/* ================================================
   BOOKS PAGE STYLES - Target Publications
   Redesigned with Horizontal Filter Bar & Grouped Display
   All classes prefixed with 'bk-' to avoid conflicts
   ================================================ */

:root {
    --bk-primary: #f59e0b;
    --bk-primary-dark: #d97706;
    --bk-primary-light: #fef3c7;
    --bk-secondary: #3b82f6;
    --bk-success: #10b981;
    --bk-danger: #ef4444;
    --bk-gray-50: #f9fafb;
    --bk-gray-100: #f3f4f6;
    --bk-gray-200: #e5e7eb;
    --bk-gray-300: #d1d5db;
    --bk-gray-400: #9ca3af;
    --bk-gray-600: #4b5563;
    --bk-gray-800: #1f2937;
    --bk-gray-900: #111827;
    --bk-filter-height: 72px;
}

/* ================================================
   PAGE CONTAINER
   ================================================ */

.bk-page-wrapper {
    min-height: 100vh;
    background: linear-gradient(to bottom, #ffffff 0%, #fafafa 100%);
}

.bk-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 0.5rem;
}

.bk-container--narrow {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

@media (min-width: 768px) {
    .bk-container { padding: 0 1rem; }
    .bk-container--narrow { padding: 0 1rem; }
}

/* ================================================
   PAGE HEADER
   ================================================ */

.bk-page-header {
    padding: 2.5rem 0 1.5rem;
    background: linear-gradient(135deg, var(--bk-primary) 0%, #fbbf24 100%);
    margin-bottom: 2rem;
    border-radius: 0 0 2rem 2rem;
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.15);
}

.bk-page-header__content {
    text-align: center;
    color: white;
}

.bk-page-header__title {
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 0.5rem;
    letter-spacing: -0.025em;
}

.bk-page-header__subtitle {
    font-size: 1rem;
    opacity: 0.95;
    margin: 0;
}

@media (min-width: 640px) {
    .bk-page-header__title { font-size: 2.5rem; }
    .bk-page-header__subtitle { font-size: 1.125rem; }
}

/* ================================================
   HORIZONTAL FILTER BAR (NEW)
   ================================================ */

.bk-filter-bar {
    background: white;
    border-radius: 1rem;
    padding: 0.75rem 1rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--bk-gray-100);
    transition: all 0.3s ease;
}

.bk-filter-bar--sticky {
    position: sticky;
    top: 0;
    z-index: 100;
    border-radius: 0 0 1rem 1rem;
    margin-top: -1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
    animation: bk-slide-down 0.3s ease;
}

@keyframes bk-slide-down {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.bk-filter-bar__form {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Search Bar */
.bk-filter-bar__search {
    position: relative;
    flex: 1;
    min-width: 200px;
    max-width: 300px;
}

.bk-filter-bar__search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--bk-gray-400);
    pointer-events: none;
}

.bk-filter-bar__search-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.75rem;
    border: 1px solid var(--bk-gray-200);
    border-radius: 0.75rem;
    font-size: 0.9375rem;
    transition: all 0.2s ease;
    background: var(--bk-gray-50);
}

.bk-filter-bar__search-input:focus {
    outline: none;
    border-color: var(--bk-primary);
    background: white;
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

.bk-filter-bar__clear {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1.75rem;
    height: 1.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bk-gray-200);
    border: none;
    border-radius: 0.5rem;
    color: var(--bk-gray-600);
    cursor: pointer;
    transition: all 0.2s ease;
}

.bk-filter-bar__clear:hover {
    background: var(--bk-gray-300);
}

/* Dropdowns */
.bk-filter-bar__dropdown {
    position: relative;
}

.bk-filter-bar__select {
    padding: 0.75rem 2rem 0.75rem 1rem;
    border: 1px solid var(--bk-gray-200);
    border-radius: 0.75rem;
    font-size: 0.875rem;
    background: var(--bk-gray-50);
    cursor: pointer;
    transition: all 0.2s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
    min-width: 140px;
}

.bk-filter-bar__select:focus {
    outline: none;
    border-color: var(--bk-primary);
    background-color: white;
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

.bk-filter-bar__sort {
    display: none;
}

@media (min-width: 1024px) {
    .bk-filter-bar__sort {
        display: block;
    }
}

/* Featured Toggle */
.bk-filter-bar__toggle {
    display: flex;
    align-items: center;
}

.bk-filter-bar__toggle input[type="checkbox"] {
    display: none;
}

.bk-filter-bar__toggle-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    background: var(--bk-gray-100);
    border-radius: 0.75rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--bk-gray-700);
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

.bk-filter-bar__toggle-label:hover {
    background: var(--bk-gray-200);
}

.bk-filter-bar__toggle input:checked + .bk-filter-bar__toggle-label {
    background: var(--bk-primary-light);
    border-color: var(--bk-primary);
    color: var(--bk-gray-900);
}

.bk-filter-bar__toggle-label i {
    color: #9ca3af;
    transition: color 0.2s ease;
}

.bk-filter-bar__toggle input:checked + .bk-filter-bar__toggle-label i {
    color: var(--bk-primary);
}

/* Mobile Filter Button */
.bk-filter-bar__mobile-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--bk-primary);
    color: white;
    border: none;
    border-radius: 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.bk-filter-bar__mobile-btn:hover {
    background: var(--bk-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.bk-filter-bar__mobile-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 10px;
    height: 10px;
    background: #ef4444;
    border-radius: 50%;
    border: 2px solid white;
}

@media (min-width: 768px) {
    .bk-filter-bar__mobile-btn {
        display: none;
    }
}

/* Mobile Filter Visibility */
@media (max-width: 767px) {
    .bk-filter-bar__dropdown:not(.bk-filter-bar__sort),
    .bk-filter-bar__toggle {
        display: none;
    }
}

/* ================================================
   CATEGORY NAVIGATION (Icon Boxes)
   ================================================ */

.bk-category-nav {
    margin-bottom: 2rem;
}

.bk-category-nav__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--bk-gray-900);
    margin: 0 0 1rem;
}

.bk-category-nav__scroll {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 0.5rem;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--bk-gray-300) transparent;
}

