/* ============================================================
   91爆料网 - 汽车改装与视频社区 | cwkxccL.cn
   原创样式设计 v1.0
   ============================================================ */

/* ---- CSS变量 ---- */
:root {
  --brand-orange: #FF6B1A;
  --brand-dark: #0D0D1A;
  --brand-navy: #111827;
  --brand-card: #1A1F2E;
  --brand-border: #2A3045;
  --brand-text: #E8EAF0;
  --brand-muted: #8A93A8;
  --brand-accent: #00C8FF;
  --brand-green: #22C55E;
  --brand-yellow: #F59E0B;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 20px rgba(255,107,26,0.3);
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --font-main: 'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
}

/* ---- 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: var(--font-main);
  background: var(--brand-dark);
  color: var(--brand-text);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--brand-orange); text-decoration: none; transition: color var(--transition); }
a:hover { color: #FF9050; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; outline: none; font-family: var(--font-main); }
input, textarea, select { font-family: var(--font-main); }

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

/* ---- 容器 ---- */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }

/* ---- 顶部公告条 ---- */
.top-bar {
  background: linear-gradient(90deg, var(--brand-orange), #FF9050, var(--brand-orange));
  background-size: 200% 100%;
  animation: gradientShift 4s ease infinite;
  color: #fff;
  text-align: center;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
}
@keyframes gradientShift { 0%,100%{background-position:0% 50%} 50%{background-position:100% 50%} }

/* ---- 导航栏 ---- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13,13,26,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--brand-border);
  padding: 0 20px;
}
.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  height: 64px;
  gap: 24px;
}
.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.navbar-logo img.site-favicon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}
.navbar-logo .logo-text {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  letter-spacing: 1px;
}
.navbar-logo .logo-text span { color: var(--brand-orange); }
.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.navbar-nav a {
  color: var(--brand-text);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}
.navbar-nav a:hover, .navbar-nav a.active {
  color: var(--brand-orange);
  background: rgba(255,107,26,0.1);
}
.navbar-search {
  display: flex;
  align-items: center;
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: 24px;
  padding: 0 16px;
  height: 38px;
  gap: 8px;
  transition: border-color var(--transition);
}
.navbar-search:focus-within { border-color: var(--brand-orange); }
.navbar-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--brand-text);
  font-size: 13px;
  width: 180px;
}
.navbar-search input::placeholder { color: var(--brand-muted); }
.navbar-search button {
  background: none;
  color: var(--brand-muted);
  font-size: 16px;
  padding: 0;
  transition: color var(--transition);
}
.navbar-search button:hover { color: var(--brand-orange); }
.navbar-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.btn-nav-join {
  background: var(--brand-orange);
  color: #fff;
  padding: 8px 20px;
  border-radius: 24px;
  font-size: 13px;
  font-weight: 600;
  transition: all var(--transition);
}
.btn-nav-join:hover { background: #FF9050; transform: translateY(-1px); box-shadow: var(--shadow-glow); }
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.hamburger span { width: 22px; height: 2px; background: var(--brand-text); border-radius: 2px; transition: all var(--transition); }

/* ---- 英雄区 ---- */
.hero {
  position: relative;
  min-height: 600px;
  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(0.45);
  transform: scale(1.05);
  transition: transform 8s ease;
}
.hero:hover .hero-bg { transform: scale(1); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,13,26,0.8) 0%, rgba(255,107,26,0.1) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 20px;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,107,26,0.15);
  border: 1px solid rgba(255,107,26,0.4);
  color: var(--brand-orange);
  padding: 6px 14px;
  border-radius: 24px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(32px, 5vw, 60px);
  font-weight: 900;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 16px;
}
.hero h1 .highlight { color: var(--brand-orange); }
.hero-sub {
  font-size: 18px;
  color: rgba(255,255,255,0.75);
  max-width: 560px;
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brand-orange);
  color: #fff;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 700;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(255,107,26,0.4);
}
.btn-primary:hover { background: #FF9050; transform: translateY(-2px); box-shadow: 0 8px 30px rgba(255,107,26,0.5); color: #fff; }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  transition: all var(--transition);
  backdrop-filter: blur(4px);
}
.btn-secondary:hover { background: rgba(255,255,255,0.18); transform: translateY(-2px); color: #fff; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  flex-wrap: wrap;
}
.hero-stat { text-align: left; }
.hero-stat .num { font-size: 28px; font-weight: 900; color: var(--brand-orange); }
.hero-stat .label { font-size: 12px; color: var(--brand-muted); margin-top: 2px; }

