/* ═══════════════════════════════════════════════════
   BILLING & RECEIPT PREMIUM STYLES
   ═══════════════════════════════════════════════════ */
.billing-bg {
    background: #F1F5F9; /* Professional medical cool gray */
}

.billing-container {
    padding-top: 140px;
    padding-bottom: 100px;
}

.billing-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--c-obsidian);
    margin-bottom: 3rem;
    letter-spacing: -0.03em;
}

/* Invoice Cards */
.invoice-card {
    background: var(--c-white);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border: 1px solid var(--color-border);
    transition: all 0.3s var(--ease-out-expo);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.invoice-card:hover {
    transform: translateX(8px);
    border-color: var(--c-teal-400);
    box-shadow: var(--shadow-md);
}

.invoice-card.selected {
    border-color: var(--c-teal-500);
    background: var(--c-teal-50);
    box-shadow: var(--shadow-teal);
}

.inv-type {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--c-obsidian);
    margin-bottom: 0.25rem;
}

.inv-meta {
    font-size: 0.85rem;
    color: var(--c-mist);
    display: flex;
    gap: 1rem;
}

.inv-id {
    font-size: 0.75rem;
    color: var(--c-slate);
    margin-top: 0.5rem;
    opacity: 0.7;
}

.amount-value {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--c-obsidian);
}

/* Receipt Modal & Content */
.modal-receipt-details {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    background: #ffffff;
    border: 1px solid var(--color-border);
    padding: 2.5rem;
    border-radius: var(--radius-2xl);
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
}

.receipt-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
}

.receipt-row strong {
    color: var(--c-mist);
    font-weight: 500;
}

.receipt-row span {
    color: var(--c-obsidian);
    font-weight: 600;
}

.receipt-divider {
    border: 0;
    border-top: 1px dashed var(--color-border);
    margin: 0.5rem 0;
}

.clinical-summary {
    background: rgba(0, 184, 158, 0.03);
    border-radius: var(--radius-md);
    padding: 1rem;
    border-left: 3px solid var(--c-teal-400);
}

.modal-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--c-obsidian);
    margin-top: 0.5rem;
}

.payment-value {
    color: var(--c-teal-500);
}

/* Responsive Billing */
@media (max-width: 992px) {
    .billing-columns {
        grid-template-columns: 1fr;
    }
    
    .payment-summary {
        position: static;
        margin-top: 2rem;
    }
}

/* Mobile Money Buttons */
.btn-momo {
  background: white;
  border: 1px solid var(--color-border);
  color: var(--c-obsidian);
  font-size: 0.8rem !important;
  padding: 0.75rem !important;
  border-radius: var(--radius-md) !important;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-mtn:hover, .btn-mtn.active {
  background: #FFCC00 !important;
  border-color: #E6B800 !important;
  color: #000 !important;
}

.btn-orange:hover, .btn-orange.active {
  background: #FF6600 !important;
  border-color: #E65C00 !important;
  color: #fff !important;
}