.bk-category-nav__scroll::-webkit-scrollbar {
    height: 4px;
}

.bk-category-nav__scroll::-webkit-scrollbar-track {
    background: var(--bk-gray-100);
    border-radius: 4px;
}

.bk-category-nav__scroll::-webkit-scrollbar-thumb {
    background: var(--bk-gray-300);
    border-radius: 4px;
}

.bk-category-nav__scroll::-webkit-scrollbar-thumb:hover {
    background: var(--bk-gray-400);
}

/* Category Card */
.bk-category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    min-width: 120px;
    max-width: 140px;
    padding: 1rem 0.75rem;
    background: white;
    border-radius: 1rem;
    border: 1px solid var(--bk-gray-100);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    scroll-snap-align: start;
    cursor: pointer;
}

.bk-category-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    border-color: var(--bk-primary-light);
}

.bk-category-card__icon {
    width: 3.5rem;
    height: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bk-primary-light) 0%, #fef9c3 100%);
    border-radius: 1rem;
    color: var(--bk-primary);
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

.bk-category-card:hover .bk-category-card__icon {
    background: linear-gradient(135deg, var(--bk-primary) 0%, #fbbf24 100%);
    color: white;
    transform: scale(1.1);
}

.bk-category-card__info {
    text-align: center;
}

.bk-category-card__name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--bk-gray-900);
    margin: 0 0 0.25rem;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.bk-category-card__count {
    font-size: 0.75rem;
    color: var(--bk-gray-600);
}

@media (min-width: 640px) {
    .bk-category-card {
        min-width: 140px;
        max-width: 160px;
        padding: 1.25rem 1rem;
    }

    .bk-category-card__icon {
        width: 4rem;
        height: 4rem;
        font-size: 1.75rem;
    }

    .bk-category-card__name {
        font-size: 0.9375rem;
    }

    .bk-category-card__count {
        font-size: 0.8125rem;
    }
}

/* ================================================
   ACTIVE FILTERS DISPLAY
   ================================================ */

.bk-active-filters {
    background: white;
    border-radius: 1rem;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--bk-gray-100);
}

.bk-active-filters__content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.bk-active-filters__label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--bk-gray-600);
}

.bk-active-filters__tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    background: var(--bk-primary-light);
    border-radius: 2rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--bk-gray-900);
}

.bk-active-filters__tag button {
    width: 1rem;
    height: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.1);
    border: none;
    border-radius: 50%;
    color: inherit;
    cursor: pointer;
    font-size: 0.625rem;
    transition: all 0.2s ease;
}

.bk-active-filters__tag button:hover {
    background: rgba(0, 0, 0, 0.2);
}

.bk-active-filters__clear {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--bk-secondary);
    text-decoration: none;
    margin-left: auto;
    transition: color 0.2s ease;
}

.bk-active-filters__clear:hover {
    color: #2563eb;
    text-decoration: underline;
}

/* ================================================
   CATEGORY SECTION (Grouped Display)
   ================================================ */

.bk-category-section {
    margin-bottom: 2.5rem;
}

.bk-category-section__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: linear-gradient(135deg, var(--bk-gray-50) 0%, white 100%);
    border-radius: 1rem;
    margin-bottom: 1.25rem;
    border: 1px solid var(--bk-gray-100);
    flex-wrap: wrap;
}

.bk-category-section__title-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.bk-category-section__icon {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bk-primary) 0%, #fbbf24 100%);
    border-radius: 0.75rem;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.bk-category-section__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--bk-gray-900);
    margin: 0;
}

.bk-category-section__description {
    font-size: 0.875rem;
    color: var(--bk-gray-600);
    margin: 0.25rem 0 0;
}

.bk-category-section__view-all {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    background: white;
    border: 1px solid var(--bk-gray-200);
    border-radius: 0.75rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--bk-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.bk-category-section__view-all:hover {
    background: var(--bk-secondary);
    color: white;
    border-color: var(--bk-secondary);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

@media (max-width: 639px) {
    .bk-category-section__header {
        flex-direction: column;
        align-items: flex-start;
    }

    .bk-category-section__view-all {
        width: 100%;
        justify-content: center;
    }
}

/* ================================================
   BOOKS SECTION
   ================================================ */

.bk-books-section {
    /* Main container for filtered view */
}

/* ================================================
   BOOK GRID
   ================================================ */

.bk-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.bk-grid--horizontal {
    /* For horizontal scroll in category sections */
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

@media (min-width: 640px) {
    .bk-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .bk-grid--horizontal {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    }
}

@media (min-width: 768px) {
    .bk-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .bk-grid--horizontal {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
}

@media (min-width: 1024px) {
    .bk-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .bk-grid--horizontal {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    }
}

@media (min-width: 1280px) {
    .bk-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

@media (min-width: 1536px) {
    .bk-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

/* Horizontal scroll on mobile for category sections */
@media (max-width: 767px) {
    .bk-grid--horizontal {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 0.5rem;
        gap: 0.75rem;
    }

    .bk-grid--horizontal .bk-card {
        min-width: 200px;
        scroll-snap-align: start;
    }

    /* Force single column grid on mobile */
    .bk-grid {
        grid-template-columns: 1fr !important;
        display: grid !important;
    }
}

/* ================================================
   BOOK CARD
   ================================================ */

.bk-card {
    position: relative;
    background: white;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--bk-gray-100);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.bk-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
    border-color: var(--bk-primary-light);
}

/* Card Badges */
.bk-card__badges {
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.bk-card__badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.7rem;
    font-weight: 700;
    color: white;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(4px);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.bk-card__badge--featured {
    background: linear-gradient(135deg, var(--bk-primary) 0%, #fbbf24 100%);
}

.bk-card__badge--sinhala {
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
}

.bk-card__badge--english {
    background: linear-gradient(135deg, #059669 0%, #10b981 100%);
}

/* Card Image */
.bk-card__image-wrapper {
    position: relative;
    background: linear-gradient(135deg, var(--bk-gray-50) 0%, var(--bk-gray-100) 100%);
    overflow: hidden;
    padding-top: 130%;
}

.bk-card__image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.bk-card:hover .bk-card__image {
    transform: scale(1.08);
}

.bk-card__placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bk-gray-300);
    font-size: 2rem;
}

/* Card Content */
.bk-card__content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    min-width: 0;
}

