/**
 * Modern YouTube-style design with light/dark theme
 * Lightweight and responsive
 */

:root {
    /* Light theme (default) */
    --bg-primary: #ffffff;
    --bg-secondary: #f9f9f9;
    --bg-tertiary: #f1f1f1;
    --text-primary: #0f0f0f;
    --text-secondary: #606060;
    --text-tertiary: #909090;
    --border-color: #e5e5e5;
    --accent-color: #065fd4;
    --accent-hover: #0451b8;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.15);
    --radius: 8px;
    --transition: all 0.2s ease;
}

[data-theme="dark"] {
    /* Dark theme */
    --bg-primary: #0f0f0f;
    --bg-secondary: #181818;
    --bg-tertiary: #212121;
    --text-primary: #ffffff;
    --text-secondary: #aaaaaa;
    --text-tertiary: #717171;
    --border-color: #303030;
    --accent-color: #3ea6ff;
    --accent-hover: #5cb3ff;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 16px;
    width: 100%;
}

/* Header styles */
.site-header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 0;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 20px;
    min-width: 120px;
}

/* Group filter and search on desktop */
.header-search-group {
    display: flex;
    align-items: center;
    flex: 1;
    max-width: 740px; /* 140px filter + 600px search */
    margin: 0 auto;
    gap: 0;
}

.header-sort-filter {
    display: flex;
    align-items: center;
}

.search-form {
    display: flex;
    align-items: center;
    flex: 1;
    position: relative;
}

.header-sort-filter .sort-select {
    height: 40px;
    padding: 0 12px;
    border: 1px solid var(--border-color);
    border-right: none;
    border-radius: var(--radius) 0 0 var(--radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    min-width: 140px;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23606060' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

[data-theme="dark"] .header-sort-filter .sort-select {
    background: var(--bg-primary);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23aaaaaa' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

.header-sort-filter .sort-select:hover {
    border-color: var(--accent-color);
}

.header-sort-filter .sort-select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(6, 95, 212, 0.1);
    z-index: 1;
    position: relative;
}

.sort-label {
    display: none;
}

.search-input {
    flex: 1;
    height: 40px;
    padding: 0 16px;
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 16px;
    outline: none;
    transition: var(--transition);
}

.search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(6, 95, 212, 0.1);
    z-index: 1;
    position: relative;
}

[data-theme="dark"] .search-input:focus {
    box-shadow: 0 0 0 2px rgba(62, 166, 255, 0.2);
}

.search-button {
    width: 64px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 var(--radius) var(--radius) 0;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.search-button:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background-color: transparent;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
}

.theme-icon-dark {
    display: none;
}

[data-theme="dark"] .theme-icon-light {
    display: none;
}

[data-theme="dark"] .theme-icon-dark {
    display: block;
}

/* Main content */
.main-content {
    flex: 1;
    padding: 24px 0;
}

/* Homepage styles */
.section-title {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

/* Video card styles */
.video-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.video-link {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.video-thumbnail {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 */
    background-color: var(--bg-tertiary);
    border-radius: var(--radius);
    overflow: hidden;
}

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 2px 4px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s ease;
}

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

.video-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.video-title {
    font-size: 16px;
    font-weight: 500;
    line-height: 1.4;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.video-meta {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Search page styles */
.search-header {
    margin-bottom: 24px;
}

.page-title {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.query-text {
    color: var(--accent-color);
}

.video-description {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 8px 0;
}

/* Pagination */
.pagination {
    margin-top: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.pagination-button {
    padding: 8px 16px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    transition: var(--transition);
}

.pagination-button:hover {
    background-color: var(--border-color);
}

.pagination-info {
    color: var(--text-secondary);
}

/* Video page styles */
.video-layout {
    display: grid;
    grid-template-columns: 1fr 402px;
    gap: 24px;
}

.video-player-container {
    width: 100%;
    background-color: #000;
    border-radius: var(--radius);
    overflow: hidden;
}

.video-player {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
}

.video-player iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-details {
    margin-top: 16px;
}

