/* 404.css */

.nf{padding:calc(var(--header-h) + 60px) 0 80px;background:linear-gradient(180deg,var(--blue-50),#fff);text-align:center;min-height:70vh}
.nf-code{font-size:clamp(90px,18vw,180px);font-weight:800;line-height:1;background:linear-gradient(135deg,var(--blue-400),var(--blue-700));-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:4px}
.nf h1{margin:10px 0 14px}
.nf-sub{color:var(--gray-600);max-width:520px;margin:0 auto 36px}
.nf-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;max-width:880px;margin:0 auto 40px}
.nf-card{background:#fff;border:1px solid var(--gray-100);border-radius:var(--radius-m);padding:26px 20px;box-shadow:var(--shadow-s);transition:transform var(--trans),box-shadow var(--trans)}
.nf-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-m)}
.nf-card h3{color:var(--blue-700);margin-bottom:8px}
.nf-card p{font-size:13.5px;color:var(--gray-500)}
.nf-search p{color:var(--gray-500);margin-bottom:14px;font-size:14px}

/* 404 长页扩展内容区 */
.nf-faq{background:#fff;text-align:left}
.nf-faq-list{max-width:820px;margin:26px auto 0}
.nf-faq-list details{background:var(--gray-50);border:1px solid var(--gray-100);border-radius:var(--radius-m);margin-bottom:12px;overflow:hidden}
.nf-faq-list summary{cursor:pointer;padding:16px 20px;font-weight:600;color:var(--gray-800);list-style:none;position:relative;padding-right:40px}
.nf-faq-list summary::-webkit-details-marker{display:none}
.nf-faq-list summary::after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);font-size:20px;color:var(--blue-500);transition:transform var(--trans)}
.nf-faq-list details[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.nf-faq-list details p{padding:0 20px 18px;font-size:14px;color:var(--gray-600);line-height:1.8}

.nf-services{background:var(--gray-50)}
.nf-svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:26px}
.nf-svc{background:#fff;border:1px solid var(--gray-100);border-radius:var(--radius-m);padding:26px 22px;box-shadow:var(--shadow-s);transition:transform var(--trans),box-shadow var(--trans)}
.nf-svc:hover{transform:translateY(-4px);box-shadow:var(--shadow-m)}
.nf-svc h3{color:var(--blue-700);margin-bottom:10px}
.nf-svc p{font-size:14px;color:var(--gray-600);line-height:1.7}

.nf-gw{background:#fff}
.nf-gw-link{margin-top:24px}

.nf-contact{background:linear-gradient(120deg,var(--blue-700),var(--blue-500))}
.nf-ct-box{color:#fff;text-align:center;max-width:640px;margin:0 auto}
.nf-ct-box h2{color:#fff;margin-bottom:14px}
.nf-ct-box p{color:#eaf3fb;line-height:1.9;margin-bottom:14px}
.nf-ct-box .btn-light{margin-top:8px}

@media (max-width:720px){
  .nf-grid{grid-template-columns:1fr 1fr}
  .nf-svc-grid{grid-template-columns:1fr}
  .nf-rec-grid{grid-template-columns:1fr}
}

/* 更多推荐页面 */
.nf-rec{background:var(--gray-50)}
.nf-rec-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:26px}
.nf-rec-item{background:#fff;border:1px solid var(--gray-100);border-radius:var(--radius-m);padding:20px 22px;box-shadow:var(--shadow-s);display:block}
.nf-rec-item h3{font-size:15px;color:var(--blue-700);margin-bottom:6px}
.nf-rec-item p{font-size:13.5px;color:var(--gray-600);line-height:1.7}