/* ============================================================
   每日大赛 - 主样式表 | hnhhhtn.cn
   原创设计，版权所有 © 2026 每日大赛传媒有限公司
   ============================================================ */

/* ---- CSS变量 ---- */
:root {
  --primary: #1a2c5b;
  --primary-light: #2a4080;
  --accent: #d4a017;
  --accent-light: #f0c040;
  --red: #c0392b;
  --green: #1a6b3c;
  --purple: #6b21a8;
  --bg: #f5f7fa;
  --bg-dark: #0f1e3d;
  --text: #1a1a2e;
  --text-muted: #666;
  --border: #e2e8f0;
  --white: #ffffff;
  --shadow: 0 4px 20px rgba(26,44,91,0.1);
  --shadow-lg: 0 8px 40px rgba(26,44,91,0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
}

/* ---- 重置 ---- */
*, *::before, *::after { 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); background: var(--white); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
h1,h2,h3,h4,h5,h6 { font-weight: 700; line-height: 1.3; color: var(--primary); }
p { margin-bottom: 1em; }
p:last-child { margin-bottom: 0; }

/* ---- 布局 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ---- 顶部公告栏 ---- */
.top-bar { background: var(--primary); color: rgba(255,255,255,0.85); font-size: 0.78rem; padding: 6px 0; overflow: hidden; }
.top-bar .container { display: flex; align-items: center; gap: 8px; white-space: nowrap; overflow: hidden; }
.top-bar a { color: var(--accent-light); }
.top-bar a:hover { color: #fff; }

/* ---- 主导航 ---- */
.site-header { background: var(--white); box-shadow: 0 2px 12px rgba(26,44,91,0.08); position: sticky; top: 0; z-index: 1000; }
.header-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; height: 64px; }
.site-logo { display: flex; align-items: center; gap: 10px; }
.site-logo img { width: 36px; height: 36px; border-radius: 8px; object-fit: contain; }
.logo-text { display: flex; flex-direction: column; }
.logo-name { font-size: 1.1rem; font-weight: 800; color: var(--primary); line-height: 1.2; letter-spacing: 0.02em; }
.logo-slogan { font-size: 0.65rem; color: var(--text-muted); letter-spacing: 0.05em; }
.main-nav ul { display: flex; align-items: center; gap: 4px; }
.main-nav a { padding: 8px 14px; border-radius: 20px; font-size: 0.88rem; font-weight: 600; color: var(--text); transition: var(--transition); }
.main-nav a:hover, .main-nav a.active { background: var(--primary); color: var(--white); }
.main-nav a.nav-cta { background: var(--accent); color: var(--primary); }
.main-nav a.nav-cta:hover { background: var(--accent-light); }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; background: none; border: none; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--primary); border-radius: 2px; transition: var(--transition); }

/* ---- 搜索栏 ---- */
.search-bar-wrap { background: var(--bg); border-bottom: 1px solid var(--border); padding: 10px 0 8px; }
.search-bar-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.search-bar-inner form { display: flex; gap: 8px; margin-bottom: 8px; }
.search-bar-inner input { flex: 1; padding: 9px 16px; border: 2px solid var(--border); border-radius: 24px; font-size: 0.88rem; outline: none; transition: var(--transition); background: var(--white); }
.search-bar-inner input:focus { border-color: var(--primary); }
.search-bar-inner button { padding: 9px 24px; background: var(--primary); color: var(--white); border: none; border-radius: 24px; font-size: 0.88rem; font-weight: 600; cursor: pointer; transition: var(--transition); }
.search-bar-inner button:hover { background: var(--primary-light); }
.search-hot-tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 0.78rem; color: var(--text-muted); }
.search-hot-tags a { color: var(--primary); background: var(--white); border: 1px solid var(--border); padding: 3px 10px; border-radius: 12px; font-size: 0.75rem; }
.search-hot-tags a:hover { background: var(--primary); color: var(--white); border-color: var(--primary); }

/* ---- 通知条 ---- */
.notice-bar { background: linear-gradient(90deg, var(--primary), var(--primary-light)); color: var(--white); padding: 8px 0; overflow: hidden; }
.notice-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; gap: 12px; }
.notice-tag { background: var(--accent); color: var(--primary); padding: 2px 10px; border-radius: 12px; font-size: 0.75rem; font-weight: 700; white-space: nowrap; }
.notice-scroll { overflow: hidden; flex: 1; }
.notice-text { display: inline-block; white-space: nowrap; font-size: 0.82rem; animation: scrollLeft 30s linear infinite; }
@keyframes scrollLeft { 0% { transform: translateX(100%); } 100% { transform: translateX(-100%); } }

