:root{--ink:#1b2430;--muted:#5c6a78;--sky:#1a4f7a;--felt:#f3ece0;--steppe:#d9c4a0;--wolf:#0e1a24;--max:1120px}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Segoe UI","Microsoft YaHei",-apple-system,sans-serif;color:var(--ink);background:var(--felt);line-height:1.65}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.container{width:min(var(--max),calc(100% - 40px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:80;background:var(--sky);color:#e8eef4}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:58px;flex-wrap:wrap}
.brand{font-weight:800;letter-spacing:.16em;font-size:11px;color:#fff}
.nav{display:flex;gap:14px;flex-wrap:wrap;font-size:13px;font-weight:600;color:#c5d4e0}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 16px;border:1px solid var(--sky);font-weight:700;font-size:13px;cursor:pointer;background:transparent;color:var(--sky)}
.btn-fill{background:var(--sky);color:#fff;border-color:var(--sky)}
.site-header .btn{color:#e8eef4;border-color:#b8d4ea}
.site-header .btn-fill{background:#e8eef4;color:var(--sky);border-color:#e8eef4}
.btn-ink{border-color:var(--wolf);color:var(--wolf)}
section{padding:48px 0;scroll-margin-top:64px}
.kicker{display:block;font-size:11px;font-weight:800;letter-spacing:.16em;color:var(--sky);margin-bottom:8px}
.section-head h2{font-size:clamp(20px,2.8vw,30px);line-height:1.25;margin-bottom:10px}
.section-head p{color:var(--muted);max-width:640px}
.footer{padding:48px 0 22px;background:var(--wolf);color:#9aabba}
.footer-grid{display:grid;grid-template-columns:1.3fr .8fr .9fr;gap:24px}
.footer h3,.footer h4{margin-bottom:12px;font-size:16px;color:#fff}
.footer p,.footer a,.footer li{color:#8a9aac;font-size:14px}
.footer ul{list-style:none;display:grid;gap:8px}
.copyright{margin-top:28px;padding-top:16px;border-top:1px solid #2a3a48;font-size:12px}
@media(max-width:720px){.nav{display:none}.footer-grid{grid-template-columns:1fr}}
img[data-src]{min-height:120px;background:#d4c6ae}
.below-fold{content-visibility:auto;contain-intrinsic-size:auto 480px}