/* 媚黑汽车改装视频社区 - 原创样式 */
/* 原创配色：赛车红#DC3220 深灰#1A1A2E 碳纤维黑#0F0F1A 银色#C0C0C0 橙色#FF6B00 */
:root{--primary:#DC3220;--primary-dark:#A82518;--secondary:#FF6B00;--bg-dark:#0F0F1A;--bg-card:#1A1A2E;--bg-light:#F5F5F7;--text-main:#E8E8EC;--text-dark:#1A1A2E;--text-muted:#8A8A9A;--silver:#C0C0C0;--border:#2A2A3E;--radius:10px;--shadow:0 4px 20px rgba(0,0,0,.3);--transition:all .3s ease}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg-dark);color:var(--text-main);line-height:1.7;overflow-x:hidden}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--secondary)}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* 顶部信息栏 */
.top-bar{background:#0A0A14;padding:6px 0;font-size:13px;color:var(--text-muted);border-bottom:1px solid var(--border)}
.top-bar .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap}
.top-bar-links a{color:var(--text-muted);margin-left:18px;font-size:12px}
.top-bar-links a:hover{color:var(--primary)}

/* 主导航 */
.site-header{background:rgba(15,15,26,.95);backdrop-filter:blur(12px);position:sticky;top:0;z-index:1000;border-bottom:1px solid var(--border);padding:0}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.site-logo{display:flex;align-items:center;gap:10px;color:var(--text-main);font-weight:700}
.site-logo:hover{color:var(--primary)}
.logo-img{width:40px;height:40px;border-radius:8px}
.logo-text{font-size:20px;font-weight:800;color:var(--primary);line-height:1.2}
.logo-sub{font-size:11px;color:var(--text-muted);font-weight:400}
.main-nav{display:flex;gap:4px;align-items:center}
.main-nav a{color:var(--text-main);padding:8px 14px;border-radius:6px;font-size:14px;font-weight:500;white-space:nowrap;transition:var(--transition)}
.main-nav a:hover,.main-nav a.active{background:var(--primary);color:#fff}
.nav-highlight{background:var(--secondary)!important;color:#fff!important;font-weight:600!important}
.header-search{position:relative;flex-shrink:0}
.header-search input{background:var(--bg-card);border:1px solid var(--border);color:var(--text-main);padding:8px 36px 8px 14px;border-radius:20px;width:200px;font-size:13px;outline:none;transition:var(--transition)}
.header-search input:focus{border-color:var(--primary);width:260px}
.header-search button{position:absolute;right:8px;top:50%;transform:translateY(-50%);background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px}
.search-hint{position:absolute;top:100%;left:0;right:0;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;margin-top:4px;display:none;z-index:100;padding:8px 0}
.search-hint.active{display:block}
.search-hint-item{padding:8px 14px;cursor:pointer;font-size:13px}
.search-hint-item:hover{background:var(--primary);color:#fff}
.menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.menu-toggle span{display:block;width:24px;height:2px;background:var(--text-main);transition:var(--transition)}

/* Hero Banner */
.hero-section{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden;background:var(--bg-dark)}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.5)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(15,15,26,.85),rgba(220,50,32,.3))}
.hero-content{position:relative;z-index:2;max-width:680px;padding:60px 0}
.hero-content h1{font-size:42px;font-weight:900;line-height:1.25;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.5)}
.hero-content h1 span{color:var(--primary)}
.hero-desc{font-size:17px;color:var(--silver);margin-bottom:28px;line-height:1.8}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn-primary{background:var(--primary);color:#fff;padding:12px 32px;border-radius:8px;font-weight:600;font-size:15px;border:none;cursor:pointer;transition:var(--transition);display:inline-flex;align-items:center;gap:8px}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);color:#fff}
.btn-outline{background:transparent;color:var(--text-main);padding:12px 32px;border-radius:8px;font-weight:600;font-size:15px;border:2px solid var(--silver);cursor:pointer;transition:var(--transition);display:inline-flex;align-items:center;gap:8px}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.hero-stats{display:flex;gap:40px;margin-top:36px}
.hero-stat-item{text-align:center}
.hero-stat-num{font-size:28px;font-weight:800;color:var(--primary)}
.hero-stat-label{font-size:12px;color:var(--text-muted);margin-top:2px}

/* 通用Section */
.section{padding:60px 0}
.section-dark{background:var(--bg-dark)}
.section-alt{background:var(--bg-card)}
.section-header{text-align:center;margin-bottom:40px}
.section-header h2{font-size:30px;font-weight:800;margin-bottom:10px}
.section-header h2 span{color:var(--primary)}
.section-header p{color:var(--text-muted);font-size:15px;max-width:600px;margin:0 auto}
.section-header h3{font-size:22px;font-weight:700;margin-bottom:8px}
.section-header h4{font-size:18px;font-weight:600;color:var(--silver)}

