/**
 * BTC University - Courses Page Styles
 * Course catalog, filtering, and detail views
 * 
 * Features:
 * - Course cards grid
 * - Filter sidebar
 * - Course detail modal/page
 * - Progress indicators
 * - Enrollment buttons
 */

/* ============================================
   COURSES PAGE LAYOUT
============================================ */

.courses-page {
    display: flex;
    gap: var(--space-8);
    padding: var(--space-8) 0;
}

/* ============================================
   FILTER SIDEBAR
============================================ */

.courses-filters {
    width: 16rem;
    flex-shrink: 0;
    position: sticky;
    top: calc(var(--header-height) + var(--space-8));
    height: fit-content;
}

.filter-section {
    margin-bottom: var(--space-6);
}

.filter-section-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    margin-bottom: var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.filter-section-title svg {
    width: 1rem;
    height: 1rem;
    color: var(--btcu-gray-500);
}

/* Search Input */
.filter-search {
    position: relative;
    margin-bottom: var(--space-6);
}

.filter-search-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    padding-left: 2.5rem;
    background: var(--btcu-white);
    border: 1px solid var(--btcu-gray-200);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    color: var(--btcu-navy);
    transition: all var(--transition-fast);
}

.filter-search-input:focus {
    outline: none;
    border-color: var(--btcu-gold);
    box-shadow: 0 0 0 3px rgba(201, 184, 150, 0.2);
}

.filter-search-icon {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    width: 1.25rem;
    height: 1.25rem;
    color: var(--btcu-gray-400);
    pointer-events: none;
}

/* Filter Options */
.filter-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.filter-option {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.filter-option:hover {
    background: var(--btcu-gray-100);
}

.filter-checkbox {
    width: 1.125rem;
    height: 1.125rem;
    border: 2px solid var(--btcu-gray-300);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.filter-option.active .filter-checkbox {
    background: var(--btcu-orange);
    border-color: var(--btcu-orange);
}

.filter-checkbox svg {
    width: 0.75rem;
    height: 0.75rem;
    color: var(--btcu-white);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.filter-option.active .filter-checkbox svg {
    opacity: 1;
}

.filter-label {
    font-size: var(--text-sm);
    color: var(--btcu-gray-600);
    flex: 1;
}

.filter-count {
    font-size: var(--text-xs);
    color: var(--btcu-gray-400);
    background: var(--btcu-gray-100);
    padding: var(--space-0) var(--space-2);
    border-radius: var(--radius-full);
}

/* Clear Filters Button */
.filter-clear {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-2) var(--space-3);
    background: transparent;
    border: 1px solid var(--btcu-gray-200);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--btcu-gray-500);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-clear:hover {
    background: var(--btcu-gray-100);
    color: var(--btcu-navy);
}

.filter-clear svg {
    width: 1rem;
    height: 1rem;
}

/* ============================================
   COURSES MAIN CONTENT
============================================ */

.courses-main {
    flex: 1;
    min-width: 0;
}

/* Courses Header */
.courses-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.courses-count {
    font-size: var(--text-lg);
    color: var(--btcu-gray-600);
}

.courses-count strong {
    color: var(--btcu-navy);
}

.courses-sort {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.courses-sort-label {
    font-size: var(--text-sm);
    color: var(--btcu-gray-500);
}

.courses-sort-select {
    padding: var(--space-2) var(--space-3);
    padding-right: var(--space-8);
    background: var(--btcu-white);
    border: 1px solid var(--btcu-gray-200);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--btcu-navy);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B6B63' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
}

.courses-sort-select:focus {
    outline: none;
    border-color: var(--btcu-gold);
}

/* View Toggle */
.courses-view-toggle {
    display: flex;
    gap: var(--space-1);
    padding: var(--space-1);
    background: var(--btcu-gray-100);
    border-radius: var(--radius-md);
}

.courses-view-btn {
    padding: var(--space-2);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--btcu-gray-500);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.courses-view-btn:hover {
    color: var(--btcu-navy);
}

