/**
 * GlobalStudyLab - Featured Content Carousel Styles
 * Responsive, accessible, touch-friendly carousel with smooth animations
 * Version: 1.0 | Date: November 2, 2025
 *
 * @package    local_gsl_core
 * @copyright  2025 GlobalStudyLab
 */

/* ============================================
   SECTION CONTAINER
   ============================================ */
.gsl-featured-carousel {
    position: relative;
    width: 100%;
    background: linear-gradient(180deg, #f9fafb 0%, #ffffff 100%);
    padding: 80px 0;
    overflow: hidden;
}

.gsl-carousel-container {
    position: relative;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================
   SECTION HEADER
   ============================================ */
.gsl-carousel-header {
    text-align: center;
    margin-bottom: 56px;
    animation: fadeInUp 0.8s ease-out both;
}

.gsl-carousel-heading {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 800;
    line-height: 1.2;
    color: #1f2937;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #0EA5E9 0%, #06B6D4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gsl-carousel-subheading {
    font-size: clamp(16px, 2.5vw, 20px);
    color: #6b7280;
    font-weight: 500;
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   CAROUSEL WRAPPER
   ============================================ */
.gsl-carousel-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
}

/* ============================================
   CAROUSEL TRACK CONTAINER
   ============================================ */
.gsl-carousel-track-container {
    flex: 1;
    overflow: hidden;
    position: relative;
    padding: 8px 0;
}

.gsl-carousel-track {
    display: flex;
    gap: 24px;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
}

.gsl-carousel-track.is-transitioning {
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.gsl-carousel-track.no-transition {
    transition: none;
}

/* ============================================
   COURSE CARD
   ============================================ */
.gsl-course-card {
    flex: 0 0 calc(25% - 18px);
    min-width: 280px;
    background: #ffffff;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
}

.gsl-course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
}

.gsl-course-card:focus-within {
    outline: 3px solid #0EA5E9;
    outline-offset: 2px;
}

/* ============================================
   COURSE THUMBNAIL
   ============================================ */
.gsl-course-thumbnail {
    position: relative;
    width: 100%;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.gsl-course-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.gsl-course-card:hover .gsl-course-overlay {
    opacity: 1;
}

.gsl-play-icon {
    transform: scale(0.8);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.gsl-course-card:hover .gsl-play-icon {
    transform: scale(1);
}

/* Category Badge */
.gsl-course-category-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    color: #ffffff;
    background-color: #0EA5E9;
    z-index: 2;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* ============================================
   COURSE INFO
   ============================================ */
.gsl-course-info {
    padding: 20px;
}

.gsl-course-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    color: #1f2937;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    min-height: 50px;
}

.gsl-course-instructor {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: #6b7280;
    margin-bottom: 12px;
}

.gsl-instructor-icon {
    color: #9ca3af;
}

/* ============================================
   COURSE META (RATING & STUDENTS)
   ============================================ */
.gsl-course-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid #e5e7eb;
}

.gsl-course-rating {
    display: flex;
    align-items: center;
    gap: 4px;
}

.gsl-star {
    width: 16px;
    height: 16px;
}

.gsl-rating-value {
    margin-left: 4px;
    font-size: 14px;
    font-weight: 600;
    color: #1f2937;
}

.gsl-course-students {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    color: #6b7280;
}

.gsl-students-icon {
    color: #9ca3af;
}

/* ============================================
   COURSE FOOTER (PRICE & CTA)
   ============================================ */
.gsl-course-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.gsl-course-price {
    flex: 1;
}

.gsl-price-amount {
    font-size: 24px;
    font-weight: 800;
    color: #0EA5E9;
}

.gsl-price-free {
    font-size: 20px;
    font-weight: 700;
    color: #10B981;
}

.gsl-enroll-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: linear-gradient(135deg, #0EA5E9 0%, #06B6D4 100%);
    color: #ffffff;
    font-size: 14px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.gsl-enroll-btn:hover {
    background: linear-gradient(135deg, #0284c7 0%, #0891b2 100%);
    transform: translateX(2px);
}

