/* ========================================
   探花 - 主样式文件
   avvho29.cn
   ======================================== */

/* ===== CSS变量 ===== */
:root {
  --primary: #E8507A;
  --primary-light: #FF7DA0;
  --primary-dark: #C03060;
  --secondary: #9C27B0;
  --accent: #FF7043;
  --bg-base: #0D0509;
  --bg-card: #1A0A12;
  --bg-card2: #120710;
  --text-white: #F5E6EC;
  --text-muted: #9A7A88;
  --border: rgba(232,80,122,0.18);
  --gradient-main: linear-gradient(135deg, #E8507A 0%, #9C27B0 100%);
  --gradient-warm: linear-gradient(135deg, #FF7043 0%, #E8507A 100%);
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-hover: 0 8px 40px rgba(232,80,122,0.25);
  --transition: all 0.25s 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;
  background: var(--bg-base);
  color: var(--text-white);
  line-height: 1.6;
  min-height: 100vh;
  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; }
input, select, textarea { font-family: inherit; }

/* ===== 公告栏 ===== */
.notice-bar {
  background: linear-gradient(90deg, #1A0A12 0%, #2D1520 50%, #1A0A12 100%);
  border-bottom: 1px solid var(--border);
  padding: 7px 0;
  overflow: hidden;
}
.notice-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.notice-label {
  background: var(--gradient-main);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}
.notice-scroll { overflow: hidden; flex: 1; }
.notice-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  animation: marquee 30s linear infinite;
  display: inline-block;
}
@keyframes marquee {
  0% { transform: translateX(100vw); }
  100% { transform: translateX(-100%); }
}

/* ===== 头部 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13,5,9,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
}
.logo-text {
  font-size: 1.2rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.02em;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.main-nav a {
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--primary-light);
  background: rgba(232,80,122,0.12);
}
.header-actions { display: flex; align-items: center; gap: 10px; }
.btn-login {
  background: var(--gradient-main);
  color: #fff;
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-login:hover { opacity: 0.88; transform: translateY(-1px); }
.menu-toggle {
  display: none;
  font-size: 1.3rem;
  color: var(--text-white);
  padding: 6px;
}

/* ===== 移动端导航 ===== */
.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.35s ease;
}
.mobile-nav.open { max-height: 400px; display: flex; }
.mobile-nav a {
  padding: 14px 24px;
  font-size: 0.95rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.mobile-nav a:hover { color: var(--primary-light); background: rgba(232,80,122,0.08); }

/* ===== 搜索栏 ===== */
.search-bar-wrap {
  background: var(--bg-card2);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
}
.search-bar-inner { max-width: 1280px; margin: 0 auto; }
.search-form {
  display: flex;
  gap: 0;
  max-width: 680px;
  border-radius: 24px;
  overflow: hidden;
  border: 1.5px solid var(--border);
  transition: var(--transition);
}
.search-form:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(232,80,122,0.15); }
.search-input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 11px 18px;
  font-size: 0.9rem;
  color: var(--text-white);
  outline: none;
}
.search-input::placeholder { color: var(--text-muted); }
.search-btn {
  background: var(--gradient-main);
  color: #fff;
  padding: 0 22px;
  font-size: 0.88rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}
.search-btn:hover { opacity: 0.88; }
.search-tags { display: flex; flex-wrap: wrap; gap: 8px; max-width: 1280px; margin: 0 auto; }
.search-tag {
  background: rgba(232,80,122,0.1);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 4px 12px;
  border-radius: 14px;
  font-size: 0.78rem;
  cursor: pointer;
  transition: var(--transition);
}
.search-tag:hover { color: var(--primary-light); border-color: var(--primary); background: rgba(232,80,122,0.15); }

