/* =============================================
   抖音风修车改装视频社区 - 原创样式
   gw8ii2c.cn
   配色：赛车红 + 碳纤维黑 + 警示橙
   ============================================= */

/* ---- CSS变量 ---- */
:root {
    --bg-deep: #0A0C10;
    --bg-main: #0D0F14;
    --bg-card: #14171E;
    --bg-card-hover: #1A1E28;
    --border-color: rgba(232,53,15,0.12);
    --border-light: rgba(232,53,15,0.06);
    --red: #E8350F;
    --red-light: #FF5733;
    --red-dark: #B82A0C;
    --orange: #F5A623;
    --orange-light: #FFD080;
    --steel: #2A2E38;
    --text-main: #F0F0F2;
    --text-sub: #9CA3AF;
    --text-muted: #6B7280;
    --radius: 10px;
    --radius-lg: 16px;
    --shadow: 0 4px 24px rgba(0,0,0,0.4);
    --shadow-hover: 0 8px 40px rgba(232,53,15,0.15);
    --transition: .3s ease;
}

/* ---- Reset ---- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;background:var(--bg-main);color:var(--text-main);line-height:1.7;overflow-x:hidden}
a{color:var(--red-light);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--orange)}
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}

/* ---- 容器 ---- */
.wrapper{max-width:1280px;margin:0 auto;padding:0 20px}

/* ---- 顶部信息栏 ---- */
.topbar{background:var(--bg-deep);border-bottom:1px solid var(--border-color);padding:6px 0;font-size:13px;color:var(--text-muted)}
.topbar .wrapper{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px}
.topbar a{color:var(--text-muted)}
.topbar a:hover{color:var(--orange)}

/* ---- 导航栏 ---- */
.navbar{background:rgba(13,15,20,0.95);backdrop-filter:blur(12px);position:sticky;top:0;z-index:1000;border-bottom:1px solid var(--border-color);padding:0}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:22px;color:var(--text-main)}
.nav-logo img{width:40px;height:40px;border-radius:8px}
.nav-logo .brand-91{color:var(--red);font-size:26px;font-weight:900}
.nav-menu{display:flex;gap:4px;align-items:center}
.nav-menu a{padding:8px 16px;border-radius:var(--radius);font-size:15px;font-weight:500;color:var(--text-sub);transition:all var(--transition)}
.nav-menu a:hover,.nav-menu a.active{color:var(--text-main);background:rgba(232,53,15,0.1)}
.nav-toggle{display:none;background:none;border:none;color:var(--text-main);font-size:24px;cursor:pointer;padding:8px}

/* ---- 搜索栏 ---- */
.search-strip{background:var(--bg-deep);border-bottom:1px solid var(--border-color);padding:12px 0}
.search-box{display:flex;max-width:640px;margin:0 auto;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius);overflow:hidden}
.search-box input{flex:1;background:transparent;border:none;padding:10px 16px;color:var(--text-main);font-size:15px;outline:none}
.search-box input::placeholder{color:var(--text-muted)}
.search-box button{background:var(--red);color:#fff;border:none;padding:10px 24px;font-size:15px;cursor:pointer;transition:background var(--transition);white-space:nowrap}
.search-box button:hover{background:var(--red-dark)}
.search-tags{display:flex;gap:8px;justify-content:center;margin-top:8px;flex-wrap:wrap}
.search-tags a{font-size:12px;color:var(--text-muted);background:var(--steel);padding:3px 10px;border-radius:20px;transition:all var(--transition)}
.search-tags a:hover{color:var(--text-main);background:var(--red)}