/* ---- 英雄区 ---- */
.hero-section { position: relative; overflow: hidden; }
.hero-slider { position: relative; height: 520px; }
.hero-slide { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: 0; transition: opacity 0.8s ease; }
.hero-slide.active { opacity: 1; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,30,61,0.85) 0%, rgba(26,44,91,0.6) 50%, rgba(0,0,0,0.3) 100%); }
.hero-content { position: relative; z-index: 2; max-width: 1200px; margin: 0 auto; padding: 0 20px; height: 100%; display: flex; flex-direction: column; justify-content: center; }
.hero-badge { display: inline-block; background: var(--accent); color: var(--primary); padding: 4px 14px; border-radius: 20px; font-size: 0.78rem; font-weight: 700; margin-bottom: 16px; width: fit-content; }
.hero-title { font-size: 3rem; color: var(--white); line-height: 1.2; margin-bottom: 16px; text-shadow: 0 2px 8px rgba(0,0,0,0.3); }
.hero-title em { color: var(--accent-light); font-style: normal; }
.hero-desc { font-size: 1rem; color: rgba(255,255,255,0.85); max-width: 560px; margin-bottom: 28px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-dots { position: absolute; bottom: 80px; left: 50%; transform: translateX(-50%); display: flex; gap: 8px; z-index: 3; }
.hero-dots span { width: 8px; height: 8px; border-radius: 50%; background: rgba(255,255,255,0.4); cursor: pointer; transition: var(--transition); }
.hero-dots span.active { background: var(--accent); width: 24px; border-radius: 4px; }
.hero-stats { position: absolute; bottom: 0; left: 0; right: 0; background: rgba(15,30,61,0.9); backdrop-filter: blur(8px); display: flex; justify-content: center; gap: 0; z-index: 3; }
.hero-stat { padding: 16px 40px; text-align: center; border-right: 1px solid rgba(255,255,255,0.1); }
.hero-stat:last-child { border-right: none; }
.hero-stat-num { font-size: 1.4rem; font-weight: 800; color: var(--accent-light); }
.hero-stat-label { font-size: 0.75rem; color: rgba(255,255,255,0.6); margin-top: 2px; }

/* ---- 按钮 ---- */
.btn-primary { display: inline-flex; align-items: center; gap: 6px; padding: 12px 28px; background: var(--accent); color: var(--primary); border-radius: 28px; font-weight: 700; font-size: 0.9rem; transition: var(--transition); border: none; cursor: pointer; }
.btn-primary:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: 0 4px 16px rgba(212,160,23,0.4); color: var(--primary); }
.btn-outline { display: inline-flex; align-items: center; gap: 6px; padding: 12px 28px; background: transparent; color: var(--white); border: 2px solid rgba(255,255,255,0.6); border-radius: 28px; font-weight: 600; font-size: 0.9rem; transition: var(--transition); }
.btn-outline:hover { background: rgba(255,255,255,0.15); border-color: var(--white); color: var(--white); }
.btn-sm { padding: 7px 16px; border-radius: 20px; font-size: 0.8rem; font-weight: 600; transition: var(--transition); display: inline-block; }
.btn-sm-primary { background: var(--primary); color: var(--white); }
.btn-sm-primary:hover { background: var(--primary-light); color: var(--white); }
.btn-sm-outline { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-sm-outline:hover { background: var(--primary); color: var(--white); }

/* ---- 数据统计 ---- */
.stats-section { background: var(--primary); padding: 20px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.stat-item { text-align: center; padding: 20px; border-right: 1px solid rgba(255,255,255,0.1); }
.stat-item:last-child { border-right: none; }
.stat-num { font-size: 1.8rem; font-weight: 800; color: var(--accent-light); }
.stat-label { font-size: 0.78rem; color: rgba(255,255,255,0.6); margin-top: 4px; }

