body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #e0f7fa, #b2ebf2);
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header nav {
    background-color: #003366;
    padding: 20px;
    color: white;
    text-align: center;
}

.calculator-selection {
    text-align: center;
    margin: 40px auto;
    padding: 20px;
    width: 60%;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-color: #003366;
    
}

.calculator-options button {
    background-color: #003366;
    color: white;
    border: none;
    padding: 15px 30px;
    margin: 10px;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.calculator-options button:hover {
    background-color: #0055a5;
}

#calculator-container {
    margin: 20px auto;
    padding: 10px;
    width: 40%;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: none; /* Hidden initially */
    background-color:#F0F8F7;
    position: relative;
    z-index: 1; /* Ensures it's above other content */
}


#calculator-container h3 {
    margin-top: 0;
    color: #003366;
}

#calculator-container form {
    display: flex;
    flex-direction: column;
    border-color: #003366;
}

#calculator-container label {
    margin-top: 10px;
    font-weight: bold;
}

#calculator-container input {
    margin-bottom: 10px;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ddd;
}

#calculator-container button {
    background-color: #003366;
    color: white;
    border: none;
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#calculator-container button:hover {
    background-color: #0055a5;
}

footer {
    background-color: #003366;
    color: white;
    text-align: center;
    padding: 20px;
    position: relative;
    width: 100%;
    margin-top: auto; /* Ensures footer stays at the bottom */
}

@media (max-width: 768px) {
    .calculator-selection,
    #calculator-container {
        width: 90%;
    }

    .calculator-options button {
        padding: 10px 20px;
        margin: 5px;
        font-size: 14px;
    }
}