/* ============================================
   91 修车改装视频社区 - 原创样式表
   品牌色系：赛车红 + 深夜蓝黑 + 改装橙
   ============================================ */

/* CSS Variables */
:root {
  --primary: #E8350F;
  --secondary: #1A1A2E;
  --accent: #FF6B35;
  --bg-dark: #0D0D1A;
  --bg-card: #16162A;
  --text-light: #F0F0F0;
  --text-muted: #A0A0B8;
  --border: #2A2A4A;
  --gradient-red: linear-gradient(135deg, #E8350F 0%, #FF6B35 100%);
  --gradient-dark: linear-gradient(180deg, #0D0D1A 0%, #1A1A2E 100%);
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --radius: 12px;
  --transition: all 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; }

/* Container */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 70px 0; }
.section-title {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 15px;
  background: var(--gradient-red);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 50px;
  font-size: 1rem;
}

/* Header / Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(13,13,26,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo img { height: 45px; width: auto; }
.logo-text { font-size: 1.5rem; font-weight: 800; color: var(--primary); }
.nav-menu { display: flex; gap: 28px; align-items: center; }
.nav-menu a {
  color: var(--text-light);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 5px 0;
}
.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}
.nav-menu a:hover::after, .nav-menu a.active::after { width: 100%; }
.nav-menu a:hover { color: var(--primary); }

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 5px;
}
.menu-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--text-light);
  transition: var(--transition);
}

/* Search Bar */
.search-bar {
  background: var(--secondary);
  padding: 15px 0;
  border-bottom: 1px solid var(--border);
  margin-top: 70px;
}
.search-wrapper {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  gap: 10px;
  padding: 0 20px;
}
.search-wrapper input {
  flex: 1;
  padding: 12px 20px;
  border: 1px solid var(--border);
  border-radius: 50px;
  background: var(--bg-card);
  color: var(--text-light);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}
.search-wrapper input:focus { border-color: var(--primary); }
.search-wrapper input::placeholder { color: var(--text-muted); }
.search-btn {
  padding: 12px 28px;
  background: var(--gradient-red);
  color: #fff;
  border: none;
  border-radius: 50px;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}
.search-btn:hover { transform: scale(1.05); box-shadow: 0 4px 20px rgba(232,53,15,0.4); }

/* Hero Banner */
.hero-banner {
  position: relative;
  height: 520px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-banner .hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.45);
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 20px;
}
.hero-content h1 {
  font-size: 3rem;
  margin-bottom: 18px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.6);
}
.hero-content h1 span { color: var(--primary); }
.hero-content p {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 30px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 15px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  display: inline-block;
  padding: 14px 36px;
  background: var(--gradient-red);
  color: #fff;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 25px rgba(232,53,15,0.5); color: #fff; }
.btn-outline {
  display: inline-block;
  padding: 14px 36px;
  border: 2px solid var(--primary);
  color: var(--primary);
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  background: transparent;
  transition: var(--transition);
}
.btn-outline:hover { background: var(--primary); color: #fff; }

/* Video Card Grid */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--primary); }
.video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
}
.video-thumb img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 60px;
  height: 60px;
  background: rgba(232,53,15,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 3;
}
.play-btn::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-card:hover .play-btn { transform: translate(-50%, -50%) scale(1); }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  z-index: 3;
}
.video-info { padding: 16px; }
.video-info h4 {
  font-size: 0.95rem;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}
.video-meta {
  display: flex;
  gap: 15px;
  color: var(--text-muted);
  font-size: 0.82rem;
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tags { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.video-tags span {
  padding: 3px 10px;
  background: rgba(232,53,15,0.15);
  color: var(--primary);
  border-radius: 20px;
  font-size: 0.75rem;
}

