body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #0f172a;
  color: #f1f5f9;
}

.container {
  max-width: 900px;
  margin: 4rem auto;
  padding: 1rem;
  text-align: center;
}

h1 {
  font-size: 3rem;
  margin-bottom: 0.5rem;
  color: #38bdf8;
}

p {
  color: #cbd5e1;
  margin-bottom: 2rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.card {
  background-color: #1e293b;
  border-radius: 12px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  transition: transform 0.2s, background-color 0.2s;
}

.card:hover {
  transform: translateY(-5px);
  background-color: #334155;
}

.card h2 {
  margin: 0 0 0.5rem 0;
  color: #facc15;
}

.card p {
  font-size: 0.95rem;
}

.diagnostics {
  margin-top: 3rem;
  padding: 1.5rem;
  background-color: #1e293b;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.diagnostics h2 {
  color: #38bdf8;
  margin-bottom: 1rem;
}

.diag-output p {
  margin: 0.5rem 0;
  font-size: 1rem;
  color: #e2e8f0;
}