/* ============================================
   海角网视频 - 主样式文件（原创配色）
   Brand: 海角网 | Domain: llyzzxc.cn
   ============================================ */

/* ---- 原创配色变量 ---- */
:root {
  --primary: #1a3a5c;        /* 深海蓝 */
  --primary-light: #2a5a8c;  /* 浅海蓝 */
  --accent: #e05520;         /* 珊瑚橙 */
  --accent-light: #ff6b35;   /* 亮珊瑚橙 */
  --gold: #c8a84b;           /* 金沙色 */
  --bg-dark: #0d1f35;        /* 深夜蓝 */
  --bg-light: #f4f7fb;       /* 浅灰蓝 */
  --text-primary: #1a2740;
  --text-secondary: #5a6a80;
  --text-light: #8a9ab0;
  --white: #ffffff;
  --border: #dde4ee;
  --shadow: 0 4px 24px rgba(26,58,92,0.10);
  --shadow-lg: 0 8px 40px rgba(26,58,92,0.16);
  --radius: 10px;
  --radius-lg: 18px;
  --header-h: 64px;
  --search-h: 48px;
}

/* ---- 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', 'Hiragino Sans GB', Arial, sans-serif;
  color: var(--text-primary);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

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

/* ============================================
   头部
   ============================================ */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: var(--primary);
  box-shadow: 0 2px 12px rgba(0,0,0,0.18);
  height: var(--header-h);
}
.header-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  height: 100%; display: flex; align-items: center; gap: 24px;
}

/* Logo */
.site-logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; flex-shrink: 0;
}
.site-logo img {
  width: 44px; height: 44px; border-radius: 8px;
  object-fit: cover; border: 2px solid rgba(255,255,255,0.2);
}
.logo-text {
  display: block; font-size: 22px; font-weight: 800;
  color: var(--white); letter-spacing: 2px;
  line-height: 1.1;
}
.logo-sub {
  display: block; font-size: 9px; color: rgba(255,255,255,0.55);
  letter-spacing: 1.5px; font-weight: 400; line-height: 1;
}

/* 主导航 */
.main-nav {
  display: flex; align-items: center; gap: 4px;
  margin-left: auto;
}
.main-nav a {
  color: rgba(255,255,255,0.82); font-size: 14px; font-weight: 500;
  padding: 6px 14px; border-radius: 6px;
  transition: background .2s, color .2s;
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  background: rgba(255,255,255,0.12); color: var(--white);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  padding: 8px; margin-left: auto;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--white); border-radius: 2px;
  transition: transform .3s, opacity .3s;
}

/* 搜索栏 */
.search-bar {
  background: var(--bg-light); border-bottom: 1px solid var(--border);
  height: var(--search-h);
}
.search-bar-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  height: 100%; display: flex; align-items: center;
}
.search-form {
  display: flex; align-items: center; gap: 0;
  width: 100%; max-width: 600px;
}
.search-form input {
  flex: 1; height: 34px; padding: 0 14px;
  border: 1.5px solid var(--border); border-right: none;
  border-radius: 6px 0 0 6px; font-size: 13px;
  background: var(--white); color: var(--text-primary);
  outline: none; transition: border-color .2s;
}
.search-form input:focus { border-color: var(--primary-light); }
.search-form button {
  height: 34px; padding: 0 18px;
  background: var(--accent); color: var(--white);
  border-radius: 0 6px 6px 0; font-size: 13px; font-weight: 600;
  transition: background .2s;
}
.search-form button:hover { background: var(--accent-light); }

/* 面包屑 */
.breadcrumb {
  background: var(--bg-light); border-bottom: 1px solid var(--border);
  padding: 8px 0;
}
.breadcrumb-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  font-size: 13px; color: var(--text-secondary);
  display: flex; align-items: center; gap: 6px;
}
.breadcrumb a { color: var(--primary-light); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { color: var(--text-light); }

