:root{--bg:#07070a;--card:#101016;--line:#22222c;--text:#ececf2;--muted:#9a9aa8;--accent:#04cfdc}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:radial-gradient(900px 400px at 50% -120px,rgba(4,207,220,.14),transparent),var(--bg);color:var(--text);font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}
.top{max-width:760px;margin:0 auto;padding:22px 20px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-weight:700;letter-spacing:.14em;font-size:15px}
.brand img{width:30px;height:30px;border-radius:8px}
.nav a{color:var(--muted);text-decoration:none;font-size:14px;margin-left:18px}
.nav a:hover,.nav a.on{color:var(--accent)}
main{max-width:760px;margin:0 auto;padding:8px 20px 72px}
h1{font-size:clamp(28px,5vw,40px);line-height:1.15;margin:20px 0 8px;letter-spacing:-.02em}
.sub{color:var(--muted);margin:0 0 28px;font-size:15px}
section,.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px 22px;margin:14px 0}
h2{font-size:17px;margin:0 0 8px;color:var(--accent);font-weight:650}
p,li{color:#c8c8d3;margin:6px 0}
ul,ol{padding-left:22px;margin:6px 0}
b{color:var(--text)}
a{color:var(--accent);text-underline-offset:3px}
.lang{display:inline-block;margin:34px 0 4px;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
h1.en{font-size:clamp(22px,4vw,28px);margin-top:6px}
footer{max-width:760px;margin:0 auto;padding:0 20px 48px;color:var(--muted);font-size:13px;border-top:1px solid var(--line);padding-top:22px}
footer a{color:var(--muted)}
@media(max-width:520px){section,.card{padding:16px}}