/* ===================================
   Course Display - Modern Responsive Styles
   =================================== */

:root {
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #818cf8;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;

    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;

    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;

    --border-color: #e5e7eb;
    --border-radius: 12px;
    --border-radius-sm: 8px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background: var(--bg-secondary);
    line-height: 1.6;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===================================
   Search & Filter Bar
   =================================== */

.search-filter-section {
    background: var(--bg-primary);
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.search-filter-wrapper {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

/* Filter Toggle Button */
.filter-toggle-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.filter-toggle-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.filter-count {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--danger-color);
    color: white;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
}

/* Search Bar */
.search-bar-wrapper {
    flex: 1;
    position: relative;
    min-width: 250px;
}

.search-input {
    width: 100%;
    padding: 12px 50px 12px 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 15px;
    transition: var(--transition);
    background: var(--bg-secondary);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.search-btn,
.clear-search-btn {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    padding: 8px 12px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    border-radius: var(--border-radius-sm);
}

.search-btn:hover,
.clear-search-btn:hover {
    color: var(--primary-color);
    background: var(--bg-tertiary);
}

.clear-search-btn {
    right: 45px;
}

/* Search Suggestions */
.search-suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    margin-top: 4px;
    max-height: 400px;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 1000;
}

.search-suggestions.show {
    display: block;
}

.suggestion-item {
    padding: 12px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: var(--transition);
    border-bottom: 1px solid var(--bg-tertiary);
}

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

.suggestion-item:hover {
    background: var(--bg-secondary);
}

.suggestion-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    color: var(--primary-color);
}

/* Sort Dropdown */
.sort-dropdown-wrapper {
    position: relative;
}

.sort-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.sort-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.sort-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    min-width: 200px;
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 1000;
}

.sort-dropdown.show {
    display: block;
}

.sort-option {
    padding: 12px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
    border-bottom: 1px solid var(--bg-tertiary);
}

.sort-option:last-child {
    border-bottom: none;
}

.sort-option:hover {
    background: var(--bg-secondary);
}

.sort-option i.fa-check {
    opacity: 0;
    color: var(--primary-color);
}

.sort-option.active i.fa-check {
    opacity: 1;
}

/* Active Filters */
.active-filters {
    margin-top: 16px;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.active-filters-label {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-secondary);
}

.active-filter-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    flex: 1;
}

.filter-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.filter-tag-remove {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.filter-tag-remove:hover {
    background: var(--bg-tertiary);
    color: var(--danger-color);
}

.clear-all-filters-btn {
    padding: 6px 16px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.clear-all-filters-btn:hover {
    background: #dc2626;
}

/* ===================================
   Content Section
   =================================== */

.content-section {
    padding: 32px 0;
}

.content-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 32px;
}

/* ===================================
   Filter Sidebar
   =================================== */
/*
.filter-sidebar {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 24px;
    height: fit-content;
    position: sticky;
    top: 120px;
    box-shadow: var(--shadow-sm);
}
*/
.filter-sidebar {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 24px;
    height: fit-content;
    position: sticky;
    top: 120px;
    box-shadow: var(--shadow-sm);
    max-height: calc(100vh - 160px); /* Adjust based on your header */
    overflow-y: auto;
}
.filter-sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--bg-tertiary);
}

.filter-sidebar-header h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.close-sidebar-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.close-sidebar-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Filter Sections */
.filter-section {
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--bg-tertiary);
}

.filter-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.filter-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    padding: 8px 0;
    user-select: none;
}

.filter-section-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.filter-section-toggle {
    color: var(--text-secondary);
    transition: var(--transition);
}

.filter-section.collapsed .filter-section-toggle {
    transform: rotate(-90deg);
}

.filter-options {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 300px;
    overflow-y: auto;
}

.filter-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.filter-option:hover {
    background: var(--bg-secondary);
}

.filter-option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.filter-option-label {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
    cursor: pointer;
}

