body {
    font-family: 'Inter', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #ffffff;
}
.calculator {
    background-color: #ffffff;
    padding: 20px;
    border: 1px solid #000000;
    width: 350px;
}
h1 {
    text-align: center;
    color: #000000;
}
.input-group {
    margin-bottom: 15px;
}
label {
    display: block;
    margin-bottom: 5px;
}
input[type="number"], select {
    width: 100%;
    padding: 8px;
    border: 1px solid #000000;
    box-sizing: border-box;
}
button {
    width: 100%;
    padding: 10px;
    background-color: #ffffff;
    color: #000000;
    border: 1px solid #000000;
    cursor: pointer;
    margin-bottom: 10px;
    transition: background-color 0.3s, color 0.3s;
}
button:hover {
    background-color: #000000;
    color: #ffffff;
}
#result {
    margin-top: 20px;
    text-align: center;
}
.unit-toggle {
    display: flex;
    justify-content: center;
    margin-bottom: 15px;
}
.unit-toggle button {
    width: auto;
    padding: 5px 10px;
    margin: 0 5px;
}
.active {
    background-color: #000000;
    color: #ffffff;
}
.additional-info {
    margin-top: 20px;
    text-align: left;
}
.explanation {
    margin-top: 20px;
    font-size: 14px;
    color: #000000;
}