.checkout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  gap: 28px;
  align-items: start;
}

.checkout-summary,
.checkout-form-panel {
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 8px;
  background: #ffffff;
  padding: 24px;
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.08);
}

.checkout-price {
  font-size: 38px;
  font-weight: 800;
  margin: 8px 0 16px;
}

.checkout-form-panel label {
  display: grid;
  gap: 6px;
  margin-bottom: 14px;
  font-weight: 700;
}

.checkout-form-panel input {
  width: 100%;
  border: 1px solid rgba(15, 23, 42, 0.2);
  border-radius: 6px;
  padding: 12px 14px;
  font: inherit;
}

.secure-note,
.payment-message {
  border-radius: 8px;
  padding: 14px 16px;
  background: #e8f7fb;
  color: #0f3a45;
  margin-top: 16px;
}

.payment-message[data-kind="gated"] {
  background: #fff7e0;
  color: #533b00;
}

.payment-result-box {
  border-left: 4px solid #00a8c8;
  background: #ffffff;
  padding: 24px;
  border-radius: 8px;
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.08);
}

@media (max-width: 760px) {
  .checkout-shell {
    grid-template-columns: 1fr;
  }
}