/* ============================================
   四虎视频 修车改装视频社区 - 全站样式表
   品牌：四虎视频 | 域名：atx1jd.cn
   配色：赛车红 #E63946 / 深海蓝 #1D3557 / 琥珀橙 #F4A261
   EEAT优化版 v2.0
   ============================================ */

/* === Reset & Base === */
*,*::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;color:#2B2D42;background:#F1FAEE;line-height:1.7;overflow-x:hidden}
a{color:#E63946;text-decoration:none;transition:color .3s}
a:hover{color:#F4A261}
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:#1D3557}

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

/* === Header === */
.site-header{background:#0D1B2A;position:sticky;top:0;z-index:1000;box-shadow:0 2px 20px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;max-width:1200px;margin:0 auto}
.c081d{display:flex;align-items:center;gap:10px}
.c081d img{height:50px;width:auto}
.d7yew1t{color:#fff;font-size:1.5rem;font-weight:800;letter-spacing:2px}
.d7yew1t span{color:#E63946}

/* === Navigation === */
.main-nav ul{display:flex;gap:5px}
.main-nav a{color:#F1FAEE;padding:8px 14px;border-radius:6px;font-size:.9rem;font-weight:500;transition:all .3s;white-space:nowrap}
.main-nav a:hover,.main-nav a.active{background:#E63946;color:#fff}
.ildmnuu{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer;padding:5px}

/* === Breadcrumb Bar === */
.breadcrumb-bar{background:#162a45;padding:0}
.breadcrumb{padding:10px 0;font-size:.85rem;color:#8D99AE}
.breadcrumb a{color:#E63946;font-weight:500}
.breadcrumb a:hover{color:#F4A261}
.breadcrumb span{margin:0 5px;color:#8D99AE}

/* === Search Bar === */
.search-bar{background:#1D3557;padding:12px 0}
.search-bar .container{display:flex;justify-content:center}
.search-form{display:flex;max-width:600px;width:100%;position:relative}
.search-form input{flex:1;padding:10px 20px;border:2px solid #E63946;border-radius:25px 0 0 25px;font-size:.95rem;outline:none;background:#0D1B2A;color:#F1FAEE}
.search-form input::placeholder{color:#8D99AE}
.search-form button{padding:10px 25px;background:#E63946;color:#fff;border:2px solid #E63946;border-radius:0 25px 25px 0;cursor:pointer;font-size:.95rem;font-weight:600;transition:background .3s}
.search-form button:hover{background:#c62e3a}

/* === Banner / Hero === */
.hero-banner{position:relative;height:70vh;min-height:450px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.hero-banner .dxxkg0m{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:brightness(.55)}
.hero-content{position:relative;z-index:2;text-align:center;color:#fff;padding:20px;max-width:800px}
.hero-content h1{font-size:2.8rem;margin-bottom:15px;text-shadow:2px 2px 8px rgba(0,0,0,.6)}
.hero-content h1 span{color:#E63946}
.hero-content p{font-size:1.15rem;margin-bottom:25px;text-shadow:1px 1px 4px rgba(0,0,0,.5)}
.hero-content .41od6zfy{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:20px}
.hero-content .41od6zfy span{background:rgba(230,57,70,.85);padding:5px 15px;border-radius:20px;font-size:.85rem;font-weight:500}
.hero-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:15px}
.o16i6{font-size:.8rem;color:rgba(255,255,255,.7);margin-top:10px}
.btn-primary{display:inline-block;background:#E63946;color:#fff;padding:12px 30px;border-radius:30px;font-weight:600;font-size:1rem;transition:all .3s;border:2px solid #E63946}
.btn-primary:hover{background:transparent;color:#E63946}
.btn-secondary{display:inline-block;background:transparent;color:#fff;padding:12px 30px;border-radius:30px;font-weight:600;font-size:1rem;transition:all .3s;border:2px solid #F4A261}
.btn-secondary:hover{background:#F4A261;color:#0D1B2A}

