/* 91 修车改装视频社区 - 原创CSS */
/* 配色：机械深蓝 #1a1a2e + 赛车红 #e94560 + 改装橙 #f77f00 */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;background:#0f0f1a;color:#eaeaea;line-height:1.7;overflow-x:hidden}
a{color:#e94560;text-decoration:none;transition:color .3s}
a:hover{color:#f77f00}
img{max-width:100%;height:auto;display:block}
.container{max-width:1280px;margin:0 auto;padding:0 20px}

/* 导航栏 */
.site-nav{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(15,15,26,.95);backdrop-filter:blur(12px);border-bottom:2px solid #e94560;padding:0 30px;display:flex;align-items:center;justify-content:space-between;height:68px}
.nav-logo img{height:48px;width:auto}
.nav-links{display:flex;gap:24px;align-items:center}
.nav-links a{color:#eaeaea;font-size:15px;font-weight:500;padding:8px 0;position:relative}
.nav-links a::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:linear-gradient(90deg,#e94560,#f77f00);transition:width .3s}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-links a:hover{color:#f77f00}
.nav-search{position:relative}
.nav-search input{background:rgba(255,255,255,.08);border:1px solid rgba(233,69,96,.3);border-radius:20px;padding:8px 36px 8px 16px;color:#eaeaea;font-size:14px;width:200px;outline:none;transition:border-color .3s,width .3s}
.nav-search input:focus{border-color:#e94560;width:260px}
.nav-search button{position:absolute;right:10px;top:50%;transform:translateY(-50%);background:none;border:none;color:#e94560;font-size:16px;cursor:pointer}
.mobile-menu-btn{display:none;background:none;border:none;color:#eaeaea;font-size:28px;cursor:pointer}

/* Hero Banner */
.hero{position:relative;min-height:85vh;display:flex;align-items:center;justify-content:center;text-align:center;margin-top:68px;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.4)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,15,26,.3) 0%,rgba(15,15,26,.85) 100%)}
.hero-content{position:relative;z-index:2;max-width:800px;padding:40px 20px}
.hero-content h1{font-size:3.2rem;font-weight:800;margin-bottom:16px;background:linear-gradient(135deg,#e94560,#f77f00);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:none}
.hero-content .subtitle{font-size:1.3rem;color:#8892b0;margin-bottom:28px;line-height:1.8}
.hero-btn{display:inline-block;padding:14px 40px;background:linear-gradient(135deg,#e94560,#f77f00);color:#fff;border-radius:30px;font-size:16px;font-weight:600;transition:transform .3s,box-shadow .3s}
.hero-btn:hover{transform:translateY(-3px);box-shadow:0 10px 30px rgba(233,69,96,.4);color:#fff}

/* 统计条 */
.stats-bar{background:linear-gradient(135deg,#16213e,#1a1a2e);padding:40px 0;border-top:1px solid rgba(233,69,96,.2);border-bottom:1px solid rgba(233,69,96,.2)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-item h3{font-size:2.4rem;font-weight:800;background:linear-gradient(135deg,#e94560,#f77f00);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-item p{color:#8892b0;font-size:14px;margin-top:6px}

/* 通用区块 */
.section{padding:70px 0}
.section-title{text-align:center;margin-bottom:50px}
.section-title h2{font-size:2rem;font-weight:700;color:#eaeaea;margin-bottom:10px}
.section-title h2 span{color:#e94560}
.section-title p{color:#8892b0;font-size:15px}

/* 视频卡片网格 */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.video-card{background:#16213e;border-radius:12px;overflow:hidden;transition:transform .3s,box-shadow .3s;cursor:pointer;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(233,69,96,.2)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.08)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:60px;height:60px;background:rgba(233,69,96,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform .3s;z-index:2}
.play-btn::after{content:'';width:0;height:0;border-left:22px solid #fff;border-top:13px solid transparent;border-bottom:13px solid transparent;margin-left:4px}
.video-card:hover .play-btn{transform:translate(-50%,-50%) scale(1)}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px}
.video-info{padding:14px}
.video-info h4{font-size:15px;font-weight:600;color:#eaeaea;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;color:#8892b0;font-size:12px}
.video-meta span{display:flex;align-items:center;gap:4px}

/* 横向滚动区 */
.scroll-section{overflow-x:auto;padding-bottom:16px;display:flex;gap:20px;scrollbar-width:thin;scrollbar-color:#e94560 #16213e}
.scroll-section::-webkit-scrollbar{height:6px}
.scroll-section::-webkit-scrollbar-track{background:#16213e;border-radius:3px}
.scroll-section::-webkit-scrollbar-thumb{background:#e94560;border-radius:3px}
.scroll-card{min-width:280px;background:#16213e;border-radius:12px;overflow:hidden;flex-shrink:0;transition:transform .3s}
.scroll-card:hover{transform:translateY(-4px)}
.scroll-card img{width:100%;height:160px;object-fit:cover}
.scroll-card .card-body{padding:14px}
.scroll-card h4{font-size:15px;color:#eaeaea;margin-bottom:6px}
.scroll-card p{font-size:13px;color:#8892b0}

/* AI赋能模块 */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.ai-card{background:linear-gradient(145deg,#16213e,#1a1a2e);border:1px solid rgba(233,69,96,.15);border-radius:16px;padding:36px 28px;text-align:center;transition:border-color .3s,transform .3s}
.ai-card:hover{border-color:#e94560;transform:translateY(-4px)}
.ai-icon{font-size:48px;margin-bottom:16px}
.ai-card h4{font-size:18px;color:#eaeaea;margin-bottom:10px}
.ai-card p{font-size:14px;color:#8892b0;line-height:1.7}

