/* ========================================
   91 修车改装视频社区 - 主样式表
   品牌：91 | 域名：wsrLLym.cn
   原创设计 - Tesla风格暗黑主题
   ======================================== */

/* CSS Reset & Base */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#E82127;
  --primary-dark:#B91A1F;
  --accent:#FF6B35;
  --bg-dark:#0F0F1A;
  --bg-card:#1A1A2E;
  --bg-card-hover:#252540;
  --text-white:#FFFFFF;
  --text-gray:#B0B0C0;
  --text-muted:#7A7A8E;
  --gradient:linear-gradient(135deg,#E82127,#FF6B35);
  --shadow:0 8px 32px rgba(0,0,0,0.4);
  --radius:12px;
  --transition:all 0.3s cubic-bezier(0.4,0,0.2,1);
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;background:var(--bg-dark);color:var(--text-white);line-height:1.7;overflow-x:hidden}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto;display:block}
.container{max-width:1280px;margin:0 auto;padding:0 20px}

/* Header & Navigation */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(15,15,26,0.95);backdrop-filter:blur(20px);border-bottom:1px solid rgba(232,33,39,0.2);transition:var(--transition)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:1280px;margin:0 auto}
.logo{display:flex;align-items:center;gap:10px}
.logo img{height:45px;width:auto}
.logo-text{font-size:1.5rem;font-weight:800;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{padding:10px 16px;font-size:0.9rem;color:var(--text-gray);font-weight:500;position:relative;transition:var(--transition)}
.main-nav a:hover,.main-nav a.active{color:var(--text-white)}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:0;height:2px;background:var(--gradient);transition:var(--transition)}
.main-nav a:hover::after,.main-nav a.active::after{width:60%}
.mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.mobile-toggle span{width:24px;height:2px;background:var(--text-white);transition:var(--transition)}

/* Search Bar */
.search-bar{background:var(--bg-card);border-bottom:1px solid rgba(232,33,39,0.1);padding:12px 0;margin-top:70px}
.search-form{display:flex;align-items:center;max-width:600px;margin:0 auto;position:relative}
.search-form input{width:100%;padding:12px 50px 12px 20px;background:rgba(255,255,255,0.05);border:1px solid rgba(232,33,39,0.3);border-radius:50px;color:var(--text-white);font-size:0.95rem;outline:none;transition:var(--transition)}
.search-form input:focus{border-color:var(--primary);box-shadow:0 0 20px rgba(232,33,39,0.2)}
.search-form input::placeholder{color:var(--text-muted)}
.search-form button{position:absolute;right:5px;top:50%;transform:translateY(-50%);background:var(--gradient);border:none;color:#fff;width:38px;height:38px;border-radius:50%;cursor:pointer;font-size:1rem;transition:var(--transition)}
.search-form button:hover{transform:translateY(-50%) scale(1.05)}

/* Banner / Hero Section */
.hero-banner{position:relative;width:100%;min-height:70vh;display:flex;align-items:center;justify-content:center;overflow:hidden}
.hero-banner .hero-bg{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;filter:brightness(0.4)}
.hero-content{position:relative;z-index:2;text-align:center;padding:40px 20px;max-width:800px}
.hero-content h1{font-size:3rem;font-weight:900;margin-bottom:16px;line-height:1.2}
.hero-content h1 .brand{background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-content p{font-size:1.15rem;color:var(--text-gray);margin-bottom:30px;line-height:1.8}
.hero-content .hero-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:28px}
.hero-content .hero-tags span{padding:6px 18px;background:rgba(232,33,39,0.15);border:1px solid rgba(232,33,39,0.3);border-radius:50px;font-size:0.85rem;color:var(--primary)}
.btn-primary{display:inline-block;padding:14px 36px;background:var(--gradient);color:#fff;border:none;border-radius:50px;font-size:1rem;font-weight:600;cursor:pointer;transition:var(--transition);box-shadow:0 4px 20px rgba(232,33,39,0.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(232,33,39,0.5);color:#fff}
.btn-outline{display:inline-block;padding:14px 36px;border:2px solid var(--primary);color:var(--primary);border-radius:50px;font-size:1rem;font-weight:600;cursor:pointer;transition:var(--transition);background:transparent;margin-left:12px}
.btn-outline:hover{background:var(--primary);color:#fff}

/* Section Common */
.section{padding:80px 0}
.section-header{text-align:center;margin-bottom:50px}
.section-header h2{font-size:2.2rem;font-weight:800;margin-bottom:12px}
.section-header h2 .hl{color:var(--primary)}
.section-header p{color:var(--text-gray);font-size:1.05rem;max-width:700px;margin:0 auto}
.section-alt{background:var(--bg-card)}

