/* ============================================
   福利姬汽车改装视频社区 - 原创样式表
   品牌色系：赛车红 #E63946 / 深夜蓝 #1D3557 / 钛金灰 #457B9D / 云白 #F1FAEE
   ============================================ */

/* === 基础重置 === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;color:#2b2d42;background:#fafbfc;line-height:1.7;overflow-x:hidden}
a{color:#1d3557;text-decoration:none;transition:color .2s}
a:hover{color:#e63946}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.d-none{display:none!important;visibility:hidden!important;position:absolute!important;width:0!important;height:0!important;overflow:hidden!important}

/* === 容器 === */
.kkt-container{max-width:1280px;margin:0 auto;padding:0 24px}

/* === 头部导航 === */
.kkt-header{background:linear-gradient(135deg,#1d3557 0%,#0d1b2a 100%);position:sticky;top:0;z-index:1000;box-shadow:0 2px 20px rgba(0,0,0,.3)}
.kkt-header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.kkt-logo-link{display:flex;align-items:center;gap:10px}
.kkt-logo-img{border-radius:8px}
.kkt-logo-text{font-size:1.35rem;font-weight:700;color:#f1faee;letter-spacing:1px}
.kkt-main-nav{display:flex;gap:6px}
.kkt-nav-item{color:#a8dadc;font-size:.92rem;padding:8px 16px;border-radius:6px;transition:all .25s;font-weight:500}
.kkt-nav-item:hover,.kkt-nav-item.active{color:#fff;background:rgba(230,57,70,.85)}
.kkt-mobile-btn{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.kkt-mobile-btn span{display:block;width:24px;height:2.5px;background:#f1faee;border-radius:2px;transition:all .3s}
.kkt-search-wrap{padding:0 0 12px}
.kkt-search-inner{display:flex;max-width:520px;margin:0 auto;background:rgba(255,255,255,.1);border-radius:24px;overflow:hidden;border:1px solid rgba(168,218,220,.25)}
.kkt-search-input{flex:1;padding:10px 20px;background:transparent;border:none;color:#f1faee;font-size:.9rem;outline:none}
.kkt-search-input::placeholder{color:rgba(168,218,220,.6)}
.kkt-search-btn{padding:10px 18px;background:transparent;border:none;color:#a8dadc;cursor:pointer;transition:color .2s}
.kkt-search-btn:hover{color:#e63946}

/* === 面包屑 === */
.kkt-breadcrumb{background:#f1faee;padding:12px 0;font-size:.85rem;border-bottom:1px solid #e0e6ed}
.kkt-bc-sep{margin:0 8px;color:#999}
.kkt-bc-current{color:#e63946;font-weight:500}

/* === 主横幅 === */
.kkt-hero{position:relative;min-height:520px;overflow:hidden}
.kkt-hero-bg{position:absolute;inset:0}
.kkt-hero-bg img{width:100%;height:100%;object-fit:cover}
.kkt-hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,27,42,.88) 0%,rgba(29,53,87,.72) 50%,rgba(230,57,70,.35) 100%);display:flex;align-items:center}
.kkt-hero-title{font-size:2.8rem;color:#fff;font-weight:800;margin-bottom:16px;text-shadow:0 2px 12px rgba(0,0,0,.4);line-height:1.3}
.kkt-hero-desc{font-size:1.12rem;color:#a8dadc;max-width:680px;margin-bottom:28px;line-height:1.8}
.kkt-hero-actions{display:flex;gap:16px;margin-bottom:36px;flex-wrap:wrap}
.kkt-hero-stats{display:flex;gap:40px;flex-wrap:wrap}
.kkt-stat-item{text-align:center;color:#f1faee}
.kkt-stat-item strong{display:block;font-size:1.6rem;color:#e63946;font-weight:800}
.kkt-stat-item span{font-size:.82rem;opacity:.8}

/* === 按钮 === */
.kkt-btn{display:inline-block;padding:12px 28px;border-radius:8px;font-weight:600;font-size:.95rem;transition:all .3s;cursor:pointer;border:2px solid transparent}
.kkt-btn-primary{background:#e63946;color:#fff;border-color:#e63946}
.kkt-btn-primary:hover{background:#c1121f;border-color:#c1121f;color:#fff;transform:translateY(-2px);box-shadow:0 6px 20px rgba(230,57,70,.4)}
.kkt-btn-outline{background:transparent;color:#f1faee;border-color:#a8dadc}
.kkt-btn-outline:hover{background:#a8dadc;color:#1d3557}
.kkt-btn-secondary{background:#1d3557;color:#f1faee;border-color:#1d3557}
.kkt-btn-secondary:hover{background:#457b9d;border-color:#457b9d;color:#fff}
.kkt-btn-sm{padding:6px 16px;font-size:.82rem;border-radius:6px;background:#e63946;color:#fff}
.kkt-btn-sm:hover{background:#c1121f;color:#fff}
.kkt-btn-outline-sm{background:transparent;color:#1d3557;border:1px solid #1d3557}
.kkt-btn-outline-sm:hover{background:#1d3557;color:#fff}

