/* =====================================================
   糖心vlog - 主样式文件
   品牌色：深玫瑰粉 #E8336D / 珊瑚橙 #FF6B35 / 深夜蓝 #0D1B2A
   ===================================================== */

/* ---- 基础重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: #0a0e1a;
  color: #e8eaf0;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: color .25s; }
a:hover { color: #E8336D; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ---- CSS变量 ---- */
:root {
  --brand:       #E8336D;
  --brand-light: #ff6b9d;
  --brand-dark:  #b01f50;
  --accent:      #FF6B35;
  --accent2:     #ffd166;
  --bg-dark:     #0a0e1a;
  --bg-card:     #131929;
  --bg-card2:    #1a2236;
  --border:      rgba(232,51,109,.25);
  --text-main:   #e8eaf0;
  --text-muted:  #8892a4;
  --text-light:  #c0c8d8;
  --radius:      12px;
  --radius-lg:   20px;
  --shadow:      0 8px 32px rgba(0,0,0,.45);
  --glow:        0 0 24px rgba(232,51,109,.35);
}

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

/* ---- 通用工具类 ---- */
.container { max-width: 1240px; margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.section-sm { padding: 48px 0; }
.text-center { text-align: center; }
.text-brand { color: var(--brand); }
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.hidden { display: none !important; }

/* ---- 标题组件 ---- */
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  letter-spacing: .02em;
}
.section-title span { color: var(--brand); }
.section-subtitle {
  font-size: .95rem;
  color: var(--text-muted);
  margin-bottom: 40px;
}
.section-header { margin-bottom: 40px; }
.section-header .divider {
  width: 56px; height: 3px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  border-radius: 2px;
  margin: 12px 0 0;
}
.section-header.center { text-align: center; }
.section-header.center .divider { margin: 12px auto 0; }

/* ---- 按钮 ---- */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 24px;
  border-radius: 50px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all .25s;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #fff;
  box-shadow: 0 4px 16px rgba(232,51,109,.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(232,51,109,.55);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--brand);
  border: 1.5px solid var(--brand);
}
.btn-outline:hover {
  background: var(--brand);
  color: #fff;
}
.btn-ghost {
  background: rgba(255,255,255,.07);
  color: var(--text-main);
  border: 1px solid rgba(255,255,255,.12);
}
.btn-ghost:hover {
  background: rgba(232,51,109,.15);
  border-color: var(--brand);
  color: var(--brand);
}
.btn-sm { padding: 7px 16px; font-size: .82rem; }
.btn-lg { padding: 14px 36px; font-size: 1rem; }

/* ---- 徽章 ---- */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 50px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .04em;
}
.badge-brand { background: rgba(232,51,109,.18); color: var(--brand); }
.badge-accent { background: rgba(255,107,53,.18); color: var(--accent); }
.badge-gold { background: rgba(255,209,102,.15); color: var(--accent2); }
.badge-new { background: var(--brand); color: #fff; }

