/* ===== 困困兔汽车改装视频社区 - 全站样式 ===== */
/* 品牌色: 深红 #8B1A1A  辅助色: #1a1a2e #16213e #0f3460 #e94560 */

/* === 重置与基础 === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",Arial,sans-serif;color:#333;background:#f8f9fa;line-height:1.8;overflow-x:hidden}
a{color:#8B1A1A;text-decoration:none;transition:color .3s}
a:hover{color:#e94560}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:700;color:#1a1a2e;line-height:1.4}
h1{font-size:2.2rem}
h2{font-size:1.8rem}
h3{font-size:1.4rem}
h4{font-size:1.2rem}
h5{font-size:1.05rem}
h6{font-size:.95rem}

/* === 容器 === */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:60px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{display:inline-block;position:relative;padding-bottom:12px}
.section-title h2::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,#8B1A1A,#e94560);border-radius:2px}
.section-title p{color:#666;margin-top:10px;font-size:.95rem}

/* === 头部导航 === */
.site-header{background:#1a1a2e;position:sticky;top:0;z-index:1000;box-shadow:0 2px 10px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.site-logo{display:flex;align-items:center;gap:10px}
.site-logo img{height:45px;width:auto}
.site-logo span{color:#fff;font-size:1.3rem;font-weight:700}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{color:#ccc;padding:0 16px;height:70px;display:flex;align-items:center;font-size:.95rem;transition:all .3s;position:relative}
.main-nav a:hover,.main-nav a.active{color:#fff;background:rgba(233,69,96,.15)}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:3px;background:#e94560;transition:all .3s;transform:translateX(-50%)}
.main-nav a:hover::after,.main-nav a.active::after{width:80%}
.mobile-menu-btn{display:none;color:#fff;font-size:1.5rem;cursor:pointer;background:none;border:none}

/* === 搜索框 === */
.search-bar{background:#16213e;padding:12px 0}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;max-width:600px;width:100%}
.search-box input{flex:1;padding:10px 18px;border:2px solid #0f3460;border-right:none;border-radius:25px 0 0 25px;background:#1a1a2e;color:#fff;font-size:.95rem;outline:none;transition:border-color .3s}
.search-box input:focus{border-color:#e94560}
.search-box input::placeholder{color:#888}
.search-box button{padding:10px 25px;background:linear-gradient(135deg,#8B1A1A,#e94560);color:#fff;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:.95rem;transition:opacity .3s}
.search-box button:hover{opacity:.9}

/* === Hero区域 === */
.hero{background:linear-gradient(135deg,#1a1a2e 0%,#16213e 50%,#0f3460 100%);color:#fff;padding:80px 0;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:url('../images/car1.jpg') center/cover no-repeat;opacity:.15}
.hero .container{position:relative;z-index:2}
.hero-content{text-align:center;max-width:800px;margin:0 auto}
.hero h1{font-size:2.8rem;margin-bottom:15px;text-shadow:2px 2px 4px rgba(0,0,0,.5)}
.hero h1 .brand{color:#e94560}
.hero .subtitle{font-size:1.2rem;color:#ccc;margin-bottom:30px}
.hero .hero-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:30px}
.hero .hero-tags span{background:rgba(233,69,96,.2);border:1px solid rgba(233,69,96,.4);padding:6px 18px;border-radius:20px;font-size:.85rem;color:#e94560}
.hero-btns{display:flex;justify-content:center;gap:15px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:25px;font-size:1rem;font-weight:600;transition:all .3s;cursor:pointer;border:none}
.btn-primary{background:linear-gradient(135deg,#8B1A1A,#e94560);color:#fff;box-shadow:0 4px 15px rgba(233,69,96,.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(233,69,96,.5);color:#fff}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.5)}
.btn-outline:hover{background:rgba(255,255,255,.1);border-color:#fff;color:#fff}

/* === 视频卡片 === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,.08);transition:all .3s;position:relative}
.video-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,.15)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#1a1a2e}
.video-thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.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(233,69,96,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;cursor:pointer}
.video-card:hover .video-play-btn{opacity:1}
.video-play-btn::after{content:'';border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.8rem}
.video-info{padding:15px}
.video-info h4{font-size:1rem;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;align-items:center;gap:15px;color:#999;font-size:.85rem}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.video-tags span{background:#f0f0f0;color:#666;padding:2px 10px;border-radius:12px;font-size:.75rem}

