/* =============================================
   无限臀山 - 主样式文件
   品牌色：玫瑰粉 #BF360C | 珊瑚橙 #FF7043 | 深紫 #1a0533
   ============================================= */

/* ---- 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', 'Hiragino Sans GB', sans-serif;
  background: #0d0d1a;
  color: #e8e8f0;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: color .25s; }
a:hover { color: #BF360C; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ---- 颜色变量 ---- */
:root {
  --pink: #BF360C;
  --orange: #FF7043;
  --purple: #1a0533;
  --dark: #0d0d1a;
  --dark2: #12121f;
  --dark3: #1c1c2e;
  --card: #181828;
  --border: rgba(233,30,140,.25);
  --text: #e8e8f0;
  --muted: #9090aa;
  --gradient: linear-gradient(135deg, #BF360C, #FF7043);
  --gradient2: linear-gradient(135deg, #1a0533, #0d1b4b);
}

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

/* ============================================
   顶部公告栏
   ============================================ */
.top-bar {
  background: var(--gradient);
  text-align: center;
  padding: 6px 20px;
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: .5px;
}
.top-bar a { color: #fff; text-decoration: underline; }

/* ============================================
   导航栏
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13,13,26,.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
}
.site-logo .logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.main-nav a {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--text);
  transition: all .25s;
  white-space: nowrap;
}
.main-nav a:hover,
.main-nav a.active {
  background: var(--gradient);
  color: #fff;
  -webkit-text-fill-color: #fff;
}
.header-search {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,.07);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 6px 16px;
  gap: 8px;
  min-width: 200px;
}
.header-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: .88rem;
  width: 100%;
}
.header-search input::placeholder { color: var(--muted); }
.header-search button {
  color: var(--muted);
  font-size: 1rem;
  transition: color .2s;
}
.header-search button:hover { color: var(--pink); }
.nav-actions { display: flex; gap: 10px; flex-shrink: 0; }
.btn-login {
  padding: 7px 18px;
  border-radius: 20px;
  border: 1px solid var(--pink);
  color: var(--pink);
  font-size: .88rem;
  font-weight: 600;
  transition: all .25s;
}
.btn-login:hover { background: var(--pink); color: #fff; }
.btn-join {
  padding: 7px 18px;
  border-radius: 20px;
  background: var(--gradient);
  color: #fff;
  font-size: .88rem;
  font-weight: 600;
  transition: opacity .25s;
}
.btn-join:hover { opacity: .85; }
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: .3s; }

/* 搜索框下方 */
.search-bar-row {
  background: var(--dark2);
  border-bottom: 1px solid rgba(255,255,255,.05);
  padding: 10px 20px;
}
.search-bar-row .search-inner {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  background: rgba(255,255,255,.05);
  border: 1px solid var(--border);
  border-radius: 30px;
  padding: 8px 20px;
  gap: 10px;
}
.search-bar-row input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: .95rem;
}
.search-bar-row input::placeholder { color: var(--muted); }
.search-bar-row .search-btn {
  background: var(--gradient);
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 6px 20px;
  font-size: .88rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .2s;
}
.search-bar-row .search-btn:hover { opacity: .85; }

/* ============================================
   Hero 首屏
   ============================================ */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero_banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(.45);
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(13,13,26,.9) 40%, transparent);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 20px;
  max-width: 620px;
}
.hero-tag {
  display: inline-block;
  background: var(--gradient);
  color: #fff;
  font-size: .78rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 16px;
  color: #fff;
}
.hero h1 span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  color: rgba(255,255,255,.75);
  font-size: 1rem;
  margin-bottom: 28px;
  line-height: 1.7;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--gradient);
  color: #fff;
  border-radius: 30px;
  font-weight: 700;
  font-size: .95rem;
  transition: transform .2s, box-shadow .2s;
  box-shadow: 0 4px 20px rgba(233,30,140,.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(233,30,140,.5); color: #fff; }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: 2px solid rgba(255,255,255,.4);
  color: #fff;
  border-radius: 30px;
  font-weight: 600;
  font-size: .95rem;
  transition: all .2s;
}
.btn-outline:hover { border-color: var(--pink); color: var(--pink); }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 36px;
  flex-wrap: wrap;
}
.hero-stats .stat { text-align: center; }
.hero-stats .stat .num {
  font-size: 1.6rem;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stats .stat .label { font-size: .78rem; color: var(--muted); margin-top: 2px; }

