/* ===================================================
   91修车改装 - 官方网站样式表
   品牌色：深炭黑 #1a1a1a | 赛道红 #e8001d | 钢铁银 #c0c0c0
   域名：corsa.com.cn
   =================================================== */

/* ---- 重置与基础 ---- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;background:#111;color:#e0e0e0;line-height:1.7;min-height:100vh}
a{color:#e8001d;text-decoration:none;transition:color .25s}
a:hover{color:#ff3352}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}
button{cursor:pointer;border:none;background:none;font-family:inherit}

/* ---- 布局容器 ---- */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:60px 0}
.section-dark{background:#0d0d0d}
.section-mid{background:#161616}

/* ---- 标题样式 ---- */
.section-title{font-size:2rem;font-weight:800;color:#fff;text-align:center;margin-bottom:10px;letter-spacing:1px}
.section-title span{color:#e8001d}
.section-subtitle{text-align:center;color:#888;margin-bottom:40px;font-size:1rem}
.section-title::after{content:'';display:block;width:60px;height:3px;background:linear-gradient(90deg,#e8001d,#ff6b35);margin:12px auto 0;border-radius:2px}

/* ---- 顶部导航 ---- */
.site-header{position:sticky;top:0;z-index:1000;background:rgba(17,17,17,.97);border-bottom:2px solid #e8001d;backdrop-filter:blur(8px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:20px}
.brand-logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.nav-favicon{width:36px;height:36px;object-fit:contain;border-radius:6px}
.nav-logo{height:44px;width:auto;object-fit:contain}
.main-nav ul{display:flex;gap:4px;align-items:center}
.main-nav ul li a{padding:7px 13px;border-radius:4px;font-size:.9rem;font-weight:600;color:#ccc;transition:all .2s;white-space:nowrap}
.main-nav ul li a:hover,.main-nav ul li a.active{background:#e8001d;color:#fff}
.mobile-menu-toggle{display:none;flex-direction:column;gap:5px;padding:6px}
.mobile-menu-toggle span{display:block;width:24px;height:2px;background:#ccc;border-radius:2px;transition:all .3s}
.mobile-menu-toggle.open span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.mobile-menu-toggle.open span:nth-child(2){opacity:0}
.mobile-menu-toggle.open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* ---- 搜索栏 ---- */
.search-bar-wrap{background:#161616;border-bottom:1px solid #222;padding:10px 0}
.search-bar-inner{display:flex;align-items:center;gap:10px;max-width:700px;margin:0 auto;padding:0 20px}
.search-input{flex:1;background:#222;border:1px solid #333;border-radius:24px;padding:9px 20px;color:#e0e0e0;font-size:.95rem;outline:none;transition:border-color .2s}
.search-input:focus{border-color:#e8001d}
.search-input::placeholder{color:#666}
.search-submit{background:#e8001d;color:#fff;border-radius:24px;padding:9px 22px;font-size:.9rem;font-weight:700;transition:background .2s;flex-shrink:0}
.search-submit:hover{background:#c0001a}

/* ---- Hero Banner ---- */
.hero-section{position:relative;height:520px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:brightness(.45)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(232,0,29,.18) 0%,rgba(0,0,0,.6) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;padding:0 20px}
.hero-content h1{font-size:3rem;font-weight:900;color:#fff;letter-spacing:2px;text-shadow:0 2px 20px rgba(0,0,0,.8);margin-bottom:16px}
.hero-content h1 span{color:#e8001d}
.hero-content p{font-size:1.15rem;color:#ddd;max-width:600px;margin:0 auto 28px;text-shadow:0 1px 8px rgba(0,0,0,.7)}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn-primary{background:#e8001d;color:#fff;padding:13px 32px;border-radius:4px;font-weight:700;font-size:1rem;transition:all .2s;display:inline-flex;align-items:center;gap:6px}
.btn-primary:hover{background:#c0001a;color:#fff;transform:translateY(-2px)}
.btn-outline{border:2px solid #fff;color:#fff;padding:11px 30px;border-radius:4px;font-weight:700;font-size:1rem;transition:all .2s;display:inline-flex;align-items:center;gap:6px}
.btn-outline:hover{background:#fff;color:#111;transform:translateY(-2px)}

