/* ═══════════════════════════════════════════════════════
   COURSES BROWSE PAGE — GUM Client
   Sidebar filters + responsive course grid + pagination
   ═══════════════════════════════════════════════════════ */

/* ── Browse Section ──────────────────────────────────── */
.browse {
    padding: 0 0 60px;
    position: relative;
}

/* ── Toolbar ─────────────────────────────────────────── */
.browse__toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    padding: 16px 24px;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    border: 1px solid var(--sky-100, #e0f2fe);
    border-radius: var(--radius-md, 16px);
}

.browse__count {
    font-size: 0.95rem;
    color: var(--slate-600, #475569);
}
.browse__count strong {
    color: var(--sky-700, #0369a1);
}

.browse__sort,
.browse__per-page {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    color: var(--slate-500, #64748b);
}
.browse__sort select,
.browse__per-page select {
    padding: 8px 14px;
    border: 1px solid var(--sky-200, #bae6fd);
    border-radius: var(--radius-sm, 10px);
    background: #fff;
    font-size: 0.88rem;
    color: var(--slate-700, #334155);
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}
.browse__sort select:focus,
.browse__per-page select:focus {
    border-color: var(--sky-400, #38bdf8);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.filter-toggle {
    display: none;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px solid var(--sky-200, #bae6fd);
    border-radius: var(--radius-sm, 10px);
    background: #fff;
    color: var(--sky-700, #0369a1);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.filter-toggle:hover {
    background: var(--sky-50, #f0f9ff);
    border-color: var(--sky-300, #7dd3fc);
}

/* ── Filter Chips ────────────────────────────────────── */
.filter-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
    min-height: 0;
}
.filter-chips:empty {
    display: none;
}

.filter-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--sky-50, #f0f9ff);
    border: 1px solid var(--sky-200, #bae6fd);
    border-radius: 50px;
    font-size: 0.82rem;
    color: var(--sky-700, #0369a1);
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}
.filter-chip:hover {
    background: var(--sky-100, #e0f2fe);
    border-color: var(--sky-300, #7dd3fc);
}
.filter-chip i {
    font-size: 0.7rem;
    opacity: 0.7;
}

/* ── Layout: Sidebar + Grid ──────────────────────────── */
.browse__layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 28px;
    align-items: start;
}

/* Main content area (grid + pagination) */
.browse__main {
    min-width: 0;
}

/* ── Filter Panel ────────────────────────────────────── */
.filter-panel {
    position: sticky;
    top: 90px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    border: 1px solid var(--sky-100, #e0f2fe);
    border-radius: var(--radius-lg, 24px);
    padding: 24px;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--sky-200, #bae6fd) transparent;
}
.filter-panel::-webkit-scrollbar { width: 5px; }
.filter-panel::-webkit-scrollbar-thumb {
    background: var(--sky-200, #bae6fd);
    border-radius: 10px;
}

.filter-panel__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--sky-100, #e0f2fe);
}
.filter-panel__title {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--slate-800, #1e293b);
    display: flex;
    align-items: center;
    gap: 8px;
}
.filter-panel__title i {
    color: var(--sky-500, #0ea5e9);
}
.filter-panel__clear {
    background: none;
    border: none;
    color: var(--sky-600, #0284c7);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    padding: 4px 10px;
    border-radius: 6px;
    transition: all 0.2s;
}
.filter-panel__clear:hover {
    background: var(--sky-50, #f0f9ff);
    color: var(--sky-700, #0369a1);
}

/* Filter Groups */
.filter-group {
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}
.filter-group:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}
.filter-group__label {
    font-weight: 700;
    font-size: 0.88rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--slate-500, #64748b);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.filter-group__label i {
    font-size: 0.85rem;
    color: var(--sky-400, #38bdf8);
}

/* Search Input */
.filter-search {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--sky-200, #bae6fd);
    border-radius: var(--radius-sm, 10px);
    background: #fff;
    font-size: 0.92rem;
    color: var(--slate-700, #334155);
    outline: none;
    transition: all 0.2s;
    box-sizing: border-box;
}
.filter-search:focus {
    border-color: var(--sky-400, #38bdf8);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.12);
}
.filter-search::placeholder {
    color: var(--slate-400, #94a3b8);
}

