/* ========================================
   玩物社区 - 原创赛车风格CSS
   品牌：玩物社区 | Luuhmff.cn
   配色：赛车红+深夜蓝黑+金属金
   ======================================== */

/* === 基础重置 === */
*,*::before,*::after{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;background:#0D0D1A;color:#E8E8F0;line-height:1.7;overflow-x:hidden}
a{color:#F5A623;text-decoration:none;transition:color .3s}
a:hover{color:#E8372C}
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:#FFFFFF}

/* === 容器 === */
.kkt-container{width:100%;max-width:1280px;margin:0 auto;padding:0 20px}
.kkt-section{padding:60px 0}
.kkt-section-alt{padding:60px 0;background:#12122A}

/* === 头部导航 === */
.kkt-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(13,13,26,.95);backdrop-filter:blur(12px);border-bottom:1px solid rgba(232,55,44,.2);transition:all .3s}
.kkt-header-inner{display:flex;align-items:center;justify-content:space-between;height:72px;max-width:1280px;margin:0 auto;padding:0 20px}
.kkt-logo{display:flex;align-items:center;gap:10px}
.kkt-logo img{height:42px;width:auto}
.kkt-logo span{font-size:22px;font-weight:800;color:#FFFFFF;letter-spacing:1px}
.kkt-logo em{font-style:normal;color:#E8372C}
.kkt-nav{display:flex;align-items:center;gap:6px}
.kkt-nav a{padding:8px 14px;font-size:14px;color:#B8B8CC;border-radius:6px;transition:all .3s;white-space:nowrap}
.kkt-nav a:hover,.kkt-nav a.active{color:#FFFFFF;background:rgba(232,55,44,.15)}
.kkt-mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.kkt-mobile-toggle span{width:24px;height:2px;background:#FFFFFF;transition:all .3s}

/* === 搜索框 === */
.kkt-search-bar{background:rgba(22,22,42,.9);border-bottom:1px solid rgba(245,166,35,.1);padding:12px 0}
.kkt-search-bar .kkt-container{display:flex;justify-content:center}
.kkt-search-wrap{position:relative;width:100%;max-width:620px}
.kkt-search-wrap input{width:100%;height:44px;padding:0 50px 0 20px;background:#1A1A2E;border:1px solid rgba(232,55,44,.3);border-radius:22px;color:#FFFFFF;font-size:14px;outline:none;transition:border-color .3s}
.kkt-search-wrap input:focus{border-color:#E8372C}
.kkt-search-wrap input::placeholder{color:#666680}
.kkt-search-btn{position:absolute;right:4px;top:4px;width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#E8372C,#F5A623);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center}
.kkt-search-btn svg{width:18px;height:18px;fill:#FFFFFF}

/* === Hero Banner === */
.kkt-hero{position:relative;height:520px;overflow:hidden;margin-top:72px}
.kkt-hero-slide{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;transition:opacity 1s}
.kkt-hero-slide.active{opacity:1}
.kkt-hero-slide img{width:100%;height:100%;object-fit:cover}
.kkt-hero-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(180deg,rgba(13,13,26,.3) 0%,rgba(13,13,26,.85) 100%)}
.kkt-hero-content{position:absolute;bottom:80px;left:0;width:100%;text-align:center;z-index:2}
.kkt-hero-content h1{font-size:42px;margin-bottom:12px;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.kkt-hero-content h1 em{font-style:normal;color:#E8372C}
.kkt-hero-content p{font-size:18px;color:#B8B8CC;max-width:680px;margin:0 auto 24px}
.kkt-hero-tags{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}
.kkt-hero-tags span{padding:6px 16px;background:rgba(232,55,44,.2);border:1px solid rgba(232,55,44,.4);border-radius:20px;font-size:13px;color:#F5A623}

/* === 通用标题 === */
.kkt-title-box{text-align:center;margin-bottom:48px}
.kkt-title-box h2{font-size:32px;margin-bottom:10px}
.kkt-title-box h2 em{font-style:normal;color:#E8372C}
.kkt-title-box p{font-size:15px;color:#8888A0;max-width:600px;margin:0 auto}
.kkt-title-line{width:60px;height:3px;background:linear-gradient(90deg,#E8372C,#F5A623);margin:16px auto 0;border-radius:2px}

