/* 困困兔汽车改装视频社区 - 原创CSS */
:root{--kk-primary:#1a2332;--kk-secondary:#ff6b35;--kk-accent:#2d4a7a;--kk-dark:#0d1520;--kk-light:#f4f6f9;--kk-text:#e8edf3;--kk-muted:#8a9bb5;--kk-card:#1e2d42;--kk-border:#2a3f5c;--kk-gold:#ffb347;--kk-success:#27ae60;--kk-gradient:linear-gradient(135deg,#1a2332 0%,#2d4a7a 100%)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;background:var(--kk-dark);color:var(--kk-text);line-height:1.8;overflow-x:hidden}
.kk-container{max-width:1200px;margin:0 auto;padding:0 20px}
a{color:var(--kk-secondary);text-decoration:none;transition:all .3s}
a:hover{color:var(--kk-gold)}
img{max-width:100%;height:auto}
.kk-cloak{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;opacity:0;pointer-events:none}
/* 导航栏 */
.kk-navbar{background:var(--kk-primary);border-bottom:2px solid var(--kk-secondary);position:sticky;top:0;z-index:1000;box-shadow:0 2px 20px rgba(0,0,0,.4)}
.kk-navbar-inner{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto;padding:0 20px;height:68px}
.kk-logo-link{display:flex;align-items:center;gap:10px}
.kk-logo-img{height:42px;width:auto}
.kk-logo-text{font-size:1.4rem;font-weight:700;color:var(--kk-secondary);letter-spacing:1px}
.kk-nav-menu{display:flex;list-style:none;gap:6px}
.kk-nav-menu li a{color:var(--kk-text);padding:8px 14px;border-radius:6px;font-size:.95rem;transition:all .3s}
.kk-nav-menu li a:hover,.kk-nav-menu li a.active{background:var(--kk-secondary);color:#fff}
.kk-mobile-toggle{display:none;background:none;border:2px solid var(--kk-secondary);color:var(--kk-secondary);font-size:1.5rem;padding:4px 10px;border-radius:6px;cursor:pointer}
/* 搜索栏 */
.kk-search-bar{background:var(--kk-accent);padding:12px 0}
.kk-search-form{display:flex;max-width:600px;margin:0 auto}
.kk-search-input{flex:1;padding:10px 18px;border:2px solid var(--kk-border);border-right:none;border-radius:25px 0 0 25px;background:var(--kk-card);color:var(--kk-text);font-size:.95rem;outline:none}
.kk-search-input:focus{border-color:var(--kk-secondary)}
.kk-search-btn{padding:10px 24px;background:var(--kk-secondary);color:#fff;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:.95rem;font-weight:600;transition:background .3s}
.kk-search-btn:hover{background:var(--kk-gold)}
/* Hero区域 */
.kk-hero{position:relative;min-height:520px;display:flex;align-items:center;justify-content:center;text-align:center;background-size:cover;background-position:center;background-repeat:no-repeat}
.kk-hero::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(26,35,50,.92),rgba(45,74,122,.78))}
.kk-hero-content{position:relative;z-index:2;padding:40px 20px;max-width:800px}
.kk-hero h1{font-size:2.6rem;margin-bottom:16px;line-height:1.3}
.kk-hero h1 .kk-brand-hl{color:var(--kk-secondary);font-size:3rem}
.kk-hero p{font-size:1.15rem;color:var(--kk-muted);margin-bottom:24px;line-height:1.8}
.kk-hero-tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.kk-hero-tag{background:rgba(255,107,53,.15);color:var(--kk-secondary);padding:6px 16px;border-radius:20px;font-size:.85rem;border:1px solid rgba(255,107,53,.3)}
/* 区块标题 */
.kk-section{padding:60px 0}
.kk-section-title{text-align:center;margin-bottom:45px}
.kk-section-title h2{font-size:2rem;margin-bottom:10px;position:relative;display:inline-block}
.kk-section-title h2::after{content:'';display:block;width:60px;height:3px;background:var(--kk-secondary);margin:12px auto 0}
.kk-section-title p{color:var(--kk-muted);font-size:1rem;margin-top:10px}
.kk-orange{color:var(--kk-secondary)}
/* 视频卡片网格 */
.kk-video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.kk-video-card{background:var(--kk-card);border-radius:12px;overflow:hidden;transition:transform .3s,box-shadow .3s;border:1px solid var(--kk-border)}
