/* ============================================
   在线看片 修车改装视频社区 - 全站样式表
   品牌色系：藏蓝 #1A1A2E | 赛车红 #E94560 | 机油金 #F5A623
   ============================================ */

/* === 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:#0F0F1A;color:#EAEAEA;line-height:1.8;overflow-x:hidden}
a{color:#F5A623;text-decoration:none;transition:color .3s}
a:hover{color:#E94560}
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:#fff}

/* === 容器 === */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section-wrap{padding:60px 0}

/* === 顶部导航 === */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(15,15,26,.95);backdrop-filter:blur(12px);border-bottom:1px solid rgba(233,69,96,.15);transition:all .3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px;max-width:1200px;margin:0 auto;padding:0 20px}
.logo-link{display:flex;align-items:center;gap:10px}
.logo-link img{height:42px;width:auto}
.logo-text{font-size:22px;font-weight:800;color:#E94560;letter-spacing:2px}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{padding:8px 14px;font-size:14px;color:#EAEAEA;border-radius:6px;transition:all .3s;white-space:nowrap}
.main-nav a:hover,.main-nav a.active{background:rgba(233,69,96,.15);color:#E94560}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:2px;background:#EAEAEA;transition:all .3s}

/* === 搜索框 === */
.search-bar{background:rgba(26,26,46,.9);border-bottom:1px solid rgba(245,166,35,.1);padding:12px 0}
.search-bar-inner{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;justify-content:center}
.search-form{display:flex;width:100%;max-width:600px;position:relative}
.search-form input{flex:1;padding:10px 18px;border:2px solid rgba(233,69,96,.3);border-radius:25px 0 0 25px;background:rgba(22,33,62,.8);color:#EAEAEA;font-size:14px;outline:none;transition:border-color .3s}
.search-form input:focus{border-color:#E94560}
.search-form input::placeholder{color:rgba(234,234,234,.4)}
.search-form button{padding:10px 24px;background:linear-gradient(135deg,#E94560,#c73550);color:#fff;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:14px;transition:all .3s;white-space:nowrap}
.search-form button:hover{background:linear-gradient(135deg,#F5A623,#d48e1a)}

/* === Banner === */
.hero-banner{position:relative;height:520px;overflow:hidden}
.hero-banner img{width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,15,26,.3) 0%,rgba(15,15,26,.85) 100%);display:flex;align-items:center;justify-content:center}
.hero-content{text-align:center;max-width:800px;padding:0 20px}
.hero-content h1{font-size:42px;margin-bottom:16px;text-shadow:0 2px 20px rgba(233,69,96,.4)}
.hero-content h1 .brand-highlight{color:#E94560}
.hero-content p{font-size:18px;color:rgba(234,234,234,.85);margin-bottom:24px;line-height:1.8}
.hero-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:16px}
.hero-tags span{padding:6px 16px;background:rgba(233,69,96,.15);border:1px solid rgba(233,69,96,.3);border-radius:20px;font-size:13px;color:#F5A623}

/* === 通用标题 === */
.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::after{content:'';display:block;width:60px;height:3px;background:linear-gradient(90deg,#E94560,#F5A623);margin:12px auto 0;border-radius:2px}
.section-title p{color:rgba(234,234,234,.6);font-size:15px;margin-top:8px}

/* === 视频卡片 === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:#16213E;border-radius:12px;overflow:hidden;transition:transform .3s,box-shadow .3s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(233,69,96,.2)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden}
.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)}
.play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;background:rgba(15,15,26,.5)}
.video-card:hover .play-btn{opacity:1}
.play-btn svg{width:56px;height:56px;fill:#E94560;filter:drop-shadow(0 2px 8px rgba(233,69,96,.5))}
.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;font-weight:600;z-index:2}
.video-info{padding:16px}
.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:14px;font-size:12px;color:rgba(234,234,234,.5)}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;padding:3px 10px;background:rgba(245,166,35,.12);color:#F5A623;border-radius:10px;font-size:11px;margin-top:8px}