/* ---- 通用区块 ---- */
.section { padding: 72px 0; }
.section-alt { background: var(--bg); }
.section-dark { background: var(--bg-dark); }
.section-dark .section-title, .section-dark .section-subtitle { color: var(--white); }
.section-dark .section-subtitle { color: rgba(255,255,255,0.7); }
.section-title { font-size: 1.8rem; text-align: center; margin-bottom: 12px; position: relative; }
.section-title::after { content: ''; display: block; width: 48px; height: 3px; background: var(--accent); margin: 12px auto 0; border-radius: 2px; }
.section-subtitle { text-align: center; color: var(--text-muted); font-size: 0.95rem; max-width: 640px; margin: 0 auto 40px; }

/* ---- 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: var(--transition); cursor: pointer; }
.video-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.video-card.animate-in { animation: fadeInUp 0.5s ease forwards; }
.video-thumb { position: relative; aspect-ratio: 16/9; overflow: hidden; background: #111; }
.video-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-play-btn { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; background: rgba(0,0,0,0); transition: var(--transition); }
.video-card:hover .video-play-btn { background: rgba(0,0,0,0.45); }
.play-icon { width: 48px; height: 48px; background: rgba(255,255,255,0.9); border-radius: 50%; display: flex; align-items: center; justify-content: center; opacity: 0; transform: scale(0.8); transition: var(--transition); }
.play-icon svg { width: 22px; height: 22px; fill: var(--primary); margin-left: 3px; }
.video-card:hover .play-icon { opacity: 1; transform: scale(1); }
.video-duration { position: absolute; bottom: 8px; right: 8px; background: rgba(0,0,0,0.75); color: #fff; font-size: 0.72rem; padding: 2px 7px; border-radius: 4px; }
.video-tag { position: absolute; top: 8px; left: 8px; background: var(--accent); color: var(--primary); font-size: 0.7rem; font-weight: 700; padding: 2px 8px; border-radius: 4px; }
.video-info { padding: 12px 14px 14px; }
.video-title { font-size: 0.88rem; font-weight: 600; color: var(--text); line-height: 1.4; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-meta { display: flex; gap: 12px; font-size: 0.75rem; color: var(--text-muted); }
.video-meta span { display: flex; align-items: center; gap: 3px; }
.video-meta svg { width: 12px; height: 12px; fill: currentColor; }

/* ---- 功能卡片 ---- */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.feature-card { background: var(--white); border-radius: var(--radius); padding: 28px 20px; box-shadow: var(--shadow); transition: var(--transition); border-top: 3px solid transparent; }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-top-color: var(--accent); }
.feature-card.animate-in { animation: fadeInUp 0.5s ease forwards; }
.feature-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 16px; }
.feature-icon-blue { background: rgba(26,44,91,0.1); }
.feature-icon-gold { background: rgba(212,160,23,0.15); }
.feature-icon-purple { background: rgba(107,33,168,0.1); }
.feature-icon-green { background: rgba(26,107,60,0.1); }
.feature-title { font-size: 1rem; font-weight: 700; color: var(--primary); margin-bottom: 10px; }
.feature-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }

/* ---- 社区卡片 ---- */
.community-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.community-card { background: linear-gradient(135deg, var(--primary), var(--primary-light)); border-radius: var(--radius); padding: 28px; color: var(--white); transition: var(--transition); cursor: pointer; }
.community-card:hover { transform: translateY(-4px) scale(1.02); box-shadow: var(--shadow-lg); }
.community-card-icon { font-size: 2.2rem; margin-bottom: 14px; }
.community-card-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.community-card-desc { font-size: 0.85rem; color: rgba(255,255,255,0.75); }

/* ---- AI卡片 ---- */
.ai-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.ai-card { background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius); padding: 32px 24px; transition: var(--transition); }
.ai-card:hover { background: rgba(255,255,255,0.1); border-color: var(--accent); transform: translateY(-4px); }
.ai-card.animate-in { animation: fadeInUp 0.5s ease forwards; }
.ai-card-icon { font-size: 2.5rem; margin-bottom: 16px; }
.ai-card-title { font-size: 1.1rem; font-weight: 700; color: var(--accent-light); margin-bottom: 12px; }
.ai-card-desc { font-size: 0.88rem; color: rgba(255,255,255,0.7); line-height: 1.7; }

