/* 陈美娇修车改装视频社区 - 原创样式表 */
:root{--primary:#c8102e;--primary-dark:#a00d24;--secondary:#1a2332;--accent:#f5a623;--dark:#0b1120;--grey-900:#1c2333;--grey-700:#3a4556;--grey-500:#6b7a8d;--grey-300:#b0bec5;--grey-100:#eceff1;--white:#ffffff;--radius:10px;--shadow:0 4px 20px rgba(11,17,32,.12);--font:'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Helvetica Neue',sans-serif}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--grey-900);line-height:1.7;background:var(--grey-100)}
a{color:inherit;text-decoration:none;transition:color .3s}
img{max-width:100%;height:auto;display:block}
.container{max-width:1240px;margin:0 auto;padding:0 20px}

/* 头部导航 */
.site-header{background:var(--secondary);position:sticky;top:0;z-index:1000;box-shadow:0 2px 12px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:42px;width:auto}
.logo-wrap span{font-size:1.4rem;font-weight:700;color:var(--white);letter-spacing:1px}
.main-nav{display:flex;gap:4px}
.main-nav a{color:var(--grey-300);padding:8px 14px;border-radius:6px;font-size:.9rem;transition:all .3s}
.main-nav a:hover,.main-nav a.active{color:var(--white);background:rgba(200,16,46,.2)}
.nav-toggle{display:none;background:none;border:none;color:var(--white);font-size:1.5rem;cursor:pointer}

/* 搜索栏 */
.search-bar{background:var(--dark);padding:14px 0;border-bottom:1px solid rgba(255,255,255,.06)}
.search-wrap{display:flex;max-width:680px;margin:0 auto}
.search-wrap input{flex:1;padding:10px 18px;border:2px solid var(--grey-700);border-right:none;border-radius:8px 0 0 8px;background:var(--grey-900);color:var(--white);font-size:.95rem;outline:none;transition:border-color .3s}
.search-wrap input:focus{border-color:var(--primary)}
.search-wrap input::placeholder{color:var(--grey-500)}
.search-wrap button{padding:10px 28px;background:var(--primary);color:var(--white);border:none;border-radius:0 8px 8px 0;font-size:.95rem;cursor:pointer;transition:background .3s}
.search-wrap button:hover{background:var(--primary-dark)}

/* Banner */
.hero-banner{position:relative;height:520px;overflow:hidden;background:var(--dark)}
.hero-banner img{width:100%;height:100%;object-fit:cover;opacity:.55}
.hero-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:0 20px}
.hero-overlay h1{font-size:2.8rem;color:var(--white);margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,.6)}
.hero-overlay p{font-size:1.15rem;color:var(--grey-300);max-width:700px;line-height:1.8;margin-bottom:24px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.btn-primary{display:inline-block;padding:12px 32px;background:var(--primary);color:var(--white);border-radius:8px;font-weight:600;transition:all .3s;border:none;cursor:pointer;font-size:1rem}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 6px 20px rgba(200,16,46,.4)}
.btn-outline{display:inline-block;padding:12px 32px;border:2px solid var(--white);color:var(--white);border-radius:8px;font-weight:600;transition:all .3s}
.btn-outline:hover{background:var(--white);color:var(--dark)}

/* 通用区块 */
.section{padding:64px 0}
.section-alt{background:var(--white)}
.section-dark{background:var(--secondary);color:var(--white)}
.section-head{text-align:center;margin-bottom:44px}
.section-head h2{font-size:2rem;color:var(--secondary);display:inline-block;position:relative;padding-bottom:14px}
.section-dark .section-head h2{color:var(--white)}
.section-head h2::after{content:"";position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:56px;height:4px;background:var(--primary);border-radius:2px}
.section-head p{color:var(--grey-500);margin-top:10px;font-size:1rem}
.section-dark .section-head p{color:var(--grey-300)}

/* 视频网格 */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.video-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.video-card:hover{transform:translateY(-6px);box-shadow:0 10px 36px rgba(11,17,32,.18)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;cursor:pointer}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.06)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;background:rgba(200,16,46,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;z-index:3}
.video-card:hover .play-btn{opacity:1}
.play-btn::after{content:"";border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent var(--white);margin-left:3px}
.video-info{padding:14px 16px}
.video-info h3{font-size:.95rem;margin-bottom:6px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;color:var(--grey-500);font-size:.8rem}
.video-tag{display:inline-block;padding:2px 8px;background:rgba(200,16,46,.1);color:var(--primary);border-radius:4px;font-size:.75rem;margin-top:6px}

/* 短视频网格 */
.short-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.short-card{position:relative;border-radius:var(--radius);overflow:hidden;padding-top:150%;cursor:pointer}
.short-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.short-card:hover img{transform:scale(1.06)}
.short-overlay{position:absolute;bottom:0;left:0;right:0;padding:14px;background:linear-gradient(transparent,rgba(0,0,0,.8));color:var(--white);z-index:2}
.short-overlay h4{font-size:.88rem;margin-bottom:3px}
.short-overlay span{font-size:.75rem;opacity:.8}
.short-card .play-btn{width:44px;height:44px}
.short-card:hover .play-btn{opacity:1}

/* AI赋能 */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:var(--white);border-radius:var(--radius);padding:32px 24px;text-align:center;box-shadow:var(--shadow);transition:transform .3s}
.ai-card:hover{transform:translateY(-4px)}
.ai-icon{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;color:var(--white)}
.ai-card h3{font-size:1.1rem;margin-bottom:10px;color:var(--secondary)}
.ai-card p{color:var(--grey-500);font-size:.9rem;line-height:1.6}

