body {
    font-family: Arial, sans-serif;
    background: #f4f6f8;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.converter {
    background: #ffffff;
    padding: 25px;
    width: 350px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h2 {
    text-align: center;
    margin-bottom: 20px;
}

select, input {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    font-size: 16px;
}

.row {
    display: flex;
    gap: 10px;
}

.row select {
    width: 50%;
}

.output {
    background: #f0f0f0;
    padding: 10px;
    margin-top: 10px;
    font-size: 18px;
    text-align: center;
    border-radius: 5px;
}

.unit-box {
    width: 50%;
    display: flex;
    flex-direction: column;
}

.unit-box label {
    font-size: 14px;
    margin-bottom: 4px;
    color: #555;
}