.billing-builder { margin: 24px 0 36px; padding: 28px; border: 1px solid var(--app-line-strong); border-radius: 16px; background: var(--app-surface); }
.billing-builder-heading h2 { margin: 8px 0; font-size: clamp(22px, 2.5vw, 30px); }
.billing-builder-heading p, .billing-builder-note { color: var(--app-muted); line-height: 1.6; }
.billing-builder fieldset { margin: 20px 0; padding: 0; min-width: 0; border: 0; }
.billing-builder legend { margin-bottom: 12px; font-weight: 700; }
.billing-builder-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.billing-builder-option { display: flex; align-items: center; gap: 12px; min-width: 0; padding: 14px; border: 1px solid var(--app-line-strong); border-radius: 10px; cursor: pointer; }
.billing-builder-option:has(input:checked) { border-color: var(--app-lime); background: var(--app-surface-raised); }
.billing-builder-option:focus-within { outline: 2px solid var(--app-lime); outline-offset: 2px; }
.billing-builder-option input { flex: 0 0 auto; width: 18px; height: 18px; accent-color: var(--app-lime); }
.billing-builder-option span { min-width: 0; flex: 1; overflow-wrap: anywhere; }
.billing-builder-option b { flex: 0 0 auto; font-variant-numeric: tabular-nums; }
.billing-builder-bottom { display: flex; align-items: end; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.billing-builder-summary { display: grid; gap: 7px; font-size: 13px; color: var(--app-muted); }
.billing-builder-summary b, .billing-builder-total { color: var(--app-text); }
.billing-builder-total { font-size: 16px; }
.billing-builder-note { margin: 16px 0 0; font-size: 12px; }
.billing-builder-discount { margin: 0 0 18px; padding: 12px 16px; border: 1px solid var(--app-lime); border-radius: 10px; color: var(--app-text); background: var(--app-surface-raised); }
@media (max-width: 700px) { .billing-builder { padding: 20px; } .billing-builder-grid { grid-template-columns: 1fr; } .billing-builder-bottom .btn { width: 100%; } }