* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  background: radial-gradient(circle at top, #111827, #0b1220 55%, #070b14 100%);
  color: #e5e7eb;
  padding: 24px;
}
.checkout-shell { display: flex; justify-content: center; }
.checkout-card {
  width: min(960px, 100%);
  background: #0f172a;
  border: 1px solid #1f2a3a;
  border-radius: 14px;
  padding: 26px;
  box-shadow: 0 22px 60px rgba(0,0,0,0.35);
}
.checkout-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  gap: 12px;
  flex-wrap: wrap;
}
.brand { color: #93c5fd; font-weight: 700; letter-spacing: 0.06em; font-size: 12px; text-transform: uppercase; }
h1 { margin: 6px 0 8px; font-size: 28px; }
.badge {
  background: rgba(59,130,246,0.2);
  color: #93c5fd;
  border: 1px solid rgba(59,130,246,0.4);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
}
.subtitle { color: #9ca3af; margin-bottom: 16px; }
.checkout-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 24px;
  align-items: start;
}
.checkout-info {
  background: rgba(15,23,42,0.5);
  border: 1px solid #1f2a3a;
  border-radius: 12px;
  padding: 18px;
}
.checkout-form {
  background: rgba(15,23,42,0.6);
  border: 1px solid #1f2a3a;
  border-radius: 12px;
  padding: 18px;
}
h2 { margin: 18px 0 8px; font-size: 18px; }
.trial-callout {
  margin-top: 18px;
  background: rgba(59,130,246,0.12);
  border: 1px solid rgba(59,130,246,0.4);
  border-radius: 12px;
  padding: 14px;
  color: #cbd5f5;
}
.trial-callout strong { display:block; margin-bottom:6px; color:#e5e7eb; }
.trial-button {
  margin-top: 10px;
  background: #22c55e;
  color: #06260f;
  border: none;
  padding: 10px 14px;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
}
.features, .steps {
  margin-left: 18px;
  color: #cbd5f5;
}
.features li, .steps li { margin: 8px 0; }
label { display: block; margin: 10px 0 6px; color: #9ca3af; }
input, select {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #2a3a4f;
  background: #0b1220;
  color: #e5e7eb;
}
button {
  margin-top: 14px;
  padding: 10px 16px;
  background: linear-gradient(135deg, #38bdf8, #3b82f6);
  border: none;
  border-radius: 8px;
  font-weight: 600;
  color: #0b1220;
}
.message { margin: 10px 0; padding: 10px; border-radius: 8px; }
.message.success { background: rgba(16,185,129,0.15); color: #10b981; border:1px solid #10b981; }
.message.info { background: rgba(59,130,246,0.15); color: #60a5fa; border:1px solid #60a5fa; }
.output {
  margin-top: 16px;
  background: #0b1220;
  padding: 12px;
  border-radius: 8px;
  word-break: break-all;
}
.hint { color: #9ca3af; margin-top: 6px; }
@media (max-width: 720px) {
  .checkout-card { padding: 18px; }
  .checkout-grid { grid-template-columns: 1fr; }
  button { width: 100%; }
}