/* ============================================
   91 修车改装视频社区 - 原创样式表
   品牌色系：赛车红 #E63946 / 深海蓝 #1D3557 / 琥珀橙 #F4A261
   ============================================ */

/* === 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:#2B2D42;background:#0D1117;line-height:1.7;overflow-x:hidden}
a{text-decoration:none;color:inherit;transition:color .3s}
ul,ol{list-style:none}
img{max-width:100%;height:auto;display:block}

/* === 通用容器 === */
.container{max-width:1280px;margin:0 auto;padding:0 20px}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:2rem;color:#F1FAEE;position:relative;display:inline-block;padding-bottom:12px}
.section-title h2::after{content:"";position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,#E63946,#F4A261)}
.section-title p{color:#8D99AE;margin-top:10px;font-size:.95rem}
.tag{display:inline-block;padding:3px 10px;border-radius:20px;font-size:.75rem;margin:2px;background:rgba(230,57,70,.15);color:#E63946}

/* === 顶部导航 === */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(13,17,23,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(241,250,238,.08);transition:background .3s}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px}
.logo img{height:42px;width:auto;border-radius:4px}
.logo span{font-size:1.4rem;font-weight:800;color:#F1FAEE;letter-spacing:1px}
.main-nav{display:flex;align-items:center;gap:28px}
.main-nav a{color:#8D99AE;font-size:.9rem;font-weight:500;transition:color .3s;position:relative}
.main-nav a:hover,.main-nav a.active{color:#E63946}
.main-nav a::after{content:"";position:absolute;bottom:-4px;left:0;width:0;height:2px;background:#E63946;transition:width .3s}
.main-nav a:hover::after{width:100%}

/* 搜索框 */
.search-bar{position:relative;width:100%;max-width:640px;margin:0 auto;padding:10px 20px;background:rgba(13,17,23,.85)}
.search-bar input{width:100%;padding:10px 44px 10px 18px;border:1px solid rgba(141,153,174,.3);border-radius:24px;background:rgba(29,53,87,.4);color:#F1FAEE;font-size:.9rem;outline:none;transition:border-color .3s}
.search-bar input:focus{border-color:#E63946}
.search-bar input::placeholder{color:#8D99AE}
.search-bar button{position:absolute;right:28px;top:50%;transform:translateY(-50%);background:none;border:none;color:#F4A261;cursor:pointer;font-size:1.1rem}

/* 移动端菜单 */
.menu-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:5px}
.menu-toggle span{display:block;width:24px;height:2px;background:#F1FAEE;transition:all .3s}

/* === Banner区域 === */
.hero-banner{position:relative;min-height:88vh;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:68px}
.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;text-align:center;padding:40px 20px;max-width:800px}
.hero-content h1{font-size:3rem;color:#F1FAEE;font-weight:900;line-height:1.25;margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.hero-content h1 em{font-style:normal;color:#E63946}
.hero-content p{color:#8D99AE;font-size:1.1rem;margin-bottom:28px;line-height:1.8}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-block;padding:12px 32px;background:linear-gradient(135deg,#E63946,#c0313c);color:#fff;border-radius:30px;font-weight:600;font-size:.95rem;transition:transform .3s,box-shadow .3s;border:none;cursor:pointer}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(230,57,70,.35)}
.btn-outline{display:inline-block;padding:12px 32px;border:2px solid #F4A261;color:#F4A261;border-radius:30px;font-weight:600;font-size:.95rem;transition:all .3s;cursor:pointer;background:transparent}
.btn-outline:hover{background:#F4A261;color:#0D1117}

/* === HTML5 Video Preview === */
.video-card .thumb video.video-preview{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:1;display:none}
.video-card:hover .thumb video.video-preview{display:block}

/* === 视频卡片 === */
.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:#161B22;transition:transform .35s,box-shadow .35s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 36px rgba(230,57,70,.18)}
.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(1.06)}
.video-card .play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:56px;height:56px;background:rgba(230,57,70,.88);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform .35s;z-index:3}
.video-card:hover .play-btn{transform:translate(-50%,-50%) scale(1)}
.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 .card-body{padding:16px}
.video-card .card-body h3{font-size:1rem;color:#F1FAEE;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-body .meta{display:flex;gap:14px;color:#8D99AE;font-size:.8rem}
.video-card .card-body .meta span{display:flex;align-items:center;gap:4px}
.video-card .duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#F1FAEE;padding:2px 8px;border-radius:4px;font-size:.75rem;z-index:2}

/* 短视频竖版卡片 */
.short-video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.short-card{position:relative;border-radius:12px;overflow:hidden;background:#161B22;aspect-ratio:9/16;cursor:pointer}
.short-card img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.short-card:hover img{transform:scale(1.05)}
.short-card .play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:48px;height:48px;background:rgba(230,57,70,.88);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform .35s;z-index:3}
.short-card:hover .play-btn{transform:translate(-50%,-50%) scale(1)}
.short-card .short-info{position:absolute;bottom:0;left:0;right:0;padding:12px;background:linear-gradient(transparent,rgba(0,0,0,.85));color:#F1FAEE;font-size:.85rem}

