:root { --bg:#0b1220; --card:#111a2b; --text:#e8edf7; --muted:#9fb1cc; --link:#7dd3fc; }
* { box-sizing:border-box; }
body { margin:0; background:linear-gradient(180deg,#0b1220,#0f1a30); color:var(--text); font:16px/1.7 -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif; }
.container { max-width: 900px; margin: 40px auto; background: rgba(17,26,43,.92); border:1px solid #25324b; border-radius: 14px; padding: 28px; }
h1,h2 { line-height:1.3; }
a { color:var(--link); }
code { background:#0f172a; padding:2px 6px; border-radius:6px; }