:root {
  --tier-modal-bg: rgba(8, 8, 10, 0.85);
  --tier-modal-panel: #0f0f12;
  --tier-modal-border: rgba(255,255,255,0.08);
  --tier-modal-text: #f5f5f7;
  --tier-modal-muted: #a0a0ad;
  --tier-modal-accent: #e8b76f;
  --tier-modal-success: #30d158;
  --tier-modal-warning: #ffcc00;
}

.tier-modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--tier-modal-bg);
  backdrop-filter: blur(10px);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.tier-modal-overlay.visible {
  display: flex;
}

.tier-modal {
  width: min(720px, 100%);
  background: var(--tier-modal-panel);
  border: 1px solid var(--tier-modal-border);
  border-radius: 24px;
  padding: 2rem;
  color: var(--tier-modal-text);
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 25px 80px rgba(0,0,0,0.55);
  position: relative;
}

.tier-modal--busy {
  opacity: 0.65;
  pointer-events: none;
}

.tier-modal h2 {
  font-family: 'Instrument Serif', Georgia, serif;
  margin-bottom: 0.25rem;
}

.tier-modal__icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.tier-modal__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  border: none;
  background: transparent;
  color: var(--tier-modal-muted);
  font-size: 1.25rem;
  cursor: pointer;
}

.tier-modal__benefits {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.5rem;
  margin: 1.5rem 0;
  padding-left: 0;
}

.tier-modal__benefits li {
  list-style: none;
  padding: 0.25rem 0;
  border: none;
  background: transparent;
  font-size: 0.95rem;
  color: var(--tier-modal-text);
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
}

.tier-modal__benefits li::before {
  content: '•';
  color: var(--tier-modal-accent);
  font-size: 1.25rem;
  line-height: 1;
  margin-top: -2px;
}

.tier-modal__price {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--tier-modal-accent);
}

.tier-modal__timeline {
  border-left: 2px solid rgba(255,255,255,0.08);
  margin: 1rem 0;
  padding-left: 1rem;
}

.tier-modal__timeline li {
  list-style: none;
  margin: 0.5rem 0;
  color: var(--tier-modal-muted);
}

.tier-modal__form .form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--tier-modal-border);
  color: var(--tier-modal-text);
  border-radius: 12px;
  margin-bottom: 1rem;
}

.tier-modal__billing {
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--tier-modal-border);
}

.tier-modal__billing-options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.tier-modal__billing .form-check {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  margin: 0;
}

.tier-modal__billing .form-check-input {
  margin-top: 0.4rem;
  background: transparent;
  border-color: var(--tier-modal-border);
}

.tier-modal__billing .form-check span {
  font-size: 0.95rem;
  color: var(--tier-modal-text);
}

.tier-modal__form label {
  font-size: 0.85rem;
  color: var(--tier-modal-muted);
  margin-bottom: 0.35rem;
}

.tier-modal__checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.tier-modal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.tier-modal__actions .btn-primary {
  flex: 1;
  min-width: 180px;
}

.tier-modal__actions .btn-secondary {
  flex: 1;
  min-width: 160px;
  background: transparent;
  border: 1px solid var(--tier-modal-border);
  color: var(--tier-modal-text);
}

.tier-modal .micro-copy {
  font-size: 0.85rem;
  color: var(--tier-modal-muted);
  margin-top: 0.5rem;
}

.tier-modal__success {
  text-align: center;
}

.tier-modal__success-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: var(--tier-modal-success);
}

.tier-modal__tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  border: 1px solid var(--tier-modal-border);
  color: var(--tier-modal-muted);
}

.tier-modal__alert {
  padding: 1rem;
  border-radius: 16px;
  background: rgba(255, 193, 7, 0.08);
  border: 1px solid rgba(255, 193, 7, 0.2);
  margin-bottom: 1rem;
}

.tier-modal__alert h4 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.tier-modal__secondary {
  background: rgba(255,255,255,0.03);
  border-radius: 16px;
  padding: 1.25rem;
  margin-top: 1.25rem;
}

.tier-modal__secondary h5 {
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.tier-modal__cta-link {
  color: var(--tier-modal-accent);
  text-decoration: none;
}

@media (max-width: 600px) {
  .tier-modal {
    padding: 1.5rem;
    border-radius: 18px;
  }
  .tier-modal__actions {
    flex-direction: column;
  }
}