body,
html {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow-x: hidden;
    font-family: 'Roboto', sans-serif;
}

body {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.heading {
    text-align: center;
    font-size: 45px;
    color: #051f20;
    padding: 15px;
    margin-bottom: 10px;
    text-shadow: 3px 3px 10px rgba(0, 0, 0, 0.5), 0 0 10px rgba(255, 255, 255, 0.2);
    letter-spacing: 3px;
    background: linear-gradient(40deg, #91e09f, #47915e);
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    width: fit-content;
    /* Ensures the heading width fits its content */
    margin: 0 auto;
    /* Centers the heading horizontally */
}


.calculator {
    padding: 30px 20px 20px;
    background: linear-gradient(40deg, #91e09f, #47915e);
    flex-grow: 1;
}

.calculator-container {
    background: linear-gradient(40deg, #163832, #235347);
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 15px;
    max-width: 750px;
    margin: 0 auto;
    border: 3.5px solid transparent;
}

.calculator-container h2 {
    margin-bottom: 30px;
    color: #ffffff;
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.4);
}

.calculator-container .form-row {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-bottom: 1px;
}

.calculator-container .form-group {
    flex: 1 1 45%;
    margin-bottom: 20px;
    padding-right: 25px;
}

.calculator-container label {
    display: block;
    font-size: 18px;
    color: #ffffff;
    font-weight: 700;
    padding-right: 50px;
}

.calculator-container select,
.calculator-container input[type="text"],
.calculator-container input[type="number"] {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border-radius: 5px;
    border: 1px solid #47915e;
    background-color: #47915e;
    color: #ffffff;
    margin-top: 0.5rem;
    box-sizing: border-box;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    font-family: 'Roboto', sans-serif;
}

.calculator-container button {
    padding: 12px 24px;
    font-size: 18px;
    background-color: #47915e;
    color: hsl(0, 0%, 100%);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    font-weight: 700;
    margin: 0 auto;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.calculator-container button:hover {
    background-color: #006e53;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

#result {
    font-size: 20px;
    margin-top: 20px;
    color: #ffffff;
    font-weight: 700;
    text-align: center;
}

@media (max-width: 768px) {
    .calculator-container .form-group {
        flex: 1 1 100%;
    }
}