/* =============================================
   抖阴 - 动物写真视频社区 | izdmijo.cn
   原创主题：竹绿·墨黑·自然金
   ============================================= */

/* === 1. CSS变量 === */
:root {
  --brand-green:   #2d6a2d;
  --brand-dark:    #1a1a1a;
  --brand-gold:    #c8a84b;
  --brand-light:   #f5f9f2;
  --brand-mid:     #4a7c4a;
  --brand-pale:    #e8f3e8;
  --text-main:     #222222;
  --text-sub:      #555555;
  --text-light:    #888888;
  --border-color:  #d4e8d4;
  --shadow-sm:     0 2px 8px rgba(45,106,45,0.10);
  --shadow-md:     0 6px 24px rgba(45,106,45,0.15);
  --shadow-lg:     0 12px 40px rgba(45,106,45,0.20);
  --radius-sm:     6px;
  --radius-md:     12px;
  --radius-lg:     20px;
  --transition:    0.3s ease;
  --font-main:     'PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
}

/* === 2. 重置与基础 === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  background: var(--brand-light);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--brand-green); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--brand-gold); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; outline: none; font-family: var(--font-main); }

/* === 3. 通用工具类 === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 70px 0; }
.section-alt { background: var(--brand-pale); }
.section-dark { background: var(--brand-dark); color: #fff; }
.text-center { text-align: center; }
.text-green { color: var(--brand-green); }
.text-gold { color: var(--brand-gold); }
.badge {
  display: inline-block;
  background: var(--brand-green);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: 600;
  letter-spacing: 0.5px;
}
.badge-gold { background: var(--brand-gold); }
.badge-red { background: #e53935; }
.btn {
  display: inline-block;
  padding: 11px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
}
.btn-primary {
  background: var(--brand-green);
  color: #fff;
  border: 2px solid var(--brand-green);
}
.btn-primary:hover {
  background: var(--brand-mid);
  border-color: var(--brand-mid);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  color: var(--brand-green);
  border: 2px solid var(--brand-green);
}
.btn-outline:hover {
  background: var(--brand-green);
  color: #fff;
  transform: translateY(-2px);
}
.btn-gold {
  background: var(--brand-gold);
  color: #fff;
  border: 2px solid var(--brand-gold);
}
.btn-gold:hover { background: #b8943b; border-color: #b8943b; color: #fff; }

/* === 4. 章节标题 === */
.section-header { text-align: center; margin-bottom: 50px; }
.section-header .label {
  display: inline-block;
  background: var(--brand-pale);
  color: var(--brand-green);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  color: var(--brand-dark);
  line-height: 1.3;
  margin-bottom: 14px;
}
.section-header h2 .highlight { color: var(--brand-green); }
.section-header p {
  font-size: 16px;
  color: var(--text-sub);
  max-width: 600px;
  margin: 0 auto;
}
.section-dark .section-header h2 { color: #fff; }
.section-dark .section-header p { color: rgba(255,255,255,0.7); }

/* === 5. 导航栏 === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(26,26,26,0.97);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--brand-green);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--brand-green);
}
.site-logo .logo-text {
  font-size: 22px;
  font-weight: 900;
  color: #fff;
  letter-spacing: 1px;
}
.site-logo .logo-text span { color: var(--brand-gold); }
.site-nav { display: flex; align-items: center; gap: 4px; }
.site-nav a {
  color: rgba(255,255,255,0.85);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}
.site-nav a:hover, .site-nav a.active {
  color: #fff;
  background: var(--brand-green);
}
/* 搜索框 */
.header-search {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 24px;
  padding: 6px 14px;
  gap: 8px;
  min-width: 180px;
  transition: all var(--transition);
}
.header-search:focus-within {
  background: rgba(255,255,255,0.12);
  border-color: var(--brand-green);
  box-shadow: 0 0 0 3px rgba(45,106,45,0.2);
}
.header-search input {
  background: transparent;
  border: none;
  outline: none;
  color: #fff;
  font-size: 13px;
  width: 120px;
  font-family: var(--font-main);
}
.header-search input::placeholder { color: rgba(255,255,255,0.4); }
.header-search .search-btn {
  background: none;
  color: rgba(255,255,255,0.6);
  font-size: 14px;
  padding: 0;
  transition: color var(--transition);
}
.header-search .search-btn:hover { color: var(--brand-gold); }
/* 汉堡菜单 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 4px;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition);
}