/* === 通用区块 === */
.kkt-section{padding:64px 0}
.kkt-section-alt{background:#f1faee}
.kkt-section-dark{background:linear-gradient(135deg,#1d3557 0%,#0d1b2a 100%);color:#f1faee}
.kkt-section-dark .kkt-section-desc{color:#a8dadc}
.kkt-section-header{text-align:center;margin-bottom:48px}
.kkt-section-title{font-size:2rem;font-weight:800;color:#1d3557;margin-bottom:12px;position:relative;display:inline-block}
.kkt-section-title::after{content:'';position:absolute;bottom:-8px;left:50%;transform:translateX(-50%);width:60px;height:4px;background:#e63946;border-radius:2px}
.kkt-section-dark .kkt-section-title{color:#f1faee}
.kkt-section-desc{font-size:1rem;color:#457b9d;max-width:720px;margin:16px auto 0;line-height:1.7}
.kkt-section-more{text-align:center;margin-top:36px}
.kkt-sub-title{font-size:1.5rem;font-weight:700;color:#1d3557;margin:40px 0 24px;padding-left:16px;border-left:4px solid #e63946}

/* === 视频卡片网格 === */
.kkt-video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.kkt-video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:all .35s}
.kkt-video-card:hover{transform:translateY(-6px);box-shadow:0 12px 32px rgba(0,0,0,.12)}
.kkt-video-thumb{position:relative;overflow:hidden;cursor:pointer;aspect-ratio:16/9}
.kkt-video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.kkt-video-card:hover .kkt-video-thumb img{transform:scale(1.06)}
.kkt-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);opacity:0;transition:opacity .3s}
.kkt-video-card:hover .kkt-play-btn{opacity:1}
.kkt-video-tag{position:absolute;top:10px;left:10px;background:#e63946;color:#fff;padding:3px 10px;border-radius:4px;font-size:.75rem;font-weight:600}
.kkt-video-thumb::after{content:attr(data-duration);position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}
.kkt-video-body{padding:16px}
.kkt-video-body h3{font-size:.95rem;font-weight:600;margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.kkt-video-body h3 a{color:#2b2d42}
.kkt-video-body h3 a:hover{color:#e63946}
.kkt-video-meta{display:flex;gap:12px;font-size:.78rem;color:#888;flex-wrap:wrap}
.kkt-video-tags{margin-top:8px;display:flex;gap:8px;flex-wrap:wrap}
.kkt-video-tags a{font-size:.78rem;color:#457b9d;background:#f1faee;padding:2px 8px;border-radius:4px}
.kkt-video-tags a:hover{background:#e63946;color:#fff}

/* === 模块卡片网格 === */
.kkt-module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.kkt-module-card{background:#fff;border-radius:12px;padding:28px;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:all .35s}
.kkt-module-card:hover{transform:translateY(-4px);box-shadow:0 8px 28px rgba(0,0,0,.1)}
.kkt-module-icon{font-size:2.2rem;margin-bottom:12px}
.kkt-module-card h3,.kkt-module-card h4{font-size:1.08rem;font-weight:700;color:#1d3557;margin-bottom:10px}
.kkt-module-card p{font-size:.9rem;color:#555;line-height:1.65}
.kkt-card-link{display:inline-block;margin-top:12px;color:#e63946;font-weight:600;font-size:.88rem}
.kkt-card-link:hover{color:#c1121f}
.kkt-card-dark{background:#1d3557;color:#f1faee}
.kkt-card-dark h4{color:#f1faee}
.kkt-card-dark p{color:#a8dadc}

/* === AI赋能 === */
.kkt-ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.kkt-ai-card{background:rgba(255,255,255,.08);border:1px solid rgba(168,218,220,.2);border-radius:14px;padding:32px;transition:all .35s}
.kkt-ai-card:hover{background:rgba(255,255,255,.12);border-color:rgba(230,57,70,.5);transform:translateY(-4px)}
.kkt-ai-icon{font-size:2.5rem;margin-bottom:14px}
.kkt-ai-card h3{font-size:1.1rem;font-weight:700;color:#f1faee;margin-bottom:12px}
.kkt-ai-card p{font-size:.9rem;color:#a8dadc;line-height:1.65;margin-bottom:14px}
.kkt-ai-features{display:flex;flex-direction:column;gap:6px}
.kkt-ai-features li{font-size:.85rem;color:#a8dadc;padding-left:18px;position:relative}
.kkt-ai-features li::before{content:'✓';position:absolute;left:0;color:#e63946;font-weight:700}

