/* ================================================
   抖阴植物视频社区 - 主样式文件
   域名: bdnukf.cn
   ================================================ */

:root {
    --primary: #2d7a2d;
    --primary-dark: #1a5c1a;
    --primary-light: #4caf50;
    --accent: #8bc34a;
    --accent2: #ff9800;
    --text-dark: #1a1a1a;
    --text-gray: #555;
    --text-light: #888;
    --bg-light: #f5f9f2;
    --bg-white: #ffffff;
    --border: #dde8d0;
    --shadow: 0 4px 20px rgba(45,122,45,0.10);
    --shadow-hover: 0 8px 32px rgba(45,122,45,0.18);
    --radius: 12px;
    --radius-sm: 6px;
    --transition: all 0.3s ease;
}

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

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-dark);
    background: var(--bg-white);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ===== 隐藏干扰标签 ===== */
.noise-wrap { display: none !important; }

/* ===== 链接 ===== */
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-light); }

img { max-width: 100%; height: auto; display: block; }

/* ===== 容器 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 0 20px; }

/* ===== 顶部公告栏 ===== */
.top-bar {
    background: var(--primary-dark);
    color: #fff;
    font-size: 13px;
    padding: 6px 0;
    text-align: center;
}
.top-bar a { color: #c8e6c9; }
.top-bar a:hover { color: #fff; }

/* ===== 头部导航 ===== */
.site-header {
    background: #fff;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
    gap: 20px;
}
.logo-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #fff;
    font-weight: 900;
    letter-spacing: -1px;
    box-shadow: 0 2px 8px rgba(45,122,45,0.3);
}
.logo-text { line-height: 1.2; }
.logo-text .brand { font-size: 22px; font-weight: 800; color: var(--primary); letter-spacing: 1px; }
.logo-text .slogan { font-size: 11px; color: var(--text-light); }

/* ===== 主导航 ===== */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    white-space: nowrap;
    transition: var(--transition);
}
.main-nav a:hover, .main-nav a.active {
    background: var(--bg-light);
    color: var(--primary);
}
.main-nav .nav-hot {
    background: var(--primary);
    color: #fff !important;
    border-radius: 20px;
    padding: 6px 16px;
}
.main-nav .nav-hot:hover { background: var(--primary-dark); }

/* ===== 搜索框 ===== */
.search-bar {
    background: var(--bg-light);
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
}
.search-inner {
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 700px;
    margin: 0 auto;
}
.search-form {
    display: flex;
    flex: 1;
    border: 2px solid var(--primary);
    border-radius: 30px;
    overflow: hidden;
    background: #fff;
}
.search-form input {
    flex: 1;
    border: none;
    outline: none;
    padding: 9px 18px;
    font-size: 14px;
    background: transparent;
    color: var(--text-dark);
}
.search-form button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 9px 22px;
    font-size: 14px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}
.search-form button:hover { background: var(--primary-dark); }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-tags span {
    font-size: 12px;
    color: var(--text-light);
}
.search-tags a {
    font-size: 12px;
    color: var(--primary);
    background: #e8f5e9;
    padding: 2px 10px;
    border-radius: 20px;
}
.search-tags a:hover { background: var(--primary); color: #fff; }

/* ===== 面包屑 ===== */
.breadcrumb {
    background: var(--bg-light);
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-light);
}
.breadcrumb a { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ===== Banner ===== */
.hero-banner {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--primary-dark);
}
.hero-banner .banner-bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.55;
}
.hero-banner .banner-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26,92,26,0.82) 0%, rgba(45,122,45,0.55) 60%, rgba(0,0,0,0.3) 100%);
}
.hero-content {
    position: relative;
    z-index: 2;
    color: #fff;
    max-width: 700px;
    padding: 60px 0;
}
.hero-content .brand-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 30px;
    padding: 6px 16px;
    font-size: 13px;
    margin-bottom: 20px;
    backdrop-filter: blur(4px);
}
.hero-content h1 {
    font-size: 52px;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 16px;
    text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}
.hero-content h1 em {
    font-style: normal;
    color: #a5d6a7;
}
.hero-content .hero-desc {
    font-size: 17px;
    line-height: 1.8;
    opacity: 0.92;
    margin-bottom: 28px;
    max-width: 560px;
}
.hero-content .hero-desc a { color: #a5d6a7; font-weight: 600; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 28px;
    border-radius: 30px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-decoration: none;
}
.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 16px rgba(139,195,74,0.4);
}
.btn-primary:hover { background: #7cb342; transform: translateY(-2px); color: #fff; }
.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.6);
}
.btn-outline:hover { background: rgba(255,255,255,0.15); color: #fff; }
.hero-stats {
    display: flex;
    gap: 32px;
    margin-top: 36px;
    padding-top: 28px;
    border-top: 1px solid rgba(255,255,255,0.2);
}
.hero-stat .num { font-size: 28px; font-weight: 800; color: #a5d6a7; }
.hero-stat .label { font-size: 12px; opacity: 0.8; margin-top: 2px; }