/* 专家展示 */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);text-align:center;transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-avatar{width:100%;aspect-ratio:1;overflow:hidden}
.expert-avatar img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.expert-card:hover .expert-avatar img{transform:scale(1.05)}
.expert-body{padding:18px 16px}
.expert-body h3{font-size:1.05rem;margin-bottom:4px;color:var(--secondary)}
.expert-body .role{color:var(--primary);font-size:.85rem;margin-bottom:8px}
.expert-body p{color:var(--grey-500);font-size:.82rem;line-height:1.5;margin-bottom:12px}
.expert-links{display:flex;gap:8px;justify-content:center}
.expert-links a{padding:6px 14px;border-radius:6px;font-size:.8rem;transition:all .3s}
.expert-links .link-contact{background:var(--primary);color:var(--white)}
.expert-links .link-contact:hover{background:var(--primary-dark)}
.expert-links .link-work{border:1px solid var(--grey-300);color:var(--grey-700)}
.expert-links .link-work:hover{border-color:var(--primary);color:var(--primary)}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--white);border-radius:var(--radius);margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-q{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .3s}
.faq-q:hover{background:var(--grey-100)}
.faq-q::after{content:"+";font-size:1.4rem;color:var(--primary);transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .3s;color:var(--grey-500);line-height:1.7}
.faq-item.open .faq-a{padding:0 24px 18px;max-height:400px}

/* 用户评论 */
.review-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.review-card{background:var(--white);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.review-stars{color:var(--accent);margin-bottom:10px;font-size:1rem}
.review-card p{color:var(--grey-700);font-size:.9rem;line-height:1.6;margin-bottom:12px;font-style:italic}
.review-author{font-weight:600;color:var(--secondary);font-size:.85rem}

/* How-To */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:step}
.howto-step{background:var(--white);border-radius:var(--radius);padding:28px 20px;text-align:center;box-shadow:var(--shadow);position:relative;counter-increment:step}
.howto-step::before{content:counter(step);width:44px;height:44px;background:var(--primary);color:var(--white);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:700;margin:0 auto 14px}
.howto-step h3{font-size:1rem;margin-bottom:8px;color:var(--secondary)}
.howto-step p{color:var(--grey-500);font-size:.85rem;line-height:1.5}

/* 品牌墙 */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:32px;align-items:center}
.brand-wall span{font-size:1.1rem;color:var(--grey-500);font-weight:600;padding:12px 24px;border:1px solid var(--grey-300);border-radius:8px;transition:all .3s}
.brand-wall span:hover{border-color:var(--primary);color:var(--primary)}

/* 社交分享 */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:8px;color:var(--white);font-size:.9rem;transition:transform .3s}
.share-btn:hover{transform:translateY(-2px)}
.share-wechat{background:#07c160}
.share-weibo{background:#e6162d}
.share-douyin{background:#161823}
.share-bilibili{background:#00a1d6}

/* 页脚 */
.site-footer{background:var(--dark);color:var(--grey-300);padding:48px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-brand img{height:36px;margin-bottom:12px}
.footer-brand p{font-size:.85rem;line-height:1.6;color:var(--grey-500)}
.footer-col h4{color:var(--white);font-size:.95rem;margin-bottom:14px;position:relative;padding-bottom:8px}
.footer-col h4::after{content:"";position:absolute;bottom:0;left:0;width:30px;height:2px;background:var(--primary)}
.footer-col a{display:block;color:var(--grey-500);font-size:.85rem;padding:3px 0;transition:color .3s}
.footer-col a:hover{color:var(--primary)}
.footer-qr{display:flex;gap:20px;margin-top:16px}
.footer-qr figure{text-align:center}
.footer-qr img{width:100px;height:100px;border-radius:6px;border:2px solid rgba(255,255,255,.1)}
.footer-qr figcaption{font-size:.75rem;color:var(--grey-500);margin-top:4px}
.footer-bottom{text-align:center;padding:20px 0;font-size:.82rem;color:var(--grey-500)}
.footer-bottom a{color:var(--grey-300)}

/* 面包屑 */
.breadcrumb{padding:14px 0;font-size:.85rem;color:var(--grey-500)}
.breadcrumb a{color:var(--primary)}
.breadcrumb span{margin:0 6px}

/* 内页通用 */
.page-hero{background:var(--secondary);padding:48px 0;text-align:center}
.page-hero h1{color:var(--white);font-size:2rem;margin-bottom:8px}
.page-hero p{color:var(--grey-300);font-size:1rem}
.page-content{padding:48px 0}
.page-content h2{font-size:1.6rem;color:var(--secondary);margin-bottom:16px}
.page-content h3{font-size:1.2rem;color:var(--secondary);margin-bottom:12px}
.page-content p{color:var(--grey-700);line-height:1.8;margin-bottom:16px}

/* 动画 */
.fade-up{opacity:0;transform:translateY(24px);transition:all .6s ease-out}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* 响应式 */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(3,1fr)}
  .short-grid{grid-template-columns:repeat(3,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .ai-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}
  .main-nav.open{display:flex}
  .nav-toggle{display:block}
  .hero-banner{height:380px}
  .hero-overlay h1{font-size:1.8rem}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .short-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .section{padding:40px 0}
  .section-head h2{font-size:1.5rem}
  .footer-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .short-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .ai-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .hero-banner{height:300px}
  .hero-overlay h1{font-size:1.4rem}
}

/* noscript回退 */
noscript .fade-up{opacity:1!important;transform:none!important}