/* 午夜福利 - 汽车改装视频社区 全站样式 */
/* bntppcc.cn */

/* ========== Reset & Base ========== */
*,*::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;color:#222;background:#f8f9fa;line-height:1.7;overflow-x:hidden}
a{color:#e8590c;text-decoration:none;transition:color .3s}
a:hover{color:#d9480f}
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:#1a1a2e}

/* ========== Container ========== */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section-wrap{padding:60px 0}
.section-wrap:nth-child(even){background:#fff}

/* ========== Header ========== */
.site-header{background:#1a1a2e;position:sticky;top:0;z-index:1000;box-shadow:0 2px 12px rgba(0,0,0,.15)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:1200px;margin:0 auto}
.site-logo{display:flex;align-items:center;gap:10px}
.site-logo img{height:42px;width:auto}
.site-logo span{color:#fff;font-size:22px;font-weight:700;letter-spacing:1px}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{color:#ccc;padding:10px 16px;font-size:15px;transition:all .3s;border-bottom:2px solid transparent}
.main-nav a:hover,.main-nav a.active{color:#e8590c;border-bottom-color:#e8590c}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:26px;cursor:pointer}

/* ========== Search Bar ========== */
.search-bar-wrap{background:#16213e;padding:10px 0}
.search-bar{max-width:600px;margin:0 auto;display:flex;gap:8px;padding:0 20px}
.search-bar input{flex:1;padding:10px 16px;border:none;border-radius:6px;font-size:14px;background:#fff;outline:none}
.search-bar button{padding:10px 24px;background:#e8590c;color:#fff;border:none;border-radius:6px;font-size:14px;cursor:pointer;transition:background .3s}
.search-bar button:hover{background:#d9480f}

/* ========== Hero Banner ========== */
.hero-banner{position:relative;height:480px;overflow:hidden;background:#1a1a2e}
.hero-banner img{width:100%;height:100%;object-fit:cover;opacity:.7}
.hero-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:flex-start;padding:0 60px;background:linear-gradient(90deg,rgba(26,26,46,.85) 0%,rgba(26,26,46,.3) 100%)}
.hero-overlay h1{color:#fff;font-size:42px;margin-bottom:12px;text-shadow:0 2px 8px rgba(0,0,0,.3)}
.hero-overlay h1 span{color:#e8590c}
.hero-overlay p{color:#ddd;font-size:18px;max-width:560px;margin-bottom:24px}
.hero-overlay .hero-tags{display:flex;gap:10px;flex-wrap:wrap}
.hero-overlay .hero-tags span{background:rgba(232,89,12,.8);color:#fff;padding:5px 14px;border-radius:20px;font-size:13px}
.btn-primary{display:inline-block;padding:12px 32px;background:#e8590c;color:#fff;border-radius:6px;font-size:16px;font-weight:600;transition:all .3s;border:none;cursor:pointer}
.btn-primary:hover{background:#d9480f;transform:translateY(-2px);box-shadow:0 4px 12px rgba(232,89,12,.4)}
.btn-outline{display:inline-block;padding:10px 28px;border:2px solid #e8590c;color:#e8590c;border-radius:6px;font-size:14px;font-weight:600;transition:all .3s;background:transparent}
.btn-outline:hover{background:#e8590c;color:#fff}

/* ========== Section Titles ========== */
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:32px;margin-bottom:8px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:3px;background:#e8590c;margin:10px auto 0}
.section-title p{color:#666;font-size:15px;margin-top:8px}

/* ========== Video Card ========== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:#fff;border-radius:10px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.08);transition:all .3s;position:relative}
.video-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.12)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#222}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.video-play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;background:rgba(0,0,0,.35)}
.video-card:hover .video-play-btn{opacity:1}
.video-play-btn span{width:56px;height:56px;background:rgba(232,89,12,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:0}
.video-play-btn span::after{content:'';display:block;width:0;height:0;border-left:20px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:4px}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px}
.video-info{padding:14px 16px}
.video-info h3{font-size:15px;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;align-items:center;gap:12px;color:#888;font-size:13px}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;background:#fff3e0;color:#e8590c;padding:2px 8px;border-radius:3px;font-size:12px;margin-right:4px}

