/* 91修车改装视频社区 - 原创样式表 */
/* 配色方案：赛车红#E63946 深蓝灰#1D3557 暖橙#F4A261 浅灰绿#F1FAEE 暗黑#0D1117 */

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#2B2D42;background:#F1FAEE;line-height:1.7}
a{color:#E63946;text-decoration:none;transition:color .3s}
a:hover{color:#F4A261}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* 顶部导航 */
.site-header{position:sticky;top:0;z-index:1000;background:#0D1117;box-shadow:0 2px 12px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto;padding:0 20px;height:64px}
.logo-link{display:flex;align-items:center;gap:8px}
.logo-img{height:36px;width:auto}
.logo-text{font-size:24px;font-weight:800;color:#E63946;letter-spacing:2px}
.nav-list{display:flex;list-style:none;gap:4px}
.nav-list a{color:#F1FAEE;padding:8px 16px;border-radius:6px;font-size:15px;font-weight:500;transition:all .3s}
.nav-list a:hover,.nav-list .nav-active{background:#E63946;color:#fff}
.mobile-menu-btn{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.mobile-menu-btn span{width:24px;height:2px;background:#F1FAEE;transition:all .3s}

/* 搜索框 */
.search-bar{background:#1D3557;padding:10px 0}
.search-inner{max-width:700px;margin:0 auto;display:flex;padding:0 20px}
.search-inner input{flex:1;padding:10px 16px;border:2px solid #E63946;border-right:none;border-radius:8px 0 0 8px;font-size:15px;background:#0D1117;color:#F1FAEE;outline:none}
.search-inner input::placeholder{color:#8D99AE}
.search-inner input:focus{border-color:#F4A261}
.search-inner button{padding:10px 24px;background:#E63946;color:#fff;border:2px solid #E63946;border-radius:0 8px 8px 0;font-size:15px;font-weight:600;cursor:pointer;transition:background .3s}
.search-inner button:hover{background:#c62836}

/* Banner */
.hero-banner{position:relative;min-height:560px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.banner-bg{position:absolute;inset:0;background-size:cover;background-position:center;background-repeat:no-repeat}
.banner-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,17,23,.85) 0%,rgba(29,53,87,.7) 50%,rgba(230,57,70,.3) 100%)}
.banner-content{position:relative;z-index:2;text-align:center;max-width:900px;padding:60px 20px}
.banner-title{font-size:48px;font-weight:900;color:#fff;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.5);letter-spacing:4px}
.banner-subtitle{font-size:20px;color:#F4A261;margin-bottom:20px;font-weight:600}
.banner-desc{font-size:16px;color:#ddd;line-height:1.8;margin-bottom:28px}
.banner-btns{display:flex;gap:16px;justify-content:center;margin-bottom:24px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 32px;border-radius:8px;font-size:16px;font-weight:600;transition:all .3s;cursor:pointer;border:2px solid transparent}
.btn-primary{background:#E63946;color:#fff;border-color:#E63946}
.btn-primary:hover{background:#c62836;color:#fff;transform:translateY(-2px);box-shadow:0 4px 16px rgba(230,57,70,.4)}
.btn-outline{background:transparent;color:#F1FAEE;border-color:#F1FAEE}
.btn-outline:hover{background:#F1FAEE;color:#0D1117}
.btn-sm{padding:8px 20px;font-size:14px;border-radius:6px}
.btn-ghost{background:transparent;color:#E63946;border:1px solid #E63946}
.btn-ghost:hover{background:#E63946;color:#fff}
.banner-tags{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.tag{background:rgba(244,162,97,.2);color:#F4A261;padding:4px 14px;border-radius:20px;font-size:13px;border:1px solid rgba(244,162,97,.3)}

/* 面包屑 */
.breadcrumb{background:#1D3557;padding:10px 0;font-size:14px;color:#8D99AE}
.breadcrumb a{color:#F4A261}
.breadcrumb span{margin:0 6px}

/* 通用Section */
.section{padding:60px 0}
.section:nth-child(even){background:#fff}
.section-title{font-size:32px;font-weight:800;text-align:center;margin-bottom:16px;color:#1D3557;position:relative;padding-bottom:16px}
.section-title::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:80px;height:4px;background:linear-gradient(90deg,#E63946,#F4A261);border-radius:2px}
.section-desc{text-align:center;color:#8D99AE;max-width:800px;margin:0 auto 40px;font-size:16px;line-height:1.8}