/* === 模块卡片 === */
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:25px}
.module-card{background:#fff;border-radius:12px;padding:30px 25px;text-align:center;box-shadow:0 4px 15px rgba(0,0,0,.06);transition:all .3s;border:1px solid #eee}
.module-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,.12);border-color:#e94560}
.module-icon{width:70px;height:70px;margin:0 auto 15px;background:linear-gradient(135deg,#8B1A1A,#e94560);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.8rem;color:#fff}
.module-card h4{margin-bottom:10px}
.module-card p{color:#666;font-size:.9rem;line-height:1.6}

/* === 专家展示 === */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,.08);transition:all .3s}
.expert-card:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(0,0,0,.12)}
.expert-avatar{width:100%;height:200px;background:linear-gradient(135deg,#1a1a2e,#0f3460);display:flex;align-items:center;justify-content:center;font-size:4rem;color:#e94560}
.expert-info{padding:20px}
.expert-info h4{margin-bottom:5px}
.expert-info .role{color:#e94560;font-size:.85rem;margin-bottom:10px}
.expert-info p{color:#666;font-size:.9rem;margin-bottom:12px}
.expert-info .expert-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.expert-info .expert-tags span{background:#f5f5f5;color:#666;padding:3px 10px;border-radius:12px;font-size:.75rem}
.expert-btns{display:flex;gap:10px}
.expert-btns a{flex:1;text-align:center;padding:8px;border-radius:6px;font-size:.85rem;transition:all .3s}
.expert-btns .btn-contact{background:#8B1A1A;color:#fff}
.expert-btns .btn-contact:hover{background:#e94560;color:#fff}
.expert-btns .btn-works{background:#f5f5f5;color:#333}
.expert-btns .btn-works:hover{background:#eee}

/* === 品牌墙 === */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.brand-wall .brand-item{background:#fff;padding:20px 30px;border-radius:10px;box-shadow:0 2px 10px rgba(0,0,0,.06);font-size:1.1rem;font-weight:700;color:#555;transition:all .3s;border:1px solid #eee}
.brand-wall .brand-item:hover{border-color:#e94560;color:#8B1A1A;transform:scale(1.05)}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;box-shadow:0 2px 8px rgba(0,0,0,.05);overflow:hidden;border:1px solid #eee}
.faq-question{padding:18px 25px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;transition:background .3s}
.faq-question:hover{background:#f9f9f9}
.faq-question .arrow{transition:transform .3s;font-size:1.2rem;color:#999}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 25px;max-height:0;overflow:hidden;transition:all .3s;color:#666;line-height:1.8}
.faq-item.active .faq-answer{padding:0 25px 18px;max-height:500px}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px}
.review-card{background:#fff;border-radius:12px;padding:25px;box-shadow:0 4px 15px rgba(0,0,0,.06);border:1px solid #eee;transition:all .3s}
.review-card:hover{box-shadow:0 6px 20px rgba(0,0,0,.1)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#8B1A1A,#e94560);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem}
.review-user h5{margin-bottom:2px}
.review-user .date{color:#999;font-size:.8rem}
.review-stars{color:#f5a623;margin-bottom:8px;font-size:.9rem}
.review-text{color:#555;font-size:.9rem;line-height:1.7}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:25px}
.contact-card{background:#fff;border-radius:12px;padding:25px;text-align:center;box-shadow:0 4px 15px rgba(0,0,0,.06);border:1px solid #eee}
.contact-card .icon{font-size:2.5rem;margin-bottom:10px}
.contact-card h5{margin-bottom:8px}
.contact-card p{color:#666;font-size:.9rem}

/* === 社交分享 === */
.share-bar{display:flex;justify-content:center;gap:15px;flex-wrap:wrap;padding:20px 0}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 20px;border-radius:20px;font-size:.85rem;color:#fff;transition:all .3s}
.share-btn:hover{transform:translateY(-2px);color:#fff}
.share-wechat{background:#07c160}
.share-weibo{background:#e6162d}
.share-douyin{background:#161823}
.share-bilibili{background:#00a1d6}