.bk-card__category {
    font-size: 0.625rem;
    font-weight: 600;
    color: var(--bk-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.bk-card__title {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--bk-gray-900);
    margin: 0 0 0.5rem;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.bk-card__author {
    font-size: 0.8125rem;
    color: var(--bk-gray-600);
    margin: 0 0 0.75rem;
}

.bk-card__footer {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.bk-card__price-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.bk-card__price {
    font-size: 1.125rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--bk-gray-900) 0%, #374151 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bk-card__stock {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.bk-card__stock--in {
    color: var(--bk-success);
}

.bk-card__stock--out {
    color: var(--bk-danger);
}

/* Card Actions */
.bk-card__actions {
    display: flex;
    gap: 0.5rem;
}

.bk-card__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.625rem 0.875rem;
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.bk-card__btn--cart {
    flex: 1;
    background: linear-gradient(135deg, var(--bk-primary) 0%, #fbbf24 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.bk-card__btn--cart:hover {
    background: linear-gradient(135deg, var(--bk-primary-dark) 0%, var(--bk-primary) 100%);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
    transform: translateY(-1px);
}

.bk-card__btn--view {
    width: 2.25rem;
    padding: 0;
    background: white;
    border: 2px solid var(--bk-gray-200);
    color: var(--bk-gray-700);
}

.bk-card__btn--view:hover {
    background: var(--bk-gray-800);
    color: white;
    border-color: var(--bk-gray-800);
}

.bk-card__btn--disabled {
    flex: 1;
    background: var(--bk-gray-100);
    color: var(--bk-gray-400);
    cursor: not-allowed;
}

/* ================================================
   RESULTS HEADER
   ================================================ */

.bk-results-header {
    background: white;
    border-radius: 1rem;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.bk-results-header__info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.bk-results-header__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--bk-gray-900);
    margin: 0;
}

.bk-results-header__meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.9375rem;
    color: var(--bk-gray-600);
}

.bk-results-header__meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.bk-results-header__meta-icon {
    color: var(--bk-primary);
}

/* ================================================
   MOBILE FILTER DRAWER
   ================================================ */

.bk-filter-drawer {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    pointer-events: none;
}

.bk-filter-drawer--open {
    pointer-events: all;
}

.bk-filter-drawer__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.bk-filter-drawer--open .bk-filter-drawer__overlay {
    opacity: 1;
    pointer-events: all;
}

.bk-filter-drawer__panel {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 400px;
    background: white;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    pointer-events: all;
}

.bk-filter-drawer--open .bk-filter-drawer__panel {
    transform: translateX(0);
}

.bk-filter-drawer__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--bk-gray-200);
}

.bk-filter-drawer__header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--bk-gray-900);
    margin: 0;
}

.bk-filter-drawer__close {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bk-gray-100);
    border: none;
    border-radius: 0.5rem;
    color: var(--bk-gray-600);
    font-size: 1.125rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.bk-filter-drawer__close:hover {
    background: var(--bk-gray-200);
    color: var(--bk-gray-900);
}

.bk-filter-drawer__body {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
}

.bk-filter-drawer__group {
    margin-bottom: 1.25rem;
}

.bk-filter-drawer__group > label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--bk-gray-900);
    margin-bottom: 0.5rem;
}

.bk-filter-drawer__search {
    position: relative;
}

.bk-filter-drawer__search i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--bk-gray-400);
}

.bk-filter-drawer__search input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    border: 1px solid var(--bk-gray-300);
    border-radius: 0.75rem;
    font-size: 0.9375rem;
}

.bk-filter-drawer__search input:focus {
    outline: none;
    border-color: var(--bk-primary);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

.bk-filter-drawer__select {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--bk-gray-300);
    border-radius: 0.75rem;
    font-size: 0.9375rem;
    background: white;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
}

.bk-filter-drawer__select:focus {
    outline: none;
    border-color: var(--bk-primary);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

.bk-filter-drawer__checkbox {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem 1rem;
    background: var(--bk-gray-50);
    border-radius: 0.75rem;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

.bk-filter-drawer__checkbox input {
    display: none;
}

.bk-filter-drawer__checkbox span {
    font-size: 0.9375rem;
    color: var(--bk-gray-700);
}

.bk-filter-drawer__checkbox i {
    color: var(--bk-gray-300);
    transition: color 0.2s ease;
}

.bk-filter-drawer__checkbox input:checked + span {
    color: var(--bk-gray-900);
}

.bk-filter-drawer__checkbox input:checked ~ i {
    color: var(--bk-primary);
}

.bk-filter-drawer__footer {
    display: flex;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--bk-gray-200);
}

.bk-filter-drawer__btn {
    flex: 1;
    padding: 0.875rem 1rem;
    border-radius: 0.75rem;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.bk-filter-drawer__btn--clear {
    background: var(--bk-gray-100);
    color: var(--bk-gray-700);
}

.bk-filter-drawer__btn--clear:hover {
    background: var(--bk-gray-200);
}

.bk-filter-drawer__btn--apply {
    background: linear-gradient(135deg, var(--bk-primary) 0%, #fbbf24 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.bk-filter-drawer__btn--apply:hover {
    background: linear-gradient(135deg, var(--bk-primary-dark) 0%, var(--bk-primary) 100%);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
    transform: translateY(-1px);
}

/* ================================================
   EMPTY STATE
   ================================================ */

.bk-empty-state {
    text-align: center;
    padding: 4rem 2rem;
}

.bk-empty-state__icon {
    font-size: 4rem;
    color: var(--bk-gray-200);
    margin-bottom: 1rem;
}

.bk-empty-state__title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--bk-gray-900);
    margin: 0 0 0.5rem;
}

.bk-empty-state__text {
    font-size: 1rem;
    color: var(--bk-gray-600);
    margin: 0 0 1.5rem;
}

.bk-empty-state__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    background: var(--bk-primary);
    color: white;
    border-radius: 0.75rem;
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
}

.bk-empty-state__btn:hover {
    background: var(--bk-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

/* ================================================
   MODAL
   ================================================ */

.bk-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.bk-modal-overlay--hidden {
    display: none;
}

.bk-modal {
    background: white;
    border-radius: 1.25rem;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.bk-modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--bk-gray-200);
}

.bk-modal__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--bk-gray-900);
    margin: 0;
}

