/* ================================================
   抖音风 - 主样式文件
   品牌色：珊瑚红 #FF4757 / 深紫蓝 #2C2F6B / 星空蓝 #1A1D3A
   ================================================ */

/* === 全局重置与基础 === */
*, *::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;
  background: #0d0f1e;
  color: #e8eaf0;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: color .25s; }
a:hover { color: #FF4757; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* === CSS变量 === */
:root {
  --red: #FF4757;
  --red-dark: #e03444;
  --purple: #7B5EA7;
  --blue-dark: #1A1D3A;
  --blue-mid: #2C2F6B;
  --blue-light: #3A4080;
  --accent: #00D2FF;
  --gold: #FFD700;
  --text-main: #e8eaf0;
  --text-sub: #9ba3c0;
  --card-bg: #161929;
  --card-border: rgba(255,255,255,0.07);
  --gradient-brand: linear-gradient(135deg, #FF4757 0%, #7B5EA7 50%, #00D2FF 100%);
  --gradient-dark: linear-gradient(180deg, #1A1D3A 0%, #0d0f1e 100%);
  --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all .3s cubic-bezier(.4,0,.2,1);
}

/* === 滚动条 === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #0d0f1e; }
::-webkit-scrollbar-thumb { background: var(--blue-mid); border-radius: 3px; }

/* === 顶部公告栏 === */
.top-bar {
  background: var(--gradient-brand);
  text-align: center;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .5px;
}
.top-bar a { color: #fff; text-decoration: underline; margin-left: 8px; }

/* === 导航栏 === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13,15,30,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 0 24px;
}
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  height: 64px;
  gap: 24px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-logo img { width: 40px; height: 40px; border-radius: 8px; }
.nav-logo .brand-name {
  font-size: 22px;
  font-weight: 800;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.nav-menu a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-sub);
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover, .nav-menu a.active {
  color: #fff;
  background: rgba(255,71,87,0.15);
}
/* 搜索框 */
.nav-search {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 24px;
  padding: 6px 16px;
  gap: 8px;
  min-width: 200px;
  transition: var(--transition);
}
.nav-search:focus-within {
  border-color: var(--red);
  background: rgba(255,71,87,0.08);
}
.nav-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-main);
  font-size: 13px;
  width: 100%;
}
.nav-search input::placeholder { color: var(--text-sub); }
.nav-search button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-sub);
  font-size: 14px;
  padding: 0;
  transition: var(--transition);
}
.nav-search button:hover { color: var(--red); }
.nav-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.btn-login {
  padding: 7px 20px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-main);
  transition: var(--transition);
}
.btn-login:hover { border-color: var(--red); color: var(--red); }
.btn-join {
  padding: 7px 20px;
  background: var(--red);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  transition: var(--transition);
}
.btn-join:hover { background: var(--red-dark); transform: translateY(-1px); }
/* 汉堡菜单 */
.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: var(--transition); }

/* === 搜索栏（导航下方） === */
.search-bar-section {
  background: rgba(26,29,58,0.9);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  padding: 12px 24px;
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-bar-main {
  display: flex;
  align-items: center;
  flex: 1;
  max-width: 700px;
  background: rgba(255,255,255,0.06);
  border: 1.5px solid rgba(255,255,255,0.1);
  border-radius: 30px;
  padding: 10px 20px;
  gap: 10px;
  transition: var(--transition);
}
.search-bar-main:focus-within {
  border-color: var(--red);
  background: rgba(255,71,87,0.06);
  box-shadow: 0 0 0 3px rgba(255,71,87,0.12);
}
.search-bar-main input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-main);
  font-size: 15px;
}
.search-bar-main input::placeholder { color: var(--text-sub); }
.search-btn-main {
  padding: 8px 24px;
  background: var(--red);
  border: none;
  border-radius: 20px;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.search-btn-main:hover { background: var(--red-dark); }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-tag {
  padding: 4px 12px;
  background: rgba(255,255,255,0.06);
  border-radius: 14px;
  font-size: 12px;
  color: var(--text-sub);
  cursor: pointer;
  transition: var(--transition);
}
.search-tag:hover { background: rgba(255,71,87,0.2); color: var(--red); }

