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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
}

header {
  padding: 64px 32px 32px;
  text-align: center;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

header .subtitle {
  color: #94a3b8;
  font-size: 1rem;
}

.card-grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  padding: 32px;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

.card {
  display: block;
  background: #1e293b;
  border: 1px solid #334155;
  border-left: 3px solid #fbbf24;
  border-radius: 8px;
  padding: 24px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: #475569;
  border-left-color: #f59e0b;
  background: #283449;
}

.card h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: #f8fafc;
}

.card p {
  color: #94a3b8;
  font-size: 0.875rem;
}

footer {
  padding: 24px 32px;
  text-align: center;
  color: #64748b;
  font-size: 0.75rem;
  border-top: 1px solid #1e293b;
}

@media (max-width: 640px) {
  header { padding: 40px 16px 24px; }
  header h1 { font-size: 1.875rem; }
  .card-grid { padding: 16px; gap: 12px; }
}