/* ---- Hero Banner ---- */
.hero{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(10,12,16,0.92) 0%,rgba(10,12,16,0.6) 50%,rgba(232,53,15,0.15) 100%);z-index:1}
.hero-content{position:relative;z-index:2;max-width:680px;padding:60px 0}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(232,53,15,0.15);border:1px solid rgba(232,53,15,0.3);padding:6px 16px;border-radius:20px;font-size:13px;color:var(--red-light);margin-bottom:20px}
.hero h1{font-size:42px;margin-bottom:16px;line-height:1.2}
.hero h1 .hl{color:var(--red)}
.hero-desc{font-size:17px;color:var(--text-sub);margin-bottom:28px;line-height:1.8}
.hero-stats{display:flex;gap:32px;margin-bottom:28px}
.hero-stat .num{font-size:30px;font-weight:800;color:var(--orange)}
.hero-stat .label{font-size:13px;color:var(--text-muted)}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
.btn-red{display:inline-flex;align-items:center;gap:6px;background:var(--red);color:#fff;padding:12px 28px;border-radius:var(--radius);font-weight:600;font-size:15px;transition:all var(--transition);border:none;cursor:pointer}
.btn-red:hover{background:var(--red-dark);transform:translateY(-2px);box-shadow:0 6px 20px rgba(232,53,15,0.3);color:#fff}
.btn-outline{display:inline-flex;align-items:center;gap:6px;background:transparent;color:var(--text-main);padding:12px 28px;border-radius:var(--radius);font-weight:600;font-size:15px;border:1px solid var(--border-color);transition:all var(--transition);cursor:pointer}
.btn-outline:hover{border-color:var(--red);color:var(--red);transform:translateY(-2px)}

/* ---- 通用Section ---- */
.section{padding:64px 0}
.bjj2ljwf{text-align:center;margin-bottom:48px}
.bjj2ljwf h2{font-size:32px;margin-bottom:12px}
.bjj2ljwf h2 .hl{color:var(--red)}
.bjj2ljwf p{color:var(--text-sub);font-size:16px;max-width:600px;margin:0 auto}
.g6le28{width:60px;height:3px;background:linear-gradient(90deg,var(--red),var(--orange));margin:16px auto 0;border-radius:2px}

/* ---- 视频卡片网格 ---- */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border-color);transition:all var(--transition);cursor:pointer}
.video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:rgba(232,53,15,0.3)}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.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(0,0,0,0.3);opacity:0;transition:opacity var(--transition)}
.video-card:hover .play-overlay{opacity:1}
.play-btn{width:56px;height:56px;background:rgba(232,53,15,0.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform var(--transition)}
.play-btn::after{content:'';width:0;height:0;border-left:20px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:4px}
.video-card:hover .play-btn{transform:scale(1.1)}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,0.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px;font-weight:600}
.video-info{padding:16px}
.video-title{font-size:15px;font-weight:600;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:var(--text-muted);flex-wrap:wrap}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;background:rgba(232,53,15,0.1);color:var(--red-light);padding:2px 8px;border-radius:4px;font-size:11px;margin-top:8px}

/* ---- 特色模块网格 ---- */
.wt5g1kqn{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ctcfs2{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:32px 24px;text-align:center;transition:all var(--transition)}
.ctcfs2:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:rgba(232,53,15,0.3)}
.e1zxc{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,var(--red),var(--orange));border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:28px}
.ctcfs2 h3{font-size:18px;margin-bottom:8px}
.ctcfs2 p{color:var(--text-sub);font-size:14px;line-height:1.6}

/* ---- 专家展示 ---- */
.kzjd9{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.b1r9p3k{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:28px 20px;text-align:center;transition:all var(--transition)}
.b1r9p3k:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.kne900{width:80px;height:80px;border-radius:50%;margin:0 auto 12px;background:linear-gradient(135deg,var(--red),var(--orange));display:flex;align-items:center;justify-content:center;font-size:32px;font-weight:800;color:#fff}
.p87dg{font-size:17px;font-weight:700;margin-bottom:4px}
.y3rz3i79{font-size:13px;color:var(--red-light);margin-bottom:8px}
.ck6qwo{font-size:13px;color:var(--text-sub);line-height:1.6;margin-bottom:12px}
.rqfm0ck{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;margin-bottom:12px}
.o4n93{font-size:11px;background:var(--steel);color:var(--text-muted);padding:2px 8px;border-radius:12px}
.vcflby{display:flex;gap:8px;justify-content:center}
.btn-sm{padding:6px 14px;font-size:12px;border-radius:6px;border:1px solid var(--border-color);color:var(--text-sub);background:transparent;cursor:pointer;transition:all var(--transition)}
.btn-sm:hover{border-color:var(--red);color:var(--red)}
.btn-sm-red{padding:6px 14px;font-size:12px;border-radius:6px;border:none;color:#fff;background:var(--red);cursor:pointer;transition:all var(--transition)}
.btn-sm-red:hover{background:var(--red-dark)}

