/* ============================================
   爆料吃瓜网 - 汽车改装与视频社区 原创样式
   配色：赛车红 #D4213D / 碳纤维黑 #1A1A2E / 钛银 #C0C0C8 / 深灰 #2D2D3F / 暖白 #F5F5F0
   ============================================ */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:#2D2D3F;background:#F5F5F0;line-height:1.75}
a{color:#D4213D;text-decoration:none;transition:color .3s}
a:hover{color:#A8182F}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* 干扰标签容器 - 隐藏不影响布局 */
.kkt-noise{position:absolute;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none;z-index:-9999}

/* 导航栏 */
.site-header{background:linear-gradient(135deg,#1A1A2E 0%,#2D2D3F 100%);position:sticky;top:0;z-index:1000;box-shadow:0 2px 20px rgba(0,0,0,.4)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;padding:0 20px;max-width:1200px;margin:0 auto;height:68px}
.nav-logo{display:flex;align-items:center;gap:10px}
.nav-logo img{height:42px;width:auto}
.nav-logo span{color:#fff;font-size:1.3rem;font-weight:700;letter-spacing:1px}
.nav-menu{display:flex;list-style:none;gap:0}
.nav-menu li a{color:#C0C0C8;padding:22px 18px;display:block;font-size:.95rem;transition:all .3s;border-bottom:3px solid transparent}
.nav-menu li a:hover,.nav-menu li a.active{color:#fff;border-bottom-color:#D4213D;background:rgba(212,33,61,.1)}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:10px}
.nav-toggle span{width:26px;height:3px;background:#fff;border-radius:2px;transition:.3s}

/* 搜索框 */
.search-bar{background:#2D2D3F;padding:12px 0;border-bottom:1px solid rgba(192,192,200,.15)}
.search-wrap{max-width:600px;margin:0 auto;display:flex;gap:0}
.search-wrap input{flex:1;padding:10px 18px;border:2px solid #D4213D;border-right:none;border-radius:25px 0 0 25px;background:#1A1A2E;color:#fff;font-size:.95rem;outline:none}
.search-wrap input::placeholder{color:#888}
.search-wrap button{padding:10px 24px;background:#D4213D;color:#fff;border:2px solid #D4213D;border-radius:0 25px 25px 0;cursor:pointer;font-size:.95rem;transition:background .3s}
.search-wrap button:hover{background:#A8182F}

/* Banner */
.hero-banner{position:relative;height:520px;overflow:hidden;background:#1A1A2E}
.hero-banner img{width:100%;height:100%;object-fit:cover;filter:brightness(.65)}
.hero-overlay{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:20px;background:linear-gradient(180deg,rgba(26,26,46,.3) 0%,rgba(26,26,46,.7) 100%)}
.hero-overlay h1{color:#fff;font-size:2.8rem;margin-bottom:12px;text-shadow:0 3px 15px rgba(0,0,0,.6)}
.hero-overlay h1 em{font-style:normal;color:#D4213D}
.hero-overlay p{color:#C0C0C8;font-size:1.15rem;max-width:700px;line-height:1.8}

/* 面包屑 */
.breadcrumb{padding:14px 0;font-size:.88rem;color:#888}
.breadcrumb a{color:#D4213D}
.breadcrumb span{margin:0 6px;color:#aaa}

/* 通用区块 */
.section{padding:60px 0}
.section-dark{background:linear-gradient(135deg,#1A1A2E 0%,#2D2D3F 100%);color:#fff}
.section-alt{background:#EAEAE5}
.section-title{text-align:center;margin-bottom:45px}
.section-title h2{font-size:2rem;color:#1A1A2E;margin-bottom:8px;position:relative;display:inline-block}
.section-title h2::after{content:'';position:absolute;bottom:-8px;left:50%;transform:translateX(-50%);width:60px;height:4px;background:linear-gradient(90deg,#D4213D,#FF6B35);border-radius:2px}
.section-dark .section-title h2{color:#fff}
.section-title p{color:#777;font-size:1rem;margin-top:14px}
.section-dark .section-title p{color:#aaa}

/* 视频卡片网格 */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:transform .3s,box-shadow .3s}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(212,33,61,.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 .4s}
.video-card:hover .video-thumb img{transform:scale(1.08)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:64px;height:64px;background:rgba(212,33,61,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;cursor:pointer;box-shadow:0 4px 20px rgba(212,33,61,.4)}
.play-btn svg{width:28px;height:28px;fill:#fff;margin-left:4px}
.video-card:hover .play-btn{opacity:1}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;padding:3px 8px;border-radius:4px;font-size:.78rem}
.video-info{padding:16px}
.video-info h3{font-size:1.05rem;color:#1A1A2E;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:14px;font-size:.82rem;color:#999}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;background:rgba(212,33,61,.1);color:#D4213D;padding:2px 10px;border-radius:12px;font-size:.78rem;margin-top:8px}

/* 模块卡片 */
.mod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}
.mod-card{background:#fff;border-radius:12px;padding:32px 24px;text-align:center;box-shadow:0 4px 18px rgba(0,0,0,.06);transition:transform .3s,box-shadow .3s;border-top:4px solid transparent}
.mod-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px rgba(212,33,61,.12);border-top-color:#D4213D}
.mod-icon{width:60px;height:60px;background:linear-gradient(135deg,#D4213D,#FF6B35);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 18px;font-size:1.6rem;color:#fff}
.mod-card h3{font-size:1.15rem;color:#1A1A2E;margin-bottom:10px}
.mod-card p{color:#777;font-size:.92rem;line-height:1.7}

