body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.container {
    background-color: #fff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 600px;
    text-align: center;
}

h1 {
    color: #1a73e8;
    font-size: 28px;
    margin-bottom: 30px;
}

.input-section h2, .result-section h2 {
    color: #333;
    font-size: 22px;
    margin-bottom: 20px;
    border-bottom: 2px solid #1a73e8;
    padding-bottom: 10px;
    display: inline-block;
}

.input-group {
    margin-bottom: 20px;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #555;
}

.input-group input, .input-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box;
}

#calculate-btn {
    background-color: #1a73e8;
    color: #fff;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#calculate-btn:hover {
    background-color: #155ab6;
}

.result-section {
    margin-top: 40px;
}

#result {
    background-color: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    text-align: left;
    font-size: 16px;
    line-height: 1.6;
}