/* ===== b体育传媒 - 主样式文件 ===== */
/* 品牌色彩系统：深红玫瑰+暗金+深紫 */

:root {
  --brand-primary: #C41E3A;
  --brand-secondary: #8B1A1A;
  --brand-gold: #D4A017;
  --brand-dark: #1A0A0F;
  --brand-purple: #2D1B33;
  --brand-light: #FFF5F5;
  --brand-gray: #F8F0F2;
  --text-primary: #1A0A0F;
  --text-secondary: #5A3A42;
  --text-muted: #9A7A82;
  --border-color: #E8D0D5;
  --shadow-sm: 0 2px 8px rgba(196,30,58,0.12);
  --shadow-md: 0 4px 20px rgba(196,30,58,0.18);
  --shadow-lg: 0 8px 40px rgba(196,30,58,0.22);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

/* ===== 重置与基础 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  color: var(--text-primary);
  background: #fff;
  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; }

/* ===== 通用工具类 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 70px 0; }
.section-alt { background: var(--brand-gray); }
.section-dark { background: var(--brand-dark); color: #fff; }
.section-purple { background: var(--brand-purple); color: #fff; }
.text-center { text-align: center; }
.text-gold { color: var(--brand-gold); }
.text-brand { color: var(--brand-primary); }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.hidden { display: none; }

/* ===== 节标题 ===== */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-primary), var(--brand-gold));
  margin-top: 10px;
  border-radius: 2px;
}
.section-title.centered { display: block; text-align: center; }
.section-title.centered::after { margin: 10px auto 0; }
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 600px;
}
.section-subtitle.centered { text-align: center; margin: 0 auto 40px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}
.btn-primary {
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-gold {
  background: linear-gradient(135deg, var(--brand-gold), #B8860B);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline {
  border: 2px solid var(--brand-primary);
  color: var(--brand-primary);
  background: transparent;
}
.btn-outline:hover { background: var(--brand-primary); color: #fff; }
.btn-outline-white {
  border: 2px solid rgba(255,255,255,0.8);
  color: #fff;
  background: transparent;
}
.btn-outline-white:hover { background: rgba(255,255,255,0.15); }

/* ===== 顶部公告条 ===== */
.top-bar {
  background: linear-gradient(90deg, var(--brand-secondary), var(--brand-primary));
  color: #fff;
  font-size: 0.82rem;
  padding: 7px 0;
  text-align: center;
}
.top-bar a { color: var(--brand-gold); font-weight: 600; }

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
}
.navbar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.navbar-logo img { height: 44px; width: auto; }
.navbar-logo .brand-text {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--brand-primary);
  letter-spacing: 2px;
}
.navbar-logo .brand-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  display: block;
  letter-spacing: 1px;
}
.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.navbar-nav a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
}
.navbar-nav a:hover, .navbar-nav a.active {
  color: var(--brand-primary);
  background: var(--brand-light);
}
.navbar-nav a.nav-hot {
  color: var(--brand-primary);
  font-weight: 700;
}

/* 搜索框 */
.navbar-search {
  display: flex;
  align-items: center;
  background: var(--brand-gray);
  border: 1.5px solid var(--border-color);
  border-radius: 24px;
  padding: 6px 16px;
  gap: 8px;
  min-width: 180px;
  transition: var(--transition);
}
.navbar-search:focus-within {
  border-color: var(--brand-primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(196,30,58,0.1);
}
.navbar-search input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 0.88rem;
  color: var(--text-primary);
  width: 100%;
}
.navbar-search input::placeholder { color: var(--text-muted); }
.navbar-search button {
  color: var(--brand-primary);
  font-size: 1rem;
  padding: 0;
  line-height: 1;
}
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  cursor: pointer;
}
.navbar-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  background: var(--brand-gray);
  padding: 10px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--brand-primary); }
.breadcrumb span { margin: 0 6px; }

/* ===== Hero Banner ===== */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--brand-dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.55;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,10,15,0.85) 0%, rgba(45,27,51,0.7) 50%, rgba(196,30,58,0.3) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  color: #fff;
  max-width: 680px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(212,160,23,0.2);
  border: 1px solid var(--brand-gold);
  color: var(--brand-gold);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero h1 em { color: var(--brand-gold); font-style: normal; }
.hero p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 30px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  position: relative;
  z-index: 2;
  display: flex;
  gap: 40px;
  margin-top: 50px;
}
.hero-stat-item { text-align: center; color: #fff; }
.hero-stat-item .num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--brand-gold);
  display: block;
}
.hero-stat-item .label { font-size: 0.82rem; color: rgba(255,255,255,0.7); }

/* ===== 视频卡片 ===== */
.video-card {
  background: #fff;
  border-radius: var(--radius-md);
  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(--brand-dark);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(196,30,58,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(196,30,58,0.5);
  transform: scale(0.8);
  transition: var(--transition);
}
.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: 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--brand-primary);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-info { padding: 14px 16px; }
.video-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-author { display: flex; align-items: center; gap: 8px; margin-top: 10px; }
.video-author img {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  object-fit: cover;
}
.video-author span { font-size: 0.8rem; color: var(--text-secondary); }

/* ===== 专家卡片 ===== */
.expert-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: var(--transition);
  border: 1px solid var(--border-color);
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 14px;
  border: 3px solid var(--brand-primary);
}
.expert-name { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.expert-role {
  font-size: 0.82rem;
  color: var(--brand-primary);
  font-weight: 600;
  margin-bottom: 10px;
}
.expert-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 14px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 14px; }
.award-tag {
  background: var(--brand-light);
  color: var(--brand-primary);
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.expert-btns .btn { padding: 7px 16px; font-size: 0.82rem; }

