/* ==================== 亮色模式变量（默认） ==================== */
:root {
    --bg-color: #f6f7f9;
    --text-color: #18191c;
    --card-bg: #fff;
    --card-border: #e5e9ef;
    --status-bg: #ecf9ff;
    --status-text: #025;
    --status-border: #00a1d6;
    --nav-btn-bg: #e0e0e0;
    --nav-btn-text: #333;
    --nav-btn-hover-bg: #00a1d6;
    --nav-btn-hover-text: white;
    --about-bg: white;
    --about-text: #333;
    --count-bg: #e8f4fd;
    --count-text: #666;
    --count-border: #00a1d6;
    --footer-bg: #f0f0f0;
    --footer-text: #444;
    --footer-border: #ddd;
    --cat-btn-bg: #e0e0e0;
    --cat-btn-text: #333;
    --cat-btn-hover-bg: #00a1d6;
    --cat-btn-hover-text: white;
    --cat-btn-active-bg: #00a1d6;
    --cat-btn-active-text: white;
    /* 搜索和排序变量 */
    --search-bg: white;
    --search-text: #333;
    --search-border: #ddd;
    --sort-btn-bg: #e0e0e0;
    --sort-btn-text: #333;
    --sort-btn-hover-bg: #00a1d6;
    --sort-btn-hover-text: white;
}

/* ==================== 暗色模式变量 ==================== */
body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --card-bg: #2d2d2d;
    --card-border: #444;
    --status-bg: #1e2a3a;
    --status-text: #a0d0ff;
    --status-border: #4a9eff;
    --nav-btn-bg: #3a3a3a;
    --nav-btn-text: #ccc;
    --nav-btn-hover-bg: #4a9eff;
    --nav-btn-hover-text: #fff;
    --about-bg: #2d2d2d;
    --about-text: #ddd;
    --count-bg: #2a3a4a;
    --count-text: #b0d0ff;
    --count-border: #4a9eff;
    --footer-bg: #2a2a2a;
    --footer-text: #aaa;
    --footer-border: #444;
    --cat-btn-bg: #3a3a3a;
    --cat-btn-text: #ccc;
    --cat-btn-hover-bg: #4a9eff;
    --cat-btn-hover-text: #fff;
    --cat-btn-active-bg: #4a9eff;
    --cat-btn-active-text: #fff;
    /* 暗色搜索和排序变量 */
    --search-bg: #2d2d2d;
    --search-text: #e0e0e0;
    --search-border: #444;
    --sort-btn-bg: #3a3a3a;
    --sort-btn-text: #ccc;
    --sort-btn-hover-bg: #4a9eff;
    --sort-btn-hover-text: #fff;
}

/* ==================== 基础重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-color);
    padding: 40px 20px;
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    position: relative;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    margin-bottom: 10px;
    font-weight: 600;
    font-size: 2rem;
    color: #00a1d6; /* 品牌色保持不变 */
}

.author-info {
    text-align: center;
    margin-bottom: 20px;
    color: #000;
    font-size: 1.8rem;
    font-weight: 500;
}
body.dark-mode .author-info {
    color: #fff;
}

/* ==================== 导航栏（两行布局） ==================== */
.nav-container {
    margin-bottom: 30px;
}

.nav-container .nav-actions + .nav-actions { margin-top: 12px; }
.nav-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 15px;
}

.nav-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    /* 确保没有绝对定位影响 */
    position: static; }

.nav-btn {
    padding: 10px 25px;
    font-size: 1.1rem;
    border: none;
    background: var(--nav-btn-bg);
    color: var(--nav-btn-text);
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
    min-width: 90px;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}
.nav-btn:hover {
    background: var(--nav-btn-hover-bg);
    color: var(--nav-btn-hover-text);
}
.nav-btn.active {
    background: var(--nav-btn-hover-bg);
    color: var(--nav-btn-hover-text);
    box-shadow: 0 4px 10px rgba(0,161,214,0.3);
}

/* 夜间模式切换按钮（统一样式） */
.theme-toggle, .share-btn {
    background: var(--nav-btn-bg);
    color: var(--nav-btn-text);
    border: none;
    border-radius: 30px;
    padding: 10px 25px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
    min-width: 90px;
    position: static; /* 确保不使用绝对定位 */
}
.theme-toggle:hover, .share-btn:hover {
    background: var(--nav-btn-hover-bg);
    color: var(--nav-btn-hover-text);
}

/* 响应式：手机屏幕下按钮稍小 */
@media (max-width: 600px) {
    .nav-btn, .theme-toggle, .share-btn {
        padding: 8px 16px;
        font-size: 1rem;
        min-width: auto;
    }
    /* 手机端补充：卡片内边距与字号 */
    .home-card, .about-content, .changelog-content {
        padding: 20px;
        font-size: 1rem;
    }
    .container {
        padding: 12px;
    }
}