/* === 面包屑 === */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 24px;
  font-size: 13px;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb a { color: var(--text-sub); }
.breadcrumb a:hover { color: var(--red); }
.breadcrumb .sep { opacity: .4; }
.breadcrumb .current { color: var(--text-main); }

/* === 容器 === */
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.section { padding: 72px 0; }
.section-sm { padding: 48px 0; }

/* === 区块标题 === */
.section-head {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(255,71,87,0.15);
  border: 1px solid rgba(255,71,87,0.3);
  border-radius: 20px;
  font-size: 12px;
  color: var(--red);
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 12px;
}
.section-title span { background: var(--gradient-brand); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.section-desc { font-size: 15px; color: var(--text-sub); max-width: 600px; margin: 0 auto; }

/* === Hero区域 === */
.hero {
  position: relative;
  min-height: 560px;
  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 top;
  filter: brightness(.55);
  transform: scale(1.02);
  transition: transform 8s ease;
}
.hero:hover .hero-bg { transform: scale(1.05); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(13,15,30,.9) 0%, rgba(13,15,30,.4) 60%, transparent 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px;
  max-width: 640px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  background: rgba(255,71,87,0.2);
  border: 1px solid rgba(255,71,87,0.4);
  border-radius: 20px;
  font-size: 12px;
  color: #FF8A95;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero-badge::before { content: '●'; color: var(--red); animation: pulse 1.5s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.3} }
.hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,.5);
}
.hero h1 em { font-style: normal; background: var(--gradient-brand); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-sub {
  font-size: 16px;
  color: rgba(255,255,255,.75);
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--red);
  border-radius: 30px;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(255,71,87,.4);
}
.btn-primary:hover { background: var(--red-dark); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(255,71,87,.5); color: #fff; }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border: 1.5px solid rgba(255,255,255,.3);
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}
.btn-secondary:hover { border-color: var(--red); color: var(--red); }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 40px;
}
.hero-stat-item .num { font-size: 28px; font-weight: 800; color: #fff; }
.hero-stat-item .num span { font-size: 16px; color: var(--red); }
.hero-stat-item .label { font-size: 12px; color: var(--text-sub); margin-top: 2px; }

/* === 抖音风视频卡片 === */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.video-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--card-border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  border-color: rgba(255,71,87,.3);
}
.video-thumb {
  position: relative;
  padding-top: 133%;
  overflow: hidden;
}
.video-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s 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);
  transition: var(--transition);
  opacity: 0;
}
.video-card:hover .video-play-btn { opacity: 1; background: rgba(0,0,0,.35); }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,71,87,.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(.8);
  transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  border: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 18px solid #fff;
  margin-left: 4px;
}
.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 700;
  background: var(--red);
  color: #fff;
}
.video-badge.new { background: #00C853; }
.video-badge.hot { background: #FF6D00; }
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  padding: 2px 7px;
  background: rgba(0,0,0,.7);
  border-radius: 4px;
  font-size: 11px;
  color: #fff;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--text-sub);
}
.video-meta .views::before { content: '▶ '; }
.video-meta .likes::before { content: '♥ '; color: var(--red); }
.video-meta .comments::before { content: '💬 '; }
.video-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.video-tag {
  padding: 2px 8px;
  background: rgba(123,94,167,.2);
  border-radius: 10px;
  font-size: 11px;
  color: #b39ddb;
}

/* === 特色分类卡片 === */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}
.category-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}
.category-card:hover {
  border-color: var(--red);
  background: rgba(255,71,87,.08);
  transform: translateY(-4px);
}
.cat-icon {
  font-size: 36px;
  margin-bottom: 12px;
  display: block;
}
.cat-name { font-size: 15px; font-weight: 700; color: var(--text-main); margin-bottom: 4px; }
.cat-count { font-size: 12px; color: var(--text-sub); }

