/* ============================================
   91 修车改装视频社区 - 原创样式表
   配色：赛车红 #E63946 / 深海蓝 #1D3557 / 琥珀橙 #F4A261
   背景：暗夜黑 #0A0E17 / 卡片 #141B2D
   ============================================ */

/* === 基础重置 === */
*,*::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:#0A0E17;color:#E8E8E8;line-height:1.7;overflow-x:hidden}
a{color:#F4A261;text-decoration:none;transition:color .3s}
a:hover{color:#E63946}
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;color:#fff}

/* === 容器 === */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:60px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;color:#fff;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:"";display:block;width:60px;height:3px;background:linear-gradient(90deg,#E63946,#F4A261);margin:12px auto 0}
.section-title p{color:#8892A4;font-size:1rem;max-width:600px;margin:0 auto}

/* === 顶部导航 === */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(10,14,23,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(230,57,70,.15);transition:background .3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;max-width:1200px;margin:0 auto;padding:0 20px}
.logo{display:flex;align-items:center;gap:10px}
.logo img{height:42px;width:auto}
.logo span{font-size:1.4rem;font-weight:800;color:#E63946;letter-spacing:1px}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{padding:8px 14px;font-size:.9rem;color:#E8E8E8;border-radius:6px;transition:all .3s}
.main-nav a:hover,.main-nav a.active{color:#E63946;background:rgba(230,57,70,.1)}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:2px;background:#E8E8E8;transition:all .3s}

/* === 搜索框 === */
.search-bar{background:#111827;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.05)}
.search-bar .container{display:flex;justify-content:center}
.search-wrap{position:relative;width:100%;max-width:560px}
.search-wrap input{width:100%;padding:10px 44px 10px 18px;border:1px solid rgba(230,57,70,.3);border-radius:24px;background:#1a2236;color:#E8E8E8;font-size:.95rem;outline:none;transition:border-color .3s}
.search-wrap input:focus{border-color:#E63946}
.search-wrap input::placeholder{color:#8892A4}
.search-wrap button{position:absolute;right:4px;top:50%;transform:translateY(-50%);background:#E63946;border:none;color:#fff;width:36px;height:36px;border-radius:50%;cursor:pointer;font-size:1rem;transition:background .3s}
.search-wrap button:hover{background:#c62d3a}

/* === Hero Banner === */
.hero-banner{position:relative;margin-top:68px;height:520px;overflow:hidden}
.hero-banner .hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.55)}
.hero-banner .hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,14,23,.3) 0%,rgba(10,14,23,.85) 100%)}
.hero-content{position:relative;z-index:2;height:100%;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:0 20px}
.hero-content h1{font-size:2.8rem;margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.hero-content h1 .brand{color:#E63946}
.hero-content p{font-size:1.15rem;color:#ccc;max-width:680px;margin-bottom:28px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s;border:none}
.btn-primary{background:linear-gradient(135deg,#E63946,#c62d3a);color:#fff;box-shadow:0 4px 20px rgba(230,57,70,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 28px rgba(230,57,70,.5);color:#fff}
.btn-outline{background:transparent;color:#F4A261;border:2px solid #F4A261}
.btn-outline:hover{background:#F4A261;color:#0A0E17}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:24px}
.video-card{background:#141B2D;border-radius:12px;overflow:hidden;transition:transform .3s,box-shadow .3s;border:1px solid rgba(255,255,255,.05)}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(230,57,70,.15)}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;cursor:pointer}
.video-thumb img{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:56px;height:56px;background:rgba(230,57,70,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;pointer-events:none}
.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:3px}
.video-card:hover .play-btn{opacity:1}
.video-info{padding:16px}
.video-info h3{font-size:1.05rem;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:16px;color:#8892A4;font-size:.85rem}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;padding:3px 10px;background:rgba(230,57,70,.15);color:#E63946;border-radius:4px;font-size:.78rem;margin-top:8px}

/* === 统计数据条 === */
.stats-bar{background:linear-gradient(135deg,#1D3557,#0f2240);padding:40px 0;border-top:1px solid rgba(230,57,70,.2);border-bottom:1px solid rgba(230,57,70,.2)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-item .stat-num{font-size:2.4rem;font-weight:800;color:#E63946;display:block}
.stat-item .stat-label{color:#8892A4;font-size:.9rem;margin-top:4px}

/* === 分类标签栏 === */
.tag-bar{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-bottom:30px}
.tag-bar a{padding:8px 20px;border-radius:20px;background:#1a2236;color:#8892A4;font-size:.9rem;border:1px solid rgba(255,255,255,.08);transition:all .3s}
.tag-bar a:hover,.tag-bar a.active{background:#E63946;color:#fff;border-color:#E63946}

