/* 蘑菇视频 - 汽车改装视频社区 原创样式 */
/* 配色：赛道橙 #FF8C32 / 机甲灰 #1A1D23 / 涡轮蓝 #2196F3 / 碳纤维黑 #0D0F12 */
:root{--primary:#FF8C32;--primary-dark:#E67A20;--secondary:#2196F3;--bg-dark:#0D0F12;--bg-card:#1A1D23;--bg-section:#12141A;--text-main:#E8E8EC;--text-sub:#9A9FB0;--gold:#FFD700;--border:#2A2D35;--radius:10px;--shadow:0 4px 20px rgba(0,0,0,.4)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg-dark);color:var(--text-main);line-height:1.7}
a{color:var(--primary);text-decoration:none;transition:color .3s}
a:hover{color:var(--secondary)}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
/* Header */
.site-header{background:rgba(13,15,18,.96);position:sticky;top:0;z-index:1000;border-bottom:1px solid var(--border);backdrop-filter:blur(12px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:8px}
.logo img{height:48px;width:auto}
.main-nav{display:flex;gap:6px}
.main-nav a{color:var(--text-main);padding:8px 14px;border-radius:6px;font-size:.9rem;transition:all .3s}
.main-nav a:hover,.main-nav a.active{background:var(--primary);color:#fff}
.mobile-toggle{display:none;background:none;border:none;color:var(--text-main);font-size:1.5rem;cursor:pointer}
/* Search */
.search-wrapper{background:var(--bg-section);padding:14px 0;border-bottom:1px solid var(--border)}
.search-bar{display:flex;max-width:600px;margin:0 auto}
.search-bar input{flex:1;padding:10px 18px;border:2px solid var(--border);border-right:none;border-radius:var(--radius) 0 0 var(--radius);background:var(--bg-card);color:var(--text-main);font-size:.95rem;outline:none;transition:border-color .3s}
.search-bar input:focus{border-color:var(--primary)}
.search-bar button{padding:10px 24px;background:var(--primary);color:#fff;border:none;border-radius:0 var(--radius) var(--radius) 0;cursor:pointer;font-size:.95rem;transition:background .3s}
.search-bar button:hover{background:var(--primary-dark)}
/* Hero Slider */
.hero{position:relative;height:520px;overflow:hidden}
.hero-slider{position:relative;height:100%}
.hero-slide{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;transition:opacity 1s}
.hero-slide.active{opacity:1}
.hero-slide img{width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,15,18,.8),rgba(13,15,18,.3))}
.hero-content{position:absolute;bottom:80px;left:60px;z-index:2;max-width:650px}
.hero-content h1{font-size:2.6rem;font-weight:800;margin-bottom:12px;text-shadow:0 2px 8px rgba(0,0,0,.6)}
.hero-content p{font-size:1.1rem;color:var(--text-sub);margin-bottom:20px}
.hero-dots{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:3}
.hero-dots span{width:12px;height:12px;border-radius:50%;background:rgba(255,255,255,.35);cursor:pointer;transition:all .3s}
.hero-dots span.active{background:var(--primary);transform:scale(1.2)}
/* Buttons */
.btn{display:inline-block;padding:12px 28px;border-radius:var(--radius);font-weight:600;cursor:pointer;transition:all .3s;border:none;font-size:.95rem}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);color:#fff;transform:translateY(-2px)}
.btn-outline{border:2px solid var(--primary);color:var(--primary);background:transparent}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-blue{background:var(--secondary);color:#fff}
.btn-blue:hover{background:#1976D2;color:#fff}
/* Sections */
.section{padding:60px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;font-weight:700;margin-bottom:8px}
.section-title p{color:var(--text-sub);font-size:1rem}
.content-section{background:var(--bg-section)}
/* Video Cards */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.video-card{background:var(--bg-card);border-radius:var(--radius);overflow:hidden;transition:transform .3s,box-shadow .3s;border:1px solid var(--border)}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden}
.video-thumb img,.video-thumb video{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}
.video-poster{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;z-index:1}
.video-player{position:absolute;top:0;left:0;width:100%;height:100%;z-index:0}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:2;opacity:0;transition:opacity .3s}
.video-card:hover .play-btn{opacity:1}
.play-icon{display:block;width:56px;height:56px;background:rgba(255,140,50,.9);border-radius:50%;position:relative}