/* 视频卡片网格 */
.video-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:all .3s}
.video-card:hover{transform:translateY(-6px);box-shadow:0 8px 32px rgba(230,57,70,.15)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9;background:#1D3557}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.play-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.3);opacity:0;transition:opacity .3s}
.video-card:hover .play-overlay{opacity:1}
.play-btn{width:60px;height:60px;background:rgba(230,57,70,.9);border-radius:50%;position:relative}
.play-btn::after{content:'';position:absolute;top:50%;left:55%;transform:translate(-50%,-50%);border-style:solid;border-width:12px 0 12px 20px;border-color:transparent transparent transparent #fff}
.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-tag{position:absolute;top:8px;left:8px;background:#E63946;color:#fff;padding:3px 10px;border-radius:4px;font-size:12px;font-weight:600}
.video-info{padding:16px}
.video-title{font-size:16px;font-weight:700;color:#1D3557;margin-bottom:8px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;font-size:13px;color:#8D99AE;margin-bottom:8px;flex-wrap:wrap}
.video-desc{font-size:14px;color:#666;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* AI模块 */
.section-ai{background:linear-gradient(135deg,#0D1117 0%,#1D3557 100%);color:#F1FAEE}
.section-ai .section-title{color:#F1FAEE}
.section-ai .section-title::after{background:linear-gradient(90deg,#F4A261,#E63946)}
.ai-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-bottom:40px}
.ai-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:28px;text-align:center;transition:all .3s}
.ai-card:hover{background:rgba(230,57,70,.1);border-color:#E63946;transform:translateY(-4px)}
.ai-icon{font-size:40px;margin-bottom:16px}
.ai-card h3{font-size:18px;margin-bottom:12px;color:#F4A261}
.ai-card p{font-size:14px;color:#8D99AE;line-height:1.7}
.ai-banner{border-radius:12px;overflow:hidden;box-shadow:0 4px 24px rgba(0,0,0,.3)}
.ai-banner img{width:100%;height:auto}

/* 社区模块 */
.community-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.community-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:all .3s;text-align:center}
.community-card:hover{transform:translateY(-4px);box-shadow:0 6px 24px rgba(230,57,70,.12)}
.community-card img{width:100%;aspect-ratio:16/9;object-fit:cover}
.community-card h4{padding:12px 16px 4px;font-size:16px;color:#1D3557}
.community-card p{padding:0 16px;font-size:13px;color:#8D99AE;line-height:1.6}
.card-stat{display:block;padding:8px 16px 16px;font-size:13px;color:#E63946;font-weight:600}

/* 专家模块 */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:#fff;border-radius:12px;padding:28px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:all .3s}
.expert-card:hover{transform:translateY(-6px);box-shadow:0 8px 32px rgba(230,57,70,.12)}
.expert-avatar{width:120px;height:120px;border-radius:50%;object-fit:cover;margin:0 auto 16px;border:4px solid #E63946}
.expert-card h4{font-size:18px;color:#1D3557;margin-bottom:4px}
.expert-title{font-size:14px;color:#E63946;font-weight:600;margin-bottom:12px}
.expert-desc{font-size:14px;color:#666;line-height:1.7;margin-bottom:12px}
.expert-tags{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin-bottom:16px}
.expert-tags span{background:#F1FAEE;color:#1D3557;padding:3px 10px;border-radius:12px;font-size:12px}
.expert-actions{display:flex;gap:8px;justify-content:center}

/* 合作品牌 */
.partner-wall{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.partner-item{background:#fff;border:2px solid #eee;border-radius:12px;padding:24px;text-align:center;transition:all .3s}
.partner-item:hover{border-color:#E63946;box-shadow:0 4px 16px rgba(230,57,70,.1)}
.partner-item span{font-size:20px;font-weight:800;color:#1D3557;letter-spacing:2px}

/* How-to步骤 */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.step-card{background:#fff;border-radius:12px;padding:28px;text-align:center;box-shadow:0 2px 12px rgba(0,0,0,.06);position:relative;transition:all .3s}
.step-card:hover{transform:translateY(-4px);box-shadow:0 6px 24px rgba(230,57,70,.1)}
.step-num{font-size:48px;font-weight:900;color:rgba(230,57,70,.15);margin-bottom:12px;line-height:1}
.step-card h4{font-size:18px;color:#1D3557;margin-bottom:10px}
.step-card p{font-size:14px;color:#666;line-height:1.7}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid #e0e0e0;border-radius:10px;margin-bottom:12px;overflow:hidden;transition:all .3s}
.faq-item:hover{border-color:#E63946}
.faq-question{display:flex;justify-content:space-between;align-items:center;padding:18px 24px;cursor:pointer;background:#fff;transition:background .3s}
.faq-question:hover{background:#FFF5F5}
.faq-question h3{font-size:16px;color:#1D3557;font-weight:600;flex:1}
.faq-toggle{font-size:24px;color:#E63946;font-weight:700;transition:transform .3s;min-width:30px;text-align:center}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s ease;background:#FAFAFA}
.faq-answer p{padding:16px 0;font-size:15px;color:#555;line-height:1.8}
.faq-item.active .faq-answer{max-height:300px}
.faq-item.active .faq-toggle{transform:rotate(45deg)}