.kk-video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(255,107,53,.15)}
.kk-video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.kk-video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.kk-video-card:hover .kk-video-thumb img{transform:scale(1.08)}
.kk-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:56px;height:56px;background:rgba(255,107,53,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform .3s;pointer-events:none}
.kk-play-btn::after{content:'';display:block;width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:3px}
.kk-video-card:hover .kk-play-btn{transform:translate(-50%,-50%) scale(1)}
.kk-video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}
.kk-video-info{padding:14px}
.kk-video-info h4{font-size:.95rem;margin-bottom:6px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.kk-video-meta{display:flex;gap:12px;color:var(--kk-muted);font-size:.8rem}
/* 模块网格 */
.kk-module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.kk-module-card{background:var(--kk-card);border-radius:12px;padding:28px;border:1px solid var(--kk-border);transition:all .3s}
.kk-module-card:hover{border-color:var(--kk-secondary);box-shadow:0 8px 25px rgba(255,107,53,.1)}
.kk-module-icon{font-size:2.2rem;margin-bottom:14px}
.kk-module-card h4{font-size:1.1rem;margin-bottom:10px;color:var(--kk-secondary)}
.kk-module-card p{color:var(--kk-muted);font-size:.9rem;line-height:1.7}
/* 专家卡片 */
.kk-expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.kk-expert-card{background:var(--kk-card);border-radius:12px;padding:24px;text-align:center;border:1px solid var(--kk-border);transition:all .3s}
.kk-expert-card:hover{border-color:var(--kk-secondary);transform:translateY(-4px)}
.kk-expert-avatar{width:90px;height:90px;border-radius:50%;object-fit:cover;margin-bottom:14px;border:3px solid var(--kk-secondary)}
.kk-expert-card h4{font-size:1rem;margin-bottom:4px}
.kk-expert-card .kk-expert-role{color:var(--kk-secondary);font-size:.85rem;margin-bottom:8px}
.kk-expert-card p{color:var(--kk-muted);font-size:.85rem;line-height:1.6}
.kk-expert-btn{display:inline-block;margin-top:10px;padding:6px 16px;background:var(--kk-secondary);color:#fff;border-radius:20px;font-size:.8rem;transition:background .3s}
.kk-expert-btn:hover{background:var(--kk-gold);color:#fff}
/* FAQ */
.kk-faq-list{max-width:800px;margin:0 auto}
.kk-faq-item{background:var(--kk-card);border-radius:10px;margin-bottom:12px;border:1px solid var(--kk-border);overflow:hidden}
.kk-faq-q{padding:16px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.95rem;transition:background .3s}
.kk-faq-q:hover{background:rgba(255,107,53,.08)}
.kk-faq-q::after{content:'+';font-size:1.3rem;color:var(--kk-secondary);transition:transform .3s}
.kk-faq-item.active .kk-faq-q::after{transform:rotate(45deg)}
.kk-faq-a{padding:0 20px;max-height:0;overflow:hidden;transition:all .4s;color:var(--kk-muted);font-size:.9rem;line-height:1.8}
.kk-faq-item.active .kk-faq-a{padding:0 20px 16px;max-height:300px}
/* 用户评论 */
.kk-review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.kk-review-card{background:var(--kk-card);border-radius:12px;padding:24px;border:1px solid var(--kk-border)}
.kk-review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.kk-review-avatar{width:44px;height:44px;border-radius:50%;background:var(--kk-accent);display:flex;align-items:center;justify-content:center;color:var(--kk-secondary);font-weight:700;font-size:1.1rem}
.kk-review-name{font-weight:600;font-size:.95rem}
.kk-review-stars{color:var(--kk-gold);font-size:.85rem}
.kk-review-text{color:var(--kk-muted);font-size:.9rem;line-height:1.7}
/* 联系卡片 */
.kk-contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.kk-contact-card{background:var(--kk-card);border-radius:12px;padding:24px;border:1px solid var(--kk-border)}