/* ===== Hero首屏 ===== */
.hero-section {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('../assets/images/hero_banner.jpg') center/cover no-repeat;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,5,9,0.92) 0%, rgba(45,21,32,0.75) 50%, rgba(13,5,9,0.88) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 20px;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(232,80,122,0.18);
  border: 1px solid rgba(232,80,122,0.35);
  color: var(--primary-light);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 18px;
  color: var(--text-white);
}
.hero-title span {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 600px;
  line-height: 1.8;
  margin-bottom: 28px;
}
.hero-stats {
  display: flex;
  gap: 32px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.hero-stat-item { text-align: left; }
.hero-stat-num {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat-label { font-size: 0.78rem; color: var(--text-muted); }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  padding: 13px 28px;
  border-radius: 26px;
  font-size: 0.95rem;
  font-weight: 700;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  cursor: pointer;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(232,80,122,0.45); }
.btn-outline {
  background: transparent;
  color: var(--text-white);
  padding: 12px 28px;
  border-radius: 26px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1.5px solid rgba(255,255,255,0.3);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary-light); background: rgba(232,80,122,0.08); }

/* ===== 数据统计条 ===== */
.stats-bar {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 20px;
}
.stats-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 16px;
}
.stat-item { text-align: center; }
.stat-num {
  display: block;
  font-size: 1.4rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.78rem; color: var(--text-muted); }

/* ===== 通用Section ===== */
.section { padding: 60px 0; }
.section-inner { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 12px;
}
.section-title {
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 6px;
}
.section-subtitle { font-size: 0.85rem; color: var(--text-muted); }
.view-more {
  font-size: 0.85rem;
  color: var(--primary-light);
  transition: var(--transition);
  white-space: nowrap;
}
.view-more:hover { color: var(--primary); }

/* ===== 分类标签 ===== */
.category-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.cat-tab {
  padding: 7px 16px;
  border-radius: 18px;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.cat-tab:hover, .cat-tab.active {
  background: var(--gradient-main);
  color: #fff;
  border-color: transparent;
}

/* ===== 视频网格 ===== */
.video-grid { display: grid; gap: 20px; }
.video-grid-4 { grid-template-columns: repeat(4, 1fr); }
.video-grid-3 { grid-template-columns: repeat(3, 1fr); }

.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(232,80,122,0.35);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-card2);
}
.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);
  transition: var(--transition);
}
.video-card:hover .video-play-btn { background: rgba(0,0,0,0.45); }
.play-icon {
  width: 48px;
  height: 48px;
  background: rgba(232,80,122,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  opacity: 0;
  transform: scale(0.8);
  transition: var(--transition);
}
.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: 5px;
}
.video-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 5px;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-white);
  line-height: 1.5;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-author {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.author-avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.video-author span { font-size: 0.8rem; color: var(--text-muted); }
.video-stats {
  display: flex;
  gap: 12px;
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* ===== 直播网格 ===== */
.live-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.live-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.live-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.live-thumb {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
  background: var(--bg-card2);
}
.live-thumb img { width: 100%; height: 100%; object-fit: cover; }
.live-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: #E53935;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 5px;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}
.live-viewers {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 5px;
}
.live-info { padding: 12px; }
.live-name { font-size: 0.88rem; font-weight: 600; color: var(--text-white); margin-bottom: 4px; }
.live-topic { font-size: 0.78rem; color: var(--text-muted); }

/* ===== AI功能卡片 ===== */
.ai-features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.ai-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.ai-card:hover {
  border-color: rgba(232,80,122,0.4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.ai-icon { font-size: 2.2rem; margin-bottom: 14px; }
.ai-title { font-size: 1rem; font-weight: 700; color: var(--text-white); margin-bottom: 10px; }
.ai-desc { font-size: 0.84rem; color: var(--text-muted); line-height: 1.7; }

