.billing-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 80px;
}

.billing-intro {
  max-width: 680px;
  margin: 0 auto 32px;
  text-align: center;
}

.billing-intro h1 {
  margin: 6px 0 10px;
  font-size: clamp(32px, 5vw, 48px);
}

.billing-intro p {
  color: #64748b;
}

.current-plan-card {
  max-width: 800px;
  margin: 0 auto 36px;
  padding: 24px;
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 8px 30px rgba(15, 23, 42, .06);
}

.billing-label {
  margin: 0 0 5px;
  color: #64748b;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.current-plan-card h2 {
  margin: 0 0 6px;
}

.current-plan-card p {
  margin: 0;
}

.usage-meter {
  height: 10px;
  margin-top: 18px;
  overflow: hidden;
  border-radius: 999px;
  background: #e5e7eb;
}

.usage-bar {
  height: 100%;
  border-radius: inherit;
  background: #4f46e5;
  transition: width .25s ease;
}

.plan-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.plan-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 28px;
  border: 1px solid #e5e7eb;
  border-radius: 20px;
  background: #fff;
}

.plan-card.featured {
  border: 2px solid #6366f1;
}

.plan-badge {
  margin: -12px 0 14px;
  color: #4f46e5;
  font-size: 12px;
  font-weight: 800;
}

.plan-name {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
}

.plan-price {
  margin: 14px 0 18px;
}

.plan-price strong {
  font-size: 40px;
}

.plan-price span {
  color: #64748b;
}

.plan-card ul {
  flex: 1;
  margin: 0 0 24px;
  padding-left: 20px;
  color: #475569;
  line-height: 1.8;
}

.plan-button {
  width: 100%;
  min-height: 44px;
  border: 1px solid #cbd5e1;
  border-radius: 10px;
  background: #fff;
  font-weight: 800;
  cursor: pointer;
}

.plan-button.primary {
  border-color: #4f46e5;
  background: #4f46e5;
  color: #fff;
}

.plan-button:disabled {
  cursor: default;
  opacity: .65;
}

.plan-card.current {
  box-shadow: 0 0 0 3px rgba(79, 70, 229, .14);
}

.credit-guide {
  margin-top: 36px;
  padding: 28px;
  border-radius: 18px;
  background: #f8fafc;
  text-align: center;
}

.credit-guide h2 {
  margin-top: 0;
}

.credit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 22px 0;
}

.credit-grid div {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 18px;
  border-radius: 12px;
  background: #fff;
}

.credit-grid span,
.credit-guide > p {
  color: #64748b;
}

.billing-message {
  min-height: 24px;
  margin-top: 22px;
  text-align: center;
  font-weight: 700;
}

@media (max-width: 760px) {
  .plan-grid,
  .credit-grid {
    grid-template-columns: 1fr;
  }

  .billing-shell {
    padding-top: 32px;
  }
}