/*
 * 看片 - 主样式文件
 * 设计风格：深红极简·高端传媒风
 * 主色：#C8102E（品牌深红）| 背景：#0F0F0F（纯黑）| 金色点缀：#D4AF37
 * 字体：Noto Serif SC（标题）+ Noto Sans SC（正文）
 */

/* ===== 字体引入 ===== */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;700;900&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

/* ===== CSS变量 ===== */
:root {
  --primary:    #C8102E;
  --primary-dk: #9B0C23;
  --gold:       #D4AF37;
  --gold-lt:    #F0D060;
  --bg:         #0F0F0F;
  --bg-card:    #1A1A1A;
  --bg-card2:   #222222;
  --text:       #F5F5F5;
  --text-muted: #AAAAAA;
  --border:     #2E2E2E;
  --red-line:   3px solid #C8102E;
  --radius:     6px;
  --shadow:     0 4px 24px rgba(0,0,0,0.6);
  --transition: 0.22s cubic-bezier(0.23,1,0.32,1);
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: color var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ===== 通用工具类 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 70px 0; }
.section-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 2rem;
  font-weight: 900;
  color: var(--text);
  margin-bottom: 8px;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--primary);
  margin-top: 8px;
}
.section-subtitle { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 40px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-dk); }
.btn-outline {
  border: 1px solid var(--primary);
  color: var(--primary);
}
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-gold {
  background: var(--gold);
  color: #0F0F0F;
  font-weight: 700;
}
.btn-gold:hover { background: var(--gold-lt); }
.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  background: rgba(200,16,46,0.18);
  color: var(--primary);
  border: 1px solid rgba(200,16,46,0.3);
}
.gold-text { color: var(--gold); }
.red-text  { color: var(--primary); }
.divider {
  width: 100%;
  height: 1px;
  background: var(--border);
  margin: 40px 0;
}

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: var(--primary);
  color: #fff;
  font-size: 0.82rem;
  padding: 6px 0;
  text-align: center;
  letter-spacing: 0.05em;
}
.top-bar a { color: var(--gold-lt); }

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15,15,15,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 20px;
}
.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.navbar-logo img.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--primary);
}
.navbar-logo .brand-name {
  font-family: 'Noto Serif SC', serif;
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--text);
}
.navbar-logo .brand-name span { color: var(--primary); }
.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.navbar-nav a {
  padding: 6px 14px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--text-muted);
  position: relative;
  transition: color var(--transition);
}
.navbar-nav a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 14px; right: 14px;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.navbar-nav a:hover, .navbar-nav a.active { color: var(--text); }
.navbar-nav a:hover::after, .navbar-nav a.active::after { transform: scaleX(1); }
.navbar-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.navbar-actions .btn { padding: 7px 18px; font-size: 0.85rem; }
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text); transition: all 0.3s; }

/* ===== 搜索栏 ===== */
.search-bar-wrap {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 700px;
  margin: 0 auto;
}
.search-input-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 0 16px;
  transition: border-color var(--transition);
}
.search-input-wrap:focus-within { border-color: var(--primary); }
.search-input-wrap svg { color: var(--text-muted); flex-shrink: 0; }
.search-input-wrap input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 0.9rem;
  padding: 9px 10px;
  font-family: inherit;
}
.search-input-wrap input::placeholder { color: var(--text-muted); }
.search-btn {
  background: var(--primary);
  color: #fff;
  border-radius: 24px;
  padding: 9px 22px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background var(--transition);
}
.search-btn:hover { background: var(--primary-dk); }
.search-hot-tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 8px; font-size: 0.8rem; color: var(--text-muted); }
.search-hot-tags a { color: var(--text-muted); }
.search-hot-tags a:hover { color: var(--primary); }

