/* YouTube Vietnamese Video Viewer - Custom Styles */

:root {
    --primary-color: #FF0000;
    --secondary-color: #CC0000;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    --dark-color: #343a40;
    --light-color: #f8f9fa;
}

/* General */
body {
    background-color: #f8f9fa;
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* Video Cards */
.video-card {
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.video-card .play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(255, 255, 255, 0.9);
    font-size: 3rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

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

.video-card .card-img-top {
    transition: filter 0.3s ease;
}

.video-card:hover .card-img-top {
    filter: brightness(0.8);
}

/* Video Container */
.video-container {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 8px;
}

/* Responsive Video Player */
.video-player-section {
    width: 100%;
    background: #000;
    position: relative;
    transition: all 0.3s ease;
}

.video-player-section.theater-mode {
    position: fixed;
    top: 56px; /* Height of navbar */
    left: 0;
    width: 100vw;
    height: calc(100vh - 56px);
    z-index: 9999;
}

/* Ensure navbar stays on top in theater mode */
.navbar {
    position: relative;
    z-index: 10000;
}

.responsive-video-container {
    position: relative;
    width: 100%;
    max-width: 100vw;
    height: calc(100vh - 80px); /* Full viewport height minus navbar */
    min-height: 400px;
    max-height: 800px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #000;
    transition: height 0.3s ease;
}

.theater-mode .responsive-video-container {
    height: calc(100vh - 56px);
    max-height: none;
}

#youtube-player {
    width: 100%;
    height: 100%;
    max-width: calc(100vh * 16/9); /* Maintain 16:9 aspect ratio */
    max-height: calc(100vw * 9/16);
    border: none;
    border-radius: 0;
    transition: all 0.3s ease;
}

.theater-mode #youtube-player {
    max-width: 100vw;
    max-height: 100vh;
}

/* Video Controls Overlay */
.video-controls-overlay {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 10;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.responsive-video-container:hover .video-controls-overlay {
    opacity: 1;
}

.btn-theater-mode {
    background: rgba(0, 0, 0, 0.7);
    border: none;
    color: white;
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.btn-theater-mode:hover {
    background: rgba(0, 0, 0, 0.9);
    transform: scale(1.05);
}

.btn-theater-mode:active {
    transform: scale(0.95);
}

/* Video Thumbnail Hover Effects */
.video-thumbnail {
    position: relative;
    overflow: hidden;
    border-radius: 8px 8px 0 0;
}

.video-thumbnail img {
    transition: transform 0.3s ease, filter 0.3s ease;
}

.video-thumbnail:hover img {
    transform: scale(1.05);
    filter: brightness(0.9);
}

.video-thumbnail .play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(255, 255, 255, 0.95);
    font-size: 2.5rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.6);
}

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

/* Related Videos */
.related-video-card {
    transition: all 0.2s ease;
    border: 1px solid #e9ecef;
}

.related-video-card:hover {
    background-color: #f8f9fa;
    border-color: #dee2e6;
    transform: translateY(-1px);
}

.related-video-card img {
    border-radius: 4px;
}

.video-thumbnail-small {
    position: relative;
    overflow: hidden;
    border-radius: 4px 0 0 4px;
}

.play-overlay-small {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.2rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
}

.hover-shadow {
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.hover-shadow:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

/* Channel Avatar */
.channel-avatar img {
    border: 2px solid #dee2e6;
    transition: border-color 0.2s ease;
}

.channel-avatar img:hover {
    border-color: var(--primary-color);
}

/* Progress Bars */
.progress {
    height: 8px;
    border-radius: 10px;
}

.progress-bar {
    border-radius: 10px;
}

/* Badges */
.badge-sm {
    font-size: 0.75em;
}

/* Admin Dashboard */
.stat-box {
    padding: 1rem 0;
}

.stat-box h3 {
    margin-bottom: 0.5rem;
    font-weight: bold;
}

/* Alerts */
.alert {
    border: none;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
}

/* Cards */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid #dee2e6;
    border-radius: 12px 12px 0 0 !important;
    font-weight: 600;
}

/* Buttons */
.btn {
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s ease;
}

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

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

.btn:hover {
    transform: translateY(-1px);
}

/* Navigation */
.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.navbar-nav .nav-link {
    font-weight: 500;
    transition: color 0.2s ease;
}

