body{font-family:Inter,Roboto,Arial,sans-serif;margin:0}nav a{margin-right:8px}input{padding:6px;margin:6px 0}button{padding:6px 10px;margin-left:6px}table{border-collapse:collapse;width:100%}td,th{border:1px solid #eee;padding:6px 8px}.badge{display:inline-block;padding:4px 8px;border-radius:12px;color:#fff;font-size:12px}.badge-paid{background:#28a745}.badge-unpaid{background:#6c757d}.badge-partial{background:#ffc107;color:#000}.badge-overdue{background:#dc3545}.spinner{border:4px solid rgba(0,0,0,.08);border-top:4px solid rgba(0,0,0,.5);border-radius:50%;width:36px;height:36px;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{padding:24px;text-align:center;color:#666;border:1px dashed #eee;background:#fbfbfb}@media (max-width: 640px){table,thead,tbody,th,td,tr{display:block}th{display:none}td{border:none;padding:8px 0}}