/* ============================================
   91 修车改装视频社区 - 原创CSS
   配色：暗红 #8B0000 / 金色 #D4A017 / 深灰 #1a1a2e / 炭黑 #0f0f1a
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

:root {
  --primary: #8B0000;
  --primary-light: #b71c1c;
  --accent: #D4A017;
  --accent-light: #f0c040;
  --bg-dark: #0f0f1a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #252545;
  --text-main: #e0e0e0;
  --text-muted: #999;
  --text-bright: #fff;
  --border: #2a2a4a;
  --shadow: rgba(139,0,0,0.3);
  --radius: 12px;
  --transition: all 0.3s ease;
}

* { margin:0; padding:0; box-sizing:border-box; }

html { scroll-behavior:smooth; font-size:16px; }

body {
  font-family:'Noto Sans SC','Microsoft YaHei','PingFang SC',sans-serif;
  background:var(--bg-dark);
  color:var(--text-main);
  line-height:1.8;
  overflow-x:hidden;
}

a { color:var(--accent); text-decoration:none; transition:var(--transition); }
a:hover { color:var(--accent-light); }

img { max-width:100%; height:auto; display:block; }

.container { max-width:1200px; margin:0 auto; padding:0 20px; }

/* === 干扰标签隐藏 === */
.seo-noise { position:absolute; left:-9999px; top:-9999px; width:0; height:0; overflow:hidden; opacity:0; pointer-events:none; z-index:-1; }

/* === 顶部导航 === */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(15,15,26,0.95);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  padding:0 20px;
}
.header-inner {
  max-width:1200px; margin:0 auto;
  display:flex; align-items:center; justify-content:space-between;
  height:68px;
}
.site-logo { display:flex; align-items:center; gap:10px; }
.site-logo img { height:42px; width:42px; border-radius:8px; }
.site-logo span { font-size:1.5rem; font-weight:900; color:var(--accent); letter-spacing:2px; }

.main-nav { display:flex; gap:6px; }
.main-nav a {
  padding:8px 16px; border-radius:8px; font-size:0.9rem; font-weight:500;
  color:var(--text-main); transition:var(--transition);
}
.main-nav a:hover, .main-nav a.active {
  background:var(--primary); color:var(--text-bright);
}

.mobile-toggle { display:none; background:none; border:none; color:var(--text-bright); font-size:1.5rem; cursor:pointer; }

/* === 搜索框 === */
.search-bar {
  background:var(--bg-card); border-bottom:1px solid var(--border);
  padding:12px 20px; margin-top:68px;
}
.search-inner {
  max-width:600px; margin:0 auto; display:flex; gap:8px;
}
.search-inner input {
  flex:1; padding:10px 18px; border-radius:25px; border:1px solid var(--border);
  background:var(--bg-dark); color:var(--text-main); font-size:0.95rem;
  outline:none; transition:var(--transition);
}
.search-inner input:focus { border-color:var(--accent); box-shadow:0 0 8px var(--shadow); }
.search-inner button {
  padding:10px 24px; border-radius:25px; border:none;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:#fff; font-weight:700; cursor:pointer; transition:var(--transition);
}
.search-inner button:hover { transform:scale(1.05); box-shadow:0 4px 15px var(--shadow); }

/* === Hero Banner === */
.hero-banner {
  position:relative; width:100%; min-height:520px;
  display:flex; align-items:center; justify-content:center;
  overflow:hidden; margin-top:0;
}
.hero-banner img.hero-bg {
  position:absolute; top:0; left:0; width:100%; height:100%;
  object-fit:cover; filter:brightness(0.4);
}
.hero-content {
  position:relative; z-index:2; text-align:center; padding:40px 20px;
}
.hero-content h1 {
  font-size:3rem; font-weight:900; color:var(--accent);
  text-shadow:0 4px 20px rgba(212,160,23,0.5);
  margin-bottom:16px;
}
.hero-content p {
  font-size:1.2rem; color:var(--text-main); max-width:700px; margin:0 auto 24px;
  line-height:1.8;
}
.hero-tags { display:flex; flex-wrap:wrap; justify-content:center; gap:10px; margin-top:16px; }
.hero-tags span {
  padding:6px 16px; border-radius:20px; font-size:0.85rem;
  background:rgba(139,0,0,0.6); color:var(--accent-light); border:1px solid var(--primary);
}

/* === 通用区块 === */
.section { padding:60px 0; }
.section-dark { background:var(--bg-dark); }
.section-alt { background:var(--bg-card); }

