:root {
  color-scheme: dark;
  --background: #03101f;
  --panel: #08213a;
  --ink: #eaf5ff;
  --muted: #9bb3c7;
  --line: rgba(69, 199, 255, 0.26);
  --link: #62dcff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 90% 0%, rgba(24, 145, 255, 0.18), transparent 28%),
    var(--background);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a { color: var(--link); }

header, main, footer {
  width: min(820px, calc(100% - 40px));
  margin: auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.brand {
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
}

nav { display: flex; flex-wrap: wrap; gap: 14px; }

nav a { font-size: 14px; }

main { padding: 56px 0 40px; }

h1 { font-size: clamp(32px, 7vw, 48px); line-height: 1.1; margin: 0 0 14px; }

h2 { font-size: 21px; margin: 0 0 8px; }

.lead { color: var(--muted); font-size: 18px; margin: 0 0 34px; }

section {
  margin: 18px 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(8, 33, 58, 0.8);
}

p, li { color: var(--muted); }

li + li { margin-top: 8px; }

.notice {
  border-color: rgba(86, 232, 176, 0.35);
  background: rgba(16, 76, 68, 0.36);
}

footer {
  padding: 28px 0 44px;
  color: #7f98ae;
  font-size: 13px;
}

@media (max-width: 620px) {
  header { align-items: flex-start; flex-direction: column; }
  header, main, footer { width: min(100% - 28px, 820px); }
  main { padding-top: 36px; }
}