body {
  margin: 0;
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  color: #111;
  background: #fafafa;
}

.container {
  max-width: 700px;
  margin: 0 auto;
  padding: 1.5rem;
}

.header {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid #ddd;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.menu a {
  margin-left: 1rem;
  text-decoration: none;
  color: #111;
}

.section {
  margin-bottom: 2.5rem;
}

h1, h2 {
  font-weight: 600;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.25rem;
  text-decoration: none;
  border: 1px solid #111;
  margin-right: 0.5rem;
}

.primary {
  background: #111;
  color: #fff;
}

.secondary {
  background: transparent;
  color: #111;
}

.form input {
  width: 100%;
  padding: 0.5rem;
  margin-bottom: 1rem;
  border: 1px solid #ccc;
}

.footer {
  border-top: 1px solid #ddd;
  padding: 1rem 0;
  text-align: center;
}