/* ========================================
   91 修车改装视频社区 - 全站样式
   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;background:#0D1117;color:#F1FAEE;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:#F1FAEE}

/* === 容器 === */
.container{max-width:1200px;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(13,17,23,.95);backdrop-filter:blur(10px);border-bottom:1px solid rgba(230,57,70,.3);transition:all .3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;max-width:1200px;margin:0 auto}
.logo-link{display:flex;align-items:center;gap:10px}
.logo-link img{width:50px;height:50px}
.logo-text{font-size:24px;font-weight:900;color:#E63946;letter-spacing:2px}
.logo-text span{color:#F4A261}

.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{padding:12px 16px;font-size:14px;color:#F1FAEE;font-weight:500;position:relative;transition:all .3s}
.main-nav a::after{content:"";position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:0;height:2px;background:#E63946;transition:width .3s}
.main-nav a:hover,.main-nav a.active{color:#E63946}
.main-nav a:hover::after,.main-nav a.active::after{width:70%}

.mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:5px}
.mobile-toggle span{width:25px;height:2px;background:#F1FAEE;transition:all .3s}

/* === 搜索框 === */
.search-bar{background:#161B22;padding:15px 0;border-bottom:1px solid rgba(29,53,87,.5)}
.search-wrap{max-width:600px;margin:0 auto;display:flex;gap:10px;padding:0 20px}
.search-wrap input{flex:1;padding:10px 18px;border:2px solid #1D3557;border-radius:25px;background:#0D1117;color:#F1FAEE;font-size:14px;outline:none;transition:border-color .3s}
.search-wrap input:focus{border-color:#E63946}
.search-wrap input::placeholder{color:#8B949E}
.search-wrap button{padding:10px 24px;background:linear-gradient(135deg,#E63946,#c62828);color:#fff;border:none;border-radius:25px;cursor:pointer;font-size:14px;font-weight:600;transition:transform .2s,box-shadow .3s}
.search-wrap button:hover{transform:scale(1.05);box-shadow:0 4px 15px rgba(230,57,70,.4)}

/* === Banner === */
.hero-banner{position:relative;height:75vh;min-height:500px;overflow:hidden;margin-top:70px}
.hero-banner img{width:100%;height:100%;object-fit:cover;filter:brightness(.5)}
.hero-overlay{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:20px;background:linear-gradient(180deg,rgba(13,17,23,.3) 0%,rgba(13,17,23,.8) 100%)}
.hero-overlay h1{font-size:48px;margin-bottom:15px;text-shadow:0 4px 20px rgba(0,0,0,.5)}
.hero-overlay h1 .brand{color:#E63946;font-size:64px}
.hero-overlay p{font-size:18px;max-width:700px;color:#ccc;margin-bottom:25px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.hero-tags span{padding:6px 16px;background:rgba(230,57,70,.2);border:1px solid rgba(230,57,70,.4);border-radius:20px;font-size:13px;color:#F4A261}

/* === 区块通用 === */
.section{padding:60px 0}
.section-dark{background:#0D1117}
.section-alt{background:#161B22}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:32px;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2 .hl{color:#E63946}
.section-title h2::after{content:"";display:block;width:60px;height:3px;background:linear-gradient(90deg,#E63946,#F4A261);margin:10px auto 0}
.section-title p{color:#8B949E;font-size:15px;max-width:600px;margin:0 auto}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:#161B22;border-radius:12px;overflow:hidden;border:1px solid rgba(29,53,87,.4);transition:transform .3s,box-shadow .3s}
.video-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px rgba(230,57,70,.15)}
.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:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;background:rgba(230,57,70,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s,transform .3s}
.play-btn::after{content:"";border-left:20px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:4px}
.video-card:hover .play-btn{opacity:1;transform:translate(-50%,-50%) scale(1.1)}
.video-info{padding:15px}
.video-info h3{font-size:15px;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;font-size:12px;color:#8B949E}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;padding:2px 8px;background:rgba(244,162,97,.15);color:#F4A261;border-radius:10px;font-size:11px;margin-top:8px}