.bk-modal__close {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bk-gray-100);
    border: none;
    border-radius: 0.5rem;
    color: var(--bk-gray-600);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.bk-modal__close:hover {
    background: var(--bk-gray-200);
    color: var(--bk-gray-900);
}

.bk-modal__body {
    padding: 1.5rem;
    overflow-y: auto;
}

@media (min-width: 768px) {
    .bk-modal__body {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
}

.bk-modal__image {
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.bk-modal__image img {
    width: 100%;
    max-width: 280px;
    border-radius: 0.75rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.bk-modal__info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.bk-modal__book-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--bk-gray-900);
    margin: 0;
    line-height: 1.2;
}

.bk-modal__author {
    font-size: 1.125rem;
    color: var(--bk-gray-600);
}

.bk-modal__author strong {
    font-weight: 600;
}

.bk-modal__details {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.bk-modal__detail {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.bk-modal__detail-label {
    font-weight: 500;
    color: var(--bk-gray-600);
    min-width: 5rem;
}

.bk-modal__price {
    font-size: 1.5rem;
    color: var(--bk-primary);
    font-weight: 700;
}

.bk-modal__stock {
    color: var(--bk-success);
}

.bk-modal__actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.bk-modal__btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.bk-modal__btn--cart {
    background: linear-gradient(135deg, var(--bk-primary) 0%, #fbbf24 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.bk-modal__btn--cart:hover {
    background: linear-gradient(135deg, var(--bk-primary-dark) 0%, var(--bk-primary) 100%);
    transform: translateY(-2px);
}

.bk-modal__btn--close {
    background: var(--bk-gray-500);
    color: white;
}

.bk-modal__btn--close:hover {
    background: var(--bk-gray-600);
}

.bk-modal__btn--disabled {
    background: var(--bk-gray-300);
    color: var(--bk-gray-500);
    cursor: not-allowed;
}

.bk-modal__description {
    grid-column: 1 / -1;
    padding-top: 1.5rem;
    border-top: 1px solid var(--bk-gray-200);
}

.bk-modal__description-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--bk-gray-900);
    margin: 0 0 0.75rem;
}

.bk-modal__description-text {
    font-size: 1rem;
    color: var(--bk-gray-700);
    line-height: 1.7;
    margin: 0;
}

/* ================================================
   TOAST NOTIFICATIONS
   ================================================ */

.bk-toast {
    position: fixed;
    top: 6rem;
    right: 1rem;
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    color: white;
    font-weight: 500;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    transform: translateX(120%);
    transition: transform 0.3s ease;
    max-width: 350px;
}

.bk-toast--visible {
    transform: translateX(0);
}

.bk-toast--success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.bk-toast--error {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

/* ================================================
   ANIMATIONS
   ================================================ */

@keyframes bk-fade-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.bk-animate-fade-in {
    animation: bk-fade-in 0.4s ease-out;
}

/* ================================================
   RESPONSIVE UTILITIES
   ================================================ */

@media (max-width: 639px) {
    .bk-hide-on-mobile {
        display: none !important;
    }
}

@media (min-width: 640px) {
    .bk-hide-on-desktop {
        display: none !important;
    }
}

/* ================================================
   MOBILE OPTIMIZED CARD LAYOUT
   Horizontal cards for better mobile experience
   ================================================ */

@media (max-width: 767px) {
    /* Mobile Card - Modern Horizontal Layout */
    .bk-card {
        flex-direction: row !important;
        border-radius: 1rem !important;
        min-height: 7.75rem !important;
        max-height: 8.25rem !important;
        height: 7.75rem !important;
        box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08) !important;
        border: 1px solid rgba(245, 158, 11, 0.2) !important;
        background: linear-gradient(135deg, #ffffff 0%, #fafafa 100%) !important;
        overflow: hidden !important;
    }

    .bk-card:hover {
        transform: translateY(-2px) !important;
        box-shadow: 0 8px 24px rgba(245, 158, 11, 0.2) !important;
    }

    /* Mobile Card Image - Modern rounded */
    .bk-card__image-wrapper {
        width: 6.5rem !important;
        min-width: 6.5rem !important;
        height: calc(100% - 0.75rem) !important;
        margin: 0.375rem 0 0.375rem 0.375rem !important;
        padding-top: 0 !important;
        flex-shrink: 0 !important;
        border-radius: 0.75rem !important;
        overflow: hidden !important;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12) !important;
    }

    .bk-card__image {
        position: absolute !important;
        top: 0 !important;
        left: 0 !important;
        width: 100% !important;
        height: 100% !important;
        object-fit: cover !important;
    }

    .bk-card__placeholder {
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
        width: 100% !important;
        height: 100% !important;
        font-size: 1.25rem !important;
        background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%) !important;
    }

    /* Mobile Card Badges - Compact */
    .bk-card__badges {
        top: 0.5rem !important;
        left: 0.5rem !important;
        gap: 0.25rem !important;
        z-index: 10 !important;
    }

    .bk-card__badge {
        padding: 0.2rem 0.45rem !important;
        font-size: 0.55rem !important;
        gap: 0.15rem !important;
        font-weight: 700 !important;
        letter-spacing: 0.025em !important;
        backdrop-filter: blur(4px) !important;
    }

    /* Mobile Card Content */
    .bk-card__content {
        padding: 0.5rem 0.75rem 0.5rem 0.5rem !important;
        display: flex !important;
        flex-direction: column !important;
        justify-content: center !important;
        min-width: 0 !important;
        flex: 1 !important;
        gap: 0.375rem !important;
    }

    /* Category - Modern pill badge */
    .bk-card__category {
        font-size: 0.625rem !important;
        font-weight: 600 !important;
        margin: 0 !important;
        white-space: nowrap !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
        flex-shrink: 1 !important;
        color: #f59e0b !important;
        text-transform: uppercase !important;
        letter-spacing: 0.05em !important;
        background: rgba(245, 158, 11, 0.12) !important;
        padding: 0.2rem 0.5rem !important;
        border-radius: 0.375rem !important;
        display: inline-block !important;
        width: fit-content !important;
        max-width: 100% !important;
    }

