:root{
  --bg:#0b1220;
  --panel:#111a2b;
  --text:#eef3fb;
  --muted:#aab7ca;
  --accent:#6ea8fe;
  --border:#22314a;
  --max:1080px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Arial, Helvetica, "Microsoft YaHei", "PingFang SC", sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
header{
  border-bottom:1px solid var(--border);
  background:#0d1626;
  position:sticky; top:0; z-index:10;
}
.nav{
  max-width:var(--max);
  margin:auto;
  padding:16px 24px;
  display:flex;
  gap:24px;
  align-items:center;
  justify-content:space-between;
}
.brand{font-weight:700;color:white}
.navlinks{display:flex;gap:18px;flex-wrap:wrap;align-items:center}
.lang-switch{
  background:transparent;
  border:1px solid var(--border);
  color:var(--text);
  border-radius:8px;
  padding:6px 12px;
  cursor:pointer;
  font:inherit;
  font-size:14px;
  line-height:1.2;
}
.lang-switch:hover{
  border-color:var(--accent);
  color:var(--accent);
}
main{max-width:var(--max);margin:auto;padding:56px 24px}
.hero{padding:36px 0 24px}
.hero h1{font-size:42px;line-height:1.15;margin:0 0 18px}
.hero p{font-size:20px;color:var(--muted);max-width:780px}
.card{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:16px;
  padding:28px;
  margin:24px 0;
}
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:16px;
}
h2{margin-top:0}
ul{padding-left:20px}
.badge{
  display:inline-block;
  border:1px solid var(--border);
  border-radius:999px;
  padding:6px 12px;
  margin:4px 6px 4px 0;
  color:var(--muted);
}
footer{
  border-top:1px solid var(--border);
  margin-top:48px;
}
.footer{
  max-width:var(--max);
  margin:auto;
  padding:28px 24px 48px;
  color:var(--muted);
  font-size:14px;
}
.small{color:var(--muted);font-size:14px}
@media (max-width:700px){
  .nav{align-items:flex-start;flex-direction:column}
  .hero h1{font-size:32px}
}