/* ===== 英雄区 ===== */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero_banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(15,15,15,0.92) 0%, rgba(15,15,15,0.5) 60%, transparent 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 620px;
  padding: 80px 0;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(200,16,46,0.2);
  border: 1px solid rgba(200,16,46,0.4);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  margin-bottom: 20px;
}
.hero-title {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 16px;
}
.hero-title em { color: var(--primary); font-style: normal; }
.hero-desc {
  color: rgba(245,245,245,0.8);
  font-size: 1rem;
  margin-bottom: 32px;
  max-width: 480px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 36px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.hero-stat-num {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--gold);
}
.hero-stat-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(200,16,46,0.4);
}
.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-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.video-card:hover .video-play-overlay { background: rgba(0,0,0,0.45); }
.play-btn {
  width: 52px;
  height: 52px;
  background: var(--primary);
  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 0 20px rgba(200,16,46,0.6);
}
.video-card:hover .play-btn { opacity: 1; transform: scale(1); }
.play-btn svg { color: #fff; margin-left: 3px; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 3px;
}
.video-quality {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 3px;
  font-weight: 700;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}
.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.video-meta-left { display: flex; align-items: center; gap: 10px; }
.video-meta-item { display: flex; align-items: center; gap: 3px; }
.video-author { display: flex; align-items: center; gap: 6px; margin-top: 8px; }
.video-author-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  color: #fff;
  font-weight: 700;
}
.video-author-name { font-size: 0.78rem; color: var(--text-muted); }

/* ===== 分类标签栏 ===== */
.category-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.cat-tab {
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: var(--bg-card);
  transition: all var(--transition);
}
.cat-tab:hover, .cat-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ===== 专家展示 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}
.expert-card:hover { transform: translateY(-4px); border-color: var(--gold); }
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  object-fit: cover;
  border: 3px solid var(--primary);
}
.expert-avatar-placeholder {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dk));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: #fff;
  font-weight: 700;
  border: 3px solid var(--primary);
}
.expert-name {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.expert-role { font-size: 0.82rem; color: var(--primary); margin-bottom: 10px; }
.expert-desc { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 14px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 4px; justify-content: center; margin-bottom: 14px; }
.expert-award {
  font-size: 0.72rem;
  padding: 2px 8px;
  background: rgba(212,175,55,0.12);
  border: 1px solid rgba(212,175,55,0.3);
  color: var(--gold);
  border-radius: 3px;
}
.expert-actions { display: flex; gap: 8px; justify-content: center; }
.expert-actions .btn { padding: 6px 14px; font-size: 0.8rem; }

/* ===== 合作品牌 ===== */
.partner-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: center;
}
.partner-logo {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: all var(--transition);
  min-width: 120px;
  text-align: center;
  font-weight: 500;
}
.partner-logo:hover { border-color: var(--primary); color: var(--text); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--bg-card);
  cursor: pointer;
  font-weight: 500;
  font-size: 0.95rem;
  transition: background var(--transition);
}
.faq-q:hover { background: var(--bg-card2); }
.faq-q .faq-icon {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  transition: transform 0.3s;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-a {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; padding: 14px 20px; }

/* ===== 用户评价 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  position: relative;
}
.review-card::before {
  content: '"';
  position: absolute;
  top: 10px;
  right: 16px;
  font-size: 4rem;
  color: rgba(200,16,46,0.15);
  font-family: serif;
  line-height: 1;
}
.review-stars { color: var(--gold); font-size: 0.9rem; margin-bottom: 10px; }
.review-text { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 14px; }
.review-user { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), #6B21A8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: #fff;
  font-weight: 700;
}
.review-name { font-size: 0.85rem; font-weight: 500; }
.review-date { font-size: 0.75rem; color: var(--text-muted); }

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info-block { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.contact-icon {
  width: 40px;
  height: 40px;
  background: rgba(200,16,46,0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--primary);
}
.contact-label { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 0.92rem; font-weight: 500; }
.qr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.qr-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.qr-placeholder {
  width: 100px;
  height: 100px;
  margin: 0 auto 10px;
  background: var(--bg-card2);
  border: 1px dashed var(--border);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--text-muted);
}
.qr-label { font-size: 0.85rem; color: var(--text-muted); }

