/* ============================================================
   BILLING — page-specific layout helpers
   Active challenge card, upgrade CTA, section spacing.
   ============================================================ */

.billing-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.billing-section:last-child {
  margin-bottom: 0;
}

.billing-section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.billing-section__title {
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
}

.billing-section__subtitle {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.billing-section__action {
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: var(--weight-medium);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.billing-section__action:hover {
  text-decoration: underline;
}

/* Active challenge card */
.active-challenge {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-4);
  align-items: center;
}

@media (max-width: 720px) {
  .active-challenge {
    grid-template-columns: 1fr;
  }
}

.active-challenge__main {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.active-challenge__title-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.active-challenge__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.active-challenge__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  flex-wrap: wrap;
}

.active-challenge__meta-value {
  font-family: var(--font-mono);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
}

.active-challenge__progress-bar {
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--border-subtle);
  overflow: hidden;
  margin-top: var(--space-1);
}

.active-challenge__progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: inherit;
}

.active-challenge__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: stretch;
}

@media (max-width: 720px) {
  .active-challenge__actions {
    flex-direction: row;
  }
}

/* Upgrade card — promotion for next tier */
.upgrade-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--space-5);
  align-items: center;
}

@media (max-width: 900px) {
  .upgrade-card {
    grid-template-columns: 1fr;
  }
}

.upgrade-card__main {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.upgrade-card__eyebrow {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-primary);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.upgrade-card__title {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.upgrade-card__description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-snug);
  max-width: 50ch;
}

.upgrade-card__features {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.upgrade-card__feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.upgrade-card__feature svg {
  width: 14px;
  height: 14px;
  stroke-width: 2.5;
  color: var(--color-success);
  flex-shrink: 0;
  margin-top: 3px;
}

.upgrade-card__feature strong {
  color: var(--text-primary);
  font-weight: var(--weight-semibold);
}

.upgrade-card__cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  align-items: stretch;
  text-align: center;
}

.upgrade-card__price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-1);
}

.upgrade-card__price-value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.upgrade-card__price-detail {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.upgrade-card__cta-helper {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  line-height: var(--leading-snug);
}

/* Empty state for Payouts tab */
.billing-empty {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-5);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  text-align: center;
}

.billing-empty__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
}

.billing-empty__icon svg {
  width: 28px;
  height: 28px;
  stroke-width: 1.5;
}

.billing-empty__title {
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
}

.billing-empty__text {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  line-height: var(--leading-snug);
  max-width: 420px;
}

.billing-empty__cta {
  margin-top: var(--space-2);
}

/* Tab content sections — show all by default; :target hides others */
.tab-section {
  margin-top: var(--space-5);
}

/* Hide non-active tab sections */
.app[data-billing-tab="overview"] .tab-section:not(#overview),
.app[data-billing-tab="charges"] .tab-section:not(#charges),
.app[data-billing-tab="payouts"] .tab-section:not(#payouts),
.app[data-billing-tab="methods"] .tab-section:not(#methods) {
  display: none;
}