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

/* ---- CSS变量 ---- */
:root {
  --primary: #7B2FFF;
  --primary-dark: #5A1FCC;
  --primary-light: #A060FF;
  --accent: #00D4FF;
  --accent2: #FF4E8A;
  --bg-dark: #0A0A18;
  --bg-card: #12122A;
  --bg-card2: #1A1A35;
  --text-main: #E8E8F0;
  --text-muted: #8888AA;
  --text-white: #FFFFFF;
  --border: rgba(123,47,255,0.25);
  --gradient-main: linear-gradient(135deg, #7B2FFF 0%, #00D4FF 100%);
  --gradient-card: linear-gradient(160deg, #12122A 0%, #1A1A35 100%);
  --shadow-glow: 0 0 30px rgba(123,47,255,0.3);
  --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.3s ease;
}

/* ---- 重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-light); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

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

/* ============================================================
   顶部公告栏
   ============================================================ */
.top-bar {
  background: var(--gradient-main);
  padding: 8px 0;
  text-align: center;
  font-size: 13px;
  color: #fff;
  letter-spacing: 0.5px;
}
.top-bar a { color: #fff; font-weight: 600; }

/* ============================================================
   导航栏
   ============================================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10,10,24,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
}
.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 20px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-brand .site-favicon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
}
.nav-brand .site-logo {
  height: 38px;
  width: auto;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.nav-menu a {
  color: var(--text-main);
  font-size: 14px;
  padding: 6px 14px;
  border-radius: 8px;
  transition: all var(--transition);
  white-space: nowrap;
  font-weight: 500;
}
.nav-menu a:hover,
.nav-menu a.active {
  color: var(--accent);
  background: rgba(0,212,255,0.1);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.btn-nav {
  background: var(--gradient-main);
  color: #fff !important;
  padding: 7px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: opacity var(--transition);
}
.btn-nav:hover { opacity: 0.85; color: #fff !important; }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---- 搜索框 ---- */
.search-bar-wrap {
  background: rgba(18,18,42,0.98);
  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-bar-inner input {
  flex: 1;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 9px 20px;
  color: var(--text-main);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition);
}
.search-bar-inner input:focus { border-color: var(--primary); }
.search-bar-inner input::placeholder { color: var(--text-muted); }
.search-bar-inner button {
  background: var(--gradient-main);
  border: none;
  border-radius: 24px;
  padding: 9px 24px;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
  font-weight: 600;
  transition: opacity var(--transition);
}
.search-bar-inner button:hover { opacity: 0.85; }

/* ============================================================
   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(--accent); }
.breadcrumb span { margin: 0 6px; }

/* ============================================================
   Hero / Banner
   ============================================================ */
.hero-banner {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--bg-dark);
}
.hero-banner .hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  opacity: 0.55;
}
.hero-banner .hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(10,10,24,0.92) 0%, rgba(10,10,24,0.5) 60%, rgba(10,10,24,0.2) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 20px;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(123,47,255,0.2);
  border: 1px solid var(--primary);
  border-radius: 20px;
  padding: 5px 14px;
  font-size: 12px;
  color: var(--primary-light);
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content .hero-desc {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-main);
  max-width: 560px;
  margin-bottom: 32px;
  opacity: 0.9;
}
.hero-stats {
  display: flex;
  gap: 32px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}
.hero-stat .num {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.hero-stat .label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  padding: 12px 32px;
  border-radius: 28px;
  font-weight: 700;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(123,47,255,0.5);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--text-main);
  padding: 12px 32px;
  border-radius: 28px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============================================================
   通用布局
   ============================================================ */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.section { padding: 72px 0; }
.section-sm { padding: 48px 0; }
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  background: rgba(123,47,255,0.15);
  border: 1px solid rgba(123,47,255,0.4);
  color: var(--primary-light);
  font-size: 12px;
  padding: 4px 14px;
  border-radius: 12px;
  margin-bottom: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 12px;
}
.section-header h2 span {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-header p {
  color: var(--text-muted);
  font-size: 15px;
  max-width: 560px;
  margin: 0 auto;
}
.divider {
  width: 60px;
  height: 3px;
  background: var(--gradient-main);
  border-radius: 2px;
  margin: 16px auto 0;
}

