:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  color: #10243a;
  background: #eff7fb;
}

* { box-sizing: border-box; }
body { margin: 0; line-height: 1.65; }
header {
  color: white;
  background: linear-gradient(135deg, #052b49, #087ba5);
  padding: 48px 20px 40px;
}
header div, main { width: min(880px, 100%); margin: 0 auto; }
h1 { margin: 0 0 8px; font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { color: #075d7b; margin-top: 34px; }
h3 { color: #0a6f91; margin-top: 26px; }
p, li { max-width: 78ch; }
nav { margin-top: 20px; }
nav a {
  display: inline-block;
  color: white;
  border: 1px solid #8ed9ec;
  border-radius: 999px;
  padding: 6px 12px;
  margin: 0 6px 6px 0;
  text-decoration: none;
}
main { padding: 26px 20px 70px; }
article {
  background: white;
  border: 1px solid #d7e8ef;
  border-radius: 20px;
  box-shadow: 0 12px 36px rgba(16, 60, 84, .08);
  margin: 26px 0;
  padding: clamp(22px, 5vw, 44px);
}
a { color: #086d91; }
.meta { color: #d9f4fb; }
.note {
  background: #eef9fc;
  border-left: 4px solid #0b87ad;
  padding: 12px 16px;
}
footer { text-align: center; color: #547083; padding: 0 20px 40px; }