/* 91 品牌官网 - 原创样式表 */
/* 颜色方案：赛车红 #E8350F | 深夜蓝黑 #1A1A2E | 改装金 #F5A623 | 极深蓝黑 #0D0D1A */

/* ===== 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:#0D0D1A;color:#F0F0F0;line-height:1.7;overflow-x:hidden}
a{color:#F5A623;text-decoration:none;transition:color .3s}
a:hover{color:#E8350F}
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 ===== */
.container{max-width:1280px;margin:0 auto;padding:0 20px}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;color:#F0F0F0;position:relative;display:inline-block;padding-bottom:12px}
.section-title h2::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,#E8350F,#F5A623)}
.section-title p{color:#999;margin-top:10px;font-size:.95rem}

/* ===== 头部导航 ===== */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(13,13,26,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(232,53,15,.2);transition:all .3s}
.site-header .header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;max-width:1400px;margin:0 auto}
.site-logo{display:flex;align-items:center;gap:10px}
.site-logo img{height:42px;width:auto}
.site-logo span{font-size:1.5rem;font-weight:800;color:#E8350F;letter-spacing:2px}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{padding:10px 16px;font-size:.9rem;color:#ccc;transition:all .3s;position:relative}
.main-nav a:hover,.main-nav a.active{color:#E8350F}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:2px;background:#E8350F;transition:all .3s;transform:translateX(-50%)}
.main-nav a:hover::after,.main-nav a.active::after{width:60%}
.mobile-menu-btn{display:none;background:none;border:none;color:#F0F0F0;font-size:1.5rem;cursor:pointer}

/* ===== 搜索框 ===== */
.search-bar{background:rgba(22,22,42,.8);padding:14px 0;border-bottom:1px solid rgba(245,166,35,.1)}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;max-width:600px;width:100%}
.search-box input{flex:1;padding:10px 18px;background:rgba(255,255,255,.08);border:1px solid rgba(232,53,15,.3);border-right:none;border-radius:25px 0 0 25px;color:#F0F0F0;font-size:.9rem;outline:none;transition:border-color .3s}
.search-box input:focus{border-color:#E8350F}
.search-box input::placeholder{color:#666}
.search-box button{padding:10px 24px;background:linear-gradient(135deg,#E8350F,#c42a0a);border:none;border-radius:0 25px 25px 0;color:#fff;font-size:.9rem;cursor:pointer;transition:opacity .3s}
.search-box button:hover{opacity:.85}

/* ===== Banner ===== */
.hero-banner{position:relative;height:75vh;min-height:500px;overflow:hidden;margin-top:62px}
.hero-banner .banner-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.55)}
.hero-banner .banner-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,13,26,.3) 0%,rgba(13,13,26,.85) 100%)}
.hero-banner .banner-content{position:relative;z-index:2;height:100%;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:0 20px}
.hero-banner h1{font-size:3rem;margin-bottom:16px;background:linear-gradient(135deg,#E8350F,#F5A623);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-banner .hero-desc{font-size:1.15rem;color:#ccc;max-width:700px;margin-bottom:28px;line-height:1.8}
.hero-banner .hero-tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.hero-banner .hero-tags span{padding:6px 16px;background:rgba(232,53,15,.15);border:1px solid rgba(232,53,15,.3);border-radius:20px;font-size:.82rem;color:#F5A623}
.hero-cta{display:inline-flex;align-items:center;gap:8px;padding:12px 32px;background:linear-gradient(135deg,#E8350F,#c42a0a);color:#fff;border-radius:30px;font-size:1rem;font-weight:600;margin-top:20px;transition:transform .3s,box-shadow .3s}
.hero-cta:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(232,53,15,.4);color:#fff}

/* ===== 通用板块 ===== */
.section{padding:70px 0}
.section-alt{background:rgba(22,22,42,.5)}

/* ===== 视频卡片网格 ===== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.video-card{background:#16162A;border-radius:12px;overflow:hidden;transition:transform .3s,box-shadow .3s;cursor:pointer;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(232,53,15,.2)}
.video-card .thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .thumb img{transform:scale(1.05)}
.video-card .play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;background:rgba(232,53,15,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s}
.video-card:hover .play-btn{opacity:1}
.play-btn::after{content:'';display:block;width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-card .card-info{padding:16px}
.video-card .card-info h3{font-size:1rem;margin-bottom:8px;color:#F0F0F0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-meta{display:flex;justify-content:space-between;align-items:center;font-size:.8rem;color:#888}
.video-card .card-meta .views{color:#F5A623}
.video-card .card-tags{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
.video-card .card-tags span{padding:3px 10px;background:rgba(232,53,15,.1);border-radius:12px;font-size:.72rem;color:#E8350F}
.video-card .duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);padding:2px 8px;border-radius:4px;font-size:.75rem;color:#fff}
.video-card .card-stats{display:flex;gap:14px;margin-top:10px;font-size:.78rem;color:#888}
.video-card .card-stats span{display:flex;align-items:center;gap:4px}

