/* ==========================================
   COURSES - Listing, Detail, Player Pages
   ========================================== */

/* ---------- Hero Section ---------- */
.courses-hero {
    position: relative;
    background: linear-gradient(135deg, #7C3AED 0%, #5B21B6 50%, #4C1D95 100%);
    padding: 80px 0 60px;
    text-align: center;
    overflow: hidden;
}

.courses-hero-bg {
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 20px,
        rgba(255,255,255,0.03) 20px,
        rgba(255,255,255,0.03) 40px
    );
    pointer-events: none;
}

.courses-hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.courses-hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.85);
    max-width: 600px;
    margin: 0 auto 24px;
    position: relative;
    z-index: 1;
}

/* ---------- Course Listing Grid ---------- */
.courses-content {
    padding: 48px 0 80px;
    background: var(--off-white);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-top: 24px;
}

/* ---------- Course Card ---------- */
.course-card {
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(124, 58, 237, 0.12);
    border-color: var(--primary-purple-light);
}

.course-card-thumbnail {
    position: relative;
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, #7C3AED, #5B21B6);
    overflow: hidden;
}

.course-card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.course-card-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.7);
    font-size: 2.5rem;
}

.course-card-level {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-card-level.level-beginner { background: #D1FAE5; color: #065F46; }
.course-card-level.level-intermediate { background: #DBEAFE; color: #1E40AF; }
.course-card-level.level-advanced { background: #FEE2E2; color: #991B1B; }

.course-card-domain {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    background: rgba(0,0,0,0.5);
    color: #fff;
    backdrop-filter: blur(4px);
}

.course-card-content {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-card-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-card-title a {
    color: inherit;
    text-decoration: none;
}

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

.course-card-instructor {
    font-size: 0.85rem;
    color: var(--text-gray);
    margin-bottom: 12px;
}

.course-card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--text-gray);
    margin-top: auto;
    padding-top: 12px;
}

.course-card-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.course-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    border-top: 1px solid var(--border-color);
    background: var(--off-white);
}

.course-card-price {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-purple);
}

.course-card-credits {
    font-size: 0.75rem;
    color: var(--text-gray);
}

.course-card-link {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-purple);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.course-card-link:hover {
    gap: 8px;
}

/* ---------- Course Detail Page ---------- */
.course-detail-hero {
    background: linear-gradient(135deg, #7C3AED 0%, #5B21B6 50%, #4C1D95 100%);
    padding: 80px 0 48px;
    color: #fff;
}

.course-detail-hero .container {
    max-width: 1100px;
}

.course-detail-breadcrumb {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 20px;
}

.course-detail-breadcrumb a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
}

.course-detail-breadcrumb a:hover {
    color: #fff;
}

.course-detail-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.25;
}

.course-detail-short-desc {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.9);
    max-width: 700px;
    line-height: 1.6;
    margin-bottom: 20px;
}

.course-detail-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.course-detail-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: rgba(255,255,255,0.15);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: #fff;
    backdrop-filter: blur(4px);
}

/* ---------- Detail Two-Column Layout ---------- */
.course-detail-content {
    padding: 40px 0 80px;
    background: var(--off-white);
}

.course-detail-content .container {
    max-width: 1100px;
}

.course-detail-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 32px;
    align-items: start;
}

/* Left column */
.course-detail-main {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.course-detail-section {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 28px;
    border: 1px solid var(--border-color);
}

.course-detail-section h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.course-detail-description {
    line-height: 1.7;
    color: var(--text-dark);
}

.course-detail-description p {
    margin-bottom: 16px;
}

.course-detail-description p:last-child {
    margin-bottom: 0;
}

/* What You'll Learn */
.course-learn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.course-learn-item {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    font-size: 0.9rem;
    color: var(--text-dark);
    line-height: 1.5;
}

.course-learn-check {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    background: #D1FAE5;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 2px;
}

.course-learn-check svg {
    width: 12px;
    height: 12px;
    stroke: #065F46;
}

/* Curriculum accordion */
.course-curriculum-section {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 8px;
    overflow: hidden;
}

.course-curriculum-section:last-child {
    margin-bottom: 0;
}

.course-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background: var(--off-white);
    cursor: pointer;
    border: none;
    width: 100%;
    text-align: left;
    font-family: inherit;
    transition: var(--transition);
}

