:root {
    --primary-bg: #4f46e5;
    --primary-hover: #4338ca;
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #eab308;
    --staff-color: #a855f7;
    --discount-color: #06b6d4;
}

/* Theme Skins Variants */
body.theme-dark {
    --bg-light: #0f172a; --text-dark: #f8fafc; --border-color: #334155;
}
body.theme-dark .main-container, body.theme-dark .panel-card { background-color: #1e293b; color: #f8fafc; }
body.theme-dark input, body.theme-dark select, body.theme-dark table { background: #0f172a; color: #f8fafc; border-color: #334155; }
body.theme-dark .shift-lock-overlay { background: rgba(30, 41, 59, 0.95); }

body.theme-emerald { --primary-bg: #059669; --primary-hover: #047857; }
body.theme-velvet { --primary-bg: #db2777; --primary-hover: #be185d; }

* { box-sizing: border-box; margin: 0; padding: 0; font-family: -apple-system, sans-serif; }
body { background-color: #f1f5f9; color: var(--text-dark); overflow-x: hidden; }

.app-header { background-color: #1e293b; color: white; padding: 8px 16px; display: flex; justify-content: space-between; align-items: center; position: sticky; top: 0; z-index: 100; }
.brand-zone h1 { font-size: 1.1rem; font-weight: 700; }
.system-time { font-size: 0.75rem; color: #94a3b8; font-family: monospace; }

.nav-tabs { display: flex; background: #1e293b; position: sticky; top: 40px; z-index: 99; overflow-x: auto; }
.tab-btn { flex: 1; min-width: 90px; padding: 12px 6px; background: none; border: none; color: #94a3b8; font-size: 0.8rem; font-weight: 600; cursor: pointer; white-space: nowrap; }
.tab-btn.active { color: #38bdf8; border-bottom: 2px solid #38bdf8; }

.main-container { padding: 8px; display: block; }

/* Responsive Layout Infrastructure for Handheld Rotation Adaptations */
.responsive-pos-layout { display: flex; flex-direction: column; gap: 8px; }
.checkout-and-holds-container { display: flex; flex-direction: column; gap: 8px; }

/* Grid Matrix for Tablets, Desktops, or Horizontal Smart Device Views */
@media (min-width: 768px) or (orientation: landscape) {
    .responsive-pos-layout { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 10px; align-items: start; }
    .customizer-grid-layout, .analytics-grid-layout { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .full-width-customizer-card, .full-width-analytics-card { grid-column: span 2; }
    .analytics-cards-row { grid-column: span 2; display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
}

.panel-card { background: white; border-radius: 8px; padding: 10px; border: 1px solid var(--border-color); position: relative; margin-bottom: 8px; }
.category-bar { display: flex; gap: 6px; margin-bottom: 8px; overflow-x: auto; padding-bottom: 4px; }
.cat-pill { padding: 6px 12px; background: white; border: 1px solid var(--border-color); border-radius: 20px; font-size: 0.8rem; font-weight: 600; color: var(--text-muted); cursor: pointer; white-space: nowrap; }
.cat-pill.active { background: var(--primary-bg); color: white; }

.menu-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 8px; }
.item-card { background: white; border-radius: 6px; padding: 10px; text-align: center; cursor: pointer; border: 1px solid var(--border-color); min-height: 80px; display: flex; flex-direction: column; justify-content: space-between; }
.item-name { font-size: 0.85rem; font-weight: 600; color: var(--text-dark); }
.item-price { font-size: 0.8rem; color: var(--primary-bg); font-weight: 700; }

.card-hard-food { border-left: 3px solid #ef4444; }
.card-snacks { border-left: 3px solid #f59e0b; }
.card-juices { border-left: 3px solid #10b981; }

.receipt-stream { flex-grow: 1; min-height: 100px; max-height: 200px; overflow-y: auto; margin: 8px 0; padding: 4px; border: 1px dashed var(--border-color); }
.cart-item { display: flex; justify-content: space-between; align-items: center; padding: 4px 0; border-bottom: 1px solid var(--border-color); font-size: 0.85rem; }
.btn-del-cart-item { background: none; border: none; color: var(--danger); cursor: pointer; font-size: 0.85rem; padding-left: 6px; }

