/* 三级视频 - 全局样式 | jh9wr5.cn */
/* 原创配色方案：深海蓝 + 金色 + 珊瑚红 */

:root {
    --primary: #0a1e50;
    --primary-light: #1a3a8c;
    --gold: #c9a84c;
    --gold-light: #e8c97a;
    --coral: #e05a4e;
    --coral-light: #f07a70;
    --white: #ffffff;
    --light-bg: #f4f6fb;
    --gray: #8a9ab5;
    --dark-text: #1a2340;
    --border: #dde3f0;
    --shadow: 0 4px 24px rgba(10,30,80,0.10);
    --shadow-hover: 0 8px 36px rgba(10,30,80,0.18);
    --radius: 12px;
    --radius-sm: 6px;
    --transition: 0.28s cubic-bezier(.4,0,.2,1);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
    color: var(--dark-text);
    background: var(--white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--gold); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ===== 顶部公告栏 ===== */
.top-bar {
    background: var(--primary);
    color: rgba(255,255,255,0.85);
    font-size: 13px;
    padding: 6px 0;
    text-align: center;
}
.top-bar a { color: var(--gold-light); }
.top-bar .top-bar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.site-header {
    background: var(--white);
    box-shadow: 0 2px 12px rgba(10,30,80,0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    height: 68px;
    gap: 32px;
}
.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.site-logo img {
    height: 44px;
    width: auto;
}
.site-logo .logo-text {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 2px;
}
.site-logo .logo-sub {
    font-size: 11px;
    color: var(--gray);
    letter-spacing: 1px;
}

/* 主导航 */
.main-nav { flex: 1; }
.main-nav ul {
    display: flex;
    align-items: center;
    gap: 4px;
}
.main-nav ul li a {
    display: block;
    padding: 8px 14px;
    font-size: 15px;
    font-weight: 500;
    color: var(--dark-text);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    white-space: nowrap;
}
.main-nav ul li a:hover,
.main-nav ul li a.active {
    color: var(--primary);
    background: rgba(10,30,80,0.07);
}

/* 搜索框 */
.header-search {
    display: flex;
    align-items: center;
    background: var(--light-bg);
    border: 1.5px solid var(--border);
    border-radius: 24px;
    padding: 0 16px;
    height: 38px;
    gap: 8px;
    min-width: 200px;
    transition: border-color var(--transition);
}
.header-search:focus-within {
    border-color: var(--primary-light);
}
.header-search input {
    background: none;
    border: none;
    outline: none;
    font-size: 14px;
    color: var(--dark-text);
    width: 100%;
}
.header-search input::placeholder { color: var(--gray); }
.header-search button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray);
    display: flex;
    align-items: center;
    padding: 0;
    transition: color var(--transition);
}
.header-search button:hover { color: var(--primary); }

/* 汉堡菜单 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    gap: 5px;
}
.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ===== 搜索栏（导航下方） ===== */
.search-bar-section {
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    padding: 14px 0;
}
.search-bar-inner {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    gap: 0;
}
.search-bar-inner input {
    flex: 1;
    height: 46px;
    padding: 0 20px;
    font-size: 15px;
    border: none;
    border-radius: 24px 0 0 24px;
    outline: none;
    background: rgba(255,255,255,0.95);
    color: var(--dark-text);
}
.search-bar-inner button {
    height: 46px;
    padding: 0 28px;
    background: var(--gold);
    color: var(--primary);
    border: none;
    border-radius: 0 24px 24px 0;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: background var(--transition);
}
.search-bar-inner button:hover { background: var(--gold-light); }

/* ===== 容器 ===== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 区块标题 ===== */
.section-header {
    text-align: center;
    margin-bottom: 48px;
}
.section-header h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}
.section-header h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--gold), var(--coral));
    border-radius: 2px;
    margin: 10px auto 0;
}
.section-header p {
    color: var(--gray);
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Hero Banner ===== */
.hero {
    position: relative;
    min-height: 560px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--primary);
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('/assets/images/hero-banner.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.35;
}
.hero-content {
    position: relative;
    z-index: 2;
    color: var(--white);
    max-width: 680px;
}
.hero-content h1 {
    font-size: 52px;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 20px;
    text-shadow: 0 2px 12px rgba(0,0,0,0.4);
}
.hero-content h1 span { color: var(--gold-light); }
.hero-content p {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 32px;
    opacity: 0.9;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--gold);
    color: var(--primary);
    border-radius: 32px;
    font-size: 16px;
    font-weight: 700;
    transition: all var(--transition);
    border: 2px solid var(--gold);
}
.btn-primary:hover {
    background: var(--gold-light);
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(201,168,76,0.4);
}
.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: transparent;
    color: var(--white);
    border-radius: 32px;
    font-size: 16px;
    font-weight: 600;
    border: 2px solid rgba(255,255,255,0.6);
    transition: all var(--transition);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.15);
    color: var(--white);
    border-color: var(--white);
}
.hero-stats {
    position: absolute;
    bottom: 40px;
    right: 0;
    display: flex;
    gap: 40px;
    z-index: 2;
}
.hero-stat { text-align: center; color: var(--white); }
.hero-stat .num {
    font-size: 36px;
    font-weight: 900;
    color: var(--gold-light);
    display: block;
}
.hero-stat .label { font-size: 13px; opacity: 0.8; }