/* === 专家卡片 === */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card); border-color: rgba(123,94,167,.4); }
.expert-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid var(--purple);
}
.expert-name { font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.expert-title { font-size: 13px; color: var(--red); margin-bottom: 12px; }
.expert-desc { font-size: 13px; color: var(--text-sub); line-height: 1.7; margin-bottom: 16px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 16px; }
.award-tag {
  padding: 3px 10px;
  background: rgba(255,215,0,.1);
  border: 1px solid rgba(255,215,0,.3);
  border-radius: 10px;
  font-size: 11px;
  color: var(--gold);
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  padding: 6px 16px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-sm-outline {
  border: 1px solid rgba(255,255,255,.2);
  color: var(--text-sub);
}
.btn-sm-outline:hover { border-color: var(--red); color: var(--red); }
.btn-sm-fill { background: var(--red); color: #fff; }
.btn-sm-fill:hover { background: var(--red-dark); }

/* === AI赋能区 === */
.ai-section {
  position: relative;
  overflow: hidden;
}
.ai-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/ai-banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(.3);
}
.ai-content { position: relative; z-index: 2; }
.ai-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 40px;
}
.ai-feature-card {
  background: rgba(255,255,255,.05);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(0,210,255,.2);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.ai-feature-card:hover { border-color: var(--accent); background: rgba(0,210,255,.08); }
.ai-icon { font-size: 32px; margin-bottom: 12px; }
.ai-title { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.ai-desc { font-size: 13px; color: rgba(255,255,255,.65); line-height: 1.7; }

/* === 社区Banner === */
.community-section {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin: 0 24px;
}
.community-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/community-banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(.4);
}
.community-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 72px 24px;
}

/* === 用户评价 === */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.review-card:hover { border-color: rgba(255,71,87,.3); 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-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-user { font-size: 14px; font-weight: 600; color: var(--text-main); }
.review-date { font-size: 12px; color: var(--text-sub); }
.review-stars { color: var(--gold); font-size: 13px; margin-bottom: 10px; }
.review-text { font-size: 13px; color: var(--text-sub); line-height: 1.8; }
.review-platform { font-size: 11px; color: var(--text-sub); margin-top: 10px; opacity: .6; }

/* === FAQ === */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(255,71,87,.3); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  background: var(--card-bg);
  transition: var(--transition);
}
.faq-question:hover { color: #fff; background: rgba(255,71,87,.08); }
.faq-arrow {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(255,71,87,.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--red);
  transition: var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-arrow { transform: rotate(180deg); background: var(--red); color: #fff; }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease, padding .3s ease;
  background: rgba(255,255,255,.02);
}
.faq-item.open .faq-answer { max-height: 300px; padding: 16px 22px 20px; }
.faq-answer p { font-size: 14px; color: var(--text-sub); line-height: 1.8; }

/* === 合作品牌Logo墙 === */
.partner-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-logo {
  padding: 12px 24px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-sub);
  transition: var(--transition);
}
.partner-logo:hover { border-color: var(--red); color: var(--text-main); }

/* === 社交分享 === */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 14px; color: var(--text-sub); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}
.share-wechat { background: #07C160; color: #fff; }
.share-weibo { background: #E6162D; color: #fff; }
.share-douyin { background: #000; color: #fff; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; color: #fff; }
.share-btn:hover { opacity: .85; transform: translateY(-2px); }

/* === 联系我们 === */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
}
.contact-card:hover { border-color: rgba(255,71,87,.3); transform: translateY(-3px); }
.contact-icon { font-size: 36px; margin-bottom: 12px; }
.contact-title { font-size: 15px; font-weight: 700; color: var(--text-main); margin-bottom: 6px; }
.contact-value { font-size: 14px; color: var(--text-sub); }

