:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #f8fafc;
    --dark: #0f172a;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --text-color: #0f172a;
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --sidebar-bg: #0f172a;
    --muted-color: #64748b;
}

[data-theme="dark"] {
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --secondary: #1e293b;
    --dark: #ffffff;
    --gray-100: #0f172a;
    --gray-200: #1e293b;
    --gray-300: #334155;
    --text-color: #f8fafc;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --border-color: #334155;
    --sidebar-bg: #0b1120;
    --muted-color: #94a3b8;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    overflow-x: hidden;
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}
html {
    height: 100%;
}

/* Custom Premium Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Authentication */
.auth-wrapper {
    height: 100vh;
    background: linear-gradient(135deg, #e0e7ff 0%, #f1f5f9 100%);
}
.glass-panel {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 1.5rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.05);
}

/* Layout */
#appWrapper {
    display: flex;
    height: 100vh;
    min-height: -webkit-fill-available;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: white;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
}
.sidebar .nav-item a {
    color: #cbd5e1;
    text-decoration: none;
    padding: 12px 20px;
    display: block;
    transition: all 0.2s;
    border-radius: 8px;
    margin: 4px 12px;
}
.sidebar .nav-item a:hover, .sidebar .nav-item.active a {
    background-color: rgba(255,255,255,0.1);
    color: white;
}
.sidebar .nav-item a i {
    width: 24px;
    margin-right: 10px;
    text-align: center;
}

/* Content */
.content-wrapper {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.topbar {
    z-index: 10;
}
#viewsContainer {
    flex-grow: 1;
    overflow-y: auto;
}

/* Utilities */
.view-section {
    display: none;
}
.view-section.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Cards & Modals */
.card {
    background-color: var(--card-bg);
    border-color: var(--border-color) !important;
    color: var(--text-color);
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.3s;
}
.modal-content {
    background-color: var(--card-bg);
    color: var(--text-color);
    border-color: var(--border-color);
}
.table {
    color: var(--text-color) !important;
    --bs-table-bg: transparent;
    --bs-table-color: var(--text-color);
}
.table-hover tbody tr:hover {
    background-color: var(--gray-100) !important;
}
.bg-light {
    background-color: var(--gray-100) !important;
}
.bg-white {
    background-color: var(--card-bg) !important;
}
.form-control, .form-select, .input-group-text {
    background-color: var(--card-bg);
    border-color: var(--border-color);
    color: var(--text-color);
}
.form-control:focus, .form-select:focus {
    background-color: var(--card-bg);
    border-color: var(--primary);
    color: var(--text-color);
}
::placeholder {
    color: var(--muted-color) !important;
    opacity: 1;
}
.text-muted {
    color: var(--muted-color) !important;
}
.text-dark {
    color: var(--text-color) !important;
}
.bg-gradient-primary { background: linear-gradient(135deg, #6366f1, #4f46e5); }
.bg-gradient-success { background: linear-gradient(135deg, #34d399, #10b981); }
.bg-gradient-warning { background: linear-gradient(135deg, #fbbf24, #f59e0b); }
.bg-gradient-danger { background: linear-gradient(135deg, #f87171, #ef4444); }
.bg-gradient-info { background: linear-gradient(135deg, #38bdf8, #0ea5e9); }
.bg-gradient-secondary { background: linear-gradient(135deg, #94a3b8, #64748b); }

.kpi-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
}

/* POS Grid */
.product-card {
    cursor: pointer;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    background: var(--card-bg);
    transition: all 0.2s;
    color: var(--text-color);
}
.product-card:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}

/* Print Styles */
@media print {
    body * { visibility: hidden; }
    #printArea, #printArea * { visibility: visible; }
    #printArea { position: absolute; left: 0; top: 0; width: 80mm; font-size: 12px; font-family: monospace; }
}