:root{--ink: #1a1a1a;--paper: #faf9f7;--line: #e2e0db;--accent: #1a1a1a;--muted: #706c66;--danger: #b3261e;--ok: #1e7a3d;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink)}button{font-family:inherit;cursor:pointer}input,select{font-family:inherit}.app-shell{min-height:100vh;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;border-bottom:1px solid var(--line);background:#fff}.brand{font-weight:700;letter-spacing:.02em;font-size:16px}.nav{display:flex;gap:4px}.nav button{border:none;background:transparent;padding:8px 14px;border-radius:6px;font-size:14px;color:var(--muted)}.nav button.active{background:var(--ink);color:#fff}.logout-btn{border:1px solid var(--line);background:#fff;padding:6px 12px;border-radius:6px;font-size:13px}.content{flex:1;padding:24px;max-width:1200px;width:100%;margin:0 auto}.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px;margin-bottom:18px}.card h3{margin-top:0;font-size:15px}.grid{display:grid;gap:16px}.grid-4{grid-template-columns:repeat(4,1fr)}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}@media (max-width: 900px){.grid-4,.grid-3,.grid-2{grid-template-columns:1fr 1fr}}.stat{font-size:26px;font-weight:700}.stat-label{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.05em}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line)}th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase}th.sortable-th{cursor:pointer;-webkit-user-select:none;user-select:none;white-space:nowrap}th.sortable-th:hover{color:var(--ink)}.btn{border:1px solid var(--ink);background:var(--ink);color:#fff;padding:8px 16px;border-radius:6px;font-size:14px}.btn.secondary{background:#fff;color:var(--ink)}.btn.danger{background:var(--danger);border-color:var(--danger)}.btn:disabled{opacity:.5;cursor:not-allowed}input[type=text],input[type=number],input[type=password],select{padding:8px 10px;border:1px solid var(--line);border-radius:6px;font-size:14px;width:100%}.field{display:flex;flex-direction:column;gap:4px;margin-bottom:10px}.field label{font-size:12px;color:var(--muted)}.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center}.login-card{width:340px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:28px}.error-banner{background:#fdecea;color:var(--danger);padding:10px 14px;border-radius:6px;font-size:13px;margin-bottom:12px}.success-banner{background:#e8f5ea;color:var(--ok);padding:10px 14px;border-radius:6px;font-size:13px;margin-bottom:12px}.tag{display:inline-block;background:#f0efec;border-radius:4px;padding:2px 8px;font-size:12px;margin-right:4px}.low-stock-row td{color:var(--danger)}.pos-layout{display:grid;grid-template-columns:1.4fr 1fr;gap:20px}.cart-row{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px solid var(--line);font-size:14px}.pos-total{font-size:22px;font-weight:700;margin:10px 0}.receipt{font-family:Courier New,monospace;font-size:13px;white-space:pre-wrap}.category-badge{display:inline-block;border-radius:4px;padding:2px 10px;font-size:12px;text-transform:capitalize;font-weight:600;border:1px solid var(--line)}.category-badge.white{background:#fff;color:var(--ink)}.category-badge.red{background:#fdecea;color:var(--danger);border-color:#f3c9c5}.category-badge.black{background:var(--ink);color:#fff}.clickable-row{cursor:pointer}.clickable-row:hover{background:#fbfaf8}.balance-positive{color:var(--danger);font-weight:600}.balance-zero{color:var(--muted)}.return-row td{color:#9c6f00}.invoice-bar{display:flex;justify-content:space-between;align-items:baseline;font-size:13px;color:var(--muted);margin-bottom:10px;padding-bottom:8px;border-bottom:1px solid var(--line)}.invoice-bar strong{color:var(--ink);font-size:15px}.search-dropdown{position:relative}.search-dropdown-list{position:absolute;z-index:50;top:100%;left:0;right:0;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 8px 24px #00000014;max-height:320px;overflow-y:auto;margin-top:4px}.search-dropdown-item{padding:8px 12px;border-bottom:1px solid var(--line);cursor:pointer;font-size:13px}.search-dropdown-item:last-child{border-bottom:none}.search-dropdown-item:hover{background:#fbfaf8}.tender-balance-ok{color:var(--ok);font-weight:700}.tender-balance-off{color:var(--danger);font-weight:700}.calculator-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:10px}.calculator-display{background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:12px;text-align:right;font-size:22px;font-family:Courier New,monospace;margin-bottom:10px;word-break:break-all}