/* === 视频卡片 === */
.kkt-video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.kkt-video-card{position:relative;border-radius:12px;overflow:hidden;background:#16162A;transition:transform .3s,box-shadow .3s;cursor:pointer}
.kkt-video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(232,55,44,.2)}
.kkt-video-thumb{position:relative;padding-top:56.25%;overflow:hidden}
.kkt-video-thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.kkt-video-card:hover .kkt-video-thumb img{transform:scale(1.08)}
.kkt-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:56px;height:56px;background:rgba(232,55,44,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform .3s;z-index:2}
.kkt-play-btn::after{content:"";width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #FFFFFF;margin-left:3px}
.kkt-video-card:hover .kkt-play-btn{transform:translate(-50%,-50%) scale(1)}
.kkt-video-duration{position:absolute;bottom:8px;right:8px;padding:2px 8px;background:rgba(0,0,0,.75);border-radius:4px;font-size:12px;color:#FFF;z-index:2}
.kkt-video-info{padding:16px}
.kkt-video-info h3{font-size:15px;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.kkt-video-meta{display:flex;align-items:center;gap:12px;font-size:12px;color:#8888A0}
.kkt-video-meta span{display:flex;align-items:center;gap:4px}

/* === 汽车传媒模块 === */
.kkt-media-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.kkt-media-card{padding:28px;background:#16162A;border-radius:12px;border:1px solid rgba(245,166,35,.1);transition:all .3s;text-align:center}
.kkt-media-card:hover{border-color:#E8372C;transform:translateY(-4px);box-shadow:0 8px 30px rgba(232,55,44,.15)}
.kkt-media-icon{width:56px;height:56px;margin:0 auto 16px;background:linear-gradient(135deg,#E8372C,#F5A623);border-radius:14px;display:flex;align-items:center;justify-content:center}
.kkt-media-icon svg{width:28px;height:28px;fill:#FFFFFF}
.kkt-media-card h4{font-size:17px;margin-bottom:8px}
.kkt-media-card p{font-size:13px;color:#8888A0;line-height:1.6}

/* === AI赋能模块 === */
.kkt-ai-wrap{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.kkt-ai-img{border-radius:16px;overflow:hidden;box-shadow:0 8px 40px rgba(232,55,44,.15)}
.kkt-ai-img img{width:100%;display:block}
.kkt-ai-list{display:flex;flex-direction:column;gap:20px}
.kkt-ai-item{padding:20px;background:#16162A;border-radius:10px;border-left:3px solid #E8372C;transition:all .3s}
.kkt-ai-item:hover{background:#1A1A34;border-left-color:#F5A623}
.kkt-ai-item h4{font-size:16px;margin-bottom:6px;color:#F5A623}
.kkt-ai-item p{font-size:13px;color:#8888A0}

/* === 社区模块 === */
.kkt-community-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.kkt-community-card{background:#16162A;border-radius:12px;overflow:hidden;transition:all .3s}
.kkt-community-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(245,166,35,.15)}
.kkt-community-card .thumb{position:relative;padding-top:60%;overflow:hidden}
.kkt-community-card .thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.kkt-community-card:hover .thumb img{transform:scale(1.06)}
.kkt-community-card .tag{position:absolute;top:10px;left:10px;padding:3px 10px;background:rgba(232,55,44,.85);border-radius:4px;font-size:11px;color:#FFF;z-index:1}
.kkt-community-card .info{padding:14px}
.kkt-community-card .info h4{font-size:14px;margin-bottom:4px}
.kkt-community-card .info p{font-size:12px;color:#8888A0}

/* === 专家展示 === */
.kkt-expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.kkt-expert-card{background:#16162A;border-radius:12px;padding:28px 20px;text-align:center;border:1px solid rgba(245,166,35,.08);transition:all .3s}
.kkt-expert-card:hover{border-color:#F5A623;transform:translateY(-4px)}
.kkt-expert-avatar{width:90px;height:90px;border-radius:50%;margin:0 auto 16px;overflow:hidden;border:3px solid #E8372C}
.kkt-expert-avatar img{width:100%;height:100%;object-fit:cover}
.kkt-expert-card h4{font-size:16px;margin-bottom:4px}
.kkt-expert-card .role{font-size:13px;color:#F5A623;margin-bottom:10px}
.kkt-expert-card p{font-size:12px;color:#8888A0;margin-bottom:14px;line-height:1.6}
.kkt-expert-btns{display:flex;gap:8px;justify-content:center}
.kkt-btn-sm{padding:6px 14px;font-size:12px;border-radius:6px;border:1px solid #E8372C;color:#E8372C;transition:all .3s;cursor:pointer;background:transparent}
.kkt-btn-sm:hover{background:#E8372C;color:#FFF}
.kkt-btn-sm.gold{border-color:#F5A623;color:#F5A623}
.kkt-btn-sm.gold:hover{background:#F5A623;color:#0D0D1A}

/* === 合作品牌 === */
.kkt-partner-wall{display:flex;justify-content:center;align-items:center;gap:40px;flex-wrap:wrap;padding:20px 0}
.kkt-partner-wall img{height:60px;width:auto;filter:grayscale(1) brightness(.7);transition:all .3s}
.kkt-partner-wall img:hover{filter:grayscale(0) brightness(1)}