/* === 专家展示 === */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:#16213E;border-radius:12px;padding:24px;text-align:center;transition:transform .3s,box-shadow .3s}
.expert-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(233,69,96,.15)}
.expert-avatar{width:100px;height:100px;border-radius:50%;margin:0 auto 16px;overflow:hidden;border:3px solid rgba(233,69,96,.3)}
.expert-avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h4{font-size:18px;margin-bottom:4px}
.expert-card .role{color:#F5A623;font-size:13px;margin-bottom:12px}
.expert-card p{font-size:13px;color:rgba(234,234,234,.6);line-height:1.7;margin-bottom:16px}
.expert-certs{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:12px}
.cert-badge{display:inline-block;padding:4px 12px;background:rgba(245,166,35,.1);border:1px solid rgba(245,166,35,.25);border-radius:16px;font-size:11px;color:#F5A623}
.expert-actions{display:flex;gap:10px;justify-content:center}
.btn-sm{padding:7px 18px;border-radius:20px;font-size:12px;border:1px solid rgba(233,69,96,.4);color:#E94560;transition:all .3s;cursor:pointer;background:transparent}
.btn-sm:hover{background:#E94560;color:#fff}

/* === 合作品牌墙 === */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.brand-wall-item{width:140px;height:60px;background:rgba(22,33,62,.8);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;color:rgba(234,234,234,.4);border:1px solid rgba(234,234,234,.08);transition:all .3s}
.brand-wall-item:hover{border-color:rgba(233,69,96,.3);color:#F5A623}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#16213E;border-radius:10px;margin-bottom:12px;overflow:hidden;border:1px solid rgba(233,69,96,.08)}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:15px;font-weight:600;transition:background .3s}
.faq-question:hover{background:rgba(233,69,96,.05)}
.faq-question .arrow{transition:transform .3s;color:#E94560;font-size:18px}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px}
.faq-item.active .faq-answer{max-height:300px;padding:0 24px 18px}
.faq-answer p{font-size:14px;color:rgba(234,234,234,.7);line-height:1.8}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:#16213E;border-radius:12px;padding:24px;border-left:3px solid #E94560}
.review-card .stars{color:#F5A623;font-size:14px;margin-bottom:10px;letter-spacing:2px}
.review-card blockquote{font-size:14px;color:rgba(234,234,234,.75);line-height:1.8;margin-bottom:14px;font-style:italic}
.review-card .reviewer{font-size:13px;color:rgba(234,234,234,.5)}

/* === AI赋能 === */
.ai-features{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.ai-card{background:linear-gradient(135deg,rgba(22,33,62,.9),rgba(26,26,46,.9));border-radius:12px;padding:28px;border:1px solid rgba(233,69,96,.1);transition:all .3s}
.ai-card:hover{border-color:rgba(233,69,96,.3);box-shadow:0 0 30px rgba(233,69,96,.1)}
.ai-card .icon{font-size:36px;margin-bottom:14px}
.ai-card h4{font-size:17px;margin-bottom:10px;color:#F5A623}
.ai-card p{font-size:13px;color:rgba(234,234,234,.65);line-height:1.7}

/* === 社区模块 === */
.community-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px}
.community-item{background:#16213E;border-radius:10px;padding:20px;text-align:center;transition:all .3s;border:1px solid rgba(233,69,96,.06)}
.community-item:hover{border-color:rgba(245,166,35,.3);transform:translateY(-3px)}
.community-item .icon{font-size:32px;margin-bottom:10px}
.community-item h5{font-size:14px;margin-bottom:6px}
.community-item p{font-size:12px;color:rgba(234,234,234,.5)}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.contact-card{background:#16213E;border-radius:12px;padding:24px;text-align:center}
.contact-card h4{font-size:16px;margin-bottom:12px;color:#F5A623}
.contact-card p{font-size:13px;color:rgba(234,234,234,.65);line-height:1.8}
.contact-card img{max-width:150px;margin:12px auto 0;border-radius:8px}