/* ===== 专家网格 ===== */
.expert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: rgba(232,80,122,0.35); }
.expert-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 14px;
  border: 2px solid var(--border);
}
.expert-name { font-size: 1rem; font-weight: 700; color: var(--text-white); margin-bottom: 4px; }
.expert-title { font-size: 0.8rem; color: var(--primary-light); margin-bottom: 10px; }
.expert-desc { font-size: 0.82rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 14px; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 14px; }
.expert-tag {
  background: rgba(232,80,122,0.12);
  border: 1px solid var(--border);
  color: var(--primary-light);
  padding: 3px 10px;
  border-radius: 10px;
  font-size: 0.74rem;
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  padding: 6px 14px;
  border-radius: 14px;
  font-size: 0.78rem;
  font-weight: 600;
  transition: var(--transition);
}
.btn-sm-primary { background: var(--gradient-main); color: #fff; }
.btn-sm-outline { background: transparent; color: var(--text-muted); border: 1px solid var(--border); }
.btn-sm-outline:hover { border-color: var(--primary); color: var(--primary-light); }

/* ===== 合作品牌 ===== */
.partner-section {
  background: var(--bg-card2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 32px 20px;
}
.partner-logos { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.partner-logo {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 10px 22px;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 500;
  transition: var(--transition);
}
.partner-logo:hover { border-color: var(--primary); color: var(--primary-light); }

/* ===== 加入步骤 ===== */
.join-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 50px; }
.join-step {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  border: 1px solid var(--border);
  position: relative;
}
.step-num {
  width: 44px;
  height: 44px;
  background: var(--gradient-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  margin: 0 auto 14px;
}
.step-title { font-size: 0.95rem; font-weight: 700; color: var(--text-white); margin-bottom: 8px; }
.step-desc { font-size: 0.82rem; color: var(--text-muted); line-height: 1.7; }

/* ===== FAQ ===== */
.faq-list { display: flex; flex-direction: column; gap: 10px; }
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(232,80,122,0.35); }
.faq-q {
  padding: 16px 20px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-white);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}
.faq-q::after { content: '+'; font-size: 1.2rem; color: var(--primary); flex-shrink: 0; }
.faq-item.open .faq-q::after { content: '−'; }
.faq-q:hover { color: var(--primary-light); }
.faq-a {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  font-size: 0.87rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 200px; padding: 0 20px 16px; }

/* ===== 联系我们 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info-list { display: flex; flex-direction: column; gap: 16px; }
.contact-item { display: flex; gap: 14px; align-items: flex-start; }
.contact-icon {
  width: 38px;
  height: 38px;
  background: rgba(232,80,122,0.12);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.contact-label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 0.9rem; color: var(--text-white); font-weight: 500; }

/* ===== 二维码 ===== */
.qrcode-group { display: flex; gap: 24px; flex-wrap: wrap; }
.qrcode-item { text-align: center; }
.qrcode-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 8px; }

/* ===== 评价 ===== */
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.review-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.review-card:hover { border-color: rgba(232,80,122,0.3); transform: translateY(-3px); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-size: 0.88rem; font-weight: 600; color: var(--text-white); }
.review-date { font-size: 0.75rem; color: var(--text-muted); }
.review-stars { color: #FFB300; font-size: 0.9rem; margin-bottom: 10px; }
.review-text { font-size: 0.84rem; color: var(--text-muted); line-height: 1.7; }

/* ===== 社交分享 ===== */
.social-share { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.share-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 0.84rem;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: var(--bg-card);
}
.share-btn:hover { border-color: var(--primary); color: var(--primary-light); }
.share-wechat:hover { border-color: #07C160; color: #07C160; }
.share-weibo:hover { border-color: #E6162D; color: #E6162D; }
.share-douyin:hover { border-color: #FE2C55; color: #FE2C55; }
.share-bilibili:hover { border-color: #00A1D6; color: #00A1D6; }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-card2);
  border-top: 1px solid var(--border);
  padding: 50px 0 0;
}
.footer-inner { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo-text { font-size: 1.3rem; display: block; margin-bottom: 14px; }
.footer-brand p { font-size: 0.84rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 10px; }
.footer-col h4 { font-size: 0.92rem; font-weight: 700; color: var(--text-white); margin-bottom: 14px; }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { font-size: 0.84rem; color: var(--text-muted); transition: var(--transition); }
.footer-links a:hover { color: var(--primary-light); }
.footer-divider { border: none; border-top: 1px solid var(--border); margin: 0; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); transition: var(--transition); }
.footer-bottom a:hover { color: var(--primary-light); }
.update-time { color: var(--primary-light); font-weight: 500; }