/* Checkbox Filters */
.filter-check {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 5px 0;
    cursor: pointer;
    font-size: 0.92rem;
    color: var(--slate-600, #475569);
    transition: color 0.2s;
    user-select: none;
}
.filter-check:hover {
    color: var(--slate-800, #1e293b);
}
.filter-check input[type="checkbox"] {
    display: none;
}
.filter-check__box {
    width: 20px;
    height: 20px;
    border: 2px solid var(--sky-200, #bae6fd);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    flex-shrink: 0;
    transition: all 0.2s;
}
.filter-check__box i {
    font-size: 0.65rem;
    color: #fff;
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.2s;
}
.filter-check input:checked + .filter-check__box {
    background: var(--sky-500, #0ea5e9);
    border-color: var(--sky-500, #0ea5e9);
}
.filter-check input:checked + .filter-check__box i {
    opacity: 1;
    transform: scale(1);
}
.filter-check__count {
    margin-left: auto;
    font-size: 0.78rem;
    color: var(--slate-400, #94a3b8);
    background: var(--sky-50, #f0f9ff);
    padding: 1px 8px;
    border-radius: 50px;
    font-weight: 600;
}

/* Price Range */
.filter-range {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}
.filter-range input {
    flex: 1;
    padding: 8px 10px;
    border: 1px solid var(--sky-200, #bae6fd);
    border-radius: 8px;
    background: #fff;
    font-size: 0.85rem;
    color: var(--slate-700, #334155);
    outline: none;
    width: 0;
    min-width: 0;
    transition: border-color 0.2s;
}
.filter-range input:focus {
    border-color: var(--sky-400, #38bdf8);
}
.filter-range input::placeholder {
    color: var(--slate-400, #94a3b8);
    font-size: 0.82rem;
}
.filter-range__sep {
    color: var(--slate-300, #cbd5e1);
    font-size: 0.9rem;
}

/* ── Course Grid ─────────────────────────────────────── */
.browse__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    min-height: 200px;
}

/* Loading state */
.browse__loading {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 60px 20px;
    color: var(--slate-400, #94a3b8);
    font-size: 1rem;
}

/* Empty state */
.browse__empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 80px 20px;
}
.browse__empty-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: var(--sky-50, #f0f9ff);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--sky-300, #7dd3fc);
}
.browse__empty-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--slate-700, #334155);
    margin-bottom: 8px;
}
.browse__empty-desc {
    color: var(--slate-500, #64748b);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

/* ── Course Card ─────────────────────────────────────── */
.course-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border: 1px solid var(--sky-100, #e0f2fe);
    border-radius: var(--radius-lg, 24px);
    overflow: hidden;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
}
.course-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 60px rgba(3, 105, 161, 0.12), 0 8px 24px rgba(0, 0, 0, 0.06);
    border-color: var(--sky-200, #bae6fd);
}

/* Card Thumbnail */
.course-card__thumb {
    position: relative;
    height: 200px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}
.course-card__thumb-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(0, 0, 0, 0.3) 100%);
    pointer-events: none;
}
.course-card__thumb-badges {
    position: absolute;
    top: 14px;
    left: 14px;
    display: flex;
    gap: 6px;
    z-index: 2;
    flex-wrap: wrap;
}

/* Pricing block (in card body, above CTA) */
.course-card__pricing {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 0 2px;
    flex-wrap: wrap;
}
.course-card__prices {
    display: flex;
    align-items: center;
    gap: 10px;
}
.course-card__price-current {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--slate-800, #1e293b);
}
.course-card__price-original {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--slate-400, #94a3b8);
    text-decoration: line-through;
}
.course-card__rating {
    font-size: 0.95rem;
    font-weight: 700;
    color: #f59e0b;
}
.course-card__rating i {
    color: #f59e0b;
    font-size: 0.85rem;
    margin-right: 3px;
}
.course-card__price-off {
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
    background: var(--emerald, #10b981);
    padding: 2px 10px;
    border-radius: 50px;
    letter-spacing: 0.3px;
}
.course-card__free-badge {
    background: var(--emerald, #10b981);
    color: #fff;
    font-weight: 700;
    font-size: 0.88rem;
    padding: 6px 18px;
    border-radius: 50px;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 12px rgba(16, 185, 129, 0.3);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.3px;
    text-transform: uppercase;
    white-space: nowrap;
}
.badge--sky {
    background: rgba(14, 165, 233, 0.9);
    color: #fff;
}
.badge--green {
    background: rgba(16, 185, 129, 0.9);
    color: #fff;
}
.badge--amber {
    background: rgba(245, 158, 11, 0.9);
    color: #fff;
}
.badge--orange {
    background: rgba(249, 115, 22, 0.9);
    color: #fff;
}
.badge--rose {
    background: rgba(244, 63, 94, 0.9);
    color: #fff;
}
.badge--mega {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: #fff;
    box-shadow: 0 2px 12px rgba(99, 102, 241, 0.3);
}
.badge--new {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: #fff;
    animation: badge-glow 2s ease-in-out infinite;
}
@keyframes badge-glow {
    0%, 100% { box-shadow: 0 0 6px rgba(245, 158, 11, 0.3); }
    50% { box-shadow: 0 0 14px rgba(245, 158, 11, 0.5); }
}

