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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #1a1a1a;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

header {
  padding: 48px 0 32px;
  border-bottom: 1px solid #e5e5e5;
}

header h1 {
  font-size: 24px;
  font-weight: 700;
}

header p {
  margin-top: 4px;
  color: #666;
  font-size: 15px;
}

main {
  flex: 1;
  padding: 32px 0;
}

main p {
  color: #444;
  font-size: 15px;
}

main nav {
  margin-top: 24px;
  display: flex;
  gap: 16px;
}

main nav a {
  color: #2563eb;
  text-decoration: none;
  font-size: 15px;
}

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

h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
}

h3 {
  font-size: 16px;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 8px;
}

main section {
  margin-bottom: 24px;
}

main section p,
main section ul {
  color: #444;
  font-size: 15px;
  margin-bottom: 12px;
}

main section ul {
  padding-left: 24px;
}

main section li {
  margin-bottom: 4px;
}

.back {
  display: inline-block;
  margin-bottom: 24px;
  color: #2563eb;
  text-decoration: none;
  font-size: 14px;
}

.back:hover {
  text-decoration: underline;
}

footer {
  padding: 24px 0;
  border-top: 1px solid #e5e5e5;
}

footer p {
  color: #999;
  font-size: 13px;
}