/* =============================================
   91 修车改装视频社区 - cirkev.cn
   主题：深夜蓝光工坊·科技极速·数字改装
   主色：#0066ff（科技蓝）
   背景：#060c18（极深夜蓝）
   强调：#00d4ff（青蓝）
   ============================================= */

/* === 基础重置 === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', 'Helvetica Neue', Arial, sans-serif;
  background: #060c18;
  color: #c8d8f0;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: #00aaff; text-decoration: none; transition: color 0.25s; }
a:hover { color: #00d4ff; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea { font-family: inherit; }

/* === CSS变量 === */
:root {
  --blue-primary: #0066ff;
  --blue-light:   #00aaff;
  --blue-bright:  #00d4ff;
  --bg-deep:      #060c18;
  --bg-card:      #0d1b2e;
  --bg-hover:     #112240;
  --border:       #1a3050;
  --text-main:    #c8d8f0;
  --text-muted:   #6888aa;
  --text-bright:  #e8f4ff;
  --shadow-blue:  0 0 20px rgba(0,102,255,0.3);
  --radius:       12px;
  --radius-sm:    8px;
  --transition:   0.3s ease;
}

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

/* === 通用布局 === */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-alt { background: #080f1e; }
.section-dark { background: #040810; }

.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
  display: inline-block;
  background: rgba(0,102,255,0.15);
  color: var(--blue-bright);
  border: 1px solid rgba(0,102,255,0.3);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text-bright);
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}
.section-title span { color: var(--blue-light); }
.section-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* === 按钮 === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, #0066ff, #0044cc);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0,102,255,0.4);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #0080ff, #0055dd);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,102,255,0.6);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--blue-light);
  border: 1.5px solid var(--blue-primary);
}
.btn-outline:hover {
  background: rgba(0,102,255,0.1);
  color: var(--blue-bright);
  border-color: var(--blue-bright);
}
.btn-ghost {
  background: rgba(255,255,255,0.05);
  color: var(--text-main);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: rgba(255,255,255,0.1); color: var(--text-bright); }

/* === Header === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(6,12,24,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.header-logo { flex-shrink: 0; }
.logo-link { display: flex; align-items: center; gap: 10px; }
.logo-img { width: 40px; height: 40px; border-radius: 8px; object-fit: cover; }
.logo-text {
  font-size: 1.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, #0066ff, #00d4ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1px;
}
.main-nav { flex: 1; }
.nav-list { display: flex; align-items: center; gap: 4px; }
.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: 6px;
  transition: all var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--blue-light);
  background: rgba(0,102,255,0.1);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  margin-left: auto;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition);
}

/* === 搜索框 === */
.header-search {
  background: rgba(13,27,46,0.9);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.search-wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
}
.search-form { display: flex; align-items: center; gap: 0; max-width: 640px; }
.search-input {
  flex: 1;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  padding: 10px 16px;
  font-size: 0.9rem;
  color: var(--text-main);
  outline: none;
  transition: border-color var(--transition);
}
.search-input:focus { border-color: var(--blue-primary); }
.search-input::placeholder { color: var(--text-muted); }
.search-btn {
  background: var(--blue-primary);
  color: #fff;
  border: 1.5px solid var(--blue-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.search-btn:hover { background: #0080ff; }
.search-toast {
  position: absolute;
  top: calc(100% + 8px);
  left: 20px;
  background: var(--bg-card);
  border: 1px solid var(--blue-primary);
  color: var(--blue-light);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  display: none;
  z-index: 100;
  box-shadow: var(--shadow-blue);
}

/* === Hero Banner === */
.hero-banner {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(6,12,24,0.92) 0%, rgba(0,40,100,0.6) 50%, rgba(6,12,24,0.85) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 20px;
  width: 100%;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,102,255,0.2);
  border: 1px solid rgba(0,102,255,0.4);
  color: var(--blue-bright);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  letter-spacing: 1px;
  margin-bottom: 20px;
}
.hero-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--blue-bright);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100%{opacity:1;} 50%{opacity:0.3;} }
.hero-title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 900;
  color: var(--text-bright);
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-title .brand-highlight {
  background: linear-gradient(135deg, #0066ff, #00d4ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 56px; }
.hero-stats { display: flex; gap: 40px; flex-wrap: wrap; }
.hero-stat { }
.hero-stat-num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--blue-light);
  line-height: 1;
  margin-bottom: 4px;
}
.hero-stat-label { font-size: 0.8rem; color: var(--text-muted); }