/* === 专家/团队卡片 === */
.team-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.team-card{background:#161B22;border-radius:12px;padding:30px 20px;text-align:center;border:1px solid rgba(29,53,87,.4);transition:transform .3s,border-color .3s}
.team-card:hover{transform:translateY(-5px);border-color:#E63946}
.team-avatar{width:100px;height:100px;border-radius:50%;margin:0 auto 15px;overflow:hidden;border:3px solid #E63946}
.team-avatar img{width:100%;height:100%;object-fit:cover}
.team-card h4{font-size:18px;margin-bottom:5px}
.team-card .role{color:#F4A261;font-size:13px;margin-bottom:10px}
.team-card p{font-size:13px;color:#8B949E;margin-bottom:15px}
.team-card .btn-sm{display:inline-block;padding:6px 18px;background:transparent;border:1px solid #E63946;color:#E63946;border-radius:20px;font-size:12px;transition:all .3s}
.team-card .btn-sm:hover{background:#E63946;color:#fff}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#161B22;border:1px solid rgba(29,53,87,.4);border-radius:10px;margin-bottom:12px;overflow:hidden}
.faq-q{padding:18px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:15px;transition:background .3s}
.faq-q:hover{background:rgba(230,57,70,.05)}
.faq-q::after{content:"+";font-size:20px;color:#E63946;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 20px}
.faq-item.active .faq-a{max-height:300px;padding:0 20px 18px}
.faq-a p{font-size:14px;color:#8B949E;line-height:1.8}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.review-card{background:#161B22;border-radius:12px;padding:24px;border:1px solid rgba(29,53,87,.4)}
.review-stars{color:#F4A261;font-size:16px;margin-bottom:10px;letter-spacing:2px}
.review-card p{font-size:14px;color:#ccc;margin-bottom:15px;line-height:1.8;font-style:italic}
.review-author{display:flex;align-items:center;gap:10px}
.review-author .avatar{width:40px;height:40px;border-radius:50%;background:#1D3557;display:flex;align-items:center;justify-content:center;color:#F4A261;font-weight:700;font-size:16px}
.review-author .name{font-size:14px;font-weight:600}
.review-author .date{font-size:12px;color:#8B949E}

/* === 合作品牌 === */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.brand-wall .brand-item{width:120px;height:60px;background:#1D3557;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;color:#F1FAEE;opacity:.7;transition:opacity .3s,transform .3s}
.brand-wall .brand-item:hover{opacity:1;transform:scale(1.05)}

/* === AI赋能 === */
.ai-features{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.ai-card{background:#161B22;border-radius:12px;padding:30px;border:1px solid rgba(29,53,87,.4);text-align:center;transition:transform .3s,border-color .3s}
.ai-card:hover{transform:translateY(-5px);border-color:#F4A261}
.ai-icon{font-size:40px;margin-bottom:15px}
.ai-card h4{font-size:17px;margin-bottom:10px;color:#F4A261}
.ai-card p{font-size:13px;color:#8B949E}

/* === 社区功能 === */
.community-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:20px}
.community-item{background:#161B22;border-radius:12px;padding:25px 15px;text-align:center;border:1px solid rgba(29,53,87,.4);transition:all .3s}
.community-item:hover{border-color:#E63946;transform:translateY(-3px)}
.community-item .icon{font-size:32px;margin-bottom:10px}
.community-item h5{font-size:15px;margin-bottom:5px}
.community-item p{font-size:12px;color:#8B949E}

/* === 按钮 === */
.btn{display:inline-block;padding:12px 30px;border-radius:25px;font-size:14px;font-weight:600;cursor:pointer;transition:all .3s;border:none}
.btn-primary{background:linear-gradient(135deg,#E63946,#c62828);color:#fff}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(230,57,70,.4);color:#fff}
.btn-outline{background:transparent;border:2px solid #F4A261;color:#F4A261}
.btn-outline:hover{background:#F4A261;color:#0D1117}

/* === 页脚 === */
.site-footer{background:#0a0d12;border-top:1px solid rgba(29,53,87,.5);padding:50px 0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:30px}
.footer-col h4{font-size:16px;margin-bottom:15px;color:#E63946;position:relative;padding-bottom:10px}
.footer-col h4::after{content:"";position:absolute;bottom:0;left:0;width:30px;height:2px;background:#F4A261}
.footer-col p,.footer-col li{font-size:13px;color:#8B949E;margin-bottom:8px}
.footer-col a{color:#8B949E;font-size:13px}
.footer-col a:hover{color:#F4A261}
.footer-qr{display:flex;gap:20px;margin-top:10px}
.footer-qr .qr-item{text-align:center}
.footer-qr .qr-item img{width:100px;height:100px;border-radius:8px;margin-bottom:5px}
.footer-qr .qr-item span{font-size:11px;color:#8B949E}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(29,53,87,.3);font-size:12px;color:#8B949E}
.footer-bottom .update-time{margin-top:5px;color:#F4A261}

/* === 社交分享 === */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.share-btn{padding:8px 18px;border-radius:20px;font-size:12px;font-weight:600;transition:all .3s;cursor:pointer}
.share-wechat{background:rgba(7,193,96,.15);color:#07C160;border:1px solid rgba(7,193,96,.3)}
.share-weibo{background:rgba(230,57,70,.15);color:#E63946;border:1px solid rgba(230,57,70,.3)}
.share-douyin{background:rgba(37,37,37,.5);color:#F1FAEE;border:1px solid rgba(241,250,238,.3)}
.share-bilibili{background:rgba(0,174,236,.15);color:#00AEEC;border:1px solid rgba(0,174,236,.3)}
.share-btn:hover{transform:translateY(-2px)}

/* === 面包屑 === */
.breadcrumb{padding:15px 0;font-size:13px;color:#8B949E}
.breadcrumb a{color:#F4A261}
.breadcrumb span{margin:0 8px;color:#555}