/* EEAT Certification Bar */
.eeat-bar{padding:40px 0}
.eeat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.eeat-item{text-align:center;padding:24px 16px;background:rgba(232,33,39,0.05);border:1px solid rgba(232,33,39,0.15);border-radius:var(--radius);transition:var(--transition)}
.eeat-item:hover{border-color:var(--primary);transform:translateY(-3px)}
.eeat-item .eeat-icon{font-size:2rem;margin-bottom:8px}
.eeat-item h6{font-size:0.9rem;font-weight:700;margin-bottom:4px;color:var(--text-white)}
.eeat-item p{font-size:0.78rem;color:var(--text-muted)}

/* Video Card Grid */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.video-card{background:var(--bg-card);border-radius:var(--radius);overflow:hidden;transition:var(--transition);border:1px solid rgba(255,255,255,0.05);cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:rgba(232,33,39,0.3)}
.video-thumb{position:relative;width:100%;padding-top:56.25%;overflow:hidden}
.video-thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:var(--transition)}
.video-thumb video.video-preview{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;z-index:1;opacity:0;transition:opacity 0.3s ease}
.video-card:hover .video-thumb video.video-preview{opacity:1}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.video-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;background:rgba(232,33,39,0.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:var(--transition);z-index:3}
.video-play-btn::after{content:'';width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-card:hover .video-play-btn{opacity:1}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,0.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:0.75rem;z-index:3}
.video-info{padding:16px}
.video-info h3{font-size:1rem;font-weight:600;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;align-items:center;gap:16px;color:var(--text-muted);font-size:0.8rem}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.video-tags span{padding:3px 10px;background:rgba(232,33,39,0.1);border-radius:20px;font-size:0.72rem;color:var(--primary)}

/* Short Video Grid (TikTok Style) */
.short-video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.short-video-card{background:var(--bg-card);border-radius:var(--radius);overflow:hidden;transition:var(--transition);border:1px solid rgba(255,255,255,0.05);cursor:pointer}
.short-video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:rgba(232,33,39,0.3)}
.short-video-thumb{position:relative;width:100%;padding-top:177.78%;overflow:hidden}
.short-video-thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:var(--transition)}
.short-video-thumb video.video-preview{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;z-index:1;opacity:0;transition:opacity 0.3s ease}
.short-video-card:hover .short-video-thumb video.video-preview{opacity:1}
.short-video-card:hover .short-video-thumb img{transform:scale(1.05)}
.short-video-card .video-play-btn{opacity:0}
.short-video-card:hover .video-play-btn{opacity:1}
.short-video-card .video-duration{position:absolute;bottom:8px;right:8px;z-index:3}
.short-video-card .video-info{padding:12px}
.short-video-card .video-info h3{font-size:0.9rem}

/* Stats Bar */
.stats-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:40px 0}
.stat-item{text-align:center;padding:30px 20px;background:var(--bg-card);border-radius:var(--radius);border:1px solid rgba(255,255,255,0.05)}
.stat-item .stat-num{font-size:2.5rem;font-weight:900;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-item .stat-label{color:var(--text-gray);font-size:0.9rem;margin-top:6px}

/* Expert Cards */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.expert-card{background:var(--bg-card);border-radius:var(--radius);overflow:hidden;text-align:center;padding:30px 20px;border:1px solid rgba(255,255,255,0.05);transition:var(--transition)}
.expert-card:hover{border-color:rgba(232,33,39,0.3);transform:translateY(-4px)}
.expert-card img{width:120px;height:120px;border-radius:50%;object-fit:cover;margin:0 auto 16px;border:3px solid var(--primary)}
.expert-card h4{font-size:1.1rem;margin-bottom:4px}
.expert-card .role{color:var(--primary);font-size:0.85rem;margin-bottom:12px}
.expert-card p{color:var(--text-gray);font-size:0.85rem;line-height:1.6;margin-bottom:16px}
.expert-card .expert-btns{display:flex;gap:10px;justify-content:center}
.expert-card .expert-btns a{padding:8px 18px;font-size:0.8rem;border-radius:50px}

/* Partner Logo Wall */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:40px;padding:30px 0}
.partner-wall .partner-logo{width:120px;height:60px;background:rgba(255,255,255,0.05);border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:0.85rem;font-weight:600;transition:var(--transition);border:1px solid rgba(255,255,255,0.08)}
.partner-wall .partner-logo:hover{border-color:var(--primary);color:var(--primary)}

