/* =============================================
   糖心vlog - 主样式文件
   Brand: 糖心vlog | Domain: hb5566.cn
   ============================================= */

/* ---- CSS 变量 ---- */
:root {
  --primary: #E8336D;
  --primary-dark: #C0235A;
  --secondary: #F5A623;
  --accent: #9B59B6;
  --dark: #0D1B2A;
  --dark2: #1A2940;
  --dark3: #243352;
  --text-main: #1A1A2E;
  --text-muted: #6B7280;
  --text-light: #F8F9FA;
  --bg-light: #F9F0F5;
  --bg-white: #FFFFFF;
  --border: #E8D5E0;
  --gradient-main: linear-gradient(135deg, #E8336D 0%, #F5A623 100%);
  --gradient-dark: linear-gradient(135deg, #0D1B2A 0%, #1A2940 100%);
  --shadow-sm: 0 2px 8px rgba(232,51,109,0.12);
  --shadow-md: 0 4px 20px rgba(232,51,109,0.18);
  --shadow-lg: 0 8px 40px rgba(232,51,109,0.22);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- 基础重置 ---- */
*, *::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;
  color: var(--text-main);
  background: var(--bg-white);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ---- 顶部公告栏 ---- */
.top-bar {
  background: var(--gradient-main);
  color: #fff;
  text-align: center;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
}
.top-bar a { color: #fff; text-decoration: underline; }

/* ---- 导航栏 ---- */
.navbar {
  background: var(--bg-white);
  box-shadow: 0 2px 16px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}
.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.navbar-brand .site-favicon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: cover;
}
.navbar-brand .site-logo {
  height: 42px;
  width: auto;
}
.navbar-brand .brand-text {
  font-size: 20px;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-menu a {
  color: var(--text-main);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 8px;
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--primary);
  background: var(--bg-light);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.btn-nav-join {
  background: var(--gradient-main);
  color: #fff !important;
  padding: 8px 20px !important;
  border-radius: 20px !important;
  font-weight: 600 !important;
  font-size: 14px !important;
}
.btn-nav-join:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  color: #fff !important;
  background: var(--gradient-main) !important;
}
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- 搜索栏 ---- */
.search-bar-wrap {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 10px 20px;
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.search-form {
  display: flex;
  align-items: center;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 24px;
  overflow: hidden;
  flex: 1;
  max-width: 600px;
  transition: var(--transition);
}
.search-form:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232,51,109,0.1);
}
.search-form input {
  flex: 1;
  border: none;
  outline: none;
  padding: 10px 18px;
  font-size: 14px;
  background: transparent;
  color: var(--text-main);
  font-family: inherit;
}
.search-form button {
  background: var(--gradient-main);
  border: none;
  padding: 10px 20px;
  color: #fff;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  font-family: inherit;
}
.search-form button:hover { opacity: 0.9; }
.search-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.search-tag {
  font-size: 12px;
  color: var(--text-muted);
  background: #fff;
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
}
.search-tag:hover {
  color: var(--primary);
  border-color: var(--primary);
}

/* ---- 面包屑 ---- */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 20px;
  font-size: 13px;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ---- 通用容器 ---- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.section { padding: 60px 0; }
.section-sm { padding: 40px 0; }
.section-title {
  text-align: center;
  margin-bottom: 40px;
}
.section-title h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
  position: relative;
  display: inline-block;
}
.section-title h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--gradient-main);
  border-radius: 2px;
  margin: 10px auto 0;
}
.section-title p {
  color: var(--text-muted);
  font-size: 16px;
  max-width: 600px;
  margin: 0 auto;
}
.section-label {
  display: inline-block;
  background: var(--bg-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ---- Hero 区域 ---- */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--gradient-dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero_banner.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.35;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(13,27,42,0.95) 0%, rgba(13,27,42,0.5) 60%, transparent 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 20px;
  max-width: 700px;
  padding-left: 60px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(232,51,109,0.2);
  border: 1px solid rgba(232,51,109,0.4);
  color: #F5A623;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 48px;
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 16px;
}
.hero h1 .highlight {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: 18px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
  max-width: 520px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 28px;
  font-weight: 900;
  color: #fff;
  display: block;
}
.hero-stat .label {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
}