/* === 6. Hero Banner === */
.hero-banner {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner-hero.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(26,26,26,0.82) 0%,
    rgba(45,106,45,0.55) 50%,
    rgba(26,26,26,0.70) 100%
  );
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(45,106,45,0.3);
  border: 1px solid rgba(45,106,45,0.5);
  color: #a8d5a8;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 24px;
  margin-bottom: 24px;
  letter-spacing: 1px;
}
.hero-eyebrow .dot {
  width: 6px; height: 6px;
  background: #6fcf6f;
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}
.hero-content h1 {
  font-size: clamp(36px, 5.5vw, 68px);
  font-weight: 900;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero-content h1 .brand { color: var(--brand-gold); }
.hero-content h1 .green { color: #7ed87e; }
.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
  max-width: 580px;
  line-height: 1.6;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 48px; }
.hero-stats {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  display: block;
  font-size: 28px;
  font-weight: 900;
  color: var(--brand-gold);
  line-height: 1;
}
.hero-stat .label {
  font-size: 12px;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}
.hero-scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,0.5);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
}
.hero-scroll .arrow {
  width: 20px; height: 20px;
  border-right: 2px solid rgba(255,255,255,0.4);
  border-bottom: 2px solid rgba(255,255,255,0.4);
  transform: rotate(45deg);
  animation: bounce 1.5s infinite;
}
@keyframes bounce {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50% { transform: rotate(45deg) translateY(6px); }
}

/* === 7. 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-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.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(1.06); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 56px; height: 56px;
  background: rgba(255,255,255,0.92);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.85);
  transition: transform var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  width: 0; height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 18px solid var(--brand-green);
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}
.video-badge {
  position: absolute;
  top: 8px; left: 8px;
}
.video-info { padding: 14px 16px 16px; }
.video-info h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
  line-height: 1.4;
  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 span { display: flex; align-items: center; gap: 3px; }
.video-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.vtag {
  font-size: 11px;
  background: var(--brand-pale);
  color: var(--brand-green);
  padding: 2px 8px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
}

/* === 8. 专家卡片 === */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}
.expert-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition);
}
.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand-green);
}
.expert-header { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 16px; }
.expert-avatar {
  width: 72px; height: 72px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--brand-green);
  flex-shrink: 0;
}
.expert-meta h3 { font-size: 17px; font-weight: 800; color: var(--text-main); margin-bottom: 4px; }
.expert-title { font-size: 13px; color: var(--brand-green); font-weight: 600; margin-bottom: 4px; }
.expert-cert { font-size: 12px; color: var(--text-light); }
.expert-desc { font-size: 14px; color: var(--text-sub); line-height: 1.6; margin-bottom: 16px; }
.expert-awards { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.award-tag {
  font-size: 11px;
  background: linear-gradient(135deg, #fff8e1, #fff3cd);
  color: #8a6914;
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid #f0d060;
  font-weight: 600;
}
.expert-actions { display: flex; gap: 10px; }
.expert-actions .btn { padding: 8px 18px; font-size: 13px; }

/* === 9. AI赋能模块 === */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.ai-card {
  background: linear-gradient(135deg, #0d2b0d, #1a4a1a);
  border: 1px solid rgba(45,106,45,0.4);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all var(--transition);
}
.ai-card:hover {
  transform: translateY(-4px);
  border-color: var(--brand-green);
  box-shadow: 0 8px 30px rgba(45,106,45,0.3);
}
.ai-icon {
  width: 52px; height: 52px;
  background: rgba(45,106,45,0.3);
  border: 1px solid rgba(45,106,45,0.5);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}
.ai-card h3 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 10px; }
.ai-card p { font-size: 13px; color: rgba(255,255,255,0.65); line-height: 1.6; margin-bottom: 14px; }
.ai-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.ai-tag {
  font-size: 11px;
  background: rgba(45,106,45,0.25);
  color: #a8d5a8;
  padding: 2px 8px;
  border-radius: 20px;
  border: 1px solid rgba(45,106,45,0.3);
}

