* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #f8fafc;
  color: #111827;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
}

main {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 32px;
}

a {
  color: #2563eb;
}

nav a {
  background: #ffffff;
  border: 1px solid #dbe3ef;
  border-radius: 8px;
  color: #1f2937;
  padding: 10px 12px;
  text-decoration: none;
}

section {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  margin: 16px 0;
  padding: 20px;
}

h1 {
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.1;
  margin: 0 0 8px;
}

h2 {
  font-size: 22px;
  margin: 0 0 12px;
}

h3 {
  font-size: 18px;
  margin: 20px 0 8px;
}

p {
  margin: 0 0 12px;
}

ul {
  margin: 0 0 12px;
  padding-left: 22px;
}

.muted {
  color: #64748b;
}

.notice {
  background: #fff7ed;
  border-color: #fed7aa;
}

.footer {
  color: #64748b;
  font-size: 14px;
  margin-top: 28px;
}