/* =============================================
   体育生 - 主样式文件
   Brand: 体育生 | Domain: 892593.cn
   ============================================= */

/* CSS变量 - 原创配色方案 */
:root {
  --primary: #1a1f3a;
  --secondary: #e8304a;
  --accent: #f5a623;
  --accent2: #00c9a7;
  --bg-dark: #0d1020;
  --bg-card: #1e2340;
  --bg-light: #f8f9fc;
  --text-main: #1a1f3a;
  --text-muted: #6b7280;
  --text-light: #ffffff;
  --border: #e2e8f0;
  --gradient1: linear-gradient(135deg, #1a1f3a 0%, #2d3561 100%);
  --gradient2: linear-gradient(135deg, #e8304a 0%, #f5a623 100%);
  --gradient3: linear-gradient(135deg, #00c9a7 0%, #0096c7 100%);
  --shadow: 0 4px 20px rgba(26,31,58,0.12);
  --shadow-hover: 0 8px 40px rgba(26,31,58,0.22);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

/* 全局重置 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-main);
  background: var(--bg-light);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: 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; }

/* =============================================
   顶部公告栏
   ============================================= */
.top-bar {
  background: var(--gradient2);
  color: #fff;
  text-align: center;
  padding: 8px 20px;
  font-size: 13px;
  letter-spacing: 0.5px;
}
.top-bar a { color: #fff; text-decoration: underline; }

/* =============================================
   头部导航
   ============================================= */
.site-header {
  background: var(--primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 70px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  width: 44px;
  height: 44px;
  background: var(--gradient2);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 900;
  color: #fff;
  letter-spacing: -1px;
}
.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.logo-text .brand { font-size: 20px; font-weight: 800; color: #fff; }
.logo-text .slogan { font-size: 11px; color: rgba(255,255,255,0.6); }

.main-nav { flex: 1; }
.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}
.main-nav a {
  color: rgba(255,255,255,0.85);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 8px;
  white-space: nowrap;
  transition: var(--transition);
}
.main-nav a:hover,
.main-nav a.active {
  background: rgba(232,48,74,0.2);
  color: var(--secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.btn-join {
  background: var(--gradient2);
  color: #fff;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-join:hover { transform: translateY(-1px); box-shadow: 0 4px 15px rgba(232,48,74,0.4); }

/* 汉堡菜单 */
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 5px; }
.hamburger span { display: block; width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: var(--transition); }

/* =============================================
   搜索框
   ============================================= */
.search-bar-wrap {
  background: #252b4a;
  padding: 14px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-form {
  display: flex;
  flex: 1;
  max-width: 600px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 24px;
  overflow: hidden;
  transition: var(--transition);
}
.search-form:focus-within {
  border-color: var(--secondary);
  background: rgba(255,255,255,0.12);
}
.search-form input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  padding: 10px 18px;
  color: #fff;
  font-size: 14px;
}
.search-form input::placeholder { color: rgba(255,255,255,0.4); }
.search-form button {
  background: var(--secondary);
  color: #fff;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}
.search-form button:hover { background: #c5273f; }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-tag {
  color: rgba(255,255,255,0.5);
  font-size: 12px;
  padding: 3px 10px;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
}
.search-tag:hover { color: var(--accent); border-color: var(--accent); }

/* =============================================
   面包屑
   ============================================= */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--secondary); }
.breadcrumb .sep { color: #ccc; }
.breadcrumb .current { color: var(--secondary); }

/* =============================================
   Hero 首屏横幅
   ============================================= */
.hero {
  position: relative;
  min-height: 580px;
  background: var(--gradient1);
  overflow: hidden;
  display: flex;
  align-items: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero_banner.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.25;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,16,32,0.9) 0%, rgba(26,31,58,0.7) 50%, rgba(13,16,32,0.85) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(232,48,74,0.2);
  border: 1px solid rgba(232,48,74,0.4);
  color: var(--secondary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 16px;
}
.hero h1 em { color: var(--secondary); font-style: normal; }
.hero p {
  color: rgba(255,255,255,0.75);
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 32px;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  background: var(--gradient2);
  color: #fff;
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 700;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(232,48,74,0.5); }
.btn-outline {
  background: transparent;
  color: #fff;
  padding: 13px 28px;
  border: 2px solid rgba(255,255,255,0.4);
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 40px;
}
.hero-stat .num { font-size: 28px; font-weight: 900; color: var(--accent); }
.hero-stat .label { font-size: 12px; color: rgba(255,255,255,0.5); margin-top: 2px; }