/* ---- 区块标题 ---- */
.section-header { text-align: center; margin-bottom: 48px; }
.section-header .tag {
  display: inline-block;
  background: rgba(255,107,26,0.12);
  color: var(--brand-orange);
  padding: 4px 14px;
  border-radius: 24px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.section-header h2 {
  font-size: clamp(24px, 3.5vw, 38px);
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}
.section-header h2 span { color: var(--brand-orange); }
.section-header p { color: var(--brand-muted); max-width: 560px; margin: 0 auto; font-size: 15px; }
.section-header-left { text-align: left; }
.section-header-left p { margin: 0; }

/* ---- 视频卡片 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.video-card {
  background: var(--brand-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--brand-border);
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  border-color: var(--brand-orange);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(255,107,26,0.2);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #0a0a14;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: var(--brand-orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(255,107,26,0.6);
  transform: scale(0.8);
  transition: transform var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--brand-orange);
  color: #fff;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.video-info { padding: 14px 16px; }
.video-info h3 {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--brand-muted);
}
.video-meta .views::before { content: '▶ '; }
.video-meta .likes::before { content: '♥ '; color: #FF6B6B; }
.video-meta .comments::before { content: '💬 '; }
.video-author { display: flex; align-items: center; gap: 6px; margin-bottom: 8px; }
.video-author .avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-orange), #FF9050);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.video-author .name { font-size: 12px; color: var(--brand-muted); }

/* ---- 特色视频大卡片 ---- */
.video-featured {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}
.video-card-lg .video-thumb { aspect-ratio: 16/9; }
.video-card-lg .video-info h3 { font-size: 16px; }

/* ---- 功能模块卡片 ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-orange), var(--brand-accent));
  transform: scaleX(0);
  transition: transform var(--transition);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover { transform: translateY(-4px); border-color: var(--brand-orange); box-shadow: var(--shadow-card); }
.feature-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,107,26,0.12);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin: 0 auto 16px;
  transition: all var(--transition);
}
.feature-card:hover .feature-icon { background: rgba(255,107,26,0.2); transform: scale(1.1); }
.feature-card h3 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.feature-card p { font-size: 13px; color: var(--brand-muted); line-height: 1.6; }

/* ---- 专家卡片 ---- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
}
.expert-card:hover { transform: translateY(-4px); border-color: var(--brand-orange); box-shadow: var(--shadow-card); }
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--brand-orange), #FF9050);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 900;
  color: #fff;
  border: 3px solid var(--brand-border);
  transition: border-color var(--transition);
}
.expert-card:hover .expert-avatar { border-color: var(--brand-orange); }
.expert-card h3 { font-size: 16px; font-weight: 800; color: #fff; margin-bottom: 4px; }
.expert-role { font-size: 12px; color: var(--brand-orange); font-weight: 600; margin-bottom: 10px; }
.expert-desc { font-size: 13px; color: var(--brand-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(255,107,26,0.1);
  border: 1px solid rgba(255,107,26,0.2);
  color: var(--brand-orange);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 12px;
}
.expert-actions { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  transition: all var(--transition);
}
.btn-sm-primary { background: var(--brand-orange); color: #fff; }
.btn-sm-primary:hover { background: #FF9050; color: #fff; }
.btn-sm-outline { background: transparent; border: 1px solid var(--brand-border); color: var(--brand-text); }
.btn-sm-outline:hover { border-color: var(--brand-orange); color: var(--brand-orange); }

/* ---- 评价区 ---- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition);
}
.review-card:hover { border-color: var(--brand-orange); transform: translateY(-2px); }
.review-stars { color: var(--brand-yellow); font-size: 14px; margin-bottom: 10px; }
.review-text { font-size: 14px; color: var(--brand-text); line-height: 1.7; margin-bottom: 14px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-accent), var(--brand-orange));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-size: 13px; font-weight: 700; color: #fff; }
.review-date { font-size: 11px; color: var(--brand-muted); }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.open { border-color: var(--brand-orange); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  transition: color var(--transition);
  user-select: none;
}
.faq-question:hover { color: var(--brand-orange); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(255,107,26,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--brand-orange);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--brand-muted);
  font-size: 14px;
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 18px; }

/* ---- 合作品牌墙 ---- */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-logo {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 16px 28px;
  font-size: 14px;
  font-weight: 700;
  color: var(--brand-muted);
  transition: all var(--transition);
  letter-spacing: 1px;
}
.partner-logo:hover { border-color: var(--brand-orange); color: var(--brand-orange); transform: translateY(-2px); }