/* ===== 通用区块 ===== */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-light); }
.section-header { text-align: center; margin-bottom: 44px; }
.section-header .tag {
    display: inline-block;
    background: #e8f5e9;
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 12px;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.section-header h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 10px;
}
.section-header h2 em { font-style: normal; color: var(--primary); }
.section-header p { font-size: 15px; color: var(--text-gray); max-width: 560px; margin: 0 auto; }

/* ===== 视频卡片 ===== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.video-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: 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: #1a1a1a;
}
.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); }
.play-btn {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.0);
    transition: var(--transition);
    opacity: 0;
}
.video-card:hover .play-btn { opacity: 1; background: rgba(0,0,0,0.35); }
.play-btn-icon {
    width: 60px;
    height: 60px;
    background: rgba(255,255,255,0.92);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: scale(0.8);
    transition: transform 0.3s ease;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.video-card:hover .play-btn-icon { transform: scale(1); }
.play-btn-icon::after {
    content: '';
    border-left: 22px solid var(--primary);
    border-top: 13px solid transparent;
    border-bottom: 13px solid transparent;
    margin-left: 4px;
}
.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
}
.video-quality {
    position: absolute;
    top: 8px;
    left: 8px;
    background: var(--primary);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
}
.video-info { padding: 14px 16px; }
.video-info h3 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 6px;
    line-height: 1.4;
    color: var(--text-dark);
    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(--text-light);
    margin-bottom: 8px;
}
.video-meta .author { color: var(--primary); font-weight: 600; }
.video-stats {
    display: flex;
    gap: 14px;
    font-size: 12px;
    color: var(--text-light);
}
.video-stats span { display: flex; align-items: center; gap: 3px; }
.video-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.video-tag {
    font-size: 11px;
    background: #e8f5e9;
    color: var(--primary);
    padding: 2px 8px;
    border-radius: 20px;
}

/* ===== 大视频卡片 ===== */
.video-featured {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    margin-bottom: 28px;
}
.video-featured .video-card .video-info h3 { font-size: 17px; }

/* ===== 专家卡片 ===== */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}
.expert-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.expert-avatar {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
}
.expert-body { padding: 20px 16px; }
.expert-body h3 { font-size: 18px; font-weight: 800; margin-bottom: 4px; }
.expert-body .title {
    font-size: 13px;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 10px;
}
.expert-body p { font-size: 13px; color: var(--text-gray); line-height: 1.6; margin-bottom: 14px; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 14px; }
.expert-tag {
    font-size: 11px;
    background: #e8f5e9;
    color: var(--primary);
    padding: 3px 10px;
    border-radius: 20px;
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
    padding: 7px 16px;
    font-size: 13px;
    border-radius: 20px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}
.btn-green { background: var(--primary); color: #fff; }
.btn-green:hover { background: var(--primary-dark); color: #fff; }
.btn-ghost { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-ghost:hover { background: var(--primary); color: #fff; }

/* ===== 功能模块卡片 ===== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}
.feature-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 28px 22px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 4px solid var(--primary);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feature-icon { font-size: 36px; margin-bottom: 14px; }
.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: var(--text-dark); }
.feature-card p { font-size: 13px; color: var(--text-gray); line-height: 1.6; }

/* ===== 合作品牌 ===== */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
}
.partner-card {
    background: #fff;
    border-radius: var(--radius-sm);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1.5px solid var(--border);
}
.partner-card:hover { border-color: var(--primary); box-shadow: var(--shadow-hover); }
.partner-logo { font-size: 32px; margin-bottom: 8px; }
.partner-name { font-size: 13px; font-weight: 700; color: var(--text-dark); }
.partner-desc { font-size: 11px; color: var(--text-light); margin-top: 4px; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    background: #fff;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid var(--border);
}
.faq-q {
    padding: 18px 22px;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-dark);
    transition: var(--transition);
}
.faq-q:hover { color: var(--primary); }
.faq-q .arrow {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: transform 0.3s;
    flex-shrink: 0;
}
.faq-item.open .faq-q .arrow { transform: rotate(180deg); }
.faq-a {
    display: none;
    padding: 0 22px 18px;
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
    border-top: 1px solid var(--border);
    padding-top: 14px;
}
.faq-item.open .faq-a { display: block; }

