:root{
  --bg:#0d2b45;
  --bg-alt:#133b5c;
  --fg:#ffffff;
  --muted:#c7d7e0;
  --accent:#3a86ff;
  --link:#2563eb;
  --border:rgba(255,255,255,.12);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Inter, Arial, sans-serif;
  line-height:1.65;
  color:#12212c;
  background:#f7fafc;
}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:0 16px}
.site-top{
  background:var(--bg);
  color:var(--fg);
}
.site-top .inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:14px;padding:12px 0;
}
.brand{display:flex;align-items:center;gap:12px}
.brand img{height:36px;width:auto;display:block}
.brand .title{font-weight:700;font-size:18px;letter-spacing:.2px}
.langs a{color:var(--muted);margin-left:12px}
.langs a.active{color:#fff;font-weight:600}
.nav{
  background:var(--bg-alt);
  color:var(--fg);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.nav .inner{display:flex;gap:16px;align-items:center;justify-content:space-between}
.nav a{color:#e9f1f7;padding:14px 10px;display:block}
.nav a:hover{background:rgba(255,255,255,.06)}
.nav .menu{display:flex;gap:6px;flex-wrap:wrap}
.nav .toggle{display:none;background:transparent;border:1px solid var(--border);color:#fff;padding:8px 10px;border-radius:8px}
.bottom-nav{
  background:#0f172a;
  color:#e5e7eb;
  border-top:1px solid rgba(255,255,255,.08);
  position:sticky;
  bottom:0;
}
.bottom-nav .inner{
  display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:center;
  padding:10px 0;
  font-size:14px;
}
.bottom-nav a{color:#cbd5e1;padding:8px 8px}
.bottom-nav a:hover{color:#fff}
.hero{padding:40px 0 10px;background:linear-gradient(180deg, #eef6ff 0%, #ffffff 60%)}
.hero h1{margin:10px 0 6px;font-size:28px;letter-spacing:.2px}
.hero p{margin:0;color:#334155}
.card{
  background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:22px;margin:16px 0;
  box-shadow:0 2px 10px rgba(0,0,0,.03)
}
h2{margin:22px 0 8px;font-size:22px}
h3{margin:18px 0 6px;font-size:18px}
ul{padding-left:20px}
footer{
  padding:28px 0;color:#475569;background:#f1f5f9;border-top:1px solid #e2e8f0;margin-top:26px
}
@media (max-width: 860px){
  .nav .menu{display:none;flex-direction:column;background:var(--bg-alt);width:100%}
  .nav .toggle{display:block;margin-left:auto}
  .bottom-nav{position:static}
}