/* ===== 视频卡片 ===== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.video-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    cursor: pointer;
}
.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}
.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--primary);
}
.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10,30,80,0.35);
    opacity: 0;
    transition: opacity var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.video-play-btn svg {
    width: 56px;
    height: 56px;
    filter: drop-shadow(0 2px 8px rgba(0,0,0,0.5));
}
.video-duration {
    position: absolute;
    bottom: 8px;
    right: 10px;
    background: rgba(0,0,0,0.72);
    color: #fff;
    font-size: 12px;
    padding: 2px 7px;
    border-radius: 4px;
}
.video-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--coral);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    letter-spacing: 0.5px;
}
.video-badge.hot { background: var(--coral); }
.video-badge.new { background: var(--primary-light); }
.video-badge.ai { background: #7c3aed; }
.video-info { padding: 14px 16px 16px; }
.video-info h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--dark-text);
    margin-bottom: 8px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.video-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--gray);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }

/* ===== 图片卡片 ===== */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.photo-card {
    border-radius: var(--radius);
    overflow: hidden;
    aspect-ratio: 3/4;
    position: relative;
    cursor: pointer;
    box-shadow: var(--shadow);
}
.photo-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.photo-card:hover img { transform: scale(1.06); }
.photo-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(10,30,80,0.7) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition);
    display: flex;
    align-items: flex-end;
    padding: 16px;
    color: #fff;
}
.photo-card:hover .photo-overlay { opacity: 1; }
.photo-overlay h4 { font-size: 14px; font-weight: 600; }

/* ===== 专家卡片 ===== */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.expert-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 28px 20px 24px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    border: 1.5px solid var(--border);
}
.expert-card:hover {
    border-color: var(--gold);
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}
.expert-avatar {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 14px;
    border: 3px solid var(--gold);
}
.expert-name { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.expert-title {
    font-size: 13px;
    color: var(--gray);
    margin-bottom: 12px;
}
.expert-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    margin-bottom: 16px;
}
.expert-tag {
    background: var(--light-bg);
    color: var(--primary-light);
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 20px;
    font-weight: 500;
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
    padding: 6px 14px;
    font-size: 12px;
    border-radius: 20px;
    font-weight: 600;
    transition: all var(--transition);
    cursor: pointer;
    border: 1.5px solid var(--primary);
    color: var(--primary);
    background: transparent;
}
.btn-sm:hover { background: var(--primary); color: var(--white); }
.btn-sm.filled { background: var(--primary); color: var(--white); }
.btn-sm.filled:hover { background: var(--primary-light); border-color: var(--primary-light); }

/* ===== 功能特性 ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.feature-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px 28px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--gold);
    transition: all var(--transition);
}
.feature-card:hover {
    border-left-color: var(--coral);
    transform: translateX(4px);
}
.feature-icon {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    font-size: 24px;
}
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--gray); line-height: 1.7; }

/* ===== 评价 ===== */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.review-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 24px 20px;
    box-shadow: var(--shadow);
    border-top: 3px solid var(--gold);
    transition: all var(--transition);
}
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.review-stars { color: var(--gold); font-size: 16px; margin-bottom: 10px; }
.review-text {
    font-size: 14px;
    color: #4a5568;
    line-height: 1.7;
    margin-bottom: 16px;
    font-style: italic;
}
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 16px;
    font-weight: 700;
    flex-shrink: 0;
}
.review-name { font-size: 14px; font-weight: 600; }
.review-date { font-size: 12px; color: var(--gray); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    border-bottom: 1px solid var(--border);
    overflow: hidden;
}
.faq-q {
    width: 100%;
    background: none;
    border: none;
    text-align: left;
    padding: 20px 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    transition: color var(--transition);
}
.faq-q:hover { color: var(--primary-light); }
.faq-q .faq-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--light-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
    transition: all var(--transition);
    color: var(--primary);
}
.faq-item.open .faq-q .faq-icon {
    background: var(--primary);
    color: var(--white);
    transform: rotate(45deg);
}
.faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    font-size: 15px;
    color: #4a5568;
    line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; padding-bottom: 20px; }

/* ===== 合作品牌 ===== */
.partners-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    align-items: center;
}
.partner-item {
    background: var(--white);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 28px;
    font-size: 15px;
    font-weight: 600;
    color: var(--gray);
    transition: all var(--transition);
}
.partner-item:hover {
    border-color: var(--gold);
    color: var(--primary);
    transform: translateY(-2px);
}

/* ===== 联系我们 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}
.contact-info h3 { font-size: 22px; font-weight: 700; margin-bottom: 20px; }
.contact-item {
    display: flex;
    gap: 14px;
    margin-bottom: 18px;
    align-items: flex-start;
}
.contact-icon {
    width: 44px;
    height: 44px;
    background: var(--light-bg);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}
.contact-label { font-size: 12px; color: var(--gray); margin-bottom: 2px; }
.contact-value { font-size: 15px; font-weight: 600; }
.qrcode-row {
    display: flex;
    gap: 24px;
    margin-top: 24px;
}
.qrcode-item { text-align: center; }
.qrcode-item img {
    width: 120px;
    height: 120px;
    border-radius: 10px;
    border: 2px solid var(--border);
    margin-bottom: 8px;
}
.qrcode-item p { font-size: 12px; color: var(--gray); }