/* FAQ Section */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--bg-card);border-radius:var(--radius);margin-bottom:12px;border:1px solid rgba(255,255,255,0.05);overflow:hidden}
.faq-question{padding:20px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:1rem;transition:var(--transition)}
.faq-question:hover{color:var(--primary)}
.faq-question .faq-icon{font-size:1.2rem;transition:var(--transition);color:var(--primary)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:max-height 0.4s ease;color:var(--text-gray);font-size:0.92rem;line-height:1.8}
.faq-item.active .faq-answer{max-height:300px;padding-bottom:20px}
.faq-item.active .faq-icon{transform:rotate(45deg)}

/* Reviews */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.review-card{background:var(--bg-card);border-radius:var(--radius);padding:24px;border:1px solid rgba(255,255,255,0.05)}
.review-card .stars{color:#FFD700;font-size:0.9rem;margin-bottom:10px;letter-spacing:2px}
.review-card .review-text{color:var(--text-gray);font-size:0.92rem;line-height:1.7;margin-bottom:14px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer-avatar{width:40px;height:40px;border-radius:50%;background:var(--gradient);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:0.9rem}
.review-card .reviewer-info .name{font-weight:600;font-size:0.9rem}
.review-card .reviewer-info .date{color:var(--text-muted);font-size:0.78rem}

/* AI Section */
.ai-features{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.ai-feature-card{background:var(--bg-card);border-radius:var(--radius);padding:30px;border:1px solid rgba(255,255,255,0.05);transition:var(--transition);text-align:center}
.ai-feature-card:hover{border-color:rgba(232,33,39,0.3);transform:translateY(-4px)}
.ai-feature-card .ai-icon{font-size:2.5rem;margin-bottom:16px}
.ai-feature-card h4{font-size:1.1rem;margin-bottom:10px}
.ai-feature-card p{color:var(--text-gray);font-size:0.88rem;line-height:1.7}

/* Community Section */
.community-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.community-tag{background:var(--bg-card);border-radius:var(--radius);padding:20px;text-align:center;border:1px solid rgba(255,255,255,0.05);transition:var(--transition);cursor:pointer}
.community-tag:hover{border-color:var(--primary);background:rgba(232,33,39,0.08)}
.community-tag .tag-icon{font-size:2rem;margin-bottom:8px}
.community-tag h5{font-size:0.95rem;margin-bottom:4px}
.community-tag p{color:var(--text-muted);font-size:0.78rem}

/* News Grid */
.news-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(350px,1fr));gap:24px}
.news-card{background:var(--bg-card);border-radius:var(--radius);padding:24px;border:1px solid rgba(255,255,255,0.05);transition:var(--transition)}
.news-card:hover{border-color:rgba(232,33,39,0.3);transform:translateY(-3px)}
.news-card .news-date{font-size:0.78rem;color:var(--primary);margin-bottom:8px;font-weight:600}
.news-card h4{font-size:1.05rem;margin-bottom:10px;font-weight:700;line-height:1.5}
.news-card p{color:var(--text-gray);font-size:0.88rem;line-height:1.7;margin-bottom:12px}

/* How-To Guide */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:24px;max-width:1000px;margin:0 auto}
.howto-step{text-align:center;padding:30px 20px}
.howto-step .step-num{width:50px;height:50px;border-radius:50%;background:var(--gradient);display:flex;align-items:center;justify-content:center;font-size:1.3rem;font-weight:800;margin:0 auto 16px}
.howto-step h4{margin-bottom:8px;font-size:1rem}
.howto-step p{color:var(--text-gray);font-size:0.88rem}

/* Contact Info */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.contact-card{background:var(--bg-card);border-radius:var(--radius);padding:30px;border:1px solid rgba(255,255,255,0.05)}
.contact-card h4{font-size:1.1rem;margin-bottom:16px;color:var(--primary)}
.contact-card p{color:var(--text-gray);font-size:0.9rem;line-height:1.8;margin-bottom:8px}

/* Social Share */
.share-bar{display:flex;justify-content:center;gap:16px;padding:20px 0}
.share-btn{width:60px;height:40px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:0.85rem;transition:var(--transition);border:1px solid rgba(255,255,255,0.1);color:var(--text-gray);cursor:pointer;font-weight:600}
.share-btn:hover{border-color:var(--primary);color:var(--primary);transform:scale(1.08)}

/* Friend Links */
.friend-links{display:flex;flex-wrap:wrap;justify-content:center;gap:16px}
.friend-links a{padding:6px 16px;background:rgba(255,255,255,0.03);border:1px solid rgba(255,255,255,0.08);border-radius:6px;color:var(--text-muted);font-size:0.82rem;transition:var(--transition)}
.friend-links a:hover{border-color:var(--primary);color:var(--primary)}

