/* ============================================
   91 修车改装视频社区 - 全站样式表
   品牌色: #C41230(赛车红) #1A1A2E(深夜蓝) #E8E8E8(银灰)
   ============================================ */

/* === 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;color:#222;background:#0d0d14;line-height:1.7}
a{text-decoration:none;color:inherit;transition:color .3s}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.container{max-width:1280px;margin:0 auto;padding:0 20px}

/* === 头部导航 === */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(13,13,20,.95);backdrop-filter:blur(12px);border-bottom:1px solid rgba(196,18,48,.3);transition:all .3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px;max-width:1280px;margin:0 auto;padding:0 20px}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:45px;width:auto}
.logo-wrap span{font-size:22px;font-weight:700;color:#fff;letter-spacing:2px}
.main-nav{display:flex;gap:0}
.main-nav a{color:#ccc;padding:8px 16px;font-size:15px;font-weight:500;transition:all .3s;position:relative}
.main-nav a:hover,.main-nav a.active{color:#C41230}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:2px;background:#C41230;transition:all .3s;transform:translateX(-50%)}
.main-nav a:hover::after,.main-nav a.active::after{width:60%}
.mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:5px}
.mobile-toggle span{width:25px;height:2px;background:#fff;transition:all .3s}

/* === 搜索框 === */
.search-bar{background:rgba(26,26,46,.9);padding:12px 0;border-bottom:1px solid rgba(255,255,255,.05)}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;max-width:600px;width:100%}
.search-box input{flex:1;padding:10px 18px;border:1px solid rgba(196,18,48,.4);border-right:none;border-radius:25px 0 0 25px;background:rgba(255,255,255,.06);color:#fff;font-size:14px;outline:none;transition:border-color .3s}
.search-box input:focus{border-color:#C41230}
.search-box input::placeholder{color:#888}
.search-box button{padding:10px 24px;background:linear-gradient(135deg,#C41230,#8B0A20);color:#fff;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:14px;font-weight:600;transition:all .3s}
.search-box button:hover{background:linear-gradient(135deg,#E0142F,#C41230)}

/* === Banner === */
.hero-banner{position:relative;height:75vh;min-height:500px;overflow:hidden;margin-top:70px}
.hero-banner .bg-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:brightness(.55)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(to bottom,rgba(13,13,20,.3),rgba(13,13,20,.9))}
.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:52px;font-weight:800;color:#fff;margin-bottom:16px;text-shadow:0 2px 20px rgba(196,18,48,.5)}
.hero-content h1 em{font-style:normal;color:#C41230}
.hero-content p{font-size:18px;color:#ccc;max-width:700px;margin-bottom:30px;line-height:1.8}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.btn-primary{display:inline-block;padding:14px 36px;background:linear-gradient(135deg,#C41230,#8B0A20);color:#fff;border-radius:30px;font-size:16px;font-weight:600;transition:all .3s;border:none;cursor:pointer}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(196,18,48,.4)}
.btn-outline{display:inline-block;padding:14px 36px;border:2px solid #C41230;color:#C41230;border-radius:30px;font-size:16px;font-weight:600;transition:all .3s;background:transparent;cursor:pointer}
.btn-outline:hover{background:#C41230;color:#fff}

/* === 通用区块 === */
.section{padding:70px 0}
.section-dark{background:#0d0d14}
.section-alt{background:#111122}
.section-header{text-align:center;margin-bottom:50px}
.section-header h2{font-size:36px;font-weight:700;color:#fff;margin-bottom:12px}
.section-header h2 em{font-style:normal;color:#C41230}
.section-header p{font-size:16px;color:#999;max-width:600px;margin:0 auto}
.section-header .tag{display:inline-block;padding:4px 16px;background:rgba(196,18,48,.15);color:#C41230;border-radius:20px;font-size:13px;font-weight:600;margin-bottom:12px;letter-spacing:1px}

/* === 面包屑 === */
.breadcrumb{padding:15px 0;font-size:13px;color:#888}
.breadcrumb a{color:#C41230}
.breadcrumb span{margin:0 8px;color:#555}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.video-card{position:relative;border-radius:12px;overflow:hidden;background:#1a1a2e;transition:all .4s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(196,18,48,.2)}
.video-card .thumb{position:relative;padding-top:56.25%;overflow:hidden}
.video-card .thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .thumb img{transform:scale(1.08)}
.video-card .play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:60px;height:60px;background:rgba(196,18,48,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .3s;z-index:2}
.video-card:hover .play-btn{transform:translate(-50%,-50%) scale(1)}
.play-btn::after{content:'';width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:3px}
.video-card .card-body{padding:16px}
.video-card .card-body h3{font-size:16px;color:#fff;font-weight:600;margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-meta{display:flex;gap:16px;font-size:12px;color:#888}
.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,.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px;z-index:2}
.video-card .tag-label{position:absolute;top:10px;left:10px;background:rgba(196,18,48,.9);color:#fff;padding:3px 10px;border-radius:4px;font-size:11px;font-weight:600;z-index:2}