/* === 社交分享 === */
.share-bar{display:flex;justify-content:center;gap:16px;padding:20px 0}
.share-btn{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;color:#fff;transition:all .3s;cursor:pointer}
.share-btn.wechat{background:#07C160}
.share-btn.weibo{background:#E6162D}
.share-btn.douyin{background:#161823}
.share-btn.bilibili{background:#00A1D6}
.share-btn:hover{transform:scale(1.15);box-shadow:0 4px 15px rgba(0,0,0,.3)}

/* === 面包屑 === */
.breadcrumb{padding:14px 0;font-size:13px;color:rgba(234,234,234,.5)}
.breadcrumb a{color:#F5A623}
.breadcrumb span{margin:0 6px}

/* === 按钮 === */
.btn-primary{display:inline-block;padding:12px 32px;background:linear-gradient(135deg,#E94560,#c73550);color:#fff;border-radius:25px;font-size:15px;font-weight:600;transition:all .3s;border:none;cursor:pointer}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(233,69,96,.4);color:#fff}
.btn-outline{display:inline-block;padding:10px 28px;border:2px solid #E94560;color:#E94560;border-radius:25px;font-size:14px;transition:all .3s;cursor:pointer;background:transparent}
.btn-outline:hover{background:#E94560;color:#fff}

/* === 页脚 === */
.site-footer{background:#0a0a14;border-top:1px solid rgba(233,69,96,.1);padding:40px 0 20px}
.footer-top{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:30px}
.footer-col h4{font-size:16px;margin-bottom:14px;color:#E94560}
.footer-col p,.footer-col a{font-size:13px;color:rgba(234,234,234,.55);line-height:2}
.footer-col a:hover{color:#F5A623}
.footer-qr{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;margin:20px 0}
.footer-qr-item{text-align:center}
.footer-qr-item img{width:120px;height:120px;border-radius:8px;margin-bottom:6px}
.footer-qr-item span{font-size:12px;color:rgba(234,234,234,.4)}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(234,234,234,.06);font-size:12px;color:rgba(234,234,234,.35)}

/* === How-To指南 === */
.howto-steps{max-width:700px;margin:0 auto}
.howto-step{display:flex;gap:18px;margin-bottom:24px;align-items:flex-start}
.step-num{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#E94560,#F5A623);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:800;color:#fff;flex-shrink:0}
.step-content h4{font-size:15px;margin-bottom:4px}
.step-content p{font-size:13px;color:rgba(234,234,234,.6)}

/* === 内页通用 === */
.page-hero{margin-top:70px;padding:60px 0;background:linear-gradient(135deg,#1A1A2E,#16213E);text-align:center}
.page-hero h1{font-size:36px;margin-bottom:10px}
.page-hero p{color:rgba(234,234,234,.6);font-size:15px}

/* === 响应式 === */
@media(max-width:768px){
  .header-inner{height:60px}
  .main-nav{position:fixed;top:60px;left:0;width:100%;background:rgba(15,15,26,.98);flex-direction:column;padding:20px;gap:4px;transform:translateY(-120%);transition:transform .3s;border-bottom:1px solid rgba(233,69,96,.15)}
  .main-nav.open{transform:translateY(0)}
  .main-nav a{padding:12px 16px;width:100%;text-align:center}
  .nav-toggle{display:flex}
  .hero-banner{height:360px}
  .hero-content h1{font-size:26px}
  .hero-content p{font-size:14px}
  .section-wrap{padding:40px 0}
  .section-title h2{font-size:24px}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
  .expert-grid{grid-template-columns:1fr 1fr}
  .footer-top{grid-template-columns:1fr}
  .search-form{max-width:100%}
  .ai-features{grid-template-columns:1fr}
  .community-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
  .brand-wall-item{width:110px;font-size:12px}
}
@media(max-width:480px){
  .expert-grid{grid-template-columns:1fr}
  .video-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .hero-banner{height:280px}
  .hero-content h1{font-size:22px}
}

/* === 懒加载 === */
img[data-src]{opacity:0;transition:opacity .5s}
img.loaded{opacity:1}

/* === 动画 === */
.fade-in{opacity:0;transform:translateY(20px);transition:all .6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}