/* =============================================
   抖阴 - 动物写真视频社区 全局样式
   hbbqyqy.cn | 原创设计 © 2025
   ============================================= */

/* ---- CSS变量 ---- */
:root {
  --primary: #1a5c3a;
  --primary-dark: #0f3d26;
  --primary-light: #2d8a58;
  --accent: #f0a500;
  --accent-dark: #c88600;
  --accent-light: #ffc840;
  --bg-dark: #0d1f15;
  --bg-mid: #152b1e;
  --bg-light: #f7f9f5;
  --text-main: #1a2e20;
  --text-sub: #4a6355;
  --text-light: #8aaa96;
  --white: #ffffff;
  --card-bg: #ffffff;
  --border: #d4e8db;
  --shadow: 0 4px 24px rgba(26,92,58,0.10);
  --shadow-hover: 0 8px 40px rgba(26,92,58,0.18);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.28s cubic-bezier(.4,0,.2,1);
  --font-main: 'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  color: var(--text-main);
  background: var(--bg-light);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ---- 干扰标签隐藏 ---- */
.dy-noise { display: none !important; visibility: hidden !important; position: absolute !important; left: -9999px !important; top: -9999px !important; width: 0 !important; height: 0 !important; overflow: hidden !important; pointer-events: none !important; }

/* ---- 顶部公告栏 ---- */
.top-bar {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.85);
  font-size: 0.82rem;
  padding: 7px 0;
  text-align: center;
  letter-spacing: 0.03em;
}
.top-bar a { color: var(--accent-light); }
.top-bar .tb-inner { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ---- 导航 ---- */
.site-header {
  background: var(--white);
  box-shadow: 0 2px 16px rgba(26,92,58,0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.nav-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  height: 68px;
  gap: 24px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img.logo-img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  object-fit: cover;
}
.site-logo .logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.01em;
}
.site-logo .logo-sub {
  font-size: 0.7rem;
  color: var(--text-light);
  display: block;
  font-weight: 400;
  margin-top: -3px;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.main-nav a {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-main);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  background: var(--primary);
  color: var(--white);
}
.nav-search {
  display: flex;
  align-items: center;
  background: var(--bg-light);
  border: 1.5px solid var(--border);
  border-radius: 24px;
  padding: 5px 14px;
  gap: 8px;
  min-width: 200px;
}
.nav-search input {
  border: none;
  background: transparent;
  font-size: 0.88rem;
  color: var(--text-main);
  outline: none;
  width: 140px;
  font-family: var(--font-main);
}
.nav-search input::placeholder { color: var(--text-light); }
.nav-search button {
  color: var(--primary);
  font-size: 1rem;
  padding: 0;
  line-height: 1;
}
.nav-cta {
  background: var(--accent);
  color: var(--white) !important;
  padding: 7px 18px !important;
  border-radius: 24px !important;
  font-weight: 700 !important;
  font-size: 0.88rem !important;
  transition: background var(--transition) !important;
}
.nav-cta:hover { background: var(--accent-dark) !important; }
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 8px; cursor: pointer; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--primary); border-radius: 2px; transition: 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: 700px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  gap: 0;
}
.search-bar-inner input {
  flex: 1;
  padding: 11px 20px;
  border: none;
  border-radius: 28px 0 0 28px;
  font-size: 0.95rem;
  font-family: var(--font-main);
  outline: none;
  color: var(--text-main);
}
.search-bar-inner button {
  background: var(--accent);
  color: var(--white);
  padding: 11px 28px;
  border-radius: 0 28px 28px 0;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: var(--font-main);
  transition: background var(--transition);
}
.search-bar-inner button:hover { background: var(--accent-dark); }

/* ---- 面包屑 ---- */
.breadcrumb {
  background: var(--white);
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.breadcrumb-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  font-size: 0.82rem;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb-inner a { color: var(--primary); }
.breadcrumb-inner span { color: var(--text-light); }

/* ---- Banner ---- */
.hero-banner {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--bg-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(120deg, rgba(13,31,21,0.85) 0%, rgba(26,92,58,0.45) 60%, rgba(240,165,0,0.12) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 20px 60px;
  color: var(--white);
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(240,165,0,0.18);
  border: 1px solid rgba(240,165,0,0.5);
  color: var(--accent-light);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: 0.05em;
}
.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.18;
  margin-bottom: 18px;
  text-shadow: 0 2px 16px rgba(0,0,0,0.4);
}
.hero-content h1 em {
  font-style: normal;
  color: var(--accent-light);
}
.hero-content p {
  font-size: 1.08rem;
  opacity: 0.88;
  max-width: 560px;
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  background: var(--accent);
  color: var(--white);
  padding: 13px 32px;
  border-radius: 28px;
  font-size: 1rem;
  font-weight: 700;
  transition: background var(--transition), transform var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); }
.btn-outline {
  background: transparent;
  color: var(--white);
  padding: 12px 28px;
  border-radius: 28px;
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid rgba(255,255,255,0.6);
  transition: border-color var(--transition), background var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-outline:hover { border-color: var(--white); background: rgba(255,255,255,0.1); }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 1.8rem; font-weight: 900; color: var(--accent-light); }
.hero-stat .label { font-size: 0.78rem; opacity: 0.75; margin-top: 2px; }