/* =====================================================
   顶部导航
   ===================================================== */
#site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10,14,26,.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(232,51,109,.15);
  transition: all .3s;
}
#site-header.scrolled {
  background: rgba(10,14,26,.98);
  box-shadow: 0 4px 24px rgba(0,0,0,.5);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
  gap: 20px;
}
/* Logo */
.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: 1.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: .02em;
}
/* 主导航 */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: .9rem;
  color: var(--text-light);
  transition: all .2s;
  white-space: nowrap;
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--brand);
  background: rgba(232,51,109,.1);
}
/* 搜索框 */
.header-search {
  display: flex; align-items: center;
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 50px;
  padding: 6px 16px;
  gap: 8px;
  flex: 0 1 260px;
  transition: all .25s;
}
.header-search:focus-within {
  border-color: var(--brand);
  background: rgba(232,51,109,.08);
  box-shadow: 0 0 0 3px rgba(232,51,109,.15);
}
.header-search input {
  background: none; border: none; outline: none;
  color: var(--text-main);
  font-size: .88rem;
  width: 100%;
}
.header-search input::placeholder { color: var(--text-muted); }
.header-search .search-icon { color: var(--text-muted); font-size: 1rem; cursor: pointer; }
.header-search .search-icon:hover { color: var(--brand); }
/* 汉堡菜单 */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all .3s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- 搜索栏（导航下方） ---- */
.search-bar-row {
  background: rgba(19,25,41,.95);
  border-bottom: 1px solid rgba(255,255,255,.06);
  padding: 10px 0;
}
.search-bar-inner {
  display: flex; align-items: center; gap: 12px;
  max-width: 1240px; margin: 0 auto; padding: 0 20px;
}
.search-bar-inner .search-label {
  font-size: .82rem; color: var(--text-muted); white-space: nowrap;
}
.search-bar-full {
  display: flex; align-items: center;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 8px;
  padding: 8px 16px;
  gap: 10px;
  flex: 1;
  max-width: 680px;
}
.search-bar-full input {
  background: none; border: none; outline: none;
  color: var(--text-main); font-size: .92rem; width: 100%;
}
.search-bar-full input::placeholder { color: var(--text-muted); }
.search-bar-full .btn-search {
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #fff; border: none; border-radius: 6px;
  padding: 5px 16px; font-size: .85rem; cursor: pointer;
  white-space: nowrap; transition: opacity .2s;
}
.search-bar-full .btn-search:hover { opacity: .85; }
.search-hot-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-hot-tags a {
  font-size: .78rem; color: var(--text-muted);
  background: rgba(255,255,255,.05);
  padding: 3px 10px; border-radius: 50px;
  border: 1px solid rgba(255,255,255,.08);
  transition: all .2s;
}
.search-hot-tags a:hover { color: var(--brand); border-color: var(--brand); background: rgba(232,51,109,.08); }

/* =====================================================
   Hero Banner
   ===================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden;
  padding-top: 100px;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background: linear-gradient(135deg, #0a0e1a 0%, #1a0a2e 50%, #0d1b2a 100%);
}
.hero-bg img {
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: .18;
}
.hero-bg::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(10,14,26,.3) 0%, rgba(10,14,26,.85) 100%);
}
.hero-particles {
  position: absolute; inset: 0; z-index: 1;
  pointer-events: none;
  overflow: hidden;
}
.hero-particles span {
  position: absolute;
  width: 3px; height: 3px;
  border-radius: 50%;
  background: var(--brand);
  animation: float-particle 6s infinite ease-in-out;
  opacity: .6;
}
@keyframes float-particle {
  0%,100% { transform: translateY(0) scale(1); opacity: .6; }
  50% { transform: translateY(-30px) scale(1.4); opacity: 1; }
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 1240px; margin: 0 auto; padding: 0 20px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.hero-text .eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .82rem; font-weight: 600; letter-spacing: .1em;
  color: var(--brand); text-transform: uppercase;
  margin-bottom: 20px;
}
.hero-text .eyebrow::before {
  content: ''; width: 24px; height: 2px;
  background: var(--brand); border-radius: 1px;
}
.hero-text h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 900;
  line-height: 1.15;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: -.01em;
}
.hero-text h1 .highlight {
  background: linear-gradient(135deg, var(--brand), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-text .hero-desc {
  font-size: 1rem; color: var(--text-light);
  line-height: 1.8; margin-bottom: 32px;
  max-width: 480px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats {
  display: flex; gap: 32px; flex-wrap: wrap;
}
.hero-stat .num {
  font-size: 1.8rem; font-weight: 800;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.hero-stat .label { font-size: .8rem; color: var(--text-muted); margin-top: 4px; }
/* 右侧视频卡片展示 */
.hero-visual { position: relative; }
.hero-video-stack {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.hero-video-stack .vcard-main {
  grid-column: 1 / -1;
}
/* 浮动标签 */
.hero-float-tag {
  position: absolute;
  background: rgba(19,25,41,.9);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(232,51,109,.3);
  border-radius: 12px;
  padding: 10px 16px;
  font-size: .82rem;
  z-index: 10;
  white-space: nowrap;
}
.hero-float-tag.tag-live {
  top: -16px; right: -16px;
  color: #fff;
}
.hero-float-tag.tag-live .dot {
  display: inline-block; width: 8px; height: 8px;
  background: #ff4444; border-radius: 50%;
  margin-right: 6px;
  animation: blink 1.2s infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.3} }
.hero-float-tag.tag-ai {
  bottom: -16px; left: -16px;
  color: var(--accent2);
}