/* ---- 联系区 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.contact-card {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.contact-card h3 { font-size: 18px; font-weight: 800; color: #fff; margin-bottom: 20px; }
.contact-item { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 16px; }
.contact-icon {
  width: 38px;
  height: 38px;
  background: rgba(255,107,26,0.12);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}
.contact-label { font-size: 12px; color: var(--brand-muted); margin-bottom: 2px; }
.contact-value { font-size: 14px; color: var(--brand-text); font-weight: 500; }
.qrcode-row { display: flex; gap: 20px; margin-top: 20px; }
.qrcode-item { text-align: center; }
.qrcode-item img { width: 100px; height: 100px; border-radius: var(--radius-sm); border: 2px solid var(--brand-border); }
.qrcode-item p { font-size: 11px; color: var(--brand-muted); margin-top: 6px; }

/* ---- 分享按钮 ---- */
.share-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.share-label { font-size: 13px; color: var(--brand-muted); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 24px;
  font-size: 12px;
  font-weight: 600;
  transition: all var(--transition);
  border: 1px solid var(--brand-border);
  color: var(--brand-text);
  background: var(--brand-card);
}
.share-btn:hover { transform: translateY(-2px); color: #fff; }
.share-btn.wechat:hover { background: #07C160; border-color: #07C160; }
.share-btn.weibo:hover { background: #E6162D; border-color: #E6162D; }
.share-btn.douyin:hover { background: #010101; border-color: #69C9D0; }
.share-btn.bilibili:hover { background: #00A1D6; border-color: #00A1D6; }

/* ---- 面包屑 ---- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--brand-muted);
  padding: 14px 0;
}
.breadcrumb a { color: var(--brand-muted); }
.breadcrumb a:hover { color: var(--brand-orange); }
.breadcrumb .sep { color: var(--brand-border); }
.breadcrumb .current { color: var(--brand-text); }

/* ---- 标签云 ---- */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-pill {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  color: var(--brand-muted);
  font-size: 12px;
  padding: 5px 14px;
  border-radius: 24px;
  transition: all var(--transition);
  cursor: pointer;
}
.tag-pill:hover, .tag-pill.active { background: rgba(255,107,26,0.12); border-color: var(--brand-orange); color: var(--brand-orange); }

/* ---- 统计条 ---- */
.stats-bar {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item .num { font-size: 32px; font-weight: 900; color: var(--brand-orange); }
.stat-item .unit { font-size: 14px; color: var(--brand-orange); font-weight: 700; }
.stat-item .label { font-size: 13px; color: var(--brand-muted); margin-top: 4px; }

/* ---- AI赋能区 ---- */
.ai-section {
  background: linear-gradient(135deg, #0D0D1A 0%, #111827 50%, #0D0D1A 100%);
  position: relative;
  overflow: hidden;
}
.ai-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 60% 40%, rgba(0,200,255,0.05) 0%, transparent 60%),
              radial-gradient(circle at 20% 80%, rgba(255,107,26,0.05) 0%, transparent 50%);
  pointer-events: none;
}
.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.ai-visual img { border-radius: var(--radius-lg); box-shadow: var(--shadow-card); }
.ai-features { display: flex; flex-direction: column; gap: 16px; }
.ai-feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}
.ai-feature-item:hover { border-color: var(--brand-accent); background: rgba(0,200,255,0.04); }
.ai-feature-icon {
  width: 44px;
  height: 44px;
  background: rgba(0,200,255,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.ai-feature-item h4 { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.ai-feature-item p { font-size: 13px; color: var(--brand-muted); line-height: 1.6; }

/* ---- 页脚 ---- */
.footer {
  background: #080810;
  border-top: 1px solid var(--brand-border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo-text { font-size: 22px; font-weight: 900; color: #fff; margin-bottom: 12px; }
.footer-brand .logo-text span { color: var(--brand-orange); }
.footer-brand p { font-size: 13px; color: var(--brand-muted); line-height: 1.8; max-width: 280px; }
.footer-col h4 { font-size: 13px; font-weight: 700; color: #fff; letter-spacing: 1px; margin-bottom: 16px; text-transform: uppercase; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 13px; color: var(--brand-muted); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--brand-orange); }
.footer-bottom {
  border-top: 1px solid var(--brand-border);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: 12px; color: var(--brand-muted); }
.footer-bottom a { color: var(--brand-muted); }
.footer-bottom a:hover { color: var(--brand-orange); }
.footer-social { display: flex; gap: 10px; }
.social-icon {
  width: 34px;
  height: 34px;
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--brand-muted);
  transition: all var(--transition);
}
.social-icon:hover { border-color: var(--brand-orange); color: var(--brand-orange); transform: translateY(-2px); }