/* ===== 模块卡片 ===== */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.feature-card{background:linear-gradient(145deg,#16162A,#1a1a35);border:1px solid rgba(232,53,15,.1);border-radius:12px;padding:30px 24px;text-align:center;transition:all .3s}
.feature-card:hover{border-color:rgba(232,53,15,.4);transform:translateY(-4px);box-shadow:0 8px 25px rgba(232,53,15,.15)}
.feature-card .icon{width:60px;height:60px;margin:0 auto 16px;background:linear-gradient(135deg,rgba(232,53,15,.2),rgba(245,166,35,.2));border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.6rem}
.feature-card h3{font-size:1.1rem;margin-bottom:10px;color:#F5A623}
.feature-card p{font-size:.88rem;color:#999;line-height:1.6}

/* ===== 专家展示 ===== */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:28px}
.expert-card{background:#16162A;border-radius:14px;overflow:hidden;text-align:center;transition:all .3s;border:1px solid rgba(245,166,35,.08)}
.expert-card:hover{border-color:rgba(245,166,35,.3);transform:translateY(-4px)}
.expert-card .expert-photo{width:100%;aspect-ratio:3/4;object-fit:cover}
.expert-card .expert-info{padding:20px}
.expert-card h3{font-size:1.1rem;color:#F5A623;margin-bottom:4px}
.expert-card .role{font-size:.82rem;color:#E8350F;margin-bottom:10px}
.expert-card p{font-size:.85rem;color:#999;line-height:1.5;margin-bottom:14px}
.expert-card .expert-btns{display:flex;gap:10px;justify-content:center}
.expert-card .btn-sm{padding:6px 16px;border-radius:20px;font-size:.8rem;border:1px solid;transition:all .3s}
.btn-primary-sm{background:rgba(232,53,15,.15);border-color:#E8350F !important;color:#E8350F}
.btn-primary-sm:hover{background:#E8350F;color:#fff}
.btn-gold-sm{background:rgba(245,166,35,.1);border-color:#F5A623 !important;color:#F5A623}
.btn-gold-sm:hover{background:#F5A623;color:#0D0D1A}

/* ===== 合作品牌墙 ===== */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.brand-wall .brand-item{width:120px;height:60px;background:rgba(255,255,255,.05);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:.9rem;color:#888;font-weight:600;border:1px solid rgba(255,255,255,.08);transition:all .3s}
.brand-wall .brand-item:hover{border-color:#F5A623;color:#F5A623}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#16162A;border-radius:10px;margin-bottom:12px;overflow:hidden;border:1px solid rgba(232,53,15,.08)}
.faq-item .faq-q{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#F0F0F0;transition:background .3s}
.faq-item .faq-q:hover{background:rgba(232,53,15,.05)}
.faq-item .faq-q .arrow{transition:transform .3s;color:#E8350F;font-size:1.2rem}
.faq-item.active .faq-q .arrow{transform:rotate(180deg)}
.faq-item .faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s ease;color:#999;font-size:.9rem;line-height:1.7}
.faq-item.active .faq-a{padding:0 24px 18px;max-height:500px}

/* ===== 用户评论 ===== */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:#16162A;border-radius:12px;padding:24px;border:1px solid rgba(245,166,35,.08);transition:all .3s}
.review-card:hover{border-color:rgba(245,166,35,.25)}
.review-card .stars{color:#F5A623;font-size:.9rem;margin-bottom:10px;letter-spacing:2px}
.review-card .review-text{font-size:.9rem;color:#ccc;line-height:1.6;margin-bottom:14px;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:linear-gradient(135deg,#E8350F,#F5A623);display:flex;align-items:center;justify-content:center;color:#fff;font-size:.85rem;font-weight:700}
.review-card .reviewer .name{font-size:.85rem;color:#F0F0F0}
.review-card .reviewer .date{font-size:.75rem;color:#666}

