/**
 * Tesla YouTube Player - Styles
 * Dark mode, responsive, Tesla browser optimized
 */

/* ============================================
   CSS Variables
============================================ */
:root {
    /* Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-hover: #222222;
    --bg-active: #2a2a2a;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    
    --accent-primary: #e82127;
    --accent-secondary: #ff4444;
    --accent-youtube: #ff0000;
    
    --border-color: #2a2a2a;
    --border-hover: #3a3a3a;
    
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.5);
    
    /* Font */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* ============================================
   Reset & Base
============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Tesla browser scroll optimization */
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Remove tap highlight on Tesla touchscreen */
* {
    -webkit-tap-highlight-color: transparent;
}

/* ============================================
   App Container
============================================ */
#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ============================================
   Header
============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: linear-gradient(to bottom, var(--bg-primary) 0%, var(--bg-primary) 80%, transparent 100%);
    padding: var(--spacing-md) var(--spacing-lg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1600px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-youtube);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.video-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
}

/* ============================================
   Buttons
============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    -webkit-user-select: none;
    user-select: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.btn-icon:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-secondary);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
}

.btn-control {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    backdrop-filter: blur(10px);
}

.btn-control:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-control svg {
    width: 18px;
    height: 18px;
}

.btn-close {
    background: rgba(239, 68, 68, 0.2);
}

.btn-close:hover {
    background: rgba(239, 68, 68, 0.4);
}

/* ============================================
   Main Content
============================================ */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    padding: 0 var(--spacing-lg) var(--spacing-2xl);
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

/* ============================================
   Player Section
============================================ */
.player-section {
    position: relative;
}

.player-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

/* Player Placeholder */
.player-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    text-align: center;
    padding: var(--spacing-xl);
}

.placeholder-icon {
    width: 80px;
    height: 80px;
    color: var(--text-muted);
    opacity: 0.5;
}

.player-placeholder h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.player-placeholder p {
    color: var(--text-secondary);
    max-width: 300px;
}

/* YouTube Player */
.youtube-player {
    position: absolute;
    inset: 0;
}

.youtube-player iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Player Controls */
.player-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    margin-top: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.now-playing {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    min-width: 0;
    flex: 1;
}

.now-playing-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.now-playing-title {
    font-size: 1rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.control-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

/* ============================================
   List Section
============================================ */
.list-section {
    flex: 1;
}

.list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.list-title {
    font-size: 1.25rem;
    font-weight: 600;
}

/* Filters */
.list-filters {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--bg-secondary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.filter-btn.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* ============================================
   States (Loading, Empty, Error)
============================================ */
.loading-state,
.empty-state,
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    text-align: center;
}

/* Spinner */
.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-state p,
.empty-state p,
.error-state p {
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

.empty-icon,
.error-icon {
    width: 64px;
    height: 64px;
    color: var(--text-muted);
    opacity: 0.5;
    margin-bottom: var(--spacing-md);
}

.empty-state h3,
.error-state h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.error-state {
    color: var(--error);
}

.error-state .btn {
    margin-top: var(--spacing-lg);
}

/* ============================================
   Video Grid
============================================ */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* ============================================
   Video Card
============================================ */
.video-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid transparent;
}

.video-card:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.video-card:active {
    transform: translateY(0);
}

.video-card.playing {
    border-color: var(--accent-youtube);
    box-shadow: 0 0 0 1px var(--accent-youtube);
}

/* Thumbnail */
.video-thumbnail {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--bg-tertiary);
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

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

/* Duration Badge */
.video-duration {
    position: absolute;
    bottom: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: 2px 6px;
    background: rgba(0, 0, 0, 0.8);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

/* Live Badge */
.live-badge {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    padding: 2px 8px;
    background: var(--accent-youtube);
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Play Overlay */
.play-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

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

.play-overlay svg {
    width: 60px;
    height: 60px;
    color: white;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.5));
}

/* Video Info */
.video-info {
    padding: var(--spacing-md);
}

.video-title {
    font-size: 0.9375rem;
    font-weight: 500;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.video-channel {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.video-added {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ============================================
   Load More
============================================ */
.load-more {
    display: flex;
    justify-content: center;
    padding: var(--spacing-xl) 0;
}

/* ============================================
   Toast Notifications
============================================ */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: 1000;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--text-muted);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.success {
    border-left-color: var(--success);
}

.toast.error {
    border-left-color: var(--error);
}

.toast.warning {
    border-left-color: var(--warning);
}

/* ============================================
   Fullscreen Mode
============================================ */
.fullscreen .header,
.fullscreen .list-section,
.fullscreen .player-controls {
    display: none !important;
}

.fullscreen .main-content {
    padding: 0;
    max-width: none;
}

.fullscreen .player-section {
    position: fixed;
    inset: 0;
    z-index: 1000;
}

.fullscreen .player-container {
    border-radius: 0;
    height: 100vh;
    aspect-ratio: unset;
}

/* Exit fullscreen button */
.fullscreen-exit {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 1001;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.875rem;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.fullscreen:hover .fullscreen-exit {
    opacity: 1;
}

/* ============================================
   Responsive - Tablet
============================================ */
@media (max-width: 1024px) {
    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: var(--spacing-md);
    }
}

/* ============================================
   Responsive - Mobile / Tesla Portrait
============================================ */
@media (max-width: 768px) {
    :root {
        font-size: 14px;
    }
    
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .main-content {
        padding: 0 var(--spacing-md) var(--spacing-xl);
    }
    
    .video-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .player-controls {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .control-buttons {
        width: 100%;
    }
    
    .control-buttons .btn {
        flex: 1;
    }
    
    .list-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .list-filters {
        justify-content: center;
    }
}

/* ============================================
   Tesla Browser Specific Optimizations
============================================ */
/* Larger touch targets for Tesla touchscreen */
@media (hover: none) and (pointer: coarse) {
    .btn {
        min-height: 48px;
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .filter-btn {
        padding: var(--spacing-md);
    }
    
    .video-card {
        /* Prevent accidental taps */
        -webkit-touch-callout: none;
    }
}

/* High contrast for sunlight readability */
@media (prefers-contrast: high) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #0a0a0a;
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
    }
}

/* Reduce motion for performance */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print hidden */
@media print {
    .header,
    .player-section,
    .toast-container {
        display: none !important;
    }
}