/* ============================================
   麻豆视频 - 汽车改装视频社区 全站样式
   品牌色系：赛车红 #E8350F / 深夜蓝 #1A1A2E / 橙焰 #FF6B35
   ============================================ */

/* === 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:#2D2D3A;background:#F5F5F0;line-height:1.7;overflow-x:hidden}
a{color:#E8350F;text-decoration:none;transition:color .3s}
a:hover{color:#FF6B35}
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:#1A1A2E}

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

/* === Header === */
.site-header{background:#1A1A2E;position:sticky;top:0;z-index:1000;box-shadow:0 2px 12px 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}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:48px;width:auto}
.logo-wrap .brand-name{color:#fff;font-size:1.4rem;font-weight:800;letter-spacing:2px}
.logo-wrap .brand-name span{color:#E8350F}

/* Nav */
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{color:#ccc;padding:12px 16px;font-size:.95rem;transition:all .3s;position:relative}
.main-nav a:hover,.main-nav a.active{color:#fff;background:rgba(232,53,15,.15)}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:3px;background:#E8350F;transition:all .3s;transform:translateX(-50%)}
.main-nav a:hover::after,.main-nav a.active::after{width:70%}

/* Mobile Nav Toggle */
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

/* === Search Bar === */
.search-bar{background:linear-gradient(135deg,#1A1A2E 0%,#2a2a4e 100%);padding:12px 0;border-bottom:2px solid #E8350F}
.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;border:2px solid #3a3a5e;border-right:none;border-radius:25px 0 0 25px;background:#0d0d1a;color:#fff;font-size:.95rem;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,#FF6B35);color:#fff;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:.95rem;transition:opacity .3s}
.search-box button:hover{opacity:.85}

/* === Hero Banner === */
.hero-banner{position:relative;overflow:hidden;height:480px;background:#1A1A2E}
.hero-banner .slide{position:absolute;inset:0;opacity:0;transition:opacity 1s}
.hero-banner .slide.active{opacity:1}
.hero-banner img{width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(90deg,rgba(26,26,46,.85) 0%,rgba(26,26,46,.3) 60%,transparent 100%);display:flex;align-items:center;padding:0 60px}
.hero-text{max-width:550px}
.hero-text h1{font-size:2.6rem;color:#fff;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.5)}
.hero-text h1 span{color:#E8350F}
.hero-text p{color:#ccc;font-size:1.1rem;margin-bottom:24px;line-height:1.8}
.hero-text .btn-group{display:flex;gap:12px;flex-wrap:wrap}

/* === Buttons === */
.btn{display:inline-block;padding:12px 28px;border-radius:6px;font-size:.95rem;font-weight:600;transition:all .3s;cursor:pointer;border:none;text-align:center}
.btn-primary{background:linear-gradient(135deg,#E8350F,#FF6B35);color:#fff;box-shadow:0 4px 15px rgba(232,53,15,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(232,53,15,.4);color:#fff}
.btn-outline{background:transparent;color:#fff;border:2px solid #fff}
.btn-outline:hover{background:#fff;color:#1A1A2E}
.btn-sm{padding:8px 18px;font-size:.85rem}

/* === Section Common === */
.section{padding:60px 0}
.section-dark{background:#1A1A2E;color:#fff}
.section-dark h2,.section-dark h3,.section-dark h4{color:#fff}
.section-alt{background:#eae9e4}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:4px;background:linear-gradient(90deg,#E8350F,#FF6B35);margin:12px auto 0;border-radius:2px}
.section-title p{color:#666;font-size:1rem;max-width:600px;margin:0 auto}
.section-dark .section-title p{color:#aaa}

/* === Video Cards Grid === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.08);transition:all .3s;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 8px 30px rgba(0,0,0,.15)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#1A1A2E}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .video-thumb img{transform:scale(1.08)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;background:rgba(232,53,15,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;cursor:pointer}
.play-btn::after{content:'';border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-card:hover .play-btn{opacity:1}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.8rem}
.video-stats{position:absolute;top:8px;left:8px;display:flex;gap:8px}
.video-stats span{background:rgba(0,0,0,.6);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}
.video-info{padding:14px 16px}
.video-info h3{font-size:1rem;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-info .meta{display:flex;justify-content:space-between;align-items:center;color:#888;font-size:.85rem}
.video-info .meta .views{color:#E8350F}
.video-tag{display:inline-block;background:#FFF0EB;color:#E8350F;padding:2px 10px;border-radius:20px;font-size:.75rem;margin-top:6px}