/* 视频卡片网格 */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:var(--bg-card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:var(--transition);position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--primary)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#111}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:var(--transition)}
.video-card:hover .video-thumb img{transform:scale(1.06)}
.video-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(.8);width:56px;height:56px;background:rgba(220,50,32,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:var(--transition);cursor:pointer;z-index:2}
.video-card:hover .video-play-btn{opacity:1;transform:translate(-50%,-50%) scale(1)}
.video-play-btn svg{fill:#fff;width:22px;height:22px;margin-left:3px}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px;font-weight:600;z-index:2}
.video-tag{position:absolute;top:8px;left:8px;background:var(--primary);color:#fff;padding:2px 10px;border-radius:4px;font-size:11px;font-weight:600;z-index:2}
.video-info{padding:14px}
.video-title{font-size:15px;font-weight:600;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.5}
.video-meta{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--text-muted)}
.video-meta-left{display:flex;gap:12px;align-items:center}
.video-views,.video-likes{display:flex;align-items:center;gap:3px}

/* 分类标签 */
.cat-tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:28px;justify-content:center}
.cat-tab{padding:8px 20px;border-radius:20px;background:var(--bg-card);border:1px solid var(--border);color:var(--text-muted);font-size:13px;cursor:pointer;transition:var(--transition);font-weight:500}
.cat-tab:hover,.cat-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* 专家卡片 */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:var(--bg-card);border-radius:var(--radius);padding:28px;text-align:center;border:1px solid var(--border);transition:var(--transition)}
.expert-card:hover{border-color:var(--primary);transform:translateY(-4px)}
.expert-avatar{width:90px;height:90px;border-radius:50%;margin:0 auto 14px;object-fit:cover;border:3px solid var(--primary)}
.expert-name{font-size:18px;font-weight:700;margin-bottom:4px}
.expert-title{font-size:13px;color:var(--text-muted);margin-bottom:10px}
.expert-desc{font-size:13px;color:var(--silver);line-height:1.6;margin-bottom:14px}
.expert-tags{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;margin-bottom:14px}
.expert-tag{background:rgba(220,50,32,.15);color:var(--primary);padding:3px 10px;border-radius:12px;font-size:11px}
.expert-btns{display:flex;gap:8px;justify-content:center}
.expert-btn{padding:6px 16px;border-radius:6px;font-size:12px;font-weight:600;cursor:pointer;transition:var(--transition);border:none}
.expert-btn-primary{background:var(--primary);color:#fff}
.expert-btn-outline{background:transparent;border:1px solid var(--border);color:var(--text-muted)}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:15px;transition:var(--transition);width:100%;margin:0;line-height:1.5;background:none;border:none;color:var(--text-main);text-align:left}
h5.faq-question{font-size:15px;margin:0;line-height:1.5}
.faq-question:hover{color:var(--primary)}
.faq-arrow{transition:var(--transition);flex-shrink:0;color:var(--text-muted)}
.faq-item.active .faq-arrow{transform:rotate(180deg);color:var(--primary)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .3s ease;color:var(--silver);font-size:14px;line-height:1.8}
.faq-item.active .faq-answer{max-height:300px;padding-bottom:18px}

/* 用户评论 */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:44px;height:44px;border-radius:50%;object-fit:cover}
.review-user-name{font-weight:600;font-size:14px}
.review-user-tag{font-size:11px;color:var(--text-muted)}
.review-stars{color:var(--secondary);font-size:14px;margin-bottom:8px}
.review-text{font-size:14px;color:var(--silver);line-height:1.7}
.review-date{font-size:11px;color:var(--text-muted);margin-top:10px}

/* 合作品牌 */
.partner-wall{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;align-items:center}
.partner-item{background:var(--bg-card);border:1px solid var(--border);border-radius:8px;padding:16px 28px;font-size:14px;font-weight:600;color:var(--silver);transition:var(--transition)}
.partner-item:hover{border-color:var(--primary);color:var(--primary)}

/* 联系我们 */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.contact-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center}
.contact-icon{font-size:32px;margin-bottom:10px}
.contact-label{font-size:13px;color:var(--text-muted);margin-bottom:6px}
.contact-value{font-size:15px;font-weight:600}

/* 社交分享 */
.share-bar{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;margin-top:20px}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;font-size:13px;font-weight:500;border:1px solid var(--border);color:var(--text-muted);transition:var(--transition);cursor:pointer}
.share-btn:hover{border-color:var(--primary);color:var(--primary)}

/* 标签云 */
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.tag-item{background:var(--bg-card);border:1px solid var(--border);padding:6px 16px;border-radius:16px;font-size:13px;color:var(--silver);transition:var(--transition)}
.tag-item:hover{border-color:var(--primary);color:var(--primary)}