/* ===== 用户评价 ===== */
.review-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.review-card:hover { box-shadow: var(--shadow-md); }
.review-stars { color: #F5A623; font-size: 1rem; margin-bottom: 10px; }
.review-text { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 14px; }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-gold));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}
.review-name { font-weight: 600; font-size: 0.88rem; }
.review-date { font-size: 0.75rem; color: var(--text-muted); }

/* ===== FAQ ===== */
.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: var(--brand-primary); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  background: #fff;
  transition: var(--transition);
}
.faq-item.open .faq-question { background: var(--brand-light); color: var(--brand-primary); }
.faq-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--brand-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-icon { background: var(--brand-primary); color: #fff; transform: rotate(45deg); }
.faq-answer {
  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-secondary);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 14px 20px 18px; }

/* ===== 合作Logo墙 ===== */
.partner-logos {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 24px;
}
.partner-logo {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px 24px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-secondary);
  transition: var(--transition);
}
.partner-logo:hover { border-color: var(--brand-primary); color: var(--brand-primary); box-shadow: var(--shadow-sm); }

/* ===== 联系我们 ===== */
.contact-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-color);
}
.contact-item:last-child { border-bottom: none; }
.contact-icon {
  width: 40px;
  height: 40px;
  background: var(--brand-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.contact-label { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-weight: 600; font-size: 0.95rem; }

/* ===== 二维码 ===== */
.qrcode-box {
  text-align: center;
  padding: 20px;
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}
.qrcode-box img {
  width: 120px;
  height: 120px;
  margin: 0 auto 10px;
  border: 4px solid var(--brand-light);
  border-radius: var(--radius-sm);
}
.qrcode-box p { font-size: 0.82rem; color: var(--text-secondary); }
.qrcode-box strong { font-size: 0.9rem; color: var(--text-primary); display: block; margin-bottom: 4px; }

/* ===== AI功能卡片 ===== */
.ai-card {
  background: linear-gradient(135deg, var(--brand-purple), #1a0a1f);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  color: #fff;
  border: 1px solid rgba(212,160,23,0.3);
  transition: var(--transition);
}
.ai-card:hover { transform: translateY(-4px); border-color: var(--brand-gold); box-shadow: 0 8px 30px rgba(212,160,23,0.2); }
.ai-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-gold));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}
.ai-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.ai-card p { font-size: 0.85rem; color: rgba(255,255,255,0.75); line-height: 1.7; }

/* ===== 社区功能 ===== */
.community-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.community-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--brand-primary); }
.community-icon {
  font-size: 2.2rem;
  margin-bottom: 12px;
  display: block;
}
.community-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.community-card p { font-size: 0.85rem; color: var(--text-secondary); }

/* ===== 统计数字 ===== */
.stats-bar {
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  padding: 40px 0;
  color: #fff;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat-item { text-align: center; }
.stat-num {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--brand-gold);
  display: block;
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.85); }

/* ===== 分享按钮 ===== */
.share-btns { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 24px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}
.share-wechat { background: #07C160; color: #fff; }
.share-weibo { background: #E6162D; color: #fff; }
.share-douyin { background: #000; color: #fff; }
.share-bilibili { background: #00A1D6; color: #fff; }
.share-btn:hover { opacity: 0.85; transform: translateY(-2px); }

/* ===== 页脚 ===== */
.footer {
  background: var(--brand-dark);
  color: rgba(255,255,255,0.8);
  padding: 60px 0 0;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo-wrap { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand img { height: 40px; filter: brightness(0) invert(1); }
.footer-brand .brand-name { font-size: 1.3rem; font-weight: 800; color: #fff; }
.footer-brand p { font-size: 0.85rem; line-height: 1.8; color: rgba(255,255,255,0.6); margin-bottom: 20px; }
.footer-heading { font-size: 0.95rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 0.85rem; color: rgba(255,255,255,0.6); transition: var(--transition); }
.footer-links a:hover { color: var(--brand-gold); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.footer-bottom p { font-size: 0.8rem; color: rgba(255,255,255,0.45); }
.footer-bottom a { color: rgba(255,255,255,0.55); }
.footer-bottom a:hover { color: var(--brand-gold); }
.update-time { color: var(--brand-gold); font-size: 0.78rem; }

/* ===== 内页页眉 ===== */
.page-header {
  background: linear-gradient(135deg, var(--brand-dark), var(--brand-purple));
  color: #fff;
  padding: 50px 0;
  text-align: center;
}
.page-header h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 10px; }
.page-header p { font-size: 1rem; color: rgba(255,255,255,0.75); }

/* ===== 标签 ===== */
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  margin: 2px;
}
.tag-red { background: var(--brand-light); color: var(--brand-primary); border: 1px solid var(--border-color); }
.tag-gold { background: #FFF8E1; color: #B8860B; border: 1px solid #F0D080; }
.tag-purple { background: #F3E8FF; color: #7B3FA0; border: 1px solid #DDB8FF; }

/* ===== 加载动画 ===== */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .section { padding: 50px 0; }
  .section-title { font-size: 1.6rem; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .navbar-nav { display: none; }
  .navbar-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border-color);
    padding: 10px 20px;
    box-shadow: var(--shadow-md);
  }
  .navbar-toggle { display: flex; }
  .navbar-search { min-width: 120px; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 20px; flex-wrap: wrap; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.6rem; }
  .hero-btns { flex-direction: column; }
  .grid-4 { grid-template-columns: 1fr; }
  .container { padding: 0 14px; }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.6s ease forwards; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: var(--brand-primary); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--brand-secondary); }

/* ===== 选中色 ===== */
::selection { background: rgba(196,30,58,0.2); color: var(--brand-primary); }