/* === Category Tabs === */
.cat-tabs{display:flex;justify-content:center;gap:12px;margin-bottom:30px;flex-wrap:wrap}
.cat-tabs .tab{padding:8px 22px;border-radius:25px;background:#e8e7e2;color:#555;cursor:pointer;transition:all .3s;font-size:.9rem}
.cat-tabs .tab:hover,.cat-tabs .tab.active{background:linear-gradient(135deg,#E8350F,#FF6B35);color:#fff}

/* === Feature Modules === */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.feature-card{background:#fff;border-radius:12px;padding:30px 24px;text-align:center;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:all .3s;border:1px solid #eee}
.feature-card:hover{transform:translateY(-4px);border-color:#E8350F;box-shadow:0 8px 25px rgba(232,53,15,.1)}
.feature-icon{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,#FFF0EB,#FFE0D6);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.8rem}
.feature-card h3{font-size:1.1rem;margin-bottom:8px}
.feature-card p{color:#666;font-size:.9rem;line-height:1.6}

/* === Expert Section === */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.08);transition:all .3s;text-align:center}
.expert-card:hover{transform:translateY(-4px);box-shadow:0 8px 25px rgba(0,0,0,.12)}
.expert-avatar{width:120px;height:120px;border-radius:50%;margin:24px auto 16px;overflow:hidden;border:4px solid #E8350F}
.expert-avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h3{font-size:1.1rem;margin-bottom:4px}
.expert-card .role{color:#E8350F;font-size:.85rem;margin-bottom:12px}
.expert-card p{color:#666;font-size:.85rem;padding:0 20px;line-height:1.6}
.expert-card .expert-links{padding:16px 20px;display:flex;gap:10px;justify-content:center}

/* === Brand Wall === */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.brand-wall .brand-item{background:#fff;padding:16px 28px;border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,.06);font-size:1rem;font-weight:700;color:#1A1A2E;transition:all .3s;border:1px solid #eee}
.brand-wall .brand-item:hover{border-color:#E8350F;color:#E8350F}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.05)}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:1rem;transition:background .3s}
.faq-question:hover{background:#FFF0EB}
.faq-question .arrow{transition:transform .3s;color:#E8350F;font-size:1.2rem}
.faq-item.open .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px}
.faq-item.open .faq-answer{max-height:300px;padding:0 24px 18px}
.faq-answer p{color:#666;font-size:.9rem;line-height:1.8}

/* === Reviews === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 16px rgba(0,0,0,.06);position:relative}
.review-card::before{content:'\201C';position:absolute;top:12px;left:16px;font-size:3rem;color:#E8350F;opacity:.2;font-family:Georgia,serif}
.review-stars{color:#FF6B35;margin-bottom:10px;font-size:1rem;letter-spacing:2px}
.review-card p{color:#555;font-size:.9rem;line-height:1.7;margin-bottom:12px;font-style:italic}
.review-author{display:flex;align-items:center;gap:10px}
.review-author .avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#E8350F,#FF6B35);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.9rem}
.review-author .info .name{font-weight:600;font-size:.9rem}
.review-author .info .date{color:#999;font-size:.8rem}

/* === Contact Section === */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.contact-card{background:#fff;border-radius:12px;padding:28px;text-align:center;box-shadow:0 4px 16px rgba(0,0,0,.06)}
.contact-card h4{margin-bottom:12px;font-size:1.05rem}
.contact-card p{color:#666;font-size:.9rem;line-height:1.7}
.contact-card img{max-width:160px;margin:12px auto}

/* === Social Share === */
.share-bar{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:25px;color:#fff;font-size:.9rem;transition:all .3s;cursor:pointer}
.share-btn:hover{transform:translateY(-2px);opacity:.9;color:#fff}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#00A1D6}

