body {
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
  background: #f7f9fb;
  color: #222;
}
header {
  background: #2c3e50;
  color: #fff;
  padding: 2rem 1rem 1rem 1rem;
  text-align: center;
}
header .subtitle {
  font-size: 1.2rem;
  color: #b8c6d1;
  margin-top: 0.5rem;
}
main {
  max-width: 800px;
  margin: 2rem auto;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 16px rgba(44,62,80,0.08);
  padding: 2rem;
}
h2 {
  color: #2980b9;
  margin-top: 2rem;
}
ul, ol {
  margin-left: 2rem;
}
section {
  margin-bottom: 2rem;
}
footer {
  text-align: center;
  color: #aaa;
  padding: 2rem 0 1rem 0;
  font-size: 0.95rem;
}
a {
  color: #2980b9;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}