/* ============================================
   Hero 区域
   ============================================ */
.hero {
  position: relative; min-height: 520px;
  display: flex; align-items: center;
  overflow: hidden; background: var(--bg-dark);
}
.hero-bg {
  position: absolute; inset: 0;
  background: url('/images/hero-banner.jpg') center/cover no-repeat;
  opacity: 0.35;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(13,31,53,0.92) 0%, rgba(26,58,92,0.75) 60%, rgba(224,85,32,0.18) 100%);
}
.hero-inner {
  position: relative; z-index: 1;
  max-width: 1200px; margin: 0 auto; padding: 60px 20px;
  display: grid; grid-template-columns: 1fr 380px; gap: 40px; align-items: center;
}
.hero-content h1 {
  font-size: clamp(32px, 5vw, 52px); font-weight: 900;
  color: var(--white); line-height: 1.2; margin-bottom: 20px;
  letter-spacing: 1px;
}
.hero-content h1 em {
  font-style: normal; color: var(--accent-light);
}
.hero-content p {
  font-size: 16px; color: rgba(255,255,255,0.78);
  line-height: 1.8; margin-bottom: 28px; max-width: 520px;
}
.hero-stats {
  display: flex; gap: 28px; margin-bottom: 32px;
}
.hero-stat .num {
  display: block; font-size: 28px; font-weight: 800;
  color: var(--accent-light); line-height: 1;
}
.hero-stat .label {
  font-size: 12px; color: rgba(255,255,255,0.55); margin-top: 4px;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }

/* Hero媒体卡片 */
.hero-media { display: flex; justify-content: center; }
.hero-video-card {
  background: rgba(255,255,255,0.08); border-radius: var(--radius-lg);
  overflow: hidden; border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(8px);
}
.hero-video-card img {
  width: 100%; height: 200px; object-fit: cover;
}
.hero-video-info {
  padding: 12px 16px; display: flex; justify-content: space-between;
  font-size: 13px; color: rgba(255,255,255,0.7);
}

/* ============================================
   统计数字栏
   ============================================ */
.stats-bar {
  background: var(--primary); padding: 20px 0;
}
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  text-align: center;
}
.stat-item .num {
  display: block; font-size: 28px; font-weight: 800;
  color: var(--accent-light);
}
.stat-item .label {
  font-size: 12px; color: rgba(255,255,255,0.6); margin-top: 4px;
}

/* ============================================
   通用Section
   ============================================ */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-light); }
.section-header { text-align: center; margin-bottom: 44px; }
.section-tag {
  display: inline-block; background: rgba(224,85,32,0.1);
  color: var(--accent); font-size: 12px; font-weight: 700;
  padding: 4px 12px; border-radius: 20px; letter-spacing: 1px;
  margin-bottom: 12px; border: 1px solid rgba(224,85,32,0.2);
}
.section-title {
  font-size: clamp(22px, 3.5vw, 32px); font-weight: 800;
  color: var(--text-primary); margin-bottom: 12px;
  line-height: 1.3;
}
.section-desc {
  font-size: 15px; color: var(--text-secondary);
  max-width: 600px; margin: 0 auto; line-height: 1.8;
}

/* ============================================
   视频卡片
   ============================================ */
.video-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.video-card {
  background: var(--white); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
  transition: transform .25s, box-shadow .25s;
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow-lg);
}
.video-thumb {
  position: relative; overflow: hidden;
  aspect-ratio: 16/9; background: var(--bg-dark);
}
.video-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .4s;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }

/* 播放按钮 */
.video-play-btn {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0); transition: background .25s;
}
.video-card:hover .video-play-btn { background: rgba(0,0,0,0.35); }
.play-icon {
  width: 52px; height: 52px; border-radius: 50%;
  background: rgba(255,255,255,0.92);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: scale(0.8);
  transition: opacity .25s, transform .25s;
}
.play-icon::after {
  content: ''; display: block;
  width: 0; height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent var(--accent);
  margin-left: 4px;
}
.video-card:hover .play-icon { opacity: 1; transform: scale(1); }