/* ============================================================
   视频卡片
   ============================================================ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
  border-color: var(--primary);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #0D0D1A;
}
.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(0,0,0,0.3);
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.video-play-btn .play-icon {
  width: 56px;
  height: 56px;
  background: rgba(123,47,255,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  box-shadow: 0 0 24px rgba(123,47,255,0.6);
  transition: transform var(--transition);
}
.video-card:hover .play-icon { transform: scale(1.1); }
.play-icon svg { width: 22px; height: 22px; 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 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 600;
}
.video-info { padding: 16px; }
.video-info h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-white);
  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 .author { display: flex; align-items: center; gap: 5px; }
.video-meta .author img {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  object-fit: cover;
}
.video-stats {
  display: flex;
  gap: 14px;
  margin-top: 10px;
  font-size: 12px;
  color: var(--text-muted);
}
.video-stats span { display: flex; align-items: center; gap: 4px; }

/* ============================================================
   特色模块卡片
   ============================================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
}
.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.feature-icon {
  width: 56px;
  height: 56px;
  background: rgba(123,47,255,0.15);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 26px;
}
.feature-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================================
   专家卡片
   ============================================================ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition);
}
.expert-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  font-size: 32px;
  border: 3px solid var(--primary);
}
.expert-card h3 { font-size: 17px; font-weight: 700; color: var(--text-white); margin-bottom: 4px; }
.expert-card .role { font-size: 13px; color: var(--primary-light); margin-bottom: 10px; }
.expert-card p { font-size: 13px; color: var(--text-muted); margin-bottom: 14px; line-height: 1.6; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 16px; }
.expert-tags span {
  background: rgba(123,47,255,0.15);
  border: 1px solid rgba(123,47,255,0.3);
  color: var(--primary-light);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 10px;
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  padding: 6px 16px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}
.btn-sm-primary { background: var(--gradient-main); color: #fff; }
.btn-sm-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.btn-sm-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ============================================================
   评价卡片
   ============================================================ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition);
}
.review-card:hover { border-color: var(--primary); }
.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;
  font-size: 18px;
  flex-shrink: 0;
}
.review-name { font-weight: 700; font-size: 15px; color: var(--text-white); }
.review-date { font-size: 12px; color: var(--text-muted); }
.review-stars { color: #FFD700; font-size: 14px; margin-bottom: 10px; }
.review-text { font-size: 14px; color: var(--text-main); line-height: 1.7; }
.review-game { margin-top: 10px; font-size: 12px; color: var(--primary-light); }

/* ============================================================
   FAQ
   ============================================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  color: var(--text-white);
  transition: color var(--transition);
  user-select: none;
}
.faq-question:hover { color: var(--accent); }
.faq-question .faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(123,47,255,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 18px; }

/* ============================================================
   社区功能模块
   ============================================================ */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.community-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition);
  cursor: pointer;
}
.community-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 0 20px rgba(0,212,255,0.2);
}
.community-icon { font-size: 36px; margin-bottom: 12px; }
.community-card h3 { font-size: 15px; font-weight: 700; color: var(--text-white); margin-bottom: 6px; }
.community-card p { font-size: 12px; color: var(--text-muted); }
.community-count { font-size: 20px; font-weight: 800; color: var(--accent); margin-top: 8px; }

/* ============================================================
   合作品牌 Logo 墙
   ============================================================ */
.partner-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 24px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
  transition: all var(--transition);
  min-width: 120px;
  text-align: center;
}
.partner-item:hover { border-color: var(--primary); color: var(--primary-light); }

/* ============================================================
   联系我们
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.contact-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: all var(--transition);
}
.contact-card:hover { border-color: var(--primary); }
.contact-card .icon { font-size: 32px; margin-bottom: 14px; }
.contact-card h3 { font-size: 17px; font-weight: 700; color: var(--text-white); margin-bottom: 8px; }
.contact-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }
.contact-card a { color: var(--accent); }
.qr-wrap { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; margin-top: 32px; }
.qr-item { text-align: center; }
.qr-item img { width: 140px; height: 140px; border-radius: var(--radius); border: 2px solid var(--border); object-fit: cover; }
.qr-item p { font-size: 13px; color: var(--text-muted); margin-top: 8px; }