/* Short Video Grid (TikTok style) */
.short-video-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.short-card {
  position: relative;
  padding-top: 177%;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
}
.short-card img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}
.short-card:hover img { transform: scale(1.05); filter: brightness(0.7); }
.short-card .play-btn {
  width: 50px;
  height: 50px;
}
.short-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 15px;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
  z-index: 2;
}
.short-overlay h5 { font-size: 0.85rem; margin-bottom: 5px; }
.short-overlay .views { font-size: 0.75rem; color: var(--text-muted); }

/* Expert Cards */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 30px 20px;
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.expert-card:hover { border-color: var(--primary); transform: translateY(-5px); box-shadow: var(--shadow); }
.expert-avatar {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  margin: 0 auto 18px;
  overflow: hidden;
  border: 3px solid var(--primary);
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.expert-card h4 { font-size: 1.1rem; margin-bottom: 6px; }
.expert-card .role { color: var(--accent); font-size: 0.88rem; margin-bottom: 12px; }
.expert-card p { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 18px; line-height: 1.6; }
.expert-links { display: flex; gap: 10px; justify-content: center; }
.expert-links a {
  padding: 8px 18px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.82rem;
  color: var(--text-light);
}
.expert-links a:hover { border-color: var(--primary); color: var(--primary); }

/* Brand Logo Wall */
.56h326t4 {
  display: flex;
  gap: 40px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  padding: 30px 0;
}
.esyv8o9s {
  width: 140px;
  height: 70px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  transition: var(--transition);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.9rem;
}
.esyv8o9s:hover { border-color: var(--primary); background: rgba(232,53,15,0.08); }

/* AI Section */
.zjs7x {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.1aze192 {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 35px 25px;
  border: 1px solid var(--border);
  transition: var(--transition);
  text-align: center;
}
.1aze192:hover { border-color: var(--accent); transform: translateY(-4px); }
.s7mkk2 {
  width: 70px;
  height: 70px;
  margin: 0 auto 20px;
  background: var(--gradient-red);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}
.1aze192 h4 { margin-bottom: 12px; font-size: 1.1rem; }
.1aze192 p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; }

/* FAQ Section */
.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: 14px;
  overflow: hidden;
}
.faq-question {
  padding: 20px 25px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-arrow {
  font-size: 1.2rem;
  transition: var(--transition);
  color: var(--primary);
}
.faq-item.active .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  padding: 0 25px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.8;
}
.faq-item.active .faq-answer { max-height: 300px; padding: 0 25px 20px; }

/* Reviews */
.review-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
}
.review-card:hover { border-color: var(--accent); }
.review-header { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-red);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-weight: 600; }
.review-stars { color: #FFD700; font-size: 0.9rem; }
.review-text { color: var(--text-muted); font-size: 0.92rem; line-height: 1.7; }

/* Contact Section */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}
.contact-info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 35px;
}
.contact-info-card h4 { font-size: 1.2rem; margin-bottom: 20px; color: var(--primary); }
.contact-item { display: flex; gap: 12px; margin-bottom: 16px; align-items: flex-start; }
.contact-label { color: var(--text-muted); min-width: 80px; font-size: 0.9rem; }
.contact-value { font-size: 0.95rem; }

/* Community Guide */
.ieibo0 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.v8mt0x1 {
  text-align: center;
  padding: 30px 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  position: relative;
}
.cbb96s9 {
  width: 50px;
  height: 50px;
  background: var(--gradient-red);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 800;
  margin: 0 auto 15px;
  color: #fff;
}
.v8mt0x1 h5 { margin-bottom: 10px; font-size: 1rem; }
.v8mt0x1 p { color: var(--text-muted); font-size: 0.85rem; }

/* Share Buttons */
.lz6kc {
  display: flex;
  gap: 12px;
  justify-content: center;
  padding: 20px 0;
}
.qwbcv6u {
  padding: 10px 22px;
  border-radius: 25px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  color: #fff;
  transition: var(--transition);
}
.qwbcv6u:hover { transform: scale(1.05); }
.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #161823; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; }

