/* ===== 91修车改装传媒 - 原创样式表 ===== */
/* 色彩体系: 深炭灰#1A1A2E 赛车红#E63946 金属银#C0C0C0 亮橙#FF6B35 */

*,*::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:#0D1117;color:#D0D7DE;line-height:1.75;overflow-x:hidden}
a{color:#E63946;text-decoration:none;transition:color .3s}
a:hover{color:#FF6B35}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}
h1,h2,h3,h4,h5,h6{color:#F0F6FC;font-weight:700;line-height:1.35}
h1{font-size:2.4rem}
h2{font-size:1.9rem}
h3{font-size:1.35rem}
h4{font-size:1.1rem}
.container{max-width:1240px;margin:0 auto;padding:0 20px}

/* ===== 头部导航 ===== */
.main-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(13,17,23,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(230,57,70,.25);transition:all .3s}
.main-header.scrolled{background:rgba(13,17,23,.98);box-shadow:0 2px 20px rgba(0,0,0,.5)}
.header-inner{max-width:1240px;margin:0 auto;padding:0 20px;display:flex;align-items:center;height:68px;gap:24px}
.logo-link{flex-shrink:0}
.logo-img{height:42px;width:auto}
.main-nav{flex:1}
.nav-list{display:flex;gap:6px}
.nav-list a{display:block;padding:8px 16px;color:#D0D7DE;font-size:.95rem;font-weight:500;border-radius:6px;transition:all .3s}
.nav-list a:hover,.nav-list a.nav-active{color:#fff;background:rgba(230,57,70,.15)}
.nav-list a.nav-active{color:#E63946;font-weight:600}
.header-search{flex-shrink:0}
.search-form{display:flex;align-items:center;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);border-radius:8px;overflow:hidden;transition:border-color .3s}
.search-form:focus-within{border-color:rgba(230,57,70,.5)}
.search-input{background:transparent;border:none;color:#F0F6FC;padding:8px 14px;font-size:.9rem;width:200px;outline:none}
.search-input::placeholder{color:#6E7681}
.search-btn{background:transparent;border:none;color:#D0D7DE;padding:8px 12px;cursor:pointer;transition:color .3s}
.search-btn:hover{color:#E63946}
.mobile-toggle{display:none;background:none;border:none;cursor:pointer;padding:6px;flex-direction:column;gap:5px}
.mobile-toggle span{display:block;width:24px;height:2px;background:#F0F6FC;border-radius:2px;transition:all .3s}

/* ===== Banner ===== */
.hero-banner{position:relative;min-height:92vh;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:68px}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;background-repeat:no-repeat}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,17,23,.88) 0%,rgba(26,26,46,.75) 50%,rgba(13,17,23,.85) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;max-width:900px;padding:40px 20px}
.hero-title{font-size:3.2rem;font-weight:800;margin-bottom:16px;background:linear-gradient(135deg,#E63946,#FF6B35);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-subtitle{font-size:1.3rem;color:#C0C0C0;margin-bottom:20px;font-weight:500}
.hero-desc{font-size:1rem;color:#8B949E;line-height:1.9;margin-bottom:32px;max-width:760px;margin-left:auto;margin-right:auto}
.hero-btns{display:flex;gap:16px;justify-content:center;margin-bottom:40px;flex-wrap:wrap}
.btn-primary{display:inline-block;padding:14px 36px;background:linear-gradient(135deg,#E63946,#FF6B35);color:#fff;font-weight:600;font-size:1rem;border-radius:8px;transition:all .3s;box-shadow:0 4px 20px rgba(230,57,70,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 28px rgba(230,57,70,.5);color:#fff}
.btn-outline{display:inline-block;padding:14px 36px;border:2px solid rgba(230,57,70,.5);color:#E63946;font-weight:600;font-size:1rem;border-radius:8px;transition:all .3s}
.btn-outline:hover{background:rgba(230,57,70,.1);border-color:#E63946;color:#fff}
.hero-stats{display:flex;gap:48px;justify-content:center;flex-wrap:wrap}
.stat-item{text-align:center}
.stat-num{display:block;font-size:2rem;font-weight:800;color:#E63946}
.stat-label{font-size:.85rem;color:#8B949E;margin-top:4px}