/* === How-To Guide === */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px;margin-top:30px}
.howto-step{text-align:center;padding:24px 16px}
.step-num{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#E8350F,#FF6B35);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.3rem;font-weight:800;margin:0 auto 14px}
.howto-step h4{margin-bottom:8px;font-size:1rem}
.howto-step p{color:#666;font-size:.85rem;line-height:1.6}

/* === Footer === */
.site-footer{background:#0d0d1a;color:#999;padding:40px 0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:30px;margin-bottom:30px}
.footer-col h4{color:#fff;font-size:1rem;margin-bottom:14px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:3px;background:#E8350F;border-radius:2px}
.footer-col p,.footer-col a{color:#888;font-size:.85rem;line-height:2}
.footer-col a:hover{color:#E8350F}
.footer-col .qr-img{width:120px;border-radius:8px;margin-top:8px}
.footer-bottom{border-top:1px solid #222;padding-top:20px;text-align:center;font-size:.85rem;color:#666}
.footer-bottom a{color:#888}
.footer-bottom .update-time{margin-top:6px;color:#555}

/* === Breadcrumb === */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#E8350F}
.breadcrumb span{margin:0 6px;color:#ccc}

/* === Community Grid === */
.community-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.community-card{background:linear-gradient(135deg,#1A1A2E,#2a2a4e);border-radius:12px;padding:24px;text-align:center;color:#fff;transition:all .3s;cursor:pointer}
.community-card:hover{transform:translateY(-4px);box-shadow:0 8px 25px rgba(232,53,15,.2)}
.community-card .icon{font-size:2rem;margin-bottom:10px}
.community-card h4{font-size:1rem;margin-bottom:6px;color:#fff}
.community-card p{color:#aaa;font-size:.8rem}

/* === AI Module === */
.ai-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(350px,1fr));gap:24px}
.ai-card{background:linear-gradient(135deg,#0d0d1a,#1a1a3e);border-radius:16px;padding:32px;color:#fff;position:relative;overflow:hidden;transition:all .3s}
.ai-card::before{content:'';position:absolute;top:-50%;right:-50%;width:100%;height:100%;background:radial-gradient(circle,rgba(232,53,15,.1) 0%,transparent 70%);pointer-events:none}
.ai-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(232,53,15,.15)}
.ai-card h3{font-size:1.15rem;margin-bottom:10px;color:#FF6B35}
.ai-card p{color:#aaa;font-size:.9rem;line-height:1.7}

/* === MCP Frontend Mock === */
.mcp-widget{background:#fff;border-radius:12px;padding:20px;box-shadow:0 2px 12px rgba(0,0,0,.06);max-width:400px;margin:20px auto}
.mcp-widget .mcp-header{display:flex;align-items:center;gap:8px;margin-bottom:12px;font-weight:700;color:#1A1A2E}
.mcp-widget .mcp-status{width:10px;height:10px;border-radius:50%;background:#07C160}
.mcp-widget .mcp-input{width:100%;padding:10px;border:1px solid #ddd;border-radius:8px;font-size:.9rem;outline:none}
.mcp-widget .mcp-btn{margin-top:8px;width:100%;padding:10px;background:linear-gradient(135deg,#E8350F,#FF6B35);color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:.9rem}

/* === Responsive === */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;flex-direction:column;width:100%;background:#1A1A2E;position:absolute;top:100%;left:0;z-index:999}
  .main-nav.open{display:flex}
  .main-nav a{padding:14px 20px;border-bottom:1px solid #2a2a4e}
  .nav-toggle{display:block}
  .hero-banner{height:320px}
  .hero-text h1{font-size:1.6rem}
  .hero-overlay{padding:0 20px}
  .section{padding:40px 0}
  .section-title h2{font-size:1.5rem}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
  .ai-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:480px){
  .hero-banner{height:260px}
  .hero-text h1{font-size:1.3rem}
  .video-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .cat-tabs .tab{padding:6px 14px;font-size:.8rem}
}

/* === Utility === */
.text-center{text-align:center}
.mt-20{margin-top:20px}
.mb-20{margin-bottom:20px}
.hidden{display:none!important}

/* === Interference tags styling (hidden) === */
.kkt-noise{position:absolute;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none;z-index:-9999}