/* === 分区背景 === */
.section-dark{padding:80px 0;background:#0D1117}
.section-alt{padding:80px 0;background:#161B22}
.section-gradient{padding:80px 0;background:linear-gradient(180deg,#0D1117 0%,#1D3557 100%)}

/* === AI赋能模块 === */
.ai-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.ai-card{background:rgba(29,53,87,.35);border:1px solid rgba(141,153,174,.15);border-radius:16px;padding:32px 24px;text-align:center;transition:transform .3s,border-color .3s}
.ai-card:hover{transform:translateY(-4px);border-color:#E63946}
.ai-card .icon{font-size:2.4rem;margin-bottom:16px}
.ai-card h3{color:#F1FAEE;font-size:1.1rem;margin-bottom:10px}
.ai-card p{color:#8D99AE;font-size:.88rem;line-height:1.7}

/* === 专家团队 === */
.team-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:28px}
.team-card{background:#161B22;border-radius:16px;overflow:hidden;text-align:center;transition:transform .3s}
.team-card:hover{transform:translateY(-4px)}
.team-card .avatar{width:100%;aspect-ratio:1;overflow:hidden}
.team-card .avatar img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.team-card:hover .avatar img{transform:scale(1.05)}
.team-card .info{padding:20px}
.team-card .info h3{color:#F1FAEE;font-size:1.05rem;margin-bottom:4px}
.team-card .info .role{color:#E63946;font-size:.85rem;margin-bottom:10px}
.team-card .info p{color:#8D99AE;font-size:.85rem;line-height:1.6;margin-bottom:12px}
.team-card .social-links{display:flex;gap:10px;justify-content:center}
.team-card .social-links a{width:32px;height:32px;border-radius:50%;background:rgba(230,57,70,.15);display:flex;align-items:center;justify-content:center;color:#E63946;font-size:.85rem;transition:background .3s}
.team-card .social-links a:hover{background:#E63946;color:#fff}
.team-btns{display:flex;gap:10px;justify-content:center;margin-top:12px}
.team-btns a{padding:6px 16px;border-radius:20px;font-size:.8rem;border:1px solid rgba(141,153,174,.3);color:#8D99AE;transition:all .3s}
.team-btns a:hover{border-color:#E63946;color:#E63946}

/* === 合作品牌墙 === */
.brand-wall{display:flex;flex-wrap:wrap;gap:24px;justify-content:center;align-items:center}
.brand-wall .brand-item{width:140px;height:70px;background:rgba(29,53,87,.3);border:1px solid rgba(141,153,174,.15);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#8D99AE;font-weight:600;font-size:.9rem;transition:all .3s}
.brand-wall .brand-item:hover{border-color:#F4A261;color:#F4A261}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid rgba(141,153,174,.15);border-radius:10px;margin-bottom:12px;overflow:hidden;background:#161B22}
.faq-item .faq-q{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;color:#F1FAEE;font-weight:600;font-size:.95rem;transition:background .3s}
.faq-item .faq-q:hover{background:rgba(230,57,70,.08)}
.faq-item .faq-q .arrow{transition:transform .3s;color:#E63946;font-size:1.2rem}
.faq-item.active .faq-q .arrow{transform:rotate(180deg)}
.faq-item .faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px}
.faq-item.active .faq-a{max-height:500px;padding:0 24px 18px}
.faq-item .faq-a p{color:#8D99AE;font-size:.9rem;line-height:1.8}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.review-card{background:#161B22;border:1px solid rgba(141,153,174,.1);border-radius:14px;padding:24px;transition:transform .3s}
.review-card:hover{transform:translateY(-3px)}
.review-card .stars{color:#F4A261;font-size:1rem;margin-bottom:10px;letter-spacing:2px}
.review-card .review-text{color:#8D99AE;font-size:.9rem;line-height:1.7;margin-bottom:14px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer .avatar-sm{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#E63946,#F4A261);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.85rem}
.review-card .reviewer .name{color:#F1FAEE;font-size:.85rem;font-weight:600}
.review-card .reviewer .date{color:#8D99AE;font-size:.75rem}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:28px}
.contact-card{background:rgba(29,53,87,.25);border:1px solid rgba(141,153,174,.12);border-radius:14px;padding:28px;text-align:center}
.contact-card h3{color:#F1FAEE;font-size:1.05rem;margin-bottom:14px}
.contact-card p{color:#8D99AE;font-size:.88rem;line-height:1.7;margin-bottom:6px}
.contact-card img{max-width:160px;margin:12px auto 0;border-radius:8px}

/* === 社区模块 === */
.community-tabs{display:flex;gap:12px;justify-content:center;margin-bottom:32px;flex-wrap:wrap}
.community-tabs .tab-btn{padding:8px 22px;border-radius:24px;border:1px solid rgba(141,153,174,.3);color:#8D99AE;cursor:pointer;font-size:.88rem;transition:all .3s;background:transparent}
.community-tabs .tab-btn.active,.community-tabs .tab-btn:hover{background:#E63946;border-color:#E63946;color:#fff}