.play-icon::after{content:'';position:absolute;top:50%;left:54%;transform:translate(-50%,-50%);border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem;z-index:2}
.video-tag{position:absolute;top:8px;left:8px;background:var(--primary);color:#fff;padding:2px 10px;border-radius:4px;font-size:.75rem;z-index:2}
.video-info{padding:14px}
.video-info h3{font-size:.95rem;font-weight:600;margin-bottom:6px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;justify-content:space-between;color:var(--text-sub);font-size:.8rem}
/* Service Grid */
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-card{background:var(--bg-card);border-radius:var(--radius);padding:30px;text-align:center;border:1px solid var(--border);transition:all .3s}
.service-card:hover{border-color:var(--primary);transform:translateY(-4px)}
.service-icon{font-size:2.4rem;margin-bottom:16px}
.service-card h3{font-size:1.1rem;margin-bottom:10px}
.service-card p{color:var(--text-sub);font-size:.9rem}
/* AI Section */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:linear-gradient(135deg,var(--bg-card),#1E2230);border-radius:var(--radius);padding:28px;border:1px solid var(--border);transition:all .3s}
.ai-card:hover{border-color:var(--secondary)}
.ai-icon{font-size:2rem;margin-bottom:14px;color:var(--secondary)}
.ai-card h3{margin-bottom:8px;font-size:1.05rem}
.ai-card p{color:var(--text-sub);font-size:.88rem}
/* Expert */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:var(--bg-card);border-radius:var(--radius);padding:24px;text-align:center;border:1px solid var(--border);transition:all .3s}
.expert-card:hover{border-color:var(--primary)}
.expert-avatar{width:90px;height:90px;border-radius:50%;margin:0 auto 14px;object-fit:cover;border:3px solid var(--primary)}
.expert-card h4{font-size:1rem;margin-bottom:4px}
.role{color:var(--primary);font-size:.85rem;margin-bottom:8px}
.expert-edu{color:var(--text-sub);font-size:.8rem;margin-bottom:10px}
.expert-links{display:flex;justify-content:center;gap:8px}
.expert-links a{font-size:.8rem;padding:4px 12px;border:1px solid var(--border);border-radius:4px;color:var(--text-sub)}
.expert-links a:hover{border-color:var(--primary);color:var(--primary)}
/* Brand Wall */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:20px;margin-bottom:30px}
.brand-item{background:var(--bg-card);padding:16px 28px;border-radius:var(--radius);border:1px solid var(--border);font-weight:600;color:var(--text-sub);transition:all .3s}
.brand-item:hover{border-color:var(--primary);color:var(--primary)}
/* HowTo */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.howto-step{background:var(--bg-card);border-radius:var(--radius);padding:24px;text-align:center;border:1px solid var(--border);position:relative}
.howto-step .step-num{display:inline-block;width:40px;height:40px;line-height:40px;border-radius:50%;background:var(--primary);color:#fff;font-weight:700;font-size:1.1rem;margin-bottom:12px}
.howto-step h4{margin-bottom:8px;font-size:.95rem}
.howto-step p{color:var(--text-sub);font-size:.85rem}
/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--bg-card);border-radius:var(--radius);margin-bottom:12px;border:1px solid var(--border);overflow:hidden}
.faq-question{padding:16px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;transition:background .3s}
.faq-question:hover{background:rgba(255,140,50,.08)}
.faq-question::after{content:'+';font-size:1.3rem;color:var(--primary);transition:transform .3s}
.faq-item.active .faq-question::after{transform:rotate(45deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease}
.faq-answer-inner{padding:0 20px 16px;color:var(--text-sub);font-size:.9rem;line-height:1.8}
/* Reviews */
.review-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.review-card{background:var(--bg-card);border-radius:var(--radius);padding:20px;border:1px solid var(--border)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:var(--primary);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem}
.review-name{font-weight:600;font-size:.9rem}
.review-stars{color:var(--gold);font-size:.85rem}
.review-text{color:var(--text-sub);font-size:.88rem;line-height:1.7;margin-bottom:10px}