/* =====================================================
   视频卡片
   ===================================================== */
.video-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
  cursor: pointer;
  transition: transform .3s, box-shadow .3s;
  border: 1px solid rgba(255,255,255,.06);
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow), var(--glow);
}
.video-card .thumb-wrap {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}
.video-card.vertical .thumb-wrap { aspect-ratio: 9/16; }
.video-card .thumb-wrap img,
.video-card .thumb-wrap video {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .4s;
}
.video-card:hover .thumb-wrap img { transform: scale(1.06); }
.video-card .play-overlay {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,.35);
  opacity: 0;
  transition: opacity .3s;
}
.video-card:hover .play-overlay { opacity: 1; }
.video-card .play-btn {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: rgba(232,51,109,.9);
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
  box-shadow: 0 4px 16px rgba(232,51,109,.5);
  transition: transform .2s;
}
.video-card:hover .play-btn { transform: scale(1.1); }
.play-btn svg { width: 20px; height: 20px; fill: #fff; margin-left: 3px; }
.video-card .vcard-meta {
  padding: 12px 14px;
}
.video-card .vcard-title {
  font-size: .9rem; font-weight: 600; color: #fff;
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-card .vcard-info {
  display: flex; align-items: center; gap: 12px;
  font-size: .78rem; color: var(--text-muted);
}
.video-card .vcard-info span { display: flex; align-items: center; gap: 4px; }
.video-card .vcard-tag {
  position: absolute; top: 10px; left: 10px;
}
.video-card .duration {
  position: absolute; bottom: 10px; right: 10px;
  background: rgba(0,0,0,.75);
  color: #fff; font-size: .72rem;
  padding: 2px 7px; border-radius: 4px;
}
/* 视频网格 */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.video-grid-3 { grid-template-columns: repeat(3, 1fr); }
.video-grid-5 { grid-template-columns: repeat(5, 1fr); }

/* =====================================================
   分类标签栏
   ===================================================== */
.cat-tabs {
  display: flex; gap: 8px; flex-wrap: wrap;
  margin-bottom: 28px;
}
.cat-tab {
  padding: 7px 18px;
  border-radius: 50px;
  font-size: .85rem;
  cursor: pointer;
  border: 1.5px solid rgba(255,255,255,.1);
  color: var(--text-muted);
  background: rgba(255,255,255,.04);
  transition: all .2s;
}
.cat-tab:hover,
.cat-tab.active {
  border-color: var(--brand);
  color: var(--brand);
  background: rgba(232,51,109,.1);
}

/* =====================================================
   专家卡片
   ===================================================== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.07);
  transition: transform .3s, box-shadow .3s;
}
.expert-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}
.expert-card .expert-img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  object-position: top;
}
.expert-card .expert-body { padding: 16px; }
.expert-card .expert-name {
  font-size: 1rem; font-weight: 700; color: #fff;
  margin-bottom: 4px;
}
.expert-card .expert-role {
  font-size: .8rem; color: var(--brand);
  margin-bottom: 8px;
}
.expert-card .expert-desc {
  font-size: .82rem; color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}
.expert-card .expert-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.expert-card .expert-tag {
  font-size: .72rem; padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255,255,255,.07);
  color: var(--text-muted);
}
.expert-card .expert-actions { display: flex; gap: 8px; }

/* =====================================================
   AI赋能模块
   ===================================================== */
.ai-section { background: linear-gradient(135deg, #0d1b2a 0%, #1a0a2e 100%); }
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-card {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(232,51,109,.2);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: all .3s;
  position: relative;
  overflow: hidden;
}
.ai-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  transform: scaleX(0);
  transition: transform .3s;
}
.ai-card:hover::before { transform: scaleX(1); }
.ai-card:hover {
  background: rgba(232,51,109,.07);
  box-shadow: var(--glow);
  transform: translateY(-4px);
}
.ai-card .ai-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
  box-shadow: 0 4px 16px rgba(232,51,109,.35);
}
.ai-card h3 { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
.ai-card p { font-size: .85rem; color: var(--text-muted); line-height: 1.7; }

/* =====================================================
   社区功能
   ===================================================== */
.community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.community-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid rgba(255,255,255,.06);
  transition: all .3s;
  display: flex; flex-direction: column; gap: 12px;
}
.community-card:hover {
  border-color: rgba(232,51,109,.35);
  background: var(--bg-card2);
  transform: translateY(-3px);
}
.community-card .cc-icon {
  font-size: 2rem; line-height: 1;
}
.community-card h3 { font-size: .95rem; font-weight: 700; color: #fff; }
.community-card p { font-size: .83rem; color: var(--text-muted); line-height: 1.65; }
.community-card .cc-stats {
  display: flex; gap: 16px;
  font-size: .78rem; color: var(--text-muted);
  padding-top: 8px;
  border-top: 1px solid rgba(255,255,255,.06);
}
.community-card .cc-stats strong { color: var(--brand); }