/* ---- 面包屑 ---- */
.breadcrumb{padding:12px 0;font-size:.88rem;color:#666;border-bottom:1px solid #222;margin-bottom:30px}
.breadcrumb a{color:#888}
.breadcrumb a:hover{color:#e8001d}
.breadcrumb span{color:#e8001d}

/* ---- 视频卡片网格 ---- */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.video-card{background:#1a1a1a;border-radius:8px;overflow:hidden;transition:transform .25s,box-shadow .25s;cursor:pointer;border:1px solid #222}
.video-card:hover{transform:translateY(-5px);box-shadow:0 12px 30px rgba(232,0,29,.2)}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:#111}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.06)}
.play-btn-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.35);opacity:0;transition:opacity .25s}
.video-card:hover .play-btn-overlay{opacity:1}
.play-circle{width:56px;height:56px;background:rgba(232,0,29,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 0 20px rgba(232,0,29,.5)}
.play-circle svg{width:22px;height:22px;fill:#fff;margin-left:4px}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;font-size:.75rem;padding:2px 7px;border-radius:3px}
.video-info{padding:14px}
.video-title{font-size:.95rem;font-weight:700;color:#eee;margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;font-size:.8rem;color:#666;flex-wrap:wrap}
.video-meta span{display:flex;align-items:center;gap:3px}
.video-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.video-tag{background:#222;color:#e8001d;font-size:.72rem;padding:2px 8px;border-radius:12px;border:1px solid #333}

/* ---- 统计数字 ---- */
.stats-bar{background:linear-gradient(90deg,#1a0005,#1a1a1a,#1a0005);border-top:1px solid #2a0008;border-bottom:1px solid #2a0008;padding:30px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-item h3{font-size:2.2rem;font-weight:900;color:#e8001d;letter-spacing:1px}
.stat-item p{font-size:.88rem;color:#888;margin-top:4px}

/* ---- 专家卡片 ---- */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:24px}
.expert-card{background:#1a1a1a;border-radius:10px;overflow:hidden;border:1px solid #222;text-align:center;transition:transform .25s,box-shadow .25s}
.expert-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(232,0,29,.15)}
.expert-avatar{width:100%;aspect-ratio:1;object-fit:cover;object-position:top}
.expert-info{padding:16px}
.expert-name{font-size:1.05rem;font-weight:800;color:#fff;margin-bottom:4px}
.expert-title{font-size:.82rem;color:#e8001d;margin-bottom:8px}
.expert-desc{font-size:.82rem;color:#888;line-height:1.5;margin-bottom:12px}
.expert-links{display:flex;gap:8px;justify-content:center}
.expert-links a{font-size:.78rem;padding:5px 12px;border-radius:20px;border:1px solid #333;color:#ccc;transition:all .2s}
.expert-links a:hover{background:#e8001d;border-color:#e8001d;color:#fff}

/* ---- 合作品牌Logo墙 ---- */
.partner-grid{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;align-items:center}
.partner-item{background:#1a1a1a;border:1px solid #222;border-radius:8px;padding:16px 28px;font-size:.95rem;font-weight:700;color:#888;transition:all .2s;min-width:120px;text-align:center}
.partner-item:hover{border-color:#e8001d;color:#e8001d}

/* ---- FAQ ---- */
.faq-list{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{background:#1a1a1a;border:1px solid #222;border-radius:8px;overflow:hidden}
.faq-q{padding:16px 20px;font-weight:700;color:#eee;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:.95rem;transition:background .2s}
.faq-q:hover{background:#222}
.faq-q.open{background:#1f0005;color:#e8001d}
.faq-q .faq-icon{font-size:1.2rem;transition:transform .3s;color:#e8001d;flex-shrink:0}
.faq-q.open .faq-icon{transform:rotate(45deg)}
.faq-a{padding:0 20px;max-height:0;overflow:hidden;transition:max-height .35s ease,padding .35s;color:#999;font-size:.9rem;line-height:1.7}
.faq-a.open{max-height:300px;padding:14px 20px}