/* ===== 用户评论 ===== */
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}
.review-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    border-top: 3px solid var(--primary);
    transition: var(--transition);
}
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
    font-weight: 800;
    flex-shrink: 0;
}
.review-user .name { font-size: 15px; font-weight: 700; }
.review-user .info { font-size: 12px; color: var(--text-light); }
.review-stars { color: #ffc107; font-size: 14px; margin-bottom: 10px; }
.review-text { font-size: 14px; color: var(--text-gray); line-height: 1.7; }
.review-date { font-size: 12px; color: var(--text-light); margin-top: 10px; }

/* ===== 联系信息 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}
.contact-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    text-align: center;
}
.contact-icon { font-size: 40px; margin-bottom: 12px; }
.contact-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.contact-card p { font-size: 14px; color: var(--text-gray); }
.qr-code {
    width: 100px;
    height: 100px;
    background: #f0f0f0;
    border: 2px solid var(--border);
    border-radius: 8px;
    margin: 10px auto;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    color: var(--text-light);
    overflow: hidden;
}
.qr-code canvas { width: 100% !important; height: 100% !important; }

/* ===== AI赋能区块 ===== */
.ai-section {
    background: linear-gradient(135deg, #1a3a1a 0%, #2d7a2d 50%, #1a5c1a 100%);
    color: #fff;
    padding: 64px 0;
}
.ai-section .section-header .tag { background: rgba(255,255,255,0.15); color: #a5d6a7; }
.ai-section .section-header h2 { color: #fff; }
.ai-section .section-header p { color: rgba(255,255,255,0.8); }
.ai-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.ai-card {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--radius);
    padding: 28px 22px;
    backdrop-filter: blur(8px);
    transition: var(--transition);
}
.ai-card:hover { background: rgba(255,255,255,0.18); transform: translateY(-4px); }
.ai-card .icon { font-size: 40px; margin-bottom: 16px; }
.ai-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: #fff; }
.ai-card p { font-size: 14px; color: rgba(255,255,255,0.8); line-height: 1.7; }

/* ===== 社区区块 ===== */
.community-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}
.tab-btn {
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: 1.5px solid var(--border);
    background: #fff;
    color: var(--text-gray);
    transition: var(--transition);
}
.tab-btn.active, .tab-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ===== 社交分享 ===== */
.share-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}
.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-decoration: none;
}
.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #010101; color: #fff; }
.share-bilibili { background: #00a1d6; color: #fff; }
.share-btn:hover { opacity: 0.85; transform: translateY(-2px); color: #fff; }

/* ===== 页脚 ===== */
.site-footer {
    background: #111;
    color: rgba(255,255,255,0.7);
    padding: 48px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo-text .brand { color: #a5d6a7; }
.footer-brand .logo-text .slogan { color: rgba(255,255,255,0.5); }
.footer-desc { font-size: 13px; line-height: 1.8; margin: 14px 0; color: rgba(255,255,255,0.6); }
.footer-col h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 14px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 13px; color: rgba(255,255,255,0.6); }
.footer-col ul li a:hover { color: var(--accent); }
.footer-qr { display: flex; gap: 16px; margin-top: 14px; }
.footer-qr-item { text-align: center; }
.footer-qr-item .qr-box {
    width: 80px;
    height: 80px;
    background: #fff;
    border-radius: 6px;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.footer-qr-item .qr-box canvas { width: 80px !important; height: 80px !important; }
.footer-qr-item span { font-size: 11px; color: rgba(255,255,255,0.5); }
.footer-bottom {
    padding: 18px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 12px;
    color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--accent); }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }

/* ===== 侧边栏 ===== */
.sidebar { display: flex; flex-direction: column; gap: 24px; }
.sidebar-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}
.sidebar-card h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary);
    color: var(--text-dark);
}
.sidebar-list li {
    list-style: none;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}
.sidebar-list li:last-child { border-bottom: none; }
.sidebar-list li a { color: var(--text-dark); }
.sidebar-list li a:hover { color: var(--primary); }
.sidebar-list li .num { float: right; color: var(--text-light); font-size: 12px; }

/* ===== 内容布局 ===== */
.content-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 32px;
    align-items: start;
}

/* ===== 加入社区 ===== */
.join-steps {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    counter-reset: step;
}
.join-step {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px 20px;
    box-shadow: var(--shadow);
    text-align: center;
    position: relative;
}
.join-step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 28px;
}
.join-step .icon { font-size: 36px; margin: 10px 0 12px; }
.join-step h3 { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.join-step p { font-size: 13px; color: var(--text-gray); }