/* Card Body */
.course-card__body {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.course-card__category {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--sky-500, #0ea5e9);
}
.course-card__title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--slate-800, #1e293b);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.course-card__intro {
    font-size: 0.95rem;
    color: var(--slate-500, #64748b);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.course-card__meta {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    font-size: 0.95rem;
    color: var(--slate-500, #64748b);
    margin-top: auto;
    padding-top: 8px;
}
.course-card__meta i {
    font-size: 0.85rem;
    margin-right: 3px;
}
.course-card__meta .rating {
    color: #f59e0b;
    font-weight: 700;
}
.course-card__meta .rating i {
    color: #f59e0b;
}

.course-card__cta {
    margin-top: 12px;
    text-align: center;
    width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

/* ── Pagination ──────────────────────────────────────── */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 40px;
    padding: 20px 0;
}
.pagination:empty {
    display: none;
}

.pagination__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 40px;
    height: 40px;
    padding: 0 14px;
    border: 1px solid var(--sky-200, #bae6fd);
    border-radius: var(--radius-sm, 10px);
    background: #fff;
    color: var(--slate-600, #475569);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}
.pagination__btn:hover:not(.disabled):not(.active) {
    background: var(--sky-50, #f0f9ff);
    border-color: var(--sky-300, #7dd3fc);
    color: var(--sky-700, #0369a1);
}
.pagination__btn.active {
    background: var(--sky-500, #0ea5e9);
    border-color: var(--sky-500, #0ea5e9);
    color: #fff;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}
.pagination__btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.pagination__num {
    min-width: 40px;
    padding: 0 8px;
}

.pagination__prev,
.pagination__next {
    padding: 0 16px;
}
.pagination__prev i,
.pagination__next i {
    font-size: 0.72rem;
}

.pagination__ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--slate-400, #94a3b8);
    font-size: 0.88rem;
    font-weight: 700;
    user-select: none;
}

.pagination__info {
    width: 100%;
    text-align: center;
    margin-top: 8px;
    font-size: 0.82rem;
    color: var(--slate-400, #94a3b8);
}

/* ═══════ RESPONSIVE ═══════ */

/* Tablet: Narrower sidebar */
@media (max-width: 1100px) {
    .browse__layout {
        grid-template-columns: 250px 1fr;
        gap: 20px;
    }
    .browse__grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
        gap: 18px;
    }
}

/* Mobile: Collapsible filter panel */
@media (max-width: 900px) {
    .filter-toggle {
        display: inline-flex;
    }

    .browse__layout {
        grid-template-columns: 1fr;
    }

    .filter-panel {
        position: fixed;
        top: 0;
        left: -100%;
        width: 85%;
        max-width: 340px;
        height: 100vh;
        max-height: 100vh;
        z-index: 1000;
        border-radius: 0 var(--radius-lg, 24px) var(--radius-lg, 24px) 0;
        transition: left 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: none;
    }
    .filter-panel.open {
        left: 0;
        box-shadow: 0 0 80px rgba(0, 0, 0, 0.2);
    }

    /* Overlay behind filter panel */
    .filter-panel.open::before {
        content: '';
        position: fixed;
        inset: 0;
        left: 100%;
        width: 100vw;
        background: rgba(0, 0, 0, 0.3);
        z-index: -1;
    }

    .browse__grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }

    .pagination__prev,
    .pagination__next {
        padding: 0 10px;
        font-size: 0.82rem;
    }
}

@media (max-width: 600px) {
    .browse__toolbar {
        padding: 12px 16px;
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }
    .browse__grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .course-card__thumb {
        height: 170px;
    }
    .filter-panel {
        width: 90%;
        max-width: 320px;
        padding: 20px;
    }

    .pagination {
        gap: 4px;
        margin-top: 28px;
    }
    .pagination__btn {
        min-width: 36px;
        height: 36px;
        padding: 0 10px;
        font-size: 0.82rem;
    }
    .pagination__ellipsis {
        width: 30px;
    }

    .browse__per-page {
        display: none;
    }
}