/* ============================================
   搜同网 原创样式表
   配色：赛车橙红 #E8450E | 深夜蓝黑 #1B1F3B | 金属金 #FFD700
   ============================================ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --kk-primary:#E8450E;
  --kk-secondary:#1B1F3B;
  --kk-accent:#FFD700;
  --kk-bg:#0D0F1A;
  --kk-card:#161A35;
  --kk-card-hover:#1E2347;
  --kk-text:#F0F0F5;
  --kk-text-sub:#9CA3AF;
  --kk-border:#2A2F52;
  --kk-radius:12px;
  --kk-shadow:0 4px 24px rgba(0,0,0,.4);
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:var(--kk-bg);color:var(--kk-text);line-height:1.7;overflow-x:hidden}
a{color:var(--kk-primary);text-decoration:none;transition:color .25s}
a:hover{color:var(--kk-accent)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.kk-wrap{max-width:1280px;margin:0 auto;padding:0 20px}

/* ---- Header ---- */
.kk-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(13,15,26,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--kk-border);transition:background .3s}
.kk-header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;max-width:1280px;margin:0 auto;padding:0 20px}
.kk-logo{display:flex;align-items:center;gap:10px}
.kk-logo img{height:42px;width:auto}
.kk-logo-text{font-size:1.35rem;font-weight:800;color:var(--kk-text);letter-spacing:1px}
.kk-logo-text span{color:var(--kk-primary)}
.kk-nav{display:flex;align-items:center;gap:28px}
.kk-nav a{color:var(--kk-text-sub);font-size:.95rem;font-weight:500;padding:6px 0;position:relative;transition:color .25s}
.kk-nav a::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:var(--kk-primary);transition:width .3s}
.kk-nav a:hover,.kk-nav a.active{color:var(--kk-text)}
.kk-nav a:hover::after,.kk-nav a.active::after{width:100%}
.kk-search-box{display:flex;align-items:center;background:var(--kk-card);border:1px solid var(--kk-border);border-radius:24px;padding:0 4px 0 14px;height:38px;width:220px;transition:border-color .3s}
.kk-search-box:focus-within{border-color:var(--kk-primary)}
.kk-search-box input{background:transparent;border:none;outline:none;color:var(--kk-text);font-size:.88rem;width:100%;height:100%}
.kk-search-box input::placeholder{color:var(--kk-text-sub)}
.kk-search-box button{background:var(--kk-primary);border:none;color:#fff;width:30px;height:30px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .25s}
.kk-search-box button:hover{background:#ff5722}
.kk-mobile-toggle{display:none;background:none;border:none;color:var(--kk-text);font-size:1.5rem;cursor:pointer}

/* ---- Hero ---- */
.kk-hero{position:relative;height:520px;margin-top:68px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.kk-hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.55)}
.kk-hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,15,26,.3) 0%,rgba(13,15,26,.85) 100%)}
.kk-hero-content{position:relative;z-index:2;text-align:center;max-width:780px;padding:0 20px}
.kk-hero-content h1{font-size:2.8rem;font-weight:900;margin-bottom:16px;line-height:1.3}
.kk-hero-content h1 span{color:var(--kk-primary)}
.kk-hero-content p{font-size:1.1rem;color:var(--kk-text-sub);margin-bottom:28px;line-height:1.8}
.kk-hero-tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.kk-hero-tags span{background:rgba(232,69,14,.15);color:var(--kk-primary);padding:6px 16px;border-radius:20px;font-size:.85rem;border:1px solid rgba(232,69,14,.3)}

/* ---- Section ---- */
.kk-section{padding:70px 0}
.kk-section-head{text-align:center;margin-bottom:48px}
.kk-section-head h2{font-size:2rem;font-weight:800;margin-bottom:10px}
.kk-section-head h2 span{color:var(--kk-primary)}
.kk-section-head p{color:var(--kk-text-sub);font-size:1rem;max-width:600px;margin:0 auto}

