/* Global styles */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background-color: #f4f7f9;
    --card-background: #ffffff;
    --text-color: #333;
    --light-text-color: #666;
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* Login Styles */
.login-page {
    display: none;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
}

.login-page.active {
    display: flex;
}

.pos-container {
    display: none;
}

.pos-container.active {
    display: flex;
}

.login-box {
    background-color: var(--card-background);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-box h2 {
    margin-bottom: 24px;
    color: var(--primary-color);
}

.error-message {
    color: #e74c3c;
    margin-top: 10px;
    font-size: 14px;
    visibility: hidden;
}

.error-message.show {
    visibility: visible;
}

/* Layout */
.pos-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: var(--primary-color);
    color: #fff;
    display: flex;
    flex-direction: column;
    padding: 24px 0;
    box-shadow: 2px 0 6px rgba(0, 0, 0, 0.1);
}

.logo {
    font-size: 24px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 32px;
}

.nav-links {
    list-style: none;
}

.nav-links li a {
    display: block;
    padding: 16px 24px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: background-color 0.3s, color 0.3s;
}

.nav-links li a:hover,
.nav-links li a.active {
    background-color: rgba(0, 0, 0, 0.2);
    color: #fff;
}

.main-content {
    flex-grow: 1;
    padding: 32px;
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-header {
    margin-bottom: 24px;
    border-bottom: 2px solid #ddd;
    padding-bottom: 8px;
}

/* POS Layout */
.pos-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 32px;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}

.product-card {
    background-color: var(--card-background);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    text-align: center;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.product-name {
    font-size: 18px;
    font-weight: 600;
}

.product-sku {
    color: var(--light-text-color);
    font-size: 12px;
}

.product-price {
    font-size: 20px;
    font-weight: 700;
    color: var(--secondary-color);
    margin: 8px 0;
}

.product-stock {
    font-size: 14px;
    color: var(--light-text-color);
}

/* Cart */
.cart {
    background-color: var(--card-background);
    padding: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.cart h3 {
    margin-bottom: 16px;
    font-size: 22px;
}

.cart-items {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 16px;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid #eee;
}

.cart-item:last-child {
    border-bottom: none;
}

.cart-item-info strong {
    font-weight: 600;
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-small {
    background: #eee;
    border: none;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
}

.btn-small:hover {
    background: #ddd;
}

.btn-danger {
    background: #e74c3c;
    color: #fff;
}

.btn-danger:hover {
    background: #c0392b;
}

.cart-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 2px solid #eee;
}

.total-amount {
    color: var(--secondary-color);
}

.checkout-btn {
    width: 100%;
    padding: 16px;
    font-size: 18px;
    font-weight: 600;
    background-color: var(--secondary-color);
    color: #fff;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s;
    margin-top: 20px;
}

.checkout-btn:hover {
    background-color: #2980b9;
}

/* Inventory List */
.inventory-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.inventory-item {
    background-color: var(--card-background);
    padding: 16px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.low-stock {
    border-left: 5px solid #e67e22;
}

.low-stock .inventory-info {
    font-weight: 600;
    color: #e67e22;
}

.delete-btn {
    background-color: #e74c3c;
    color: #fff;
    border: none;
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
}

.delete-btn:hover {
    background-color: #c0392b;
}

/* Transaction List */
.transaction-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.transaction-item {
    background-color: var(--card-background);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.transaction-header {
    display: flex;
    justify-content: space-between;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.transaction-amount {
    color: var(--secondary-color);
}

.transaction-date {
    font-size: 14px;
    color: var(--light-text-color);
    margin-bottom: 8px;
}

.transaction-items {
    font-size: 14px;
}

/* Dashboard Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.stat-card {
    background-color: var(--card-background);
    padding: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--secondary-color);
}

.stat-label {
    font-size: 16px;
    color: var(--light-text-color);
    margin-top: 8px;
}

/* Form */
.add-product-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 500px;
    background-color: var(--card-background);
    padding: 32px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 8px;
}

.form-group input {
    padding: 12px;
    border-radius: var(--border-radius);
    border: 1px solid #ddd;
    font-size: 16px;
}

.submit-btn {
    padding: 14px;
    font-size: 16px;
    font-weight: 600;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s;
}

.submit-btn:hover {
    background-color: #34495e;
}

/* Empty states */
.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--light-text-color);
    font-style: italic;
}

/* Transaction Filters & Buttons */
.filter-container {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

#transactionSearch {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
}

.date-filter {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.date-filter input {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
}

.action-buttons {
    margin-bottom: 20px;
    display: flex;
    gap: 10px;
}

.clear-btn {
    padding: 10px 15px;
    font-size: 16px;
    background-color: #f39c12;
    color: #fff;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s;
}

.clear-btn:hover {
    background-color: #e67e22;
}

.clear-data-btn {
    padding: 10px 15px;
    font-size: 16px;
    background-color: #e74c3c;
    color: #fff;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s;
}

.clear-data-btn:hover {
    background-color: #c0392b;
}

/* Dashboard Controls */
.dashboard-controls {
    margin-bottom: 24px;
}

#dashboardFilter {
    padding: 8px 12px;
    font-size: 16px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    background-color: #fff;
    cursor: pointer;
}

/* Gaya Carta */
.chart-container {
    margin-top: 40px;
    background-color: var(--card-background);
    padding: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.chart-container h3 {
    margin-bottom: 20px;
    text-align: center;
}

/* Gaya Modal (Tetingkap Pop-up) */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background-color: #fff;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
    width: 90%;
    max-width: 400px;
}

.modal-content #receiptPreview {
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    line-height: 1.5;
    padding-bottom: 20px;
}

.modal-buttons {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    margin-top: 10px;
}

/* Khas untuk Cetakan Sahaja */
@media print {
    body {
        background-color: #fff;
    }

    .pos-container,
    .login-page,
    .modal-overlay,
    .nav-links,
    .sidebar,
    .tab-header,
    .checkout-btn,
    .product-grid,
    .cart h3,
    .cart-summary,
    .cart-item-controls,
    .action-buttons,
    .filter-container {
        display: none !important;
    }

    .modal-content {
        padding: 0;
        box-shadow: none;
    }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .pos-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        padding: 16px;
        flex-direction: row;
        justify-content: space-around;
        box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    }
    
    .logo {
        display: none;
    }

    .nav-links {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        width: 100%;
    }

    .nav-links li a {
        padding: 12px 16px;
        font-size: 14px;
        text-align: center;
    }
    
    .main-content {
        padding: 16px;
    }

    .pos-layout {
        grid-template-columns: 1fr;
    }

    .cart {
        margin-top: 32px;
    }

    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 12px;
    }

    .product-card {
        padding: 16px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .add-product-form {
        padding: 24px;
    }

    .date-filter {
        flex-direction: column;
        align-items: flex-start;
    }

    .date-filter input {
        width: 100%;
    }
}