/* ===== How-To 指南 ===== */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px;margin-top:30px}
.howto-step{text-align:center;padding:24px;background:#16162A;border-radius:12px;border:1px solid rgba(232,53,15,.08)}
.howto-step .step-num{width:48px;height:48px;margin:0 auto 14px;background:linear-gradient(135deg,#E8350F,#F5A623);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:800;color:#fff}
.howto-step h4{color:#F5A623;margin-bottom:8px}
.howto-step p{font-size:.85rem;color:#999}

/* ===== 联系我们 ===== */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:30px}
.contact-card{background:#16162A;border-radius:12px;padding:28px;border:1px solid rgba(232,53,15,.1)}
.contact-card h3{color:#F5A623;margin-bottom:14px;font-size:1.1rem}
.contact-card p{font-size:.88rem;color:#999;margin-bottom:8px;line-height:1.6}
.contact-card .highlight{color:#E8350F;font-weight:600}

/* ===== 社交分享 ===== */
.share-bar{display:flex;justify-content:center;gap:16px;padding:20px 0}
.share-btn{padding:8px 20px;border-radius:20px;font-size:.85rem;border:1px solid rgba(255,255,255,.15);color:#ccc;transition:all .3s;cursor:pointer;background:transparent}
.share-btn:hover{border-color:#E8350F;color:#E8350F;background:rgba(232,53,15,.08)}

/* ===== 页脚 ===== */
.site-footer{background:#0a0a18;border-top:1px solid rgba(232,53,15,.15);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:40px}
.footer-col h4{color:#F5A623;margin-bottom:16px;font-size:1rem}
.footer-col p,.footer-col a{font-size:.85rem;color:#888;display:block;margin-bottom:8px;line-height:1.5}
.footer-col a:hover{color:#E8350F}
.footer-qr{display:flex;gap:20px;margin-top:12px}
.footer-qr img{width:100px;height:100px;border-radius:8px;border:1px solid rgba(245,166,35,.15)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.06);padding:20px 0;text-align:center;font-size:.82rem;color:#555}
.footer-bottom .update-time{color:#888;margin-top:6px}

/* ===== 面包屑 ===== */
.breadcrumb{padding:16px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#F5A623}
.breadcrumb span{margin:0 8px;color:#555}

/* ===== 内页通用 ===== */
.page-hero{padding:120px 0 50px;text-align:center;background:linear-gradient(180deg,rgba(232,53,15,.08),transparent)}
.page-hero h1{font-size:2.2rem;color:#F0F0F0;margin-bottom:12px}
.page-hero p{color:#999;font-size:1rem}

/* ===== MCP前端占位 ===== */
.mcp-widget{background:rgba(22,22,42,.6);border:1px dashed rgba(245,166,35,.2);border-radius:12px;padding:30px;text-align:center;margin:20px 0}
.mcp-widget p{color:#666;font-size:.85rem}

/* ===== 响应式 ===== */
@media(max-width:992px){
  .main-nav{display:none;position:absolute;top:100%;left:0;width:100%;background:rgba(13,13,26,.98);flex-direction:column;padding:20px 0;border-top:1px solid rgba(232,53,15,.2)}
  .main-nav.show{display:flex}
  .main-nav a{padding:12px 24px;width:100%;text-align:left}
  .mobile-menu-btn{display:block}
  .hero-banner h1{font-size:2rem}
  .hero-banner{height:60vh;min-height:400px}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
}
@media(max-width:640px){
  .hero-banner h1{font-size:1.6rem}
  .hero-banner .hero-desc{font-size:.95rem}
  .section{padding:50px 0}
  .section-title h2{font-size:1.5rem}
  .video-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
}

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

/* ===== 滚动动画 ===== */
.fade-in{opacity:0;transform:translateY(30px);transition:all .6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}


/* ===== 面包屑导航条 ===== */
.breadcrumb-bar{background:rgba(22,22,42,.6);border-bottom:1px solid rgba(245,166,35,.06)}
.breadcrumb-bar .breadcrumb{padding:12px 0}

/* ===== 屏幕阅读器辅助 ===== */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ===== 法律页面 ===== */
.legal-content h2{color:#F5A623;font-size:1.3rem;margin:30px 0 14px;padding-bottom:8px;border-bottom:1px solid rgba(245,166,35,.15)}
.legal-content p{margin-bottom:10px}

/* ===== Banner无margin-top修正 ===== */
.hero-banner{margin-top:0}

/* ===== 视频卡片Microdata隐藏 ===== */
.video-card meta{display:none}