/* ─── Checkout Modal ─── */
.checkout-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  visibility: hidden;
  pointer-events: none;
}

.checkout-modal--open {
  visibility: visible;
  pointer-events: auto;
}

/* Overlay */
.checkout-modal__overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.checkout-modal--open .checkout-modal__overlay {
  opacity: 1;
}

/* Card */
.checkout-modal__card {
  position: relative;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-xl);
  transform: translateY(24px);
  opacity: 0;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.checkout-modal--open .checkout-modal__card {
  transform: translateY(0);
  opacity: 1;
}

/* Close button */
.checkout-modal__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-gray-400);
  transition: background var(--transition-fast), color var(--transition-fast);
  font-size: 1.25rem;
  line-height: 1;
}

.checkout-modal__close:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-700);
}

/* Header */
.checkout-modal__title {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.checkout-modal__subtitle {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  margin-bottom: var(--space-6);
  line-height: 1.6;
}

/* Form */
.checkout-modal__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.checkout-modal__label {
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-gray-700);
  margin-bottom: var(--space-2);
  display: block;
}

.checkout-modal__input {
  width: 100%;
  padding: 14px var(--space-4);
  font-size: 1rem;
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  font-family: inherit;
  color: var(--color-gray-800);
  background: var(--color-white);
}

.checkout-modal__input::placeholder {
  color: var(--color-gray-400);
}

.checkout-modal__input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(28, 176, 246, 0.15);
}

.checkout-modal__input--error {
  border-color: #EF4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

/* Error message */
.checkout-modal__error[hidden] {
  display: none;
}

.checkout-modal__error {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: #FEF2F2;
  border: 1px solid #FECACA;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: #DC2626;
  line-height: 1.5;
}

.checkout-modal__error-icon {
  flex-shrink: 0;
  font-size: 1rem;
  line-height: 1.5;
}

/* Submit button */
.checkout-modal__submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 14px 32px;
  font-family: 'Poppins', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  background: var(--gradient-cta);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  min-height: 48px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  line-height: 1;
  margin-top: var(--space-2);
}

.checkout-modal__submit:hover {
  transform: translateY(-2px);
  background: var(--gradient-cta-hover);
  box-shadow: 0 6px 20px rgba(255, 75, 157, 0.35);
}

.checkout-modal__submit:active {
  transform: translateY(0);
}

.checkout-modal__submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Secure note */
.checkout-modal__secure {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: 0.75rem;
  color: var(--color-gray-400);
  margin-top: var(--space-2);
}

/* Responsive */
@media (max-width: 480px) {
  .checkout-modal__card {
    padding: var(--space-6);
  }

  .checkout-modal__title {
    font-size: 1.25rem;
  }
}