.courses-view-btn.active {
    background: var(--btcu-white);
    color: var(--btcu-navy);
    box-shadow: var(--shadow-sm);
}

.courses-view-btn svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* ============================================
   COURSES GRID
============================================ */

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(20rem, 1fr));
    gap: var(--space-6);
}

.courses-grid.list-view {
    grid-template-columns: 1fr;
}

/* ============================================
   COURSE CARD
============================================ */

.course-card {
    background: var(--btcu-white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--btcu-gray-200);
    transition: all var(--transition-default);
    display: flex;
    flex-direction: column;
}

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

/* List view styling */
.courses-grid.list-view .course-card {
    flex-direction: row;
}

.courses-grid.list-view .course-card-thumbnail {
    width: 12rem;
    flex-shrink: 0;
}

.courses-grid.list-view .course-card-body {
    flex: 1;
}

/* Course Thumbnail */
.course-card-thumbnail {
    position: relative;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, var(--btcu-navy) 0%, var(--btcu-navy-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.course-card-thumbnail-icon {
    width: 4rem;
    height: 4rem;
    color: var(--btcu-gold);
    opacity: 0.5;
}

.course-card-badge {
    position: absolute;
    top: var(--space-3);
    left: var(--space-3);
    padding: var(--space-1) var(--space-3);
    background: var(--btcu-orange);
    color: var(--btcu-white);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
}

.course-card-badge.year-1 { background: var(--btcu-info); }
.course-card-badge.year-2 { background: var(--btcu-success); }
.course-card-badge.year-3 { background: var(--btcu-warning); }
.course-card-badge.year-4 { background: var(--btcu-orange); }

.course-card-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: rgba(0, 0, 0, 0.3);
}

.course-card-progress-bar {
    height: 100%;
    background: var(--btcu-gold);
    transition: width var(--transition-slow);
}

/* Course Body */
.course-card-body {
    padding: var(--space-5);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-card-code {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--btcu-gold-dark);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    margin-bottom: var(--space-1);
}

.course-card-title {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    margin-bottom: var(--space-2);
    line-height: var(--leading-snug);
}

.course-card-description {
    font-size: var(--text-sm);
    color: var(--btcu-gray-500);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-4);
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Course Meta */
.course-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--btcu-gray-100);
}

.course-card-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-xs);
    color: var(--btcu-gray-500);
}

.course-card-meta-item svg {
    width: 1rem;
    height: 1rem;
}

/* Course Footer */
.course-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.course-card-instructor {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.course-card-instructor-avatar {
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--btcu-gold), var(--btcu-orange));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
}

.course-card-instructor-name {
    font-size: var(--text-sm);
    color: var(--btcu-gray-600);
}

.course-card-action {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

/* ============================================
   COURSE DETAIL PAGE
============================================ */

.course-detail {
    max-width: var(--container-6xl);
    margin: 0 auto;
    padding: var(--space-8) var(--space-6);
}

.course-detail-header {
    display: flex;
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.course-detail-thumbnail {
    width: 24rem;
    flex-shrink: 0;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, var(--btcu-navy) 0%, var(--btcu-navy-light) 100%);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-detail-thumbnail svg {
    width: 6rem;
    height: 6rem;
    color: var(--btcu-gold);
    opacity: 0.5;
}

.course-detail-info {
    flex: 1;
}

.course-detail-badge {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    background: var(--btcu-gold-light);
    color: var(--btcu-navy);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-3);
}

.course-detail-title {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-3);
}

.course-detail-description {
    font-size: var(--text-lg);
    color: var(--btcu-gray-600);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-6);
}

.course-detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
}

.course-detail-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--btcu-gray-600);
}

.course-detail-meta-item svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--btcu-gold);
}

.course-detail-actions {
    display: flex;
    gap: var(--space-4);
}

/* Course Content Sections */
.course-detail-content {
    display: grid;
    grid-template-columns: 1fr 20rem;
    gap: var(--space-8);
}