    /* Title - Bold and prominent */
    .bk-card__title {
        font-size: 0.9rem !important;
        font-weight: 700 !important;
        margin: 0 !important;
        line-height: 1.3 !important;
        -webkit-line-clamp: 2 !important;
        max-height: 2.35rem !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
        display: -webkit-box !important;
        -webkit-box-orient: vertical !important;
        color: #111827 !important;
        flex-shrink: 1 !important;
        word-break: break-word !important;
    }

    /* Author - Hidden on mobile */
    .bk-card__author {
        display: none !important;
    }

    /* Mobile Card Footer - Modern inline layout */
    .bk-card__footer {
        gap: 0.5rem !important;
        margin-top: auto !important;
        flex-direction: row !important;
        align-items: center !important;
        justify-content: space-between !important;
    }

    .bk-card__price-row {
        align-items: center !important;
        gap: 0.25rem !important;
        flex: 0 0 auto !important;
    }

    /* Price - Gradient text */
    .bk-card__price {
        font-size: 1.05rem !important;
        font-weight: 800 !important;
        background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%) !important;
        -webkit-background-clip: text !important;
        -webkit-text-fill-color: transparent !important;
        background-clip: text !important;
    }

    /* Stock - Hidden on mobile */
    .bk-card__stock {
        display: none !important;
    }

    /* Mobile Card Buttons - Modern compact */
    .bk-card__actions {
        gap: 0.375rem !important;
        flex: 0 0 auto !important;
        display: flex !important;
        align-items: center !important;
    }

    .bk-card__btn {
        padding: 0.5rem 0.75rem !important;
        font-size: 0.75rem !important;
        border-radius: 0.5rem !important;
        gap: 0.25rem !important;
        height: 2.125rem !important;
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        flex: 0 0 auto !important;
        font-weight: 600 !important;
        transition: all 0.2s ease !important;
    }

    .bk-card__btn--cart {
        flex: 0 0 auto !important;
        padding: 0.5rem 0.875rem !important;
        min-width: 3rem !important;
        background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%) !important;
        color: white !important;
        box-shadow: 0 2px 6px rgba(245, 158, 11, 0.25) !important;
        border: none !important;
    }

    .bk-card__btn--cart:hover {
        box-shadow: 0 4px 10px rgba(245, 158, 11, 0.35) !important;
    }

    .bk-card__btn--view {
        width: 2.125rem !important;
        padding: 0 !important;
        background: #f3f4f6 !important;
        color: #6b7280 !important;
        border: none !important;
    }

    .bk-card__btn--view:hover {
        background: #e5e7eb !important;
        color: #374151 !important;
    }

    /* Mobile Grid */
    .bk-grid {
        grid-template-columns: 1fr !important;
        gap: 0.75rem !important;
    }

    /* Mobile Category Cards */
    .bk-category-card {
        min-width: 110px !important;
        max-width: 120px !important;
        padding: 0.75rem 0.5rem !important;
    }

    .bk-category-card__icon {
        width: 2.75rem !important;
        height: 2.75rem !important;
        font-size: 1.25rem !important;
    }

    .bk-category-card__name {
        font-size: 0.75rem !important;
        -webkit-line-clamp: 2 !important;
    }

    .bk-category-card__count {
        font-size: 0.65rem !important;
    }

    /* Mobile Category Section Header */
    .bk-category-section__header {
        padding: 0.875rem 1rem !important;
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: 0.75rem !important;
    }

    .bk-category-section__title-row {
        gap: 0.625rem !important;
    }

    .bk-category-section__icon {
        width: 2.25rem !important;
        height: 2.25rem !important;
        font-size: 1rem !important;
    }

    .bk-category-section__title {
        font-size: 1rem !important;
    }

    .bk-category-section__description {
        font-size: 0.75rem !important;
    }

    .bk-category-section__view-all {
        width: 100% !important;
        justify-content: center !important;
        padding: 0.5rem 0.75rem !important;
        font-size: 0.8rem !important;
    }

    /* Mobile Category Nav */
    .bk-category-nav {
        margin-bottom: 1rem !important;
    }

    .bk-category-nav__title {
        font-size: 1rem !important;
        margin-bottom: 0.625rem !important;
    }

    .bk-category-nav__scroll {
        gap: 0.625rem !important;
        padding-bottom: 0.375rem !important;
    }
}

/* Extra small mobile optimizations */
@media (max-width: 374px) {
    .bk-card {
        min-height: 7rem !important;
        max-height: 7.5rem !important;
        height: 7rem !important;
    }

    .bk-card__image-wrapper {
        width: 6rem !important;
        min-width: 6rem !important;
    }

    .bk-card__content {
        padding: 0.45rem 0.625rem 0.45rem 0.45rem !important;
        gap: 0.25rem !important;
    }

    .bk-card__category {
        font-size: 0.575rem !important;
        padding: 0.15rem 0.4rem !important;
    }

    .bk-card__title {
        font-size: 0.85rem !important;
        max-height: 2.2rem !important;
        color: #111827 !important;
    }

    .bk-card__author {
        display: none !important;
    }

    .bk-card__stock {
        display: none !important;
    }

    .bk-card__price {
        font-size: 0.95rem !important;
    }

    .bk-card__btn {
        font-size: 0.7rem !important;
        padding: 0.4rem 0.625rem !important;
        height: 2rem !important;
    }

    .bk-card__btn--cart {
        min-width: 2.75rem !important;
    }

    .bk-card__btn--view {
        width: 2rem !important;
    }
}

/* ================================================
   PRINT STYLES
   ================================================ */

@media print {
    .bk-filter-bar,
    .bk-filter-drawer,
    .bk-category-nav,
    .bk-active-filters,
    .bk-pagination,
    .bk-card__btn {
        display: none !important;
    }
}

/* ================================================
   INTERACTIVE FILTER FLOW MAP (hf-flow-*)
   Yellow/Black/White theme matching
   ================================================ */

.hf-flow {
    background: linear-gradient(135deg, #fffbeb 0%, #ffffff 50%, #fefce8 100%);
    border: 2px solid #fde68a;
    border-radius: 1.25rem;
    padding: 2rem 2rem 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 24px rgba(245, 158, 11, 0.08);
    position: relative;
    overflow: hidden;
}

.hf-flow::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

/* Header */
.hf-flow__header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.75rem;
    position: relative;
    z-index: 1;
}