/* ===== 面包屑 ===== */
.breadcrumb {
  background: var(--bg-card2);
  border-bottom: 1px solid var(--border);
  padding: 10px 20px;
}
.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.breadcrumb-inner a { transition: var(--transition); }
.breadcrumb-inner a:hover { color: var(--primary-light); }
.breadcrumb-inner .sep { color: var(--border); }
.breadcrumb-inner .current { color: var(--primary-light); }

/* ===== 内页Hero ===== */
.inner-hero {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-card2) 100%);
  border-bottom: 1px solid var(--border);
  padding: 40px 20px;
}
.inner-hero-inner { max-width: 1280px; margin: 0 auto; }
.inner-hero h1 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 8px;
}
.inner-hero p { font-size: 0.9rem; color: var(--text-muted); }

/* ===== 分页 ===== */
.pagination {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 40px;
}
.page-btn {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.page-btn:hover, .page-btn.active {
  background: var(--gradient-main);
  color: #fff;
  border-color: transparent;
}

/* ===== 社区美图网格 ===== */
.community-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.community-post {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.community-post:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.post-img { aspect-ratio: 3/4; overflow: hidden; }
.post-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.community-post:hover .post-img img { transform: scale(1.06); }
.post-info { padding: 12px; }
.post-title { font-size: 0.82rem; color: var(--text-white); margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-footer { display: flex; justify-content: space-between; font-size: 0.76rem; color: var(--text-muted); }

/* ===== 媒体网格 ===== */
.media-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: var(--gradient-main);
  color: #fff;
  border-radius: 50%;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 16px rgba(232,80,122,0.4);
  border: none;
  cursor: pointer;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-3px); box-shadow: 0 6px 24px rgba(232,80,122,0.5); }

/* ===== 懒加载 ===== */
img[data-src] { opacity: 0; transition: opacity 0.4s ease; }
img.loaded { opacity: 1; }

/* ===== 视频卡片补充样式（首页重构后新增） ===== */
.video-card-link { display: block; text-decoration: none; color: inherit; }
.video-card-link:hover .video-thumb img { transform: scale(1.06); }
.video-date { display: block; font-size: 0.72rem; color: var(--text-muted); margin-top: 6px; font-style: normal; }
.video-title a { color: var(--text-white); text-decoration: none; transition: color 0.2s; }
.video-title a:hover { color: var(--primary-light); }
/* ===== main标签语义样式 ===== */
main#main-content { display: block; }
/* ===== 首页视频预览 ===== */
.homepage-video-preview video { display: block; }
/* ===== 面包屑链接 ===== */
.breadcrumb a { color: var(--text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--primary-light); }

/* ===== 响应式 ===== */
@media (max-width: 1200px) {
  .video-grid-4 { grid-template-columns: repeat(3, 1fr); }
  .ai-features { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .video-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .live-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .join-steps { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: repeat(3, 1fr); }
  .media-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .menu-toggle { display: block; }
  .mobile-nav { display: flex; }
  .hero-section { min-height: 420px; }
  .hero-stats { gap: 20px; }
  .video-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .ai-features { grid-template-columns: 1fr 1fr; }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .join-steps { grid-template-columns: 1fr 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-bar-inner { gap: 20px; }
}

@media (max-width: 480px) {
  .video-grid-4 { grid-template-columns: 1fr 1fr; gap: 12px; }
  .live-grid { grid-template-columns: 1fr 1fr; }
  .ai-features { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr 1fr; }
  .join-steps { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr 1fr; }
  .hero-btns { flex-direction: column; }
  .hero-stats { gap: 14px; }
  .section { padding: 40px 0; }
}