/* ---- 合作品牌墙 ---- */
.hoyq7bk{display:grid;grid-template-columns:repeat(6,1fr);gap:20px}
.wwpdf7{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius);padding:24px 16px;text-align:center;transition:all var(--transition);display:flex;align-items:center;justify-content:center;min-height:80px}
.wwpdf7:hover{border-color:var(--red);transform:translateY(-2px)}
.wwpdf7 span{font-size:15px;font-weight:700;color:var(--text-sub)}

/* ---- 用户评价 ---- */
.rkmuu0nd{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.je49v{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:28px}
.je49v:hover{border-color:rgba(232,53,15,0.3)}
.kft6y59{color:var(--orange);font-size:16px;margin-bottom:12px;letter-spacing:2px}
.nw3wa{font-size:14px;color:var(--text-sub);line-height:1.8;margin-bottom:16px;font-style:italic}
.r8zolyy{display:flex;align-items:center;gap:12px}
.hwqc4{width:40px;height:40px;border-radius:50%;background:var(--steel);display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700;color:var(--text-main)}
.b92h1b32{font-size:14px;font-weight:600}
.pm7e8{font-size:12px;color:var(--text-muted)}

/* ---- FAQ ---- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.faq-q{padding:18px 24px;font-weight:600;font-size:15px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background var(--transition)}
.faq-q:hover{background:var(--bg-card-hover)}
.faq-icon{font-size:20px;color:var(--red);transition:transform var(--transition);flex-shrink:0}
.faq-a{padding:0 24px 18px;font-size:14px;color:var(--text-sub);line-height:1.8;display:none}
.faq-item.open .faq-a{display:block}
.faq-item.open .faq-icon{transform:rotate(45deg)}

/* ---- How-To指南 ---- */
.qjqt8ei{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.zk4du9x{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:28px 20px;text-align:center;position:relative}
.knjmf2{width:40px;height:40px;background:var(--red);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;margin:0 auto 16px}
.zk4du9x h4{font-size:16px;margin-bottom:8px}
.zk4du9x p{font-size:13px;color:var(--text-sub);line-height:1.6}

/* ---- 社交分享 ---- */
.share-section{background:var(--bg-deep);padding:40px 0;text-align:center}
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:16px}
.share-btn{width:48px;height:48px;border-radius:50%;border:1px solid var(--border-color);background:var(--bg-card);color:var(--text-sub);display:flex;align-items:center;justify-content:center;font-size:18px;cursor:pointer;transition:all var(--transition)}
.share-btn:hover{background:var(--red);color:#fff;border-color:var(--red);transform:translateY(-2px)}

/* ---- 联系信息 ---- */
.fwk43b{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.jvnn1gh{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:28px;text-align:center}
.g7lf9dc7{font-size:32px;margin-bottom:12px}
.jvnn1gh h4{font-size:16px;margin-bottom:8px}
.jvnn1gh p{font-size:14px;color:var(--text-sub);line-height:1.6}

/* ---- 页脚 ---- */
.footer{background:var(--bg-deep);border-top:1px solid var(--border-color);padding:48px 0 0}
.ymhgen9i{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
.bqpqe p{color:var(--text-sub);font-size:14px;line-height:1.7;margin-top:12px}
.na9jjl h4{font-size:15px;margin-bottom:16px;color:var(--text-main)}
.na9jjl a{display:block;color:var(--text-muted);font-size:14px;padding:4px 0;transition:color var(--transition)}
.na9jjl a:hover{color:var(--red-light)}
.x0gta96{display:flex;gap:16px;margin-top:16px}
.lkww5{text-align:center}
.lkww5 img{width:100px;height:100px;border-radius:8px;border:1px solid var(--border-color)}
.lkww5 span{display:block;font-size:11px;color:var(--text-muted);margin-top:4px}
.hh1xx{border-top:1px solid var(--border-color);padding:20px 0;text-align:center;font-size:13px;color:var(--text-muted)}

/* ---- 面包屑 ---- */
.breadcrumb{padding:16px 0;font-size:13px;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--red-light)}
.breadcrumb .sep{margin:0 8px}

/* ---- 内页Hero ---- */
.page-hero{position:relative;padding:48px 0;background:var(--bg-deep);border-bottom:1px solid var(--border-color)}
.page-hero h1{font-size:36px;margin-bottom:8px}
.page-hero p{color:var(--text-sub);font-size:16px}

/* ---- 文章内容 ---- */
.article-body{max-width:900px;margin:0 auto;padding:40px 0}
.article-body p{margin-bottom:16px;line-height:1.9;color:var(--text-sub);font-size:15px}
.article-body h2,.article-body h3{margin:32px 0 16px;color:var(--text-main)}
.article-body img{border-radius:var(--radius);margin:24px 0}

