:root {
    /* Color Palette - Premium Dark Theme */
    --bg-color: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    --transition-speed: 0.3s;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    /* Soft gradients for a dynamic background */
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
}

/* Glassmorphism utility */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

/* Layout */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.sidebar {
    width: 260px;
    margin: 16px;
    display: flex;
    flex-direction: column;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 24px;
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    border-bottom: 1px solid var(--glass-border);
}
.logo ion-icon { font-size: 1.8rem; color: var(--primary-color); }

.nav-links {
    list-style: none;
    padding: 16px 0;
    flex: 1;
}

.nav-links li {
    padding: 16px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-weight: 500;
    color: var(--text-secondary);
}

.nav-links li ion-icon { font-size: 1.4rem; }

.nav-links li:hover, .nav-links li.active {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border-left: 4px solid var(--primary-color);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 16px 16px 16px 0;
    overflow: hidden;
}

.top-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    margin-bottom: 16px;
}

.date-time {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Views */
.view-section {
    display: none;
    flex: 1;
    overflow-y: auto;
    animation: fadeIn 0.4s ease-out;
}
.view-section.active { display: flex; flex-direction: column; gap: 20px;}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Dashboard */
.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.card {
    display: flex;
    align-items: center;
    padding: 24px;
    gap: 20px;
    transition: transform 0.2s;
}
.card:hover { transform: translateY(-5px); }

.card-icon {
    width: 60px; height: 60px;
    border-radius: 50%;
    display: flex; justify-content: center; align-items: center;
    font-size: 2rem;
}
.highlight-blue .card-icon { background: rgba(59,130,246,0.2); color: var(--primary-color); }
.highlight-green .card-icon { background: rgba(16,185,129,0.2); color: var(--success-color); }
.highlight-red .card-icon { background: rgba(239,68,68,0.2); color: var(--danger-color); }
.highlight-orange .card-icon { background: rgba(245,158,11,0.2); color: var(--warning-color); }

.card-info h3 { font-size: 0.9rem; color: var(--text-secondary); font-weight: 500; margin-bottom: 4px; }
.card-info p { font-size: 1.8rem; font-weight: 700; color: #fff; }

.dashboard-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    flex: 1;
}

.details-panel {
    padding: 24px;
    display: flex; flex-direction: column;
}

.details-panel h2 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    display: flex; align-items: center; gap: 8px;
    color: var(--text-primary);
}

/* Tables */
.table-container { overflow-x: auto; flex: 1; }
table { width: 100%; border-collapse: collapse; text-align: left; }
th { padding: 16px; border-bottom: 1px solid var(--glass-border); color: var(--text-secondary); font-weight: 600; }
td { padding: 16px; border-bottom: 1px solid rgba(255,255,255,0.05); }
tr:hover td { background: rgba(255,255,255,0.02); }

.status-badge {
    padding: 4px 10px; border-radius: 20px; font-size: 0.8rem; font-weight: 600; display: inline-block;
}
.status-danger { background: rgba(239,68,68,0.2); color: #fca5a5; }
.status-warning { background: rgba(245,158,11,0.2); color: #fcd34d; }

/* Buttons */
.btn {
    padding: 10px 20px; border: none; border-radius: 8px;
    font-weight: 600; cursor: pointer; transition: all var(--transition-speed);
    display: flex; align-items: center; justify-content: center; gap: 8px;
}
.btn-primary { background: var(--primary-color); color: white; }
.btn-primary:hover { background: var(--primary-hover); box-shadow: 0 0 15px rgba(59,130,246,0.5); }
.btn-secondary { background: rgba(255,255,255,0.1); color: white; border: 1px solid var(--glass-border); }
.btn-secondary:hover { background: rgba(255,255,255,0.2); }
.btn-danger { background: var(--danger-color); color: white; }
.btn-danger:hover { background: #dc2626; }
.btn-icon { padding: 8px; border-radius: 6px; background: transparent; color: var(--text-secondary); font-size: 1.2rem; cursor: pointer; border:none; transition: 0.2s;}
.btn-icon:hover { background: rgba(255,255,255,0.1); color: white; }

.btn-large { padding: 16px 24px; font-size: 1.1rem; width: 100%; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
label { display: block; margin-bottom: 8px; font-size: 0.9rem; color: var(--text-secondary); }
input {
    width: 100%; padding: 12px;
    background: rgba(0,0,0,0.2); border: 1px solid var(--glass-border);
    border-radius: 8px; color: white; outline: none;
    transition: border 0.3s;
}
input:focus { border-color: var(--primary-color); }
input[type="date"]::-webkit-calendar-picker-indicator { filter: invert(1); cursor: pointer; }