/* Mobile navbar improvements */
.navbar-toggler {
    border: none;
    padding: 4px 8px;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.navbar-toggler-icon {
    background-size: 24px 24px;
}

@media (max-width: 991.98px) {
    .navbar-collapse {
        margin-top: 0.5rem;
        padding-top: 0.5rem;
        border-top: 1px solid rgba(255,255,255,0.1);
    }
    
    .navbar-nav .nav-link {
        padding: 0.5rem 1rem;
    }
    
    .dropdown-menu {
        border: none;
        box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    }
}

/* Forms */
.form-control {
    border-radius: 6px;
    border: 1px solid #ced4da;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(255, 0, 0, 0.25);
}

/* Tables */
.table {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
}

.table thead th {
    background-color: #f8f9fa;
    border-bottom: 2px solid #dee2e6;
    font-weight: 600;
    color: #495057;
}

.table-hover tbody tr:hover {
    background-color: #f5f5f5;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner-border {
    color: var(--primary-color);
}

/* Responsive Video Player Breakpoints */
@media (max-width: 1200px) {
    .responsive-video-container {
        height: calc(100vh - 70px);
        max-height: 700px;
    }
}

@media (max-width: 992px) {
    .responsive-video-container {
        height: calc(80vh - 60px);
        max-height: 600px;
        min-height: 350px;
    }
    
    /* Improve card layout for tablets */
    .video-card .card-body {
        padding: 0.75rem;
    }
    
    .video-card .card-title {
        font-size: 0.95rem;
        line-height: 1.3;
    }
}

@media (max-width: 768px) {
    .responsive-video-container {
        height: calc(70vh - 60px);
        max-height: 500px;
        min-height: 300px;
    }
    
    .video-container {
        padding-bottom: 75%; /* Adjust for mobile */
    }
    
    .related-videos {
        margin-top: 2rem;
    }
    
    .stat-box h3 {
        font-size: 1.5rem;
    }
    
    .btn-group .btn {
        padding: 0.25rem 0.5rem;
        font-size: 0.875rem;
    }
    
    /* Mobile optimization */
    .navbar-brand {
        font-size: 1.2rem;
    }
    
    .card-title {
        font-size: 0.9rem;
        line-height: 1.4;
    }
    
    .card-text.small {
        font-size: 0.8rem;
    }
    
    /* Improve button spacing */
    .btn-sm {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    /* Better card spacing */
    .mb-4 {
        margin-bottom: 1.5rem !important;
    }
    
    .mb-3 {
        margin-bottom: 1rem !important;
    }
}

@media (max-width: 480px) {
    .responsive-video-container {
        height: calc(60vh - 50px);
        max-height: 400px;
        min-height: 250px;
    }
    
    /* Ultra mobile optimization */
    .container {
        padding-left: 10px;
        padding-right: 10px;
    }
    
    .navbar-brand {
        font-size: 1rem;
    }
    
    .card-body {
        padding: 0.5rem;
    }
    
    .card-title {
        font-size: 0.85rem;
        line-height: 1.3;
        margin-bottom: 0.5rem;
    }
    
    .btn {
        padding: 0.3rem 0.6rem;
        font-size: 0.75rem;
    }
    
    /* Stack columns on very small screens */
    .col-xl-3, .col-lg-4, .col-md-6, .col-sm-6 {
        margin-bottom: 1rem;
    }
    
    /* Simplify progress bars */
    .progress {
        height: 6px;
    }
    
    /* Make dropdowns work better on mobile */
    .dropdown-menu {
        min-width: 150px;
    }
}

/* Landscape orientation on mobile */
@media (max-height: 600px) and (orientation: landscape) {
    .responsive-video-container {
        height: calc(95vh - 60px);
        min-height: 200px;
    }
}

@media (max-width: 576px) {
    .container-fluid {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .table-responsive {
        font-size: 0.9rem;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group .btn {
        margin-bottom: 2px;
    }
}

/* Custom Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.pulse {
    animation: pulse 2s infinite;
}

