:root {
  color-scheme: dark;
  --navy: #07182a;
  --panel: #0d2f4c;
  --text: #eaf7f8;
  --muted: #b7ced4;
  --teal: #22e4d4;
  --line: #1c4a62;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(circle at 80% 5%, #0e4660 0, var(--navy) 35rem);
  color: var(--text);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", sans-serif;
}

header, main, footer { width: min(900px, calc(100% - 40px)); margin: auto; }
header { display: flex; align-items: center; gap: 16px; padding: 38px 0 22px; }
header img { width: 58px; height: 58px; border-radius: 14px; }
header a { color: var(--text); text-decoration: none; font-size: 1.2rem; font-weight: 700; }
main { padding: 36px 0 80px; }
h1, h2 { line-height: 1.2; }
h1 { max-width: 760px; margin: 0 0 22px; font-size: clamp(2.25rem, 7vw, 4.5rem); }
h2 { margin-top: 2.4rem; color: var(--teal); }
p, li { color: var(--muted); }
a { color: var(--teal); }
.lead { max-width: 720px; font-size: 1.2rem; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; margin-top: 38px; }
.card { padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: rgb(13 47 76 / 78%); }
.card h2 { margin-top: 0; }
.button { display: inline-block; margin-top: 10px; padding: 11px 17px; border-radius: 999px; background: var(--teal); color: var(--navy); font-weight: 750; text-decoration: none; }
.notice { padding: 18px 22px; border-left: 4px solid var(--teal); background: var(--panel); border-radius: 6px; }
footer { padding: 26px 0 45px; border-top: 1px solid var(--line); color: var(--muted); font-size: .92rem; }
code { color: var(--text); }