body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background-color: #f4f4f4;
    color: #333;
}
.container {
    max-width: 700px;
    margin: 0 auto;
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}
h1, h2 {
    color: #0056b3;
    text-align: center;
}
.input-group {
    margin-bottom: 15px;
}
.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}
.input-group input[type="number"] {
    width: calc(100% - 22px); /* Adjust for padding and border */
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box; /* Include padding and border in the element's total width and height */
}
.input-group span.unit {
    margin-left: 5px;
    color: #666;
}
.button-group {
    text-align: center;
    margin-top: 20px;
}
button {
    background-color: #007bff;
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}
button:hover {
    background-color: #0056b3;
}
#results {
    margin-top: 30px;
    padding: 20px;
    background-color: #e9f7ef;
    border: 1px solid #c3e6cb;
    border-radius: 8px;
    text-align: center;
    font-size: 1.1em;
    display: none; /* Hidden by default */
}
#results p {
    margin: 8px 0;
    font-weight: bold;
}
.error {
    color: red;
    font-weight: bold;
    margin-top: 10px;
    text-align: center;
}
.note {
    font-size: 0.9em;
    color: #555;
    margin-top: 20px;
    text-align: center;
    padding: 0 15px;
}
/* Style for better mobile responsiveness */
@media (max-width: 600px) {
    .container {
        padding: 20px;
        margin: 10px;
    }
    .input-group input[type="number"] {
        width: calc(100% - 20px);
    }
}