/* ========== Module Cards ========== */
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.module-card{background:#fff;border-radius:10px;padding:28px 24px;text-align:center;box-shadow:0 2px 10px rgba(0,0,0,.06);transition:all .3s;border:1px solid #eee}
.module-card:hover{border-color:#e8590c;transform:translateY(-3px);box-shadow:0 6px 20px rgba(232,89,12,.1)}
.module-card .icon{font-size:40px;margin-bottom:14px;display:block}
.module-card h4{font-size:17px;margin-bottom:8px;color:#1a1a2e}
.module-card p{color:#666;font-size:14px;line-height:1.6}

/* ========== Expert Section ========== */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:#fff;border-radius:10px;padding:24px;text-align:center;box-shadow:0 2px 10px rgba(0,0,0,.06);transition:all .3s}
.expert-card:hover{box-shadow:0 6px 20px rgba(0,0,0,.1)}
.expert-avatar{width:80px;height:80px;border-radius:50%;margin:0 auto 14px;background:#e8590c;display:flex;align-items:center;justify-content:center;font-size:32px;color:#fff}
.expert-card h4{font-size:17px;margin-bottom:4px}
.expert-card .role{color:#e8590c;font-size:13px;margin-bottom:10px;display:block}
.expert-card p{color:#666;font-size:13px;line-height:1.6;margin-bottom:14px}
.expert-card .expert-btns{display:flex;gap:8px;justify-content:center}

/* ========== Partner Wall ========== */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.partner-wall .partner-item{background:#fff;padding:16px 28px;border-radius:8px;box-shadow:0 1px 6px rgba(0,0,0,.06);font-size:16px;font-weight:600;color:#555;transition:all .3s}
.partner-wall .partner-item:hover{color:#e8590c;box-shadow:0 4px 12px rgba(232,89,12,.12)}

/* ========== FAQ ========== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:8px;margin-bottom:12px;box-shadow:0 1px 6px rgba(0,0,0,.05);overflow:hidden}
.faq-question{padding:18px 24px;font-size:15px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .3s}
.faq-question:hover{background:#fff8f0}
.faq-question::after{content:'+';font-size:20px;color:#e8590c;transition:transform .3s}
.faq-item.active .faq-question::after{transform:rotate(45deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .3s;color:#555;font-size:14px;line-height:1.7}
.faq-item.active .faq-answer{padding:0 24px 18px;max-height:500px}

/* ========== Reviews ========== */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:#fff;border-radius:10px;padding:24px;box-shadow:0 2px 10px rgba(0,0,0,.06)}
.review-card .stars{color:#f59f00;font-size:16px;margin-bottom:10px}
.review-card blockquote{font-size:14px;color:#555;line-height:1.7;margin-bottom:12px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer-avatar{width:36px;height:36px;border-radius:50%;background:#e8590c;display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;font-weight:700}
.review-card .reviewer-info{font-size:13px}
.review-card .reviewer-info strong{display:block;color:#333}
.review-card .reviewer-info span{color:#888}

/* ========== Contact Section ========== */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px}
.contact-card{background:#fff;border-radius:10px;padding:24px;text-align:center;box-shadow:0 2px 10px rgba(0,0,0,.06)}
.contact-card .icon{font-size:36px;margin-bottom:10px;display:block}
.contact-card h4{font-size:16px;margin-bottom:6px}
.contact-card p{color:#666;font-size:14px}

/* ========== Share Buttons ========== */
.share-bar{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;padding:20px 0}
.share-btn{padding:8px 20px;border-radius:20px;font-size:13px;color:#fff;transition:all .3s;cursor:pointer;border:none}
.share-btn:hover{transform:translateY(-2px);opacity:.9}
.share-btn.wechat{background:#07c160}
.share-btn.weibo{background:#e6162d}
.share-btn.douyin{background:#161823}
.share-btn.bilibili{background:#00a1d6}

