/* Enhanced styles.css with modern design and additional components */
:root {
    --primary: #4299e1;
    --primary-dark: #2474b6;
    --secondary: #ff4081;
    --accent: #f8bbd0;
    --light: #fce4ec;
    --dark: #880e4f;
    --success: #4caf50;
    --warning: #ff9800;
    --danger: #f44336;
    --gray: #9e9e9e;
    --light-gray: #f5f5f5;
    --white: #ffffff;
    --text: #212121;
    --text-light: #757575;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --radius: 8px;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f9f9f9;
    color: var(--text);
    line-height: 1.6;
}

/* Header styles */
header {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.header-title {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.store-logo {
    width: 40px;
    height: 40px;
    background-color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--primary);
}

nav {
    display: flex;
    gap: 1rem;
}

.nav-btn {
    background-color: var(--white);
    color: var(--primary);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background-color: var(--light);
    transform: translateY(-2px);
}

/* Main container */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Login container */
.login-container {
    max-width: 450px;
    margin: 100px auto;
    padding: 2.5rem;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
}

.login-header {
    margin-bottom: 2rem;
}

.login-header h1 {
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-light);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    text-align: left;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text);
}

.form-group input {
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: var(--radius);
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(233, 30, 99, 0.2);
}

.login-btn {
    background-color: var(--primary);
    color: var(--white);
    border: none;
    padding: 0.75rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s;
}

.login-btn:hover {
    background-color: var(--primary-dark);
}

/* Card component */
.card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #eee;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
}

/* Grid layouts */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

/* Form styles */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-control {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-control label {
    font-weight: 500;
    color: var(--text);
}

.form-control input,
.form-control select,
.form-control textarea {
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: var(--radius);
    font-size: 1rem;
}

.form-control input:focus,
.form-control select:focus,
.form-control textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(233, 30, 99, 0.2);
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
}

.btn-secondary {
    background-color: var(--secondary);
    color: var(--white);
}

.btn-secondary:hover {
    background-color: var(--primary);
}

.btn-success {
    background-color: var(--success);
    color: var(--white);
}

.btn-success:hover {
    background-color: #388e3c;
}

.btn-danger {
    background-color: var(--danger);
    color: var(--white);
}

.btn-danger:hover {
    background-color: #d32f2f;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* Product grid */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.product-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

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

.product-image {
    height: 160px;
    background-color: var(--light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 3rem;
}

.product-info {
    padding: 1rem;
}

.product-name {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.product-price {
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.product-stock {
    color: var(--text-light);
    font-size: 0.875rem;
}

.product-category {
    background-color: var(--light);
    color: var(--primary);
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    display: inline-block;
    margin-top: 0.5rem;
}

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

.cart-item-info {
    flex: 1;
}

.cart-item-name {
    font-weight: 500;
}

.cart-item-price {
    color: var(--primary);
    font-weight: 600;
}

.cart-item-quantity {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quantity-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid #ddd;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.quantity-input {
    width: 40px;
    text-align: center;
    padding: 0.25rem;
    border: 1px solid #ddd;
    border-radius: var(--radius);
}

.cart-summary {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 2px solid #eee;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.summary-total {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

/* Barcode scanner */
.barcode-scanner {
    position: relative;
    margin-bottom: 1.5rem;
}

.scanner-container {
    width: 100%;
    height: 300px;
    background-color: #000;
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
}

.scanner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    flex-direction: column;
    gap: 1rem;
}

.scanner-btn {
    background-color: var(--primary);
    color: var(--white);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
}

.scanner-fallback {
    margin-top: 1rem;
    display: flex;
    gap: 0.5rem;
}

.scanner-input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: var(--radius);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal {
    background-color: var(--white);
    border-radius: var(--radius);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid #eee;
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid #ddd;
    margin-bottom: 1.5rem;
}

.tab {
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.3s;
}

.tab.active {
    border-bottom-color: var(--primary);
    color: var(--primary);
    font-weight: 500;
}

.tab-content {
    display: none;
}

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

/* Utilities */
.text-center {
    text-align: center;
}

.mb-1 {
    margin-bottom: 1rem;
}

.mb-2 {
    margin-bottom: 2rem;
}

.mt-1 {
    margin-top: 1rem;
}

.mt-2 {
    margin-top: 2rem;
}

.hidden {
    display: none;
}

/* Responsive design */
@media (max-width: 1024px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    }
}

@media (max-width: 768px) {
    .main-container {
        padding: 1rem;
    }
    
    header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    nav {
        width: 100%;
        justify-content: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .grid-3 {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .product-grid {
        grid-template-columns: 1fr 1fr;
    }
}