:root {
  --surface-page: #f5f6fa;
  --text-primary: #5f636d;
  --text-muted: #b5b7bf;
  --text-error: #c83e4d;
  --text-success: #248a5a;
  --brand-start: #617ee8;
  --brand-end: #7d43a8;
  --focus: #1f66db;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --radius-sm: 0.35rem;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  color: var(--text-primary);
  background: var(--surface-page);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  min-height: 100vh;
  display: grid;
  grid-template-rows: 1fr auto;
  background: var(--surface-page);
}

.payment-page {
  min-width: 0;
}

.payment-action {
  width: min(80%, 64rem);
  margin: var(--space-8) auto 0;
  text-align: center;
}

#payment-help {
  margin: 0 0 var(--space-3);
  color: var(--text-muted);
  font-size: 1.1rem;
}

#random-pay {
  width: 100%;
  min-height: 2.8rem;
  border: 0;
  border-radius: var(--radius-sm);
  color: white;
  background: linear-gradient(100deg, var(--brand-start), var(--brand-end));
  box-shadow: 0 0.15rem 0.4rem rgb(60 69 120 / 12%);
  cursor: pointer;
  font: inherit;
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: filter 120ms ease, transform 120ms ease;
}

#random-pay:hover:not(:disabled) {
  filter: brightness(1.04);
}

#random-pay:active:not(:disabled) {
  transform: translateY(0.06rem);
}

#random-pay:focus-visible,
a:focus-visible {
  outline: 0.2rem solid var(--focus);
  outline-offset: 0.2rem;
}

#random-pay:disabled {
  cursor: wait;
  filter: saturate(0.65) brightness(1.08);
}

#payment-status {
  min-height: 1.5rem;
  margin: var(--space-3) 0 0;
  font-size: 0.9rem;
}

#payment-status[data-state="error"] {
  color: var(--text-error);
}

#payment-status[data-state="success"] {
  color: var(--text-success);
}

@media (max-width: 40rem) {
  .payment-action {
    width: auto;
    margin: 2.5rem var(--space-4) 0;
  }

  #payment-help {
    font-size: 0.95rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

.checkout-body {
  display: block;
}

.checkout-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: var(--space-4);
}

.checkout-card {
  width: min(100%, 30rem);
  padding: var(--space-8);
  border: 1px solid rgb(89 97 123 / 14%);
  border-radius: var(--space-2);
  background: white;
  box-shadow: 0 0.5rem 2rem rgb(52 61 91 / 10%);
}

.checkout-card h1 {
  margin: var(--space-3) 0;
  font-size: 1.5rem;
  color: #343842;
}

.mock-badge {
  display: inline-block;
  margin: 0;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  color: #815300;
  background: #fff1c2;
  font-size: 0.8rem;
  font-weight: 700;
}

.mock-warning {
  margin: 0 0 var(--space-6);
  color: #7c5a14;
  line-height: 1.6;
}

.order-details {
  margin: 0 0 var(--space-6);
}

.order-details div {
  display: grid;
  grid-template-columns: 6rem minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid #eceef3;
}

.order-details dt {
  color: #858995;
}

.order-details dd {
  min-width: 0;
  margin: 0;
  color: #343842;
  overflow-wrap: anywhere;
}

.order-details .checkout-amount {
  color: #c04b38;
  font-size: 1.25rem;
  font-weight: 700;
}

.checkout-error {
  color: var(--text-error);
}

.return-link {
  display: block;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  color: white;
  background: #596fce;
  text-align: center;
  text-decoration: none;
  font-weight: 700;
}

@media (max-width: 30rem) {
  .checkout-card {
    padding: var(--space-6) var(--space-4);
  }

  .order-details div {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }
}