:root{
  --bg:#ffffff;
  --ink:#0f0f0f;
  --muted:#6b6f76;
  --line:rgba(15,15,15,.12);
  --soft:rgba(15,15,15,.06);
  --card:#ffffff;
  --shadow:0 26px 90px rgba(15,15,15,.10);
  --radius:18px;
  --radius2:26px;
  --ease:cubic-bezier(.2,.8,.2,1);
  --container:1180px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,"Noto Sans","Apple Color Emoji","Segoe UI Emoji";
  background:var(--bg);
  color:var(--ink);
  letter-spacing:-.01em;
}
a{color:inherit;text-decoration:none}
.container{max-width:var(--container);margin:0 auto;padding:0 28px}

.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.78);
  backdrop-filter:saturate(140%) blur(14px);
  border-bottom:1px solid transparent;
  transition:transform .35s var(--ease), border-color .35s var(--ease), background .35s var(--ease);
}
.site-header.is-scrolled{border-color:var(--line)}
.site-header.is-hidden{transform:translateY(-100%)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:78px}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#0f0f0f,#2a2a2a);box-shadow:0 14px 40px rgba(0,0,0,.18)}
.brand-logo{width:34px;height:34px;border-radius:10px;object-fit:contain;display:block;background:#fff;padding:6px}
.site-footer .brand-logo{background:rgba(255,255,255,.92)}
.brand-text{font-weight:750;letter-spacing:.14em;font-size:14px}
.nav{display:flex;align-items:center;gap:22px}
.nav-link{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:rgba(15,15,15,.78);position:relative;padding:10px 2px;transition:color .25s var(--ease)}
.nav-link.is-active{color:rgba(15,15,15,1)}
.nav-link:after{content:"";position:absolute;left:0;bottom:4px;width:0;height:1px;background:rgba(15,15,15,.75);transition:width .25s var(--ease)}
.nav-link.is-active:after{width:100%}
.nav-link:hover{color:rgba(15,15,15,1)}
.nav-link:hover:after{width:100%}

.nav-toggle{display:none;align-items:center;justify-content:center;width:42px;height:42px;border-radius:12px;border:1px solid var(--line);background:#fff}
.nav-toggle-line{display:block;width:18px;height:2px;background:var(--ink);margin:2px 0;opacity:.88}

.site-main{min-height:60vh}

.section{padding:78px 0}
.section-title{margin:0;font-size:34px;letter-spacing:-.03em}
.section-text{margin:14px 0 0;color:var(--muted);font-size:16px;line-height:1.8}

.site-footer{padding:58px 0 28px;background:#0f0f0f;color:#fff}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:30px;align-items:start}
.footer-brand{display:flex;align-items:center;gap:12px}
.footer-text{margin-top:14px;color:rgba(255,255,255,.66);line-height:1.7;max-width:420px}
.footer-title{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:rgba(255,255,255,.72);margin-bottom:12px}
.footer-item{color:rgba(255,255,255,.70);line-height:1.9}
.footer-link{display:block;color:rgba(255,255,255,.70);padding:6px 0;transition:color .25s var(--ease)}
.footer-link:hover{color:#fff}
.footer-bottom{margin-top:34px;padding-top:18px;border-top:1px solid rgba(255,255,255,.10);display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}
.muted{color:rgba(255,255,255,.60)}

@media (max-width: 980px){
  .footer-grid{grid-template-columns:1fr;gap:18px}
}
@media (max-width: 720px){
  .container{padding:0 18px}
  .header-inner{height:70px}
  .nav-toggle{display:inline-flex}
  .nav{position:fixed;left:18px;right:18px;top:86px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;display:none;flex-direction:column;gap:4px;box-shadow:var(--shadow)}
  .nav.is-open{display:flex}
  .nav-link{width:100%;padding:12px 10px;border-radius:12px}
  .nav-link:hover{background:rgba(15,15,15,.04)}
}