.hero-visual { position: relative; }
.hero-video-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(10px);
}
.hero-video-card img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.hero-video-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
  border-radius: var(--radius-lg);
}
.hero-video-card:hover .hero-video-overlay { opacity: 1; }
.play-btn-lg {
  width: 70px;
  height: 70px;
  background: rgba(232,48,74,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.play-btn-lg:hover { transform: scale(1.1); }
.play-btn-lg svg { width: 28px; height: 28px; fill: #fff; margin-left: 4px; }

/* =============================================
   通用区块样式
   ============================================= */
.section { padding: 70px 20px; }
.section-inner { max-width: 1280px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-tag {
  display: inline-block;
  background: rgba(232,48,74,0.1);
  color: var(--secondary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
  border: 1px solid rgba(232,48,74,0.2);
}
.section h2 {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 12px;
}
.section h2 em { color: var(--secondary); font-style: normal; }
.section-desc { color: var(--text-muted); font-size: 15px; max-width: 600px; margin: 0 auto; }

.section-dark { background: var(--bg-dark); }
.section-dark .section h2 { color: #fff; }
.section-dark .section-desc { color: rgba(255,255,255,0.6); }

.section-gray { background: #f0f2f8; }

/* =============================================
   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);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #1a1f3a;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.video-play-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-overlay { opacity: 1; }
.play-btn {
  width: 52px;
  height: 52px;
  background: rgba(232,48,74,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.play-btn:hover { transform: scale(1.15); background: var(--secondary); }
.play-btn svg { width: 20px; height: 20px; fill: #fff; margin-left: 3px; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 12px;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--secondary);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
}
.video-info { padding: 14px 16px; }
.video-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--primary);
  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: 12px;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-meta svg { width: 13px; height: 13px; fill: currentColor; }
.video-author {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
.author-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: #fff;
  font-weight: 700;
  flex-shrink: 0;
}
.author-name { font-size: 12px; color: var(--text-muted); }

/* =============================================
   图片卡片
   ============================================= */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.photo-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3/4;
  cursor: pointer;
}
.photo-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.photo-card:hover img { transform: scale(1.08); }
.photo-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 50%);
  opacity: 0;
  transition: var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 16px;
}
.photo-card:hover .photo-overlay { opacity: 1; }
.photo-overlay span { color: #fff; font-size: 14px; font-weight: 600; }

/* =============================================
   功能模块卡片
   ============================================= */
.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);
  transition: var(--transition);
  border: 1px solid var(--border);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--secondary);
}
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  font-size: 24px;
}
.feature-icon.red { background: rgba(232,48,74,0.1); }
.feature-icon.blue { background: rgba(0,150,199,0.1); }
.feature-icon.green { background: rgba(0,201,167,0.1); }
.feature-icon.orange { background: rgba(245,166,35,0.1); }
.feature-card h3 { font-size: 17px; font-weight: 700; color: var(--primary); margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

/* =============================================
   专家展示
   ============================================= */
.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);
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.expert-photo {
  position: relative;
  height: 220px;
  overflow: hidden;
}
.expert-photo img { width: 100%; height: 100%; object-fit: cover; }
.expert-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--gradient2);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 12px;
}
.expert-info { padding: 20px; }
.expert-name { font-size: 18px; font-weight: 800; color: var(--primary); margin-bottom: 4px; }
.expert-title { font-size: 13px; color: var(--secondary); font-weight: 600; margin-bottom: 12px; }
.expert-desc { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-bottom: 14px; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.expert-tag {
  background: var(--bg-light);
  color: var(--text-muted);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.expert-btns { display: flex; gap: 10px; }
.btn-sm {
  flex: 1;
  text-align: center;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-sm.primary { background: var(--secondary); color: #fff; }
.btn-sm.primary:hover { background: #c5273f; }
.btn-sm.outline { border: 1px solid var(--border); color: var(--text-muted); }
.btn-sm.outline:hover { border-color: var(--secondary); color: var(--secondary); }

