/* 寻欢 修车改装视频社区 - 全站样式 */
/* 原创配色：深海蓝 #0a1628 | 钛金灰 #1e2a3a | 赛道橙 #e8651a | 铬银 #c0c8d4 | 纯白 #ffffff */

:root {
  --deep-blue: #0a1628;
  --titanium: #1e2a3a;
  --racing-orange: #e8651a;
  --chrome-silver: #c0c8d4;
  --white: #ffffff;
  --light-bg: #f4f6f9;
  --text-primary: #e8ecf1;
  --text-secondary: #8a95a5;
  --card-bg: #152238;
  --border-color: #2a3a52;
  --success: #22c55e;
  --gradient-main: linear-gradient(135deg, #0a1628 0%, #1e2a3a 100%);
  --gradient-accent: linear-gradient(135deg, #e8651a 0%, #f59e0b 100%);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--deep-blue);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--racing-orange); text-decoration: none; transition: color .3s; }
a:hover { color: #f59e0b; }

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

.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }

/* ===== 头部导航 ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background .3s;
}

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1280px; margin: 0 auto; padding: 0 20px; height: 68px;
}

.logo-wrap { display: flex; align-items: center; gap: 10px; }
.logo-wrap img { height: 42px; width: auto; }
.logo-text { font-size: 1.5rem; font-weight: 800; color: var(--white); letter-spacing: 2px; }
.logo-text span { color: var(--racing-orange); }

.main-nav { display: flex; align-items: center; gap: 0; }
.main-nav a {
  display: block; padding: 0 16px; height: 68px; line-height: 68px;
  color: var(--chrome-silver); font-size: .95rem; font-weight: 500;
  position: relative; transition: color .3s;
}
.main-nav a:hover, .main-nav a.active { color: var(--racing-orange); }
.main-nav a::after {
  content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 0; height: 3px; background: var(--racing-orange);
  border-radius: 2px; transition: width .3s;
}
.main-nav a:hover::after, .main-nav a.active::after { width: 60%; }

.mobile-toggle { display: none; cursor: pointer; padding: 8px; }
.mobile-toggle span { display: block; width: 24px; height: 2px; background: var(--white); margin: 6px 0; transition: .3s; }

/* ===== 搜索框 ===== */
.search-bar {
  background: var(--titanium); padding: 14px 0;
  border-bottom: 1px solid var(--border-color);
  margin-top: 68px;
}
.search-bar .container { display: flex; justify-content: center; }
.search-form {
  display: flex; max-width: 640px; width: 100%;
  border: 2px solid var(--border-color); border-radius: 50px;
  overflow: hidden; transition: border-color .3s;
}
.search-form:focus-within { border-color: var(--racing-orange); }
.search-form input {
  flex: 1; padding: 12px 24px; background: transparent;
  border: none; color: var(--text-primary); font-size: .95rem; outline: none;
}
.search-form input::placeholder { color: var(--text-secondary); }
.search-form button {
  padding: 12px 28px; background: var(--gradient-accent);
  border: none; color: var(--white); font-size: .95rem; font-weight: 600;
  cursor: pointer; transition: opacity .3s;
}
.search-form button:hover { opacity: .85; }

/* ===== Banner ===== */
.hero-banner {
  position: relative; min-height: 520px; display: flex; align-items: center;
  overflow: hidden;
}
.hero-banner .bg-img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; filter: brightness(.45);
}
.hero-content {
  position: relative; z-index: 2; max-width: 720px;
  padding: 80px 20px 60px;
}
.hero-content h1 {
  font-size: 2.6rem; font-weight: 800; line-height: 1.3;
  margin-bottom: 18px;
}
.hero-content h1 .brand { color: var(--racing-orange); }
.hero-content p { font-size: 1.1rem; color: var(--chrome-silver); margin-bottom: 28px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  display: inline-block; padding: 14px 32px; background: var(--gradient-accent);
  color: var(--white); font-weight: 600; border-radius: 50px;
  border: none; cursor: pointer; font-size: 1rem; transition: transform .3s, box-shadow .3s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,101,26,.35); color: var(--white); }
.btn-outline {
  display: inline-block; padding: 14px 32px;
  border: 2px solid var(--racing-orange); color: var(--racing-orange);
  font-weight: 600; border-radius: 50px; font-size: 1rem;
  transition: background .3s, color .3s;
}
.btn-outline:hover { background: var(--racing-orange); color: var(--white); }

/* ===== 通用区块 ===== */
.section { padding: 70px 0; }
.section-alt { background: var(--titanium); }
.section-light { background: var(--light-bg); color: #1a1a2e; }
.section-title {
  text-align: center; margin-bottom: 50px;
}
.section-title h2 {
  font-size: 2rem; font-weight: 700; margin-bottom: 12px;
}
.section-title h2 .brand { color: var(--racing-orange); }
.section-title p { color: var(--text-secondary); font-size: 1.05rem; max-width: 680px; margin: 0 auto; }