/* === 修车传媒模块 === */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}
.media-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.media-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-primary), var(--blue-bright));
  transform: scaleX(0);
  transition: transform var(--transition);
}
.media-card:hover { transform: translateY(-6px); border-color: var(--blue-primary); box-shadow: var(--shadow-blue); }
.media-card:hover::before { transform: scaleX(1); }
.media-icon {
  width: 56px;
  height: 56px;
  background: rgba(0,102,255,0.15);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.6rem;
  transition: background var(--transition);
}
.media-card:hover .media-icon { background: rgba(0,102,255,0.3); }
.media-card h3 { font-size: 1rem; font-weight: 700; color: var(--text-bright); margin-bottom: 8px; }
.media-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }

/* === 视频卡片 === */
.video-filter {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  justify-content: center;
}
.filter-btn {
  padding: 7px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--blue-primary);
  color: #fff;
  border-color: var(--blue-primary);
}
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,102,255,0.25); border-color: var(--blue-primary); }
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, #0d1b2e, #112240);
  overflow: hidden;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-play-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .video-play-overlay { opacity: 1; }
.play-btn-circle {
  width: 56px;
  height: 56px;
  background: rgba(0,102,255,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: transform var(--transition);
  box-shadow: 0 0 30px rgba(0,102,255,0.8);
}
.video-card:hover .play-btn-circle { transform: scale(1); }
.play-btn-circle svg { margin-left: 4px; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-quality-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--blue-primary);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-bright);
  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: 0.78rem;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tag {
  display: inline-block;
  background: rgba(0,102,255,0.15);
  color: var(--blue-light);
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
  margin-top: 8px;
}

/* === 视频模态框 === */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.video-modal.active { display: flex; }
.modal-inner {
  background: var(--bg-card);
  border-radius: var(--radius);
  width: 100%;
  max-width: 900px;
  border: 1px solid var(--border);
  overflow: hidden;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.modal-title { font-size: 1rem; font-weight: 600; color: var(--text-bright); }
.modal-close {
  width: 32px;
  height: 32px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 1.2rem;
  transition: all var(--transition);
}
.modal-close:hover { background: rgba(255,0,0,0.2); color: #ff4444; }
.modal-video-wrap {
  aspect-ratio: 16/9;
  background: #000;
  position: relative;
}
.modal-video-wrap video { width: 100%; height: 100%; }
.modal-video-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: linear-gradient(135deg, #0d1b2e, #060c18);
}
.modal-video-placeholder p { color: var(--text-muted); font-size: 0.9rem; }

/* === TikTok短视频区 === */
.tiktok-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}
.tiktok-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
}
.tiktok-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-blue); }
.tiktok-thumb {
  aspect-ratio: 9/16;
  background: linear-gradient(180deg, #0d1b2e, #060c18);
  position: relative;
  overflow: hidden;
}
.tiktok-thumb img { width: 100%; height: 100%; object-fit: cover; }
.tiktok-play {
  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);
}
.tiktok-card:hover .tiktok-play { opacity: 1; }
.tiktok-play-icon {
  width: 40px;
  height: 40px;
  background: rgba(0,102,255,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.tiktok-info { padding: 10px 12px; }
.tiktok-title { font-size: 0.8rem; font-weight: 600; color: var(--text-bright); margin-bottom: 4px; line-height: 1.3; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.tiktok-views { font-size: 0.72rem; color: var(--text-muted); }

/* === AI赋能模块 === */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.ai-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--blue-primary), var(--blue-bright));
  transform: scaleX(0);
  transition: transform var(--transition);
}
.ai-card:hover { border-color: var(--blue-primary); box-shadow: var(--shadow-blue); }
.ai-card:hover::after { transform: scaleX(1); }
.ai-card-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(0,102,255,0.2), rgba(0,212,255,0.1));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
  border: 1px solid rgba(0,102,255,0.2);
}
.ai-card h3 { font-size: 1.05rem; font-weight: 700; color: var(--text-bright); margin-bottom: 10px; }
.ai-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 16px; }
.ai-features { display: flex; flex-wrap: wrap; gap: 6px; }
.ai-feature-tag {
  background: rgba(0,102,255,0.1);
  color: var(--blue-light);
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 4px;
  border: 1px solid rgba(0,102,255,0.2);
}