.review-date{color:var(--text-sub);font-size:.75rem;text-align:right}
/* Stats */
.stats-bar{background:linear-gradient(90deg,var(--primary),var(--secondary));padding:30px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center;color:#fff}
.stat-item h3{font-size:2rem;font-weight:800}
.stat-item p{font-size:.9rem;opacity:.9}
/* Community */
.community-features{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.community-card{background:var(--bg-card);border-radius:var(--radius);padding:24px;border:1px solid var(--border);text-align:center;transition:all .3s}
.community-card:hover{border-color:var(--primary)}
.community-card h3{margin:12px 0 8px;font-size:1rem}
.community-card p{color:var(--text-sub);font-size:.88rem}
/* Share */
.share-bar{display:flex;justify-content:center;gap:12px;margin-top:20px}
.share-btn{padding:8px 18px;border-radius:6px;color:#fff;font-size:.85rem;cursor:pointer;transition:opacity .3s}
.share-btn:hover{opacity:.85;color:#fff}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#00A1D6}
/* Contact */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.contact-card{background:var(--bg-card);border-radius:var(--radius);padding:28px;border:1px solid var(--border)}
.contact-card h3{margin-bottom:16px;font-size:1.1rem;color:var(--primary)}
/* Footer */
.site-footer{background:var(--bg-card);border-top:1px solid var(--border);padding:40px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}
.footer-brand{display:flex;flex-direction:column;gap:12px}
.footer-brand img{height:48px;width:auto}
.footer-brand p{color:var(--text-sub);font-size:.88rem}
.footer-col h4{font-size:1rem;margin-bottom:14px;color:var(--primary)}
.footer-col a{display:block;color:var(--text-sub);font-size:.88rem;margin-bottom:8px}
.footer-col a:hover{color:var(--primary)}
.footer-qr{display:flex;gap:16px;justify-content:center}
.qr-item{text-align:center}
.qr-item img{width:120px;height:120px;border-radius:8px;margin-bottom:6px}
.qr-item p{font-size:.8rem;color:var(--text-sub)}
.footer-bottom{border-top:1px solid var(--border);padding:16px 0;text-align:center;color:var(--text-sub);font-size:.82rem}
.update-badge{display:inline-block;background:var(--primary);color:#fff;padding:2px 10px;border-radius:4px;font-size:.75rem;margin-left:8px}
/* Breadcrumb */
.breadcrumb{padding:14px 0;font-size:.85rem}
.breadcrumb-list{display:flex;gap:8px;align-items:center;color:var(--text-sub)}
.breadcrumb-list a{color:var(--text-sub)}
.breadcrumb-list a:hover{color:var(--primary)}
/* Page Hero */
.page-hero{background:linear-gradient(135deg,var(--bg-card),var(--bg-section));padding:50px 0;text-align:center;border-bottom:1px solid var(--border)}
.page-hero h1{font-size:2.2rem;margin-bottom:10px}
.page-hero p{color:var(--text-sub);font-size:1rem}
/* Social Links */
.social-links{display:flex;gap:12px;margin-top:10px}
.social-links a{color:var(--text-sub);font-size:.85rem;padding:4px 10px;border:1px solid var(--border);border-radius:4px}
.social-links a:hover{color:var(--primary);border-color:var(--primary)}
/* Fade animation */
.fade-in-trigger{opacity:0;transform:translateY(20px);transition:opacity .6s,transform .6s}
.fade-in{opacity:1;transform:translateY(0)}
/* Responsive */
@media(max-width:1024px){
.video-grid{grid-template-columns:repeat(3,1fr)}
.expert-grid{grid-template-columns:repeat(2,1fr)}
.review-grid{grid-template-columns:repeat(2,1fr)}
.howto-steps{grid-template-columns:repeat(2,1fr)}
.footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
.header-inner{flex-wrap:wrap}
.mobile-toggle{display:block}
.main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}
.main-nav.open{display:flex}
.hero{height:360px}
.hero-content{bottom:40px;left:20px;right:20px}
.hero-content h1{font-size:1.6rem}
.video-grid{grid-template-columns:repeat(2,1fr)}
.service-grid,.ai-grid,.community-features{grid-template-columns:1fr}
.stats-grid{grid-template-columns:repeat(2,1fr)}
.contact-grid{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr}
.search-bar{margin:0 10px}
}
@media(max-width:480px){
.video-grid{grid-template-columns:1fr}
.review-grid{grid-template-columns:1fr}
.howto-steps{grid-template-columns:1fr}
.stats-grid{grid-template-columns:1fr}
.hero{height:280px}
}