/* ===== 通用区块 ===== */
.section-block{padding:80px 0}
.section-dark{background:#161B22}
.section-header{text-align:center;margin-bottom:48px}
.section-title{margin-bottom:14px;position:relative;display:inline-block}
.section-title::after{content:'';display:block;width:60px;height:3px;background:linear-gradient(90deg,#E63946,#FF6B35);margin:12px auto 0;border-radius:2px}
.section-desc{color:#8B949E;font-size:1rem;max-width:680px;margin:0 auto}

/* ===== 视频卡片 ===== */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.video-card{background:#161B22;border-radius:12px;overflow:hidden;border:1px solid rgba(255,255,255,.06);transition:all .35s}
.video-card:hover{transform:translateY(-6px);border-color:rgba(230,57,70,.3);box-shadow:0 12px 40px rgba(0,0,0,.4)}
.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(1.06)}
.play-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.3);opacity:0;transition:opacity .35s}
.video-card:hover .play-overlay,.short-card:hover .play-overlay{opacity:1}
.play-btn{width:56px;height:56px;background:rgba(230,57,70,.9);border-radius:50%;position:relative;transition:transform .3s}
.play-btn::after{content:'';position:absolute;left:22px;top:16px;border-style:solid;border-width:12px 0 12px 20px;border-color:transparent transparent transparent #fff}
.video-card:hover .play-btn{transform:scale(1.1)}
.video-duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,.8);color:#fff;padding:3px 8px;border-radius:4px;font-size:.8rem;font-weight:600}
.video-tag{position:absolute;top:10px;left:10px;background:rgba(230,57,70,.85);color:#fff;padding:4px 10px;border-radius:4px;font-size:.75rem;font-weight:600}
.video-info{padding:16px 18px}
.video-title{font-size:1.05rem;margin-bottom:10px;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:14px;font-size:.82rem;color:#6E7681;flex-wrap:wrap}

/* ===== 短视频卡片 ===== */
.shorts-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.short-card{border-radius:12px;overflow:hidden;cursor:pointer;transition:transform .35s}
.short-card:hover{transform:translateY(-4px)}
.short-thumb{position:relative;aspect-ratio:3/4;overflow:hidden}
.short-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.short-card:hover .short-thumb img{transform:scale(1.06)}
.short-info{position:absolute;bottom:0;left:0;right:0;padding:20px 14px 14px;background:linear-gradient(transparent,rgba(0,0,0,.85))}
.short-info h4{color:#fff;font-size:.95rem;margin-bottom:4px}
.short-info p{color:#8B949E;font-size:.8rem}

/* ===== AI卡片 ===== */
.ai-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.ai-card{background:#161B22;border:1px solid rgba(255,255,255,.06);border-radius:12px;padding:32px 24px;text-align:center;transition:all .35s}
.ai-card:hover{border-color:rgba(230,57,70,.3);transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.3)}
.ai-icon{margin-bottom:20px;color:#E63946}
.ai-icon svg{margin:0 auto}
.ai-card h3{margin-bottom:12px;font-size:1.1rem}
.ai-card p{color:#8B949E;font-size:.9rem;line-height:1.7}

/* ===== 社区卡片 ===== */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.community-card{background:#0D1117;border-radius:12px;overflow:hidden;border:1px solid rgba(255,255,255,.06);transition:all .35s}
.community-card:hover{border-color:rgba(230,57,70,.3);transform:translateY(-4px)}
.community-card img{width:100%;aspect-ratio:16/9;object-fit:cover}
.community-info{padding:20px}
.community-info h3{margin-bottom:10px;font-size:1.15rem}
.community-info p{color:#8B949E;font-size:.9rem;margin-bottom:12px;line-height:1.7}
.community-stat{display:inline-block;background:rgba(230,57,70,.12);color:#E63946;padding:4px 12px;border-radius:20px;font-size:.82rem;font-weight:500}