/* === 社区功能 === */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.community-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.community-card:hover { border-color: var(--blue-primary); transform: translateX(4px); }
.community-icon {
  width: 48px;
  height: 48px;
  background: rgba(0,102,255,0.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}
.community-body h3 { font-size: 0.95rem; font-weight: 700; color: var(--text-bright); margin-bottom: 6px; }
.community-body p { font-size: 0.83rem; color: var(--text-muted); line-height: 1.6; }
.community-count { font-size: 0.78rem; color: var(--blue-light); margin-top: 6px; }

/* === 专家展示 === */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition);
}
.expert-card:hover { border-color: var(--blue-primary); transform: translateY(-6px); box-shadow: var(--shadow-blue); }
.expert-avatar {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--blue-primary), var(--blue-bright));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: 900;
  color: #fff;
  margin: 0 auto 16px;
  border: 3px solid rgba(0,102,255,0.3);
}
.expert-name { font-size: 1.05rem; font-weight: 700; color: var(--text-bright); margin-bottom: 4px; }
.expert-role { font-size: 0.82rem; color: var(--blue-light); margin-bottom: 10px; }
.expert-bio { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 14px; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 14px; }
.expert-tag {
  background: rgba(0,102,255,0.1);
  color: var(--blue-light);
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 4px;
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.expert-btn {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 500;
  transition: all var(--transition);
}
.expert-btn-primary {
  background: var(--blue-primary);
  color: #fff;
}
.expert-btn-primary:hover { background: #0080ff; color: #fff; }
.expert-btn-outline {
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.expert-btn-outline:hover { border-color: var(--blue-primary); color: var(--blue-light); }

/* === 品牌Logo墙 === */
.brand-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}
.brand-logo-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 24px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: all var(--transition);
  min-width: 120px;
  text-align: center;
}
.brand-logo-item:hover {
  border-color: var(--blue-primary);
  color: var(--blue-light);
  background: rgba(0,102,255,0.08);
}

/* === 加入社区步骤 === */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  position: relative;
  transition: all var(--transition);
}
.step-card:hover { border-color: var(--blue-primary); }
.step-num {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--blue-primary), var(--blue-bright));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 900;
  color: #fff;
  margin: 0 auto 16px;
}
.step-card h3 { font-size: 0.95rem; font-weight: 700; color: var(--text-bright); margin-bottom: 8px; }
.step-card p { font-size: 0.83rem; color: var(--text-muted); line-height: 1.6; }

/* === FAQ === */
.faq-list { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.open { border-color: var(--blue-primary); }
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  cursor: pointer;
  gap: 16px;
  user-select: none;
}
.faq-q-text { font-size: 0.95rem; font-weight: 600; color: var(--text-bright); }
.faq-icon {
  width: 24px;
  height: 24px;
  background: rgba(0,102,255,0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-light);
  font-size: 1rem;
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--blue-primary); color: #fff; }
.faq-a {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 20px 18px; }

/* === 用户评论 === */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}
.review-card:hover { border-color: var(--blue-primary); transform: translateY(-3px); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.review-avatar {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--blue-primary), var(--blue-bright));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-user-info { flex: 1; }
.review-name { font-size: 0.9rem; font-weight: 600; color: var(--text-bright); }
.review-date { font-size: 0.75rem; color: var(--text-muted); }
.review-stars { color: #ffd700; font-size: 0.85rem; letter-spacing: 1px; }
.review-text { font-size: 0.87rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 12px; }
.review-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.review-tag {
  background: rgba(0,102,255,0.1);
  color: var(--blue-light);
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
}

/* === 联系我们 === */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}
.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition);
}
.contact-card:hover { border-color: var(--blue-primary); transform: translateY(-4px); box-shadow: var(--shadow-blue); }
.contact-icon {
  font-size: 2rem;
  margin-bottom: 14px;
  display: block;
}
.contact-card h3 { font-size: 0.95rem; font-weight: 700; color: var(--text-bright); margin-bottom: 8px; }
.contact-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }
.contact-card a { color: var(--blue-light); }
.contact-card a:hover { color: var(--blue-bright); }

/* === 分享区 === */
.share-section { padding: 40px 0; }
.share-inner { max-width: 600px; margin: 0 auto; text-align: center; }
.share-title { font-size: 1.1rem; font-weight: 700; color: var(--text-bright); margin-bottom: 20px; }
.share-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.share-btn {
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition);
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: var(--bg-card);
}
.share-btn:hover { border-color: var(--blue-primary); color: var(--blue-light); background: rgba(0,102,255,0.1); }