.section-header {
  text-align:center; margin-bottom:40px;
}
.section-header h2 {
  font-size:2rem; font-weight:900; color:var(--accent);
  position:relative; display:inline-block; padding-bottom:12px;
}
.section-header h2::after {
  content:''; position:absolute; bottom:0; left:50%; transform:translateX(-50%);
  width:60px; height:3px; background:linear-gradient(90deg,var(--primary),var(--accent));
  border-radius:2px;
}
.section-header p { color:var(--text-muted); margin-top:12px; font-size:1rem; }

/* === 视频卡片网格 === */
.video-grid {
  display:grid; grid-template-columns:repeat(3,1fr); gap:24px;
}
.video-card {
  background:var(--bg-card); border-radius:var(--radius);
  overflow:hidden; border:1px solid var(--border);
  transition:var(--transition); cursor:pointer; position:relative;
}
.video-card:hover {
  transform:translateY(-6px); border-color:var(--primary);
  box-shadow:0 12px 40px var(--shadow);
}
.video-card .thumb {
  position:relative; width:100%; padding-top:56.25%; overflow:hidden;
}
.video-card .thumb img {
  position:absolute; top:0; left:0; width:100%; height:100%;
  object-fit:cover; transition:var(--transition);
}
.video-card:hover .thumb img { transform:scale(1.08); filter:brightness(0.7); }

.video-card .play-btn {
  position:absolute; top:50%; left:50%; transform:translate(-50%,-50%) scale(0);
  width:60px; height:60px; border-radius:50%;
  background:rgba(139,0,0,0.9); border:3px solid var(--accent);
  display:flex; align-items:center; justify-content:center;
  transition:var(--transition); z-index:3;
}
.video-card .play-btn::after {
  content:''; width:0; height:0;
  border-left:18px solid var(--accent); border-top:12px solid transparent; border-bottom:12px solid transparent;
  margin-left:4px;
}
.video-card:hover .play-btn { transform:translate(-50%,-50%) scale(1); }

.video-card .card-body { padding:16px; }
.video-card .card-body h3 { font-size:1rem; font-weight:700; color:var(--text-bright); margin-bottom:8px; line-height:1.4; }
.video-card .card-body p { font-size:0.85rem; color:var(--text-muted); line-height:1.6; }
.video-card .card-meta {
  display:flex; justify-content:space-between; padding:10px 16px;
  border-top:1px solid var(--border); font-size:0.8rem; color:var(--text-muted);
}
.video-card .card-meta span { display:flex; align-items:center; gap:4px; }
.video-card .duration {
  position:absolute; bottom:8px; right:8px; background:rgba(0,0,0,0.8);
  color:#fff; padding:2px 8px; border-radius:4px; font-size:0.75rem; z-index:2;
}

/* === 模块卡片 === */
.module-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.module-card {
  background:var(--bg-card); border-radius:var(--radius); padding:28px 20px;
  text-align:center; border:1px solid var(--border); transition:var(--transition);
}
.module-card:hover { border-color:var(--accent); transform:translateY(-4px); box-shadow:0 8px 30px var(--shadow); }
.module-card .icon { font-size:2.5rem; margin-bottom:12px; }
.module-card h3 { font-size:1.1rem; font-weight:700; color:var(--accent); margin-bottom:8px; }
.module-card p { font-size:0.85rem; color:var(--text-muted); }

/* === FAQ === */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item {
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius);
  margin-bottom:12px; overflow:hidden;
}
.faq-q {
  padding:18px 24px; cursor:pointer; display:flex; justify-content:space-between; align-items:center;
  font-weight:700; color:var(--text-bright); transition:var(--transition);
}
.faq-q:hover { background:var(--bg-card-hover); }
.faq-q .arrow { transition:var(--transition); color:var(--accent); font-size:1.2rem; }
.faq-item.open .faq-q .arrow { transform:rotate(180deg); }
.faq-a { padding:0 24px; max-height:0; overflow:hidden; transition:max-height 0.4s ease; }
.faq-item.open .faq-a { max-height:300px; padding:0 24px 18px; }
.faq-a p { color:var(--text-muted); line-height:1.8; }

/* === 评论 === */
.review-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:20px; }
.review-card {
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius);
  padding:24px; transition:var(--transition);
}
.review-card:hover { border-color:var(--accent); }
.review-header { display:flex; align-items:center; gap:12px; margin-bottom:12px; }
.review-avatar {
  width:48px; height:48px; border-radius:50%; background:var(--primary);
  display:flex; align-items:center; justify-content:center;
  font-weight:900; color:var(--accent); font-size:1.2rem;
}
.review-name { font-weight:700; color:var(--text-bright); }
.review-date { font-size:0.8rem; color:var(--text-muted); }
.review-stars { color:var(--accent); margin-bottom:8px; letter-spacing:2px; }
.review-text { color:var(--text-muted); font-size:0.9rem; line-height:1.8; }

