:root{--ink:#102033;--muted:#5d6d80;--line:#c9d4e0;--soft:#eef4fa;--paper:#f5f8fc;--orbit:#1a3a5c;--blue:#2a6fdb;--amber:#f08a24;--max:1220px}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);line-height:1.65}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.container{width:min(var(--max),calc(100% - 36px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line)}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:14px;min-height:70px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:900}
.brand-mark{width:36px;height:36px;border-radius:50%;border:2px solid var(--orbit);display:grid;place-items:center;font-size:10px}
.nav{display:flex;align-items:center;gap:16px;font-size:13px;font-weight:700;color:var(--muted);flex-wrap:wrap}
.nav a:hover{color:var(--blue)}
.header-actions{display:flex;align-items:center;gap:10px}
.language{font-size:12px;padding:6px 10px;border:1px solid var(--line);border-radius:999px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 18px;border:1px solid transparent;border-radius:999px;font-weight:800;font-size:14px;cursor:pointer}
.btn-blue{background:var(--blue);color:#fff}
.btn-amber{background:var(--amber);color:#fff}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-dark{background:var(--orbit);color:#fff}
section{padding:56px 0;scroll-margin-top:76px}
.section-label{display:inline-block;margin-bottom:8px;color:var(--blue);font-size:12px;font-weight:900;letter-spacing:.12em;text-transform:uppercase}
.section-head h2{font-size:clamp(24px,3.4vw,38px);line-height:1.2;margin-bottom:10px}
.section-head p{color:var(--muted);max-width:640px}
.footer{padding:48px 0 22px;background:var(--orbit);color:#d5e0ec}
.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:#9eb0c3;font-size:14px}
.footer ul{list-style:none;display:grid;gap:8px}
.copyright{margin-top:28px;padding-top:16px;border-top:1px solid #2c5070;font-size:12px;color:#8aa0b5}
@media(max-width:980px){.nav{display:none}.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:720px){.container{width:min(100% - 24px,var(--max))}.footer-grid{grid-template-columns:1fr}}
img[data-src]{min-height:120px;background:rgba(128,128,128,.08)}
.below-fold{content-visibility:auto;contain-intrinsic-size:auto 480px}