body.csv-dark {
    background-color: #121212 !important;
}

body .csv-converter {
    max-width: 520px;
    margin: 40px auto;
    padding: 25px !important;
    background: #ffffff !important;
    border-radius: 14px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    font-family: Arial, sans-serif;
    color: #000 !important;
}

body .csv-converter.dark-mode {
    background: #1f1f1f !important;
    color: #f1f1f1 !important;
    border: 1px solid #333;
}

body .csv-converter.dark-mode h2 {
    color: #ffffff !important;
}

body .csv-converter input[type="file"],
body .csv-converter select,
body .csv-converter input[type="submit"] {
    width: 100%;
    padding: 14px !important;
    margin-bottom: 18px;
    border: 1px solid #ccc !important;
    border-radius: 10px !important;
    background: #ffffff !important;
    color: #000000 !important;
    font-size: 15px;
}

body .csv-converter.dark-mode input[type="file"],
body .csv-converter.dark-mode select {
    background: #2c2c2c !important;
    color: #e0e0e0 !important;
    border: 1px solid #555 !important;
}

body .csv-converter input[type="submit"] {
    background: #0073aa !important;
    color: white !important;
    font-weight: 600;
    font-size: 15px;
    transition: background 0.3s;
}

body .csv-converter input[type="submit"]:hover {
    background: #005f8d !important;
}

body .csv-converter.dark-mode input[type="submit"] {
    background: #0a84ff !important;
    color: #fff !important;
    font-weight: bold;
}

body .csv-converter.dark-mode input[type="submit"]:hover {
    background: #0066cc !important;
}

body .csv-converter form label {
    display: inline-block;
    margin-bottom: 8px;
    font-weight: 500;
}