/* 用户评论 */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:all .3s;border-left:4px solid #E63946}
.review-card:hover{transform:translateY(-4px);box-shadow:0 6px 24px rgba(230,57,70,.1)}
.review-stars{color:#F4A261;font-size:18px;margin-bottom:12px;letter-spacing:2px}
.review-text{font-size:15px;color:#444;line-height:1.8;margin-bottom:16px;font-style:italic}
.review-author{border-top:1px solid #eee;padding-top:12px}
.author-name{font-weight:700;color:#1D3557;font-size:15px;display:block;margin-bottom:4px}
.author-info{font-size:13px;color:#8D99AE}

/* 联系我们 */
.contact-grid{display:grid;grid-template-columns:2fr 1fr;gap:40px;align-items:start}
.contact-info h3{font-size:22px;color:#1D3557;margin-bottom:16px}
.contact-info h4{font-size:18px;color:#1D3557;margin:20px 0 12px}
.info-item{padding:8px 0;font-size:15px;color:#555;border-bottom:1px solid #f0f0f0}
.info-item strong{color:#1D3557}
.contact-qrcodes{display:flex;gap:24px;justify-content:center}
.qrcode-item{text-align:center}
.qrcode-item img{border:2px solid #eee;border-radius:8px;margin-bottom:8px}
.qrcode-item p{font-size:13px;color:#8D99AE}

/* 分享按钮 */
.share-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.share-btn{padding:12px 28px;border-radius:8px;color:#fff;font-size:15px;font-weight:600;transition:all .3s}
.share-btn:hover{transform:translateY(-2px);color:#fff}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#00A1D6}

/* 页脚 */
.site-footer{background:#0D1117;color:#8D99AE;padding:48px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand p{font-size:14px;line-height:1.8;margin-top:12px}
.footer-logo{height:32px;width:auto;margin-bottom:8px}
.footer-links h4,.footer-contact h4{color:#F1FAEE;font-size:16px;margin-bottom:16px}
.footer-links ul{list-style:none}
.footer-links li{margin-bottom:8px}
.footer-links a{color:#8D99AE;font-size:14px;transition:color .3s}
.footer-links a:hover{color:#E63946}
.footer-contact p{font-size:14px;margin-bottom:6px}
.footer-bottom{text-align:center;padding:20px 0;font-size:14px}
.footer-bottom p{margin-bottom:4px}
.footer-qrcodes{display:flex;gap:24px;justify-content:center;padding:16px 0 32px}
.qrcode-small{text-align:center}
.qrcode-small img{border-radius:6px;margin-bottom:4px}
.qrcode-small span{font-size:12px;color:#8D99AE}

/* 移动端适配 */
@media(max-width:1024px){
  .video-grid,.grid-3,.expert-grid,.ai-grid,.partner-wall,.howto-steps{grid-template-columns:repeat(2,1fr)}
  .community-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:64px;left:0;right:0;background:#0D1117;padding:16px;box-shadow:0 4px 12px rgba(0,0,0,.3)}
  .main-nav.active{display:block}
  .nav-list{flex-direction:column;gap:4px}
  .mobile-menu-btn{display:flex}
  .banner-title{font-size:32px}
  .banner-subtitle{font-size:16px}
  .section-title{font-size:24px}
  .video-grid,.grid-3,.community-grid,.expert-grid,.ai-grid,.partner-wall,.howto-steps,.review-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-banner{min-height:420px}
  .contact-qrcodes{flex-direction:column;align-items:center}
  .share-btns{flex-direction:column;align-items:center}
}
@media(max-width:480px){
  .banner-title{font-size:26px;letter-spacing:2px}
  .banner-btns{flex-direction:column;align-items:center}
  .section{padding:40px 0}
  html{font-size:14px}
}

/* 社区6卡片网格 */
.community-grid{grid-template-columns:repeat(3,1fr)}

/* 内容页面样式 */
.page-main{padding:40px 0 60px}
.page-main h1{font-size:32px;font-weight:800;color:#1D3557;margin-bottom:16px;text-align:center}
.page-main h2{font-size:22px;color:#1D3557;margin:32px 0 16px;padding-bottom:8px;border-bottom:2px solid #E63946}
.page-update{text-align:center;color:#8D99AE;font-size:14px;margin-bottom:32px}
.content-block{max-width:800px;margin:0 auto}
.content-block p{font-size:15px;color:#555;line-height:1.9;margin-bottom:16px}
.content-block ul{padding-left:24px;margin-bottom:16px}
.content-block li{font-size:15px;color:#555;line-height:1.9;margin-bottom:8px}

/* 懒加载占位 */



/* 搜索结果弹窗 */
.search-modal{display:none;position:fixed;inset:0;z-index:2000;background:rgba(0,0,0,.7);align-items:center;justify-content:center}
.search-modal.active{display:flex}
.search-modal-content{background:#fff;border-radius:12px;padding:32px;max-width:500px;width:90%;text-align:center}
.search-modal-content h3{color:#1D3557;margin-bottom:12px}
.search-modal-content p{color:#666;margin-bottom:20px}
.search-modal-close{background:#E63946;color:#fff;border:none;padding:10px 24px;border-radius:6px;cursor:pointer;font-size:15px}