/* === 10. 社区功能 === */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.community-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition);
}
.community-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand-green);
}
.comm-icon {
  font-size: 36px;
  margin-bottom: 12px;
  display: block;
}
.community-card h3 { font-size: 15px; font-weight: 700; color: var(--text-main); margin-bottom: 6px; }
.community-card p { font-size: 13px; color: var(--text-sub); line-height: 1.5; margin-bottom: 12px; }
.comm-stats { display: flex; justify-content: center; gap: 16px; }
.comm-stat { font-size: 12px; color: var(--text-light); }
.comm-stat strong { display: block; font-size: 16px; color: var(--brand-green); font-weight: 800; }

/* === 11. 合作品牌 === */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}
.partner-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-sub);
  transition: all var(--transition);
}
.partner-card:hover {
  border-color: var(--brand-green);
  color: var(--brand-green);
  box-shadow: var(--shadow-sm);
}

/* === 12. FAQ === */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.faq-item:hover { box-shadow: var(--shadow-sm); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  gap: 12px;
  user-select: none;
}
.faq-question .q-num {
  width: 28px; height: 28px;
  background: var(--brand-green);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}
.faq-question .q-text { flex: 1; }
.faq-arrow {
  width: 20px; height: 20px;
  border-right: 2px solid var(--brand-green);
  border-bottom: 2px solid var(--brand-green);
  transform: rotate(45deg);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-top: -4px;
}
.faq-item.open .faq-arrow { transform: rotate(-135deg); margin-top: 4px; }
.faq-answer {
  display: none;
  padding: 0 22px 18px 62px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}
.faq-item.open .faq-answer { display: block; }

/* === 13. 用户评论 === */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition);
}
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.reviewer-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--brand-green);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}
.reviewer-info .name { font-size: 14px; font-weight: 700; color: var(--text-main); }
.reviewer-info .meta { font-size: 12px; color: var(--text-light); }
.review-stars { color: #f5a623; font-size: 14px; margin-bottom: 10px; }
.review-text { font-size: 14px; color: var(--text-sub); line-height: 1.6; margin-bottom: 12px; }
.review-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.review-tag {
  font-size: 11px;
  background: var(--brand-pale);
  color: var(--brand-green);
  padding: 2px 8px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
}

/* === 14. 联系我们 === */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info h3 { font-size: 20px; font-weight: 800; margin-bottom: 20px; color: var(--text-main); }
.contact-item {
  display: flex;
  gap: 14px;
  margin-bottom: 18px;
  align-items: flex-start;
}
.contact-icon {
  width: 40px; height: 40px;
  background: var(--brand-pale);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-item .label { font-size: 12px; color: var(--text-light); margin-bottom: 2px; }
.contact-item .value { font-size: 14px; color: var(--text-main); font-weight: 600; }
.qrcode-row { display: flex; gap: 24px; margin-top: 24px; }
.qrcode-box { text-align: center; }
.qrcode-box img { width: 100px; height: 100px; border-radius: var(--radius-sm); border: 2px solid var(--border-color); }
.qrcode-box p { font-size: 12px; color: var(--text-light); margin-top: 6px; }
.social-share { margin-top: 24px; }
.social-share h4 { font-size: 14px; font-weight: 700; color: var(--text-main); margin-bottom: 12px; }
.share-btns { display: flex; gap: 10px; flex-wrap: wrap; }
.share-btn {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  transition: all var(--transition);
}
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; }
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #010101; }
.share-bilibili { background: #00a1d6; }