/* ---- 返回顶部 ---- */
.back-to-top{position:fixed;bottom:32px;right:32px;width:44px;height:44px;background:var(--red);color:#fff;border:none;border-radius:50%;font-size:20px;cursor:pointer;opacity:0;visibility:hidden;transition:all var(--transition);z-index:999;display:flex;align-items:center;justify-content:center}
.back-to-top.visible{opacity:1;visibility:visible}
.back-to-top:hover{background:var(--red-dark);transform:translateY(-3px)}

/* ---- 社区话题卡片 ---- */
.zjshyk{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.r42882w{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius);padding:20px;transition:all var(--transition)}
.r42882w:hover{border-color:rgba(232,53,15,0.3);transform:translateY(-2px)}
.r42882w h4{font-size:15px;margin-bottom:6px}
.r42882w p{font-size:13px;color:var(--text-sub)}
.g9ew9{display:flex;gap:16px;margin-top:10px;font-size:12px;color:var(--text-muted)}

/* ---- 统计数据条 ---- */
.jbgnzks{background:linear-gradient(135deg,var(--red),var(--red-dark));padding:32px 0}
.a57sxb{display:flex;justify-content:space-around;flex-wrap:wrap;gap:20px}
.afwr5i2{text-align:center}
.afwr5i2 .num{font-size:36px;font-weight:800;color:#fff}
.afwr5i2 .label{font-size:14px;color:rgba(255,255,255,0.7)}

/* ---- AI赋能模块 ---- */
.bddpxk3t{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.zovf7yol{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:32px;display:flex;gap:20px;align-items:flex-start;transition:all var(--transition)}
.zovf7yol:hover{border-color:rgba(232,53,15,0.3);transform:translateY(-2px)}
.llhcz{width:52px;height:52px;background:linear-gradient(135deg,var(--orange),var(--red));border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:24px;flex-shrink:0}
.zovf7yol h3{font-size:17px;margin-bottom:6px}
.zovf7yol p{font-size:14px;color:var(--text-sub);line-height:1.7}

/* ---- 响应式 ---- */
@media(max-width:1024px){
    .video-grid{grid-template-columns:repeat(2,1fr)}
    .wt5g1kqn{grid-template-columns:repeat(2,1fr)}
    .kzjd9{grid-template-columns:repeat(2,1fr)}
    .hoyq7bk{grid-template-columns:repeat(3,1fr)}
    .ymhgen9i{grid-template-columns:repeat(2,1fr)}
    .qjqt8ei{grid-template-columns:repeat(2,1fr)}
    .bddpxk3t{grid-template-columns:1fr}
    .fwk43b{grid-template-columns:1fr}
}
@media(max-width:768px){
    .nav-menu{display:none;position:absolute;top:64px;left:0;right:0;background:var(--bg-deep);flex-direction:column;padding:16px;border-bottom:1px solid var(--border-color)}
    .nav-menu.open{display:flex}
    .nav-toggle{display:block}
    .hero h1{font-size:28px}
    .hero-stats{gap:20px}
    .hero-stat .num{font-size:22px}
    .video-grid{grid-template-columns:1fr}
    .wt5g1kqn{grid-template-columns:1fr}
    .kzjd9{grid-template-columns:1fr}
    .hoyq7bk{grid-template-columns:repeat(2,1fr)}
    .rkmuu0nd{grid-template-columns:1fr}
    .ymhgen9i{grid-template-columns:1fr}
    .qjqt8ei{grid-template-columns:1fr}
    .bjj2ljwf h2{font-size:24px}
    .a57sxb{gap:12px}
    .afwr5i2 .num{font-size:24px}
    .zjshyk{grid-template-columns:1fr}
    .hero{min-height:400px}
    .section{padding:40px 0}
}
@media(max-width:480px){
    .hero-btns{flex-direction:column}
    .btn-red,.btn-outline{width:100%;justify-content:center}
    .search-box{flex-direction:column}
    .search-box button{width:100%}
}

/* ---- 懒加载占位 ---- */
img[loading="lazy"]{opacity:0;transition:opacity .5s ease}
img[loading="lazy"].loaded,img[loading="lazy"][src]{opacity:1}

/* ---- 动画 ---- */
.fade-up{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}