.filter-option-count {
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: 10px;
}

/* ===================================
   Course Grid
   =================================== */

.course-grid-wrapper {
    min-width: 0;
}

.results-info {
    margin-bottom: 24px;
    font-size: 15px;
    color: var(--text-secondary);
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

/* Course Card */
.course-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Course Image */
.course-image {
    position: relative;
    padding-top: 56.25%; /* 16:9 aspect ratio */
    overflow: hidden;
    background: var(--bg-tertiary);
}

.course-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.course-card:hover .course-image img {
    transform: scale(1.05);
}

.course-badges {
    position: absolute;
    top: 12px;
    left: 12px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    z-index: 10;
}

.badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-sm);
}

.badge-tag {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.badge-type {
    background: var(--warning-color);
    color: white;
}

.quick-view-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transform: scale(0.8);
    transition: var(--transition);
    color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.course-card:hover .quick-view-btn {
    opacity: 1;
    transform: scale(1);
}

.quick-view-btn:hover {
    background: white;
    transform: scale(1.1);
}

/* Course Info */
.course-info {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex: 1;
}

.course-title {
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
}

.course-title:hover {
    color: var(--primary-color);
}

.course-title h3 {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-author {
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.course-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.rating {
    display: flex;
    align-items: center;
    gap: 6px;
}

.rating-value {
    font-weight: 700;
    font-size: 16px;
    color: var(--text-primary);
}

.stars {
    display: flex;
    gap: 2px;
    color: var(--warning-color);
}

.rating-count {
    font-size: 13px;
    color: var(--text-secondary);
}

.course-details-mini {
    display: flex;
    gap: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}

.course-details-mini span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.course-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Course Footer */
.course-footer {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--bg-tertiary);
}

.price-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.current-price {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.original-price {
    font-size: 16px;
    color: var(--text-light);
    text-decoration: line-through;
}

.discount-badge {
    padding: 4px 8px;
    background: var(--danger-color);
    color: white;
    border-radius: var(--border-radius-sm);
    font-size: 12px;
    font-weight: 600;
}

.course-actions {
    display: flex;
    gap: 8px;
}

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    flex: 1;
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

/* No Results */
.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
}

.no-results i {
    font-size: 64px;
    color: var(--text-light);
    margin-bottom: 20px;
}

.no-results h3 {
    font-size: 24px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.no-results p {
    color: var(--text-secondary);
}

/* Pagination */
.pagination-wrapper {
    margin-top: 40px;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.pagination-btn,
.pagination-number {
    padding: 10px 16px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.pagination-btn:hover,
.pagination-number:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination-number.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* ===================================
   Quick View Modal
   =================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: white;
    border-radius: var(--border-radius);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    background: white;
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    z-index: 10;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-tertiary);
    transform: rotate(90deg);
}

.modal-body {
    padding: 40px;
}

/* ===================================
   Responsive Design
   =================================== */

/* Tablet */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
    }

    .filter-sidebar {
        display: none;
    }

    .filter-sidebar.mobile-open {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 320px;
        max-width: 85vw;
        z-index: 1000;
        overflow-y: auto;
        animation: slideIn 0.3s ease;
    }

    @keyframes slideIn {
        from {
            transform: translateX(-100%);
        }
        to {
            transform: translateX(0);
        }
    }

    .close-sidebar-btn {
        display: block;
    }

    .course-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

/* Mobile */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .search-filter-wrapper {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-toggle-btn,
    .sort-btn {
        width: 100%;
        justify-content: center;
    }

    .search-bar-wrapper {
        width: 100%;
        min-width: auto;
    }

    .content-section {
        padding: 20px 0;
    }

    .course-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .course-card {
        max-width: 100%;
    }

    .modal-body {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .search-filter-section {
        padding: 12px 0;
    }

    .current-price {
        font-size: 20px;
    }

    .course-actions {
        flex-direction: column;
    }

    .btn-secondary {
        width: 100%;
    }
}