/* POS View Specifics */
.pos-container {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 20px;
    height: 100%;
}

.pos-products { padding: 20px; display: flex; flex-direction: column; gap: 20px; }
.search-bar {
    display: flex; align-items: center; gap: 12px;
    background: rgba(0,0,0,0.2); padding: 0 16px; border-radius: 8px;
    border: 1px solid var(--glass-border);
}
.search-bar ion-icon { font-size: 1.2rem; color: var(--text-secondary); }
.search-bar input { border: none; background: transparent; padding: 16px 0; }
.search-bar input:focus { border-color: transparent; }

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
    overflow-y: auto;
    padding-right: 10px;
}
/* Scrollbar custom */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

.product-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px; padding: 16px;
    cursor: pointer; text-align: center;
    transition: all 0.2s;
    display: flex; flex-direction: column; justify-content: space-between;
}
.product-card:hover { background: rgba(255,255,255,0.1); transform: translateY(-3px); border-color: var(--primary-color); }
.product-card h4 { margin-bottom: 8px; font-size: 1rem; color: #fff;}
.product-card .price { color: var(--success-color); font-weight: 700; font-size: 1.1rem; }
.product-card .stock { font-size: 0.8rem; color: var(--text-secondary); margin-top: 8px; }

.pos-cart { padding: 20px; display: flex; flex-direction: column; }
.pos-cart h2 { font-size: 1.2rem; margin-bottom: 16px; border-bottom: 1px solid var(--glass-border); padding-bottom: 16px; }
.cart-items { flex: 1; overflow-y: auto; margin-bottom: 16px; }
.cart-item {
    display: flex; justify-content: space-between; align-items: center;
    background: rgba(0,0,0,0.2); padding: 12px; border-radius: 8px; margin-bottom: 8px;
    border: 1px solid transparent; transition: 0.2s;
}
.cart-item:hover { border-color: rgba(255,255,255,0.1); }
.cart-item-info h5 { margin-bottom: 4px; font-size:0.95rem; }
.cart-item-info p { font-size: 0.8rem; color: var(--text-secondary); }
.cart-item-controls { display: flex; align-items: center; gap: 8px; }
.qty-btn { background: rgba(255,255,255,0.1); border: none; color: white; width: 26px; height: 26px; border-radius: 4px; cursor: pointer; transition: 0.2s; }
.qty-btn:hover { background: rgba(255,255,255,0.2); }
.item-total { font-weight: 600; width: 60px; text-align: right;}

.cart-summary { background: rgba(0,0,0,0.2); padding: 16px; border-radius: 12px; border: 1px solid var(--glass-border); }
.summary-row { display: flex; justify-content: space-between; margin-bottom: 12px; color: var(--text-secondary); }
.total-row { font-size: 1.4rem; font-weight: 700; color: white; margin-bottom: 20px; border-top: 1px solid var(--glass-border); padding-top: 12px; }

/* Modal */
.modal {
    display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.5); backdrop-filter: blur(8px);
    justify-content: center; align-items: center;
}
.modal.show { display: flex; animation: fadeIn 0.3s; }
.modal-content { width: 100%; max-width: 500px; padding: 32px; box-shadow: 0 20px 40px rgba(0,0,0,0.4); }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.close-modal { font-size: 1.5rem; cursor: pointer; color: var(--text-secondary); transition:0.2s;}
.close-modal:hover { color: white; }
.form-actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 24px; }

/* Toast Notifications */
#toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 9999; display: flex; flex-direction: column; gap: 10px; }
.toast {
    background: var(--glass-bg); backdrop-filter: blur(10px); border: 1px solid var(--glass-border);
    padding: 16px 24px; border-radius: 8px; color: white; display: flex; align-items: center; gap: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3); animation: slideIn 0.3s forwards;
}
.toast.success ion-icon { color: var(--success-color); font-size: 1.5rem; }
.toast.error ion-icon { color: var(--danger-color); font-size: 1.5rem; }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; transform: translateY(10px); } }

/* Inventory header */
.inventory-header { display: flex; justify-content: space-between; margin-bottom: 20px; align-items: center;}
.inventory-header .search-bar { width: 350px; }