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  font-family: inherit;
  text-decoration: none;
}
.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.5);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
  color: #fff;
}
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn-ghost {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-ghost:hover {
  background: var(--primary);
  color: #fff;
}

/* ---- 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);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: 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: var(--dark);
}
.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);
  opacity: 0;
}
.video-card:hover .video-play-btn { opacity: 1; background: rgba(0,0,0,0.35); }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(232,51,109,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
  backdrop-filter: blur(4px);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 10px;
}
.video-info {
  padding: 14px 16px;
}
.video-info h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  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: 13px;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 10px;
}
.video-tag {
  font-size: 11px;
  color: var(--primary);
  background: var(--bg-light);
  padding: 2px 8px;
  border-radius: 8px;
  font-weight: 500;
}

/* ---- 特色卡片 ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.feature-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
  text-align: center;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}
.feature-icon {
  width: 60px;
  height: 60px;
  background: var(--bg-light);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 28px;
  transition: var(--transition);
}
.feature-card:hover .feature-icon {
  background: var(--gradient-main);
}
.feature-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}
.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---- 专家卡片 ---- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}
.expert-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border);
}
.expert-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}
.expert-photo {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
}
.expert-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.expert-card:hover .expert-photo img { transform: scale(1.05); }
.expert-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(13,27,42,0.85));
  padding: 20px 16px 16px;
  transform: translateY(100%);
  transition: var(--transition);
}
.expert-card:hover .expert-overlay { transform: translateY(0); }
.expert-overlay .btn { width: 100%; justify-content: center; font-size: 13px; padding: 8px; }
.expert-info { padding: 16px; }
.expert-info h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 4px;
}
.expert-title {
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 8px;
}
.expert-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}
.expert-awards {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.award-tag {
  font-size: 11px;
  background: var(--bg-light);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 8px;
  font-weight: 500;
}

/* ---- 评价区域 ---- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.review-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
}
.review-user h4 { font-size: 15px; font-weight: 700; margin-bottom: 2px; }
.review-user .meta { font-size: 12px; color: var(--text-muted); }
.review-stars { color: #F5A623; font-size: 14px; margin-bottom: 10px; }
.review-text { font-size: 14px; color: var(--text-main); line-height: 1.7; }
.review-date { font-size: 12px; color: var(--text-muted); margin-top: 10px; }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border-radius: var(--radius);
  margin-bottom: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: var(--primary); }
.faq-question {
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  user-select: none;
}
.faq-question:hover { color: var(--primary); }
.faq-arrow {
  width: 24px;
  height: 24px;
  background: var(--bg-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  font-size: 12px;
  color: var(--primary);
}
.faq-item.open .faq-arrow { transform: rotate(180deg); background: var(--primary); color: #fff; }
.faq-answer {
  display: none;
  padding: 0 24px 18px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.faq-item.open .faq-answer { display: block; }

/* ---- 合作品牌墙 ---- */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
  min-width: 120px;
  text-align: center;
}
.partner-item:hover {
  color: var(--primary);
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

/* ---- 社区功能卡片 ---- */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}
.community-card {
  background: var(--gradient-dark);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  color: #fff;
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.08);
}
.community-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 8px 24px rgba(232,51,109,0.25);
}
.community-icon { font-size: 36px; margin-bottom: 12px; }
.community-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.community-card p { font-size: 13px; color: rgba(255,255,255,0.65); line-height: 1.6; }

/* ---- 联系区域 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info h3 {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--text-main);
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
  padding: 16px;
  background: var(--bg-light);
  border-radius: var(--radius);
}
.contact-item-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-main);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-item-text h4 { font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.contact-item-text p { font-size: 14px; color: var(--text-muted); }
.qr-group {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}
.qr-item {
  text-align: center;
}
.qr-item img {
  width: 130px;
  height: 130px;
  border-radius: var(--radius);
  border: 3px solid var(--border);
  object-fit: cover;
}
.qr-item p {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 8px;
  font-weight: 600;
}

/* ---- 社交分享 ---- */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 14px; font-weight: 600; color: var(--text-muted); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  font-family: inherit;
}
.share-wechat { background: #07C160; color: #fff; }
.share-weibo { background: #E6162D; color: #fff; }
.share-douyin { background: #010101; color: #fff; }
.share-bilibili { background: #00A1D6; color: #fff; }
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; }