.video-duration {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.72); color: var(--white);
  font-size: 11px; padding: 2px 7px; border-radius: 4px;
}
.video-badge {
  position: absolute; top: 8px; left: 8px;
  background: var(--accent); color: var(--white);
  font-size: 11px; font-weight: 700; padding: 3px 8px; border-radius: 4px;
}
.video-info { padding: 14px 16px; }
.video-title {
  font-size: 14px; font-weight: 700; color: var(--text-primary);
  line-height: 1.5; margin-bottom: 8px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex; gap: 6px; font-size: 12px;
  color: var(--text-light); margin-bottom: 8px;
}
.video-stats {
  display: flex; gap: 12px; font-size: 12px; color: var(--text-secondary);
}

/* ============================================
   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; text-align: center;
  box-shadow: var(--shadow); transition: transform .25s, box-shadow .25s;
  border: 1px solid var(--border);
}
.feature-card:hover {
  transform: translateY(-3px); box-shadow: var(--shadow-lg);
}
.feature-icon {
  font-size: 36px; margin-bottom: 14px; display: block;
}
.feature-card h3 {
  font-size: 15px; font-weight: 700; color: var(--text-primary);
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 13px; color: var(--text-secondary); line-height: 1.7;
}

/* ============================================
   AI赋能区块
   ============================================ */
.ai-section {
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--primary) 100%);
  padding: 64px 0;
}
.ai-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
}
.ai-content h2 {
  font-size: clamp(24px, 3vw, 36px); font-weight: 800;
  color: var(--white); line-height: 1.3; margin: 12px 0 16px;
}
.ai-content p {
  font-size: 15px; color: rgba(255,255,255,0.72); line-height: 1.8; margin-bottom: 24px;
}
.ai-features { display: flex; flex-direction: column; gap: 12px; }
.ai-feature {
  display: flex; align-items: center; gap: 12px;
  font-size: 14px; color: rgba(255,255,255,0.82);
}
.ai-feature-icon {
  font-size: 20px; flex-shrink: 0;
}
.ai-cards {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.ai-card {
  background: rgba(255,255,255,0.08); border-radius: var(--radius);
  padding: 20px; border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(4px);
  transition: background .25s;
}
.ai-card:hover { background: rgba(255,255,255,0.14); }
.ai-card-icon { font-size: 28px; margin-bottom: 10px; display: block; }
.ai-card h4 { font-size: 14px; font-weight: 700; color: var(--white); margin-bottom: 6px; }
.ai-card p { font-size: 12px; color: rgba(255,255,255,0.6); line-height: 1.6; }

/* ============================================
   直播卡片
   ============================================ */
.live-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.live-card {
  background: var(--white); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
  transition: transform .25s;
}
.live-card:hover { transform: translateY(-3px); }
.live-thumb {
  position: relative; aspect-ratio: 16/9; overflow: hidden;
  background: var(--bg-dark);
}
.live-thumb img {
  width: 100%; height: 100%; object-fit: cover;
}
.live-badge {
  position: absolute; top: 8px; left: 8px;
  background: #e02020; color: var(--white);
  font-size: 11px; font-weight: 700; padding: 3px 8px; border-radius: 4px;
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}
.live-viewers {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.65); color: var(--white);
  font-size: 11px; padding: 2px 7px; border-radius: 4px;
}
.live-info { padding: 12px 14px; }
.live-title {
  font-size: 13px; font-weight: 700; color: var(--text-primary);
  line-height: 1.5; margin-bottom: 6px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.live-host { font-size: 12px; color: var(--text-light); }

/* ============================================
   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-lg);
  padding: 28px; box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform .25s, box-shadow .25s;
}
.expert-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow-lg);
}
.expert-header {
  display: flex; align-items: center; gap: 16px; margin-bottom: 16px;
}
.expert-avatar {
  width: 72px; height: 72px; border-radius: 50%; object-fit: cover;
  border: 3px solid var(--primary-light); flex-shrink: 0;
}
.expert-info h3 {
  font-size: 18px; font-weight: 800; color: var(--text-primary);
  margin-bottom: 4px;
}
.expert-title {
  font-size: 12px; color: var(--text-secondary); margin-bottom: 8px;
}
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  background: rgba(26,58,92,0.08); color: var(--primary-light);
  font-size: 11px; padding: 2px 8px; border-radius: 20px;
  border: 1px solid rgba(26,58,92,0.15);
}
.expert-bio {
  font-size: 13px; color: var(--text-secondary); line-height: 1.8;
  margin-bottom: 16px;
}
.expert-actions { display: flex; gap: 10px; }