/* Footer */
.site-footer {
  background: var(--secondary);
  border-top: 1px solid var(--border);
  padding: 50px 0 25px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo { margin-bottom: 15px; }
.footer-brand p { color: var(--text-muted); font-size: 0.88rem; line-height: 1.7; }
.footer-col h5 {
  font-size: 1rem;
  margin-bottom: 18px;
  color: var(--text-light);
  position: relative;
  padding-bottom: 10px;
}
.footer-col h5::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--primary);
}
.footer-col a {
  display: block;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 10px;
}
.footer-col a:hover { color: var(--primary); }
.footer-qr { display: flex; gap: 20px; margin-top: 15px; }
.footer-qr img { width: 100px; height: 100px; border-radius: 8px; }
.footer-bottom {
  text-align: center;
  padding-top: 25px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }

/* Breadcrumb */
.breadcrumb {
  padding: 15px 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 8px; }

/* Page Header for Inner Pages */
.page-header {
  background: var(--secondary);
  padding: 100px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.page-header h1 { font-size: 2.2rem; margin-bottom: 10px; }
.page-header p { color: var(--text-muted); }

/* Sidebar Modules for Inner Pages */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 30px;
  padding: 40px 0;
}
.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}
.sidebar-widget h4 {
  font-size: 1.05rem;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.sidebar-video-item {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(42,42,74,0.5);
}
.sidebar-video-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.sidebar-video-thumb {
  width: 100px;
  height: 60px;
  border-radius: 6px;
  overflow: hidden;
  flex-shrink: 0;
  position: relative;
}
.sidebar-video-thumb img { width: 100%; height: 100%; object-fit: cover; }
.sidebar-video-info h5 { font-size: 0.85rem; margin-bottom: 4px; line-height: 1.3; }
.sidebar-video-info span { font-size: 0.78rem; color: var(--text-muted); }

/* MCP Frontend Code Block */
.7o75k1sm {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 20px;
}
.7o75k1sm pre {
  background: #0a0a15;
  padding: 15px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.82rem;
  color: #7fdbca;
  line-height: 1.6;
}

/* Responsive */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .short-video-grid { grid-template-columns: repeat(3, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .ieibo0 { grid-template-columns: repeat(2, 1fr); }
  .page-layout { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav-menu { 
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background: rgba(13,13,26,0.98);
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    border-bottom: 1px solid var(--border);
  }
  .nav-menu.active { display: flex; }
  .menu-toggle { display: flex; }
  .hero-banner { height: 400px; }
  .hero-content h1 { font-size: 2rem; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .short-video-grid { grid-template-columns: repeat(2, 1fr); }
  .zjs7x { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 1.6rem; }
  .section { padding: 50px 0; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .short-video-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-banner { height: 320px; }
  .hero-content h1 { font-size: 1.6rem; }
  .hero-btns { flex-direction: column; align-items: center; }
  .ieibo0 { grid-template-columns: 1fr; }
}

/* Lazy Load Placeholder */
.lazy { opacity: 0; transition: opacity 0.5s ease; }
.lazy.loaded { opacity: 1; }

/* Animation */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.6s ease forwards; }

/* Update Time */
.update-time {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-top: 10px;
}

/* Fix: Short video card hover play button */
.short-card:hover .play-btn { transform: translate(-50%, -50%) scale(1); }

/* Expert certification badge */
.3zyai2 {
  color: var(--accent);
  font-size: 0.82rem;
  margin-bottom: 12px;
  padding: 4px 12px;
  background: rgba(255,107,53,0.1);
  border-radius: 20px;
  display: inline-block;
}

/* Section dark variant */
.3tyg7b2 { background: var(--secondary); }

/* AI grid 4 columns for homepage */
.zjs7x-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
@media (max-width: 1024px) {
  .zjs7x-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .zjs7x-4 { grid-template-columns: 1fr; }
}

/* Review grid 4 columns */
.review-grid-4 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
@media (max-width: 768px) {
  .review-grid-4 { grid-template-columns: 1fr; }
}