/* ---- 用户评价 ---- */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:#1a1a1a;border:1px solid #222;border-radius:10px;padding:20px;transition:box-shadow .25s}
.review-card:hover{box-shadow:0 6px 20px rgba(232,0,29,.1)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#e8001d,#ff6b35);display:flex;align-items:center;justify-content:center;font-size:1.1rem;font-weight:800;color:#fff;flex-shrink:0}
.review-name{font-weight:700;color:#eee;font-size:.95rem}
.review-date{font-size:.78rem;color:#666}
.review-stars{color:#f5a623;font-size:.95rem;margin-bottom:8px}
.review-text{font-size:.88rem;color:#999;line-height:1.6}

/* ---- 联系我们 ---- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.contact-info h3{font-size:1.3rem;font-weight:800;color:#fff;margin-bottom:16px}
.contact-list{display:flex;flex-direction:column;gap:12px}
.contact-list li{display:flex;gap:10px;font-size:.9rem;color:#999}
.contact-list li strong{color:#e8001d;min-width:70px;flex-shrink:0}
.qrcode-row{display:flex;gap:20px;flex-wrap:wrap}
.qrcode-box{text-align:center}
.qrcode-box img{width:120px;height:120px;object-fit:contain;border-radius:8px;border:1px solid #222}
.qrcode-box p{font-size:.78rem;color:#888;margin-top:6px}

/* ---- 社交分享 ---- */
.social-share-bar{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.social-share-bar span{font-size:.88rem;color:#888}
.share-btn{padding:7px 16px;border-radius:20px;font-size:.82rem;font-weight:600;border:1px solid #333;color:#ccc;transition:all .2s;display:inline-flex;align-items:center;gap:5px}
.share-btn:hover{transform:translateY(-2px)}
.share-btn.wechat:hover{background:#07c160;border-color:#07c160;color:#fff}
.share-btn.weibo:hover{background:#e6162d;border-color:#e6162d;color:#fff}
.share-btn.douyin:hover{background:#000;border-color:#69c9d0;color:#69c9d0}
.share-btn.bilibili:hover{background:#00a1d6;border-color:#00a1d6;color:#fff}

/* ---- 底部 ---- */
.site-footer{background:#0d0d0d;border-top:2px solid #e8001d;padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand-logo{height:48px;margin-bottom:14px}
.footer-desc{font-size:.88rem;color:#666;line-height:1.7;margin-bottom:16px}
.footer-col h4{font-size:.95rem;font-weight:700;color:#fff;margin-bottom:14px;padding-bottom:8px;border-bottom:1px solid #222}
.footer-col ul li{margin-bottom:8px}
.footer-col ul li a{font-size:.85rem;color:#666;transition:color .2s}
.footer-col ul li a:hover{color:#e8001d}
.footer-bottom{background:#0a0a0a;border-top:1px solid #1a1a1a;padding:16px 0;text-align:center;font-size:.82rem;color:#555}
.footer-bottom a{color:#666}
.footer-bottom a:hover{color:#e8001d}
.footer-logo-wrap{display:flex;align-items:center;gap:10px}
.footer-favicon{width:28px;height:28px;object-fit:contain;border-radius:4px}

/* ---- 内页通用 ---- */
.page-hero{background:linear-gradient(135deg,#1a0005 0%,#111 60%,#1a1a1a 100%);padding:50px 0;border-bottom:2px solid #e8001d}
.page-hero h1{font-size:2.2rem;font-weight:900;color:#fff;margin-bottom:10px}
.page-hero h1 span{color:#e8001d}
.page-hero p{color:#888;font-size:1rem}
.detail-video-wrap{background:#000;border-radius:10px;overflow:hidden;margin-bottom:24px;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;border:1px solid #222}
.detail-video-wrap video{width:100%;height:100%;object-fit:contain}
.detail-video-placeholder{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;cursor:pointer;background:radial-gradient(circle at center,#1a0005 0%,#000 70%)}
.detail-video-placeholder .big-play{width:80px;height:80px;background:#e8001d;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform .2s,box-shadow .2s}
.detail-video-placeholder:hover .big-play{transform:scale(1.1);box-shadow:0 0 30px rgba(232,0,29,.6)}
.detail-video-placeholder .big-play svg{width:32px;height:32px;fill:#fff;margin-left:6px}
.detail-video-placeholder p{color:#888;font-size:.95rem}

