:root {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
}

.container {
  max-width: 720px;
  margin: 10vh auto;
  padding: 24px;
  background: rgba(15, 23, 42, 0.7);
  border-radius: 12px;
  border: 1px solid #1e293b;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

h1 {
  margin-top: 0;
  letter-spacing: 0.5px;
}