/* =====================================================
   用户评价
   ===================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid rgba(255,255,255,.06);
  transition: transform .3s;
}
.review-card:hover { transform: translateY(-3px); }
.review-card .stars { color: var(--accent2); font-size: .9rem; margin-bottom: 10px; }
.review-card .review-text {
  font-size: .85rem; color: var(--text-light);
  line-height: 1.7; margin-bottom: 14px;
}
.review-card .reviewer {
  display: flex; align-items: center; gap: 10px;
}
.review-card .reviewer-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: .9rem; color: #fff; font-weight: 700;
  flex-shrink: 0;
}
.review-card .reviewer-name { font-size: .85rem; font-weight: 600; color: #fff; }
.review-card .reviewer-date { font-size: .75rem; color: var(--text-muted); }

/* =====================================================
   FAQ
   ===================================================== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  margin-bottom: 10px;
  border: 1px solid rgba(255,255,255,.06);
  overflow: hidden;
  transition: border-color .2s;
}
.faq-item.open { border-color: rgba(232,51,109,.3); }
.faq-q {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 20px;
  cursor: pointer;
  font-size: .95rem; font-weight: 600; color: #fff;
  gap: 12px;
}
.faq-q .faq-icon {
  width: 24px; height: 24px; flex-shrink: 0;
  border-radius: 50%;
  border: 1.5px solid rgba(232,51,109,.4);
  display: flex; align-items: center; justify-content: center;
  color: var(--brand); font-size: 1.1rem;
  transition: transform .3s;
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--brand); color: #fff; border-color: var(--brand); }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height .35s ease, padding .35s;
  padding: 0 20px;
  font-size: .88rem; color: var(--text-muted); line-height: 1.75;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 20px 18px; }

/* =====================================================
   合作品牌墙
   ===================================================== */
.partner-wall {
  display: flex; flex-wrap: wrap; gap: 16px;
  justify-content: center;
}
.partner-item {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,.07);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: .9rem; font-weight: 600;
  color: var(--text-muted);
  transition: all .25s;
  cursor: default;
}
.partner-item:hover {
  border-color: rgba(232,51,109,.35);
  color: var(--brand);
  background: rgba(232,51,109,.06);
}

/* =====================================================
   社交分享
   ===================================================== */
.share-bar {
  display: flex; gap: 12px; flex-wrap: wrap;
  justify-content: center;
}
.share-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 20px;
  border-radius: 50px;
  font-size: .85rem; font-weight: 600;
  cursor: pointer; border: none;
  transition: all .25s;
  color: #fff;
}
.share-btn.wechat { background: #07C160; }
.share-btn.weibo { background: #E6162D; }
.share-btn.douyin { background: #010101; border: 1px solid #333; }
.share-btn.bilibili { background: #00A1D6; }
.share-btn:hover { transform: translateY(-2px); filter: brightness(1.1); }

/* =====================================================
   联系我们
   ===================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.contact-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  border: 1px solid rgba(255,255,255,.07);
  text-align: center;
}
.contact-card .contact-icon {
  font-size: 2.4rem; margin-bottom: 14px;
}
.contact-card h3 { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
.contact-card p { font-size: .85rem; color: var(--text-muted); line-height: 1.7; }
.contact-card .contact-val {
  font-size: .9rem; color: var(--brand); font-weight: 600; margin-top: 8px;
}
/* QR码 */
.qr-group { display: flex; gap: 32px; justify-content: center; flex-wrap: wrap; }
.qr-item { text-align: center; }
.qr-item img {
  width: 120px; height: 120px;
  border-radius: 12px;
  border: 2px solid rgba(232,51,109,.3);
  margin: 0 auto 8px;
}
.qr-item span { font-size: .8rem; color: var(--text-muted); }