/* ---- 通用容器 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.section-sm { padding: 48px 0; }
.section-dark { background: var(--bg-dark); color: var(--white); }
.section-mid { background: var(--bg-mid); color: var(--white); }
.section-alt { background: #f0f7f3; }

/* ---- 区块标题 ---- */
.section-head { text-align: center; margin-bottom: 48px; }
.section-head .tag {
  display: inline-block;
  background: rgba(26,92,58,0.1);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 16px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}
.section-dark .section-head .tag { background: rgba(240,165,0,0.15); color: var(--accent-light); }
.section-head h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 12px;
}
.section-dark .section-head h2 { color: var(--white); }
.section-head p {
  font-size: 1rem;
  color: var(--text-sub);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.75;
}
.section-dark .section-head p { color: rgba(255,255,255,0.7); }

/* ---- 视频卡片 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow 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(--bg-dark);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}
.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);
  transition: background var(--transition);
}
.video-card:hover .play-btn { background: rgba(0,0,0,0.35); }
.play-icon {
  width: 52px;
  height: 52px;
  background: rgba(240,165,0,0.92);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity var(--transition), transform var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.video-card:hover .play-icon { opacity: 1; transform: scale(1); }
.play-icon svg { width: 22px; height: 22px; fill: white; margin-left: 3px; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 10px;
  background: rgba(0,0,0,0.72);
  color: var(--white);
  font-size: 0.75rem;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--accent);
  color: var(--white);
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 700;
}
.video-info { padding: 14px 16px 16px; }
.video-info h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-light);
}
.video-meta span { display: flex; align-items: center; gap: 3px; }
.video-meta svg { width: 13px; height: 13px; fill: currentColor; }

/* ---- 通用卡片 ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.card-img { aspect-ratio: 4/3; overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition); }
.card:hover .card-img img { transform: scale(1.05); }
.card-body { padding: 18px 20px 20px; }
.card-body h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--text-main); }
.card-body p { font-size: 0.88rem; color: var(--text-sub); line-height: 1.65; }
.card-tag {
  display: inline-block;
  background: rgba(26,92,58,0.1);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 8px;
}

/* ---- 专家卡片 ---- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 28px;
}
.expert-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 28px 24px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.expert-card:hover { transform: translateY(-6px); 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(--accent);
}
.expert-card h3 { font-size: 1.05rem; font-weight: 800; color: var(--text-main); margin-bottom: 4px; }
.expert-card .role { font-size: 0.82rem; color: var(--primary); font-weight: 600; margin-bottom: 10px; }
.expert-card p { font-size: 0.83rem; color: var(--text-sub); line-height: 1.6; margin-bottom: 14px; }
.expert-btns { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.btn-sm {
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 0.8rem;
  font-weight: 600;
  transition: var(--transition);
}
.btn-sm.outline { border: 1.5px solid var(--primary); color: var(--primary); }
.btn-sm.outline:hover { background: var(--primary); color: var(--white); }
.btn-sm.solid { background: var(--accent); color: var(--white); }
.btn-sm.solid:hover { background: var(--accent-dark); }

/* ---- 评价区 ---- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 22px 22px 20px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--accent);
}
.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-light), var(--accent)); display: flex; align-items: center; justify-content: center; color: white; font-weight: 800; font-size: 1rem; flex-shrink: 0; }
.review-name { font-weight: 700; font-size: 0.92rem; }
.review-stars { color: var(--accent); font-size: 0.85rem; }
.review-text { font-size: 0.88rem; color: var(--text-sub); line-height: 1.7; }
.review-date { font-size: 0.75rem; color: var(--text-light); margin-top: 10px; }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--white);
  border-radius: var(--radius);
  margin-bottom: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.faq-q {
  padding: 18px 22px;
  font-weight: 700;
  font-size: 0.97rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-main);
  transition: color var(--transition);
}
.faq-q:hover { color: var(--primary); }
.faq-q .icon { font-size: 1.2rem; color: var(--primary); transition: transform var(--transition); }
.faq-item.open .faq-q .icon { transform: rotate(45deg); }
.faq-a {
  padding: 0 22px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.75;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 22px 18px; }

/* ---- 合作品牌Logo墙 ---- */
.partner-wall {
  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);
  padding: 14px 28px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-sub);
  transition: border-color var(--transition), color var(--transition);
}
.partner-item:hover { border-color: var(--primary); color: var(--primary); }

/* ---- 联系区 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.contact-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
}
.contact-card .icon { font-size: 2.2rem; margin-bottom: 12px; }
.contact-card h4 { font-size: 1rem; font-weight: 700; color: var(--white); margin-bottom: 8px; }
.contact-card p { font-size: 0.88rem; color: rgba(255,255,255,0.65); line-height: 1.65; }
.contact-card a { color: var(--accent-light); }

