body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background: #f5f5f5;
}

.container {
    max-width: 500px;
    margin: 20px auto;
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px #0000001a;
}

h1 {
    color: #333;
    text-align: center;
    margin-bottom: 30px;
}

.upload-box {
    border: 2px dashed #4CAF50;
    border-radius: 8px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    margin-bottom: 20px;
    background: #f9f9f9;
    transition: background 0.3s;
}

.upload-box:hover {
    background: #f0f0f0;
}

.upload-icon {
    font-size: 40px;
    margin-bottom: 10px;
}

.file-info {
    padding: 15px;
    background: #f8f9fa;
    border-radius: 6px;
    margin-bottom: 20px;
    display: none;
}

.file-size {
    float: right;
    color: #666;
    font-size: 14px;
}

.range-section {
    margin-bottom: 25px;
    text-align: center;
}

.range-section label {
    display: block;
    margin-bottom: 10px;
    color: #555;
}

.range-section input[type="number"] {
    width: 80px;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    text-align: center;
}

button[type="submit"] {
    width: 100%;
    padding: 15px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

button[type="submit"]:hover {
    background: #45a049;
}

button[type="submit"]:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.status {
    margin-top: 20px;
    padding: 15px;
    background: #e8f5e8;
    border-radius: 6px;
    text-align: center;
    color: #2e7d32;
}