/* === 内页Banner === */
.page-banner{position:relative;height:300px;margin-top:70px;overflow:hidden}
.page-banner img{width:100%;height:100%;object-fit:cover;filter:brightness(.4)}
.page-banner .overlay{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center}
.page-banner h1{font-size:36px;margin-bottom:10px}
.page-banner p{color:#8B949E;font-size:15px}

/* === 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:#161B22;border-radius:12px;padding:30px 20px;border:1px solid rgba(29,53,87,.4);position:relative;counter-increment:step}
.howto-step::before{content:counter(step);position:absolute;top:-15px;left:20px;width:35px;height:35px;background:#E63946;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:16px}
.howto-step h4{margin-bottom:10px;margin-top:5px}
.howto-step p{font-size:13px;color:#8B949E}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.contact-card{background:#161B22;border-radius:12px;padding:30px;border:1px solid rgba(29,53,87,.4);text-align:center}
.contact-card .icon{font-size:36px;margin-bottom:15px}
.contact-card h4{margin-bottom:10px;color:#F4A261}
.contact-card p{font-size:14px;color:#8B949E}

/* === 配件卡片 === */
.parts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:24px}
.part-card{background:#161B22;border-radius:12px;overflow:hidden;border:1px solid rgba(29,53,87,.4);transition:transform .3s}
.part-card:hover{transform:translateY(-5px)}
.part-card .part-img{height:180px;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:15px}
.part-card .part-info h4{font-size:15px;margin-bottom:8px}
.part-card .part-info .price{color:#E63946;font-weight:700;font-size:18px}
.part-card .part-info p{font-size:12px;color:#8B949E;margin-top:5px}

/* === 数据统计 === */
.stats-bar{display:flex;justify-content:center;gap:40px;flex-wrap:wrap;padding:30px 0}
.stat-item{text-align:center}
.stat-item .num{font-size:36px;font-weight:900;color:#E63946;display:block}
.stat-item .label{font-size:13px;color:#8B949E;margin-top:5px}

/* === 创作中心 === */
.create-features{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.create-card{background:#161B22;border-radius:12px;padding:30px;border:1px solid rgba(29,53,87,.4);display:flex;gap:20px;align-items:flex-start;transition:transform .3s}
.create-card:hover{transform:translateY(-3px)}
.create-card .icon{font-size:36px;flex-shrink:0}
.create-card h4{font-size:16px;margin-bottom:8px;color:#F4A261}
.create-card p{font-size:13px;color:#8B949E}

/* === 响应式 === */
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:100%;left:0;width:100%;background:#0D1117;flex-direction:column;padding:10px 0;border-top:1px solid rgba(29,53,87,.5)}
  .main-nav.show{display:flex}
  .main-nav a{padding:12px 20px;width:100%;text-align:left}
  .mobile-toggle{display:flex}
  .hero-banner{height:50vh;min-height:350px}
  .hero-overlay h1{font-size:28px}
  .hero-overlay h1 .brand{font-size:40px}
  .hero-overlay p{font-size:14px}
  .section-title h2{font-size:24px}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
  .footer-grid{grid-template-columns:1fr}
  .stats-bar{gap:20px}
  .stat-item .num{font-size:28px}
  .page-banner{height:200px}
  .page-banner h1{font-size:24px}
  .header-inner{padding:8px 15px}
}

@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .team-grid{grid-template-columns:1fr}
  .hero-banner{height:40vh;min-height:280px}
  .hero-overlay h1{font-size:22px}
  .hero-overlay h1 .brand{font-size:32px}
  .search-wrap{flex-direction:column}
  .search-wrap button{width:100%}
}

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

/* === 图片加载 === */
.lazy{opacity:1}

/* === 专家资质标签 === */
.expert-credentials{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-bottom:10px}
.credential{display:inline-block;padding:3px 10px;background:rgba(230,57,70,.12);border:1px solid rgba(230,57,70,.3);border-radius:12px;font-size:11px;color:#E63946}

/* === 视频时长标签 === */
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:11px;font-weight:600;z-index:2}

/* === 视频描述 === */
.video-desc{font-size:12px;color:#8B949E;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.6}

/* === 视频标签组 === */
.video-tags{display:flex;flex-wrap:wrap;gap:4px;margin-top:6px}

/* === 内容块（隐私政策等） === */
.content-block{line-height:1.9}
.content-block h2{font-size:28px;margin-bottom:20px;color:#E63946}
.content-block h3{font-size:20px;margin:30px 0 15px;color:#F4A261;border-left:3px solid #E63946;padding-left:12px}
.content-block p{font-size:15px;color:#ccc;margin-bottom:12px}

/* === video元素隐藏（用poster做封面） === */
.video-thumb video{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;z-index:0;display:none}
.video-card:hover .video-thumb video{display:block}

/* === 步骤编号 === */
.step-num{width:50px;height:50px;background:linear-gradient(135deg,#E63946,#c62828);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:900;color:#fff;margin:0 auto 15px}