/* Enhanced Mobile Lesson List - Clear, Readable, Premium */

/* Lesson List Container */
.lesson-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
}

/* Lesson Card - Mobile Optimized */
.lesson-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: white;
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    transition: all var(--transition-base);
    cursor: pointer;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.lesson-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--gradient-accent);
    transform: scaleY(0);
    transition: transform var(--transition-base);
}

.lesson-card:hover::before {
    transform: scaleY(1);
}

.lesson-card:hover {
    border-color: var(--color-lvlup-blue-light);  /* Light blue border on hover */
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* Lesson Thumbnail */
.lesson-thumbnail {
    width: 100px;
    height: 100px;
    flex-shrink: 0;
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    position: relative;
    overflow: hidden;
}

.lesson-thumbnail::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-overlay);
}

.lesson-play-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 10;
}

.lesson-card:hover .lesson-play-overlay {
    opacity: 1;
}

.lesson-play-icon {
    width: 40px;
    height: 40px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-lvlup-blue);
    font-size: 1rem;
    padding-left: 3px;
    box-shadow: var(--shadow-lg);
}

/* Lesson Info */
.lesson-info {
    flex: 1;
    min-width: 0;
}

.lesson-type {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    background: var(--gradient-accent);
    color: white;
    font-size: 0.6875rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.lesson-title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--color-navy);
    margin: var(--spacing-xs) 0;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.lesson-description {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.lesson-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    font-size: 0.75rem;
    color: var(--color-gray-500);
}

.lesson-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.lesson-meta-item i {
    color: var(--color-lvlup-blue);
}

/* Lesson Status Badges */
.lesson-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: 0.25rem 0.5rem;
    background: var(--color-success);
    color: white;
    font-size: 0.6875rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.lesson-badge.new {
    background: var(--color-info);
}

.lesson-badge.required {
    background: var(--color-warning);
}

/* Compact Lesson View */
.lesson-card.compact {
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
}

.lesson-card.compact .lesson-thumbnail {
    width: 70px;
    height: 70px;
    font-size: 1.75rem;
}

.lesson-card.compact .lesson-title {
    font-size: 0.9375rem;
}

.lesson-card.compact .lesson-description {
    display: none;
}

/* List View Alternative */
.lesson-list.list-view .lesson-card {
    flex-direction: row;
    align-items: flex-start;
}

.lesson-list.list-view .lesson-thumbnail {
    width: 80px;
    height: 80px;
}

/* Mobile Responsive */
@media (max-width: 640px) {
    .lesson-list {
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
    }
    
    .lesson-card {
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
    }
    
    .lesson-thumbnail {
        width: 90px;
        height: 90px;
        font-size: 2rem;
    }
    
    .lesson-play-icon {
        width: 36px;
        height: 36px;
        font-size: 0.875rem;
    }
    
    .lesson-type {
        font-size: 0.625rem;
        padding: 0.1875rem 0.5rem;
    }
    
    .lesson-title {
        font-size: 0.9375rem;
        margin: 0.25rem 0;
    }
    
    .lesson-description {
        font-size: 0.8125rem;
        -webkit-line-clamp: 2;
    }
    
    .lesson-meta {
        font-size: 0.6875rem;
        gap: var(--spacing-sm);
    }
}

/* Very Small Screens */
@media (max-width: 480px) {
    .lesson-card {
        padding: var(--spacing-sm);
    }
    
    .lesson-thumbnail {
        width: 75px;
        height: 75px;
        font-size: 1.75rem;
    }
    
    .lesson-title {
        font-size: 0.875rem;
    }
    
    .lesson-description {
        font-size: 0.75rem;
        -webkit-line-clamp: 1;
    }
    
    .lesson-meta {
        font-size: 0.625rem;
    }
}

/* Empty State */
.lesson-list-empty {
    padding: var(--spacing-2xl);
    text-align: center;
    color: var(--color-gray-500);
}

.lesson-list-empty-icon {
    font-size: 3rem;
    color: var(--color-gray-300);
    margin-bottom: var(--spacing-md);
}

.lesson-list-empty-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
}

.lesson-list-empty-description {
    font-size: 0.9375rem;
    color: var(--color-gray-500);
}

/* Loading State */
.lesson-card.loading {
    pointer-events: none;
    opacity: 0.6;
}

.lesson-card.loading .lesson-thumbnail {
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Skeleton Loader */
.lesson-skeleton {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: white;
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
}

.lesson-skeleton-thumb {
    width: 100px;
    height: 100px;
    background: linear-gradient(90deg, var(--color-gray-200) 0%, var(--color-gray-100) 50%, var(--color-gray-200) 100%);
    background-size: 200% 100%;
    border-radius: var(--radius-lg);
    animation: shimmer 1.5s infinite;
}

.lesson-skeleton-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.lesson-skeleton-line {
    height: 12px;
    background: linear-gradient(90deg, var(--color-gray-200) 0%, var(--color-gray-100) 50%, var(--color-gray-200) 100%);
    background-size: 200% 100%;
    border-radius: var(--radius-sm);
    animation: shimmer 1.5s infinite;
}

.lesson-skeleton-line.short {
    width: 60%;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}