body {
    background-color: #f4f7f6;
    color: #333;
    font-family: 'Roboto', Arial, sans-serif;
    line-height: 1.6;
}

#travel-expense-form {
    max-width: 800px;
    margin: 40px auto;
    padding: 30px;
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

#travel-expense-form h2 {
    text-align: center;
    color: #2c3e50;
    font-size: 24px;
    margin-bottom: 30px;
}

#travel-expense-form fieldset {
    border: none;
    margin-bottom: 25px;
    padding: 0;
}

#travel-expense-form legend {
    font-weight: 600;
    color: #2c3e50;
    font-size: 18px;
    margin-bottom: 15px;
    padding: 0;
}

.form-row {
    margin-bottom: 20px;
}

#travel-expense-form label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #34495e;
    font-size: 14px;
}

#travel-expense-form input[type="text"],
#travel-expense-form input[type="email"],
#travel-expense-form input[type="number"],
#travel-expense-form input[type="datetime-local"],
#travel-expense-form textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #bdc3c7;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

#travel-expense-form input:focus,
#travel-expense-form textarea:focus {
    border-color: #3498db;
    outline: none;
}

#travel-expense-form input[type="submit"] {
    background-color: #3498db;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    width: 100%;
    transition: background-color 0.3s ease;
}

#travel-expense-form input[type="submit"]:hover {
    background-color: #2980b9;
}

#total_costs {
    font-weight: 600;
    margin-top: 20px;
    background-color: #ecf0f1;
    padding: 15px;
    border-radius: 4px;
    color: #2c3e50;
}

#travel-expense-form small {
    display: block;
    margin-top: 20px;
    font-size: 12px;
    color: #7f8c8d;
}

@media (max-width: 600px) {
    #travel-expense-form {
        padding: 20px;
    }
}