/* ===== 专家卡片 ===== */
.experts-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:#161B22;border-radius:12px;overflow:hidden;border:1px solid rgba(255,255,255,.06);text-align:center;transition:all .35s}
.expert-card:hover{border-color:rgba(230,57,70,.3);transform:translateY(-4px)}
.expert-card>img{width:100%;aspect-ratio:1;object-fit:cover}
.expert-info{padding:20px}
.expert-info h3{margin-bottom:4px}
.expert-role{color:#E63946;font-size:.9rem;font-weight:500;margin-bottom:10px}
.expert-bio{color:#8B949E;font-size:.88rem;line-height:1.7;margin-bottom:14px}
.expert-tags{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin-bottom:14px}
.expert-tags span{background:rgba(230,57,70,.1);color:#E63946;padding:3px 10px;border-radius:12px;font-size:.78rem}
.expert-actions{display:flex;gap:8px;justify-content:center}
.btn-sm{display:inline-block;padding:7px 18px;background:linear-gradient(135deg,#E63946,#FF6B35);color:#fff;font-size:.82rem;font-weight:600;border-radius:6px;transition:all .3s}
.btn-sm:hover{transform:translateY(-1px);color:#fff}
.btn-sm-outline{display:inline-block;padding:7px 18px;border:1px solid rgba(230,57,70,.5);color:#E63946;font-size:.82rem;font-weight:500;border-radius:6px;transition:all .3s}
.btn-sm-outline:hover{background:rgba(230,57,70,.1);color:#fff}

/* ===== 合作品牌 ===== */
.partner-wall{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;margin-bottom:48px}
.partner-item{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:10px;padding:18px 36px;transition:all .3s}
.partner-item:hover{border-color:rgba(230,57,70,.4);background:rgba(230,57,70,.06)}
.partner-item span{color:#C0C0C0;font-size:1.1rem;font-weight:700;letter-spacing:1px}

/* ===== How-To ===== */
.howto-section{background:#0D1117;border-radius:16px;padding:40px;border:1px solid rgba(255,255,255,.06)}
.howto-title{text-align:center;margin-bottom:32px;font-size:1.5rem}
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.howto-step{text-align:center;padding:20px}
.step-num{font-size:2.4rem;font-weight:800;color:#E63946;opacity:.6;margin-bottom:12px}
.howto-step h4{margin-bottom:10px;font-size:1.05rem}
.howto-step p{color:#8B949E;font-size:.9rem;line-height:1.7}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid rgba(255,255,255,.08);border-radius:10px;margin-bottom:12px;overflow:hidden;transition:border-color .3s}
.faq-item:hover{border-color:rgba(230,57,70,.25)}
.faq-question{width:100%;display:flex;justify-content:space-between;align-items:center;padding:18px 22px;background:transparent;border:none;color:#F0F6FC;font-size:1rem;font-weight:600;cursor:pointer;text-align:left;gap:12px}
.faq-question svg{flex-shrink:0;color:#E63946;transition:transform .3s}
.faq-item.active .faq-question svg{transform:rotate(180deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease}
.faq-item.active .faq-answer{max-height:300px}
.faq-answer p{padding:0 22px 18px;color:#8B949E;font-size:.95rem;line-height:1.8}

/* ===== 评论 ===== */
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:#0D1117;border:1px solid rgba(255,255,255,.06);border-radius:12px;padding:28px;transition:all .35s}
.review-card:hover{border-color:rgba(230,57,70,.25);transform:translateY(-3px)}
.review-stars{color:#FF6B35;font-size:1.1rem;margin-bottom:14px;letter-spacing:2px}
.review-text{color:#D0D7DE;font-size:.92rem;line-height:1.8;margin-bottom:16px;font-style:italic}
.review-author strong{color:#F0F6FC;display:block;margin-bottom:2px}
.review-author span{color:#6E7681;font-size:.82rem}

/* ===== 联系 ===== */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
.contact-card{background:#161B22;border:1px solid rgba(255,255,255,.06);border-radius:12px;padding:32px}
.contact-card h3{margin-bottom:18px;font-size:1.2rem}
.contact-list{margin-bottom:20px}
.contact-list li{padding:8px 0;color:#8B949E;font-size:.95rem;border-bottom:1px solid rgba(255,255,255,.04)}
.contact-list li strong{color:#D0D7DE}
.qrcode-wrap{display:flex;gap:24px;margin-top:16px}
.qrcode-item{text-align:center}
.qrcode-item img{width:120px;height:120px;border-radius:8px;margin-bottom:8px;border:2px solid rgba(255,255,255,.08)}
.qrcode-item span{font-size:.82rem;color:#8B949E}