/* ---- 专家卡片 ---- */
.expert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.expert-card { background: var(--white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.expert-card.animate-in { animation: fadeInUp 0.5s ease forwards; }
.expert-photo { width: 100%; aspect-ratio: 1/1; object-fit: cover; object-position: top; }
.expert-info { padding: 20px; }
.expert-name { font-size: 1.1rem; font-weight: 800; color: var(--primary); margin-bottom: 4px; }
.expert-role { font-size: 0.82rem; color: var(--accent); font-weight: 600; margin-bottom: 10px; }
.expert-bio { font-size: 0.83rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 12px; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.expert-tag { background: var(--bg); color: var(--primary); font-size: 0.72rem; padding: 3px 10px; border-radius: 12px; font-weight: 600; }
.expert-btns { display: flex; gap: 8px; }

/* ---- 合作品牌 ---- */
.partner-logos { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.partner-logo { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 20px; text-align: center; font-weight: 700; color: var(--primary); font-size: 0.9rem; transition: var(--transition); }
.partner-logo:hover { background: var(--primary); color: var(--white); border-color: var(--primary); transform: translateY(-2px); }

/* ---- 步骤引导 ---- */
.howto-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.howto-step { text-align: center; padding: 28px 16px; background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); transition: var(--transition); }
.howto-step:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.step-num { width: 52px; height: 52px; background: var(--primary); color: var(--white); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; font-weight: 800; margin: 0 auto 16px; }
.step-title { font-size: 1rem; font-weight: 700; color: var(--primary); margin-bottom: 10px; }
.step-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }

/* ---- 联系区 ---- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info-block { background: var(--white); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.contact-info-block h2 { font-size: 1.3rem; margin-bottom: 24px; }
.contact-item { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 18px; padding-bottom: 18px; border-bottom: 1px solid var(--border); }
.contact-item:last-of-type { border-bottom: none; }
.contact-icon { width: 36px; height: 36px; background: var(--bg); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 1rem; flex-shrink: 0; }
.contact-label { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 0.9rem; font-weight: 600; color: var(--text); }
.qr-codes { display: flex; gap: 20px; }
.qr-item { text-align: center; }
.qr-item img { width: 90px; height: 90px; border-radius: 8px; border: 1px solid var(--border); }
.qr-label { font-size: 0.72rem; color: var(--text-muted); margin-top: 6px; }
.community-entry-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.community-entry { background: var(--bg); border-radius: var(--radius-sm); padding: 14px; display: flex; align-items: center; gap: 10px; transition: var(--transition); cursor: pointer; }
.community-entry:hover { background: var(--primary); color: var(--white); }
.community-entry-icon { font-size: 1.2rem; }
.community-entry-title { font-size: 0.82rem; font-weight: 600; }

/* ---- 联系表单 ---- */
.contact-form { background: var(--white); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.contact-form h2 { font-size: 1.3rem; margin-bottom: 24px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 10px 14px; border: 2px solid var(--border); border-radius: var(--radius-sm); font-size: 0.88rem; outline: none; transition: var(--transition); font-family: inherit; background: var(--white); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { resize: vertical; }

/* ---- 评价卡片 ---- */
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.review-card { background: var(--white); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); transition: var(--transition); }
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.review-card.animate-in { animation: fadeInUp 0.5s ease forwards; }
.review-stars { color: var(--accent); font-size: 1rem; margin-bottom: 12px; }
.review-text { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 16px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar { width: 36px; height: 36px; background: var(--primary); color: var(--white); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.9rem; flex-shrink: 0; }
.review-name { font-size: 0.88rem; font-weight: 700; color: var(--text); }
.review-date { font-size: 0.75rem; color: var(--text-muted); }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 12px; overflow: hidden; }
.faq-question { padding: 18px 20px; font-weight: 600; font-size: 0.95rem; color: var(--text); cursor: pointer; display: flex; justify-content: space-between; align-items: center; transition: var(--transition); }
.faq-question:hover { background: var(--bg); }
.faq-item.open .faq-question { background: var(--primary); color: var(--white); }
.faq-icon { font-size: 1.2rem; font-weight: 400; transition: var(--transition); }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer { padding: 0 20px; max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; }
.faq-item.open .faq-answer { padding: 16px 20px; max-height: 300px; }

/* ---- 分享栏 ---- */
.share-bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.share-label { font-size: 0.88rem; color: var(--text-muted); }
.share-btn { padding: 8px 20px; border-radius: 20px; font-size: 0.85rem; font-weight: 600; border: none; cursor: pointer; transition: var(--transition); }
.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); }

