* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, sans-serif;
  background: #0f1117;
  color: #e6e6e6;
  margin: 0;
  padding: 3rem 1.5rem;
}
main { max-width: 900px; margin: 0 auto; text-align: center; }
h1 { font-size: 2rem; margin-bottom: 0.25rem; }
.subtitle { color: #9aa0ab; margin-bottom: 2.5rem; }
.plans { display: flex; gap: 1.5rem; flex-wrap: wrap; justify-content: center; }
.plan-card {
  background: #1a1d27;
  border: 1px solid #2a2e3a;
  border-radius: 12px;
  padding: 1.75rem;
  width: 240px;
  text-align: left;
}
.plan-card h2 { margin: 0 0 0.5rem; }
.plan-card .price { font-size: 1.6rem; font-weight: 700; margin: 0 0 1rem; }
.plan-card .price span { font-size: 0.9rem; font-weight: 400; color: #9aa0ab; }
.plan-card ul { padding-left: 1.1rem; color: #c4c8d0; margin-bottom: 1.25rem; }
.plan-card button {
  width: 100%;
  padding: 0.65rem;
  border: none;
  border-radius: 8px;
  background: #5865f2;
  color: white;
  font-weight: 600;
  cursor: pointer;
}
.plan-card button:disabled { opacity: 0.6; cursor: default; }
.error { color: #ff6b6b; margin-top: 1.5rem; }