/* ===== 分享 ===== */
.share-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.share-btn{display:flex;align-items:center;gap:8px;padding:12px 28px;border-radius:8px;color:#fff;font-weight:500;font-size:.95rem;transition:all .3s}
.share-btn:hover{transform:translateY(-2px);color:#fff}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823;border:1px solid rgba(255,255,255,.15)}
.share-bilibili{background:#00A1D6}
.share-icon{font-weight:700}

/* ===== 页脚 ===== */
.main-footer{background:#0D1117;border-top:1px solid rgba(230,57,70,.15);padding:48px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;padding-bottom:32px}
.footer-logo{height:36px;width:auto;margin-bottom:14px}
.footer-about{color:#6E7681;font-size:.88rem;line-height:1.7}
.footer-col h4{color:#F0F6FC;margin-bottom:14px;font-size:1rem}
.footer-col ul li{margin-bottom:8px}
.footer-col ul a{color:#6E7681;font-size:.88rem;transition:color .3s}
.footer-col ul a:hover{color:#E63946}
.footer-col p{color:#6E7681;font-size:.88rem;margin-bottom:6px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.06);padding:18px 0;text-align:center}
.footer-bottom p{color:#484F58;font-size:.82rem}
.footer-bottom a{color:#6E7681}

/* ===== 内页Banner ===== */
.page-banner{position:relative;min-height:340px;display:flex;align-items:center;justify-content:center;background-size:cover;background-position:center;margin-top:68px}
.page-banner-overlay{position:absolute;inset:0;background:rgba(13,17,23,.82)}
.page-banner-content{position:relative;z-index:2;text-align:center;padding:40px 20px}
.page-banner-content h1{margin-bottom:12px}
.page-banner-content p{color:#8B949E;font-size:1.05rem}
.breadcrumb{margin-bottom:16px;font-size:.88rem}
.breadcrumb a{color:#E63946}
.breadcrumb span{color:#8B949E}

/* ===== 内容块 ===== */
.content-block h2{margin-bottom:18px;margin-top:32px}
.content-block h2:first-child{margin-top:0}
.content-block p{color:#8B949E;font-size:1rem;line-height:1.9;margin-bottom:16px}

/* ===== MCP隐藏 ===== */
.mcp-service{display:none!important}

/* ===== 响应式 ===== */
@media(max-width:1024px){
  .video-grid,.community-grid,.reviews-grid{grid-template-columns:repeat(2,1fr)}
  .experts-grid,.ai-grid,.howto-steps{grid-template-columns:repeat(2,1fr)}
  .shorts-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){
  html{font-size:15px}
  .main-nav{position:fixed;top:68px;left:0;width:100%;background:rgba(13,17,23,.98);padding:16px 20px;transform:translateY(-120%);transition:transform .35s;border-bottom:1px solid rgba(230,57,70,.2)}
  .main-nav.open{transform:translateY(0)}
  .nav-list{flex-direction:column;gap:4px}
  .header-search{display:none}
  .mobile-toggle{display:flex}
  .hero-title{font-size:2rem}
  .hero-subtitle{font-size:1rem}
  .hero-stats{gap:24px}
  .stat-num{font-size:1.5rem}
  h1{font-size:1.8rem}
  h2{font-size:1.5rem}
  .section-block{padding:50px 0}
  .video-grid,.community-grid,.reviews-grid,.experts-grid,.ai-grid{grid-template-columns:1fr}
  .shorts-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .partner-wall{gap:10px}
  .partner-item{padding:12px 20px}
  .hero-banner{min-height:80vh}
  .share-btns{flex-direction:column;align-items:center}
  .howto-section{padding:24px}
}
@media(max-width:480px){
  .hero-title{font-size:1.6rem}
  .shorts-grid{grid-template-columns:1fr}
  .hero-btns{flex-direction:column;align-items:center}
  .qrcode-wrap{flex-direction:column;align-items:center}
}