/* ---- 社交分享 ---- */
.share-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: opacity var(--transition), transform var(--transition);
  color: var(--white);
}
.share-btn:hover { opacity: 0.85; transform: translateY(-2px); }
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #010101; }
.share-bilibili { background: #00a1d6; }

/* ---- 页脚 ---- */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.75);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 48px;
}
.footer-brand .logo-wrap { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand .logo-wrap img { width: 40px; height: 40px; border-radius: 8px; }
.footer-brand .logo-wrap span { font-size: 1.2rem; font-weight: 800; color: var(--white); }
.footer-brand p { font-size: 0.85rem; line-height: 1.75; color: rgba(255,255,255,0.6); margin-bottom: 20px; }
.footer-qr-row { display: flex; gap: 16px; }
.footer-qr { text-align: center; }
.footer-qr img { width: 80px; height: 80px; border-radius: 8px; border: 2px solid rgba(255,255,255,0.15); }
.footer-qr p { font-size: 0.72rem; color: rgba(255,255,255,0.5); margin-top: 6px; }
.footer-col h5 { font-size: 0.9rem; font-weight: 700; color: var(--white); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 9px; }
.footer-col ul li a { font-size: 0.84rem; color: rgba(255,255,255,0.55); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--accent-light); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 18px 20px;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--accent-light); }

/* ---- 特色区块 ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.feature-item {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 28px 22px;
  text-align: center;
  transition: background var(--transition), border-color var(--transition);
}
.feature-item:hover { background: rgba(255,255,255,0.09); border-color: rgba(240,165,0,0.4); }
.feature-icon { font-size: 2.4rem; margin-bottom: 14px; }
.feature-item h3 { font-size: 1rem; font-weight: 700; color: var(--white); margin-bottom: 8px; }
.feature-item p { font-size: 0.84rem; color: rgba(255,255,255,0.6); line-height: 1.65; }

/* ---- AI赋能区 ---- */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-card {
  background: linear-gradient(135deg, rgba(26,92,58,0.15) 0%, rgba(240,165,0,0.08) 100%);
  border: 1px solid rgba(26,92,58,0.2);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.ai-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(26,92,58,0.15); }
.ai-card .ai-icon { font-size: 2.2rem; margin-bottom: 14px; }
.ai-card h3 { font-size: 1.05rem; font-weight: 800; color: var(--text-main); margin-bottom: 10px; }
.ai-card p { font-size: 0.88rem; color: var(--text-sub); line-height: 1.7; }

/* ---- 数据统计条 ---- */
.stats-bar {
  background: var(--primary);
  padding: 32px 0;
}
.stats-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-item .num { font-size: 2.2rem; font-weight: 900; color: var(--accent-light); }
.stat-item .label { font-size: 0.85rem; color: rgba(255,255,255,0.75); margin-top: 4px; }

/* ---- 内页Hero ---- */
.page-hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  padding: 60px 0 50px;
  color: var(--white);
  text-align: center;
}
.page-hero h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 900; margin-bottom: 12px; }
.page-hero p { font-size: 1rem; opacity: 0.8; max-width: 560px; margin: 0 auto; }

/* ---- 加入社区指南 ---- */
.guide-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.guide-step {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  position: relative;
}
.guide-step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 30px;
  background: var(--accent);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
}
.guide-step .step-icon { font-size: 2rem; margin: 8px 0 12px; }
.guide-step h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; color: var(--text-main); }
.guide-step p { font-size: 0.83rem; color: var(--text-sub); line-height: 1.6; }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-grid { grid-template-columns: 1fr 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .hamburger { display: flex; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--white);
    padding: 16px 20px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    z-index: 999;
    gap: 4px;
  }
  .nav-search { display: none; }
  .hero-banner { min-height: 420px; }
  .hero-content { padding: 60px 20px 40px; }
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}
@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.7rem; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
}

/* ---- 懒加载占位 ---- */
img[data-src] { background: linear-gradient(90deg, #e8f0eb 25%, #d4e8db 50%, #e8f0eb 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-up { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ---- 视频播放模态框 ---- */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.modal-inner {
  background: var(--bg-dark);
  border-radius: var(--radius-lg);
  overflow: hidden;
  max-width: 800px;
  width: 90%;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  color: var(--white);
  font-size: 1.6rem;
  cursor: pointer;
  z-index: 2;
  line-height: 1;
}
.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: 1rem;
}

/* ---- 标签云 ---- */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.tag-item {
  background: rgba(26,92,58,0.1);
  color: var(--primary);
  padding: 5px 14px;
  border-radius: 16px;
  font-size: 0.83rem;
  font-weight: 600;
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
}
.tag-item:hover { background: var(--primary); color: var(--white); }

/* ---- 分页 ---- */
.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 40px; }
.page-btn {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-sub);
  background: var(--white);
  border: 1.5px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.page-btn:hover, .page-btn.active { background: var(--primary); color: var(--white); border-color: var(--primary); }