body {
  font-family: system-ui, sans-serif;
  background: #f4f6f8;
  color: #222;
  margin: 0;
}

header {
  background: #1f2937;
  color: white;
  padding: 2rem;
}

section {
  padding: 2rem;
  max-width: 900px;
  margin: auto;
}

h1, h2 {
  margin-bottom: 0.5rem;
}

ul {
  list-style: square;
  margin-left: 1.5rem;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.2rem;
  background: #2563eb;
  color: white;
  text-decoration: none;
  border-radius: 6px;
}

footer {
  text-align: center;
  padding: 2rem;
  background: #e5e7eb;
}

.social a {
  margin: 0 1rem;
  text-decoration: none;
  font-weight: bold;
}