/* Modern Gray & White Theme - Mobile Compatible */
:root {
    --primary-gray: #2d3436;
    --light-gray: #dfe6e9;
    --medium-gray: #b2bec3;
    --white: #ffffff;
    --facebook-blue: #1877f2;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --out-of-stock: #ff7675;
    --in-stock: #00b894;
}

/* Base Styles */
html {
    box-sizing: border-box;
    -webkit-text-size-adjust: 100%;
}

*, *:before, *:after {
    box-sizing: inherit;
}

body {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    background-color: #f8f9fa;
    color: var(--primary-gray);
    margin: 0;
    padding: 20px;
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    position: relative;
}

/* Header Styles */
.header {
    display: flex;
    align-items: center;
    margin-bottom: 2rem;
    justify-content: space-between;
}

.logo-container {
    display: flex;
    align-items: center;
}

h1 {
    color: var(--primary-gray);
    font-weight: 700;
    font-size: 2.2rem;
    margin: 0;
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
}

/* Category Filter */
.filter-container {
    margin-bottom: 2rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--medium-gray);
    border-radius: 4px;
    font-size: 1rem;
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.product-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--light-gray);
    position: relative;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.product-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.product-info {
    padding: 1rem;
}

.product-name {
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.product-category {
    font-size: 0.85rem;
    color: var(--medium-gray);
    margin-bottom: 0.5rem;
}

.product-price {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary-gray);
}

.stock-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
}

.in-stock {
    background-color: var(--in-stock);
}

.out-of-stock {
    background-color: var(--out-of-stock);
}

/* Button Styles */
.fb-button {
    background-color: var(--facebook-blue);
    color: white;
    border: none;
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.fb-button:hover {
    background-color: #166fe5;
    transform: translateY(-2px);
}

.ig-button {
    background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
    color: white;
    border: none;
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.ig-button:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
}

.wa-button {
    background-color: #25d366;
    color: white;
    border: none;
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.wa-button:hover {
    background-color: #1ebe5b;
    transform: translateY(-2px);
}

.modern-button {
    border: 1px solid #ccc;
    border-radius: 25px;
    padding: 5px 15px;
    background-color: #f8f9fa;
    color: #333;
    transition: all 0.3s ease;
}

.modern-button:hover {
    background-color: #e9ecef;
    transform: translateY(-2px);
}

.social-buttons {
    display: flex;
    flex-direction: row;
    gap: 10px;
    margin-top: 20px;
}

/* Popup Styles */
.popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
}

.popup-content {
    background-color: #fff;
    margin: 10% auto;
    padding: 20px;
    border-radius: 10px;
    width: 80%;
    max-width: 500px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    text-align: center;
}

.search-container {
    display: flex;
    justify-content: center;
    margin-bottom: -15px;
}

/* Invoice Styles */
.invoice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    margin-left: 20px;
}

.invoice-button {
    background-color: var(--primary-gray);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-left: 10px;
}

.invoice-button:hover {
    background-color: #3a4244;
    transform: translateY(-2px);
}

.invoice-button.cancel {
    background-color: var(--out-of-stock);
}

.invoice-button.cancel:hover {
    background-color: #e74c3c;
}

.invoice-items {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 20px;
}

.invoice-item {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    padding: 8px 0;
    border-bottom: 1px solid var(--light-gray);
    gap: 10px;
}

.invoice-total {
    margin-top: 20px;
    font-size: 1.2em;
    text-align: right;
    padding: 10px;
    background: var(--light-gray);
    border-radius: 5px;
}

.quantity-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background-color: var(--light-gray);
}

.quantity-btn {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: none;
    background-color: var(--primary-gray);
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

.quantity-btn:hover {
    background-color: #3a4244;
}

.product-card.selected {
    border: 2px solid var(--in-stock);
    box-shadow: 0 0 0 2px rgba(0, 184, 148, 0.3);
}

.filter-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.filter-container label {
    font-weight: 600;
}

/* Invoice Popup Styles */
.popup-invoice {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    overflow-y: auto;
}

.popup-invoice-content {
    background-color: white;
    margin: 2% auto;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    max-width: 800px;
    width: 90%;
}

.invoice-header {
    display: flex;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e0e0e0;
}

.invoice-logo {
    height: 80px;
    width: auto;
    margin-right: 25px;
}

.invoice-meta {
    flex: 1;
}

.invoice-meta h2 {
    margin: 0;
    color: #2d3436;
    font-size: 28px;
    font-weight: 700;
}

