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

body {
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: #1a1a1a;
  background: #f8f9fa;
  min-height: 100vh;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
  padding: 1.5rem 2rem;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem;
}

p {
  margin-bottom: 1rem;
  color: #4b5563;
}

section {
  margin-bottom: 2.5rem;
}

section h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #374151;
}

ul {
  list-style: none;
}

section > ul > li {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
}

section > ul > li strong {
  display: block;
  margin-bottom: 0.25rem;
}

section > ul > li ul {
  list-style: disc;
  margin-top: 0.5rem;
  padding-left: 1.25rem;
}

section > ul > li ul li {
  background: none;
  border: none;
  border-radius: 0;
  padding: 0.25rem 0;
  margin-bottom: 0;
  color: #4b5563;
}

.empty {
  color: #9ca3af;
  font-style: italic;
}

footer {
  text-align: center;
  padding: 2rem;
  color: #9ca3af;
  font-size: 0.875rem;
}