/* ============================================
   通用区块
   ============================================ */
.section { padding: 64px 20px; }
.section-alt { background: var(--dark2); }
.container { max-width: 1280px; margin: 0 auto; }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head .label {
  display: inline-block;
  background: rgba(233,30,140,.15);
  color: var(--pink);
  border: 1px solid rgba(233,30,140,.3);
  font-size: .78rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 12px;
  letter-spacing: 1px;
}
.section-head h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}
.section-head h2 span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-head p { color: var(--muted); font-size: .95rem; max-width: 560px; margin: 0 auto; }
.section-more { text-align: center; margin-top: 36px; }
.btn-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 28px;
  border: 1px solid var(--border);
  color: var(--pink);
  border-radius: 24px;
  font-size: .9rem;
  font-weight: 600;
  transition: all .25s;
}
.btn-more:hover { background: var(--pink); color: #fff; border-color: var(--pink); }

/* ============================================
   视频卡片
   ============================================ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.video-card {
  background: var(--card);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.06);
  transition: transform .25s, box-shadow .25s;
  cursor: pointer;
}
.video-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(233,30,140,.2); }
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #111;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,.35);
  opacity: 0;
  transition: opacity .25s;
}
.video-card:hover .play-btn { opacity: 1; }
.play-btn svg {
  width: 52px;
  height: 52px;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,.5));
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,.7);
  color: #fff;
  font-size: .72rem;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}
.video-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--gradient);
  color: #fff;
  font-size: .68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: .5px;
}
.video-info { padding: 14px; }
.video-info h3 {
  font-size: .92rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: .78rem;
  color: var(--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;
  background: var(--gradient);
}
.video-stats { display: flex; gap: 12px; margin-top: 8px; font-size: .75rem; color: var(--muted); }
.video-stats span { display: flex; align-items: center; gap: 4px; }

/* ============================================
   分类标签栏
   ============================================ */
.category-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.cat-tab {
  padding: 6px 18px;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,.12);
  color: var(--muted);
  font-size: .85rem;
  cursor: pointer;
  transition: all .2s;
}
.cat-tab:hover, .cat-tab.active {
  background: var(--gradient);
  border-color: transparent;
  color: #fff;
}

/* ============================================
   专家卡片
   ============================================ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.expert-card {
  background: var(--card);
  border-radius: 14px;
  padding: 24px 20px;
  text-align: center;
  border: 1px solid rgba(255,255,255,.06);
  transition: transform .25s, box-shadow .25s;
}
.expert-card:hover { transform: translateY(-4px); box-shadow: 0 10px 28px rgba(233,30,140,.18); }
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  border: 3px solid rgba(233,30,140,.4);
}
.expert-card h3 { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 4px; }
.expert-card .role { font-size: .8rem; color: var(--pink); margin-bottom: 8px; font-weight: 600; }
.expert-card .desc { font-size: .82rem; color: var(--muted); line-height: 1.6; margin-bottom: 14px; }
.expert-tags { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; margin-bottom: 14px; }
.expert-tags span {
  background: rgba(233,30,140,.12);
  color: var(--pink);
  font-size: .72rem;
  padding: 2px 8px;
  border-radius: 10px;
  border: 1px solid rgba(233,30,140,.2);
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.expert-btns a {
  padding: 6px 14px;
  border-radius: 16px;
  font-size: .78rem;
  font-weight: 600;
  transition: all .2s;
}
.expert-btns .btn-contact { background: var(--gradient); color: #fff; }
.expert-btns .btn-works { border: 1px solid var(--border); color: var(--pink); }
.expert-btns .btn-works:hover { background: rgba(233,30,140,.1); }