/* ===== 页脚 ===== */
.footer {
  background: #080808;
  border-top: 1px solid var(--border);
  padding: 50px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .brand-name {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.3rem;
  font-weight: 900;
  margin-bottom: 10px;
}
.footer-brand .brand-name span { color: var(--primary); }
.footer-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 16px; }
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: all var(--transition);
}
.social-btn:hover { background: var(--primary); border-color: var(--primary); color: #fff; }
.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { font-size: 0.85rem; color: var(--text-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }
.update-time { color: var(--gold); }

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 14px 0;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--border); }
.breadcrumb .current { color: var(--text); }

/* ===== 分页 ===== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 40px;
}
.page-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.page-btn:hover, .page-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ===== 统计数字区 ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 50px 0;
}
.stat-item {
  background: var(--bg-card);
  padding: 28px 20px;
  text-align: center;
}
.stat-num {
  font-family: 'Noto Serif SC', serif;
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label { font-size: 0.82rem; color: var(--text-muted); }

/* ===== AI赋能区 ===== */
.ai-section {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 360px;
}
.ai-section-img {
  position: relative;
  overflow: hidden;
}
.ai-section-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.6);
}
.ai-section-content {
  padding: 48px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.ai-feature-list { display: flex; flex-direction: column; gap: 14px; margin: 20px 0; }
.ai-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.ai-feature-icon {
  width: 32px;
  height: 32px;
  background: rgba(200,16,46,0.15);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--primary);
  font-size: 0.9rem;
}
.ai-feature-text h5 { font-size: 0.9rem; font-weight: 600; margin-bottom: 2px; }
.ai-feature-text p { font-size: 0.82rem; color: var(--text-muted); }

/* ===== 社区功能区 ===== */
.community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.community-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}
.community-card:hover { transform: translateY(-4px); border-color: var(--primary); }
.community-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(200,16,46,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.5rem;
  color: var(--primary);
}
.community-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.community-desc { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; }

/* ===== 加入指南 ===== */
.how-to-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}
.how-to-steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 12%;
  right: 12%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--gold));
  z-index: 0;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  position: relative;
  z-index: 1;
}
.step-num {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  border: 3px solid var(--bg);
}
.step-title { font-size: 0.9rem; font-weight: 700; margin-bottom: 6px; }
.step-desc { font-size: 0.8rem; color: var(--text-muted); line-height: 1.6; }

/* ===== 滚动动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== 移动端菜单 ===== */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0,0,0,0.8);
}
.mobile-menu.open { display: flex; }
.mobile-menu-panel {
  background: var(--bg-card);
  width: 280px;
  height: 100%;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}
.mobile-menu-panel a {
  display: block;
  padding: 12px 16px;
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: all var(--transition);
}
.mobile-menu-panel a:hover { background: rgba(200,16,46,0.1); color: var(--text); }
.mobile-menu-close {
  align-self: flex-end;
  background: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  margin-bottom: 16px;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .how-to-steps { grid-template-columns: repeat(2, 1fr); }
  .how-to-steps::before { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
  .ai-section { grid-template-columns: 1fr; }
  .ai-section-img { min-height: 200px; }
}
@media (max-width: 768px) {
  .navbar-nav, .navbar-actions { display: none; }
  .hamburger { display: flex; }
  .hero-content { padding: 50px 0; }
  .hero-stats { gap: 20px; flex-wrap: wrap; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
  .community-grid { grid-template-columns: 1fr 1fr; }
  .expert-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 50px 0; }
  .section-title { font-size: 1.6rem; }
}
@media (max-width: 480px) {
  .community-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .qr-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.8rem; }
  .search-bar-inner { flex-direction: column; }
}