html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;    
    background-color: #121212;
    color: white;
    width: 100%;
}

.container {
    min-height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

#main {
    flex: 1;
    width: 100%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 0;
}

.footer {    
    margin-top: auto;
    text-align: center;
    border-top: #0d6efd solid 2px;
    width:100%;
    padding: 1rem 0;    
}

#calcForm {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    border: solid white 2px;
    border-radius: 10px;
    margin-bottom: 3rem;
    min-width: 320px;
    /*     width: fit-content; */
    /* gap: 1rem; */
}

.formInput {
    width: 100%;
    background-color: #333333;
    border-radius: 10px;
    padding: 0.5rem;
    margin: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.formInput label {
    margin-bottom: 0.2rem;
}

.result {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    border: solid white 2px;
    border-radius: 10px;
}

.btn {
    display: inline-block;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    border-radius: 0.375rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out,
        border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

/* Green success button variant */
.btn-success {
    color: #fff;
    background-color: #198754;
    border-color: #198754;
}

.btn-success:hover {
    color: #fff;
    background-color: #157347;
    border-color: #146c43;
}

.btn-success:focus {
    color: #fff;
    background-color: #157347;
    border-color: #146c43;
    box-shadow: 0 0 0 0.25rem rgba(25, 135, 84, 0.5);
}

.btn-success:active {
    color: #fff;
    background-color: #146c43;
    border-color: #13653f;
}

.btn-success:disabled {
    color: #fff;
    background-color: #198754;
    border-color: #198754;
    opacity: 0.65;
    pointer-events: none;
}

.form-control {
    display: block;
    width: 90%;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.375rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    color: #212529;
    background-color: #fff;
    border-color: #86b7fe;
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.form-control::placeholder {
    color: #6c757d;
    opacity: 1;
}

.form-control:disabled,
.form-control[readonly] {
    background-color: #e9ecef;
    opacity: 1;
}


.form-check-input {
    width: 3em;
    height: 1.5em;
    appearance: none;
    background-color: #dee2e6;
    border: 1px solid rgba(0, 0, 0, 0.25);
    border-radius: 1.5em;
    position: relative;
    outline: none;
    cursor: pointer;
    transition: background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
}

.form-check-input::before {
    content: "";
    position: absolute;
    top: 0.25em;
    left: 0.125em;
    width: 0.75em;
    height: 0.75em;
    background-color: #fff;
    border-radius: 50%;
    transition: transform 0.15s ease-in-out;
}

.form-check-input:checked {
    background-color: #0d6efd;
    border-color: #0d6efd;
}

.form-check-input:checked::before {
    transform: translateX(1.5rem);
}

.form-check-label {
    margin-bottom: 0;
    cursor: pointer;
}

.rainbow-link {
    display: inline-block;
    font-weight: bold;
    text-decoration: none;
    background-image: linear-gradient(90deg, red, orange, yellow, green, cyan, blue, violet, red);
    background-size: 300% auto;
    color: white;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: rainbowAnimation 3s linear infinite;
    transition: transform 0.3s ease-in-out;
}

.rainbow-link:hover {
    transform: scale(1.2);
}

@keyframes rainbowAnimation {
    0% {
        background-position: 0% center;
    }

    100% {
        background-position: 300% center;
    }
}