/* 社区标签云 */
.tag-cloud{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;padding:20px 0}
.tag-cloud a{padding:8px 20px;background:rgba(233,69,96,.1);border:1px solid rgba(233,69,96,.3);border-radius:20px;color:#e94560;font-size:14px;transition:all .3s}
.tag-cloud a:hover{background:#e94560;color:#fff}

/* 专家展示 */
.expert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.expert-card{text-align:center;background:#16213e;border-radius:16px;padding:32px 20px;transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-avatar{width:120px;height:120px;border-radius:50%;margin:0 auto 16px;overflow:hidden;border:3px solid #e94560}
.expert-avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h4{font-size:17px;color:#eaeaea;margin-bottom:4px}
.expert-card .role{color:#f77f00;font-size:13px;margin-bottom:10px}
.expert-card p{font-size:13px;color:#8892b0;line-height:1.6}
.expert-card .expert-btn{display:inline-block;margin-top:12px;padding:8px 20px;border:1px solid #e94560;border-radius:20px;color:#e94560;font-size:13px;transition:all .3s}
.expert-card .expert-btn:hover{background:#e94560;color:#fff}

/* 品牌墙 */
.brand-wall{display:flex;flex-wrap:wrap;gap:24px;justify-content:center;align-items:center;padding:20px 0}
.brand-wall span{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:10px;padding:14px 28px;font-size:15px;color:#8892b0;transition:all .3s}
.brand-wall span:hover{border-color:#e94560;color:#e94560}

/* How-To */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:step}
.howto-step{background:#16213e;border-radius:12px;padding:28px 20px;text-align:center;position:relative;counter-increment:step}
.howto-step::before{content:counter(step);display:block;width:44px;height:44px;line-height:44px;background:linear-gradient(135deg,#e94560,#f77f00);border-radius:50%;color:#fff;font-size:20px;font-weight:700;margin:0 auto 14px}
.howto-step h4{font-size:16px;color:#eaeaea;margin-bottom:8px}
.howto-step p{font-size:13px;color:#8892b0}

/* 用户评价 */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.review-card{background:#16213e;border-radius:12px;padding:24px;border-left:4px solid #e94560}
.review-card .stars{color:#f77f00;font-size:16px;margin-bottom:8px}
.review-card p{font-size:14px;color:#eaeaea;line-height:1.7;margin-bottom:10px;font-style:italic}
.review-card .reviewer{color:#8892b0;font-size:13px}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#16213e;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-size:15px;font-weight:600;color:#eaeaea;transition:background .3s}
.faq-q:hover{background:rgba(233,69,96,.1)}
.faq-q::after{content:'+';font-size:22px;color:#e94560;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:0 24px}
.faq-item.active .faq-a{max-height:300px;padding:0 24px 18px}
.faq-a p{font-size:14px;color:#8892b0;line-height:1.7}

/* 联系我们 */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
.contact-info{background:#16213e;border-radius:12px;padding:28px}
.contact-info h4{font-size:17px;color:#eaeaea;margin-bottom:16px;padding-bottom:10px;border-bottom:1px solid rgba(233,69,96,.2)}
.contact-info p{font-size:14px;color:#8892b0;margin-bottom:10px;line-height:1.7}
.contact-info strong{color:#eaeaea}
.qr-codes{display:flex;gap:24px;justify-content:center;align-items:center}
.qr-item{text-align:center}
.qr-item img{width:140px;height:140px;border-radius:10px;border:2px solid rgba(233,69,96,.3)}
.qr-item p{font-size:13px;color:#8892b0;margin-top:8px}

/* 分享栏 */
.share-bar{text-align:center;padding:30px 0;border-top:1px solid rgba(233,69,96,.15)}
.share-bar h4{font-size:16px;color:#eaeaea;margin-bottom:14px}
.share-btns{display:flex;gap:14px;justify-content:center}
.share-btns a{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:50%;background:rgba(233,69,96,.15);color:#e94560;font-size:18px;transition:all .3s}
.share-btns a:hover{background:#e94560;color:#fff;transform:scale(1.1)}

/* 页脚 */
.site-footer{background:#0a0a14;padding:40px 0 20px;border-top:2px solid #e94560}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;margin-bottom:30px}
.footer-brand img{height:40px;margin-bottom:12px}
.footer-brand p{font-size:13px;color:#8892b0;line-height:1.7}
.footer-links h5{color:#eaeaea;font-size:15px;margin-bottom:14px}
.footer-links a{display:block;color:#8892b0;font-size:13px;margin-bottom:8px;transition:color .3s}
.footer-links a:hover{color:#e94560}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,.05);font-size:13px;color:#8892b0}

/* MCP服务前端 */
.mcp-widget{background:#16213e;border-radius:12px;padding:20px;margin:20px 0;border:1px solid rgba(233,69,96,.15)}

/* 面包屑 */
.breadcrumb{padding:12px 0;font-size:13px;color:#8892b0}
.breadcrumb a{color:#e94560}
.breadcrumb span{margin:0 6px}

/* 干扰标签隐藏 */
.interference{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;opacity:0;pointer-events:none}

/* 响应式 */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(3,1fr)}
  .ai-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .site-nav{padding:0 16px}
  .nav-links{display:none;position:fixed;top:68px;left:0;width:100%;background:rgba(15,15,26,.98);flex-direction:column;padding:20px;gap:16px}
  .nav-links.active{display:flex}
  .mobile-menu-btn{display:block}
  .nav-search{display:none}
  .hero-content h1{font-size:2rem}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .ai-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .qr-codes{flex-direction:column}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .hero{min-height:70vh}
  .hero-content h1{font-size:1.6rem}
}