/* === 专家卡片 === */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:28px}
.expert-card{background:#1a1a2e;border-radius:16px;padding:30px;text-align:center;transition:all .4s;border:1px solid rgba(255,255,255,.05)}
.expert-card:hover{border-color:rgba(196,18,48,.3);transform:translateY(-4px)}
.expert-card .avatar{width:110px;height:110px;border-radius:50%;margin:0 auto 16px;overflow:hidden;border:3px solid #C41230}
.expert-card .avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h4{font-size:18px;color:#fff;margin-bottom:4px}
.expert-card .role{color:#C41230;font-size:13px;font-weight:600;margin-bottom:12px}
.expert-card p{font-size:13px;color:#999;line-height:1.6;margin-bottom:16px}
.expert-card .social-links{display:flex;justify-content:center;gap:10px}
.expert-card .social-links a{width:34px;height:34px;border-radius:50%;background:rgba(196,18,48,.15);color:#C41230;display:flex;align-items:center;justify-content:center;font-size:14px;transition:all .3s}
.expert-card .social-links a:hover{background:#C41230;color:#fff}
.expert-card .btn-sm{display:inline-block;margin-top:12px;padding:8px 20px;background:transparent;border:1px solid #C41230;color:#C41230;border-radius:20px;font-size:13px;transition:all .3s}
.expert-card .btn-sm:hover{background:#C41230;color:#fff}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#1a1a2e;border-radius:10px;margin-bottom:12px;overflow:hidden;border:1px solid rgba(255,255,255,.05)}
.faq-item .faq-q{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;color:#fff;font-weight:600;font-size:15px;transition:background .3s}
.faq-item .faq-q:hover{background:rgba(196,18,48,.1)}
.faq-item .faq-q .arrow{color:#C41230;font-size:20px;transition:transform .3s}
.faq-item.open .faq-q .arrow{transform:rotate(180deg)}
.faq-item .faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s;color:#999;font-size:14px;line-height:1.8}
.faq-item.open .faq-a{padding:0 24px 18px;max-height:500px}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.review-card{background:#1a1a2e;border-radius:12px;padding:24px;border:1px solid rgba(255,255,255,.05);transition:all .3s}
.review-card:hover{border-color:rgba(196,18,48,.3)}
.review-card .stars{color:#FFD700;font-size:14px;margin-bottom:10px;letter-spacing:2px}
.review-card .review-text{font-size:14px;color:#ccc;line-height:1.7;margin-bottom:14px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer .r-avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#C41230,#8B0A20);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:16px}
.review-card .reviewer .r-info{font-size:13px}
.review-card .reviewer .r-info strong{color:#fff;display:block}
.review-card .reviewer .r-info span{color:#888}

/* === 合作品牌墙 === */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.brand-wall .brand-item{width:140px;height:70px;background:rgba(255,255,255,.05);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#888;font-size:14px;font-weight:600;transition:all .3s;border:1px solid rgba(255,255,255,.05)}
.brand-wall .brand-item:hover{border-color:#C41230;color:#C41230}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.contact-card{background:#1a1a2e;border-radius:12px;padding:28px;text-align:center;border:1px solid rgba(255,255,255,.05)}
.contact-card h4{color:#fff;font-size:16px;margin-bottom:12px}
.contact-card p{color:#999;font-size:14px;line-height:1.7}
.contact-card .icon{font-size:32px;margin-bottom:12px;color:#C41230}

/* === How-To指南 === */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:24px;counter-reset:step}
.howto-step{background:#1a1a2e;border-radius:12px;padding:28px;text-align:center;position:relative;border:1px solid rgba(255,255,255,.05);counter-increment:step}
.howto-step::before{content:counter(step);position:absolute;top:-14px;left:50%;transform:translateX(-50%);width:28px;height:28px;background:#C41230;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700}
.howto-step h4{color:#fff;font-size:15px;margin-bottom:8px;margin-top:8px}
.howto-step p{color:#999;font-size:13px;line-height:1.6}

/* === 社交分享 === */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.share-bar a{display:flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;font-size:13px;font-weight:600;color:#fff;transition:all .3s}
.share-bar a:hover{transform:translateY(-2px)}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#00A1D6}

