/* =========================
   CSS Variables & Reset
========================= */
:root {
    /* Colors */
    --bg-primary: #0a0e27;
    --bg-secondary: #141931;
    --bg-tertiary: #1e2440;
    --bg-glass: rgba(30, 36, 64, 0.7);

    --text-primary: #ffffff;
    --text-secondary: #a0a8c8;
    --text-muted: #6b7394;

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    background-attachment: fixed;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* =========================
   Header
========================= */
.header {
    padding: var(--spacing-lg) 0;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    text-align: center;
}

.logo {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 0 20px rgba(99, 102, 241, 0.5));
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

/* =========================
   Main Content
========================= */
.main {
    padding: var(--spacing-xl) 0;
    min-height: calc(100vh - 200px);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, #ffffff 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =========================
   Platform Grid
========================= */
.platform-section {
    animation: fadeIn 0.5s ease;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.platform-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.platform-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-medium);
    z-index: 0;
}

.platform-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

.platform-card:hover::before {
    opacity: 0.1;
}

.platform-card-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.platform-icon {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-md);
    object-fit: cover;
    transition: transform var(--transition-medium);
}

.platform-card:hover .platform-icon {
    transform: scale(1.05);
}

.platform-name {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
}

.platform-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
}

/* =========================
   Video Section
========================= */
.video-section {
    animation: fadeIn 0.5s ease;
}

.video-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.back-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.back-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    transform: translateX(-4px);
}

/* =========================
   Video Player
========================= */
.video-player-container {
    margin-bottom: var(--spacing-xl);
}

.video-player {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

#videoPlayer {
    width: 100%;
    max-height: 70vh;
    background: #000;
    display: block;
}

.video-info {
    padding: var(--spacing-lg);
}

#videoTitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.video-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.separator {
    color: var(--text-muted);
}

/* =========================
   Episode Navigation
========================= */
.episode-navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    gap: var(--spacing-md);
}

.episode-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: 'Inter', sans-serif;
}

.episode-btn:hover:not(:disabled) {
    background: var(--accent-gradient);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.episode-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.episode-btn svg {
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.episode-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
    flex: 1;
}


/* =========================
   Video List
========================= */
.video-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.list-title {
    font-size: 1.5rem;
    font-weight: 600;
}

.view-toggle {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: var(--spacing-xs);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-btn:hover {
    color: var(--text-primary);
}

.toggle-btn.active {
    background: var(--accent-gradient);
    color: var(--text-primary);
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    transition: all var(--transition-medium);
}

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

.video-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-medium);
}

.video-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-primary);
}

.video-thumbnail {
    position: relative;
    padding-top: 56.25%;
    /* 16:9 Aspect Ratio */
    background: var(--bg-tertiary);
    overflow: hidden;
}

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-medium);
}

.video-item:hover .video-thumbnail img {
    transform: scale(1.05);
}

.video-thumbnail .play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(99, 102, 241, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-medium);
}

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

.play-overlay svg {
    width: 24px;
    height: 24px;
    fill: white;
    margin-left: 4px;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.8);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.video-item-info {
    padding: var(--spacing-md);
}

.video-item-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
}

.video-item-meta {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* List View Specific Styles */
.video-grid.list-view .video-item {
    display: flex;
    flex-direction: row;
}

.video-grid.list-view .video-thumbnail {
    flex: 0 0 300px;
    padding-top: 0;
    height: 180px;
}

.video-grid.list-view .video-item-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* =========================
   Loading State
========================= */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    gap: var(--spacing-md);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* =========================
   Footer
========================= */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    text-align: center;
    color: var(--text-secondary);
    margin-top: var(--spacing-xl);
}

/* =========================
   Utilities
========================= */
.hidden {
    display: none !important;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =========================
   Responsive Design
========================= */
@media (max-width: 768px) {
    .logo {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .platform-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }

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

    .video-grid.list-view .video-item {
        flex-direction: column;
    }

    .video-grid.list-view .video-thumbnail {
        flex: 1;
        padding-top: 56.25%;
        height: auto;
    }

    .video-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .platform-grid {
        grid-template-columns: 1fr;
    }

    .platform-icon {
        width: 100px;
        height: 100px;
    }
}