/* ============================================
   功能模块卡片
   ============================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.feature-card {
  background: var(--card);
  border-radius: 14px;
  padding: 24px 20px;
  border: 1px solid rgba(255,255,255,.06);
  transition: all .25s;
  text-align: center;
}
.feature-card:hover { border-color: var(--pink); background: rgba(233,30,140,.06); transform: translateY(-3px); }
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: rgba(233,30,140,.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  font-size: 1.5rem;
  transition: background .25s;
}
.feature-card:hover .feature-icon { background: var(--gradient); }
.feature-card h3 { font-size: .92rem; font-weight: 700; color: #fff; margin-bottom: 6px; }
.feature-card p { font-size: .8rem; color: var(--muted); line-height: 1.6; }

/* ============================================
   合作品牌
   ============================================ */
.partner-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}
.partner-item {
  background: var(--card);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 10px;
  padding: 14px 24px;
  font-size: .88rem;
  font-weight: 600;
  color: var(--muted);
  transition: all .25s;
  min-width: 120px;
  text-align: center;
}
.partner-item:hover { border-color: var(--pink); color: var(--pink); }

/* ============================================
   FAQ
   ============================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--card);
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.06);
  margin-bottom: 10px;
  overflow: hidden;
}
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 600;
  color: #fff;
  font-size: .92rem;
  transition: color .2s;
}
.faq-q:hover { color: var(--pink); }
.faq-q .icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(233,30,140,.15);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: .9rem;
  color: var(--pink);
  transition: transform .3s;
}
.faq-item.open .faq-q .icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, padding .35s;
  padding: 0 20px;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 20px 16px; }

/* ============================================
   用户评价
   ============================================ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--card);
  border-radius: 14px;
  padding: 22px;
  border: 1px solid rgba(255,255,255,.06);
  transition: transform .25s;
}
.review-card:hover { 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);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: #fff;
  flex-shrink: 0;
}
.review-info .name { font-weight: 700; color: #fff; font-size: .9rem; }
.review-info .date { font-size: .75rem; color: var(--muted); }
.review-stars { color: #FFB800; font-size: .88rem; margin-bottom: 10px; }
.review-text { font-size: .85rem; color: var(--muted); line-height: 1.7; }
.review-tag {
  display: inline-block;
  margin-top: 10px;
  background: rgba(233,30,140,.1);
  color: var(--pink);
  font-size: .72rem;
  padding: 2px 8px;
  border-radius: 10px;
}

/* ============================================
   联系我们
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.contact-info h3 { font-size: 1.2rem; font-weight: 800; color: #fff; margin-bottom: 20px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}
.contact-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(233,30,140,.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
  color: var(--pink);
}
.contact-item .label { font-size: .78rem; color: var(--muted); margin-bottom: 2px; }
.contact-item .value { font-size: .9rem; color: #fff; font-weight: 600; }
.qr-group { display: flex; gap: 20px; flex-wrap: wrap; }
.qr-box { text-align: center; }
.qr-box img { width: 120px; height: 120px; border-radius: 10px; border: 2px solid var(--border); }
.qr-box p { font-size: .78rem; color: var(--muted); margin-top: 8px; }

/* ============================================
   How-To 加入
   ============================================ */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  counter-reset: step;
}
.step-card {
  background: var(--card);
  border-radius: 14px;
  padding: 24px 20px;
  border: 1px solid rgba(255,255,255,.06);
  position: relative;
  text-align: center;
}
.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-weight: 900;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
}
.step-card h3 { font-size: .92rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
.step-card p { font-size: .8rem; color: var(--muted); line-height: 1.6; }

