.payment-header-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 10px; text-align: center; font-size: 0.8rem; color: var(--text-muted); border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.payment-item { display: grid; grid-template-columns: repeat(7, 1fr); align-items: center; background-color: rgba(255,255,255,0.03); border: 1px solid transparent; border-radius: 12px; padding: 14px 16px; margin-bottom: 10px; color: var(--text-primary); transition: all 0.3s cubic-bezier(0.4,0,0.2,1); cursor: pointer; text-align: center; gap: 10px; }
.payment-item:hover { background-color: rgba(255,255,255,0.07); transform: translateY(-2px); box-shadow: 0 4px 15px rgba(0,0,0,0.2); }
.payment-item.selected { border-color: var(--bs-primary); background-color: rgba(13,110,253,0.1); }
.status-paid, .status-unpaid { display: inline-block; padding: 6px 12px; border-radius: 20px; font-size: 0.75rem; font-weight: 600; text-align: center; white-space: nowrap; }
.status-paid { background-color: rgba(25,135,84,0.2); color: #4ade80; border: 1px solid rgba(25,135,84,0.3); }
.status-unpaid { background-color: rgba(220,53,69,0.2); color: #f87171; border: 1px solid rgba(220,53,69,0.3); }
.days-left-critical { color: #ef4444; font-weight: bold; }
.days-left-warning  { color: #fbbf24; font-weight: bold; }
.days-left-normal   { color: #4ade80; font-weight: bold; }
#calculate-btn { background-color: #198754; color: #fff; }
#calculate-btn:hover { background-color: #157347; }
@media (max-width: 768px) {
    .payment-header-grid { display: none !important; }
    .payment-item { display: flex; flex-wrap: wrap; gap: 10px; padding: 16px; text-align: left; }
    .payment-item div { flex: 1 1 100%; min-width: 100%; }
    .payment-item div[data-label]::before { content: attr(data-label) ": "; font-weight: 600; color: var(--text-secondary); display: inline-block; min-width: 120px; }
    .payment-item .payment-status { flex: 1 1 100%; margin-top: 10px; padding-top: 10px; border-top: 1px solid rgba(255,255,255,0.1); }
}