/* ---- 分类标签导航 ---- */
.cat-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.cat-tab {
  padding: 8px 20px;
  border-radius: 24px;
  font-size: 13px;
  font-weight: 600;
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  color: var(--brand-muted);
  cursor: pointer;
  transition: all var(--transition);
}
.cat-tab:hover, .cat-tab.active { background: var(--brand-orange); border-color: var(--brand-orange); color: #fff; }

/* ---- 工作坊图片区 ---- */
.workshop-section { position: relative; overflow: hidden; }
.workshop-img { border-radius: var(--radius-lg); overflow: hidden; position: relative; }
.workshop-img img { width: 100%; height: 400px; object-fit: cover; }
.workshop-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(13,13,26,0.9) 0%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: 32px;
}
.workshop-img-overlay h3 { font-size: 22px; font-weight: 800; color: #fff; }

/* ---- 加入社区引导 ---- */
.join-section {
  background: linear-gradient(135deg, rgba(255,107,26,0.1), rgba(0,200,255,0.05));
  border: 1px solid rgba(255,107,26,0.2);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
}
.join-section h2 { font-size: 32px; font-weight: 900; color: #fff; margin-bottom: 12px; }
.join-section p { font-size: 16px; color: var(--brand-muted); margin-bottom: 28px; max-width: 500px; margin-left: auto; margin-right: auto; }
.join-steps {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.join-step { text-align: center; max-width: 160px; }
.join-step-num {
  width: 44px;
  height: 44px;
  background: var(--brand-orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 900;
  color: #fff;
  margin: 0 auto 10px;
}
.join-step h4 { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.join-step p { font-size: 12px; color: var(--brand-muted); }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .video-featured { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .navbar-nav { display: none; }
  .navbar-search { display: none; }
  .hamburger { display: flex; }
  .hero { min-height: 480px; }
  .hero-stats { gap: 24px; }
  .section { padding: 50px 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .join-section { padding: 40px 20px; }
  .join-section h2 { font-size: 24px; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 26px; }
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
  .stats-bar { grid-template-columns: 1fr 1fr; }
  .video-grid { grid-template-columns: 1fr; }
}

/* ---- 移动端菜单 ---- */
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(13,13,26,0.98);
  z-index: 999;
  padding: 24px 20px;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  color: var(--brand-text);
  font-size: 16px;
  font-weight: 600;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border-bottom: 1px solid var(--brand-border);
  transition: all var(--transition);
}
.mobile-menu a:hover { color: var(--brand-orange); background: rgba(255,107,26,0.08); }
.mobile-search {
  display: flex;
  align-items: center;
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  gap: 10px;
  margin-bottom: 16px;
}
.mobile-search input { background: none; border: none; outline: none; color: var(--brand-text); font-size: 14px; flex: 1; }

/* ---- 视频播放弹窗 ---- */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.video-modal-inner {
  background: var(--brand-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  max-width: 800px;
  width: 90%;
  position: relative;
}
.video-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  transition: background var(--transition);
}
.video-modal-close:hover { background: var(--brand-orange); }
.video-player-placeholder {
  aspect-ratio: 16/9;
  background: #000;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  color: var(--brand-muted);
  font-size: 14px;
}
.video-player-placeholder .big-play {
  width: 72px;
  height: 72px;
  background: var(--brand-orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.video-player-placeholder .big-play::after {
  content: '';
  border-style: solid;
  border-width: 14px 0 14px 24px;
  border-color: transparent transparent transparent #fff;
  margin-left: 6px;
}

/* ---- 加载动画 ---- */
.skeleton {
  background: linear-gradient(90deg, var(--brand-card) 25%, var(--brand-border) 50%, var(--brand-card) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton-loading { 0%{background-position:200% 0} 100%{background-position:-200% 0} }

/* ---- 通知徽章 ---- */
.badge {
  display: inline-block;
  background: var(--brand-orange);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 10px;
  vertical-align: middle;
  margin-left: 4px;
}
.badge-new { background: var(--brand-green); }
.badge-hot { background: #EF4444; }

/* ---- 干扰标签隐藏 ---- */
.cwkxccL-noise { display: none !important; }