/* =============================================
   合作品牌Logo墙
   ============================================= */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}
.partner-logo {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
  min-width: 120px;
  text-align: center;
}
.partner-logo:hover { border-color: var(--secondary); color: var(--secondary); transform: scale(1.05); }

/* =============================================
   FAQ
   ============================================= */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.active { border-color: var(--secondary); }
.faq-q {
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary);
  gap: 12px;
}
.faq-q:hover { color: var(--secondary); }
.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  font-size: 18px;
  color: var(--secondary);
}
.faq-item.active .faq-icon { background: var(--secondary); color: #fff; transform: rotate(45deg); }
.faq-a {
  display: none;
  padding: 0 22px 18px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.active .faq-a { display: block; }

/* =============================================
   用户评论
   ============================================= */
.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);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.reviewer-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}
.reviewer-info .name { font-size: 15px; font-weight: 700; color: var(--primary); }
.reviewer-info .date { font-size: 12px; color: var(--text-muted); }
.stars { color: #f5a623; font-size: 14px; margin-bottom: 10px; }
.review-text { font-size: 14px; color: var(--text-muted); line-height: 1.7; }
.review-tag {
  display: inline-block;
  margin-top: 12px;
  background: rgba(232,48,74,0.08);
  color: var(--secondary);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 10px;
}

/* =============================================
   联系我们
   ============================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info-card {
  background: var(--gradient1);
  border-radius: var(--radius-lg);
  padding: 40px;
  color: #fff;
}
.contact-info-card h3 { font-size: 22px; font-weight: 800; margin-bottom: 8px; }
.contact-info-card p { color: rgba(255,255,255,0.7); margin-bottom: 28px; }
.contact-items { display: flex; flex-direction: column; gap: 16px; }
.contact-item { display: flex; align-items: flex-start; gap: 14px; }
.contact-icon {
  width: 40px;
  height: 40px;
  background: rgba(255,255,255,0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-item .label { font-size: 12px; color: rgba(255,255,255,0.5); }
.contact-item .value { font-size: 14px; color: #fff; font-weight: 600; }
.qr-codes { display: flex; gap: 20px; margin-top: 28px; }
.qr-item { text-align: center; }
.qr-box {
  width: 90px;
  height: 90px;
  background: #fff;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
  overflow: hidden;
}
.qr-box img { width: 80px; height: 80px; }
.qr-label { font-size: 11px; color: rgba(255,255,255,0.6); }

.contact-form-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow);
}
.contact-form-card h3 { font-size: 20px; font-weight: 800; color: var(--primary); margin-bottom: 24px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--primary); margin-bottom: 6px; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text-main);
  transition: var(--transition);
  outline: none;
  background: #fff;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus { border-color: var(--secondary); box-shadow: 0 0 0 3px rgba(232,48,74,0.08); }
.form-group textarea { resize: vertical; min-height: 100px; }
.btn-submit {
  width: 100%;
  background: var(--gradient2);
  color: #fff;
  padding: 14px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  transition: var(--transition);
}
.btn-submit:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(232,48,74,0.4); }

/* =============================================
   社区入口
   ============================================= */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}
.community-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.community-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--accent2); }
.community-icon { font-size: 36px; margin-bottom: 12px; }
.community-card h4 { font-size: 15px; font-weight: 700; color: var(--primary); margin-bottom: 6px; }
.community-card p { font-size: 12px; color: var(--text-muted); }
.community-btn {
  display: inline-block;
  margin-top: 14px;
  background: var(--gradient3);
  color: #fff;
  padding: 7px 18px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 600;
}

/* =============================================
   分享按钮
   ============================================= */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 14px; color: var(--text-muted); font-weight: 600; }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.share-btn:hover { transform: translateY(-2px); }
.share-btn.wechat:hover { background: #07c160; color: #fff; border-color: #07c160; }
.share-btn.weibo:hover { background: #e6162d; color: #fff; border-color: #e6162d; }
.share-btn.douyin:hover { background: #000; color: #fff; border-color: #000; }
.share-btn.bilibili:hover { background: #00a1d6; color: #fff; border-color: #00a1d6; }