/* ============================================================
   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); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: opacity var(--transition);
}
.share-btn:hover { opacity: 0.85; }
.share-wechat { background: #07C160; color: #fff; }
.share-weibo { background: #E6162D; color: #fff; }
.share-douyin { background: #010101; color: #fff; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; color: #fff; }

/* ============================================================
   页脚
   ============================================================ */
.footer {
  background: #070714;
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand .logo-wrap { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand .logo-wrap img { height: 36px; width: auto; }
.footer-brand p { font-size: 14px; color: var(--text-muted); line-height: 1.8; margin-bottom: 20px; }
.footer-col h4 { font-size: 15px; font-weight: 700; color: var(--text-white); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 13px; color: var(--text-muted); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--accent); }
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.social-btn:hover { border-color: var(--primary); background: rgba(123,47,255,0.15); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: 13px; color: var(--text-muted); }
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--accent); }
.update-time { font-size: 12px; color: var(--text-muted); }

/* ============================================================
   内页 Hero
   ============================================================ */
.page-hero {
  background: linear-gradient(135deg, rgba(123,47,255,0.15) 0%, rgba(0,212,255,0.08) 100%);
  border-bottom: 1px solid var(--border);
  padding: 48px 20px;
  text-align: center;
}
.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.page-hero p { font-size: 15px; color: var(--text-muted); max-width: 600px; margin: 0 auto; }

/* ============================================================
   标签 & 徽章
   ============================================================ */
.tag {
  display: inline-block;
  background: rgba(123,47,255,0.15);
  border: 1px solid rgba(123,47,255,0.3);
  color: var(--primary-light);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 10px;
}
.badge-hot { background: rgba(255,78,138,0.15); border-color: rgba(255,78,138,0.4); color: var(--accent2); }
.badge-new { background: rgba(0,212,255,0.15); border-color: rgba(0,212,255,0.4); color: var(--accent); }

/* ============================================================
   AI赋能模块
   ============================================================ */
.ai-section { background: linear-gradient(135deg, rgba(123,47,255,0.08) 0%, rgba(0,212,255,0.05) 100%); }
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}
.ai-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(123,47,255,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.ai-card:hover { border-color: var(--primary); box-shadow: var(--shadow-glow); }
.ai-card .ai-icon { font-size: 40px; margin-bottom: 16px; }
.ai-card h3 { font-size: 18px; font-weight: 700; color: var(--text-white); margin-bottom: 10px; }
.ai-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }
.ai-card .ai-features { margin-top: 16px; display: flex; flex-direction: column; gap: 6px; }
.ai-card .ai-features li { font-size: 13px; color: var(--text-muted); display: flex; align-items: center; gap: 8px; }
.ai-card .ai-features li::before { content: '✦'; color: var(--primary-light); font-size: 10px; }

/* ============================================================
   统计数字
   ============================================================ */
.stats-bar {
  background: var(--gradient-main);
  padding: 40px 20px;
}
.stats-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-item .num { font-size: 2.5rem; font-weight: 800; color: #fff; line-height: 1; }
.stat-item .label { font-size: 13px; color: rgba(255,255,255,0.8); margin-top: 6px; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-grid { grid-template-columns: 1fr 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-menu { display: none; }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10,10,24,0.98);
    padding: 20px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
  }
  .hamburger { display: flex; }
  .footer-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .hero-banner { min-height: 400px; }
  .hero-stats { gap: 20px; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
  .stats-inner { grid-template-columns: 1fr 1fr; }
}

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

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

/* ============================================================
   视频播放模态框
   ============================================================ */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(6px);
}
.video-modal.open { display: flex; }
.video-modal-inner {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 20px;
  max-width: 800px;
  width: 90%;
  position: relative;
}
.video-modal-close {
  position: absolute;
  top: -14px;
  right: -14px;
  width: 32px;
  height: 32px;
  background: var(--accent2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 18px;
  color: #fff;
  border: none;
  z-index: 1;
}
.video-placeholder {
  aspect-ratio: 16/9;
  background: #000;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 15px;
}