.invoice-meta p {
    margin: 5px 0 0;
    color: #7f8c8d;
    font-size: 14px;
}

.invoice-body {
    margin: 20px 0;
}

.invoice-customer {
    margin-bottom: 25px;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

.invoice-customer h3 {
    margin: 0 0 15px 0;
    color: #2d3436;
    font-size: 18px;
}

.invoice-input {
    width: 100%;
    padding: 10px;
    margin-bottom: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
    font-size: 14px;
    box-sizing: border-box;
}

.invoice-input:focus {
    outline: none;
    border-color: #00b894;
    box-shadow: 0 0 0 2px rgba(0, 184, 148, 0.2);
}

textarea.invoice-input {
    min-height: 80px;
    resize: vertical;
}

.invoice-items-header {
    display: grid;
    grid-template-columns: 3fr 1fr 1fr 1fr;
    font-weight: 600;
    padding: 12px 0;
    border-bottom: 2px solid #e0e0e0;
    color: #2d3436;
    font-size: 15px;
}

.invoice-items {
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 20px;
}

.invoice-item {
    display: grid;
    grid-template-columns: 3fr 1fr 1fr 1fr;
    padding: 12px 0;
    border-bottom: 1px solid #eee;
    font-size: 14px;
    align-items: center;
}

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

.invoice-item-quantity, 
.invoice-item-price, 
.invoice-item-total {
    text-align: center;
}

.invoice-summary {
    margin-top: 20px;
    text-align: right;
}

.invoice-total {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    padding: 8px 0;
    font-size: 15px;
}

.grand-total {
    font-size: 18px;
    font-weight: 700;
    border-top: 2px solid #2d3436;
    margin-top: 15px;
    padding-top: 15px;
    color: #2d3436;
}

.invoice-footer {
    margin-top: 30px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
    text-align: center;
    color: #7f8c8d;
    font-size: 13px;
    line-height: 1.5;
}

.invoice-actions {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    margin-top: 25px;
}

/* Font Awesome icons */
@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/all.min.css');

/* Enhanced Responsive Adjustments */
@media (max-width: 1024px) {
    .container {
        padding: 15px;
    }
}

@media (max-width: 768px) {
    .header {
        flex-direction: row;
        align-items: center;
        gap: 1rem;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
    }
    
    .product-image {
        height: 180px;
    }
    
    .popup-content {
        width: 90%;
        margin: 15% auto;
    }
    
    .invoice-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .invoice-logo {
        margin-right: 0;
        margin-bottom: 15px;
        height: 60px;
    }
    
    .invoice-items-header,
    .invoice-item {
        grid-template-columns: 2fr 1fr 1fr 1fr;
        font-size: 13px;
    }
    
    .invoice-actions {
        justify-content: center;
        flex-wrap: wrap;
    }
}

@media (max-width: 600px) {
    body {
        padding: 15px;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    }
    
    .product-image {
        height: 150px;
    }
    
    .product-info {
        padding: 0.8rem;
    }
    
    .product-name {
        font-size: 1rem;
    }
    
    .product-price {
        font-size: 1.1rem;
    }
    
    .filter-container {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .product-image {
        height: 140px;
    }
    
    .invoice-items-header,
    .invoice-item {
        grid-template-columns: 1.5fr 0.8fr 1fr 1fr;
    }
    
    .invoice-button {
        padding: 8px 15px;
        font-size: 13px;
    }
    
    .social-buttons {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 360px) {
    h1 {
        font-size: 1.8rem;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .product-image {
        height: 200px;
    }
    
    .popup-content {
        width: 95%;
        padding: 15px;
    }
}

/* Touch device adjustments */
@media (hover: none) {
    .product-card:hover {
        transform: none;
        box-shadow: var(--shadow);
    }
    
    .fb-button:hover,
    .ig-button:hover,
    .wa-button:hover,
    .modern-button:hover,
    .invoice-button:hover,
    .quantity-btn:hover {
        transform: none;
    }
}

/* Print styles */
@media print {
    body * {
        visibility: hidden;
    }
    .popup-invoice, .popup-invoice * {
        visibility: visible;
    }
    .popup-invoice {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: auto;
        background-color: white;
    }
    .popup-invoice-content {
        box-shadow: none;
        margin: 0;
        padding: 20px;
        width: 100%;
        max-width: 100%;
    }
    .invoice-actions {
        display: none;
    }
}