/* ============================================
   社交分享
   ============================================ */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  padding: 24px 20px;
  background: var(--dark2);
  border-top: 1px solid rgba(255,255,255,.05);
  border-bottom: 1px solid rgba(255,255,255,.05);
}
.share-bar span { font-size: .88rem; color: var(--muted); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: .82rem;
  font-weight: 600;
  transition: opacity .2s;
  color: #fff;
}
.share-btn:hover { opacity: .85; color: #fff; }
.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #000; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; }

/* ============================================
   底部 Footer
   ============================================ */
.site-footer {
  background: var(--dark2);
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 48px 20px 24px;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}
.footer-brand .logo-text {
  font-size: 1.3rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.footer-brand p { font-size: .85rem; color: var(--muted); line-height: 1.7; max-width: 280px; }
.footer-social { display: flex; gap: 10px; margin-top: 16px; }
.footer-social a {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: rgba(255,255,255,.06);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
  transition: background .2s;
}
.footer-social a:hover { background: var(--pink); }
.footer-col h4 { font-size: .88rem; font-weight: 700; color: #fff; margin-bottom: 14px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: .82rem; color: var(--muted); transition: color .2s; }
.footer-col ul li a:hover { color: var(--pink); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.06);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: .8rem; color: var(--muted); }
.footer-links { display: flex; gap: 16px; }
.footer-links a { font-size: .78rem; color: var(--muted); transition: color .2s; }
.footer-links a:hover { color: var(--pink); }

/* ============================================
   面包屑
   ============================================ */
.breadcrumb {
  padding: 12px 20px;
  background: var(--dark2);
  border-bottom: 1px solid rgba(255,255,255,.05);
}
.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .82rem;
  color: var(--muted);
}
.breadcrumb-inner a { color: var(--muted); transition: color .2s; }
.breadcrumb-inner a:hover { color: var(--pink); }
.breadcrumb-inner .sep { color: rgba(255,255,255,.2); }
.breadcrumb-inner .current { color: var(--pink); }

/* ============================================
   内页 Banner
   ============================================ */
.page-banner {
  padding: 48px 20px;
  background: var(--gradient2);
  border-bottom: 1px solid rgba(255,255,255,.06);
  text-align: center;
}
.page-banner h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 900;
  color: #fff;
  margin-bottom: 10px;
}
.page-banner h1 span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-banner p { color: var(--muted); font-size: .95rem; }

/* ============================================
   直播卡片
   ============================================ */
.live-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.live-card {
  background: var(--card);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.06);
  transition: transform .25s;
}
.live-card:hover { transform: translateY(-4px); }
.live-thumb {
  position: relative;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, #1a0533, #0d1b4b);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}
.live-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: #BF360C;
  color: #fff;
  font-size: .7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.live-badge::before { content: ''; width: 6px; height: 6px; background: #fff; border-radius: 50%; animation: blink 1s infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }
.live-viewers {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,.65);
  color: #fff;
  font-size: .72rem;
  padding: 2px 8px;
  border-radius: 4px;
}
.live-info { padding: 12px 14px; }
.live-info h3 { font-size: .88rem; font-weight: 700; color: #fff; margin-bottom: 6px; }
.live-info .host { font-size: .78rem; color: var(--muted); }

/* ============================================
   AI 功能卡片
   ============================================ */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.ai-card {
  background: linear-gradient(135deg, rgba(233,30,140,.08), rgba(255,107,53,.05));
  border-radius: 16px;
  padding: 28px 24px;
  border: 1px solid rgba(233,30,140,.2);
  transition: all .25s;
}
.ai-card:hover { border-color: var(--pink); transform: translateY(-3px); }
.ai-card .icon { font-size: 2rem; margin-bottom: 14px; }
.ai-card h3 { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
.ai-card p { font-size: .85rem; color: var(--muted); line-height: 1.7; }
.ai-card .tag {
  display: inline-block;
  margin-top: 12px;
  background: var(--gradient);
  color: #fff;
  font-size: .72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 10px;
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(13,13,26,.98);
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
  }
  .hamburger { display: flex; }
  .header-search { display: none; }
  .nav-actions .btn-login { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero { min-height: 400px; }
  .hero-stats { gap: 20px; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-btns { flex-direction: column; }
  .video-grid { grid-template-columns: 1fr 1fr; }
  .expert-grid { grid-template-columns: 1fr 1fr; }
  .howto-steps { grid-template-columns: 1fr 1fr; }
}