/* ---- 直播标签 ---- */
.live-badge { display: inline-flex; align-items: center; gap: 5px; background: #e6162d; color: #fff; font-size: 0.72rem; font-weight: 700; padding: 3px 9px; border-radius: 12px; }
.live-dot { width: 6px; height: 6px; background: #fff; border-radius: 50%; animation: blink 1s infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

/* ---- 标签 ---- */
.tag { display: inline-block; padding: 3px 10px; border-radius: 12px; font-size: 0.75rem; font-weight: 600; }
.tag-primary { background: rgba(26,44,91,0.1); color: var(--primary); }
.tag-gold { background: rgba(212,160,23,0.15); color: #92600a; }
.tag-green { background: rgba(26,107,60,0.1); color: var(--green); }

/* ---- 面包屑 ---- */
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.82rem; color: var(--text-muted); padding: 12px 0; }
.breadcrumb a { color: var(--primary); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { color: var(--text-muted); }

/* ---- 页面英雄区（内页） ---- */
.page-hero { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: var(--white); padding: 56px 0; text-align: center; }
.page-hero h1 { font-size: 2.2rem; color: var(--white); margin-bottom: 16px; }
.page-hero p { font-size: 1rem; color: rgba(255,255,255,0.8); max-width: 600px; margin: 0 auto; }

/* ---- 内页内容 ---- */
.inner-content { padding: 48px 0; }
.content-card { background: var(--white); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); margin-bottom: 32px; }
.content-card h2 { font-size: 1.3rem; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 2px solid var(--bg); }
.content-card h3 { font-size: 1rem; color: var(--primary); margin: 20px 0 8px; }

/* ---- 底部 ---- */
.site-footer { background: var(--bg-dark); color: rgba(255,255,255,0.7); padding: 56px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .site-logo { margin-bottom: 16px; }
.footer-brand .logo-name { color: var(--white); }
.footer-brand .logo-slogan { color: rgba(255,255,255,0.5); }
.footer-desc { font-size: 0.82rem; color: rgba(255,255,255,0.5); line-height: 1.7; margin-bottom: 16px; }
.footer-social { display: flex; gap: 10px; }
.footer-social a { width: 34px; height: 34px; background: rgba(255,255,255,0.1); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 0.8rem; font-weight: 700; color: rgba(255,255,255,0.7); transition: var(--transition); }
.footer-social a:hover { background: var(--accent); color: var(--primary); }
.footer-col h4 { font-size: 0.95rem; color: var(--white); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 0.82rem; color: rgba(255,255,255,0.5); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--accent-light); }
.footer-qr { display: flex; gap: 16px; }
.footer-qr-item { text-align: center; }
.footer-qr-item img { width: 72px; height: 72px; border-radius: 6px; border: 1px solid rgba(255,255,255,0.1); }
.footer-qr-item p { font-size: 0.7rem; color: rgba(255,255,255,0.4); margin-top: 6px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-copyright { font-size: 0.78rem; color: rgba(255,255,255,0.4); }
.footer-copyright a { color: rgba(255,255,255,0.5); }
.footer-copyright a:hover { color: var(--accent-light); }
.footer-links { display: flex; gap: 16px; }
.footer-links a { font-size: 0.78rem; color: rgba(255,255,255,0.4); }
.footer-links a:hover { color: var(--accent-light); }
.footer-update { font-size: 0.78rem; color: rgba(255,255,255,0.35); }

/* ---- 动画 ---- */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-logos { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .hero-title { font-size: 2rem; }
  .hero-slider { height: 380px; }
  .hero-stats { display: none; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .partner-logos { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .main-nav { display: none; position: fixed; top: 64px; left: 0; right: 0; background: var(--white); padding: 20px; box-shadow: 0 8px 24px rgba(0,0,0,0.1); z-index: 999; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; gap: 4px; }
  .main-nav a { display: block; padding: 12px 16px; border-radius: 8px; }
  .hamburger { display: flex; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.5rem; }
  .hero-btns { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 1.6rem; }
  .hero-slider { height: 320px; }
  .page-hero h1 { font-size: 1.6rem; }
}

/* ---- 打印样式 ---- */
@media print {
  .site-header, .search-bar-wrap, .notice-bar, .hero-section, .top-bar, .site-footer { display: none; }
  body { font-size: 12pt; }
}