* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #1a1a1a;
  background: #f7f8fa;
}
.hero {
  text-align: center;
  padding: 4rem 1rem 2rem;
  background: #111;
  color: #fff;
}
.hero h1 { font-size: 2.5rem; margin-bottom: 0.5rem; }
.hero p { font-size: 1.2rem; color: #aaa; }
main {
  max-width: 720px;
  margin: 2rem auto;
  padding: 0 1rem;
}
.features, .cta {
  background: #fff;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}
.features h2, .cta h2 { margin-bottom: 0.75rem; }
.features ul { list-style: disc; padding-left: 1.5rem; }
.button {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.6rem 1.2rem;
  background: #111;
  color: #fff;
  text-decoration: none;
  border-radius: 4px;
}
footer {
  text-align: center;
  padding: 2rem 1rem;
  color: #777;
}