.kk-contact-card h4{font-size:1.05rem;margin-bottom:14px;color:var(--kk-secondary)}
.kk-contact-item{padding:6px 0;color:var(--kk-muted);font-size:.9rem}
/* 二维码 */
.kk-qr-grid{display:flex;gap:30px;justify-content:center;flex-wrap:wrap}
.kk-qr-item{text-align:center}
.kk-qr-item img{width:140px;height:140px;border-radius:8px;border:2px solid var(--kk-border)}
.kk-qr-item p{margin-top:8px;font-size:.85rem;color:var(--kk-muted)}
/* 合作品牌 */
.kk-brand-wall{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;align-items:center}
.kk-brand-item{background:var(--kk-card);padding:16px 28px;border-radius:10px;border:1px solid var(--kk-border);color:var(--kk-muted);font-size:.95rem;font-weight:600;transition:all .3s}
.kk-brand-item:hover{border-color:var(--kk-secondary);color:var(--kk-secondary)}
/* How-To */
.kk-howto-steps{max-width:700px;margin:0 auto}
.kk-howto-step{display:flex;gap:18px;margin-bottom:24px;align-items:flex-start}
.kk-step-num{width:42px;height:42px;min-width:42px;background:var(--kk-secondary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.1rem}
.kk-step-content h4{font-size:1rem;margin-bottom:4px}
.kk-step-content p{color:var(--kk-muted);font-size:.9rem}
/* 页面头部 */
.kk-page-header{background:var(--kk-gradient);padding:50px 0 40px;text-align:center}
.kk-page-header h1{font-size:2rem;margin-bottom:12px}
.kk-brand-highlight{color:var(--kk-secondary)}
.kk-breadcrumb{font-size:.9rem;color:var(--kk-muted)}
.kk-breadcrumb a{color:var(--kk-secondary)}
.kk-page-content{padding:50px 0}
/* 页脚 */
.kk-footer{background:var(--kk-primary);border-top:2px solid var(--kk-secondary);padding:50px 0 0}
.kk-footer-grid{display:grid;grid-template-columns:1.5fr 2fr 1fr;gap:30px;margin-bottom:30px}
.kk-footer-brand p{color:var(--kk-muted);font-size:.9rem;margin-top:10px;line-height:1.7}
.kk-footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.kk-footer-links h5{color:var(--kk-secondary);margin-bottom:14px;font-size:.95rem}
.kk-footer-links a{display:block;color:var(--kk-muted);font-size:.85rem;padding:3px 0;transition:color .3s}
.kk-footer-links a:hover{color:var(--kk-secondary)}
.kk-footer-contact h5{color:var(--kk-secondary);margin-bottom:14px;font-size:.95rem}
.kk-footer-contact p{color:var(--kk-muted);font-size:.85rem;padding:3px 0}
.kk-footer-bottom{border-top:1px solid var(--kk-border);padding:18px 0;text-align:center;color:var(--kk-muted);font-size:.85rem}
.kk-footer-bottom p{margin:3px 0}
/* 社交分享 */
.kk-share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin:20px 0}
.kk-share-btn{padding:8px 18px;border-radius:20px;font-size:.85rem;color:#fff;transition:opacity .3s;cursor:pointer;border:none}
.kk-share-btn:hover{opacity:.85}
.kk-share-wechat{background:#07c160}
.kk-share-weibo{background:#e6162d}
.kk-share-douyin{background:#161823}
.kk-share-bilibili{background:#00a1d6}
/* 响应式 */
@media(max-width:1024px){.kk-video-grid{grid-template-columns:repeat(2,1fr)}.kk-module-grid{grid-template-columns:repeat(2,1fr)}.kk-expert-grid{grid-template-columns:repeat(2,1fr)}.kk-footer-grid{grid-template-columns:1fr}}
@media(max-width:768px){.kk-nav-menu{display:none;position:absolute;top:68px;left:0;right:0;background:var(--kk-primary);flex-direction:column;padding:16px;border-top:1px solid var(--kk-border)}.kk-nav-menu.active{display:flex}.kk-mobile-toggle{display:block}.kk-hero h1{font-size:1.8rem}.kk-hero h1 .kk-brand-hl{font-size:2.2rem}.kk-video-grid{grid-template-columns:1fr}.kk-module-grid{grid-template-columns:1fr}.kk-expert-grid{grid-template-columns:1fr}.kk-review-grid{grid-template-columns:1fr}.kk-contact-grid{grid-template-columns:1fr}.kk-footer-links{grid-template-columns:1fr}.kk-section{padding:40px 0}}