* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #222;
  background: #f7f7f7;
  line-height: 1.6;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

header {
  background: #ffffff;
  border-bottom: 1px solid #ddd;
}

header h1 {
  margin: 0;
  font-size: 1.6rem;
  letter-spacing: 0.02em;
}

.subtitle {
  color: #555;
  margin-top: 0.5rem;
}

nav {
  margin-top: 1rem;
}

nav a {
  margin-right: 1.2rem;
  text-decoration: none;
  color: #444;
  font-size: 0.95rem;
}

nav a:hover {
  text-decoration: underline;
}

h2 {
  margin-top: 3rem;
  font-size: 1.2rem;
  border-bottom: 1px solid #ddd;
  padding-bottom: 0.4rem;
}

ul {
  padding-left: 1.2rem;
}

li {
  margin-bottom: 0.5rem;
}

.quiet-note {
  margin-top: 3rem;
  padding: 1.2rem;
  background: #eeeeee;
  font-size: 0.9rem;
  color: #444;
}

footer {
  margin-top: 4rem;
  background: #ffffff;
  border-top: 1px solid #ddd;
}

footer p {
  margin: 0.3rem 0;
  font-size: 0.85rem;
  color: #666;
}

.small {
  font-size: 0.75rem;
  color: #777;
}