body {
    font-family: 'Roboto', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    background: #f7f7f7; /* Slightly off-white background */
}
h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
    color: #3f51b5;
}
.mode-selector, .inputs, .output {
    margin-bottom: 20px;
    width: 100%;
    max-width: 500px;
    background: #ffffff; /* White background */
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); /* Light box shadow */
}
label {
    font-weight: bold;
    margin-right: 10px;
}
select, input[type="number"] {
    font-size: 1em;
    padding: 8px;
    margin-top: 5px;
    width: calc(100% - 20px);
    border: 1px solid #ccc;
    border-radius: 4px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}
button {
    font-size: 1.2em;
    padding: 10px 20px;
    color: white;
    background: linear-gradient(45deg, #2196f3, #e91e63); /* Blue to pink gradient button */
    border: none;
    border-radius: 5px;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: background 0.3s, transform 0.3s;
    margin-bottom: 1rem;
}
button:hover {
    background: linear-gradient(45deg, #1976d2, #d81b60);
    transform: translateY(-3px);
}
.output {
    text-align: center;
}
.output div {
    margin-top: 10px;
}
.recommendation {
    padding: 15px;
    color: white;
    border-radius: 5px;
    font-size: 1.2em;
    transition: background 0.5s;
}
.recommendation.green {
    background: linear-gradient(45deg, #4caf50, #81c784);
}
.recommendation.orange {
    background: linear-gradient(45deg, #ffa726, #ffb74d);
}
.recommendation.red {
    background: linear-gradient(45deg, #f44336, #e57373);
}