty-search-title {
      font-family: var(--font-serif);
      font-size: 18px;
      font-weight: 600;
      color: var(--text);
    }

    .empty-search-text {
      font-size: 13px;
      color: var(--text-muted);
      max-width: 360px;
      line-height: 1.45;
    }

    /* Offline Banner / State */
    .offline-notice-bar {
      background: var(--surface-raised);
      border: 1px solid var(--border);
      border-left: 4px solid var(--warning);
      border-radius: var(--radius-control);
      padding: 10px 14px;
      font-size: 12px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      color: var(--text);
      margin-bottom: 12px;
    }

    /* Error State */
    .error-card-state {
      background: var(--danger-bg);
      border: 1px solid var(--danger);
      border-radius: var(--radius-card);
      padding: 24px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      gap: 12px;
    }

    .error-card-state h3 {
      font-family: var(--font-serif);
      font-size: 18px;
      color: var(--text);
    }

    .error-card-state p {
      font-size: 13px;
      color: var(--text-muted);
      max-width: 420px;
    }

    /* Skeletons */
    .skeleton {
      background: linear-gradient(90deg, var(--surface-raised) 25%, var(--border-subtle) 50%, var(--surface-raised) 75%);
      background-size: 200% 100%;
      animation: shimmer 1.8s infinite;
      border-radius: 4px;
    }

    @keyframes shimmer {
      0% { background-position: 200% 0; }
      100% { background-position: -200% 0; }
    }

    @media (prefers-reduced-motion: reduce) {
      .skeleton {
        animation: none;
        background: var(--surface-raised);
      }
    }

    .skeleton-text {
      height: 14px;
      width: 60%;
      margin-bottom: 8px;
    }

    .skeleton-metric {
      height: 48px;
      width: 100%;
      border-radius: var(--radius-control);
    }

    .skeleton-btn {
      height: 44px;
      width: 100%;
      border-radius: var(--radius-control);
    }

    /* Audit & Rationale Card */
    .audit-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 24px;
      margin-top: 40px;
    }

    .audit-col h4 {
      font-size: 13px;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .audit-col p {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }