/* ============================================
   妻社 修车改装视频社区 - 原创样式表
   品牌色系：深碳灰 #1a1a2e | 赛车红 #e63946 | 钛金银 #a8b2c1 | 深蓝 #16213e
   ============================================ */

/* === 基础重置 === */
*,*::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:#e0e0e0;background:#0d0d1a;line-height:1.8;overflow-x:hidden}
a{color:#e63946;text-decoration:none;transition:color .3s}
a:hover{color:#ff6b6b}
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:#fff}

/* === 容器 === */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:60px 0}
.section-dark{background:#0d0d1a}
.section-alt{background:#111128}
.section-gradient{background:linear-gradient(135deg,#1a1a2e 0%,#16213e 100%)}

/* === 头部导航 === */
.site-header{background:rgba(13,13,26,.97);position:sticky;top:0;z-index:1000;border-bottom:1px solid rgba(230,57,70,.3);backdrop-filter:blur(12px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:1200px;margin:0 auto}
.logo-link{display:flex;align-items:center;gap:10px}
.logo-link img{height:48px;width:auto}
.logo-text{font-size:1.5rem;font-weight:800;color:#fff;letter-spacing:2px}
.logo-text span{color:#e63946}

/* 导航菜单 */
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{color:#c0c0d0;padding:10px 16px;font-size:.95rem;font-weight:500;transition:all .3s;position:relative}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:2px;background:#e63946;transition:all .3s;transform:translateX(-50%)}
.main-nav a:hover,.main-nav a.active{color:#fff}
.main-nav a:hover::after,.main-nav a.active::after{width:70%}

/* 移动端菜单按钮 */
.menu-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer;padding:8px}

/* === 搜索框 === */
.search-bar{background:#16213e;padding:12px 0;border-bottom:1px solid rgba(168,178,193,.15)}
.search-bar .container{display:flex;justify-content:center}
.search-form{display:flex;max-width:600px;width:100%;position:relative}
.search-form input{flex:1;padding:10px 18px;border:2px solid rgba(230,57,70,.4);border-right:none;border-radius:25px 0 0 25px;background:rgba(26,26,46,.8);color:#fff;font-size:.95rem;outline:none;transition:border-color .3s}
.search-form input:focus{border-color:#e63946}
.search-form input::placeholder{color:#666}
.search-form button{padding:10px 24px;background:#e63946;color:#fff;border:2px solid #e63946;border-radius:0 25px 25px 0;cursor:pointer;font-size:.95rem;font-weight:600;transition:background .3s}
.search-form button:hover{background:#c1121f}

/* === Banner 横幅 === */
.hero-banner{position:relative;height:520px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.hero-banner .banner-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.55)}
.hero-banner .banner-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,13,26,.3) 0%,rgba(13,13,26,.85) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;max-width:800px;padding:0 20px}
.hero-content h1{font-size:2.8rem;margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.hero-content h1 span{color:#e63946}
.hero-content p{font-size:1.15rem;color:#c0c0d0;margin-bottom:24px;line-height:1.8}
.hero-content .hero-tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:16px}
.hero-content .hero-tags span{background:rgba(230,57,70,.15);border:1px solid rgba(230,57,70,.4);color:#ff6b6b;padding:6px 16px;border-radius:20px;font-size:.85rem}

/* === 通用标题 === */
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:3px;background:#e63946;margin:12px auto 0}
.section-title p{color:#888;font-size:1rem;margin-top:8px}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:#16213e;border-radius:12px;overflow:hidden;transition:transform .3s,box-shadow .3s;cursor:pointer;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(230,57,70,.2)}
.video-card .thumb{position:relative;padding-top:56.25%;overflow:hidden}
.video-card .thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .thumb img{transform:scale(1.08)}
.video-card .play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:60px;height:60px;background:rgba(230,57,70,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform .3s;z-index:3}
.video-card .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 .play-btn{transform:translate(-50%,-50%) scale(1)}
.video-card .card-body{padding:16px}
.video-card .card-body h3{font-size:1rem;margin-bottom:8px;color:#fff;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-meta{display:flex;justify-content:space-between;color:#777;font-size:.8rem}
.video-card .card-meta .views::before{content:'▶ '}
.video-card .card-meta .likes::before{content:'♥ '}
.video-card .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-card .tag{position:absolute;top:10px;left:10px;background:#e63946;color:#fff;padding:3px 10px;border-radius:4px;font-size:.75rem;font-weight:600;z-index:2}

/* === 专家团队 === */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:30px}
.expert-card{background:#16213e;border-radius:12px;padding:30px 20px;text-align:center;transition:transform .3s,box-shadow .3s}
.expert-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px rgba(230,57,70,.15)}
.expert-card .avatar{width:120px;height:120px;border-radius:50%;margin:0 auto 16px;overflow:hidden;border:3px solid #e63946}
.expert-card .avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h4{font-size:1.1rem;margin-bottom:6px}
.expert-card .role{color:#e63946;font-size:.85rem;margin-bottom:12px}
.expert-card p{color:#888;font-size:.85rem;line-height:1.6;margin-bottom:16px}
.expert-card .expert-links{display:flex;gap:10px;justify-content:center}
.expert-card .expert-links a{padding:6px 14px;border:1px solid #e63946;border-radius:20px;color:#e63946;font-size:.8rem;transition:all .3s}
.expert-card .expert-links a:hover{background:#e63946;color:#fff}

/* === FAQ 手风琴 === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#16213e;border-radius:8px;margin-bottom:12px;overflow:hidden;border:1px solid rgba(168,178,193,.1)}
.faq-item .faq-q{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#fff;transition:background .3s}
.faq-item .faq-q:hover{background:rgba(230,57,70,.1)}
.faq-item .faq-q .icon{color:#e63946;font-size:1.2rem;transition:transform .3s}
.faq-item.active .faq-q .icon{transform:rotate(45deg)}
.faq-item .faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px}
.faq-item.active .faq-a{max-height:300px;padding:0 24px 18px}
.faq-item .faq-a p{color:#999;font-size:.9rem;line-height:1.8}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.review-card{background:#16213e;border-radius:12px;padding:24px;position:relative}
.review-card .stars{color:#f0a500;font-size:1rem;margin-bottom:10px;letter-spacing:2px}
.review-card .review-text{color:#bbb;font-size:.9rem;line-height:1.7;margin-bottom:16px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer .r-avatar{width:40px;height:40px;border-radius:50%;background:#e63946;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.9rem}
.review-card .reviewer .r-info .r-name{font-size:.9rem;color:#fff;font-weight:600}
.review-card .reviewer .r-info .r-date{font-size:.75rem;color:#666}
.review-card::before{content:'"';position:absolute;top:10px;right:20px;font-size:4rem;color:rgba(230,57,70,.15);font-family:Georgia,serif;line-height:1}

/* === 合作品牌 === */
.brand-wall{display:flex;flex-wrap:wrap;gap:30px;justify-content:center;align-items:center}
.brand-wall .brand-item{background:rgba(22,33,62,.6);padding:20px 30px;border-radius:8px;border:1px solid rgba(168,178,193,.1);font-size:1.1rem;color:#a8b2c1;font-weight:700;letter-spacing:2px;transition:all .3s}
.brand-wall .brand-item:hover{border-color:#e63946;color:#fff;transform:scale(1.05)}

/* === How-To 指南 === */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:24px;counter-reset:step}
.howto-step{background:#16213e;border-radius:12px;padding:30px 20px;text-align:center;position:relative;counter-increment:step}
.howto-step::before{content:counter(step);position:absolute;top:-15px;left:50%;transform:translateX(-50%);width:36px;height:36px;background:#e63946;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem}
.howto-step h4{margin-top:10px;margin-bottom:10px;font-size:1rem}
.howto-step p{color:#888;font-size:.85rem}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:30px}
.contact-card{background:#16213e;border-radius:12px;padding:30px;text-align:center}
.contact-card h4{margin-bottom:16px;font-size:1.1rem}
.contact-card p{color:#999;font-size:.9rem;line-height:1.8;margin-bottom:8px}
.contact-card .qr-img{width:160px;height:160px;margin:16px auto;border-radius:8px;overflow:hidden;border:2px solid rgba(230,57,70,.3)}
.contact-card .qr-img img{width:100%;height:100%;object-fit:cover}

/* === 社交分享 === */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.share-bar a{display:flex;align-items:center;gap:6px;padding:8px 18px;border-radius:25px;font-size:.85rem;font-weight:600;color:#fff;transition:all .3s}
.share-bar a.wechat{background:#07c160}
.share-bar a.weibo{background:#e6162d}
.share-bar a.douyin{background:#161823}
.share-bar a.bilibili{background:#00a1d6}
.share-bar a:hover{transform:translateY(-2px);filter:brightness(1.15)}

/* === 页脚 === */
.site-footer{background:#0a0a18;border-top:1px solid rgba(230,57,70,.2);padding:40px 0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:30px;margin-bottom:30px}
.footer-col h5{color:#fff;font-size:1rem;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-col h5::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:#e63946}
.footer-col p,.footer-col a{color:#777;font-size:.85rem;line-height:2}
.footer-col a:hover{color:#e63946}
.footer-col .footer-logo{height:40px;margin-bottom:12px}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,.05);color:#555;font-size:.8rem}
.footer-bottom a{color:#777}

/* === 面包屑 === */
.breadcrumb{padding:8px 0;font-size:.82rem;color:#666;background:#0a0a18;border-bottom:1px solid rgba(255,255,255,.03)}
.breadcrumb a{color:#999}
.breadcrumb a:hover{color:#e63946}
.breadcrumb span{margin:0 8px;color:#444}
.breadcrumb strong{color:#e63946;font-weight:600}

/* === 内页通用 === */
.page-hero{background:linear-gradient(135deg,#1a1a2e,#16213e);padding:60px 0 40px;text-align:center}
.page-hero h1{font-size:2.2rem;margin-bottom:10px}
.page-hero p{color:#888;font-size:1rem}

/* === AI赋能模块 === */
.ai-features{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.ai-card{background:linear-gradient(145deg,#16213e,#1a1a2e);border-radius:12px;padding:30px;border:1px solid rgba(230,57,70,.15);transition:all .3s}
.ai-card:hover{border-color:#e63946;box-shadow:0 0 30px rgba(230,57,70,.1)}
.ai-card .ai-icon{font-size:2.5rem;margin-bottom:16px}
.ai-card h4{font-size:1.1rem;margin-bottom:10px}
.ai-card p{color:#888;font-size:.85rem;line-height:1.7}

/* === 数据统计 === */
.stats-bar{display:flex;justify-content:center;gap:40px;flex-wrap:wrap;padding:30px 0}
.stat-item{text-align:center}
.stat-item .stat-num{font-size:2.2rem;font-weight:800;color:#e63946}
.stat-item .stat-label{font-size:.85rem;color:#888;margin-top:4px}

/* === 分类标签 === */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.tag-cloud a{background:rgba(230,57,70,.1);border:1px solid rgba(230,57,70,.3);color:#ff6b6b;padding:6px 16px;border-radius:20px;font-size:.82rem;transition:all .3s}
.tag-cloud a:hover{background:#e63946;color:#fff;border-color:#e63946}

/* === MCP前端代码区 === */
.mcp-widget{background:#111128;border:1px solid rgba(168,178,193,.1);border-radius:8px;padding:20px;margin-top:20px}
.mcp-widget pre{color:#a8b2c1;font-size:.8rem;overflow-x:auto;font-family:"Fira Code",monospace}

/* === 按钮 === */
.btn{display:inline-block;padding:10px 28px;border-radius:25px;font-weight:600;font-size:.9rem;transition:all .3s;cursor:pointer;border:none}
.btn-primary{background:#e63946;color:#fff}
.btn-primary:hover{background:#c1121f;transform:translateY(-2px)}
.btn-outline{background:transparent;border:2px solid #e63946;color:#e63946}
.btn-outline:hover{background:#e63946;color:#fff}

/* === 动画效果 === */
.anim-fade{opacity:0;transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}
.anim-fade[style*="opacity: 1"]{transform:translateY(0)}

/* === 响应式 === */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .menu-toggle{display:block}
  .main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}
  .main-nav.open{display:flex}
  .main-nav a{padding:12px 0;border-bottom:1px solid rgba(255,255,255,.05)}
  .hero-banner{height:400px}
  .hero-content h1{font-size:1.8rem}
  .hero-content p{font-size:.95rem}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
  .expert-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .stats-bar{gap:20px}
  .stat-item .stat-num{font-size:1.6rem}
  .section{padding:40px 0}
  .section-title h2{font-size:1.5rem}
  .search-form{max-width:100%}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .footer-grid{grid-template-columns:1fr}
  .video-grid{grid-template-columns:1fr}
  .hero-banner{height:320px}
  .hero-content h1{font-size:1.5rem}
  .brand-wall .brand-item{padding:12px 18px;font-size:.9rem}
}

/* === 视频播放器弹窗 === */
.video-overlay{position:fixed;inset:0;background:rgba(0,0,0,.92);z-index:9999;display:flex;align-items:center;justify-content:center;cursor:pointer}
.video-player-mock{background:#16213e;border-radius:16px;padding:50px 40px;text-align:center;max-width:560px;width:90%;position:relative;cursor:default}
.video-player-mock .close-btn{position:absolute;top:12px;right:18px;font-size:2rem;color:#999;cursor:pointer;transition:color .3s;line-height:1}
.video-player-mock .close-btn:hover{color:#e63946}
.video-player-mock .player-icon{font-size:4rem;color:#e63946;margin-bottom:16px}
.video-player-mock h3{font-size:1.1rem;color:#fff;margin-bottom:10px}
.video-player-mock p{color:#999;font-size:.9rem}
.progress-bar{width:100%;height:4px;background:rgba(255,255,255,.1);border-radius:2px;margin-top:20px;overflow:hidden}
.progress-fill{width:0;height:100%;background:#e63946;border-radius:2px;transition:width 2s ease}

/* === 返回顶部 === */
.back-to-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:#e63946;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;cursor:pointer;opacity:0;visibility:hidden;transition:all .3s;z-index:999;box-shadow:0 4px 15px rgba(230,57,70,.4)}
.back-to-top.show{opacity:1;visibility:visible}
.back-to-top:hover{background:#c1121f;transform:translateY(-3px)}

/* === 滚动动画 === */
.anim-fade{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.anim-fade.visible{opacity:1;transform:translateY(0)}

/* === FAQ open状态 === */
.faq-item.open .faq-q .icon{transform:rotate(45deg)}
.faq-item.open .faq-a{max-height:300px;padding:0 24px 18px}