/* ========== Footer ========== */
.site-footer{background:#1a1a2e;color:#aaa;padding:40px 0 20px}
.footer-inner{max-width:1200px;margin:0 auto;padding:0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;margin-bottom:30px}
.footer-col h5{color:#fff;font-size:16px;margin-bottom:14px;position:relative;padding-bottom:8px}
.footer-col h5::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:#e8590c}
.footer-col p,.footer-col a{color:#aaa;font-size:13px;line-height:2}
.footer-col a:hover{color:#e8590c}
.footer-col img{max-width:120px;border-radius:6px;margin-top:6px}
.footer-bottom{border-top:1px solid #2a2a4a;padding-top:16px;text-align:center;font-size:13px}
.footer-bottom p{margin-bottom:4px}

/* ========== Breadcrumb ========== */
.breadcrumb{padding:12px 0;font-size:13px;color:#888}
.breadcrumb a{color:#666}
.breadcrumb a:hover{color:#e8590c}
.breadcrumb span{margin:0 6px;color:#ccc}

/* ========== Inner Page ========== */
.page-hero{background:#1a1a2e;padding:50px 0;text-align:center}
.page-hero h1{color:#fff;font-size:34px;margin-bottom:8px}
.page-hero p{color:#aaa;font-size:15px}

/* ========== How-to Guide ========== */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px;counter-reset:step}
.howto-step{background:#fff;border-radius:10px;padding:24px;box-shadow:0 2px 10px rgba(0,0,0,.06);position:relative;counter-increment:step}
.howto-step::before{content:counter(step);position:absolute;top:-12px;left:20px;width:32px;height:32px;background:#e8590c;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px}
.howto-step h4{margin-top:8px;margin-bottom:8px;font-size:16px}
.howto-step p{color:#666;font-size:14px}

/* ========== AI Section ========== */
.ai-feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.ai-card{background:linear-gradient(135deg,#1a1a2e 0%,#16213e 100%);border-radius:12px;padding:28px;color:#fff;transition:all .3s}
.ai-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.2)}
.ai-card .icon{font-size:36px;margin-bottom:12px;display:block}
.ai-card h4{font-size:18px;margin-bottom:8px;color:#fff}
.ai-card p{color:#aaa;font-size:14px;line-height:1.7}

/* ========== Community Tabs ========== */
.tab-nav{display:flex;gap:4px;margin-bottom:24px;flex-wrap:wrap;justify-content:center}
.tab-nav button{padding:8px 20px;border:2px solid #ddd;background:#fff;border-radius:20px;font-size:14px;cursor:pointer;transition:all .3s;color:#555}
.tab-nav button:hover,.tab-nav button.active{border-color:#e8590c;color:#e8590c;background:#fff8f0}

/* ========== Responsive ========== */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}
  .main-nav.show{display:flex}
  .nav-toggle{display:block}
  .hero-banner{height:320px}
  .hero-overlay{padding:0 24px}
  .hero-overlay h1{font-size:26px}
  .hero-overlay p{font-size:14px}
  .section-title h2{font-size:24px}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
  .search-bar{flex-direction:column}
}
@media(max-width:480px){
  .hero-banner{height:260px}
  .video-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .module-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
}

/* ========== Pricing Section ========== */
.module-card p[style*="font-size:28px"]{letter-spacing:1px}

/* ========== Yandex Mobile Optimization ========== */
/* Yandex requires minimum 12px font on mobile */
@media(max-width:768px){
  body{font-size:14px}
  .video-duration{font-size:12px}
  .video-tag{font-size:12px}
  .video-meta span{font-size:12px}
  .footer-col p,.footer-col a{font-size:12px}
  .breadcrumb{font-size:12px}
  .review-card .reviewer-info{font-size:12px}
  .expert-card p{font-size:12px}
  .expert-card .role{font-size:12px}
}

/* ========== Performance Optimization ========== */
img{content-visibility:auto}
.video-card{contain:layout style}

/* ========== Interference Tags (Hidden) ========== */
.kkt-h{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;padding:0;margin:-1px}