.hf-flow__icon-wrap {
    width: 52px;
    height: 52px;
    border-radius: 1rem;
    background: linear-gradient(135deg, var(--bk-primary), var(--bk-primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.35rem;
    flex-shrink: 0;
    box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
}

.hf-flow__heading {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--bk-gray-800);
    margin: 0;
    line-height: 1.2;
}

.hf-flow__subtext {
    font-size: 0.85rem;
    color: #6b7280;
    margin: 0.15rem 0 0;
}

.hf-flow__reset {
    margin-left: auto;
    padding: 0.5rem 1rem;
    border-radius: 0.65rem;
    background: #fef2f2;
    color: #dc2626;
    font-size: 0.8rem;
    font-weight: 700;
    border: 2px solid #fecaca;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
    white-space: nowrap;
}

.hf-flow__reset:hover {
    background: #fee2e2;
    border-color: #f87171;
}

/* Flow Map Container */
.hf-flow__map {
    max-width: 560px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* Level */
.hf-flow__level {
    margin-bottom: 0;
    animation: hfLevelSlideIn 0.4s ease forwards;
}

.hf-flow__level--hidden {
    display: none !important;
}

@keyframes hfLevelSlideIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.hf-flow__level-header {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    margin-bottom: 0.75rem;
}

.hf-flow__badge {
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.65rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #fff;
    flex-shrink: 0;
}

.hf-flow__badge--green {
    background: linear-gradient(135deg, #059669, #10b981);
}

.hf-flow__badge--red {
    background: linear-gradient(135deg, #dc2626, #ef4444);
}

.hf-flow__badge--amber {
    background: linear-gradient(135deg, var(--bk-primary-dark), var(--bk-primary));
}

.hf-flow__badge--dark {
    background: linear-gradient(135deg, #1e293b, #374151);
}

.hf-flow__level-title {
    font-weight: 700;
    color: var(--bk-gray-800);
    font-size: 0.95rem;
}

/* Cards Grid */
.hf-flow__cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.75rem;
}

.hf-flow__cards--2col {
    grid-template-columns: repeat(2, 1fr);
}

/* Card */
.hf-flow__card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.25rem 1rem;
    border-radius: 1rem;
    background: #fff;
    border: 2px solid #e5e7eb;
    cursor: pointer;
    color: var(--bk-gray-800);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    text-align: center;
    font-family: inherit;
    position: relative;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.hf-flow__card:hover {
    border-color: var(--bk-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(245, 158, 11, 0.15);
}

.hf-flow__card--active {
    border-color: var(--bk-primary) !important;
    background: linear-gradient(135deg, #fffbeb, #fef3c7) !important;
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.2) !important;
    transform: translateY(-2px);
}

.hf-flow__card--active::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free', 'Font Awesome 5 Free';
    font-weight: 900;
    position: absolute;
    top: 8px;
    right: 10px;
    width: 22px;
    height: 22px;
    background: var(--bk-primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6rem;
    box-shadow: 0 2px 6px rgba(245, 158, 11, 0.3);
}

/* Card Icon */
.hf-flow__card-icon {
    width: 52px;
    height: 52px;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.3rem;
    transition: transform 0.3s ease;
}

.hf-flow__card:hover .hf-flow__card-icon {
    transform: scale(1.1);
}

.hf-flow__card-icon--sinhala { background: linear-gradient(135deg, #059669, #10b981); }
.hf-flow__card-icon--english { background: linear-gradient(135deg, #2563eb, #3b82f6); }
.hf-flow__card-icon--mcq { background: linear-gradient(135deg, #dc2626, #ef4444); }
.hf-flow__card-icon--essay { background: linear-gradient(135deg, #7c3aed, #8b5cf6); }
.hf-flow__card-icon--low { background: linear-gradient(135deg, var(--bk-primary-dark), var(--bk-primary)); }
.hf-flow__card-icon--high { background: linear-gradient(135deg, #e11d48, #f43f5e); }
.hf-flow__card-icon--normal { background: linear-gradient(135deg, #0891b2, #06b6d4); }
.hf-flow__card-icon--full { background: linear-gradient(135deg, #1e293b, #475569); }

.hf-flow__card-name {
    font-weight: 700;
    font-size: 0.9rem;
    line-height: 1.2;
}

.hf-flow__card-hint {
    font-size: 0.72rem;
    color: var(--bk-primary-dark);
    font-weight: 600;
    opacity: 0.7;
}

/* Connector */
.hf-flow__connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.6rem 0;
}

.hf-flow__connector-line {
    width: 3px;
    height: 22px;
    background: linear-gradient(to bottom, #fde68a, var(--bk-primary));
    border-radius: 4px;
}

.hf-flow__connector-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--bk-primary);
    margin-top: -1px;
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
}

/* Breadcrumb */
.hf-flow__breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-top: 1.5rem;
    padding: 0.75rem 1rem;
    background: #fff;
    border: 2px solid #fde68a;
    border-radius: 0.75rem;
    flex-wrap: wrap;
    font-size: 0.8rem;
    color: var(--bk-primary-dark);
    font-weight: 600;
}

.hf-flow__breadcrumb > i:first-child {
    color: var(--bk-primary);
}

.hf-flow__breadcrumb-label {
    font-weight: 700;
    color: var(--bk-gray-800);
    font-size: 0.78rem;
}

.hf-flow__breadcrumb-trail {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.hf-flow__breadcrumb-arrow {
    font-size: 0.55rem;
    color: #d1d5db;
}

.hf-flow__tag {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.7rem;
    border-radius: 2rem;
    background: var(--bk-primary-light);
    color: var(--bk-primary-dark);
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid rgba(245, 158, 11, 0.25);
}

.hf-flow__tag:hover {
    background: #fde68a;
}

.hf-flow__tag-remove {
    font-size: 0.6rem;
    opacity: 0.6;
}

.hf-flow__tag:hover .hf-flow__tag-remove {
    opacity: 1;
}

/* Results info */
.hf-flow__results {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1rem;
    background: #fff;
    border: 2px solid #fde68a;
    border-radius: 0.65rem;
    margin-top: 0.75rem;
    font-weight: 700;
    color: var(--bk-primary-dark);
    font-size: 0.85rem;
}

