.billing-modal {
  border: none;
  padding: 0;
  max-width: min(480px, calc(100vw - 32px));
  width: 100%;
  background: transparent;
  overflow: visible;
}

.billing-modal::backdrop {
  background: rgba(10, 22, 40, 0.55);
  backdrop-filter: blur(6px);
}

.billing-modal-inner {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 28px 24px;
  box-shadow: var(--shadow-lg);
}

.billing-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: var(--bg);
  color: var(--text-secondary);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.billing-close:hover {
  background: var(--accent-soft);
  color: var(--corporate);
}

.billing-badge {
  display: inline-block;
  margin-bottom: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--envelope-soft);
  color: var(--envelope);
  font-family: var(--font-label);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.billing-header h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.45rem;
  color: var(--corporate);
}

.billing-subtitle {
  margin: 0 0 20px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.billing-summary {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 20px;
}

.billing-summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding: 4px 0;
}

.billing-summary-row strong {
  color: var(--text);
  font-family: var(--font-label);
  font-weight: 600;
}

.billing-summary-total {
  margin-top: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.billing-summary-total strong {
  font-size: 1.15rem;
  color: var(--corporate);
}

.billing-form {
  display: grid;
  gap: 14px;
}

.billing-form label {
  display: grid;
  gap: 6px;
  font-family: var(--font-label);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
}

.billing-form input {
  padding: 12px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background: var(--paper);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.billing-form input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.billing-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.billing-card-label {
  gap: 8px !important;
}

.billing-card-brands {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 2px;
}

.billing-brand-icon {
  display: inline-flex;
  width: 40px;
  height: 26px;
  border-radius: 4px;
  overflow: hidden;
  opacity: 0.45;
  filter: grayscale(0.35);
  transition: opacity var(--transition), transform var(--transition), filter var(--transition);
}

.billing-brand-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.billing-brand-icon.active {
  opacity: 1;
  filter: none;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.12);
}

.billing-brand-icon.dimmed {
  opacity: 0.25;
}

.billing-card-input-wrap {
  position: relative;
}

.billing-card-input-wrap input {
  width: 100%;
  padding-right: 52px;
}

.billing-card-type {
  position: absolute;
  top: 50%;
  right: 10px;
  transform: translateY(-50%);
  width: 40px;
  height: 26px;
  pointer-events: none;
}

.billing-card-type svg {
  width: 100%;
  height: 100%;
  display: block;
}

.billing-card-hint {
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.billing-card-hint.error {
  color: #dc2626;
}

.billing-demo-note {
  margin: 0;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
}

.billing-submit {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 14px 20px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--envelope), #ff9f2e);
  color: #fff;
  font-family: var(--font-label);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(255, 140, 0, 0.35);
  transition: transform var(--transition), opacity var(--transition);
}

.billing-submit:hover:not(:disabled) {
  transform: translateY(-1px);
}

.billing-submit:disabled {
  opacity: 0.85;
  cursor: wait;
}

.billing-submit-loader {
  display: none;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: billing-spin 0.7s linear infinite;
}

.billing-submit.loading .billing-submit-text {
  visibility: hidden;
}

.billing-submit.loading .billing-submit-loader {
  display: block;
  position: absolute;
}

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

.billing-step-unavailable {
  text-align: center;
  padding: 12px 0 4px;
}

.billing-unavailable-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--envelope), #f59e0b);
  color: #fff;
  font-size: 1.6rem;
  line-height: 64px;
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.3);
}

.billing-step-unavailable h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--corporate);
}

.billing-step-unavailable p {
  margin: 0 0 12px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.55;
}

.billing-contact-link {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
}

.billing-contact-link:hover {
  text-decoration: underline;
}

.billing-unavailable-note {
  font-size: 0.85rem !important;
  margin-bottom: 20px !important;
}

.billing-step-success {
  text-align: center;
  padding: 12px 0 4px;
}

.billing-success-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--success), #14b8a6);
  color: #fff;
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 64px;
  box-shadow: 0 8px 24px rgba(13, 148, 136, 0.35);
  animation: billing-pop 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes billing-pop {
  from { transform: scale(0.5); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.billing-step-success h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--corporate);
}

.billing-step-success p {
  margin: 0 0 20px;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.billing-success-btn {
  padding: 12px 28px;
  border: none;
  border-radius: 999px;
  background: var(--corporate);
  color: #fff;
  font-family: var(--font-label);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}

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

.hidden {
  display: none !important;
}