/* ==================== 卡片样式（首页、关于等） ==================== */
.home-card,
.about-content,
.changelog-content {
    background: var(--about-bg);
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--about-text);
    margin-bottom: 30px;
}
.home-card:last-child {
    margin-bottom: 0;
}
.about-content h2,
.changelog-content h2 {
    color: #00a1d6;
    margin-bottom: 20px;
    font-size: 1.8rem;
    text-align: center;
}
.about-content p,
.changelog-content p {
    margin-bottom: 20px;
}
.about-content ul,
.changelog-content ul {
    margin-left: 40px;
    margin-bottom: 20px;
}

/* 视频容器（LOGO视频） */
.video-container {
    text-align: center;
    margin-bottom: 30px;
}
.video-container video,
.video-container iframe {
    width: 100%;
    max-width: 800px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.video-container p {
    margin-top: 10px;
    color: var(--count-text);
}

/* ==================== 视频页面相关 ==================== */
.video-count {
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: var(--count-text);
    background: var(--count-bg);
    padding: 8px;
    border-radius: 8px;
    border-left: 4px solid var(--count-border);
}

.category-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}
.cat-btn {
    padding: 8px 16px;
    font-size: 0.95rem;
    border: 1px solid var(--card-border);
    background: var(--cat-btn-bg);
    color: var(--cat-btn-text);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s;
}
.cat-btn:hover {
    background: var(--cat-btn-hover-bg);
    color: var(--cat-btn-hover-text);
    border-color: var(--cat-btn-hover-bg);
}
.cat-btn.active {
    background: var(--cat-btn-active-bg);
    color: var(--cat-btn-active-text);
    border-color: var(--cat-btn-active-bg);
}

.video-controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}
.search-box {
    flex: 1 1 250px;
    max-width: 300px;
    padding: 8px 15px;
    font-size: 1rem;
    border: 1px solid var(--search-border);
    border-radius: 30px;
    background: var(--search-bg);
    color: var(--search-text);
    outline: none;
    transition: border-color 0.2s;
}
.search-box:focus {
    border-color: var(--status-border);
}
.sort-buttons {
    display: flex;
    gap: 10px;
}
.sort-btn {
    padding: 8px 20px;
    font-size: 0.95rem;
    border: 1px solid var(--card-border);
    background: var(--sort-btn-bg);
    color: var(--sort-btn-text);
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.2s;
}
.sort-btn:hover {
    background: var(--sort-btn-hover-bg);
    color: var(--sort-btn-hover-text);
    border-color: var(--sort-btn-hover-bg);
}
.sort-btn.active {
    background: var(--sort-btn-hover-bg);
    color: var(--sort-btn-hover-text);
    border-color: var(--sort-btn-hover-bg);
}

.search-hint {
    text-align: center;
    margin: 5px 0 15px 0;
    font-size: 0.9rem;
    color: var(--count-text);
    opacity: 0.8;
    line-height: 1.4;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.video-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    cursor: pointer;
    border: 1px solid var(--card-border);
}
.video-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0,161,214,0.15);
    border-color: #00a1d6;
}
.cover-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    background: #e5e9ef;
}
.video-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.duration-badge {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.7);
    color: white;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    backdrop-filter: blur(2px);
}
.video-info {
    padding: 16px;
}
.video-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    line-clamp: 2;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--text-color);
}
.video-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--count-text);
}
.meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}
.bv-text {
    font-size: 0.75rem;
    color: #c0c4cc;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--card-border);
    word-break: break-all;
}
.status-note {
    margin-top: 40px;
    padding: 20px;
    background: var(--status-bg);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--status-text);
    border-left: 4px solid var(--status-border);
}
.status-note pre {
    background: #fff;
    padding: 12px;
    border-radius: 6px;
    margin: 12px 0;
    overflow-x: auto;
    border: 1px solid #b8e2f2;
}

/* ==================== 底部统计区域 ==================== */
.site-stats {
    margin-top: 20px;
    padding: 16px 20px;
    background: var(--footer-bg);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--footer-text);
    text-align: center;
    border: 1px solid var(--footer-border);
}
.stats-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
}

/* ==================== 回到顶部按钮 ==================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--nav-btn-bg);
    color: var(--nav-btn-text);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    cursor: pointer;
    border: 1px solid var(--card-border);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s, background 0.2s;
    z-index: 100;
}
.back-to-top.show {
    opacity: 1;
    visibility: visible;
}
.back-to-top:hover {
    background: var(--nav-btn-hover-bg);
    color: var(--nav-btn-hover-text);
}
/* ==================== 固定在右下角的夜间模式按钮 ==================== */
.theme-toggle-fixed {
    position: fixed;
    bottom: 90px;        /* 回到顶部按钮高度约50px，再加40px间距，放在它上面 */
    right: 30px;
    background: var(--nav-btn-bg);
    color: var(--nav-btn-text);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.2s;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.theme-toggle-fixed:hover {
    background: var(--nav-btn-hover-bg);
    color: var(--nav-btn-hover-text);
}

/* 小屏幕下适当缩小间距和尺寸 */
@media (max-width: 600px) {
    .theme-toggle-fixed {
        width: 40px;
        height: 40px;
        font-size: 20px;
        bottom: 80px;
        right: 20px;
    }
    .back-to-top {
        width: 40px;
        height: 40px;
        font-size: 20px;
        bottom: 20px;
        right: 20px;
    }
}