:root {
  color-scheme: light;
  --ink: #17365d;
  --muted: #526276;
  --brand: #087f78;
  --brand-dark: #075e59;
  --surface: #ffffff;
  --soft: #eefaf8;
  --line: #cce7e3;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: #fffaf0;
  font: 17px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
header {
  padding: 2.5rem 1.25rem;
  color: white;
  background: linear-gradient(135deg, var(--brand-dark), var(--brand));
}
header div, main, footer { max-width: 820px; margin: auto; }
h1 { margin: 0 0 .4rem; font-size: clamp(2rem, 6vw, 3.1rem); line-height: 1.15; }
h2 { margin-top: 2.1rem; line-height: 1.25; }
a { color: var(--brand-dark); font-weight: 650; }
nav { margin-top: 1.25rem; display: flex; flex-wrap: wrap; gap: .6rem 1rem; }
nav a { color: white; }
main { padding: 2rem 1.25rem 3rem; }
.card {
  margin: 1.4rem 0;
  padding: 1.2rem 1.35rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 8px 24px rgb(23 54 93 / 8%);
}
.notice { background: var(--soft); border-left: 5px solid var(--brand); }
li + li { margin-top: .45rem; }
footer {
  padding: 1.5rem 1.25rem 3rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}
@media (max-width: 520px) {
  body { font-size: 16px; }
  header { padding-top: 2rem; }
}