/* ============== CATEGORY INDEX HEADER ============== */
    .category-index-header {
        background: var(--paper-card);
        border: 1px solid var(--line);
        border-radius: var(--radius);
        padding: 2rem 1.5rem;
        margin-bottom: 2rem;
        position: relative;
        overflow: hidden;
    }

    .category-index-header::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, var(--sea), var(--gold), var(--brick));
    }

    .category-index-header-content {
        position: relative;
        z-index: 1;
    }

    .category-index-title {
        font-family: var(--font-display);
        font-weight: 700;
        font-size: 2rem;
        color: var(--ink);
        margin: 0 0 0.5rem 0;
        display: flex;
        align-items: center;
        gap: 0.75rem;
    }

    .title-icon {
        display: inline-flex;
        color: var(--sea);
        font-size: 1.8rem;
    }

    .category-index-description {
        font-size: 1rem;
        color: var(--ink-soft);
        max-width: 60ch;
        margin: 0 0 1rem 0;
        line-height: 1.6;
    }

    .category-index-stats {
        display: flex;
        flex-wrap: wrap;
        gap: 1rem 1.5rem;
    }

    .category-index-stats .stat-badge {
        display: inline-flex;
        align-items: center;
        gap: 0.4rem;
        font-family: var(--font-label);
        font-size: 0.82rem;
        color: var(--ink-soft);
        background: var(--paper);
        padding: 0.3rem 0.85rem;
        border-radius: 20px;
        border: 1px solid var(--line);
    }

    .category-index-stats .stat-badge i {
        color: var(--sea);
        font-size: 0.9rem;
    }

    /* ============== CATEGORY SEARCH BAR ============== */
    .category-search-bar {
        margin-bottom: 2rem;
    }

    .search-category-wrapper {
        position: relative;
        max-width: 480px;
    }

    .search-category-icon {
        position: absolute;
        left: 1rem;
        top: 50%;
        transform: translateY(-50%);
        color: var(--ink-soft);
        font-size: 1.1rem;
    }

    .search-category-input {
        padding: 0.6rem 2.8rem 0.6rem 2.8rem;
        border: 2px solid var(--line);
        border-radius: 50px;
        font-size: 0.95rem;
        background: var(--paper-card);
        transition: all 0.2s;
        width: 100%;
    }

    .search-category-input:focus {
        border-color: var(--sea);
        box-shadow: 0 0 0 4px rgba(21, 122, 135, 0.12);
        outline: none;
    }

    .search-category-input::placeholder {
        color: var(--ink-soft);
        opacity: 0.7;
    }

    .btn-clear-search-category {
        position: absolute;
        right: 1rem;
        top: 50%;
        transform: translateY(-50%);
        background: none;
        border: none;
        color: var(--ink-soft);
        font-size: 1.1rem;
        padding: 0;
        cursor: pointer;
        display: none;
    }

    .btn-clear-search-category:hover {
        color: var(--brick);
    }

    .search-result-category {
        margin-top: 0.5rem;
        font-size: 0.88rem;
        color: var(--ink-soft);
        display: none;
        padding: 0.35rem 0.85rem;
        background: var(--gold-tint, #FFF8E7);
        border-radius: 20px;
        display: inline-flex;
        align-items: center;
        gap: 0.25rem;
    }

    .search-result-category.show {
        display: inline-flex;
    }

    .search-result-category strong {
        color: var(--ink);
    }

    /* ============== EMPTY STATE ============== */
    .empty-state-category {
        text-align: center;
        padding: 4rem 1.5rem;
        background: var(--paper-card);
        border: 1px solid var(--line);
        border-radius: var(--radius);
        margin: 1.5rem 0;
        grid-column: 1 / -1;
    }

    .empty-state-category .empty-state-icon {
        font-size: 4rem;
        color: var(--line);
        margin-bottom: 1rem;
    }

    .empty-state-category .empty-state-icon i {
        display: block;
    }

    .empty-state-category .empty-state-title {
        font-family: var(--font-display);
        font-weight: 700;
        font-size: 1.5rem;
        color: var(--ink);
        margin-bottom: 0.5rem;
    }

    .empty-state-category .empty-state-text {
        color: var(--ink-soft);
        font-size: 1rem;
        max-width: 40ch;
        margin: 0 auto 1.5rem;
        line-height: 1.6;
    }

    /* ============== CATEGORY GRID ============== */
    .category-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
        gap: 1.25rem;
        margin-bottom: 2.5rem;
    }

    .category-card {
        display: flex;
        align-items: stretch;
        gap: 1rem;
        padding: 1.25rem;
        background: var(--paper-card);
        border: 1px solid var(--line);
        border-radius: var(--radius);
        text-decoration: none;
        color: var(--ink);
        transition: all 0.25s ease;
        position: relative;
        overflow: hidden;
    }

    .category-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 4px;
        height: 100%;
        background: var(--cat-color, var(--sea));
        transition: width 0.3s ease;
    }

    .category-card:hover {
        transform: translateY(-4px);
        box-shadow: 0 8px 24px rgba(16, 51, 60, 0.1);
        border-color: var(--cat-color, var(--sea));
    }

    .category-card:hover::before {
        width: 6px;
    }

    .category-card-icon {
        flex: none;
        width: 48px;
        height: 48px;
        border-radius: 12px;
        background: var(--cat-color, var(--sea));
        color: #fff;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.3rem;
        transition: transform 0.3s ease;
    }