/* === 专家卡片 === */
.expert-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:24px; }
.expert-card {
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius);
  overflow:hidden; text-align:center; transition:var(--transition);
}
.expert-card:hover { border-color:var(--accent); transform:translateY(-4px); }
.expert-card img { width:100%; aspect-ratio:1; object-fit:cover; }
.expert-card .info { padding:16px; }
.expert-card h3 { font-size:1rem; font-weight:700; color:var(--accent); margin-bottom:4px; }
.expert-card .role { font-size:0.85rem; color:var(--text-muted); margin-bottom:8px; }
.expert-card .btn-sm {
  display:inline-block; padding:6px 16px; border-radius:20px; font-size:0.8rem;
  background:var(--primary); color:#fff; transition:var(--transition);
}
.expert-card .btn-sm:hover { background:var(--primary-light); }

/* === 合作品牌 === */
.brand-wall {
  display:flex; flex-wrap:wrap; justify-content:center; gap:30px; padding:20px 0;
}
.brand-wall .brand-item {
  width:120px; height:60px; background:var(--bg-card); border:1px solid var(--border);
  border-radius:8px; display:flex; align-items:center; justify-content:center;
  font-weight:700; color:var(--text-muted); font-size:0.85rem;
  transition:var(--transition);
}
.brand-wall .brand-item:hover { border-color:var(--accent); color:var(--accent); }

/* === 面包屑 === */
.breadcrumb-bar {
  background:var(--bg-card); padding:14px 0; border-bottom:1px solid var(--border);
  margin-top:68px;
}
.breadcrumb-bar .container { display:flex; align-items:center; gap:8px; font-size:0.85rem; }
.breadcrumb-bar a { color:var(--text-muted); }
.breadcrumb-bar a:hover { color:var(--accent); }
.breadcrumb-bar span.sep { color:var(--border); }
.breadcrumb-bar span.current { color:var(--accent); font-weight:500; }

/* === 内页Hero === */
.page-hero {
  position:relative; min-height:280px; display:flex; align-items:center; justify-content:center;
  overflow:hidden;
}
.page-hero img { position:absolute; top:0; left:0; width:100%; height:100%; object-fit:cover; filter:brightness(0.3); }
.page-hero .hero-text { position:relative; z-index:2; text-align:center; padding:40px 20px; }
.page-hero h1 { font-size:2.5rem; font-weight:900; color:var(--accent); margin-bottom:10px; }
.page-hero p { color:var(--text-main); font-size:1.1rem; }

/* === 内容区 === */
.content-block { padding:40px 0; }
.content-block h2 { font-size:1.6rem; font-weight:700; color:var(--accent); margin-bottom:16px; }
.content-block h3 { font-size:1.3rem; font-weight:700; color:var(--text-bright); margin:20px 0 10px; }
.content-block p { color:var(--text-muted); margin-bottom:16px; line-height:1.8; }

/* === 时间线 === */
.timeline { position:relative; padding-left:30px; }
.timeline::before {
  content:''; position:absolute; left:10px; top:0; bottom:0;
  width:2px; background:linear-gradient(180deg,var(--primary),var(--accent));
}
.timeline-item { position:relative; margin-bottom:30px; padding-left:20px; }
.timeline-item::before {
  content:''; position:absolute; left:-24px; top:6px;
  width:12px; height:12px; border-radius:50%;
  background:var(--accent); border:2px solid var(--bg-dark);
}
.timeline-item h4 { color:var(--accent); font-weight:700; margin-bottom:4px; }
.timeline-item p { color:var(--text-muted); font-size:0.9rem; }

/* === 数据统计 === */
.stats-row { display:grid; grid-template-columns:repeat(4,1fr); gap:20px; margin:30px 0; }
.stat-card {
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius);
  padding:24px; text-align:center;
}
.stat-card .num { font-size:2rem; font-weight:900; color:var(--accent); }
.stat-card .label { font-size:0.85rem; color:var(--text-muted); margin-top:4px; }