/* === Section Titles === */
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;color:#1D3557;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:4px;background:#E63946;margin:10px auto 0;border-radius:2px}
.section-title p{color:#8D99AE;font-size:1rem;max-width:700px;margin:0 auto}

/* === Video Card Grid === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:25px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,.08);transition:transform .3s,box-shadow .3s;position:relative}
.video-card:hover{transform:translateY(-5px);box-shadow:0 8px 30px rgba(0,0,0,.15)}
.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(1.05)}
.rnuqx{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.4);opacity:0;transition:opacity .3s}
.video-card:hover .rnuqx{opacity:1}
.41trx{width:60px;height:60px;background:rgba(230,57,70,.9);border-radius:50%;display:flex;align-items:center;justify-content:center}
.41trx::after{content:'';display:block;width:0;height:0;border-style:solid;border-width:12px 0 12px 22px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-info{padding:15px}
.video-info h3{font-size:1.05rem;margin-bottom:8px;color:#1D3557;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.fnwxl0{color:#8D99AE;font-size:.82rem;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.5}
.d80gekc{display:flex;gap:12px;color:#8D99AE;font-size:.78rem;flex-wrap:wrap;margin-bottom:8px}
.d80gekc span,.d80gekc time{display:flex;align-items:center;gap:4px}
.lqn6wtr5{display:inline-block;background:#E63946;color:#fff;padding:2px 10px;border-radius:10px;font-size:.75rem;position:absolute;top:10px;left:10px;z-index:3}
.b2sm88hd{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem;z-index:3}

/* === Expert Cards === */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:25px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,.08);text-align:center;transition:transform .3s}
.expert-card:hover{transform:translateY(-5px)}
.expert-card .expert-img{width:100%;height:280px;object-fit:cover}
.expert-card .expert-body{padding:20px}
.expert-card h4{font-size:1.1rem;color:#1D3557;margin-bottom:5px}
.expert-card .rgthbm{color:#E63946;font-size:.85rem;font-weight:600;margin-bottom:10px}
.expert-card p{color:#8D99AE;font-size:.85rem;margin-bottom:10px}
.ay08am{font-size:.78rem;color:#F4A261;margin-bottom:12px}
.expert-card .fb5dr{display:flex;gap:10px;justify-content:center}
.expert-card .fb5dr a{padding:6px 16px;border-radius:20px;font-size:.8rem;font-weight:500}

/* === FAQ Section === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;box-shadow:0 2px 10px rgba(0,0,0,.05);overflow:hidden}
.faq-question{padding:18px 25px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#1D3557;transition:background .3s}
.faq-question:hover{background:#f8f9fa}
.faq-question .arrow{transition:transform .3s;font-size:1.2rem;color:#E63946}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 25px;max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;color:#8D99AE;line-height:1.8}
.faq-item.active .faq-answer{max-height:300px;padding:0 25px 18px}

/* === Reviews === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:#fff;border-radius:12px;padding:25px;box-shadow:0 4px 15px rgba(0,0,0,.08);position:relative}
.review-card::before{content:'\201C';font-size:4rem;color:#E63946;opacity:.2;position:absolute;top:5px;left:15px;font-family:Georgia,serif}
.x1n12df{color:#F4A261;margin-bottom:10px;font-size:1.1rem}
.review-card p{color:#2B2D42;font-size:.9rem;margin-bottom:15px;font-style:italic;position:relative;z-index:1}
.review-author{display:flex;align-items:center;gap:10px}
.qdn5n18m{width:40px;height:40px;border-radius:50%;background:#E63946;color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem}
.p24sk .name{font-weight:600;color:#1D3557;font-size:.85rem}
.p24sk .date,.p24sk time{color:#8D99AE;font-size:.75rem;display:block}

/* === Community Section === */
.community-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}
.community-card{background:linear-gradient(135deg,#1D3557,#0D1B2A);color:#F1FAEE;border-radius:12px;padding:25px;text-align:center;transition:transform .3s}
.community-card:hover{transform:translateY(-5px)}
.community-card .icon{font-size:2.5rem;margin-bottom:15px;color:#E63946}
.community-card h4{margin-bottom:10px;font-size:1.05rem;color:#fff}
.community-card p{font-size:.85rem;color:#8D99AE}

