:root {
  color: #172033;
  background: #f6f8fb;
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", sans-serif;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

body {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 18px 64px;
}

main {
  padding: clamp(24px, 5vw, 44px);
  border: 1px solid #dce4ee;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 14px 40px rgba(23, 32, 51, .07);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 38px;
  font-size: 14px;
}

.brand {
  color: #172033;
  font-size: 18px;
  font-weight: 800;
  text-decoration: none;
}

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

a {
  color: #2563eb;
}

h1 {
  max-width: 720px;
  margin: 0 0 14px;
  font-size: clamp(32px, 6vw, 48px);
  letter-spacing: -1.5px;
  line-height: 1.1;
}

h2 {
  margin: 34px 0 10px;
  font-size: 22px;
  letter-spacing: -.4px;
}

p,
li {
  color: #536174;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 4px;
  padding: 0 17px;
  border-radius: 9px;
  background: #2563eb;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 6px 14px rgba(37, 99, 235, .2);
}

.note {
  padding: 14px 16px;
  border: 1px solid #cfe0ff;
  border-left: 4px solid #2563eb;
  border-radius: 10px;
  background: #eff6ff;
}

.warning {
  border-color: #f1d59b;
  border-left-color: #b7791f;
  background: #fff8e6;
}

.updated {
  color: #718096;
  font-size: .9rem;
}

footer {
  margin-top: 28px;
  color: #718096;
  font-size: 13px;
  text-align: center;
}

:focus-visible {
  outline: 3px solid rgba(37, 99, 235, .3);
  outline-offset: 3px;
}

@media (max-width: 520px) {
  body {
    padding: 12px 10px 36px;
  }

  main {
    padding: 24px 20px;
    border-radius: 14px;
  }

  nav {
    align-items: flex-start;
    flex-direction: column;
    margin-bottom: 28px;
  }
}