body {
  margin: 0;
  font-family: system-ui;
  background: #0f172a;
  color: #e2e8f0;
}

header {
  text-align: center;
  padding: 2rem;
  border-bottom: 1px solid #334155;
}

.container {
  max-width: 800px;
  margin: auto;
  padding: 2rem;
}

.card {
  background: #1e293b;
  padding: 1.5rem;
  margin-bottom: 1rem;
  border-radius: 10px;
}

a {
  color: #38bdf8;
  text-decoration: none;
}

.back-link {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}