/* === 面包屑 === */
.breadcrumb-nav { padding: 12px 0; }
.breadcrumb-list { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.breadcrumb-item { font-size: 0.82rem; color: var(--text-muted); }
.breadcrumb-item a { color: var(--blue-light); }
.breadcrumb-item a:hover { color: var(--blue-bright); }
.breadcrumb-item:not(:last-child)::after { content: '/'; margin-left: 8px; color: var(--border); }
.breadcrumb-item.active { color: var(--text-main); }

/* === Footer === */
.site-footer { background: #040810; border-top: 1px solid var(--border); margin-top: 0; }
.footer-main { padding: 60px 0 40px; max-width: 1280px; margin: 0 auto; padding-left: 20px; padding-right: 20px; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
}
.footer-logo-link { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-logo { width: 48px; height: 48px; border-radius: 8px; }
.footer-brand-name { font-size: 1.4rem; font-weight: 900; background: linear-gradient(135deg, #0066ff, #00d4ff); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.footer-brand-desc { font-size: 0.83rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-btn {
  padding: 6px 14px;
  background: rgba(0,102,255,0.1);
  border: 1px solid rgba(0,102,255,0.2);
  border-radius: 6px;
  color: var(--blue-light);
  font-size: 0.78rem;
  transition: all var(--transition);
}
.social-btn:hover { background: rgba(0,102,255,0.2); border-color: var(--blue-primary); }
.footer-col-title { font-size: 0.9rem; font-weight: 700; color: var(--text-bright); margin-bottom: 16px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 0.83rem; color: var(--text-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--blue-light); }
.footer-qr-group { display: flex; gap: 16px; margin-bottom: 16px; }
.footer-qr-item { text-align: center; }
.qr-placeholder {
  width: 80px;
  height: 80px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 6px;
}
.qr-label { font-size: 0.72rem; color: var(--text-muted); }
.footer-contact-info { font-size: 0.78rem; color: var(--text-muted); line-height: 2; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px;
  max-width: 1280px;
  margin: 0 auto;
}
.footer-bottom-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.footer-copyright { font-size: 0.78rem; color: var(--text-muted); }
.footer-update { font-size: 0.78rem; color: var(--text-muted); }

/* === 内页通用 === */
.page-hero {
  background: linear-gradient(135deg, #060c18, #0d1b2e);
  border-bottom: 1px solid var(--border);
  padding: 48px 0;
}
.page-hero-inner { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.page-hero h1 { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 800; color: var(--text-bright); margin-bottom: 10px; }
.page-hero h1 span { color: var(--blue-light); }
.page-hero p { font-size: 0.95rem; color: var(--text-muted); }

/* === 响应式 === */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand-col { grid-column: 1 / -1; }
}
@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .hero-banner { min-height: 480px; }
  .hero-stats { gap: 24px; }
  .main-nav { display: none; position: fixed; top: 64px; left: 0; right: 0; background: rgba(6,12,24,0.98); border-bottom: 1px solid var(--border); padding: 16px 20px; z-index: 999; }
  .main-nav.open { display: block; }
  .nav-list { flex-direction: column; gap: 4px; }
  .nav-link { padding: 12px 16px; }
  .nav-toggle { display: flex; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-qr-group { justify-content: center; }
  .hero-btns { gap: 10px; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .tiktok-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}
@media (max-width: 480px) {
  .hero-title { font-size: 1.8rem; }
  .hero-stats { gap: 16px; }
  .hero-stat-num { font-size: 1.5rem; }
  .video-grid { grid-template-columns: 1fr; }
  .tiktok-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
}

/* === 动画 === */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideInLeft { from { opacity: 0; transform: translateX(-20px); } to { opacity: 1; transform: translateX(0); } }
.fade-in-up { animation: fadeInUp 0.6s ease forwards; }
.slide-in-left { animation: slideInLeft 0.6s ease forwards; }

/* === 懒加载占位 === */
img[loading="lazy"] { background: var(--bg-card); }

/* === 视频占位符 === */
.video-placeholder {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, #0d1b2e 0%, #060c18 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}
.video-placeholder-icon { font-size: 2.5rem; opacity: 0.5; }