/* === 联系表单 === */
.contact-form { max-width:600px; margin:0 auto; }
.form-group { margin-bottom:16px; }
.form-group label { display:block; font-weight:500; color:var(--text-bright); margin-bottom:6px; }
.form-group input, .form-group textarea, .form-group select {
  width:100%; padding:12px 16px; border-radius:8px; border:1px solid var(--border);
  background:var(--bg-dark); color:var(--text-main); font-size:0.95rem;
  outline:none; transition:var(--transition);
}
.form-group input:focus, .form-group textarea:focus { border-color:var(--accent); }
.form-group textarea { resize:vertical; min-height:120px; }
.btn-submit {
  width:100%; padding:14px; border:none; border-radius:8px;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:#fff; font-size:1rem; font-weight:700; cursor:pointer;
  transition:var(--transition);
}
.btn-submit:hover { transform:translateY(-2px); box-shadow:0 8px 25px var(--shadow); }

/* === 社交分享 === */
.share-bar { display:flex; gap:12px; justify-content:center; padding:20px 0; }
.share-btn {
  padding:10px 20px; border-radius:25px; font-size:0.85rem; font-weight:600;
  border:1px solid var(--border); background:var(--bg-card); color:var(--text-main);
  cursor:pointer; transition:var(--transition);
}
.share-btn:hover { border-color:var(--accent); color:var(--accent); }

/* === 页脚 === */
.site-footer {
  background:var(--bg-card); border-top:2px solid var(--primary);
  padding:50px 0 20px;
}
.footer-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:30px; margin-bottom:30px; }
.footer-col h4 { font-size:1rem; font-weight:700; color:var(--accent); margin-bottom:16px; }
.footer-col a { display:block; color:var(--text-muted); font-size:0.85rem; margin-bottom:8px; }
.footer-col a:hover { color:var(--accent); }
.footer-col p { font-size:0.85rem; color:var(--text-muted); line-height:1.8; }
.footer-col img { width:120px; border-radius:8px; margin-top:8px; }

.footer-bottom {
  border-top:1px solid var(--border); padding-top:20px;
  display:flex; justify-content:space-between; align-items:center;
  font-size:0.8rem; color:var(--text-muted);
}
.footer-bottom .eeat-badges { display:flex; gap:12px; }
.footer-bottom .eeat-badges span {
  padding:4px 12px; border-radius:12px; font-size:0.75rem;
  background:rgba(139,0,0,0.3); color:var(--accent); border:1px solid var(--primary);
}

/* === 视频弹窗 === */
.modal-overlay {
  display:none; position:fixed; top:0; left:0; width:100%; height:100%;
  background:rgba(0,0,0,0.85); z-index:9999;
  justify-content:center; align-items:center;
}
.modal-overlay.active { display:flex; }
.modal-box {
  background:var(--bg-card); border-radius:var(--radius); padding:30px;
  max-width:700px; width:90%; text-align:center; position:relative;
  border:1px solid var(--accent);
}
.modal-close {
  position:absolute; top:12px; right:16px; background:none; border:none;
  color:var(--accent); font-size:1.8rem; cursor:pointer;
}
.modal-box h3 { color:var(--accent); margin-bottom:12px; }
.modal-box p { color:var(--text-muted); }

/* === 响应式 === */
@media (max-width:1024px) {
  .video-grid { grid-template-columns:repeat(2,1fr); }
  .module-grid { grid-template-columns:repeat(2,1fr); }
  .expert-grid { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:repeat(2,1fr); }
  .stats-row { grid-template-columns:repeat(2,1fr); }
}

@media (max-width:768px) {
  .main-nav { display:none; position:fixed; top:68px; left:0; width:100%; background:var(--bg-dark); flex-direction:column; padding:20px; border-bottom:1px solid var(--border); }
  .main-nav.open { display:flex; }
  .mobile-toggle { display:block; }
  .hero-content h1 { font-size:2rem; }
  .video-grid { grid-template-columns:1fr; }
  .module-grid { grid-template-columns:1fr; }
  .review-grid { grid-template-columns:1fr; }
  .expert-grid { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr; }
  .stats-row { grid-template-columns:repeat(2,1fr); }
  .footer-bottom { flex-direction:column; gap:12px; text-align:center; }
  .section { padding:40px 0; }
  .page-hero { min-height:200px; }
  .page-hero h1 { font-size:1.8rem; }
}

@media (max-width:480px) {
  .header-inner { height:56px; }
  .search-bar { margin-top:56px; }
  .breadcrumb-bar { margin-top:56px; }
  .hero-content h1 { font-size:1.5rem; }
  .section-header h2 { font-size:1.5rem; }
  .expert-grid { grid-template-columns:1fr; }
  .stats-row { grid-template-columns:1fr; }
}