.video-page-title {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 12px;
}

.video-stats {
    display: flex;
    align-items: center;
    gap: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.video-description-block {
    background-color: var(--bg-secondary);
    padding: 12px;
    border-radius: var(--radius);
    margin-bottom: 24px;
}

.video-description-text {
    font-size: 14px;
    white-space: pre-wrap;
}

.video-comments {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.video-tags-section {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    font-size: 14px;
    line-height: 1.6;
}

.video-tags-list {
    display: inline;
}

.video-tag {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
}

.video-tag:hover {
    text-decoration: underline;
    color: var(--accent-hover);
}

.comments-title {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 16px;
}

/* Sidebar styles */
.sidebar-title {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 16px;
}

.related-videos-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.related-video-item {
    display: flex;
    gap: 12px;
    text-decoration: none;
    color: inherit;
}

.related-thumbnail {
    position: relative;
    width: 168px;
    flex-shrink: 0;
    padding-bottom: 94.5px; /* 16:9 for fixed width */
    background-color: var(--bg-tertiary);
    border-radius: var(--radius);
    overflow: hidden;
}

.related-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.related-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.related-title {
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.related-meta {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Footer styles */
.site-footer {
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 48px 0 24px;
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    margin-bottom: 32px;
}

.footer-info {
    color: var(--text-secondary);
}

.footer-copy {
    font-size: 14px;
}

.footer-generation {
    font-size: 12px;
    margin-top: 4px;
}

/* Recent searches block */
.recent-searches {
    margin-top: 48px;
    padding: 32px 0;
    border-top: 1px solid var(--border-color);
}

.search-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.search-tag {
    display: inline-block;
    padding: 8px 16px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 20px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.search-tag:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* No results / Error page */
.no-results,
.error-page {
    text-align: center;
    padding: 64px 0;
}

.error-title {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.error-message {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.error-button {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    transition: var(--transition);
}

.error-button:hover {
    background-color: var(--accent-hover);
}

/* Responsive */
@media (max-width: 1024px) {
    .video-layout {
        grid-template-columns: 1fr;
    }
    
    .video-sidebar {
        margin-top: 32px;
    }
    
    .related-videos-list {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 16px;
    }
    
    .related-video-item {
        flex-direction: column;
    }
    
    .related-thumbnail {
        width: 100%;
        height: auto;
        padding-bottom: 56.25%;
    }
    
    .related-thumbnail img {
        position: absolute;
    }
}

/* Layout for mobile/tablet */
@media (max-width: 768px) {
    .header-content {
        display: grid;
        grid-template-columns: auto 1fr auto;
        grid-template-areas: 
            "logo filter toggle"
            "search search search";
        gap: 12px;
        padding: 12px 0;
    }

    .header-search-group {
        display: contents; /* Dissolve group for grid areas to work */
    }

    .logo {
        grid-area: logo;
        min-width: auto;
    }

    .header-sort-filter {
        grid-area: filter;
        margin: 0;
        justify-self: center;
    }

    .header-sort-filter .sort-select {
        border-right: 1px solid var(--border-color);
        border-radius: var(--radius);
        min-width: 120px;
    }

    .theme-toggle {
        grid-area: toggle;
        justify-self: end;
    }

    .search-form {
        grid-area: search;
        margin: 0;
        max-width: 100%;
        width: 100%;
    }

    .search-input {
        border-left: 1px solid var(--border-color);
        border-radius: var(--radius) 0 0 var(--radius);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }
    
    .videos-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-search {
        flex-direction: column;
    }
    
    .hero-search-input,
    .hero-search-button {
        border-radius: var(--radius);
    }
    
    .search-form {
        flex-direction: row;
    }
    
    .search-input {
        border-radius: var(--radius) 0 0 var(--radius);
        border-left: 1px solid var(--border-color);
    }
    
    .search-button {
        width: 64px;
        border-radius: 0 var(--radius) var(--radius) 0;
        border-left: none;
    }
}