/* === AI Section === */
.ai-section{background:linear-gradient(135deg,#0D1B2A 0%,#1D3557 100%);color:#F1FAEE}
.ai-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:25px}
.ai-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:25px;backdrop-filter:blur(10px);transition:transform .3s,border-color .3s}
.ai-card:hover{transform:translateY(-5px);border-color:#E63946}
.ai-card .kkfyr1{font-size:2rem;color:#F4A261;margin-bottom:15px}
.ai-card h4{color:#fff;margin-bottom:10px}
.ai-card p{color:#8D99AE;font-size:.9rem}

/* === How-To Guide === */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px;counter-reset:step}
.howto-step{background:#fff;border-radius:12px;padding:25px;text-align:center;box-shadow:0 4px 15px rgba(0,0,0,.08);position:relative;counter-increment:step}
.howto-step::before{content:counter(step);display:flex;align-items:center;justify-content:center;width:45px;height:45px;background:#E63946;color:#fff;border-radius:50%;font-weight:700;font-size:1.2rem;margin:0 auto 15px}
.howto-step h4{color:#1D3557;margin-bottom:10px}
.howto-step p{color:#8D99AE;font-size:.85rem}

/* === Stats Bar === */
.stats-bar{background:#1D3557;padding:30px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-item .mdk8sim{font-size:2.2rem;font-weight:800;color:#E63946}
.stat-item .t9jxm6j{color:#8D99AE;font-size:.85rem;margin-top:5px}

/* === Contact Section === */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.contact-info-card{background:#fff;border-radius:12px;padding:30px;box-shadow:0 4px 15px rgba(0,0,0,.08)}
.contact-info-card h3{color:#1D3557;margin-bottom:20px;font-size:1.3rem}
.contact-item{display:flex;align-items:flex-start;gap:12px;margin-bottom:15px}
.contact-icon{width:40px;height:40px;background:#E63946;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-weight:700}
.contact-text h5{color:#1D3557;font-size:.95rem;margin-bottom:3px}
.contact-text p{color:#8D99AE;font-size:.85rem}

/* === QR Code Section === */
.knqamia{display:flex;gap:30px;justify-content:center;flex-wrap:wrap}
.b386n29{text-align:center}
.b386n29 img{width:160px;height:160px;border-radius:10px;margin-bottom:10px;box-shadow:0 4px 15px rgba(0,0,0,.1)}
.b386n29 p{color:#8D99AE;font-size:.85rem;font-weight:500}

/* === Share Buttons === */
.s5fpp2b{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;padding:20px 0}
.94i9x{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:25px;color:#fff;font-size:.85rem;font-weight:500;transition:transform .2s,opacity .3s}
.94i9x:hover{transform:scale(1.05);color:#fff;opacity:.9}
.gtf4u3t{background:#07C160}
.d2qmutl{background:#E6162D}
.ls4gbalj{background:#161823}
.dl28ts5n{background:#FB7299}

/* === Inner Page Hero === */
.inner-hero{background:linear-gradient(135deg,#0D1B2A,#1D3557);padding:60px 0;text-align:center;color:#fff}
.inner-hero h1{font-size:2.2rem;margin-bottom:10px;color:#fff}
.inner-hero h1 span{color:#E63946}
.inner-hero p{color:#8D99AE;font-size:1rem}
.inner-hero .o16i6{font-size:.8rem;color:rgba(255,255,255,.5);margin-top:10px}

/* === Content Sections === */
.content-block{background:#fff;border-radius:12px;padding:30px;margin-bottom:25px;box-shadow:0 4px 15px rgba(0,0,0,.08)}
.content-block h3{color:#1D3557;margin-bottom:15px;font-size:1.3rem}
.content-block p{color:#2B2D42;margin-bottom:12px;line-height:1.8}