/* === 页脚 === */
.site-footer{background:#1a1a2e;color:#ccc;padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:40px}
.footer-col h5{color:#fff;margin-bottom:15px;font-size:1.05rem}
.footer-col p,.footer-col a{color:#999;font-size:.9rem;line-height:2}
.footer-col a:hover{color:#e94560}
.footer-col .qrcode{width:120px;border-radius:8px;margin-top:10px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;text-align:center;font-size:.85rem;color:#666}
.footer-bottom a{color:#888}
.footer-bottom a:hover{color:#e94560}

/* === 面包屑 === */
.breadcrumb{padding:15px 0;font-size:.9rem;color:#999}
.breadcrumb a{color:#666}
.breadcrumb a:hover{color:#e94560}
.breadcrumb span{margin:0 8px;color:#ccc}

/* === 内页通用 === */
.page-hero{background:linear-gradient(135deg,#1a1a2e,#0f3460);color:#fff;padding:50px 0;text-align:center}
.page-hero h1{font-size:2.2rem;margin-bottom:10px}
.page-hero p{color:#ccc;font-size:1rem}
.page-content{padding:40px 0}
.content-section{margin-bottom:50px}
.content-section h2{margin-bottom:20px;padding-bottom:10px;border-bottom:2px solid #eee}
.content-section h3{margin-bottom:15px;color:#8B1A1A}
.article-text{color:#555;line-height:2;font-size:.95rem}
.article-text p{margin-bottom:15px}

/* === How-To指南 === */
.howto-steps{counter-reset:step}
.howto-step{display:flex;gap:20px;margin-bottom:25px;align-items:flex-start}
.howto-step::before{counter-increment:step;content:counter(step);flex-shrink:0;width:45px;height:45px;background:linear-gradient(135deg,#8B1A1A,#e94560);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.2rem}
.howto-step-content h4{margin-bottom:5px}
.howto-step-content p{color:#666;font-size:.9rem}

/* === 干扰标签隐藏 === */
.noise-wrap{position:absolute;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none;z-index:-9999}

/* === 响应式 === */
@media(max-width:768px){
  .header-inner{padding:0 15px}
  .main-nav{display:none;position:absolute;top:70px;left:0;right:0;background:#1a1a2e;flex-direction:column;padding:10px 0;box-shadow:0 5px 15px rgba(0,0,0,.3)}
  .main-nav.show{display:flex}
  .main-nav a{height:auto;padding:12px 20px;width:100%}
  .mobile-menu-btn{display:block}
  .hero h1{font-size:1.8rem}
  .hero .subtitle{font-size:1rem}
  .section{padding:40px 0}
  .video-grid{grid-template-columns:1fr}
  .module-grid{grid-template-columns:1fr 1fr}
  .expert-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  h1{font-size:1.6rem}
  h2{font-size:1.4rem}
}
@media(max-width:480px){
  .module-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-btns{flex-direction:column;align-items:center}
  .search-box{margin:0 10px}
}

/* === 懒加载 === */
img[data-src]{opacity:0;transition:opacity .5s}
img.loaded{opacity:1}

/* === 动画 === */
.fade-in{opacity:0;transform:translateY(20px);transition:all .6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* === 社区模块 === */
.community-cats{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:15px}
.community-cat{background:#fff;border-radius:10px;padding:20px;text-align:center;box-shadow:0 2px 10px rgba(0,0,0,.06);transition:all .3s;border:2px solid transparent}
.community-cat:hover{border-color:#e94560;transform:translateY(-3px)}
.community-cat .cat-icon{font-size:2rem;margin-bottom:8px}
.community-cat h5{margin-bottom:4px}
.community-cat p{color:#999;font-size:.8rem}

/* === MCP前端代码区 === */
.mcp-section{background:#16213e;color:#ccc;padding:30px 0}
.mcp-section .container{text-align:center}
.mcp-section code{background:rgba(0,0,0,.3);padding:15px 25px;border-radius:8px;display:inline-block;font-family:monospace;font-size:.85rem;color:#e94560}