/* === 15. 页脚 === */
.site-footer {
  background: #111;
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo-wrap { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand .logo-wrap img { width: 36px; height: 36px; border-radius: 50%; border: 2px solid var(--brand-green); }
.footer-brand .logo-wrap span { font-size: 20px; font-weight: 900; color: #fff; }
.footer-brand .logo-wrap span em { color: var(--brand-gold); font-style: normal; }
.footer-brand p { font-size: 13px; line-height: 1.7; margin-bottom: 16px; }
.footer-col h4 { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 13px; color: rgba(255,255,255,0.6); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--brand-gold); }
.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: 10px;
  font-size: 12px;
  color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--brand-gold); }

/* === 16. 面包屑 === */
.breadcrumb {
  background: var(--brand-pale);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 0;
}
.breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-light);
}
.breadcrumb-inner a { color: var(--brand-green); }
.breadcrumb-inner .sep { color: var(--border-color); }
.breadcrumb-inner .current { color: var(--text-main); font-weight: 600; }

/* === 17. 内页Hero === */
.page-hero {
  background: linear-gradient(135deg, var(--brand-dark) 0%, #0d2b0d 100%);
  padding: 70px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(45,106,45,0.3) 0%, transparent 70%);
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { font-size: clamp(28px, 4vw, 48px); font-weight: 900; color: #fff; margin-bottom: 12px; }
.page-hero p { font-size: 16px; color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto; }

/* === 18. 信任标志 === */
.trust-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}
.trust-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px 16px;
  text-align: center;
  transition: all var(--transition);
}
.trust-card:hover { border-color: var(--brand-green); box-shadow: var(--shadow-sm); }
.trust-card .icon { font-size: 28px; margin-bottom: 8px; }
.trust-card .title { font-size: 13px; font-weight: 700; color: var(--text-main); margin-bottom: 4px; }
.trust-card .desc { font-size: 11px; color: var(--text-light); }

/* === 19. 视频模态框 === */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.9);
  align-items: center;
  justify-content: center;
}
.video-modal.active { display: flex; }
.modal-inner {
  position: relative;
  width: 90%;
  max-width: 860px;
  background: #111;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.8);
}
.modal-video-wrap { aspect-ratio: 16/9; background: #000; display: flex; align-items: center; justify-content: center; }
.modal-video-wrap .placeholder {
  text-align: center;
  color: rgba(255,255,255,0.5);
  font-size: 15px;
}
.modal-video-wrap .placeholder .play-big {
  width: 80px; height: 80px;
  background: rgba(45,106,45,0.5);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.modal-video-wrap .placeholder .play-big::after {
  content: '';
  width: 0; height: 0;
  border-top: 14px solid transparent;
  border-bottom: 14px solid transparent;
  border-left: 24px solid rgba(255,255,255,0.8);
  margin-left: 6px;
}
.modal-info { padding: 20px 24px; }
.modal-info h3 { font-size: 17px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.modal-info p { font-size: 13px; color: rgba(255,255,255,0.6); }
.modal-close {
  position: absolute;
  top: 12px; right: 12px;
  width: 32px; height: 32px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  transition: background var(--transition);
  z-index: 10;
}
.modal-close:hover { background: rgba(255,255,255,0.2); }

/* === 20. 搜索结果提示 === */
.search-hint {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-sub);
  white-space: nowrap;
  box-shadow: var(--shadow-md);
  z-index: 100;
  margin-top: 4px;
}
.header-search-wrap { position: relative; }
.header-search-wrap:focus-within .search-hint { display: block; }

/* === 21. 干扰标签隐藏 === */
.noise-wrap {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
}

/* === 22. 响应式 === */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .site-nav { display: none; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0; background: rgba(26,26,26,0.98); padding: 16px; gap: 4px; }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 16px; border-radius: var(--radius-sm); }
  .menu-toggle { display: flex; }
  .header-search { min-width: 140px; }
  .header-search input { width: 80px; }
  .hero-content h1 { font-size: 32px; }
  .hero-stats { gap: 20px; }
  .video-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 50px 0; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { text-align: center; }
}