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--card-bg); border-radius: 12px; overflow: hidden;
  border: 1px solid var(--border-color);
  transition: transform .3s, box-shadow .3s;
}
.video-card:hover { transform: translateY(-6px); box-shadow: 0 12px 36px rgba(0,0,0,.4); }
.video-thumb {
  position: relative; padding-top: 56.25%; overflow: hidden;
}
.video-thumb img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  transition: transform .4s;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 60px; height: 60px; background: rgba(232,101,26,.85);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity .3s;
  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 var(--white);
  margin-left: 3px;
}
.video-card:hover .play-btn { opacity: 1; }
.video-duration {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,.75); color: var(--white);
  padding: 2px 8px; border-radius: 4px; font-size: .8rem;
}
.video-info { padding: 16px; }
.video-info h3 { font-size: 1rem; font-weight: 600; margin-bottom: 8px; line-height: 1.4; }
.video-meta { display: flex; gap: 16px; color: var(--text-secondary); font-size: .85rem; }
.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(232,101,26,.15); color: var(--racing-orange);
  border-radius: 20px; font-size: .78rem;
}

/* ===== 专家卡片 ===== */
.expert-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--card-bg); border-radius: 12px; padding: 30px;
  text-align: center; border: 1px solid var(--border-color);
  transition: transform .3s;
}
.expert-card:hover { transform: translateY(-4px); }
.expert-card img {
  width: 100px; height: 100px; border-radius: 50%;
  object-fit: cover; margin: 0 auto 16px;
  border: 3px solid var(--racing-orange);
}
.expert-card h3 { font-size: 1.1rem; margin-bottom: 6px; }
.expert-card .role { color: var(--racing-orange); font-size: .9rem; margin-bottom: 10px; }
.expert-card p { color: var(--text-secondary); font-size: .9rem; margin-bottom: 16px; }
.expert-links { display: flex; gap: 10px; justify-content: center; }
.expert-links a {
  padding: 8px 18px; border: 1px solid var(--border-color);
  border-radius: 20px; font-size: .85rem; color: var(--chrome-silver);
  transition: all .3s;
}
.expert-links a:hover { border-color: var(--racing-orange); color: var(--racing-orange); }

/* ===== AI赋能 ===== */
.ai-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.ai-card {
  background: var(--card-bg); border-radius: 12px; padding: 30px;
  border: 1px solid var(--border-color); transition: transform .3s;
}
.ai-card:hover { transform: translateY(-4px); }
.ai-icon {
  width: 56px; height: 56px; background: var(--gradient-accent);
  border-radius: 14px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px; font-size: 1.5rem;
}
.ai-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.ai-card p { color: var(--text-secondary); font-size: .92rem; }

/* ===== 品牌墙 ===== */
.brand-wall {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 30px; align-items: center;
}
.brand-wall-item {
  background: var(--card-bg); border: 1px solid var(--border-color);
  border-radius: 10px; padding: 20px 30px;
  font-size: 1.1rem; font-weight: 700; color: var(--chrome-silver);
  transition: all .3s;
}
.brand-wall-item:hover { border-color: var(--racing-orange); color: var(--racing-orange); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--card-bg); border: 1px solid var(--border-color);
  border-radius: 10px; margin-bottom: 12px; overflow: hidden;
}
.faq-q {
  padding: 18px 24px; cursor: pointer; display: flex;
  justify-content: space-between; align-items: center;
  font-weight: 600; font-size: 1rem; transition: color .3s;
}
.faq-q:hover { color: var(--racing-orange); }
.faq-q::after { content: '+'; font-size: 1.4rem; color: var(--racing-orange); transition: transform .3s; }
.faq-item.active .faq-q::after { transform: rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden; transition: max-height .4s ease, padding .4s;
  padding: 0 24px; color: var(--text-secondary); font-size: .95rem; line-height: 1.8;
}
.faq-item.active .faq-a { max-height: 300px; padding: 0 24px 18px; }

/* ===== 用户评论 ===== */
.review-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--card-bg); border-radius: 12px; padding: 24px;
  border: 1px solid var(--border-color);
}
.review-stars { color: #f59e0b; margin-bottom: 12px; font-size: 1.1rem; letter-spacing: 2px; }
.review-card p { color: var(--text-secondary); font-size: .95rem; margin-bottom: 14px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--gradient-accent); display: flex;
  align-items: center; justify-content: center;
  color: var(--white); font-weight: 700; font-size: .9rem;
}
.review-name { font-weight: 600; font-size: .9rem; }
.review-date { color: var(--text-secondary); font-size: .8rem; }

