/* 大象传媒 - 汽车改装视频社区 全站样式 */
/* Reset & Base */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:#333;background:#f8f9fa;line-height:1.7}
a{color:#c62828;text-decoration:none;transition:color .3s}
a:hover{color:#e53935}
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 10px 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:42px;width:42px;border-radius:50%}
.logo-wrap .brand-name{color:#fff;font-size:22px;font-weight:700;letter-spacing:1px}
.logo-wrap .brand-name span{color:#c62828}

/* Navigation */
.main-nav ul{display:flex;gap:6px}
.main-nav a{color:#ddd;padding:8px 14px;border-radius:4px;font-size:14px;transition:all .3s}
.main-nav a:hover,.main-nav a.active{background:#c62828;color:#fff}
.mobile-menu-btn{display:none;background:none;border:none;color:#fff;font-size:24px;cursor:pointer}

/* Search Bar */
.search-bar{background:#16213e;padding:12px 0}
.search-bar .container{display:flex;justify-content:center}
.search-form{display:flex;max-width:600px;width:100%;border-radius:25px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.2)}
.search-form input{flex:1;padding:10px 20px;border:none;font-size:15px;outline:none;background:#fff}
.search-form button{background:#c62828;color:#fff;border:none;padding:10px 24px;cursor:pointer;font-size:15px;transition:background .3s}
.search-form button:hover{background:#e53935}

/* Hero Banner */
.hero-banner{position:relative;height:520px;overflow:hidden;background:#000}
.hero-banner img{width:100%;height:100%;object-fit:cover;opacity:.7}
.hero-content{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center;color:#fff;z-index:2}
.hero-content h1{font-size:42px;margin-bottom:12px;text-shadow:2px 2px 8px rgba(0,0,0,.7)}
.hero-content p{font-size:18px;max-width:700px;margin:0 auto;text-shadow:1px 1px 4px rgba(0,0,0,.5)}
.hero-content .hero-tags{margin-top:18px;display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.hero-content .hero-tags span{background:rgba(198,40,40,.85);padding:6px 16px;border-radius:20px;font-size:13px}

/* Breadcrumb */
.breadcrumb{padding:12px 0;font-size:13px;color:#888}
.breadcrumb a{color:#666}
.breadcrumb span{margin:0 6px;color:#aaa}

/* Section Titles */
.section-title{text-align:center;margin:40px 0 30px;position:relative}
.section-title h2{font-size:28px;display:inline-block;position:relative;padding-bottom:12px}
.section-title h2::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:#c62828;border-radius:2px}
.section-title p{color:#888;margin-top:10px;font-size:15px}

/* Video Card Grid */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:40px}
.video-card{background:#fff;border-radius:10px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.08);transition:transform .3s,box-shadow .3s}
.video-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,.15)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#000}
.video-thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.video-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;background:rgba(198,40,40,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;cursor:pointer}
.video-card:hover .video-play-btn{opacity:1}
.video-play-btn::after{content:'';border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:3px}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:3px;font-size:12px}
.video-info{padding:14px}
.video-info h3{font-size:15px;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;justify-content:space-between;font-size:12px;color:#999}
.video-stats{display:flex;gap:12px;font-size:12px;color:#999;margin-top:6px}
.video-stats span{display:flex;align-items:center;gap:3px}

/* Module Cards */
.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:40px}
.module-card{background:#fff;border-radius:10px;padding:30px;text-align:center;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:all .3s}
.module-card:hover{transform:translateY(-3px);box-shadow:0 6px 20px rgba(0,0,0,.12)}
.module-card .icon{font-size:40px;margin-bottom:15px}
.module-card h3{font-size:18px;margin-bottom:8px;color:#1a1a2e}
.module-card p{font-size:14px;color:#666;line-height:1.6}

/* Expert Section */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:40px}
.expert-card{background:#fff;border-radius:10px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.06);text-align:center;transition:all .3s}
.expert-card:hover{transform:translateY(-3px)}
.expert-card .expert-avatar{width:100%;height:200px;object-fit:cover}
.expert-card .expert-info{padding:18px}
.expert-card h4{font-size:16px;margin-bottom:4px}
.expert-card .expert-role{color:#c62828;font-size:13px;margin-bottom:8px}
.expert-card p{font-size:13px;color:#666;line-height:1.5}
.expert-card .expert-btns{display:flex;gap:8px;justify-content:center;margin-top:12px}
.expert-card .expert-btns a{padding:6px 14px;border-radius:20px;font-size:12px;border:1px solid #c62828;color:#c62828;transition:all .3s}
.expert-card .expert-btns a:hover{background:#c62828;color:#fff}

/* Partner Logos */
.partner-section{background:#fff;padding:40px 0;margin-bottom:40px}
.partner-section img{max-width:100%;border-radius:10px}