/* === How-To指南 === */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px;counter-reset:step}
.howto-step{background:rgba(29,53,87,.25);border-radius:14px;padding:28px 20px;text-align:center;position:relative;counter-increment:step}
.howto-step::before{content:counter(step);display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#E63946,#F4A261);color:#fff;font-weight:800;font-size:1.1rem;margin:0 auto 16px}
.howto-step h3{color:#F1FAEE;font-size:1rem;margin-bottom:8px}
.howto-step p{color:#8D99AE;font-size:.85rem;line-height:1.6}

/* === 分享按钮 === */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.share-btn{padding:8px 20px;border-radius:24px;font-size:.85rem;font-weight:500;transition:all .3s;cursor:pointer;border:none}
.share-btn.wechat{background:#07C160;color:#fff}
.share-btn.weibo{background:#E6162D;color:#fff}
.share-btn.douyin{background:#161823;color:#fff;border:1px solid #FE2C55}
.share-btn.bilibili{background:#00A1D6;color:#fff}
.share-btn:hover{opacity:.85;transform:translateY(-2px)}

/* === 页脚 === */
.site-footer{background:#0a0e14;padding:48px 0 0;border-top:1px solid rgba(141,153,174,.1)}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:32px;margin-bottom:32px}
.footer-col h4{color:#F1FAEE;font-size:1rem;margin-bottom:16px;position:relative;padding-bottom:8px}
.footer-col h4::after{content:"";position:absolute;bottom:0;left:0;width:30px;height:2px;background:#E63946}
.footer-col p,.footer-col a{color:#8D99AE;font-size:.85rem;line-height:2;display:block;transition:color .3s}
.footer-col a:hover{color:#E63946}
.footer-col img{max-width:120px;border-radius:6px;margin-top:8px}
.footer-bottom{text-align:center;padding:20px 0;border-top:1px solid rgba(141,153,174,.08);color:#8D99AE;font-size:.8rem}
.footer-bottom a{color:#E63946}

/* === 面包屑 === */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#8D99AE}
.breadcrumb a{color:#E63946;transition:opacity .3s}
.breadcrumb a:hover{opacity:.8}
.breadcrumb span{margin:0 6px;color:#8D99AE}

/* === 内页通用 === */
.page-hero{padding:120px 0 60px;text-align:center;background:linear-gradient(180deg,rgba(29,53,87,.6),#0D1117)}
.page-hero h1{font-size:2.4rem;color:#F1FAEE;margin-bottom:12px}
.page-hero p{color:#8D99AE;font-size:1rem}

/* === 数据统计条 === */
.stats-bar{display:flex;justify-content:center;gap:48px;flex-wrap:wrap;padding:40px 0}
.stat-item{text-align:center}
.stat-item .num{font-size:2.2rem;font-weight:800;color:#E63946;display:block}
.stat-item .label{color:#8D99AE;font-size:.85rem;margin-top:4px}

/* === MCP服务前端 === */
.mcp-widget{background:rgba(29,53,87,.2);border:1px solid rgba(141,153,174,.12);border-radius:12px;padding:24px;margin-top:20px}
.mcp-widget h4{color:#F1FAEE;margin-bottom:12px}
.mcp-widget .mcp-input{display:flex;gap:10px}
.mcp-widget input{flex:1;padding:10px 16px;border:1px solid rgba(141,153,174,.3);border-radius:8px;background:rgba(13,17,23,.6);color:#F1FAEE;font-size:.9rem;outline:none}
.mcp-widget input:focus{border-color:#E63946}
.mcp-widget button{padding:10px 24px;background:#E63946;color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:.9rem;transition:background .3s}
.mcp-widget button:hover{background:#c0313c}

/* === 响应式 === */
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:68px;left:0;width:100%;background:rgba(13,17,23,.98);flex-direction:column;padding:20px;gap:16px}
  .main-nav.open{display:flex}
  .menu-toggle{display:flex}
  .hero-content h1{font-size:2rem}
  .video-grid{grid-template-columns:1fr}
  .short-video-grid{grid-template-columns:repeat(2,1fr)}
  .team-grid{grid-template-columns:repeat(2,1fr)}
  .stats-bar{gap:24px}
  .stat-item .num{font-size:1.6rem}
  .footer-grid{grid-template-columns:1fr 1fr}
  .search-bar{padding:8px 12px}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .hero-content h1{font-size:1.6rem}
  .team-grid{grid-template-columns:1fr}
  .short-video-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-btns{flex-direction:column;align-items:center}
}

/* === 信任链接 === */
.footer-trust{text-align:center;padding:12px 0;border-top:1px solid rgba(141,153,174,.08)}
.footer-trust a{color:#8D99AE;font-size:.8rem;margin:0 10px;text-decoration:none;transition:color .3s}
.footer-trust a:hover{color:#E63946}

/* === 最近更新模块 === */
#latest-updates .video-card .card-body h3{color:#F4A261}