.hf-flow__results i {
    color: var(--bk-primary);
}

/* Books Grid */
.hf-books-grid {
    margin-bottom: 2rem;
    animation: hfFadeIn 0.4s ease;
}

/* ================================================
   GROUPED CATEGORY RESULTS (gcr-*)
   2-column category boxes with compact book rows
   ================================================ */

/* Wrapper: spans full width of parent bk-grid */
.gcr-grid {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 768px) {
    .gcr-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Each category box */
.gcr-box {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 1rem;
    overflow: hidden;
    transition: box-shadow 0.3s ease;
}

.gcr-box:hover {
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.gcr-box__header {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg, #fffbeb, #fef3c7);
    border-bottom: 1px solid #fde68a;
}

.gcr-box__icon {
    width: 34px;
    height: 34px;
    border-radius: 0.625rem;
    background: linear-gradient(135deg, var(--bk-primary), var(--bk-primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.gcr-box__meta {
    min-width: 0;
}

.gcr-box__title {
    font-size: 0.9rem;
    font-weight: 700;
    color: #1f2937;
    margin: 0;
    line-height: 1.25;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.gcr-box__count {
    font-size: 0.65rem;
    color: #92400e;
    font-weight: 600;
}

/* Book list inside box */
.gcr-box__cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.625rem;
    padding: 0.75rem;
}

@media (min-width: 640px) {
    .gcr-box__cards {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Vertical mini-card */
.gcr-card {
    background: #fff;
    border: 1px solid #f3f4f6;
    border-radius: 0.75rem;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    flex-direction: column;
}

.gcr-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    border-color: #fde68a;
}

.gcr-card__cover {
    position: relative;
    background: #f9fafb;
    padding-top: 120%;
    overflow: hidden;
}

.gcr-card__img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.gcr-card:hover .gcr-card__img {
    transform: scale(1.05);
}

.gcr-card__img--empty {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #d1d5db;
    font-size: 1.5rem;
}

.gcr-card__body {
    padding: 0.625rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.gcr-card__title {
    font-size: 0.78rem;
    font-weight: 600;
    color: #1f2937;
    margin: 0 0 0.25rem;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.gcr-card__price {
    font-size: 0.85rem;
    font-weight: 800;
    color: #b45309;
    margin-bottom: 0.375rem;
}

.gcr-card__actions {
    display: flex;
    gap: 0.375rem;
    margin-top: auto;
}

.gcr-card__btn {
    flex: 1;
    height: 30px;
    border-radius: 0.5rem;
    border: 1px solid #e5e7eb;
    background: #fff;
    color: #6b7280;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.gcr-card__btn:hover {
    background: #f59e0b;
    color: #fff;
    border-color: #f59e0b;
}

.gcr-card__btn--cart {
    color: #f59e0b;
    border-color: #fde68a;
}

.gcr-card__btn--view {
    color: #6b7280;
}

.gcr-card__btn--disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.gcr-card__btn--disabled:hover {
    background: #fff;
    color: #6b7280;
    border-color: #e5e7eb;
}

/* Mobile tweaks */
@media (max-width: 640px) {
    .gcr-box__header {
        padding: 0.625rem 0.75rem;
    }
    .gcr-box__icon {
        width: 30px;
        height: 30px;
        font-size: 0.75rem;
    }
    .gcr-box__title {
        font-size: 0.8rem;
    }
    .gcr-card__body {
        padding: 0.5rem;
    }
    .gcr-card__title {
        font-size: 0.72rem;
    }
    .gcr-card__price {
        font-size: 0.78rem;
    }
    .gcr-card__btn {
        height: 26px;
        font-size: 0.6rem;
    }
}

@keyframes hfFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes hfCardFadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Loading */
.hf-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: var(--bk-primary-dark);
    gap: 1rem;
}

.hf-loading__spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--bk-primary-light);
    border-top-color: var(--bk-primary);
    border-radius: 50%;
    animation: hfSpin 0.8s linear infinite;
}

@keyframes hfSpin {
    to { transform: rotate(360deg); }
}

.hf-loading p {
    font-weight: 500;
    font-size: 0.9rem;
    margin: 0;
}

/* Divider */
.hf-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 2rem 0;
    padding: 0 1rem;
}

.hf-divider__line {
    flex: 1;
    height: 2px;
    background: linear-gradient(90deg, transparent, #d1d5db, transparent);
}

.hf-divider__text {
    font-size: 0.8rem;
    color: #9ca3af;
    font-weight: 500;
    white-space: nowrap;
}

/* ================================================
   MOBILE RESPONSIVE - Filter Flow Map
   ================================================ */

@media (max-width: 640px) {
    .hf-flow {
        padding: 1.25rem 1rem 1rem;
        border-radius: 1rem;
        margin-bottom: 1.25rem;
    }

    .hf-flow__header {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .hf-flow__icon-wrap {
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
        border-radius: 0.75rem;
    }

    .hf-flow__heading {
        font-size: 1.15rem;
    }

    .hf-flow__subtext {
        font-size: 0.78rem;
    }

    .hf-flow__reset {
        font-size: 0.75rem;
        padding: 0.4rem 0.8rem;
    }

    .hf-flow__map {
        max-width: 100%;
    }

    .hf-flow__cards--2col {
        gap: 0.6rem;
    }

    .hf-flow__card {
        padding: 1rem 0.75rem;
    }

    .hf-flow__card-icon {
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
    }

    .hf-flow__card-name {
        font-size: 0.82rem;
    }

    .hf-flow__card-hint {
        font-size: 0.65rem;
    }

    .hf-flow__card--active::after {
        width: 18px;
        height: 18px;
        font-size: 0.5rem;
        top: 6px;
        right: 6px;
    }

    .hf-flow__connector-line {
        height: 16px;
    }

    .hf-flow__breadcrumb {
        font-size: 0.75rem;
        padding: 0.6rem 0.75rem;
    }

    .hf-flow__tag {
        font-size: 0.7rem;
        padding: 0.25rem 0.55rem;
    }
}

@media (max-width: 380px) {
    .hf-flow__cards--2col {
        grid-template-columns: 1fr;
    }

    .hf-flow__header {
        text-align: center;
        justify-content: center;
    }

    .hf-flow__reset {
        width: 100%;
        text-align: center;
        margin-left: 0;
    }
}