/* Footer */
.site-footer{background:var(--bg-card);border-top:1px solid rgba(232,33,39,0.2);padding:60px 0 30px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:40px;margin-bottom:40px}
.footer-col h4{font-size:1rem;margin-bottom:16px;color:var(--text-white)}
.footer-col p,.footer-col a{color:var(--text-gray);font-size:0.88rem;line-height:1.8}
.footer-col a{display:block;transition:var(--transition)}
.footer-col a:hover{color:var(--primary);padding-left:4px}
.footer-qr{display:flex;gap:20px;margin-top:12px}
.footer-qr img{width:100px;height:100px;border-radius:8px;border:1px solid rgba(255,255,255,0.1)}
.footer-bottom{text-align:center;padding-top:30px;border-top:1px solid rgba(255,255,255,0.05);color:var(--text-muted);font-size:0.82rem}
.footer-bottom a{color:var(--text-gray)}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:0.85rem;color:var(--text-muted)}
.breadcrumb a{color:var(--text-gray)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb span{margin:0 8px;color:var(--text-muted)}

/* Inner Page Hero */
.inner-hero{padding:100px 0 40px;text-align:center;background:linear-gradient(180deg,rgba(232,33,39,0.08),transparent)}
.inner-hero h1{font-size:2.4rem;font-weight:800;margin-bottom:12px}
.inner-hero p{color:var(--text-gray);font-size:1.05rem;max-width:600px;margin:0 auto}

/* Back to Top */
.back-to-top{position:fixed;bottom:40px;right:30px;width:46px;height:46px;background:var(--gradient);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.1rem;cursor:pointer;opacity:0;visibility:hidden;transition:var(--transition);z-index:999;box-shadow:0 4px 16px rgba(232,33,39,0.4)}
.back-to-top.visible{opacity:1;visibility:visible}
.back-to-top:hover{transform:translateY(-3px);box-shadow:0 6px 24px rgba(232,33,39,0.5)}

/* Video Modal */
.video-modal{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.92);z-index:2000;display:none;align-items:center;justify-content:center}
.video-modal.active{display:flex}
.video-modal-content{width:90%;max-width:900px;position:relative}
.video-modal-close{position:absolute;top:-40px;right:0;font-size:2rem;color:#fff;cursor:pointer;transition:var(--transition)}
.video-modal-close:hover{color:var(--primary);transform:scale(1.2)}
.video-modal-player video{width:100%;border-radius:var(--radius);background:#000}
.video-modal-info{padding:16px 0;color:var(--text-gray)}
.video-modal-info h3{font-size:1.2rem;color:var(--text-white);margin-bottom:6px}
.video-modal-info p{font-size:0.9rem}

/* Legal Pages */
.legal-content{max-width:800px;margin:0 auto;padding:40px 20px}
.legal-content h2{font-size:1.6rem;margin:30px 0 16px;color:var(--text-white)}
.legal-content h3{font-size:1.2rem;margin:24px 0 12px;color:var(--text-white)}
.legal-content p{color:var(--text-gray);font-size:0.92rem;line-height:1.8;margin-bottom:12px}
.legal-content ul{color:var(--text-gray);font-size:0.92rem;line-height:2;margin-left:20px;margin-bottom:16px}

/* 404 Page */
.error-page{min-height:60vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:100px 20px}
.error-page h1{font-size:8rem;font-weight:900;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1}
.error-page h2{font-size:1.8rem;margin:16px 0}
.error-page p{color:var(--text-gray);margin-bottom:30px}

/* JSON-LD Hidden */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* Lazy Load */
.lazy{opacity:0;transition:opacity 0.5s ease}
.lazy.loaded{opacity:1}

/* Responsive */
@media(max-width:1024px){
  .stats-bar{grid-template-columns:repeat(2,1fr)}
  .hero-content h1{font-size:2.2rem}
  .eeat-grid{grid-template-columns:repeat(2,1fr)}
  .short-video-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:100%;left:0;width:100%;background:rgba(15,15,26,0.98);flex-direction:column;padding:20px;border-top:1px solid rgba(232,33,39,0.2)}
  .main-nav.active{display:flex}
  .mobile-toggle{display:flex}
  .hero-content h1{font-size:1.8rem}
  .hero-content p{font-size:0.95rem}
  .section{padding:50px 0}
  .section-header h2{font-size:1.6rem}
  .video-grid{grid-template-columns:1fr}
  .short-video-grid{grid-template-columns:repeat(2,1fr)}
  .stats-bar{grid-template-columns:repeat(2,1fr);gap:12px}
  .eeat-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .footer-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .news-grid{grid-template-columns:1fr}
  .btn-outline{margin-left:0;margin-top:10px}
}
@media(max-width:480px){
  .hero-content h1{font-size:1.5rem}
  .stat-item .stat-num{font-size:1.8rem}
  .container{padding:0 15px}
  .short-video-grid{grid-template-columns:1fr}
  .eeat-grid{grid-template-columns:1fr}
}