/* ===== 社区入口 ===== */
.community-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.community-card {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    color: var(--white);
    transition: all var(--transition);
    cursor: pointer;
}
.community-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(10,30,80,0.25); }
.community-card .icon { font-size: 36px; margin-bottom: 12px; }
.community-card h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.community-card p { font-size: 13px; opacity: 0.8; }

/* ===== 分享按钮 ===== */
.share-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 24px;
}
.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 24px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    color: var(--white);
}
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #161823; }
.share-bilibili { background: #00a1d6; }
.share-btn:hover { opacity: 0.88; transform: translateY(-2px); }

/* ===== 面包屑 ===== */
.breadcrumb {
    padding: 14px 0;
    font-size: 13px;
    color: var(--gray);
}
.breadcrumb a { color: var(--gray); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ===== 页脚 ===== */
.site-footer {
    background: var(--primary);
    color: rgba(255,255,255,0.8);
    padding: 60px 0 0;
    margin-top: 80px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}
.footer-brand img { height: 40px; }
.footer-brand p { font-size: 14px; line-height: 1.8; opacity: 0.75; max-width: 280px; }
.footer-col h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 18px;
}
.footer-col ul li {
    margin-bottom: 10px;
}
.footer-col ul li a {
    font-size: 14px;
    opacity: 0.75;
    transition: opacity var(--transition);
}
.footer-col ul li a:hover { opacity: 1; color: var(--gold-light); }
.footer-bottom {
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    opacity: 0.65;
}
.footer-logo-bottom { display: flex; align-items: center; gap: 10px; }
.footer-logo-bottom img { height: 32px; }

/* ===== 通用区块间距 ===== */
.section { padding: 80px 0; }
.section-alt { background: var(--light-bg); }
.section-dark { background: var(--primary); color: var(--white); }
.section-dark .section-header h2 { color: var(--white); }
.section-dark .section-header p { color: rgba(255,255,255,0.7); }

/* ===== 标签 ===== */
.tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    background: var(--light-bg);
    color: var(--primary-light);
}

/* ===== 内页 Hero ===== */
.page-hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    padding: 60px 0;
    color: var(--white);
    text-align: center;
}
.page-hero h1 { font-size: 40px; font-weight: 900; margin-bottom: 12px; }
.page-hero p { font-size: 16px; opacity: 0.85; max-width: 600px; margin: 0 auto; }

/* ===== 文章内容 ===== */
.article-content {
    font-size: 16px;
    line-height: 1.9;
    color: #2d3748;
}
.article-content h2 { font-size: 24px; font-weight: 700; margin: 32px 0 14px; color: var(--primary); }
.article-content h3 { font-size: 20px; font-weight: 600; margin: 24px 0 10px; }
.article-content p { margin-bottom: 16px; }

/* ===== 响应式 ===== */
@media (max-width: 1100px) {
    .video-grid, .photo-grid { grid-template-columns: repeat(3, 1fr); }
    .expert-grid { grid-template-columns: repeat(3, 1fr); }
    .reviews-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 768px) {
    .hero-content h1 { font-size: 32px; }
    .video-grid, .photo-grid { grid-template-columns: repeat(2, 1fr); }
    .expert-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: 1fr; }
    .community-cards { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .main-nav { display: none; }
    .main-nav.open { display: block; }
    .main-nav.open ul { flex-direction: column; padding: 16px 0; }
    .menu-toggle { display: flex; }
    .header-search { min-width: 140px; }
    .hero-stats { position: static; margin-top: 32px; justify-content: flex-start; }
    .section { padding: 52px 0; }
    .section-header h2 { font-size: 26px; }
}
@media (max-width: 480px) {
    .video-grid, .photo-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
    .reviews-grid { grid-template-columns: 1fr; }
    .expert-grid { grid-template-columns: 1fr 1fr; }
    .community-cards { grid-template-columns: 1fr 1fr; }
    .hero-content h1 { font-size: 26px; }
    .container { padding: 0 14px; }
}

/* ===== 懒加载占位 ===== */
img[data-src] { background: var(--light-bg); }

/* ===== 滚动动画 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: none; }

/* ===== 视频模态框 ===== */
.video-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.88);
    z-index: 9999;
    align-items: center;
    justify-content: center;
}
.video-modal.active { display: flex; }
.video-modal-inner {
    background: #000;
    border-radius: var(--radius);
    width: 90%;
    max-width: 860px;
    aspect-ratio: 16/9;
    position: relative;
    overflow: hidden;
}
.video-modal video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.modal-close {
    position: absolute;
    top: 14px;
    right: 14px;
    background: rgba(255,255,255,0.2);
    border: none;
    color: #fff;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
    z-index: 10;
}
.modal-close:hover { background: rgba(255,255,255,0.35); }