/* === FAQ === */
.kkt-faq-list{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.kkt-faq-item{background:#16162A;border-radius:10px;overflow:hidden;border:1px solid rgba(232,55,44,.1)}
.kkt-faq-q{padding:18px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:15px;font-weight:600;color:#FFFFFF;transition:background .3s}
.kkt-faq-q:hover{background:rgba(232,55,44,.08)}
.kkt-faq-q .arrow{width:20px;height:20px;transition:transform .3s;color:#F5A623}
.kkt-faq-a{padding:0 20px;max-height:0;overflow:hidden;transition:all .4s;font-size:14px;color:#8888A0;line-height:1.8}
.kkt-faq-item.open .kkt-faq-a{padding:0 20px 18px;max-height:300px}
.kkt-faq-item.open .arrow{transform:rotate(180deg)}

/* === 用户评价 === */
.kkt-review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.kkt-review-card{background:#16162A;border-radius:12px;padding:24px;border:1px solid rgba(245,166,35,.08)}
.kkt-review-head{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.kkt-review-head .avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#E8372C,#F5A623);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;color:#FFF}
.kkt-review-head .name{font-size:14px;font-weight:600}
.kkt-review-head .date{font-size:12px;color:#666680}
.kkt-review-stars{color:#F5A623;font-size:14px;margin-bottom:8px;letter-spacing:2px}
.kkt-review-card p{font-size:13px;color:#B8B8CC;line-height:1.7}

/* === 联系我们 === */
.kkt-contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.kkt-contact-info{display:flex;flex-direction:column;gap:16px}
.kkt-contact-item{display:flex;align-items:flex-start;gap:14px;padding:16px;background:#16162A;border-radius:10px}
.kkt-contact-icon{width:40px;height:40px;min-width:40px;background:linear-gradient(135deg,#E8372C,#F5A623);border-radius:10px;display:flex;align-items:center;justify-content:center}
.kkt-contact-icon svg{width:20px;height:20px;fill:#FFF}
.kkt-contact-item h5{font-size:14px;margin-bottom:2px}
.kkt-contact-item p{font-size:13px;color:#8888A0}
.kkt-contact-store img{width:100%;border-radius:12px}

/* === How-To指南 === */
.kkt-howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.kkt-howto-step{background:#16162A;border-radius:12px;padding:28px 20px;text-align:center;position:relative;counter-increment:step}
.kkt-howto-step::before{content:counter(step);position:absolute;top:-14px;left:50%;transform:translateX(-50%);width:28px;height:28px;background:linear-gradient(135deg,#E8372C,#F5A623);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#FFF}
.kkt-howto-step h4{font-size:15px;margin-bottom:8px;margin-top:8px}
.kkt-howto-step p{font-size:13px;color:#8888A0}

/* === 社交分享 === */
.kkt-share-bar{display:flex;justify-content:center;gap:16px;padding:20px 0}
.kkt-share-btn{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .3s;cursor:pointer;border:none}
.kkt-share-btn.wechat{background:#07C160}
.kkt-share-btn.weibo{background:#E6162D}
.kkt-share-btn.douyin{background:#161823}
.kkt-share-btn.bilibili{background:#00A1D6}
.kkt-share-btn svg{width:22px;height:22px;fill:#FFF}
.kkt-share-btn:hover{transform:scale(1.15);box-shadow:0 4px 16px rgba(0,0,0,.3)}

/* === 页脚 === */
.kkt-footer{background:#08081A;border-top:1px solid rgba(232,55,44,.15);padding:48px 0 24px}
.kkt-footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px;margin-bottom:36px}
.kkt-footer-brand{display:flex;flex-direction:column;gap:12px}
.kkt-footer-brand img{height:36px;width:auto}
.kkt-footer-brand p{font-size:13px;color:#666680;line-height:1.7}
.kkt-footer h5{font-size:14px;margin-bottom:14px;color:#F5A623}
.kkt-footer-links{display:flex;flex-direction:column;gap:8px}
.kkt-footer-links a{font-size:13px;color:#8888A0;transition:color .3s}
.kkt-footer-links a:hover{color:#E8372C}
.kkt-footer-qr{display:flex;gap:20px}
.kkt-footer-qr .qr-item{text-align:center}
.kkt-footer-qr .qr-item img{width:100px;height:100px;border-radius:8px;margin-bottom:6px}
.kkt-footer-qr .qr-item span{font-size:11px;color:#666680}
.kkt-footer-bottom{border-top:1px solid rgba(255,255,255,.06);padding-top:20px;text-align:center;font-size:12px;color:#555570}
.kkt-footer-bottom a{color:#8888A0}