/* === 社区卡片 === */
.kkt-community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.kkt-community-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:all .35s}
.kkt-community-card:hover{transform:translateY(-4px);box-shadow:0 8px 28px rgba(0,0,0,.1)}
.kkt-community-card img{width:100%;height:180px;object-fit:cover}
.kkt-community-info{padding:18px}
.kkt-community-info h4{font-size:1.02rem;font-weight:700;color:#1d3557;margin-bottom:8px}
.kkt-community-info p{font-size:.88rem;color:#555;line-height:1.55;margin-bottom:8px}
.kkt-community-count{font-size:.8rem;color:#e63946;font-weight:600}

/* === 团队卡片 === */
.kkt-team-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(360px,1fr));gap:24px}
.kkt-team-card{display:flex;gap:20px;background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:all .35s}
.kkt-team-card:hover{transform:translateY(-4px);box-shadow:0 8px 28px rgba(0,0,0,.1)}
.kkt-team-card img{width:100px;height:100px;border-radius:50%;object-fit:cover;flex-shrink:0}
.kkt-team-info h4{font-size:1.05rem;font-weight:700;color:#1d3557;margin-bottom:4px}
.kkt-team-role{font-size:.85rem;color:#e63946;font-weight:600;margin-bottom:8px}
.kkt-team-bio{font-size:.85rem;color:#555;line-height:1.55;margin-bottom:6px}
.kkt-team-awards{font-size:.8rem;color:#457b9d;margin-bottom:10px}
.kkt-team-actions{display:flex;gap:8px}

/* === 合作品牌 === */
.kkt-partner-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:20px}
.kkt-partner-item{background:#f1faee;border:1px solid #e0e6ed;border-radius:10px;padding:18px 32px;font-size:1.1rem;font-weight:700;color:#1d3557;transition:all .3s}
.kkt-partner-item:hover{background:#1d3557;color:#f1faee;border-color:#1d3557}

/* === How-To步骤 === */
.kkt-howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.kkt-howto-step{text-align:center;padding:28px 20px;background:#fff;border-radius:12px;box-shadow:0 4px 16px rgba(0,0,0,.06)}
.kkt-step-num{font-size:2.2rem;font-weight:900;color:#e63946;margin-bottom:12px}
.kkt-howto-step h4{font-size:1rem;font-weight:700;color:#1d3557;margin-bottom:10px}
.kkt-howto-step p{font-size:.88rem;color:#555;line-height:1.55}

/* === FAQ === */
.kkt-faq-list{max-width:800px;margin:0 auto}
.kkt-faq-item{border:1px solid #e0e6ed;border-radius:10px;margin-bottom:12px;overflow:hidden;background:#fff}
.kkt-faq-q{display:flex;justify-content:space-between;align-items:center;padding:18px 24px;cursor:pointer;transition:background .2s}
.kkt-faq-q:hover{background:#f1faee}
.kkt-faq-q h4{font-size:.98rem;font-weight:600;color:#1d3557;flex:1}
.kkt-faq-toggle{font-size:1.4rem;color:#e63946;font-weight:700;transition:transform .3s;flex-shrink:0;margin-left:12px}
.kkt-faq-item.open .kkt-faq-toggle{transform:rotate(45deg)}
.kkt-faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease}
.kkt-faq-item.open .kkt-faq-a{max-height:300px;padding:0 24px 18px}
.kkt-faq-a p{font-size:.9rem;color:#555;line-height:1.7}

/* === 评价 === */
.kkt-review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.kkt-review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:all .35s}
.kkt-review-card:hover{transform:translateY(-4px);box-shadow:0 8px 28px rgba(0,0,0,.1)}
.kkt-review-stars{color:#e63946;font-size:1.1rem;margin-bottom:12px;letter-spacing:2px}
.kkt-review-text{font-size:.9rem;color:#444;line-height:1.65;margin-bottom:14px;font-style:italic}
.kkt-review-author strong{display:block;font-size:.88rem;color:#1d3557}
.kkt-review-author span{font-size:.78rem;color:#888}

/* === 分享 === */
.kkt-share-bar{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.kkt-share-btn{padding:10px 24px;border-radius:8px;font-weight:600;font-size:.9rem;color:#fff;transition:all .3s}
.kkt-share-wechat{background:#07c160}
.kkt-share-weibo{background:#e6162d}
.kkt-share-douyin{background:#161823}
.kkt-share-bilibili{background:#00a1d6}
.kkt-share-qq{background:#12b7f5}
.kkt-share-btn:hover{opacity:.85;transform:translateY(-2px);color:#fff}