/* ============================================
   动画
   ============================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp .5s ease forwards; }

/* ============================================
   视频播放模态框
   ============================================ */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.85);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal-box {
  background: var(--card);
  border-radius: 16px;
  padding: 20px;
  max-width: 720px;
  width: 90%;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 14px;
  font-size: 1.4rem;
  color: var(--muted);
  cursor: pointer;
  transition: color .2s;
}
.modal-close:hover { color: var(--pink); }
.modal-video {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--muted);
}

/* ============================================
   滚动动画
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ============================================
   视频卡片补充（video-desc / video-tags / avatar-dot）
   ============================================ */
.video-desc {
  font-size: .8rem;
  color: var(--muted);
  margin: 4px 0 6px;
  line-height: 1.5;
}
.video-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 8px;
}
.video-tags span {
  background: rgba(233,30,140,.12);
  color: var(--pink);
  border-radius: 20px;
  padding: 2px 8px;
  font-size: .72rem;
  border: 1px solid rgba(233,30,140,.25);
}
.avatar-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: inline-block;
  vertical-align: middle;
  margin-right: 4px;
}
/* ============================================
   娱乐专区（entertain-grid / entertain-card）
   ============================================ */
.entertain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 32px;
}
.entertain-card {
  background: var(--card);
  border-radius: 16px;
  padding: 24px;
  border: 1px solid rgba(255,255,255,.06);
  transition: transform .3s, box-shadow .3s;
}
.entertain-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(233,30,140,.15);
}
.entertain-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.entertain-header h3 {
  font-size: 1rem;
  color: #fff;
  margin: 0;
  flex: 1;
}
.entertain-icon { font-size: 1.4rem; }
.entertain-badge {
  background: linear-gradient(135deg, #BF360C, #7B2FBE);
  color: #fff;
  border-radius: 20px;
  padding: 2px 10px;
  font-size: .72rem;
  white-space: nowrap;
}
.entertain-card p {
  font-size: .85rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 12px;
}
.entertain-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 14px;
}
.entertain-tags span {
  background: rgba(123,47,190,.15);
  color: #b57bee;
  border-radius: 20px;
  padding: 2px 8px;
  font-size: .72rem;
  border: 1px solid rgba(123,47,190,.25);
}
.tiktok-card { border-color: rgba(233,30,140,.25); }
.feature-link {
  color: var(--pink);
  font-size: .85rem;
  text-decoration: none;
  font-weight: 600;
}
.feature-link:hover { text-decoration: underline; }
/* ============================================
   社区功能JSON展示块
   ============================================ */
.community-json-block {
  background: #0a0a14;
  border: 1px solid rgba(233,30,140,.3);
  border-radius: 14px;
  padding: 20px 24px;
  margin: 28px 0 0;
  overflow-x: auto;
}
.json-label {
  font-size: .78rem;
  color: var(--pink);
  font-weight: 700;
  letter-spacing: .05em;
  margin-bottom: 10px;
  text-transform: uppercase;
}
.community-json {
  margin: 0;
  font-family: 'Courier New', Courier, monospace;
  font-size: .78rem;
  color: #a8d8a8;
  line-height: 1.7;
  white-space: pre;
  overflow-x: auto;
}
.community-json code { color: inherit; background: none; }
@media (max-width: 768px) {
  .entertain-grid { grid-template-columns: 1fr; }
  .community-json { font-size: .7rem; }
}