/* How-To指南 */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}
.howto-step{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center}
.howto-num{width:44px;height:44px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;margin:0 auto 12px}
.howto-title{font-weight:700;margin-bottom:6px;font-size:15px}
.howto-desc{font-size:13px;color:var(--text-muted);line-height:1.6}

/* 面包屑 */
.breadcrumb{padding:14px 0;font-size:13px;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb-sep{margin:0 8px;color:var(--border)}

/* 侧边栏 */
.page-layout{display:grid;grid-template-columns:1fr 300px;gap:30px}
.sidebar{display:flex;flex-direction:column;gap:20px}
.sidebar-widget{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.sidebar-widget h4{font-size:16px;font-weight:700;margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--primary)}

/* 页脚 */
.site-footer{background:#0A0A14;border-top:1px solid var(--border);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:40px}
.footer-brand .logo-text{font-size:22px;margin-bottom:8px}
.footer-brand p{font-size:13px;color:var(--text-muted);line-height:1.7;margin-top:10px}
.footer-col h4{font-size:15px;font-weight:700;margin-bottom:14px;color:var(--text-main)}
.footer-col a{display:block;color:var(--text-muted);font-size:13px;padding:4px 0;transition:var(--transition)}
.footer-col a:hover{color:var(--primary);padding-left:4px}
.footer-bottom{border-top:1px solid var(--border);padding:20px 0;text-align:center;font-size:12px;color:var(--text-muted)}
.footer-bottom a{color:var(--text-muted);margin:0 8px}
.footer-bottom a:hover{color:var(--primary)}

/* 回到顶部 */
.back-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transition:var(--transition);z-index:999;border:none;font-size:18px}
.back-top.visible{opacity:1;visibility:visible}
.back-top:hover{background:var(--primary-dark);transform:translateY(-3px)}

/* 通知弹窗 */
.notification{position:fixed;bottom:80px;left:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:14px 20px;z-index:998;max-width:320px;box-shadow:var(--shadow);transform:translateX(-120%);transition:transform .4s ease;font-size:13px}
.notification.show{transform:translateX(0)}
.notification-close{position:absolute;top:6px;right:10px;background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:16px}

/* 视频弹窗 */
.video-modal{position:fixed;inset:0;background:rgba(0,0,0,.85);z-index:2000;display:none;align-items:center;justify-content:center}
.video-modal.active{display:flex}
.video-modal-inner{background:var(--bg-card);border-radius:var(--radius);padding:20px;max-width:800px;width:90%;position:relative}
.video-modal-close{position:absolute;top:-12px;right:-12px;width:36px;height:36px;background:var(--primary);color:#fff;border:none;border-radius:50%;cursor:pointer;font-size:18px;display:flex;align-items:center;justify-content:center}
.video-modal-placeholder{background:#111;border-radius:8px;padding-top:56.25%;position:relative}
.video-modal-placeholder p{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:var(--text-muted);font-size:14px}

/* 弹幕 */
.danmu-container{position:relative;height:200px;overflow:hidden;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border)}
.danmu-item{position:absolute;white-space:nowrap;font-size:14px;color:var(--silver);animation:danmuScroll 10s linear forwards}
@keyframes danmuScroll{from{left:100%}to{left:-100%}}

/* EEAT信任 */
.eeat-bar{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 24px;display:flex;justify-content:space-around;flex-wrap:wrap;gap:14px;margin:30px 0}
.eeat-item{text-align:center;font-size:13px}
.eeat-num{font-size:22px;font-weight:800;color:var(--primary)}
.eeat-label{color:var(--text-muted);font-size:11px}

/* 响应式 */
@media(max-width:1024px){
.page-layout{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
.header-inner{flex-wrap:wrap;height:auto;padding:10px 0}
.main-nav{display:none;flex-direction:column;width:100%;padding:10px 0;border-top:1px solid var(--border)}
.main-nav.active{display:flex}
.menu-toggle{display:flex}
.header-search{width:100%;margin-top:8px}
.header-search input{width:100%}
.header-search input:focus{width:100%}
.hero-content h1{font-size:28px}
.hero-stats{gap:20px}
.hero-stat-num{font-size:22px}
.section-header h2{font-size:24px}
.video-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
.expert-grid{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr}
.top-bar .container{flex-direction:column;text-align:center;gap:4px}
}
@media(max-width:480px){
.hero-content{padding:40px 0}
.hero-content h1{font-size:24px}
.hero-btns{flex-direction:column}
.btn-primary,.btn-outline{width:100%;justify-content:center}
.video-grid{grid-template-columns:1fr}
.contact-grid{grid-template-columns:1fr}
.review-grid{grid-template-columns:1fr}
}