body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  color: #333;
  line-height: 1.6;
}

header {
  background: #222;
  color: white;
  text-align: center;
  padding: 2rem 1rem;
}

header h1 {
  margin-bottom: 0.5rem;
}

header a {
  color: #1da1f2;
  text-decoration: none;
}

main {
  padding: 2rem;
  max-width: 800px;
  margin: auto;
  background: white;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

section {
  margin-bottom: 2rem;
}

section h2 {
  border-bottom: 2px solid #1da1f2;
  padding-bottom: 0.3rem;
  margin-bottom: 1rem;
  color: #1da1f2;
}

ul {
  list-style-type: square;
  padding-left: 1.2rem;
}

footer {
  text-align: center;
  padding: 1rem;
  background: #222;
  color: white;
}