body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg-gradient);
  color: var(--text-primary);
}

.checkout-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.checkout-card {
  width: 100%;
  max-width: 520px;
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-blur-strong);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-float);
  animation: cardAppear 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes cardAppear {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.checkout-header h1 {
  margin: 0 0 10px;
  font-size: 2rem;
  letter-spacing: -0.02em;
}

.checkout-header p {
  margin: 0 0 28px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.price-box {
  background: var(--glass-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-soft);
  margin-bottom: 24px;
}

.price-label {
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 600;
}

.price-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.price-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}

.price-amount {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.price-sub {
  margin-top: 6px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.price-meta {
  margin-top: 10px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.checkout-btn {
  width: 100%;
  padding: 16px 20px;
  background: var(--accent-gradient);
  color: white;
  border: none;
  border-radius: var(--radius-pill);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 6px 24px var(--accent-glow);
  transition: all var(--transition-normal);
}

.checkout-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 10px 36px var(--accent-glow);
}

.checkout-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.secure-note {
  margin: 16px 0 28px;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
}

.warning-note {
  margin: -14px 0 20px;
  color: #a54646;
  background: rgba(244, 63, 94, 0.1);
  border: 1px solid rgba(244, 63, 94, 0.25);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-size: 0.85rem;
  text-align: center;
  line-height: 1.45;
}

.back-link {
  display: block;
  text-align: center;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
}

.back-link:hover {
  color: var(--accent);
}

.notice {
  padding: 14px 18px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-size: 0.9rem;
  text-align: center;
}

.notice.success {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

.notice.error {
  background: rgba(244, 63, 94, 0.15);
  color: var(--error);
}

@media (max-width: 520px) {
  .checkout-card {
    padding: 28px;
  }

  .checkout-header h1 {
    font-size: 1.6rem;
  }
}