/* ---- 标签页 ---- */
.tab-bar{display:flex;gap:4px;border-bottom:2px solid #222;margin-bottom:24px;flex-wrap:wrap}
.tab-btn{padding:10px 20px;font-size:.9rem;font-weight:600;color:#888;border-radius:4px 4px 0 0;transition:all .2s;cursor:pointer}
.tab-btn:hover{color:#e8001d}
.tab-btn.active{background:#e8001d;color:#fff}

/* ---- 侧边栏 ---- */
.sidebar-card{background:#1a1a1a;border:1px solid #222;border-radius:8px;padding:18px;margin-bottom:20px}
.sidebar-card h4{font-size:.95rem;font-weight:700;color:#fff;margin-bottom:14px;padding-bottom:8px;border-bottom:1px solid #222}
.sidebar-list li{padding:8px 0;border-bottom:1px solid #1f1f1f;font-size:.85rem;color:#888}
.sidebar-list li:last-child{border-bottom:none}
.sidebar-list li a{color:#888;transition:color .2s}
.sidebar-list li a:hover{color:#e8001d}

/* ---- 分页 ---- */
.pagination{display:flex;gap:8px;justify-content:center;padding:30px 0}
.page-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:4px;border:1px solid #222;color:#888;font-size:.88rem;transition:all .2s}
.page-btn:hover,.page-btn.active{background:#e8001d;border-color:#e8001d;color:#fff}

/* ---- 视频播放模态框 ---- */
.video-modal{display:none;position:fixed;inset:0;z-index:9999;background:rgba(0,0,0,.92);align-items:center;justify-content:center}
.video-modal.show{display:flex}
.modal-inner{position:relative;width:90%;max-width:900px;background:#000;border-radius:10px;overflow:hidden;border:1px solid #333}
.modal-close{position:absolute;top:10px;right:14px;font-size:1.8rem;color:#fff;cursor:pointer;z-index:10;line-height:1;opacity:.8;transition:opacity .2s}
.modal-close:hover{opacity:1;color:#e8001d}
.modal-video{width:100%;aspect-ratio:16/9;display:block}

/* ---- 修车配件网格 ---- */
.parts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px}
.part-card{background:#1a1a1a;border:1px solid #222;border-radius:8px;overflow:hidden;transition:transform .25s,box-shadow .25s}
.part-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(232,0,29,.15)}
.part-img{aspect-ratio:1;overflow:hidden}
.part-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.part-card:hover .part-img img{transform:scale(1.06)}
.part-info{padding:14px}
.part-name{font-size:.95rem;font-weight:700;color:#eee;margin-bottom:6px}
.part-price{color:#e8001d;font-size:1.05rem;font-weight:800}
.part-brand{font-size:.8rem;color:#666;margin-top:4px}

/* ---- AI功能卡片 ---- */
.ai-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.ai-card{background:linear-gradient(135deg,#1a0005 0%,#1a1a1a 100%);border:1px solid #2a0008;border-radius:10px;padding:28px;transition:transform .25s,box-shadow .25s}
.ai-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(232,0,29,.2)}
.ai-icon{font-size:2.5rem;margin-bottom:14px}
.ai-card h3{font-size:1.05rem;font-weight:800;color:#fff;margin-bottom:8px}
.ai-card p{font-size:.88rem;color:#888;line-height:1.6}

/* ---- 响应式 ---- */
@media(max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:68px;left:0;right:0;background:#111;border-bottom:2px solid #e8001d;padding:16px 0}
  .main-nav.open{display:block}
  .main-nav ul{flex-direction:column;gap:0;padding:0 20px}
  .main-nav ul li a{display:block;padding:12px 0;border-radius:0;border-bottom:1px solid #1a1a1a}
  .mobile-menu-toggle{display:flex}
  .site-header{position:relative}
  .hero-content h1{font-size:2rem}
  .hero-section{height:380px}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}
  .section-title{font-size:1.5rem}
}
@media(max-width:480px){
  .hero-content h1{font-size:1.6rem}
  .hero-btns{flex-direction:column;align-items:center}
  .stats-grid{grid-template-columns:1fr 1fr}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .video-grid{grid-template-columns:1fr 1fr}
}