/* Dark Mode Theme */
[data-theme="dark"] {
    --primary-color: #FF4444;
    --secondary-color: #CC3333;
    --success-color: #4CAF50;
    --warning-color: #FFA726;
    --danger-color: #F44336;
    --info-color: #42A5F5;
    --dark-color: #121212;
    --light-color: #1e1e1e;
    --text-color: #ffffff;
    --text-muted: #aaaaaa;
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --border-color: #333333;
}

[data-theme="dark"] body {
    background-color: var(--bg-color);
    color: var(--text-color);
}

[data-theme="dark"] .navbar-dark {
    background-color: #000000 !important;
}

[data-theme="dark"] .card {
    background-color: var(--surface-color);
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .card-header {
    background-color: var(--surface-color);
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .form-control {
    background-color: var(--surface-color);
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .form-control:focus {
    background-color: var(--surface-color);
    border-color: var(--primary-color);
    color: var(--text-color);
    box-shadow: 0 0 0 0.2rem rgba(255, 68, 68, 0.25);
}

[data-theme="dark"] .form-select {
    background-color: var(--surface-color);
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

[data-theme="dark"] .btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

[data-theme="dark"] .btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

[data-theme="dark"] .btn-outline-primary:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #ffffff;
}

[data-theme="dark"] .btn-outline-secondary {
    color: var(--text-muted);
    border-color: var(--border-color);
}

[data-theme="dark"] .btn-outline-secondary:hover {
    background-color: var(--border-color);
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .alert {
    background-color: var(--surface-color);
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .alert-info {
    background-color: rgba(66, 165, 245, 0.1);
    border-color: var(--info-color);
    color: var(--info-color);
}

[data-theme="dark"] .alert-success {
    background-color: rgba(76, 175, 80, 0.1);
    border-color: var(--success-color);
    color: var(--success-color);
}

[data-theme="dark"] .alert-warning {
    background-color: rgba(255, 167, 38, 0.1);
    border-color: var(--warning-color);
    color: var(--warning-color);
}

[data-theme="dark"] .alert-danger {
    background-color: rgba(244, 67, 54, 0.1);
    border-color: var(--danger-color);
    color: var(--danger-color);
}

[data-theme="dark"] .text-muted {
    color: var(--text-muted) !important;
}

[data-theme="dark"] .text-dark {
    color: var(--text-color) !important;
}

[data-theme="dark"] .bg-light {
    background-color: var(--surface-color) !important;
}

[data-theme="dark"] .border {
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .table {
    background-color: var(--surface-color);
    color: var(--text-color);
}

[data-theme="dark"] .table thead th {
    background-color: var(--bg-color);
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .table-hover tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.075);
}

[data-theme="dark"] .dropdown-menu {
    background-color: var(--surface-color);
    border-color: var(--border-color);
}

[data-theme="dark"] .dropdown-item {
    color: var(--text-color);
}

[data-theme="dark"] .dropdown-item:hover {
    background-color: var(--bg-color);
    color: var(--text-color);
}

[data-theme="dark"] .modal-content {
    background-color: var(--surface-color);
    color: var(--text-color);
}

[data-theme="dark"] .modal-header {
    border-color: var(--border-color);
}

[data-theme="dark"] .modal-footer {
    border-color: var(--border-color);
}

[data-theme="dark"] .popular-videos-section,
[data-theme="dark"] .mobile-related-videos {
    background-color: var(--surface-color);
}

[data-theme="dark"] .related-video-card,
[data-theme="dark"] .popular-video-card,
[data-theme="dark"] .related-video-card-mobile {
    background-color: var(--surface-color);
    border-color: var(--border-color);
}

[data-theme="dark"] .related-video-card:hover,
[data-theme="dark"] .popular-video-card:hover,
[data-theme="dark"] .related-video-card-mobile:hover {
    background-color: var(--bg-color);
    border-color: var(--primary-color);
}

/* Light Mode (default) */
[data-theme="light"] {
    --primary-color: #FF0000;
    --secondary-color: #CC0000;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    --dark-color: #343a40;
    --light-color: #f8f9fa;
    --text-color: #212529;
    --text-muted: #6c757d;
    --bg-color: #f8f9fa;
    --surface-color: #ffffff;
    --border-color: #dee2e6;
}

/* Print Styles */
@media print {
    .navbar,
    .btn,
    .pagination {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #dee2e6;
    }
}

