:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f7fa;
  color: #17202a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: #f5f7fa;
  color: #17202a;
  line-height: 1.6;
}

header,
main,
footer {
  width: min(760px, calc(100% - 32px));
  margin-inline: auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0;
}

.brand {
  color: #173f8a;
  font-size: 1.1rem;
  font-weight: 800;
  text-decoration: none;
}

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

nav a,
main a,
footer a {
  color: #174ea6;
}

main {
  background: #fff;
  border: 1px solid #dbe2ea;
  border-radius: 18px;
  box-shadow: 0 8px 28px rgba(25, 47, 78, 0.08);
  padding: clamp(24px, 5vw, 48px);
}

h1 {
  margin: 0 0 8px;
  color: #123a78;
  font-size: clamp(2rem, 7vw, 3rem);
  line-height: 1.1;
}

h2 {
  margin-top: 32px;
  color: #173f8a;
  font-size: 1.25rem;
  line-height: 1.3;
}

.effective {
  margin-top: 0;
  color: #5b6776;
  font-weight: 600;
}

.callout {
  margin: 24px 0;
  border-left: 5px solid #1e65d6;
  border-radius: 10px;
  background: #edf4ff;
  padding: 16px 18px;
}

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

footer {
  padding: 24px 0 40px;
  color: #5b6776;
  font-size: 0.9rem;
}

@media (max-width: 560px) {
  header {
    align-items: flex-start;
    flex-direction: column;
  }

  main { border-radius: 14px; }
}