.course-detail-main {
    min-width: 0;
}

.course-detail-sidebar {
    position: sticky;
    top: calc(var(--header-height) + var(--space-8));
    height: fit-content;
}

/* Course Modules/Chapters */
.course-modules {
    background: var(--btcu-white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--btcu-gray-200);
    overflow: hidden;
}

.course-modules-header {
    padding: var(--space-5);
    border-bottom: 1px solid var(--btcu-gray-200);
}

.course-modules-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    margin-bottom: var(--space-1);
}

.course-modules-subtitle {
    font-size: var(--text-sm);
    color: var(--btcu-gray-500);
}

.course-module {
    border-bottom: 1px solid var(--btcu-gray-100);
}

.course-module:last-child {
    border-bottom: none;
}

.course-module-header {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-5);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.course-module-header:hover {
    background: var(--btcu-gray-50);
}

.course-module-number {
    width: 2rem;
    height: 2rem;
    background: var(--btcu-gold-light);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    flex-shrink: 0;
}

.course-module-info {
    flex: 1;
}

.course-module-title {
    font-weight: var(--font-medium);
    color: var(--btcu-navy);
    margin-bottom: var(--space-1);
}

.course-module-meta {
    font-size: var(--text-xs);
    color: var(--btcu-gray-500);
}

.course-module-chevron {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--btcu-gray-400);
    transition: transform var(--transition-fast);
}

.course-module.expanded .course-module-chevron {
    transform: rotate(180deg);
}

.course-module-lessons {
    display: none;
    padding: 0 var(--space-5) var(--space-4);
}

.course-module.expanded .course-module-lessons {
    display: block;
}

.course-lesson {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    margin-left: var(--space-8);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.course-lesson:hover {
    background: var(--btcu-gray-100);
}

.course-lesson-icon {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--btcu-gray-400);
}

.course-lesson.completed .course-lesson-icon {
    color: var(--btcu-success);
}

.course-lesson-title {
    flex: 1;
    font-size: var(--text-sm);
    color: var(--btcu-gray-600);
}

.course-lesson-duration {
    font-size: var(--text-xs);
    color: var(--btcu-gray-400);
}

/* ============================================
   ENROLLMENT CARD
============================================ */

.enrollment-card {
    background: var(--btcu-white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--btcu-gray-200);
    padding: var(--space-6);
}

.enrollment-card-price {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--btcu-navy);
    margin-bottom: var(--space-4);
}

.enrollment-card-price span {
    font-size: var(--text-base);
    font-weight: var(--font-regular);
    color: var(--btcu-gray-500);
}

.enrollment-card-btn {
    width: 100%;
    margin-bottom: var(--space-4);
}

.enrollment-card-features {
    list-style: none;
    margin: 0;
    padding: 0;
}

.enrollment-card-feature {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) 0;
    font-size: var(--text-sm);
    color: var(--btcu-gray-600);
}

.enrollment-card-feature svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--btcu-success);
    flex-shrink: 0;
}

/* ============================================
   RESPONSIVE STYLES
============================================ */

@media (max-width: 1024px) {
    .courses-page {
        flex-direction: column;
    }
    
    .courses-filters {
        width: 100%;
        position: static;
        display: flex;
        flex-wrap: wrap;
        gap: var(--space-4);
    }
    
    .filter-section {
        flex: 1;
        min-width: 12rem;
        margin-bottom: 0;
    }
    
    .course-detail-header {
        flex-direction: column;
    }
    
    .course-detail-thumbnail {
        width: 100%;
    }
    
    .course-detail-content {
        grid-template-columns: 1fr;
    }
    
    .course-detail-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .courses-grid.list-view .course-card {
        flex-direction: column;
    }
    
    .courses-grid.list-view .course-card-thumbnail {
        width: 100%;
    }
    
    .courses-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .courses-sort {
        flex-wrap: wrap;
    }
}