/* ---- Video Grid ---- */
.kk-video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.kk-video-card{background:var(--kk-card);border-radius:var(--kk-radius);overflow:hidden;transition:transform .3s,box-shadow .3s;cursor:pointer}
.kk-video-card:hover{transform:translateY(-6px);box-shadow:var(--kk-shadow)}
.kk-video-thumb{position:relative;padding-top:56.25%;overflow:hidden}
.kk-video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.kk-video-card:hover .kk-video-thumb img{transform:scale(1.08)}
.kk-video-play{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;background:rgba(0,0,0,.35)}
.kk-video-card:hover .kk-video-play{opacity:1}
.kk-video-play svg{width:52px;height:52px;fill:var(--kk-primary);filter:drop-shadow(0 2px 8px rgba(0,0,0,.5))}
.kk-video-dur{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}
.kk-video-info{padding:14px 16px}
.kk-video-info h3{font-size:.95rem;font-weight:600;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.4}
.kk-video-meta{display:flex;align-items:center;gap:14px;color:var(--kk-text-sub);font-size:.8rem}
.kk-video-meta span{display:flex;align-items:center;gap:4px}
.kk-video-tags{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
.kk-video-tags span{background:rgba(232,69,14,.1);color:var(--kk-primary);padding:2px 10px;border-radius:12px;font-size:.72rem}

/* ---- Category Grid ---- */
.kk-cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.kk-cat-card{position:relative;border-radius:var(--kk-radius);overflow:hidden;height:200px;cursor:pointer}
.kk-cat-card img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.kk-cat-card:hover img{transform:scale(1.1)}
.kk-cat-overlay{position:absolute;inset:0;background:linear-gradient(180deg,transparent 30%,rgba(13,15,26,.85) 100%);display:flex;flex-direction:column;justify-content:flex-end;padding:20px}
.kk-cat-overlay h3{font-size:1.15rem;font-weight:700;margin-bottom:4px}
.kk-cat-overlay p{color:var(--kk-text-sub);font-size:.82rem}

/* ---- AI Section ---- */
.kk-ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.kk-ai-card{background:var(--kk-card);border-radius:var(--kk-radius);padding:32px 24px;text-align:center;border:1px solid var(--kk-border);transition:border-color .3s,transform .3s}
.kk-ai-card:hover{border-color:var(--kk-primary);transform:translateY(-4px)}
.kk-ai-icon{width:64px;height:64px;margin:0 auto 18px;background:rgba(232,69,14,.12);border-radius:50%;display:flex;align-items:center;justify-content:center}
.kk-ai-icon svg{width:32px;height:32px;fill:var(--kk-primary)}
.kk-ai-card h3{font-size:1.1rem;font-weight:700;margin-bottom:10px}
.kk-ai-card p{color:var(--kk-text-sub);font-size:.88rem;line-height:1.6}

/* ---- Community ---- */
.kk-comm-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.kk-comm-card{background:var(--kk-card);border-radius:var(--kk-radius);padding:28px;border:1px solid var(--kk-border);transition:border-color .3s}
.kk-comm-card:hover{border-color:var(--kk-accent)}
.kk-comm-card h3{font-size:1.05rem;font-weight:700;margin-bottom:8px;display:flex;align-items:center;gap:8px}
.kk-comm-card h3 span{color:var(--kk-accent);font-size:1.2rem}
.kk-comm-card p{color:var(--kk-text-sub);font-size:.88rem;line-height:1.6}
.kk-comm-stats{display:flex;gap:18px;margin-top:12px}
.kk-comm-stats span{font-size:.78rem;color:var(--kk-text-sub)}
.kk-comm-stats strong{color:var(--kk-primary)}

/* ---- Expert ---- */
.kk-expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.kk-expert-card{background:var(--kk-card);border-radius:var(--kk-radius);overflow:hidden;text-align:center;border:1px solid var(--kk-border);transition:transform .3s}
.kk-expert-card:hover{transform:translateY(-4px)}
.kk-expert-photo{width:100%;height:200px;object-fit:cover}
.kk-expert-info{padding:18px 16px}
.kk-expert-info h3{font-size:1rem;font-weight:700;margin-bottom:4px}
.kk-expert-info .kk-expert-role{color:var(--kk-primary);font-size:.82rem;margin-bottom:8px}
.kk-expert-info p{color:var(--kk-text-sub);font-size:.82rem;line-height:1.5;margin-bottom:12px}
.kk-expert-btns{display:flex;gap:8px;justify-content:center}
.kk-btn{display:inline-flex;align-items:center;justify-content:center;padding:8px 20px;border-radius:24px;font-size:.85rem;font-weight:600;cursor:pointer;transition:all .25s;border:none}
.kk-btn-primary{background:var(--kk-primary);color:#fff}
.kk-btn-primary:hover{background:#ff5722;color:#fff}
.kk-btn-outline{background:transparent;color:var(--kk-text);border:1px solid var(--kk-border)}
.kk-btn-outline:hover{border-color:var(--kk-primary);color:var(--kk-primary)}
.kk-btn-gold{background:var(--kk-accent);color:var(--kk-secondary)}
.kk-btn-gold:hover{background:#ffe033}