/* ===== 统计数字 ===== */
.stats-bar {
    background: var(--primary);
    color: #fff;
    padding: 32px 0;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    text-align: center;
}
.stat-item .num { font-size: 36px; font-weight: 900; color: #a5d6a7; }
.stat-item .label { font-size: 13px; opacity: 0.85; margin-top: 4px; }

/* ===== 标签云 ===== */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.cloud-tag {
    display: inline-block;
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 13px;
    background: #e8f5e9;
    color: var(--primary);
    transition: var(--transition);
    cursor: pointer;
}
.cloud-tag:hover { background: var(--primary); color: #fff; }
.cloud-tag.lg { font-size: 15px; padding: 7px 18px; }
.cloud-tag.sm { font-size: 11px; padding: 3px 10px; }

/* ===== 通知提示 ===== */
.notice-bar {
    background: #fff3e0;
    border-left: 4px solid var(--accent2);
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: #e65100;
    margin-bottom: 20px;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .content-layout { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .hero-content h1 { font-size: 34px; }
    .hero-stats { gap: 20px; }
    .hero-stat .num { font-size: 22px; }
    .main-nav { display: none; }
    .mobile-menu-btn { display: flex; }
    .video-featured { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .section { padding: 40px 0; }
    .section-header h2 { font-size: 24px; }
}
@media (max-width: 480px) {
    .hero-content h1 { font-size: 26px; }
    .hero-btns { flex-direction: column; }
    .btn { justify-content: center; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .search-inner { flex-direction: column; }
}

/* ===== 汉堡菜单 ===== */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 6px;
}
.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}
.mobile-nav {
    display: none;
    background: #fff;
    border-top: 1px solid var(--border);
    padding: 16px 0;
}
.mobile-nav.open { display: block; }
.mobile-nav a {
    display: block;
    padding: 10px 20px;
    font-size: 15px;
    color: var(--text-dark);
    border-bottom: 1px solid var(--border);
}
.mobile-nav a:hover { color: var(--primary); background: var(--bg-light); }

/* ===== 懒加载占位 ===== */
.lazy-placeholder {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ===== 滚动动画 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== 视频播放模态框 ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    z-index: 9999;
    align-items: center;
    justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal-box {
    background: #111;
    border-radius: var(--radius);
    width: 90%;
    max-width: 800px;
    overflow: hidden;
    position: relative;
}
.modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    background: rgba(255,255,255,0.2);
    border: none;
    border-radius: 50%;
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: var(--transition);
}
.modal-close:hover { background: rgba(255,255,255,0.35); }
.modal-video {
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.5);
    font-size: 14px;
}
.modal-info { padding: 16px 20px; color: #fff; }
.modal-info h3 { font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.modal-info p { font-size: 13px; color: rgba(255,255,255,0.6); }

/* ===== 回到顶部 ===== */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(45,122,45,0.4);
    transition: var(--transition);
    opacity: 0;
    pointer-events: none;
    border: none;
    font-size: 18px;
    z-index: 500;
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* ===== 内页标题 ===== */
.page-hero {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: #fff;
    padding: 48px 0;
    text-align: center;
}
.page-hero h1 { font-size: 36px; font-weight: 900; margin-bottom: 10px; }
.page-hero p { font-size: 15px; opacity: 0.85; }

/* ===== 分页 ===== */
.pagination {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-top: 40px;
    flex-wrap: wrap;
}
.page-btn {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    border: 1.5px solid var(--border);
    background: #fff;
    color: var(--text-dark);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    text-decoration: none;
}
.page-btn:hover, .page-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ===== 表格 ===== */
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th {
    background: var(--primary);
    color: #fff;
    padding: 12px 16px;
    text-align: left;
    font-weight: 700;
}
.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text-gray);
}
.data-table tr:hover td { background: var(--bg-light); }

/* ===== 文章内容 ===== */
.article-content { line-height: 1.9; color: var(--text-dark); }
.article-content h2 { font-size: 22px; font-weight: 800; margin: 28px 0 14px; color: var(--primary-dark); }
.article-content h3 { font-size: 18px; font-weight: 700; margin: 22px 0 10px; }
.article-content p { margin-bottom: 16px; font-size: 15px; }
.article-content ul, .article-content ol { margin: 14px 0 14px 24px; }
.article-content li { margin-bottom: 8px; font-size: 15px; }

/* ===== 更新时间 ===== */
.update-time { font-size: 12px; color: var(--text-light); }