/* === 面包屑 === */
.kkt-breadcrumb{padding:16px 0;font-size:13px;color:#666680}
.kkt-breadcrumb a{color:#8888A0}
.kkt-breadcrumb span{color:#E8372C}

/* === 内页通用 === */
.kkt-page-hero{height:280px;position:relative;overflow:hidden;margin-top:72px;display:flex;align-items:center;justify-content:center}
.kkt-page-hero img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}
.kkt-page-hero .overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(13,13,26,.8)}
.kkt-page-hero .content{position:relative;z-index:2;text-align:center}
.kkt-page-hero h1{font-size:36px;margin-bottom:8px}
.kkt-page-hero p{font-size:15px;color:#B8B8CC}

/* === 按钮 === */
.kkt-btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:all .3s;border:none}
.kkt-btn-primary{background:linear-gradient(135deg,#E8372C,#D42E24);color:#FFF}
.kkt-btn-primary:hover{box-shadow:0 6px 24px rgba(232,55,44,.4);transform:translateY(-2px)}
.kkt-btn-outline{background:transparent;border:1px solid #F5A623;color:#F5A623}
.kkt-btn-outline:hover{background:#F5A623;color:#0D0D1A}

/* === MCP前端代码区域 === */
.kkt-mcp-widget{background:#16162A;border:1px solid rgba(232,55,44,.15);border-radius:10px;padding:20px;margin-top:20px;text-align:center}
.kkt-mcp-widget p{font-size:13px;color:#666680}

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

/* === EEAT信任模块 === */
.kkt-trust-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:20px;text-align:center}
.kkt-trust-item{background:#16162A;border-radius:12px;padding:28px 16px;border:1px solid rgba(245,166,35,.08);transition:all .3s}
.kkt-trust-item:hover{border-color:#F5A623;transform:translateY(-4px)}
.kkt-trust-num{font-size:28px;font-weight:800;color:#F5A623;margin-bottom:6px;background:linear-gradient(135deg,#E8372C,#F5A623);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.kkt-trust-label{font-size:13px;color:#8888A0}

/* === 视频NEW标签 === */
.kkt-video-new{position:absolute;top:8px;left:8px;padding:2px 10px;background:linear-gradient(135deg,#E8372C,#F5A623);border-radius:4px;font-size:11px;font-weight:700;color:#FFF;z-index:2;letter-spacing:1px}

/* === 视频video标签样式 === */
.kkt-video-thumb video{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;background:#0D0D1A}

/* === 回到顶部按钮 === */
.kkt-back-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:linear-gradient(135deg,#E8372C,#F5A623);color:#FFF;border-radius:50%;display:none;align-items:center;justify-content:center;cursor:pointer;font-size:18px;z-index:999;box-shadow:0 4px 16px rgba(232,55,44,.3);transition:all .3s}
.kkt-back-top:hover{transform:scale(1.1);box-shadow:0 6px 24px rgba(232,55,44,.5)}

/* === 响应式 === */
@media(max-width:1024px){
.kkt-video-grid{grid-template-columns:repeat(2,1fr)}
.kkt-media-grid{grid-template-columns:repeat(2,1fr)}
.kkt-expert-grid{grid-template-columns:repeat(2,1fr)}
.kkt-community-grid{grid-template-columns:repeat(2,1fr)}
.kkt-footer-grid{grid-template-columns:1fr 1fr}
.kkt-howto-steps{grid-template-columns:repeat(2,1fr)}
.kkt-trust-grid{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:768px){
.kkt-nav{display:none;position:absolute;top:72px;left:0;width:100%;background:rgba(13,13,26,.98);flex-direction:column;padding:20px;gap:4px}
.kkt-nav.open{display:flex}
.kkt-mobile-toggle{display:flex}
.kkt-hero{height:400px}
.kkt-hero-content h1{font-size:28px}
.kkt-video-grid{grid-template-columns:1fr}
.kkt-media-grid{grid-template-columns:1fr}
.kkt-ai-wrap{grid-template-columns:1fr}
.kkt-expert-grid{grid-template-columns:1fr}
.kkt-community-grid{grid-template-columns:1fr}
.kkt-contact-grid{grid-template-columns:1fr}
.kkt-review-grid{grid-template-columns:1fr}
.kkt-footer-grid{grid-template-columns:1fr}
.kkt-howto-steps{grid-template-columns:1fr}
.kkt-trust-grid{grid-template-columns:repeat(2,1fr)}
.kkt-title-box h2{font-size:24px}
.kkt-page-hero{height:200px}
.kkt-page-hero h1{font-size:26px}
}

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

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