body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #0f172a;
  color: #f1f5f9;
  line-height: 1.7;
}
header {
  text-align: center;
  background: #1e293b;
  padding: 3rem 1rem 2rem;
}
header h1 {
  font-size: 2.5rem;
  margin: 0;
}
header .tagline {
  font-size: 1.2rem;
  color: #7dd3fc;
}
main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}
h2 {
  font-size: 1.6rem;
  color: #fcd34d;
}
ul {
  padding-left: 1.5rem;
}
a.button {
  display: inline-block;
  padding: 0.75rem 1.25rem;
  margin-top: 1.5rem;
  background: #14b8a6;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
}
a.button:hover {
  background: #0d9488;
}
.center {
  text-align: center;
}
footer {
  text-align: center;
  margin-top: 3rem;
  padding: 2rem 1rem;
  background: #1e293b;
  color: #94a3b8;
  font-size: 0.9rem;
}