/* =============================================
   How-To 加入指南
   ============================================= */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.howto-step {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 22px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  position: relative;
  transition: var(--transition);
}
.howto-step:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.step-num {
  width: 40px;
  height: 40px;
  background: var(--gradient2);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 900;
  margin-bottom: 16px;
}
.howto-step h4 { font-size: 16px; font-weight: 700; color: var(--primary); margin-bottom: 8px; }
.howto-step p { font-size: 13px; color: var(--text-muted); line-height: 1.7; }

/* =============================================
   统计数字
   ============================================= */
.stats-bar {
  background: var(--gradient1);
  padding: 50px 20px;
}
.stats-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}
.stat-item .num {
  font-size: 42px;
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-item .unit { font-size: 20px; }
.stat-item .label { font-size: 14px; color: rgba(255,255,255,0.65); }

/* =============================================
   页脚
   ============================================= */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 20px 30px;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .logo-text .brand { font-size: 24px; color: #fff; }
.footer-brand p {
  font-size: 13px;
  line-height: 1.8;
  margin: 16px 0 24px;
  color: rgba(255,255,255,0.5);
}
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.08);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: var(--transition);
}
.social-btn:hover { background: var(--secondary); }
.footer-col h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 18px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--secondary); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-bottom p { font-size: 13px; color: rgba(255,255,255,0.4); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: 13px; color: rgba(255,255,255,0.4); }
.footer-links a:hover { color: var(--secondary); }
.update-time { font-size: 12px; color: rgba(255,255,255,0.3); }

/* =============================================
   内页通用
   ============================================= */
.page-hero {
  background: var(--gradient1);
  padding: 60px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../images/hero_banner.jpg') center/cover;
  opacity: 0.1;
}
.page-hero-content { position: relative; z-index: 1; }
.page-hero h1 { font-size: clamp(28px, 4vw, 44px); font-weight: 900; color: #fff; margin-bottom: 12px; }
.page-hero p { color: rgba(255,255,255,0.7); font-size: 15px; }

/* =============================================
   标签页
   ============================================= */
.tab-nav {
  display: flex;
  gap: 4px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 32px;
  overflow-x: auto;
}
.tab-btn {
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  white-space: nowrap;
  transition: var(--transition);
}
.tab-btn.active, .tab-btn:hover { color: var(--secondary); border-bottom-color: var(--secondary); }

/* =============================================
   加载更多
   ============================================= */
.load-more-wrap { text-align: center; margin-top: 40px; }
.btn-load-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 2px solid var(--border);
  color: var(--text-muted);
  padding: 12px 32px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-load-more:hover { border-color: var(--secondary); color: var(--secondary); }

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open { display: block; position: absolute; top: 70px; left: 0; right: 0; background: var(--primary); padding: 16px 20px; z-index: 999; }
  .main-nav.open ul { flex-direction: column; gap: 4px; }
  .hamburger { display: flex; }
  .hero-content { grid-template-columns: 1fr; gap: 32px; }
  .hero-visual { display: none; }
  .hero-stats { gap: 20px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .search-tags { display: none; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}

@media (max-width: 480px) {
  .section { padding: 50px 16px; }
  .hero { min-height: 420px; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .stat-item .num { font-size: 30px; }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { text-align: center; justify-content: center; }
}

/* =============================================
   懒加载占位
   ============================================= */
.lazy { opacity: 0; transition: opacity 0.5s ease; }
.lazy.loaded { opacity: 1; }

/* =============================================
   二维码占位SVG样式
   ============================================= */
.qr-placeholder {
  width: 80px;
  height: 80px;
  background: repeating-linear-gradient(
    45deg,
    #ddd,
    #ddd 2px,
    #fff 2px,
    #fff 8px
  );
  border-radius: 4px;
}

/* =============================================
   视频弹窗
   ============================================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.active { display: flex; }
.modal-content {
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  max-width: 900px;
  width: 100%;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #fff;
  cursor: pointer;
  z-index: 1;
  transition: var(--transition);
}
.modal-close:hover { background: var(--secondary); }
.modal-video {
  width: 100%;
  aspect-ratio: 16/9;
  background: #111;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.4);
  font-size: 15px;
}

/* =============================================
   滚动动画
   ============================================= */
.animate-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}