/* Accessibility Improvements */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus indicators */
.btn:focus,
.form-control:focus,
.card:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Popular Videos Section */
.popular-videos-section {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-top: 1.5rem;
}

.popular-video-card {
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
}

.popular-video-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
    border-color: #dee2e6;
}

.popular-video-card .video-thumbnail {
    position: relative;
    overflow: hidden;
}

.popular-video-card .video-thumbnail img {
    transition: transform 0.3s ease, filter 0.3s ease;
}

.popular-video-card:hover .video-thumbnail img {
    transform: scale(1.05);
    filter: brightness(0.9);
}

.popular-video-card .play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(255, 255, 255, 0.95);
    font-size: 2.5rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.8);
}

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

.popular-video-card .view-badge {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    backdrop-filter: blur(4px);
}

.popular-video-card .card-body {
    padding: 0.75rem;
}

.popular-video-card .card-title a {
    transition: color 0.2s ease;
    text-decoration: none;
}

.popular-video-card .card-title a:hover {
    color: var(--primary-color) !important;
}

/* Mobile Related Videos Section */
.mobile-related-videos {
    background: #fff;
    border-radius: 12px;
    padding: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.related-video-card-mobile {
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
    height: 100%;
}

.related-video-card-mobile:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border-color: #dee2e6;
}

.related-video-card-mobile .video-thumbnail {
    position: relative;
    overflow: hidden;
}

.related-video-card-mobile .video-thumbnail img {
    transition: transform 0.3s ease, filter 0.3s ease;
}

.related-video-card-mobile:hover .video-thumbnail img {
    transform: scale(1.05);
    filter: brightness(0.9);
}

.related-video-card-mobile .play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(255, 255, 255, 0.95);
    font-size: 2rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.8);
}

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

.related-video-card-mobile .card-title a {
    transition: color 0.2s ease;
    text-decoration: none;
}

.related-video-card-mobile .card-title a:hover {
    color: var(--primary-color) !important;
}

/* Responsive adjustments for popular videos */
@media (max-width: 768px) {
    .popular-videos-section {
        padding: 1rem;
        margin-top: 1rem;
    }
    
    .popular-video-card .card-body {
        padding: 0.5rem;
    }
    
    .popular-video-card .card-title {
        font-size: 0.85rem;
        line-height: 1.3;
    }
    
    .popular-video-card .play-overlay {
        font-size: 2rem;
    }
    
    /* Mobile optimizations for edge-to-edge display */
    .container {
        padding-left: 8px;
        padding-right: 8px;
    }
    
    .mobile-related-videos,
    .popular-videos-section {
        margin-left: -8px;
        margin-right: -8px;
        border-radius: 0;
    }
    
    .mobile-related-videos .row,
    .popular-videos-section .row {
        margin-left: -4px;
        margin-right: -4px;
    }
    
    .mobile-related-videos .col-6,
    .popular-videos-section .col-6 {
        padding-left: 4px;
        padding-right: 4px;
    }
}

@media (max-width: 576px) {
    .popular-video-card .video-thumbnail img {
        height: 120px !important;
    }
    
    .related-video-card-mobile .video-thumbnail img {
        height: 120px !important;
    }
    
    /* Ultra mobile optimization */
    .container {
        padding-left: 4px;
        padding-right: 4px;
    }
    
    .mobile-related-videos,
    .popular-videos-section {
        margin-left: -4px;
        margin-right: -4px;
        padding: 0.5rem;
    }
    
    .mobile-related-videos .row,
    .popular-videos-section .row {
        margin-left: -2px;
        margin-right: -2px;
    }
    
    .mobile-related-videos .col-6,
    .popular-videos-section .col-6 {
        padding-left: 2px;
        padding-right: 2px;
    }
    
    .related-video-card-mobile .card-body,
    .popular-video-card .card-body {
        padding: 0.4rem;
    }
    
    .related-video-card-mobile .card-title,
    .popular-video-card .card-title {
        font-size: 0.8rem;
        line-height: 1.2;
        margin-bottom: 0.25rem;
    }
    
    .related-video-card-mobile small,
    .popular-video-card small {
        font-size: 0.7rem;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid #000;
    }
    
    .btn {
        border-width: 2px;
    }
}