/* AI赋能区块 */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}
.ai-card{background:linear-gradient(135deg,#2D2D3F,#1A1A2E);border-radius:12px;padding:30px 24px;text-align:center;border:1px solid rgba(212,33,61,.3);transition:all .3s}
.ai-card:hover{border-color:#D4213D;box-shadow:0 0 25px rgba(212,33,61,.2)}
.ai-card h3{color:#fff;font-size:1.1rem;margin-bottom:10px}
.ai-card p{color:#aaa;font-size:.9rem;line-height:1.7}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;box-shadow:0 2px 12px rgba(0,0,0,.05);overflow:hidden}
.faq-q{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#1A1A2E;font-size:1rem;transition:background .3s}
.faq-q:hover{background:rgba(212,33,61,.05)}
.faq-q::after{content:'+';font-size:1.4rem;color:#D4213D;transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;color:#666;font-size:.94rem;line-height:1.8}
.faq-item.open .faq-a{max-height:300px;padding:0 24px 18px}

/* 用户评论 */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:25px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 16px rgba(0,0,0,.06)}
.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,#D4213D,#FF6B35);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem}
.review-name{font-weight:600;color:#1A1A2E;font-size:.95rem}
.review-stars{color:#FFB800;font-size:.9rem;letter-spacing:2px}
.review-text{color:#666;font-size:.92rem;line-height:1.8;font-style:italic}

/* 专家展示 */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:25px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 18px rgba(0,0,0,.06);text-align:center;transition:transform .3s}
.expert-card:hover{transform:translateY(-5px)}
.expert-card img{width:100%;height:220px;object-fit:cover}
.expert-card h4{padding:14px 12px 4px;font-size:1.05rem;color:#1A1A2E}
.expert-card p{padding:0 12px 14px;color:#888;font-size:.85rem}
.expert-btn{display:inline-block;margin:0 8px 16px;padding:6px 16px;border-radius:20px;font-size:.82rem;border:1px solid #D4213D;color:#D4213D;transition:all .3s}
.expert-btn:hover{background:#D4213D;color:#fff}

/* 合作品牌 */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;padding:20px 0}
.partner-wall span{background:#fff;padding:14px 28px;border-radius:8px;font-size:1rem;color:#555;box-shadow:0 2px 10px rgba(0,0,0,.06);font-weight:500}

/* 联系方式 */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px;align-items:start}
.contact-info{background:#fff;border-radius:12px;padding:30px;box-shadow:0 4px 18px rgba(0,0,0,.06)}
.contact-info h3{color:#1A1A2E;margin-bottom:16px;font-size:1.2rem}
.contact-info p{color:#666;margin-bottom:10px;font-size:.94rem;line-height:1.8}
.contact-qr{display:flex;gap:20px;justify-content:center}
.contact-qr div{text-align:center}
.contact-qr img{width:140px;height:140px;border-radius:8px;margin-bottom:8px}
.contact-qr p{font-size:.85rem;color:#888}

/* 社交分享 */
.share-bar{display:flex;gap:12px;justify-content:center;padding:20px 0}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 20px;border-radius:20px;font-size:.88rem;color:#fff;cursor:pointer;transition:transform .2s}
.share-btn:hover{transform:scale(1.05);color:#fff}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#111}
.share-bilibili{background:#00A1D6}

/* 页脚 */
.site-footer{background:#1A1A2E;color:#C0C0C8;padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;margin-bottom:40px}
.footer-col h4{color:#fff;font-size:1.05rem;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:35px;height:3px;background:#D4213D;border-radius:2px}
.footer-col p,.footer-col a{color:#999;font-size:.9rem;line-height:2;display:block}
.footer-col a:hover{color:#D4213D}
.footer-col img{border-radius:6px;margin-top:8px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;text-align:center;font-size:.85rem;color:#777}
.footer-logo{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.footer-logo img{height:36px}
.footer-logo span{color:#fff;font-weight:700;font-size:1.1rem}

/* 返回顶部 */
.back-top{position:fixed;bottom:30px;right:30px;width:46px;height:46px;background:#D4213D;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;transition:opacity .3s;box-shadow:0 4px 15px rgba(212,33,61,.4);z-index:999;font-size:1.2rem}
.back-top.show{opacity:1}

/* 内页通用 */
.page-hero{background:linear-gradient(135deg,#1A1A2E,#2D2D3F);padding:50px 0;text-align:center}
.page-hero h1{color:#fff;font-size:2.2rem;margin-bottom:8px}
.page-hero h1 em{font-style:normal;color:#D4213D}
.page-hero p{color:#aaa;font-size:1rem}

/* 响应式 */
@media(max-width:992px){
.video-grid,.mod-grid,.ai-grid{grid-template-columns:repeat(2,1fr)}
.expert-grid{grid-template-columns:repeat(2,1fr)}
.footer-grid{grid-template-columns:repeat(2,1fr)}
.hero-overlay h1{font-size:2rem}
}
@media(max-width:768px){
.nav-menu{display:none;position:absolute;top:68px;left:0;right:0;background:#1A1A2E;flex-direction:column;padding:10px 0;box-shadow:0 10px 30px rgba(0,0,0,.3)}
.nav-menu.open{display:flex}
.nav-toggle{display:flex}
.video-grid,.mod-grid,.ai-grid,.review-grid{grid-template-columns:1fr}
.expert-grid{grid-template-columns:repeat(2,1fr)}
.contact-grid{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr}
.hero-banner{height:350px}
.hero-overlay h1{font-size:1.6rem}
.hero-overlay p{font-size:.95rem}
.section{padding:40px 0}
}
@media(max-width:480px){
.expert-grid{grid-template-columns:1fr}
.nav-logo span{font-size:1rem}
.search-wrap input{font-size:.85rem}
}