/* ---- 页脚 ---- */
.footer {
  background: var(--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;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .footer-logo {
  height: 48px;
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255,255,255,0.6);
  margin-bottom: 20px;
}
.footer-social {
  display: flex;
  gap: 10px;
}
.footer-social a {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.08);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  font-size: 16px;
  transition: var(--transition);
}
.footer-social a:hover {
  background: var(--primary);
  color: #fff;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--primary); padding-left: 4px; }
.footer-bottom {
  padding: 20px;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--primary); }

/* ---- 标签页 ---- */
.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 28px;
  overflow-x: auto;
}
.tab-btn {
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  background: transparent;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: var(--transition);
  white-space: nowrap;
  font-family: inherit;
}
.tab-btn:hover { color: var(--primary); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ---- 统计数字 ---- */
.stats-bar {
  background: var(--gradient-main);
  padding: 40px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-item .num {
  font-size: 36px;
  font-weight: 900;
  color: #fff;
  display: block;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-item .label {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
}

/* ---- 内容区域背景 ---- */
.bg-light { background: var(--bg-light); }
.bg-dark { background: var(--dark); }
.bg-gradient { background: var(--gradient-main); }

/* ---- 加入社区引导 ---- */
.join-section {
  background: var(--gradient-dark);
  border-radius: var(--radius-lg);
  padding: 50px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.join-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(232,51,109,0.15) 0%, transparent 60%);
  pointer-events: none;
}
.join-section h2 {
  font-size: 32px;
  font-weight: 900;
  color: #fff;
  margin-bottom: 14px;
}
.join-section p {
  font-size: 16px;
  color: rgba(255,255,255,0.75);
  margin-bottom: 28px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}
.join-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 32px 0;
  text-align: left;
}
.join-step {
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid rgba(255,255,255,0.1);
}
.step-num {
  width: 32px;
  height: 32px;
  background: var(--gradient-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 14px;
  margin-bottom: 12px;
}
.join-step h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.join-step p { font-size: 13px; color: rgba(255,255,255,0.6); }

/* ---- 图片画廊 ---- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.gallery-item {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3/4;
  position: relative;
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.gallery-item:hover img { transform: scale(1.06); }
.gallery-item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(transparent 50%, rgba(13,27,42,0.8));
  opacity: 0;
  transition: var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 16px;
}
.gallery-item:hover .gallery-item-overlay { opacity: 1; }
.gallery-item-overlay span {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
}

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .join-steps { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .hero-content { padding: 60px 20px; }
  .hero-stats { gap: 24px; }
  .section { padding: 40px 0; }
  .section-title h2 { font-size: 24px; }
  .nav-menu { display: none; }
  .nav-hamburger { display: flex; }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    padding: 16px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    z-index: 999;
    gap: 4px;
  }
  .footer-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { justify-content: center; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 26px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---- 懒加载占位 ---- */
img[loading="lazy"] { background: var(--bg-light); }

/* ---- 滚动条美化 ---- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-light); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ---- 选中颜色 ---- */
::selection { background: rgba(232,51,109,0.2); color: var(--primary-dark); }

/* ---- 内页横幅 ---- */
.page-banner {
  background: var(--gradient-dark);
  padding: 60px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../images/hero_banner.jpg') center/cover;
  opacity: 0.15;
}
.page-banner .container { position: relative; z-index: 1; }
.page-banner h1 {
  font-size: 36px;
  font-weight: 900;
  color: #fff;
  margin-bottom: 12px;
}
.page-banner p {
  font-size: 16px;
  color: rgba(255,255,255,0.7);
  max-width: 500px;
  margin: 0 auto;
}

/* ---- 文章内容 ---- */
.article-content {
  max-width: 860px;
  margin: 0 auto;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-main);
}
.article-content h2 {
  font-size: 24px;
  font-weight: 800;
  margin: 32px 0 16px;
  color: var(--text-main);
}
.article-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 24px 0 12px;
  color: var(--text-main);
}
.article-content p { margin-bottom: 16px; }

/* ---- 通知提示 ---- */
.notice-bar {
  background: rgba(232,51,109,0.08);
  border-left: 4px solid var(--primary);
  padding: 14px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 14px;
  color: var(--text-main);
  margin: 16px 0;
}

/* ---- 加载动画 ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.6s ease forwards; }
.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }