*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: #0a0a0a;
  color: #f0f0f0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

main {
  text-align: center;
  padding: 2rem;
  max-width: 600px;
}

h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

p {
  font-size: 1.125rem;
  color: #888;
  margin-bottom: 2rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border: 1px solid #333;
  border-radius: 6px;
  color: #f0f0f0;
  text-decoration: none;
  font-size: 0.9rem;
  transition: border-color 0.2s, color 0.2s;
}

.btn:hover {
  border-color: #666;
  color: #fff;
}