body {
    background-color: #1a1a1a; /* Very dark background color */
    color: #ffffff; /* White text for high contrast */
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

.container {
    background-color: #333333; /* Dark gray container */
    border-radius: 15px;
    padding: 30px;
    max-width: 500px;
    width: 100%;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5); /* Stronger shadow for depth */
}

h1 {
    margin-bottom: 20px;
    font-size: 28px;
    color: #ffcc00; /* Bright yellow for the heading */
    text-align: center;
    font-weight: 700;
}

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

.input-group label {
    margin-bottom: 5px;
    font-size: 14px;
    color: #cccccc; /* Light gray for labels */
    font-weight: bold;
}

input, button, select {
    font-size: 16px;
    padding: 10px;
    margin: 5px 0;
    border-radius: 5px;
    border: 1px solid #555555; /* Medium gray border */
    outline: none;
    transition: all 0.3s ease;
    width: 100%;
    background-color: #444444; /* Darker background for inputs */
    color: #ffffff; /* White text for inputs */
}

input:focus, select:focus {
    border-color: #ffcc00; /* Yellow border on focus */
}

button {
    background-color: #ffcc00; /* Button color */
    color: #1a1a1a; /* Dark text for buttons */
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    border: none; /* No border for buttons */
}

button:hover {
    background-color: #e6b800; /* Darker yellow on hover */
    transform: translateY(-1px);
}

#barcode {
    margin: 20px auto;
    display: block;
    border: 1px solid #555555; /* Medium gray border for barcode */
    border-radius: 5px;
}

.fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9); /* Almost black background */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.fullscreen img {
    max-width: 90%;
    max-height: 90%;
    border: 5px solid #ffffff; /* White border for fullscreen image */
    border-radius: 10px;
}

.close-button {
    position: absolute;
    top: 20px;
    right: 30px;
    background-color: #e74c3c; /* Red color for close button */
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 20px;
    cursor: pointer;
    z-index: 10000;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.close-button:hover {
    background-color: #c0392b; /* Darker red on hover */
}