.summary-row { display: flex; justify-content: space-between; margin: 2px 0; font-size: 0.8rem; color: var(--text-muted); }
.grand-total-row { display: flex; justify-content: space-between; margin-top: 4px; padding-top: 4px; border-top: 2px solid var(--border-color); font-size: 1.1rem; font-weight: 800; }

input, select { width: 100%; padding: 8px; border: 1px solid var(--border-color); border-radius: 6px; font-size: 0.85rem; margin-bottom: 8px; background: var(--bg-light); color: var(--text-dark); }
label { font-size: 0.75rem; font-weight: 600; color: var(--text-muted); display: block; margin-bottom: 2px; }

/* Tight Matrix Configuration Grid Structure */
.responsive-table-holder { width: 100%; overflow-x: auto; }
.compact-grid-table { width: 100%; border-collapse: collapse; font-size: 0.8rem; white-space: nowrap; }
.compact-grid-table th, .compact-grid-table td { padding: 6px 8px !important; text-align: left; border-bottom: 1px solid var(--border-color); }
.compact-grid-table th { background: var(--bg-light); font-weight: 700; color: var(--text-muted); }

.action-cluster-extended { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; margin-top: 6px; }
.btn { padding: 10px 4px; border: none; border-radius: 6px; font-weight: 700; font-size: 0.8rem; cursor: pointer; display: flex; align-items: center; justify-content: center; }
.btn-success { background: var(--success); color: white; }
.btn-warning { background: var(--warning); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-staff { background: var(--staff-color); color: white; }
.btn-discount { background: var(--discount-color); color: white; }
.btn-clear { background: #64748b; color: white; grid-column: span 2; }

.badge { padding: 2px 6px; border-radius: 4px; font-size: 0.7rem; font-weight: 700; text-transform: uppercase; }
.badge-paid { background: #dcfce7; color: #166534; }
.badge-pending { background: #fef9c3; color: #854d0e; }
.badge-unpaid { background: #fee2e2; color: #991b1b; }
.badge-staff { background: #f3e8ff; color: #6b21a8; }
.badge-discount { background: #ecfeff; color: #083344; }

.shift-lock-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(255, 255, 255, 0.95); z-index: 50; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; }
.overlay-hidden { display: none !important; }
.btn-shift-toggle { padding: 10px 20px; font-weight: bold; border-radius: 20px; border: none; cursor: pointer; color: white; font-size: 0.9rem; }
.open-action { background: var(--success); }
.close-action { background: var(--danger); }

.analytics-cards-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; margin-bottom: 8px; }
.stat-card { background: var(--bg-light); border-radius: 6px; padding: 10px; border: 1px solid var(--border-color); }
.stat-card h4 { font-size: 0.7rem; color: var(--text-muted); }
.stat-card p { font-size: 1.1rem; font-weight: 800; }

.onboard-overlay, .modal-overlay { position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(15,23,42,0.6); backdrop-filter: blur(4px); z-index: 200; display: flex; justify-content: center; align-items: center; padding: 12px; }
.onboard-hidden, .modal-hidden { display: none !important; }
.onboard-modal, .modal-box { background: white; width: 100%; max-width: 340px; border-radius: 8px; padding: 16px; }
.receipt-paper { background: #fff; color: #000; padding: 10px; font-family: monospace; border: 1px solid #ccc; max-height: 45vh; overflow-y: auto; font-size:0.75rem; }

.btn-settle { background: var(--success); color: white; border: none; padding: 4px 6px; border-radius: 4px; cursor: pointer; font-size: 0.7rem; }
.btn-catalog-del { background: var(--danger); color: white; border: none; padding: 4px 8px; border-radius: 4px; cursor: pointer; font-size: 0.75rem; }

.active-screen { display: block; }
.hidden-screen { display: none !important; }