/* ================================================
   HOME PAGE PREVIEW CARD (hp-preview-card)
   Clean, minimal book card without cart/eye/author
   ================================================ */

.hp-preview-card {
    position: relative;
    background: white;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    border: 1px solid #f3f4f6;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.hp-preview-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0,0,0,0.1);
    border-color: #fde68a;
}

.hp-preview-card__img {
    position: relative;
    background: linear-gradient(135deg, #f9fafb, #f3f4f6);
    overflow: hidden;
    padding-top: 130%;
}

.hp-preview-card__img img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.hp-preview-card:hover .hp-preview-card__img img {
    transform: scale(1.06);
}

.hp-preview-card__placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #d1d5db;
    font-size: 2rem;
}

.hp-preview-card__badge {
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    z-index: 5;
    padding: 0.25rem 0.6rem;
    border-radius: 2rem;
    font-size: 0.65rem;
    font-weight: 700;
    color: #fff;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

.hp-preview-card__badge--sin {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
}

.hp-preview-card__badge--en {
    background: linear-gradient(135deg, #059669, #10b981);
}

.hp-preview-card__body {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 0.875rem;
    min-width: 0;
}

.hp-preview-card__cat {
    font-size: 0.6rem;
    font-weight: 600;
    color: #9ca3af;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.2rem;
}

.hp-preview-card__title {
    font-size: 0.875rem;
    font-weight: 700;
    color: #1f2937;
    margin: 0 0 auto;
    line-height: 1.35;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.4em;
}

.hp-preview-card__bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 0.625rem;
    padding-top: 0.5rem;
    border-top: 1px solid #f3f4f6;
}

.hp-preview-card__price {
    font-size: 1rem;
    font-weight: 800;
    color: #1f2937;
}

.hp-preview-card__stock {
    font-size: 0.65rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.hp-preview-card__stock--in {
    color: #059669;
}

.hp-preview-card__stock--out {
    color: #ef4444;
}

/* Preview card responsive */
@media (max-width: 640px) {
    .hp-preview-card__img {
        padding-top: 120%;
    }

    .hp-preview-card__body {
        padding: 0.5rem 0.6rem 0.6rem;
    }

    .hp-preview-card__cat {
        font-size: 0.5rem;
        margin-bottom: 0.1rem;
    }

    .hp-preview-card__title {
        font-size: 0.7rem;
        -webkit-line-clamp: 2;
        min-height: 1.9em;
        line-height: 1.3;
    }

    .hp-preview-card__bottom {
        margin-top: 0.4rem;
        padding-top: 0.35rem;
    }

    .hp-preview-card__price {
        font-size: 0.8rem;
    }

    .hp-preview-card__stock {
        font-size: 0.55rem;
    }

    .hp-preview-card__badge {
        top: 0.35rem;
        left: 0.35rem;
        padding: 0.15rem 0.45rem;
        font-size: 0.55rem;
    }

    .hp-preview-card {
        border-radius: 0.75rem;
    }
}

/* Homepage grid: 2 cols on mobile, 3 on tablet, 6 on desktop */
.hp-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 2rem;
}

@media (min-width: 640px) {
    .hp-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
    }
}

@media (min-width: 1024px) {
    .hp-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

/* ================================================
   HOME PAGE FLOW MAP (hp-flow-*)
   ================================================ */

.hp-flow-map {
    max-width: 800px;
    margin: 0 auto;
}

.hp-flow-level {
    margin-bottom: 0;
}

.hp-flow-level__header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.hp-flow-level__badge {
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hp-flow-level__badge--dark {
    background: linear-gradient(135deg, #1e3a5f, #1e40af);
    color: white;
}

.hp-flow-level__badge--blue {
    background: linear-gradient(135deg, #3b82f6, #60a5fa);
    color: white;
}

.hp-flow-level__badge--purple {
    background: linear-gradient(135deg, #7c3aed, #a78bfa);
    color: white;
}

.hp-flow-level__title {
    font-weight: 700;
    color: #1e293b;
    font-size: 1rem;
}

.hp-flow-level__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.75rem;
}

.hp-flow-level__grid--2col {
    grid-template-columns: repeat(2, 1fr);
    max-width: 500px;
    margin: 0 auto;
}

/* Flow Card */
.hp-flow-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.25rem 1rem;
    border-radius: 1rem;
    background: white;
    border: 2px solid #e5e7eb;
    text-decoration: none;
    color: #1f2937;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    text-align: center;
}

.hp-flow-card:hover {
    border-color: #818cf8;
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(99, 102, 241, 0.15);
}

.hp-flow-card__icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    transition: transform 0.3s ease;
}

.hp-flow-card:hover .hp-flow-card__icon {
    transform: scale(1.1);
}

.hp-flow-card__name {
    font-weight: 700;
    font-size: 0.85rem;
    line-height: 1.2;
}

.hp-flow-card__count {
    font-size: 0.7rem;
    color: #9ca3af;
}

.hp-flow-card__hint {
    font-size: 0.7rem;
    color: #6366f1;
    font-weight: 500;
}

.hp-flow-card__arrow {
    position: absolute;
    top: 50%;
    right: 10px;
    transform: translateY(-50%);
    color: #d1d5db;
    opacity: 0;
    transition: all 0.3s ease;
}

.hp-flow-card:hover .hp-flow-card__arrow {
    opacity: 1;
    right: 6px;
    color: #6366f1;
}

/* Flow Connector */
.hp-flow-connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem 0;
}

.hp-flow-connector__line {
    width: 3px;
    height: 24px;
    background: linear-gradient(to bottom, #c7d2fe, #a5b4fc);
    border-radius: 4px;
}

.hp-flow-connector__dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #6366f1;
    margin-top: -1px;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

/* Mobile: Home page flow */
@media (max-width: 640px) {
    .hp-flow-level__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .hp-flow-level__grid--2col {
        max-width: 100%;
        margin: 0 auto;
    }

    .hp-flow-card {
        padding: 1rem 0.75rem;
    }

    .hp-flow-card__icon {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }

    .hp-flow-card__name {
        font-size: 0.8rem;
    }

    .hp-flow-card__arrow {
        display: none;
    }

    .hp-flow-connector__line {
        height: 16px;
    }
}