* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  font-family: system-ui, Arial, "Segoe UI", sans-serif;
  background: #0f172a; /* slate-900 */
  color: #e2e8f0;      /* slate-200 */
}
.container { max-width: 1100px; margin: 36px auto; padding: 0 16px; }

.header h1 { margin: 0 0 6px; font-size: 2rem; }
.subtitle { margin: 0 0 22px; color: #a5b4fc; } /* indigo-300 */

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
@media (min-width: 820px) {
  .grid { grid-template-columns: 1fr 1fr; }
}

.card {
  background: #111827; /* gray-900 */
  border: 1px solid #1f2937; /* gray-800 */
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.card h2 { margin: 0; font-size: 1.4rem; }
.desc { margin: 0; color: #cbd5e1; }
.bullets { margin: 0; padding-inline-start: 18px; color: #cbd5e1; }
.bullets li { margin: 4px 0; }

.btn {
  align-self: flex-start;
  margin-top: 6px;
  padding: 10px 14px;
  border-radius: 10px;
  background: #4f46e5; /* indigo-600 */
  color: white; text-decoration: none; font-weight: 700;
  transition: transform .06s ease, background .2s ease;
}
.btn:hover { transform: translateY(-2px); background: #6366f1; }

.footer { margin-top: 20px; color: #94a3b8; }
kbd {
  background: #0b1220; border: 1px solid #334155; border-radius: 6px;
  padding: 2px 6px; font-family: ui-monospace, Menlo, Consolas, monospace;
}