/* === 页脚 === */
.site-footer{background:#080810;padding:50px 0 0;border-top:1px solid rgba(196,18,48,.2)}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:40px}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:#C41230}
.footer-col p,.footer-col a{color:#888;font-size:13px;line-height:2}
.footer-col a:hover{color:#C41230}
.footer-col .qr-img{width:120px;border-radius:8px;margin-top:8px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.05);padding:20px 0;text-align:center;color:#666;font-size:13px}
.footer-bottom a{color:#C41230}

/* === AI赋能模块 === */
.ai-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.ai-card{background:linear-gradient(145deg,#1a1a2e,#12121f);border-radius:14px;padding:30px;border:1px solid rgba(196,18,48,.15);transition:all .4s}
.ai-card:hover{border-color:#C41230;transform:translateY(-4px);box-shadow:0 8px 30px rgba(196,18,48,.15)}
.ai-card .ai-icon{font-size:36px;margin-bottom:14px}
.ai-card h4{color:#fff;font-size:17px;margin-bottom:10px}
.ai-card p{color:#999;font-size:13px;line-height:1.7}

/* === 娱乐短视频区 === */
.shorts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.short-card{position:relative;border-radius:12px;overflow:hidden;padding-top:177%;background:#1a1a2e;cursor:pointer}
.short-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.short-card:hover img{transform:scale(1.05)}
.short-card .short-overlay{position:absolute;inset:0;background:linear-gradient(to top,rgba(0,0,0,.8) 0%,transparent 50%);z-index:1}
.short-card .short-info{position:absolute;bottom:12px;left:12px;right:12px;z-index:2;color:#fff}
.short-card .short-info h5{font-size:13px;font-weight:600;margin-bottom:4px}
.short-card .short-info span{font-size:11px;color:#ccc}
.short-card .play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:50px;height:50px;background:rgba(196,18,48,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .3s;z-index:3}
.short-card:hover .play-btn{transform:translate(-50%,-50%) scale(1)}

/* === 内页通用 === */
.page-hero{height:40vh;min-height:300px;position:relative;display:flex;align-items:center;justify-content:center;margin-top:70px;overflow:hidden}
.page-hero .bg-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:brightness(.4)}
.page-hero .overlay{position:absolute;inset:0;background:linear-gradient(to bottom,rgba(13,13,20,.5),rgba(13,13,20,.95))}
.page-hero .content{position:relative;z-index:2;text-align:center}
.page-hero h1{font-size:42px;font-weight:700;color:#fff;margin-bottom:10px}
.page-hero p{color:#ccc;font-size:16px}

/* === 数据统计 === */
.stats-bar{display:flex;justify-content:center;gap:50px;flex-wrap:wrap;padding:30px 0}
.stat-item{text-align:center}
.stat-item .num{font-size:36px;font-weight:800;color:#C41230;display:block}
.stat-item .label{font-size:13px;color:#999;margin-top:4px}

/* === MCP前端 === */
.mcp-widget{background:#1a1a2e;border-radius:12px;padding:20px;margin-top:20px;border:1px solid rgba(196,18,48,.15)}
.mcp-widget h5{color:#fff;font-size:14px;margin-bottom:10px}
.mcp-widget .mcp-status{display:flex;align-items:center;gap:8px;font-size:13px;color:#999}
.mcp-widget .mcp-dot{width:8px;height:8px;border-radius:50%;background:#07C160;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}

/* === 响应式 === */
@media(max-width:768px){
  .header-inner{height:60px}
  .main-nav{display:none;position:fixed;top:60px;left:0;width:100%;background:rgba(13,13,20,.98);flex-direction:column;padding:20px;gap:0}
  .main-nav.open{display:flex}
  .main-nav a{padding:12px 0;border-bottom:1px solid rgba(255,255,255,.05)}
  .mobile-toggle{display:flex}
  .hero-banner{height:60vh;min-height:400px;margin-top:60px}
  .hero-content h1{font-size:30px}
  .hero-content p{font-size:15px}
  .section-header h2{font-size:26px}
  .video-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .stats-bar{gap:25px}
  .stat-item .num{font-size:28px}
  .page-hero{height:30vh;margin-top:60px}
  .page-hero h1{font-size:28px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .shorts-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:480px){
  .hero-content h1{font-size:24px}
  .footer-grid{grid-template-columns:1fr}
  .btn-primary,.btn-outline{padding:12px 24px;font-size:14px}
  .shorts-grid{grid-template-columns:repeat(2,1fr)}
}