/* ============================================
   合作品牌
   ============================================ */
.partner-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
}
.partner-item {
  background: var(--white); border-radius: var(--radius);
  padding: 20px; text-align: center;
  font-size: 14px; font-weight: 700; color: var(--text-primary);
  box-shadow: var(--shadow); border: 1px solid var(--border);
  transition: transform .2s, box-shadow .2s;
}
.partner-item:hover {
  transform: translateY(-2px); box-shadow: var(--shadow-lg);
  color: var(--accent);
}

/* ============================================
   How-To步骤
   ============================================ */
.howto-steps {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.step-card {
  background: var(--white); border-radius: var(--radius);
  padding: 28px 20px; text-align: center;
  box-shadow: var(--shadow); border: 1px solid var(--border);
  transition: transform .25s;
}
.step-card:hover { transform: translateY(-3px); }
.step-num {
  width: 48px; height: 48px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white); font-size: 22px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
}
.step-card h3 {
  font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 10px;
}
.step-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }

/* ============================================
   联系我们
   ============================================ */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
}
.contact-info h3 {
  font-size: 18px; font-weight: 700; color: var(--text-primary);
  margin-bottom: 20px; padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}
.contact-item {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 12px 0; border-bottom: 1px solid var(--border);
}
.contact-icon { font-size: 20px; flex-shrink: 0; margin-top: 2px; }
.contact-label { font-size: 12px; color: var(--text-light); margin-bottom: 4px; }
.contact-value { font-size: 14px; color: var(--text-primary); font-weight: 600; }

/* ============================================
   用户评价
   ============================================ */
.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);
  border: 1px solid var(--border);
  transition: transform .25s;
}
.review-card:hover { transform: translateY(-3px); }
.review-header {
  display: flex; align-items: center; gap: 12px; margin-bottom: 12px;
}
.reviewer-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white); font-size: 18px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.reviewer-name { font-size: 14px; font-weight: 700; color: var(--text-primary); }
.reviewer-type { font-size: 12px; color: var(--text-light); margin-top: 2px; }
.review-stars { color: #f5a623; font-size: 14px; margin-bottom: 10px; }
.review-text {
  font-size: 13px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 12px;
}
.review-date { font-size: 12px; color: var(--text-light); }

/* ============================================
   FAQ
   ============================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 12px; overflow: hidden;
  background: var(--white);
}
.faq-question {
  width: 100%; padding: 18px 20px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 15px; font-weight: 700; color: var(--text-primary);
  text-align: left; transition: background .2s;
}
.faq-question:hover { background: var(--bg-light); }
.faq-question.active { color: var(--accent); background: rgba(224,85,32,0.04); }
.faq-icon {
  font-size: 20px; font-weight: 300; color: var(--text-light);
  transition: transform .3s; flex-shrink: 0;
}
.faq-question.active .faq-icon { transform: rotate(45deg); color: var(--accent); }
.faq-answer {
  max-height: 0; overflow: hidden;
  transition: max-height .4s ease, padding .3s;
  font-size: 14px; color: var(--text-secondary); line-height: 1.8;
  padding: 0 20px;
}
.faq-answer.open { max-height: 300px; padding: 0 20px 18px; }

/* ============================================
   分享栏
   ============================================ */
.share-bar {
  background: var(--bg-light); border-top: 1px solid var(--border);
  padding: 10px 0;
}
.share-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; gap: 14px;
}
.share-label { font-size: 13px; color: var(--text-secondary); flex-shrink: 0; }
.share-btns { display: flex; gap: 8px; flex-wrap: wrap; }
.share-btn {
  font-size: 12px; padding: 5px 12px; border-radius: 20px;
  border: 1px solid var(--border); color: var(--text-secondary);
  background: var(--white); transition: all .2s;
}
.share-btn:hover { background: var(--primary); color: var(--white); border-color: var(--primary); }

