:root{--primary: #2563eb;--primary-dark: #1e40af;--success: #16a34a;--danger: #dc2626;--warning: #f59e0b;--bg: #f8fafc;--card: #ffffff;--text: #1e293b;--text-muted: #64748b;--border: #e2e8f0;--radius: 10px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;-webkit-tap-highlight-color:transparent}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;gap:16px}.spinner{width:40px;height:40px;border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}button{cursor:pointer;border:none;border-radius:var(--radius);font-size:16px;font-weight:600;padding:12px 24px;transition:all .15s}button:active{transform:scale(.97)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-success{background:var(--success);color:#fff}.btn-danger{background:var(--danger);color:#fff}.btn-warning{background:var(--warning);color:#fff}.btn-outline{background:transparent;border:2px solid var(--border);color:var(--text)}.btn-outline:hover{border-color:var(--primary);color:var(--primary)}.btn-sm{padding:8px 16px;font-size:14px}.btn-lg{padding:16px 32px;font-size:18px}input,select,textarea{width:100%;padding:12px 16px;border:2px solid var(--border);border-radius:var(--radius);font-size:16px;outline:none;transition:border-color .15s}input:focus,select:focus,textarea:focus{border-color:var(--primary)}.card{background:var(--card);border-radius:var(--radius);padding:24px;box-shadow:0 1px 3px #00000014}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px}.login-card{width:100%;max-width:400px;text-align:center}.login-card h1{font-size:32px;color:var(--primary);margin-bottom:8px}.login-card .subtitle{color:var(--text-muted);margin-bottom:32px}.login-card form{display:flex;flex-direction:column;gap:12px}.login-card .error{color:var(--danger);font-size:14px;min-height:20px}.topbar{background:var(--primary);color:#fff;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}.topbar h2{font-size:18px}.topbar-right{display:flex;align-items:center;gap:12px}.badge{background:#fff3;padding:4px 12px;border-radius:20px;font-size:13px}.tab-bar{display:flex;background:var(--card);border-bottom:2px solid var(--border);overflow-x:auto;-webkit-overflow-scrolling:touch}.tab-btn{flex:1;min-width:80px;padding:14px 8px;background:transparent;color:var(--text-muted);border-radius:0;font-size:14px;font-weight:600;border-bottom:3px solid transparent;white-space:nowrap}.tab-btn.active{color:var(--primary);border-bottom-color:var(--primary)}.page-content{padding:16px;max-width:1200px;margin:0 auto}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;flex-wrap:wrap;gap:12px}.section-header h2{font-size:20px}.grid-2{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}.grid-4{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px}.stat-card{text-align:center;padding:20px}.stat-card h3{font-size:13px;color:var(--text-muted);margin-bottom:8px;text-transform:uppercase}.stat-card .value{font-size:28px;font-weight:700;color:var(--primary)}.stat-card.warning .value{color:var(--warning)}.sell-layout{display:grid;grid-template-columns:1fr 340px;gap:16px;height:calc(100vh - 140px)}@media(max-width:768px){.sell-layout{grid-template-columns:1fr;height:auto}}.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:10px;overflow-y:auto;padding:4px}.product-tile{background:var(--card);border:2px solid var(--border);border-radius:var(--radius);padding:14px 10px;text-align:center;cursor:pointer;transition:all .15s;display:flex;flex-direction:column;gap:6px}.product-tile:hover{border-color:var(--primary)}.product-tile.out-of-stock{opacity:.5;pointer-events:none}.product-tile .name{font-weight:600;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.product-tile .price{color:var(--primary);font-weight:700;font-size:16px}.product-tile .stock{font-size:12px;color:var(--text-muted)}.cart-panel{background:var(--card);border-radius:var(--radius);display:flex;flex-direction:column;height:100%;box-shadow:0 1px 3px #00000014}.cart-header{padding:16px;border-bottom:2px solid var(--border);font-weight:700;font-size:16px}.cart-items{flex:1;overflow-y:auto;padding:8px 16px}.cart-item{display:flex;align-items:center;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--border);gap:8px}.cart-item .item-info{flex:1}.cart-item .item-name{font-weight:600;font-size:14px}.cart-item .item-price{color:var(--text-muted);font-size:13px}.qty-controls{display:flex;align-items:center;gap:8px}.qty-controls button{width:32px;height:32px;padding:0;font-size:18px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--border);color:var(--text)}.cart-footer{padding:16px;border-top:2px solid var(--border)}.cart-total{display:flex;justify-content:space-between;font-size:20px;font-weight:700;margin-bottom:12px}.payment-methods{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:12px}.pay-btn{padding:10px;font-size:13px;background:var(--border);color:var(--text)}.pay-btn.selected{background:var(--primary);color:#fff}.complete-btn{width:100%}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.modal{background:var(--card);border-radius:var(--radius);width:100%;max-width:500px;max-height:90vh;overflow-y:auto}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:2px solid var(--border)}.modal-header h3{font-size:18px}.modal-body{padding:20px}.modal-body form{display:flex;flex-direction:column;gap:12px}.form-group{display:flex;flex-direction:column;gap:4px}.form-group label{font-size:13px;font-weight:600;color:var(--text-muted)}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border)}th{font-size:13px;color:var(--text-muted);text-transform:uppercase;background:var(--bg)}.table-wrap{overflow-x:auto}.offline-banner{background:var(--warning);color:#fff;text-align:center;padding:8px;font-weight:600;font-size:14px}.toast{position:fixed;bottom:20px;left:50%;transform:translate(-50%);background:var(--text);color:#fff;padding:12px 24px;border-radius:var(--radius);font-size:14px;z-index:2000;display:flex;align-items:center;gap:12px;box-shadow:0 4px 12px #0003}.receipt-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}.empty-state{text-align:center;padding:40px 20px;color:var(--text-muted)}.search-input{margin-bottom:12px}.super-admin-page{max-width:800px;margin:0 auto;padding:20px}.tenant-list{display:flex;flex-direction:column;gap:8px}.tenant-row{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:var(--card);border-radius:var(--radius);box-shadow:0 1px 3px #00000014}.settings-form{display:flex;flex-direction:column;gap:16px;max-width:500px}.color-input-row{display:flex;align-items:center;gap:12px}.color-input-row input[type=color]{width:50px;height:40px;padding:2px}.advanced-toggle{color:var(--primary);background:none;padding:8px 0;font-size:14px;text-align:left}