    .category-card:hover .category-card-icon {
        transform: scale(1.05) rotate(-2deg);
    }

    .category-card-content {
        flex: 1;
        min-width: 0;
    }

    .category-card-title {
        font-family: var(--font-display);
        font-weight: 700;
        font-size: 1.05rem;
        color: var(--ink);
        margin: 0 0 0.25rem 0;
        transition: color 0.2s;
    }

    .category-card:hover .category-card-title {
        color: var(--cat-color, var(--sea));
    }

    .category-card-desc {
        font-size: 0.85rem;
        color: var(--ink-soft);
        margin: 0 0 0.5rem 0;
        line-height: 1.4;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .category-card-footer {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding-top: 0.5rem;
        border-top: 1px solid var(--line);
    }

    .category-card-count {
        font-family: var(--font-label);
        font-size: 0.72rem;
        font-weight: 600;
        color: var(--ink-soft);
        display: flex;
        align-items: center;
        gap: 0.3rem;
    }

    .category-card-count i {
        font-size: 0.7rem;
    }

    .category-card-arrow {
        color: var(--line);
        font-size: 1.1rem;
        transition: all 0.3s ease;
    }

    .category-card:hover .category-card-arrow {
        color: var(--cat-color, var(--sea));
        transform: translateX(4px);
    }

    /* ============== POPULAR CATEGORIES ============== */
    .popular-categories-section {
        background: var(--paper-card);
        border: 1px solid var(--line);
        border-radius: var(--radius);
        padding: 1.5rem;
        margin: 2rem 0 2.5rem;
    }

    .popular-categories-list {
        margin-top: 1rem;
    }

    .popular-category-item {
        display: flex;
        align-items: center;
        gap: 1rem;
        padding: 0.7rem 0;
        border-bottom: 1px solid var(--line);
        position: relative;
    }

    .popular-category-item:last-child {
        border-bottom: none;
    }

    .popular-rank {
        flex: none;
        width: 30px;
        font-family: var(--font-display);
        font-weight: 700;
        font-size: 1.2rem;
        color: var(--gold);
        text-align: center;
    }

    .popular-category-info {
        flex: 1;
        min-width: 0;
    }

    .popular-category-name {
        font-weight: 600;
        font-size: 0.95rem;
        color: var(--ink);
        display: block;
    }

    .popular-category-count {
        font-size: 0.78rem;
        color: var(--ink-soft);
    }

    .popular-category-bar {
        position: absolute;
        bottom: 0;
        left: 0;
        height: 2px;
        background: linear-gradient(90deg, var(--gold), var(--sea));
        border-radius: 2px;
        transition: width 0.6s ease;
    }

    /* ============== LOADING ============== */
    .spinner-border.text-sea {
        color: var(--sea, #157A87);
    }

    .category-grid.loading {
        opacity: 0.5;
    }

    /* ============== RESPONSIVE ============== */
    @media (max-width: 768px) {
        .category-index-header {
            padding: 1.25rem;
        }

        .category-index-title {
            font-size: 1.5rem;
            gap: 0.5rem;
        }

        .title-icon {
            font-size: 1.3rem;
        }

        .category-index-description {
            font-size: 0.9rem;
        }

        .category-index-stats {
            gap: 0.5rem;
        }

        .category-index-stats .stat-badge {
            font-size: 0.75rem;
            padding: 0.2rem 0.65rem;
        }

        .category-grid {
            grid-template-columns: 1fr;
            gap: 1rem;
        }

        .category-card {
            padding: 1rem;
        }

        .category-card-icon {
            width: 40px;
            height: 40px;
            font-size: 1.1rem;
        }

        .category-card-title {
            font-size: 0.95rem;
        }

        .category-card-desc {
            font-size: 0.8rem;
            -webkit-line-clamp: 2;
        }

        .search-category-wrapper {
            max-width: 100%;
        }

        .popular-categories-section {
            padding: 1rem;
        }

        .popular-category-item {
            padding: 0.5rem 0;
            gap: 0.75rem;
        }

        .popular-rank {
            width: 24px;
            font-size: 1rem;
        }

        .popular-category-name {
            font-size: 0.85rem;
        }

        .popular-category-count {
            font-size: 0.7rem;
        }
    }

    @media (min-width: 769px) and (max-width: 992px) {
        .category-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }

    @media (min-width: 993px) {
        .category-grid {
            grid-template-columns: repeat(3, 1fr);
        }
    }

    /* ============== ANIMATIONS ============== */
    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(20px);
        }

        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .category-card {
        animation: fadeInUp 0.4s ease both;
    }

    .category-card:nth-child(1) {
        animation-delay: 0.05s;
    }

    .category-card:nth-child(2) {
        animation-delay: 0.10s;
    }

    .category-card:nth-child(3) {
        animation-delay: 0.15s;
    }

    .category-card:nth-child(4) {
        animation-delay: 0.20s;
    }

    .category-card:nth-child(5) {
        animation-delay: 0.25s;
    }

    .category-card:nth-child(6) {
        animation-delay: 0.30s;
    }

    .category-card:nth-child(7) {
        animation-delay: 0.35s;
    }

    .category-card:nth-child(8) {
        animation-delay: 0.40s;
    }

    .category-card:nth-child(9) {
        animation-delay: 0.45s;
    }

    .category-card:nth-child(10) {
        animation-delay: 0.50s;
    }

    .category-card:nth-child(11) {
        animation-delay: 0.55s;
    }