/* ---- Partner Wall ---- */
.kk-partner-wall{display:flex;flex-wrap:wrap;gap:18px;justify-content:center;align-items:center}
.kk-partner-item{background:var(--kk-card);border:1px solid var(--kk-border);border-radius:10px;padding:16px 28px;font-size:.95rem;font-weight:600;color:var(--kk-text-sub);transition:border-color .3s}
.kk-partner-item:hover{border-color:var(--kk-primary);color:var(--kk-text)}

/* ---- How-To ---- */
.kk-howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-bottom:48px}
.kk-howto-step{background:var(--kk-card);border-radius:var(--kk-radius);padding:28px 20px;text-align:center;border:1px solid var(--kk-border);position:relative}
.kk-howto-num{width:44px;height:44px;background:var(--kk-primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:800;margin:0 auto 14px}
.kk-howto-step h3{font-size:1rem;font-weight:700;margin-bottom:8px}
.kk-howto-step p{color:var(--kk-text-sub);font-size:.85rem;line-height:1.5}

/* ---- FAQ ---- */
.kk-faq-list{max-width:800px;margin:0 auto}
.kk-faq-item{background:var(--kk-card);border:1px solid var(--kk-border);border-radius:var(--kk-radius);margin-bottom:12px;overflow:hidden}
.kk-faq-q{padding:18px 22px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.95rem;transition:color .25s}
.kk-faq-q:hover{color:var(--kk-primary)}
.kk-faq-q::after{content:'+';font-size:1.3rem;color:var(--kk-primary);transition:transform .3s}
.kk-faq-item.active .kk-faq-q::after{transform:rotate(45deg)}
.kk-faq-a{padding:0 22px;max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;color:var(--kk-text-sub);font-size:.9rem;line-height:1.7}
.kk-faq-item.active .kk-faq-a{max-height:300px;padding:0 22px 18px}

/* ---- Reviews ---- */
.kk-review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.kk-review-card{background:var(--kk-card);border-radius:var(--kk-radius);padding:24px;border:1px solid var(--kk-border)}
.kk-review-header{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.kk-review-avatar{width:44px;height:44px;border-radius:50%;background:var(--kk-primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem;flex-shrink:0}
.kk-review-name{font-weight:600;font-size:.92rem}
.kk-review-date{color:var(--kk-text-sub);font-size:.78rem}
.kk-review-stars{color:var(--kk-accent);font-size:.9rem;margin-bottom:10px;letter-spacing:2px}
.kk-review-text{color:var(--kk-text-sub);font-size:.88rem;line-height:1.6}

/* ---- Contact ---- */
.kk-contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start}
.kk-contact-info{display:flex;flex-direction:column;gap:18px}
.kk-contact-row{display:flex;align-items:flex-start;gap:14px}
.kk-contact-row .kk-ci-icon{width:40px;height:40px;background:rgba(232,69,14,.12);border-radius:10px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.kk-contact-row .kk-ci-icon svg{width:20px;height:20px;fill:var(--kk-primary)}
.kk-contact-row h4{font-size:.92rem;font-weight:600;margin-bottom:2px}
.kk-contact-row p{color:var(--kk-text-sub);font-size:.85rem}
.kk-qrcode-wrap{display:flex;gap:24px}
.kk-qrcode-item{text-align:center}
.kk-qrcode-item img{width:150px;height:150px;border-radius:10px;margin-bottom:8px}
.kk-qrcode-item p{font-size:.82rem;color:var(--kk-text-sub)}

/* ---- Share Bar ---- */
.kk-share-bar{display:flex;gap:12px;justify-content:center;padding:24px 0}
.kk-share-btn{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;border:1px solid var(--kk-border);color:var(--kk-text-sub);font-size:1.1rem;transition:all .25s;cursor:pointer;background:var(--kk-card)}
.kk-share-btn:hover{border-color:var(--kk-primary);color:var(--kk-primary);background:rgba(232,69,14,.1)}