.course-section-header:hover {
    background: #F3F4F6;
}

.course-section-header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.course-section-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-dark);
}

.course-section-meta {
    font-size: 0.8rem;
    color: var(--text-gray);
}

.course-section-chevron {
    transition: transform 0.2s ease;
    color: var(--text-gray);
}

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

.course-section-lectures {
    display: none;
    border-top: 1px solid var(--border-color);
}

.course-curriculum-section.expanded .course-section-lectures {
    display: block;
}

.course-lecture-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 18px 12px 48px;
    border-bottom: 1px solid #F3F4F6;
    font-size: 0.88rem;
    color: var(--text-dark);
    transition: var(--transition);
}

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

.course-lecture-item:hover {
    background: #FAFAFA;
}

.course-lecture-left {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
}

.course-lecture-icon {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    color: var(--text-gray);
}

.course-lecture-icon.preview {
    color: var(--primary-purple);
}

.course-lecture-title-text {
    line-height: 1.4;
}

.course-lecture-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.course-lecture-duration {
    font-size: 0.8rem;
    color: var(--text-gray);
}

.course-lecture-preview-badge {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--primary-purple);
    padding: 2px 8px;
    border: 1px solid var(--primary-purple-light);
    border-radius: var(--radius-full);
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
}

.course-lecture-preview-badge:hover {
    background: var(--primary-purple);
    color: #fff;
}

.course-lecture-lock {
    color: var(--text-light);
}

/* Right sidebar — Enroll Card */
.course-enroll-card {
    position: sticky;
    top: 100px;
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.course-enroll-thumbnail {
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, #7C3AED, #5B21B6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.7);
    font-size: 3rem;
    position: relative;
    overflow: hidden;
}

.course-enroll-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.course-enroll-body {
    padding: 24px;
}

.course-enroll-price {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.course-enroll-credits {
    font-size: 0.85rem;
    color: var(--text-gray);
    margin-bottom: 20px;
}

.course-enroll-btn {
    display: block;
    width: 100%;
    padding: 14px;
    background: var(--primary-purple);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    text-decoration: none;
}

.course-enroll-btn:hover {
    background: var(--primary-purple-dark);
}

.course-enroll-btn.enrolled {
    background: #059669;
}

.course-enroll-btn.enrolled:hover {
    background: #047857;
}

.course-enroll-includes {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.course-enroll-includes h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.course-enroll-include-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    color: var(--text-gray);
    padding: 6px 0;
}

.course-enroll-include-item svg {
    flex-shrink: 0;
    color: var(--primary-purple);
}

/* ---------- Student Reviews ---------- */
.course-reviews-summary {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.course-reviews-avg {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-dark);
    line-height: 1;
}

.course-reviews-stars {
    display: flex;
    align-items: center;
    gap: 2px;
}

.course-reviews-count {
    font-size: 0.9rem;
    color: var(--text-gray);
}

.course-reviews-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.course-review-card {
    padding: 20px;
    background: var(--off-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.course-review-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 12px;
}

.course-review-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.course-review-meta {
    flex: 1;
}

.course-review-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.course-review-rating-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.course-review-stars {
    display: flex;
    align-items: center;
    gap: 1px;
}

.course-review-date {
    font-size: 0.8rem;
    color: var(--text-gray);
}

.course-review-text {
    font-size: 0.9rem;
    color: var(--text-dark);
    line-height: 1.65;
    margin: 0;
}

/* ---------- Course Player Page ---------- */
.course-player {
    min-height: 100vh;
    background: var(--off-white);
}

.course-player-header {
    background: #1F2937;
    padding: 0;
    color: #fff;
}

.course-player-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1400px;
    height: 48px;
}

.course-player-back {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-size: 0.85rem;
    line-height: 1;
    transition: var(--transition);
    flex-shrink: 0;
}

.course-player-back:hover {
    color: #fff;
}

.course-player-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: #fff;
    text-align: center;
    flex: 1;
    padding: 0 20px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1;
}

.course-player-progress-text {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.7);
    white-space: nowrap;
    flex-shrink: 0;
    line-height: 1;
}

/* Player Grid */
.course-player-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    max-width: 1400px;
    margin: 0 auto;
    min-height: calc(100vh - 120px);
}