/* FAQ Section */
.faq-section{margin-bottom:40px}
.faq-item{background:#fff;border-radius:8px;margin-bottom:12px;box-shadow:0 1px 6px rgba(0,0,0,.05);overflow:hidden}
.faq-question{padding:16px 20px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .3s}
.faq-question:hover{background:#f5f5f5}
.faq-question::after{content:'+';font-size:20px;color:#c62828;transition:transform .3s}
.faq-item.active .faq-question::after{transform:rotate(45deg)}
.faq-answer{padding:0 20px;max-height:0;overflow:hidden;transition:all .3s;color:#666;font-size:14px;line-height:1.8}
.faq-item.active .faq-answer{padding:0 20px 16px;max-height:500px}

/* Reviews */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-bottom:40px}
.review-card{background:#fff;border-radius:10px;padding:24px;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:48px;height:48px;border-radius:50%;background:#c62828;color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700}
.review-name{font-weight:600;font-size:15px}
.review-date{font-size:12px;color:#999}
.review-stars{color:#f59e0b;margin-bottom:8px;font-size:14px}
.review-text{font-size:14px;color:#555;line-height:1.7}

/* Contact Section */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px;margin-bottom:40px}
.contact-card{background:#fff;border-radius:10px;padding:30px;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.contact-card h3{font-size:20px;margin-bottom:15px;color:#1a1a2e;border-left:4px solid #c62828;padding-left:12px}
.contact-card p{font-size:14px;color:#666;margin-bottom:8px;line-height:1.7}
.contact-card .qr-wrap{display:flex;gap:20px;margin-top:15px}
.contact-card .qr-wrap img{width:140px;height:140px;border-radius:8px;border:1px solid #eee}

/* Share Buttons */
.share-section{text-align:center;margin:30px 0}
.share-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;color:#fff;font-size:13px;transition:opacity .3s}
.share-btn:hover{opacity:.85;color:#fff}
.share-btn.wechat{background:#07c160}
.share-btn.weibo{background:#e6162d}
.share-btn.douyin{background:#161823}
.share-btn.bilibili{background:#00a1d6}

/* Footer */
.site-footer{background:#1a1a2e;color:#aaa;padding:40px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;margin-bottom:30px}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:15px;position:relative;padding-bottom:8px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:#c62828}
.footer-col p,.footer-col a{font-size:13px;color:#999;line-height:2}
.footer-col a:hover{color:#c62828}
.footer-col .footer-logo{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.footer-col .footer-logo img{width:36px;height:36px;border-radius:50%}
.footer-col .footer-logo span{color:#fff;font-size:18px;font-weight:700}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:15px 0;text-align:center;font-size:12px;color:#777}
.footer-bottom a{color:#999}

/* How-To Guide */
.howto-section{margin-bottom:40px}
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.howto-step{background:#fff;border-radius:10px;padding:24px;text-align:center;box-shadow:0 2px 8px rgba(0,0,0,.06);position:relative}
.howto-step .step-num{width:40px;height:40px;background:#c62828;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;margin:0 auto 12px}
.howto-step h4{font-size:16px;margin-bottom:8px}
.howto-step p{font-size:13px;color:#666}

/* Category Tags */
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:30px;justify-content:center}
.tag-cloud a{background:#fff;border:1px solid #ddd;padding:6px 16px;border-radius:20px;font-size:13px;color:#666;transition:all .3s}
.tag-cloud a:hover{background:#c62828;color:#fff;border-color:#c62828}

/* AI Section */
.ai-section{background:linear-gradient(135deg,#0f0c29,#302b63,#24243e);padding:50px 0;margin-bottom:40px;color:#fff}
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:rgba(255,255,255,.08);border-radius:12px;padding:28px;backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.1);transition:all .3s}
.ai-card:hover{background:rgba(255,255,255,.15);transform:translateY(-3px)}
.ai-card .ai-icon{font-size:36px;margin-bottom:12px}
.ai-card h3{font-size:18px;margin-bottom:8px;color:#fff}
.ai-card p{font-size:14px;color:rgba(255,255,255,.7);line-height:1.6}

/* Community Section */
.community-tabs{display:flex;gap:10px;margin-bottom:20px;flex-wrap:wrap;justify-content:center}
.community-tabs button{background:#fff;border:1px solid #ddd;padding:8px 20px;border-radius:20px;cursor:pointer;font-size:14px;transition:all .3s}
.community-tabs button:hover,.community-tabs button.active{background:#c62828;color:#fff;border-color:#c62828}

/* Page Content */
.page-content{padding:30px 0 50px}
.page-content h2{font-size:24px;margin-bottom:20px}
.page-content p{font-size:15px;color:#555;line-height:1.8;margin-bottom:15px}
.content-section{background:#fff;border-radius:10px;padding:30px;margin-bottom:24px;box-shadow:0 2px 12px rgba(0,0,0,.06)}