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.contact-card {
  background: var(--card-bg); border-radius: 12px; padding: 28px;
  border: 1px solid var(--border-color); text-align: center;
}
.contact-card h3 { font-size: 1.05rem; margin-bottom: 12px; color: var(--racing-orange); }
.contact-card p { color: var(--text-secondary); font-size: .92rem; line-height: 1.8; }

/* ===== 社交分享 ===== */
.share-bar {
  display: flex; justify-content: center; gap: 14px;
  padding: 20px 0; flex-wrap: wrap;
}
.share-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: 50px;
  font-size: .9rem; font-weight: 500; color: var(--white);
  transition: transform .3s, opacity .3s;
}
.share-btn:hover { transform: translateY(-2px); opacity: .85; color: var(--white); }
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #161823; border: 1px solid #444; }
.share-bilibili { background: #00a1d6; }

/* ===== 页脚 ===== */
.site-footer {
  background: #060e1a; border-top: 1px solid var(--border-color);
  padding: 50px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 30px; margin-bottom: 40px;
}
.footer-col h4 {
  font-size: 1rem; font-weight: 700; margin-bottom: 16px;
  color: var(--racing-orange);
}
.footer-col p, .footer-col a {
  color: var(--text-secondary); font-size: .9rem; line-height: 2;
  display: block;
}
.footer-col a:hover { color: var(--racing-orange); }
.footer-qr { display: flex; gap: 20px; margin-top: 10px; }
.footer-qr img { width: 110px; height: 110px; border-radius: 8px; }
.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 20px 0; text-align: center;
  color: var(--text-secondary); font-size: .85rem;
}

/* ===== How-To 指南 ===== */
.howto-steps {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px; counter-reset: step;
}
.howto-step {
  background: var(--card-bg); border-radius: 12px; padding: 28px;
  border: 1px solid var(--border-color); position: relative;
  counter-increment: step;
}
.howto-step::before {
  content: counter(step); position: absolute; top: -14px; left: 24px;
  width: 32px; height: 32px; background: var(--gradient-accent);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: .9rem; color: var(--white);
}
.howto-step h3 { font-size: 1rem; margin-bottom: 8px; margin-top: 6px; }
.howto-step p { color: var(--text-secondary); font-size: .9rem; }

/* ===== 社区模块 ===== */
.community-tabs { display: flex; gap: 10px; justify-content: center; margin-bottom: 30px; flex-wrap: wrap; }
.community-tab {
  padding: 10px 22px; border: 1px solid var(--border-color);
  border-radius: 50px; color: var(--chrome-silver); font-size: .9rem;
  cursor: pointer; transition: all .3s;
}
.community-tab:hover, .community-tab.active {
  background: var(--racing-orange); border-color: var(--racing-orange); color: var(--white);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 14px 0; font-size: .88rem; color: var(--text-secondary);
  margin-top: 68px;
}
.breadcrumb a { color: var(--chrome-silver); }
.breadcrumb a:hover { color: var(--racing-orange); }
.breadcrumb span { margin: 0 8px; }

/* ===== 内页标题 ===== */
.page-hero {
  position: relative; min-height: 300px; display: flex; align-items: center;
  overflow: hidden;
}
.page-hero .bg-img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; filter: brightness(.35);
}
.page-hero-content {
  position: relative; z-index: 2; padding: 40px 20px;
}
.page-hero-content h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 12px; }
.page-hero-content p { color: var(--chrome-silver); font-size: 1.05rem; }

/* ===== 懒加载 ===== */
.lazy { opacity: 1; transition: opacity .5s; }
.lazy.loaded { opacity: 1; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .main-nav { 
    display: none; position: fixed; top: 68px; left: 0; right: 0;
    background: var(--deep-blue); flex-direction: column;
    border-bottom: 1px solid var(--border-color);
    padding: 10px 0;
  }
  .main-nav.show { display: flex; }
  .main-nav a { height: auto; line-height: 2.5; padding: 0 20px; }
  .mobile-toggle { display: block; }
  .hero-content h1 { font-size: 1.8rem; }
  .hero-content { padding: 40px 20px; }
  .hero-banner { min-height: 400px; }
  .section { padding: 40px 0; }
  .section-title h2 { font-size: 1.5rem; }
  .video-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .search-form { max-width: 100%; }
  .page-hero { min-height: 200px; }
  .page-hero-content h1 { font-size: 1.6rem; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.5rem; }
  .btn-primary, .btn-outline { padding: 12px 24px; font-size: .9rem; }
  .header-inner { padding: 0 12px; }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp .6s ease forwards; }

/* ===== MCP前端占位 ===== */
.mcp-widget {
  background: var(--card-bg); border: 1px dashed var(--border-color);
  border-radius: 12px; padding: 24px; text-align: center;
  color: var(--text-secondary); font-size: .9rem;
}