/* === AI赋能模块 === */
.ai-section{background:linear-gradient(180deg,#0A0E17 0%,#0f1a2e 50%,#0A0E17 100%)}
.ai-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.ai-card{background:#141B2D;border-radius:12px;padding:28px;border:1px solid rgba(244,162,97,.1);transition:all .3s}
.ai-card:hover{border-color:#F4A261;box-shadow:0 0 30px rgba(244,162,97,.1)}
.ai-card .ai-icon{width:52px;height:52px;background:linear-gradient(135deg,#E63946,#F4A261);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:16px}
.ai-card h4{font-size:1.1rem;margin-bottom:10px;color:#F4A261}
.ai-card p{color:#8892A4;font-size:.92rem}

/* === 团队展示 === */
.team-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:28px}
.team-card{background:#141B2D;border-radius:12px;padding:24px;text-align:center;border:1px solid rgba(255,255,255,.05);transition:all .3s}
.team-card:hover{border-color:#E63946;transform:translateY(-4px)}
.team-card .avatar{width:100px;height:100px;border-radius:50%;margin:0 auto 16px;overflow:hidden;border:3px solid #E63946}
.team-card .avatar img{width:100%;height:100%;object-fit:cover}
.team-card h4{font-size:1.1rem;margin-bottom:4px}
.team-card .role{color:#F4A261;font-size:.88rem;margin-bottom:12px}
.team-card p{color:#8892A4;font-size:.88rem;margin-bottom:16px}
.team-card .team-links{display:flex;gap:10px;justify-content:center}
.team-card .team-links a{padding:6px 16px;border-radius:6px;font-size:.82rem;border:1px solid #E63946;color:#E63946;transition:all .3s}
.team-card .team-links a:hover{background:#E63946;color:#fff}

/* === FAQ 手风琴 === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#141B2D;border-radius:10px;margin-bottom:12px;border:1px solid rgba(255,255,255,.05);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:background .3s}
.faq-q:hover{background:rgba(230,57,70,.05)}
.faq-q::after{content:"+";font-size:1.4rem;color:#E63946;transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px}
.faq-item.open .faq-a{max-height:300px;padding:0 24px 18px}
.faq-a p{color:#8892A4;font-size:.92rem;line-height:1.8}

/* === 用户评论 === */
.reviews-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.review-card{background:#141B2D;border-radius:12px;padding:24px;border:1px solid rgba(255,255,255,.05)}
.review-card .stars{color:#F4A261;font-size:1rem;margin-bottom:10px;letter-spacing:2px}
.review-card .review-text{color:#ccc;font-size:.92rem;margin-bottom:14px;font-style:italic;line-height:1.7}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer .r-avatar{width:36px;height:36px;border-radius:50%;background:#1D3557;display:flex;align-items:center;justify-content:center;color:#E63946;font-weight:700;font-size:.9rem}
.review-card .reviewer .r-info .r-name{font-size:.88rem;font-weight:600}
.review-card .reviewer .r-info .r-date{font-size:.78rem;color:#8892A4}

/* === 合作品牌墙 === */
.brand-wall{display:flex;flex-wrap:wrap;gap:24px;justify-content:center;align-items:center}
.brand-wall .brand-item{background:#141B2D;border-radius:10px;padding:20px 32px;border:1px solid rgba(255,255,255,.05);color:#8892A4;font-size:1rem;font-weight:600;transition:all .3s}
.brand-wall .brand-item:hover{border-color:#F4A261;color:#F4A261}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:28px}
.contact-card{background:#141B2D;border-radius:12px;padding:28px;border:1px solid rgba(255,255,255,.05)}
.contact-card h4{color:#F4A261;margin-bottom:16px;font-size:1.1rem}
.contact-card p{color:#8892A4;font-size:.92rem;margin-bottom:8px}
.contact-card .qr-img{width:180px;margin:16px auto 0;border-radius:8px;overflow:hidden}

/* === 社交分享 === */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;padding:20px 0}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:8px;font-size:.88rem;font-weight:600;color:#fff;transition:all .3s;cursor:pointer;border:none}
.share-btn.wechat{background:#07C160}
.share-btn.weibo{background:#E6162D}
.share-btn.douyin{background:#161823}
.share-btn.bilibili{background:#00A1D6}
.share-btn:hover{transform:translateY(-2px);opacity:.9}

/* === 页脚 === */
.site-footer{background:#080c15;border-top:1px solid rgba(230,57,70,.15);padding:48px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
.footer-col h5{color:#fff;font-size:1rem;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-col h5::after{content:"";position:absolute;bottom:0;left:0;width:30px;height:2px;background:#E63946}
.footer-col p,.footer-col a{color:#8892A4;font-size:.88rem;display:block;margin-bottom:8px}
.footer-col a:hover{color:#E63946}
.footer-col .footer-logo{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.footer-col .footer-logo img{height:36px}
.footer-col .footer-logo span{font-size:1.2rem;font-weight:800;color:#E63946}
.footer-qr{display:flex;gap:16px;margin-top:12px}
.footer-qr .qr-box{text-align:center}
.footer-qr .qr-box img{width:120px;border-radius:6px;margin-bottom:6px}
.footer-qr .qr-box span{font-size:.78rem;color:#8892A4}
.footer-bottom{border-top:1px solid rgba(255,255,255,.05);padding:20px 0;text-align:center;color:#8892A4;font-size:.82rem}
.footer-bottom .update-time{margin-top:6px;color:#666}