/* Responsive */
@media(max-width:1024px){
.video-grid{grid-template-columns:repeat(3,1fr)}
.expert-grid{grid-template-columns:repeat(2,1fr)}
.footer-grid{grid-template-columns:repeat(2,1fr)}
.howto-steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
.header-inner{flex-wrap:wrap}
.mobile-menu-btn{display:block}
.main-nav{display:none;width:100%;order:3}
.main-nav.active{display:block}
.main-nav ul{flex-direction:column;padding:10px 0}
.hero-banner{height:320px}
.hero-content h1{font-size:26px}
.hero-content p{font-size:14px}
.video-grid{grid-template-columns:repeat(2,1fr)}
.module-grid{grid-template-columns:1fr}
.ai-grid{grid-template-columns:1fr}
.expert-grid{grid-template-columns:1fr}
.review-grid{grid-template-columns:1fr}
.contact-grid{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr}
.howto-steps{grid-template-columns:1fr}
.search-form{max-width:100%}
}
@media(max-width:480px){
.video-grid{grid-template-columns:1fr}
.hero-banner{height:240px}
.hero-content h1{font-size:22px}
}

/* Interference tags - hidden but present */
div[id^="x"],div[class^="x"]{position:absolute;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none;z-index:-9999}

/* Lazy load placeholder */
.lazy{opacity:0;transition:opacity .5s}
.lazy.loaded{opacity:1}

/* Video overlay effect */
.video-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(transparent 60%,rgba(0,0,0,.6));pointer-events:none}

/* Animation */
@keyframes fadeInUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.animate-in{animation:fadeInUp .6s ease forwards}

/* MCP Frontend placeholder */
.mcp-widget{background:#fff;border-radius:10px;padding:20px;margin:20px 0;box-shadow:0 2px 8px rgba(0,0,0,.06);text-align:center;color:#888;font-size:14px;border:1px dashed #ddd}

/* Price Cards */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:40px}
.price-card{background:#fff;border-radius:12px;padding:32px 24px;text-align:center;box-shadow:0 2px 12px rgba(0,0,0,.06);position:relative;transition:all .3s;border:2px solid transparent}
.price-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,.12)}
.price-card.featured{border-color:#c62828;transform:scale(1.03)}
.price-card.featured:hover{transform:scale(1.03) translateY(-5px)}
.price-badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:#c62828;color:#fff;padding:4px 20px;border-radius:20px;font-size:13px;font-weight:600}
.price-tier{font-size:20px;font-weight:700;color:#1a1a2e;margin-bottom:12px}
.price-amount{font-size:36px;font-weight:800;color:#c62828;margin-bottom:20px}
.price-amount span{font-size:14px;font-weight:400;color:#999}
.price-features{text-align:left;margin-bottom:24px;padding:0 10px}
.price-features li{padding:8px 0;border-bottom:1px solid #f0f0f0;font-size:14px;color:#555;position:relative;padding-left:22px}
.price-features li::before{content:'✓';position:absolute;left:0;color:#c62828;font-weight:700}
.price-btn{display:inline-block;background:#c62828;color:#fff;padding:10px 30px;border-radius:25px;font-size:15px;transition:all .3s;text-decoration:none}
.price-btn:hover{background:#e53935;color:#fff;transform:scale(1.05)}

/* Process Steps */
.process-steps{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin-bottom:40px}
.process-step{background:#fff;border-radius:10px;padding:24px 16px;text-align:center;box-shadow:0 2px 8px rgba(0,0,0,.06);position:relative}
.process-step::after{content:'→';position:absolute;right:-14px;top:50%;transform:translateY(-50%);font-size:20px;color:#c62828;font-weight:700}
.process-step:last-child::after{display:none}
.process-num{width:48px;height:48px;background:linear-gradient(135deg,#c62828,#e53935);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;margin:0 auto 12px}
.process-step h4{font-size:15px;margin-bottom:8px;color:#1a1a2e}
.process-step p{font-size:13px;color:#666;line-height:1.5}

/* Expert Credentials */
.expert-credentials{font-size:12px;color:#c62828;margin-top:8px;padding-top:8px;border-top:1px dashed #eee;line-height:1.6}

/* Page Content Enhancement */
.page-content h1{font-size:28px;margin-bottom:20px;color:#1a1a2e;border-left:4px solid #c62828;padding-left:16px}
.update-note{font-size:13px;color:#999;margin-bottom:30px;padding:10px 16px;background:#f8f9fa;border-radius:6px;border-left:3px solid #c62828}

/* Responsive additions */
@media(max-width:1024px){
.price-grid{grid-template-columns:repeat(2,1fr)}
.process-steps{grid-template-columns:repeat(3,1fr)}
.process-step:nth-child(3)::after{display:none}
}
@media(max-width:768px){
.price-grid{grid-template-columns:1fr}
.price-card.featured{transform:none}
.process-steps{grid-template-columns:1fr}
.process-step::after{display:none}
}