/* === 页脚 === */
.site-footer {
  background: #080a16;
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 60px 0 0;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .brand-name { font-size: 24px; font-weight: 800; background: var(--gradient-brand); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 12px; }
.footer-brand p { font-size: 13px; color: var(--text-sub); line-height: 1.8; margin-bottom: 16px; }
.footer-qrcodes { display: flex; gap: 16px; }
.footer-qr { text-align: center; }
.footer-qr img { width: 80px; height: 80px; border-radius: 8px; border: 1px solid rgba(255,255,255,.1); }
.footer-qr p { font-size: 11px; color: var(--text-sub); margin-top: 6px; }
.footer-col h4 { font-size: 14px; font-weight: 700; color: var(--text-main); margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid rgba(255,255,255,.06); }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 13px; color: var(--text-sub); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--red); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 20px 24px;
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-copyright { font-size: 12px; color: var(--text-sub); }
.footer-links { display: flex; gap: 16px; }
.footer-links a { font-size: 12px; color: var(--text-sub); transition: var(--transition); }
.footer-links a:hover { color: var(--red); }
.update-time { font-size: 12px; color: var(--text-sub); }

/* === 弹幕效果 === */
.danmaku-bar {
  background: rgba(255,255,255,.03);
  border-top: 1px solid rgba(255,255,255,.05);
  border-bottom: 1px solid rgba(255,255,255,.05);
  padding: 10px 0;
  overflow: hidden;
  white-space: nowrap;
}
.danmaku-track {
  display: inline-flex;
  gap: 40px;
  animation: marquee 30s linear infinite;
}
.danmaku-track:hover { animation-play-state: paused; }
@keyframes marquee { from{transform:translateX(0)} to{transform:translateX(-50%)} }
.danmaku-item { font-size: 13px; color: var(--text-sub); flex-shrink: 0; }
.danmaku-item span { color: var(--red); margin-right: 6px; }

/* === 数据统计条 === */
.stats-bar {
  background: var(--blue-mid);
  padding: 20px 0;
}
.stats-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-item .num { font-size: 28px; font-weight: 800; color: #fff; }
.stat-item .num em { font-style: normal; color: var(--red); font-size: 18px; }
.stat-item .label { font-size: 12px; color: rgba(255,255,255,.6); margin-top: 4px; }

/* === 内页通用 === */
.page-hero {
  background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue-mid) 100%);
  padding: 60px 0;
  text-align: center;
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.page-hero h1 { font-size: clamp(28px, 4vw, 44px); font-weight: 800; color: #fff; margin-bottom: 12px; }
.page-hero p { font-size: 15px; color: var(--text-sub); max-width: 600px; margin: 0 auto; }

/* === 响应式 === */
@media (max-width: 1024px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-menu, .nav-search, .nav-actions { display: none; }
  .hamburger { display: flex; }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(13,15,30,.98);
    padding: 20px;
    border-bottom: 1px solid rgba(255,255,255,.06);
    z-index: 999;
  }
  .hero-content { padding: 60px 24px; }
  .hero-stats { gap: 20px; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .search-bar-section { display: none; }
  .section { padding: 48px 0; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .category-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 28px; }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
}

/* === 动画 === */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity .6s ease, transform .6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* === 加载动画 === */
.skeleton {
  background: linear-gradient(90deg, rgba(255,255,255,.05) 25%, rgba(255,255,255,.1) 50%, rgba(255,255,255,.05) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 6px;
}
@keyframes skeleton-loading { 0%{background-position:200% 0} 100%{background-position:-200% 0} }

/* === 标签云 === */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
  padding: 5px 14px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-sub);
  cursor: pointer;
  transition: var(--transition);
}
.tag-item:hover { background: rgba(255,71,87,.15); border-color: rgba(255,71,87,.3); color: var(--red); }
.tag-item.active { background: var(--red); border-color: var(--red); color: #fff; }

/* === How-To步骤 === */
.steps-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; }
.step-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
  transition: var(--transition);
}
.step-card:hover { border-color: rgba(255,71,87,.3); }
.step-num {
  width: 40px;
  height: 40px;
  background: var(--gradient-brand);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}
.step-title { font-size: 15px; font-weight: 700; color: var(--text-main); margin-bottom: 8px; }
.step-desc { font-size: 13px; color: var(--text-sub); line-height: 1.7; }