/* ============================================
   底部
   ============================================ */
.site-footer {
  background: var(--bg-dark); padding: 56px 0 0;
  color: rgba(255,255,255,0.75);
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px;
  padding-bottom: 40px;
}
.footer-brand p {
  font-size: 13px; color: rgba(255,255,255,0.55); line-height: 1.8;
  margin: 14px 0 20px;
}
.footer-title {
  font-size: 14px; font-weight: 700; color: var(--white);
  margin-bottom: 16px; padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-links {
  display: flex; flex-direction: column; gap: 10px;
}
.footer-links a {
  font-size: 13px; color: rgba(255,255,255,0.55);
  transition: color .2s;
}
.footer-links a:hover { color: var(--accent-light); }

/* 二维码 */
.qr-group { display: flex; gap: 16px; flex-wrap: wrap; }
.qr-item { text-align: center; }
.qr-item img {
  width: 80px; height: 80px; border-radius: 8px;
  border: 2px solid rgba(255,255,255,0.15);
}
.qr-item p { font-size: 11px; color: rgba(255,255,255,0.45); margin-top: 6px; line-height: 1.4; }

/* 底部版权栏 */
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 16px 20px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12px; color: rgba(255,255,255,0.35);
  flex-wrap: wrap; gap: 8px;
}
.footer-bottom a { color: rgba(255,255,255,0.45); }
.footer-bottom a:hover { color: var(--accent-light); }
.update-time { font-size: 12px; color: rgba(255,255,255,0.35); }

/* ============================================
   按钮
   ============================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 24px; border-radius: 6px;
  font-size: 14px; font-weight: 700; cursor: pointer;
  transition: all .2s; text-decoration: none; border: 2px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent); color: var(--white); border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-light); border-color: var(--accent-light); color: var(--white);
}
.btn-outline {
  background: transparent; color: var(--white); border-color: rgba(255,255,255,0.5);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1); border-color: var(--white); color: var(--white);
}
.btn-accent {
  background: var(--accent); color: var(--white); border-color: var(--accent);
}
.btn-accent:hover {
  background: var(--accent-light); border-color: var(--accent-light); color: var(--white);
}
.btn-ghost {
  background: transparent; color: var(--primary-light); border-color: var(--border);
}
.btn-ghost:hover {
  background: var(--bg-light); color: var(--primary); border-color: var(--primary-light);
}
.btn-sm { padding: 6px 16px; font-size: 12px; }

/* ============================================
   页面内页Hero
   ============================================ */
.page-hero {
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--primary) 100%);
  padding: 56px 20px; text-align: center;
}
.page-hero h1 {
  font-size: clamp(26px, 4vw, 40px); font-weight: 900;
  color: var(--white); margin-bottom: 14px;
}
.page-hero p {
  font-size: 15px; color: rgba(255,255,255,0.72);
  max-width: 600px; margin: 0 auto; line-height: 1.8;
}

/* ============================================
   Toast提示
   ============================================ */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: rgba(26,31,53,0.92); color: var(--white);
  padding: 12px 24px; border-radius: 8px; font-size: 14px;
  opacity: 0; transition: opacity .3s, transform .3s;
  z-index: 9999; pointer-events: none; white-space: nowrap;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============================================
   移动端适配
   ============================================ */
@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .live-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
  .howto-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --header-h: 56px; }
  .main-nav {
    display: none; flex-direction: column; gap: 0;
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: var(--primary); padding: 16px 0;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    z-index: 999;
  }
  .main-nav.open { display: flex; }
  .main-nav a {
    padding: 12px 24px; border-radius: 0; font-size: 15px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .nav-toggle { display: flex; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-media { display: none; }
  .hero-stats { gap: 16px; }
  .hero-stat .num { font-size: 22px; }
  .video-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .howto-steps { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .live-grid { grid-template-columns: 1fr; }
  .partner-grid { grid-template-columns: repeat(2, 1fr); }
  .howto-steps { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-btns { flex-direction: column; }
  .hero-stats { flex-wrap: wrap; gap: 12px; }
  .section { padding: 40px 0; }
  .search-form { max-width: 100%; }
}

/* ============================================
   打印样式
   ============================================ */
@media print {
  .site-header, .search-bar, .share-bar, .nav-toggle { display: none; }
  .hero { min-height: auto; }
  body { color: #000; }
}