/* === Tags === */
.k8fje{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 0}
.ajlxz{background:#f0f0f0;color:#1D3557;padding:4px 14px;border-radius:15px;font-size:.8rem;transition:background .3s}
.ajlxz:hover{background:#E63946;color:#fff}

/* === Footer === */
.site-footer{background:#0D1B2A;color:#8D99AE;padding:40px 0 20px}
.1suk6wz8{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;margin-bottom:30px}
.q1vwi h4,.q1vwi h5{color:#fff;margin-bottom:15px;font-size:1rem}
.q1vwi a{display:block;color:#8D99AE;padding:3px 0;font-size:.85rem;transition:color .3s}
.q1vwi a:hover{color:#E63946}
.v5gmn{display:flex;align-items:center;gap:10px;margin-bottom:15px}
.v5gmn img{height:40px}
.v5gmn span{color:#fff;font-size:1.3rem;font-weight:800}
.4iqniy{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;text-align:center;font-size:.8rem}
.4iqniy a{color:#E63946}
.03bfk3e{margin-top:8px;font-size:.75rem;color:#8D99AE}
.xmrulsf9{color:#666;font-size:.7rem;margin-top:8px}

/* === MCP Frontend Placeholder === */
.c9v1e0{background:rgba(255,255,255,.05);border:1px dashed rgba(255,255,255,.2);border-radius:8px;padding:15px;text-align:center;margin-top:15px;font-size:.8rem;color:#8D99AE}

/* === Brand Wall === */
.brand-wall{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;align-items:center}
.brand-wall img{height:60px;opacity:.7;transition:opacity .3s;filter:grayscale(50%)}
.brand-wall img:hover{opacity:1;filter:grayscale(0)}

/* === Lazy Load === */
img[loading="lazy"]{opacity:0;transition:opacity .5s}
img.loaded,img[loading="lazy"]{opacity:1}

/* === Dark Section === */
.dark-section{background:#0D1B2A;color:#F1FAEE}
.dark-section .section-title h2{color:#fff}
.dark-section .section-title p{color:#8D99AE}

/* === Back to Top === */
.back-to-top{position:fixed;bottom:30px;right:30px;width:45px;height:45px;background:#E63946;color:#fff;border:none;border-radius:50%;font-size:1.2rem;cursor:pointer;display:none;align-items:center;justify-content:center;box-shadow:0 4px 15px rgba(230,57,70,.4);z-index:999;transition:opacity .3s,transform .3s}
.back-to-top:hover{transform:translateY(-3px)}
.back-to-top.visible{display:flex}

/* === 404 Page === */
.error-page{text-align:center;padding:100px 20px}
.error-page h1{font-size:6rem;color:#E63946;margin-bottom:10px}
.error-page h2{font-size:1.8rem;color:#1D3557;margin-bottom:20px}
.error-page p{color:#8D99AE;margin-bottom:30px}

/* === Responsive === */
@media(max-width:992px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;order:3}
  .main-nav.active{display:block}
  .main-nav ul{flex-direction:column;padding:10px 0}
  .main-nav a{display:block;padding:10px 15px}
  .ildmnuu{display:block}
  .hero-content h1{font-size:2rem}
  .contact-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .hero-banner{height:50vh;min-height:350px}
  .hero-content h1{font-size:1.6rem}
  .hero-content p{font-size:.95rem}
  .section-padding{padding:40px 0}
  .section-title h2{font-size:1.5rem}
  .video-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .1suk6wz8{grid-template-columns:repeat(2,1fr)}
  .community-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:480px){
  .expert-grid{grid-template-columns:1fr}
  .1suk6wz8{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:1fr}
  .hero-content h1{font-size:1.3rem}
  .community-grid{grid-template-columns:1fr}
}

/* === Print Styles === */
@media print{
  .site-header,.search-bar,.breadcrumb-bar,.s5fpp2b,.back-to-top,.c9v1e0,.rnuqx{display:none!important}
  body{background:#fff;color:#000}
  .dark-section{background:#fff;color:#000}
  .dark-section .section-title h2{color:#000}
}