/* =====================================================
   页脚
   ===================================================== */
#site-footer {
  background: #070a14;
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 56px 0 24px;
}
.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: 14px;
}
.footer-brand .logo-wrap img { width: 40px; height: 40px; border-radius: 8px; }
.footer-brand .logo-wrap span {
  font-size: 1.2rem; font-weight: 800;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-brand p { font-size: .85rem; color: var(--text-muted); line-height: 1.75; margin-bottom: 16px; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.1);
  display: flex; align-items: center; justify-content: center;
  font-size: .9rem; color: var(--text-muted);
  transition: all .2s;
}
.footer-social a:hover { background: var(--brand); border-color: var(--brand); color: #fff; }
.footer-col h4 {
  font-size: .9rem; font-weight: 700; color: #fff;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,.07);
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: .85rem; color: var(--text-muted); transition: color .2s; }
.footer-col ul li a:hover { color: var(--brand); }
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,.06);
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
  font-size: .8rem; color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--brand); }
.footer-update { color: var(--brand); font-weight: 600; }

/* =====================================================
   面包屑
   ===================================================== */
.breadcrumb {
  display: flex; align-items: center; gap: 6px;
  font-size: .82rem; color: var(--text-muted);
  padding: 12px 0;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--brand); }
.breadcrumb .sep { color: rgba(255,255,255,.2); }
.breadcrumb .current { color: var(--brand); }

/* =====================================================
   内页通用
   ===================================================== */
.page-hero {
  padding: 120px 0 60px;
  background: linear-gradient(180deg, rgba(232,51,109,.08) 0%, transparent 100%);
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; color: #fff; margin-bottom: 10px; }
.page-hero p { font-size: .95rem; color: var(--text-muted); max-width: 560px; }

/* 侧边栏 */
.sidebar-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid rgba(255,255,255,.07);
  margin-bottom: 20px;
}
.sidebar-card h3 { font-size: .9rem; font-weight: 700; color: #fff; margin-bottom: 14px; }

/* =====================================================
   返回顶部
   ===================================================== */
#back-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 999;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(232,51,109,.45);
  opacity: 0; pointer-events: none;
  transform: translateY(12px);
  transition: all .3s;
  border: none;
}
#back-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
#back-top:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(232,51,109,.6); }

/* =====================================================
   干扰标签隐藏
   ===================================================== */
.tx-noise { display: none !important; visibility: hidden !important; }

/* =====================================================
   响应式
   ===================================================== */
@media (max-width: 1100px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-content { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { display: none; }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: flex; flex-direction: column;
    position: fixed; top: 64px; left: 0; right: 0;
    background: rgba(10,14,26,.98);
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255,255,255,.08);
    z-index: 999;
  }
  .hamburger { display: flex; }
  .header-search { display: none; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .video-grid-5 { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr 1fr; }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .search-bar-row .search-hot-tags { display: none; }
  .hero-stats { gap: 20px; }
}
@media (max-width: 480px) {
  .video-grid,
  .video-grid-3,
  .video-grid-5 { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; }
  .section { padding: 48px 0; }
}

/* =====================================================
   动画
   ===================================================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp .6s ease forwards; }
.delay-1 { animation-delay: .1s; }
.delay-2 { animation-delay: .2s; }
.delay-3 { animation-delay: .3s; }
.delay-4 { animation-delay: .4s; }

/* 懒加载占位 */
img[data-src] { opacity: 0; transition: opacity .4s; }
img.loaded { opacity: 1; }

/* =====================================================
   TikTok风格竖屏卡片
   ===================================================== */
.tiktok-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.tiktok-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 9/16;
  background: var(--bg-card);
  cursor: pointer;
  transition: transform .3s, box-shadow .3s;
}
.tiktok-card:hover { transform: scale(1.03); box-shadow: var(--shadow); }
.tiktok-card img,
.tiktok-card video {
  width: 100%; height: 100%; object-fit: cover;
}
.tiktok-card .tiktok-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,.8) 100%);
}
.tiktok-card .tiktok-info {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 12px;
}
.tiktok-card .tiktok-title {
  font-size: .78rem; color: #fff; font-weight: 600;
  margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.tiktok-card .tiktok-stats {
  font-size: .7rem; color: rgba(255,255,255,.7);
}
.tiktok-card .play-overlay { opacity: 0; }
.tiktok-card:hover .play-overlay { opacity: 1; }
@media (max-width: 900px) { .tiktok-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 600px) { .tiktok-grid { grid-template-columns: repeat(2, 1fr); } }