/* Video Area */
.course-player-video-area {
    background: #000;
    display: flex;
    flex-direction: column;
}

.course-player-video-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
}

.course-player-video-container video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.course-player-video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.5);
    gap: 12px;
    font-size: 0.95rem;
}

.course-player-video-placeholder svg {
    width: 48px;
    height: 48px;
}

.course-player-lecture-info {
    padding: 24px 28px;
    background: #fff;
    border-bottom: 1px solid var(--border-color);
}

.course-player-lecture-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.course-player-lecture-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.course-player-complete-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--primary-purple);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.course-player-complete-btn:hover {
    background: var(--primary-purple-dark);
}

.course-player-complete-btn.completed {
    background: #059669;
    cursor: default;
}

.course-player-next-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: transparent;
    color: var(--primary-purple);
    border: 1px solid var(--primary-purple);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.course-player-next-btn:hover {
    background: var(--primary-purple);
    color: #fff;
}

/* Sidebar */
.course-player-sidebar {
    background: #fff;
    border-left: 1px solid var(--border-color);
    overflow-y: auto;
    max-height: calc(100vh - 56px);
}

.course-player-sidebar-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: #fff;
    z-index: 5;
}

.course-player-sidebar-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.course-player-progress-bar-container {
    background: #E5E7EB;
    border-radius: var(--radius-full);
    height: 6px;
    overflow: hidden;
    margin-bottom: 6px;
}

.course-player-progress-bar {
    height: 100%;
    background: var(--primary-purple);
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

.course-player-progress-label {
    font-size: 0.8rem;
    color: var(--text-gray);
}

/* Sidebar Sections */
.player-section {
    border-bottom: 1px solid var(--border-color);
}

.player-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    cursor: pointer;
    background: var(--off-white);
    border: none;
    width: 100%;
    text-align: left;
    font-family: inherit;
    transition: var(--transition);
}

.player-section-header:hover {
    background: #F3F4F6;
}

.player-section-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-dark);
}

.player-section-info {
    font-size: 0.75rem;
    color: var(--text-gray);
}

.player-section-chevron {
    transition: transform 0.2s ease;
    color: var(--text-gray);
}

.player-section.expanded .player-section-chevron {
    transform: rotate(180deg);
}

.player-section-lectures {
    display: none;
}

.player-section.expanded .player-section-lectures {
    display: block;
}

.player-lecture-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px 10px 36px;
    cursor: pointer;
    border-bottom: 1px solid #F9FAFB;
    transition: var(--transition);
    font-size: 0.85rem;
    color: var(--text-dark);
}

.player-lecture-item:hover {
    background: #F9FAFB;
}

.player-lecture-item.active {
    background: #EDE9FE;
    border-left: 3px solid var(--primary-purple);
    padding-left: 33px;
}

.player-lecture-item.completed .player-lecture-status {
    color: #059669;
}

.player-lecture-status {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
}

.player-lecture-info {
    flex: 1;
    min-width: 0;
}

.player-lecture-name {
    font-size: 0.83rem;
    line-height: 1.4;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.player-lecture-dur {
    font-size: 0.75rem;
    color: var(--text-gray);
    margin-top: 2px;
}

/* ---------- Loading / Empty States ---------- */
.courses-loading {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-gray);
    font-size: 1rem;
}

.courses-empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-gray);
}

.courses-empty h3 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 8px;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .course-detail-grid {
        grid-template-columns: 1fr;
    }

    .course-enroll-card {
        position: static;
        order: -1;
    }

    .course-player-grid {
        grid-template-columns: 1fr;
    }

    .course-player-sidebar {
        border-left: none;
        border-top: 1px solid var(--border-color);
        max-height: none;
    }
}

@media (max-width: 768px) {
    .courses-hero-title {
        font-size: 1.8rem;
    }

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

    .course-detail-title {
        font-size: 1.6rem;
    }

    .course-detail-pills {
        gap: 8px;
    }

    .course-learn-grid {
        grid-template-columns: 1fr;
    }

    .course-lecture-item {
        padding-left: 28px;
    }

    .course-player-header .container {
        flex-wrap: wrap;
        gap: 8px;
    }

    .course-player-title {
        order: 3;
        flex-basis: 100%;
        text-align: left;
        padding: 0;
    }
}