.gsl-enroll-btn:focus {
    outline: 2px solid #0EA5E9;
    outline-offset: 2px;
}

.gsl-arrow-icon {
    transition: transform 0.3s ease;
}

.gsl-enroll-btn:hover .gsl-arrow-icon {
    transform: translateX(4px);
}

/* ============================================
   NAVIGATION ARROWS
   ============================================ */
.gsl-carousel-nav {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: #ffffff;
    border: 2px solid #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #6b7280;
    z-index: 10;
}

.gsl-carousel-nav:hover {
    background: #0EA5E9;
    border-color: #0EA5E9;
    color: #ffffff;
    transform: scale(1.1);
}

.gsl-carousel-nav:focus {
    outline: 3px solid #0EA5E9;
    outline-offset: 2px;
}

.gsl-carousel-nav:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: #f3f4f6;
}

.gsl-carousel-nav:disabled:hover {
    transform: none;
    background: #f3f4f6;
    border-color: #e5e7eb;
    color: #6b7280;
}

/* ============================================
   CAROUSEL INDICATORS (DOTS)
   ============================================ */
.gsl-carousel-indicators {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 32px;
}

.gsl-carousel-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #d1d5db;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 0;
}

.gsl-carousel-indicator:hover {
    background: #9ca3af;
    transform: scale(1.2);
}

.gsl-carousel-indicator.active {
    background: #0EA5E9;
    width: 32px;
    border-radius: 6px;
}

.gsl-carousel-indicator:focus {
    outline: 2px solid #0EA5E9;
    outline-offset: 2px;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet (3 cards) */
@media (max-width: 1200px) {
    .gsl-course-card {
        flex: 0 0 calc(33.333% - 16px);
    }
}

/* Tablet (2 cards) */
@media (max-width: 900px) {
    .gsl-featured-carousel {
        padding: 60px 0;
    }

    .gsl-carousel-header {
        margin-bottom: 40px;
    }

    .gsl-course-card {
        flex: 0 0 calc(50% - 12px);
        min-width: 260px;
    }

    .gsl-carousel-nav {
        width: 40px;
        height: 40px;
    }

    .gsl-carousel-wrapper {
        gap: 12px;
    }

    .gsl-carousel-track {
        gap: 16px;
    }
}

/* Mobile (1 card) */
@media (max-width: 640px) {
    .gsl-featured-carousel {
        padding: 48px 0;
    }

    .gsl-carousel-container {
        padding: 0 16px;
    }

    .gsl-carousel-header {
        margin-bottom: 32px;
    }

    .gsl-course-card {
        flex: 0 0 100%;
        min-width: 280px;
    }

    .gsl-carousel-nav {
        display: none;
    }

    .gsl-carousel-wrapper {
        gap: 0;
    }

    .gsl-carousel-track {
        gap: 16px;
    }

    .gsl-course-thumbnail {
        height: 160px;
    }

    .gsl-course-info {
        padding: 16px;
    }

    .gsl-course-title {
        font-size: 16px;
    }

    .gsl-course-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .gsl-enroll-btn {
        width: 100%;
        justify-content: center;
    }
}

/* ============================================
   ACCESSIBILITY & PERFORMANCE
   ============================================ */

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .gsl-carousel-track {
        transition: none;
    }

    .gsl-course-card,
    .gsl-carousel-nav,
    .gsl-carousel-indicator,
    .gsl-enroll-btn,
    .gsl-play-icon {
        transition: none;
        animation: none;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .gsl-course-card {
        border: 2px solid #1f2937;
    }

    .gsl-carousel-nav {
        border-width: 3px;
    }
}

/* Focus visible for keyboard navigation */
.gsl-course-card:focus-visible,
.gsl-carousel-nav:focus-visible,
.gsl-carousel-indicator:focus-visible,
.gsl-enroll-btn:focus-visible {
    outline: 3px solid #0EA5E9;
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .gsl-carousel-nav,
    .gsl-carousel-indicators {
        display: none;
    }

    .gsl-carousel-track {
        flex-wrap: wrap;
    }

    .gsl-course-card {
        page-break-inside: avoid;
    }
}