* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background-color: #ffffff;
  color: #1a1a1a;
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto;
  padding: 1.5rem;
}

header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #ddd;
}

h1,
h2,
h3 {
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

h1 {
  font-size: 1.8rem;
  margin-top: 1rem;
}

h2 {
  font-size: 1.3rem;
  margin-top: 2rem;
}

p,
ul,
ol,
address {
  margin-bottom: 1rem;
}

ul,
ol {
  padding-left: 1.5rem;
}

a {
  color: #0050b3;
  text-decoration: underline;
}

a:hover {
  color: #003a80;
}

main {
  margin-bottom: 2rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #ddd;
  font-size: 0.9rem;
  color: #555;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}