:root {
    --bg-color: #2c3e50;
    --card-bg: #34495e;
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --text-color: #ecf0f1;
    --light-text: #bdc3c7;
}

body { 
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

h1, h2 { 
    color: var(--primary-color);
}

.section {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.form-section {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 20px;
    flex-wrap: wrap;
}

.add-product, .generate-barcodes, .set-slot-price {
    width: 300px;
    background-color: var(--bg-color);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.form-description {
    font-size: 0.9em;
    color: var(--light-text);
    margin-bottom: 5px;
}

input, button, select { 
    margin: 5px 0; 
    padding: 8px;
    border-radius: 5px;
    border: 1px solid var(--light-text);
    width: 100%;
    box-sizing: border-box;
    background-color: var(--bg-color);
    color: var(--text-color);
}

button {
    background-color: var(--secondary-color);
    color: var(--bg-color);
    border: none;
    cursor: pointer;
    transition: background-color 0.3s;
    font-weight: bold;
}

button:hover { 
    background-color: #27ae60;
}

.grid { 
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.product-card, .vending-machine-card {
    background-color: var(--bg-color);
    border-radius: 10px;
    padding: 15px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.vending-machine-card {
    cursor: pointer;
}

.product-card:hover, .vending-machine-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.product-image {
    width: 200px;
    height: 200px;
    object-fit: cover;
    margin-bottom: 10px;
    border-radius: 5px;
}

.product-name, .card-title {
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.stock-amount {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.total-value {
    font-size: 1em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.purchase-history {
    font-size: 0.8em;
    text-align: left;
    width: 100%;
}

.history-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
    padding: 5px;
    background-color: var(--card-bg);
    border-radius: 4px;
}

.history-date {
    color: var(--light-text);
}

.history-amount {
    color: var(--secondary-color);
    font-weight: bold;
}

.history-price {
    color: var(--primary-color);
}

.no-history {
    color: var(--light-text);
    font-style: italic;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: var(--card-bg);
    margin: 15% auto;
    padding: 20px;
    border: 1px solid var(--light-text);
    width: 80%;
    max-width: 500px;
    border-radius: 10px;
}

.close {
    color: var(--light-text);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: var(--text-color);
    text-decoration: none;
    cursor: pointer;
}

.form-group {
    margin-bottom: 15px;
}

.status-active {
    color: var(--secondary-color);
}

.status-inactive {
    color: var(--accent-color);
}