:root {
  color-scheme: light;
  --bg: #f3f5f7;
  --surface: #ffffff;
  --ink: #15171a;
  --muted: #667085;
  --line: #d8dee6;
  --primary: #f4544c;
  --primary-dark: #cf3830;
  --accent: #138a72;
  --shadow: 0 22px 60px rgba(15, 23, 42, .12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: linear-gradient(135deg, #f8fafc 0%, #eef2f5 48%, #e9eff0 100%);
}

.checkout-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 16px;
}

.checkout-panel {
  width: min(960px, 100%);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 28px;
}

.brand-row {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 24px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  display: inline-grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  background: var(--primary);
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 24px;
}

h2 {
  font-size: 22px;
  line-height: 1.2;
}

.eyebrow,
.label {
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0;
  font-weight: 700;
  color: var(--muted);
}

.muted {
  color: var(--muted);
  line-height: 1.5;
}

.summary-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(220px, .6fr);
  gap: 16px;
  margin-bottom: 16px;
}

.summary-card,
.member-card,
.payment-section,
.card-form,
.payment-result,
.state-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: #fff;
}

.summary-card.strong {
  background: #f8fbfa;
  border-color: #cbdcd6;
}

.member-card,
.payment-section,
.card-form,
.payment-result {
  margin-top: 16px;
}

.member-name {
  font-size: 18px;
  font-weight: 700;
  margin-top: 6px;
}

.payment-methods {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

button,
.ghost-btn,
.primary-btn {
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
  transition: background .2s ease, border-color .2s ease, color .2s ease;
}

.method-btn {
  min-height: 48px;
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
}

.method-btn:hover,
.method-btn.active {
  border-color: var(--primary);
  color: var(--primary);
}

.primary-btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  padding: 0 18px;
  background: var(--primary);
  color: #fff;
}

.primary-btn:hover {
  background: var(--primary-dark);
}

.ghost-btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 12px 0 16px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

input {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  color: var(--ink);
  font: inherit;
}

.state-box {
  min-height: 150px;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
}

.spinner {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 3px solid #e5e7eb;
  border-top-color: var(--primary);
  animation: spin .9s linear infinite;
}

.alert {
  margin-bottom: 16px;
  border: 1px solid #ffc4c0;
  color: #9f211a;
  background: #fff1f0;
  border-radius: 8px;
  padding: 12px 14px;
}

.qr-image {
  width: min(260px, 100%);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 12px 0;
}

.copy-box {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.copy-box textarea {
  width: 100%;
  min-height: 90px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  resize: vertical;
}

.footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 720px) {
  .checkout-panel {
    padding: 20px;
  }

  .summary-grid,
  .payment-methods,
  .form-grid {
    grid-template-columns: 1fr;
  }
}