/**
 * Modern Video Feed Styles
 * Grid layout with responsive design
 * Dependencies: design-system.css, components.css
 */

/* ==========================================
   FEED HEADER & FILTERS
   ========================================== */

.feed-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-6);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.feed-tabs {
    border-bottom: none;
    margin-bottom: 0;
}

.feed-actions {
    display: flex;
    gap: var(--space-2);
}

/* ==========================================
   CATEGORY PILLS
   ========================================== */

.category-pills {
    display: flex;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.category-pills::-webkit-scrollbar {
    display: none;
}

.category-pill {
    flex-shrink: 0;
    padding: var(--space-2) var(--space-4);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-full);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--transition-fast) var(--ease-out);
    white-space: nowrap;
}

.category-pill:hover {
    background-color: var(--color-surface-hover);
    border-color: var(--color-divider);
}

.category-pill.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* ==========================================
   VIDEO GRID LAYOUT
   ========================================== */

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-6);
    padding: var(--space-6);
    max-width: var(--container-2xl);
    margin: 0 auto;
}

@media (max-width: 768px) {
    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: var(--space-4);
        padding: var(--space-4);
    }
}

@media (max-width: 480px) {
    .video-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
        padding: var(--space-3);
    }
}

/* ==========================================
   VIDEO CARD
   ========================================== */

.video-card {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-base) var(--ease-out);
    position: relative;
}

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

.video-card-thumbnail {
    position: relative;
    width: 100%;
    aspect-ratio: 9 / 16;
    background-color: var(--color-background);
    overflow: hidden;
}

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

.video-card-thumbnail::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    pointer-events: none;
}

.video-card-play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 64px;
    height: 64px;
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    opacity: 0;
    transition: opacity var(--transition-fast) var(--ease-out);
    pointer-events: none;
}

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

.video-card-duration {
    position: absolute;
    bottom: var(--space-2);
    right: var(--space-2);
    padding: var(--space-1) var(--space-2);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    border-radius: var(--border-radius-sm);
    z-index: 2;
}

.video-card-badge {
    position: absolute;
    top: var(--space-2);
    left: var(--space-2);
    padding: var(--space-1) var(--space-3);
    background-color: var(--color-accent);
    color: white;
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    border-radius: var(--border-radius-full);
    text-transform: uppercase;
    z-index: 2;
}

.video-card-info {
    padding: var(--space-4);
}

.video-card-title {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: var(--leading-snug);
}

.video-card-creator {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.video-card-creator-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    background-color: var(--color-background);
}

.video-card-creator-name {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    font-weight: var(--font-medium);
    flex: 1;
}

.video-card-creator-verified {
    color: var(--color-primary);
    font-size: var(--text-sm);
}

.video-card-stats {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.video-card-stat {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.video-card-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    border-top: 1px solid var(--color-border);
}

.video-card-action-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2);
    background: none;
    border: none;
    border-radius: var(--border-radius-md);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast) var(--ease-out);
}

.video-card-action-btn:hover {
    background-color: var(--color-surface-hover);
    color: var(--color-text-primary);
}

.video-card-action-btn.liked {
    color: var(--color-accent);
}

/* ==========================================
   VIDEO SKELETON LOADER
   ========================================== */

.video-skeleton {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
}

.video-skeleton::before {
    content: "";
    display: block;
    width: 100%;
    aspect-ratio: 9 / 16;
    background: linear-gradient(
        90deg,
        var(--color-surface) 0%,
        var(--color-surface-hover) 50%,
        var(--color-surface) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
}

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

/* ==========================================
   INFINITE SCROLL LOADER
   ========================================== */

.infinite-scroll-loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-8);
}

/* ==========================================
   VIDEO PLAYER MODAL (Full Screen)
   ========================================== */

.video-player-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.95);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
}

.video-player-container {
    position: relative;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
}

.video-player {
    width: 100%;
    height: auto;
    max-height: 90vh;
    border-radius: var(--border-radius-xl);
    background-color: black;
}

.video-player-close {
    position: absolute;
    top: -50px;
    right: 0;
    background: none;
    border: none;
    color: white;
    font-size: var(--text-3xl);
    cursor: pointer;
    padding: var(--space-2);
    transition: transform var(--transition-fast) var(--ease-out);
}

.video-player-close:hover {
    transform: scale(1.1);
}

.video-player-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-6);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
    color: white;
}

.video-player-title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-2);
}

.video-player-creator {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.video-player-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.video-player-action {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    transition: transform var(--transition-fast) var(--ease-out);
}

.video-player-action:hover {
    transform: scale(1.1);
}

.video-player-action-icon {
    font-size: var(--text-2xl);
}

.video-player-action-count {
    font-size: var(--text-xs);
}

/* ==========================================
   RESPONSIVE ADJUSTMENTS
   ========================================== */

@media (max-width: 768px) {
    .feed-header {
        padding: var(--space-3) var(--space-4);
    }

    .category-pills {
        padding: var(--space-3) var(--space-4);
    }

    .video-player-modal {
        padding: 0;
    }

    .video-player-container {
        max-width: 100%;
        max-height: 100vh;
    }

    .video-player {
        border-radius: 0;
        max-height: 100vh;
    }

    .video-player-close {
        top: var(--space-4);
        right: var(--space-4);
    }
}

/* ==========================================
   DARK MODE OPTIMIZATIONS
   ========================================== */

@media (prefers-color-scheme: dark) {
    .video-card-thumbnail::after {
        background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
    }

    .video-player-modal {
        background-color: rgba(0, 0, 0, 0.98);
    }
}