/* === 面包屑 === */
.breadcrumb{padding:16px 0;font-size:.88rem;color:#8892A4}
.breadcrumb a{color:#F4A261}
.breadcrumb span{margin:0 8px;color:#555}

/* === 内页通用头部 === */
.page-hero{margin-top:68px;padding:60px 0 40px;background:linear-gradient(180deg,#111827,#0A0E17);text-align:center}
.page-hero h1{font-size:2.2rem;margin-bottom:10px}
.page-hero p{color:#8892A4;max-width:600px;margin:0 auto}

/* === How-To 指南 === */
.howto-steps{max-width:700px;margin:0 auto}
.howto-step{display:flex;gap:20px;margin-bottom:28px;align-items:flex-start}
.howto-step .step-num{flex-shrink:0;width:44px;height:44px;background:linear-gradient(135deg,#E63946,#F4A261);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.1rem;color:#fff}
.howto-step .step-content h4{font-size:1rem;margin-bottom:6px}
.howto-step .step-content p{color:#8892A4;font-size:.92rem}

/* === 社区话题卡片 === */
.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.topic-card{background:#141B2D;border-radius:10px;padding:20px;border-left:3px solid #E63946;transition:all .3s}
.topic-card:hover{background:#1a2236}
.topic-card h4{font-size:1rem;margin-bottom:8px}
.topic-card .topic-meta{color:#8892A4;font-size:.82rem;display:flex;gap:16px}

/* === 配件列表 === */
.parts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.part-card{background:#141B2D;border-radius:12px;overflow:hidden;border:1px solid rgba(255,255,255,.05);transition:all .3s}
.part-card:hover{border-color:#F4A261;transform:translateY(-4px)}
.part-card .part-img{aspect-ratio:4/3;overflow:hidden}
.part-card .part-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.part-card:hover .part-img img{transform:scale(1.05)}
.part-card .part-info{padding:16px}
.part-card .part-info h4{font-size:1rem;margin-bottom:6px}
.part-card .part-info .price{color:#E63946;font-weight:700;font-size:1.1rem}
.part-card .part-info p{color:#8892A4;font-size:.85rem;margin-top:6px}

/* === MCP 服务前端占位 === */
.mcp-widget{background:#141B2D;border-radius:12px;padding:24px;border:1px dashed rgba(244,162,97,.3);text-align:center;margin-top:20px}
.mcp-widget p{color:#8892A4;font-size:.88rem}

/* === 响应式 === */
@media(max-width:992px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .hero-content h1{font-size:2rem}
}
@media(max-width:768px){
  .main-nav{position:fixed;top:68px;right:-100%;width:260px;height:calc(100vh - 68px);background:#0A0E17;flex-direction:column;padding:20px;gap:4px;transition:right .3s;border-left:1px solid rgba(230,57,70,.15)}
  .main-nav.open{right:0}
  .main-nav a{padding:12px 16px;width:100%}
  .nav-toggle{display:flex}
  .hero-banner{height:400px}
  .hero-content h1{font-size:1.6rem}
  .video-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .section{padding:40px 0}
  .section-title h2{font-size:1.5rem}
  .stats-grid{grid-template-columns:1fr 1fr}
  .team-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .hero-banner{height:320px}
  .hero-content h1{font-size:1.3rem}
  .hero-btns{flex-direction:column;align-items:center}
  .btn{width:100%;justify-content:center}
  .search-wrap{max-width:100%}
}

/* === 懒加载占位 === */
img[loading="lazy"]{transition:opacity .5s}
img[loading="lazy"].loaded{opacity:1}

/* === H5 Video 元素 === */
.video-thumb video{width:100%;height:100%;object-fit:cover;position:absolute;top:0;left:0}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;cursor:pointer;background:#0a0e17}
.video-card:hover .play-btn{opacity:1}
.video-card.hover .play-btn{opacity:1}

/* === 内容规范声明 === */
.content-policy{background:#141B2D;border-radius:10px;padding:16px 24px;margin:20px 0;border-left:3px solid #F4A261}
.content-policy p{color:#8892A4;font-size:.82rem;line-height:1.8}

/* === ICP备案 === */
.icp-info{color:#555;font-size:.78rem;margin-top:4px}

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

/* === 滚动条 === */
/* === 视频播放状态 === */
.video-thumb video::-webkit-media-controls{display:none}

::-webkit-scrollbar{width:8px}
::-webkit-scrollbar-track{background:#0A0E17}
::-webkit-scrollbar-thumb{background:#1D3557;border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:#E63946}