/* ---- Footer ---- */
.kk-footer{background:var(--kk-secondary);border-top:1px solid var(--kk-border);padding:48px 0 0}
.kk-footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:36px;margin-bottom:36px}
.kk-footer-brand h3{font-size:1.2rem;font-weight:800;margin-bottom:10px}
.kk-footer-brand h3 span{color:var(--kk-primary)}
.kk-footer-brand p{color:var(--kk-text-sub);font-size:.85rem;line-height:1.6;margin-bottom:14px}
.kk-footer-col h4{font-size:.95rem;font-weight:700;margin-bottom:14px;color:var(--kk-text)}
.kk-footer-col a{display:block;color:var(--kk-text-sub);font-size:.85rem;padding:4px 0;transition:color .25s}
.kk-footer-col a:hover{color:var(--kk-primary)}
.kk-footer-bottom{border-top:1px solid var(--kk-border);padding:20px 0;text-align:center;color:var(--kk-text-sub);font-size:.82rem}
.kk-footer-bottom a{color:var(--kk-primary)}
.kk-update-time{color:var(--kk-text-sub);font-size:.8rem;margin-top:6px}

/* ---- Breadcrumb ---- */
.kk-breadcrumb{padding:14px 0;font-size:.85rem;color:var(--kk-text-sub);margin-top:68px}
.kk-breadcrumb a{color:var(--kk-text-sub)}
.kk-breadcrumb a:hover{color:var(--kk-primary)}
.kk-breadcrumb span{margin:0 8px;color:var(--kk-border)}

/* ---- Page Hero ---- */
.kk-page-hero{background:var(--kk-card);padding:48px 0;text-align:center;margin-bottom:36px}
.kk-page-hero h1{font-size:2rem;font-weight:800;margin-bottom:10px}
.kk-page-hero h1 span{color:var(--kk-primary)}
.kk-page-hero p{color:var(--kk-text-sub);font-size:1rem}

/* ---- EEAT Block ---- */
.kk-eeat-block{background:linear-gradient(135deg,rgba(232,69,14,.08),rgba(255,215,0,.06));border:1px solid rgba(232,69,14,.2);border-radius:var(--kk-radius);padding:28px;margin:36px 0}
.kk-eeat-block h3{font-size:1.05rem;font-weight:700;margin-bottom:10px;color:var(--kk-accent)}
.kk-eeat-block p{color:var(--kk-text-sub);font-size:.88rem;line-height:1.7}

/* ---- Animations ---- */
.kk-animate{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.kk-animate.visible{opacity:1;transform:translateY(0)}
.kk-delay-1{transition-delay:.1s}
.kk-delay-2{transition-delay:.2s}
.kk-delay-3{transition-delay:.3s}
.kk-delay-4{transition-delay:.4s}

/* ---- Responsive ---- */
@media(max-width:1024px){
  .kk-video-grid{grid-template-columns:repeat(3,1fr)}
  .kk-expert-grid{grid-template-columns:repeat(2,1fr)}
  .kk-footer-grid{grid-template-columns:1fr 1fr}
  .kk-howto-steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .kk-nav{display:none;position:fixed;top:68px;left:0;width:100%;background:rgba(13,15,26,.98);flex-direction:column;padding:20px;gap:16px;border-bottom:1px solid var(--kk-border)}
  .kk-nav.open{display:flex}
  .kk-mobile-toggle{display:block}
  .kk-search-box{width:160px}
  .kk-hero{height:400px}
  .kk-hero-content h1{font-size:1.8rem}
  .kk-video-grid{grid-template-columns:repeat(2,1fr)}
  .kk-cat-grid{grid-template-columns:1fr}
  .kk-ai-grid{grid-template-columns:1fr}
  .kk-comm-grid{grid-template-columns:1fr}
  .kk-expert-grid{grid-template-columns:repeat(2,1fr)}
  .kk-review-grid{grid-template-columns:1fr}
  .kk-contact-grid{grid-template-columns:1fr}
  .kk-footer-grid{grid-template-columns:1fr}
  .kk-howto-steps{grid-template-columns:1fr}
  .kk-section{padding:48px 0}
  .kk-section-head h2{font-size:1.5rem}
}
@media(max-width:480px){
  .kk-video-grid{grid-template-columns:1fr}
  .kk-expert-grid{grid-template-columns:1fr}
  .kk-hero{height:320px}
  .kk-hero-content h1{font-size:1.5rem}
}