/* === 联系我们 === */
.kkt-contact-grid{display:grid;grid-template-columns:2fr 1fr;gap:40px;align-items:start}
.kkt-contact-item{margin-bottom:24px}
.kkt-contact-item h4{font-size:1.05rem;font-weight:700;margin-bottom:10px}
.kkt-section-dark .kkt-contact-item h4{color:#f1faee}
.kkt-contact-item p{font-size:.9rem;line-height:1.7}
.kkt-section-dark .kkt-contact-item p{color:#a8dadc}
.kkt-qr-grid{display:flex;gap:24px;justify-content:center}
.kkt-qr-item{text-align:center}
.kkt-qr-item img{border-radius:10px;margin-bottom:8px}
.kkt-qr-item p{font-size:.85rem;font-weight:600}
.kkt-section-dark .kkt-qr-item p{color:#a8dadc}

/* === 底部 === */
.kkt-footer{background:#0d1b2a;color:#a8dadc;padding:48px 0 0}
.kkt-footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;padding-bottom:32px;border-bottom:1px solid rgba(168,218,220,.15)}
.kkt-footer-col h5{color:#f1faee;font-size:1rem;font-weight:700;margin-bottom:14px}
.kkt-footer-col p{font-size:.85rem;line-height:1.6;margin-bottom:8px}
.kkt-footer-col a{display:block;font-size:.85rem;color:#a8dadc;padding:4px 0;transition:color .2s}
.kkt-footer-col a:hover{color:#e63946}
.kkt-footer-col img{margin-bottom:10px;border-radius:6px}
.kkt-footer-nav{text-align:center;padding:20px 0;font-size:.85rem}
.kkt-footer-nav a{color:#a8dadc;margin:0 4px}
.kkt-footer-nav a:hover{color:#e63946}
.kkt-footer-bottom{text-align:center;padding:16px 0;font-size:.82rem;color:#6c7a8a;border-top:1px solid rgba(168,218,220,.1)}
.kkt-footer-bottom a{color:#a8dadc}

/* === 关于页面 === */
.kkt-about-content h2{font-size:1.5rem;font-weight:700;color:#1d3557;margin:40px 0 16px;padding-left:16px;border-left:4px solid #e63946}
.kkt-about-content p{font-size:.95rem;color:#444;line-height:1.8;margin-bottom:16px}

/* === 移动端响应式 === */
@media(max-width:1024px){
  .kkt-video-grid{grid-template-columns:repeat(3,1fr)}
  .kkt-ai-grid,.kkt-community-grid,.kkt-review-grid{grid-template-columns:repeat(2,1fr)}
  .kkt-howto-steps{grid-template-columns:repeat(2,1fr)}
  .kkt-hero-title{font-size:2.2rem}
}
@media(max-width:768px){
  .kkt-main-nav{display:none;position:absolute;top:68px;left:0;right:0;background:#1d3557;flex-direction:column;padding:16px;box-shadow:0 8px 24px rgba(0,0,0,.3)}
  .kkt-main-nav.open{display:flex}
  .kkt-mobile-btn{display:flex}
  .kkt-video-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .kkt-module-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .kkt-ai-grid{grid-template-columns:1fr}
  .kkt-community-grid{grid-template-columns:1fr}
  .kkt-review-grid{grid-template-columns:1fr}
  .kkt-team-grid{grid-template-columns:1fr}
  .kkt-team-card{flex-direction:column;align-items:center;text-align:center}
  .kkt-howto-steps{grid-template-columns:1fr}
  .kkt-hero{min-height:420px}
  .kkt-hero-title{font-size:1.8rem}
  .kkt-hero-desc{font-size:1rem}
  .kkt-hero-stats{gap:20px}
  .kkt-stat-item strong{font-size:1.3rem}
  .kkt-footer-grid{grid-template-columns:1fr 1fr}
  .kkt-contact-grid{grid-template-columns:1fr}
  .kkt-section{padding:40px 0}
}
@media(max-width:480px){
  .kkt-video-grid{grid-template-columns:1fr}
  .kkt-module-grid{grid-template-columns:1fr}
  .kkt-footer-grid{grid-template-columns:1fr}
  .kkt-hero-title{font-size:1.5rem}
  .kkt-hero-actions{flex-direction:column;gap:10px}
  .kkt-hero-stats{flex-direction:column;gap:12px}
  .kkt-share-bar{flex-direction:column;align-items:center}
}

/* === EEAT认证标识 === */
.kkt-team-cert{font-size:.78rem;color:#e63946;font-weight:600;padding:4px 0;border-top:1px dashed #e0e6ed;margin-top:6px}

/* === 时效性更新标识 === */
.kkt-update-time{display:inline-block;font-size:.78rem;color:#457b9d;margin-top:8px;padding:3px 10px;background:#f1faee;border-radius:4px;border:1px solid #e0e6ed}