:root {
    --bar-width: 2.5rem;
    --bar-height: .4rem;
    --hamburger-gap: .4rem;
    --foreground: #bbb;
    --background: white;
    --hamburger-margin: .2rem;
    --hamburger-animation-timing: 2s ease-in-out;
    --sidebar-animation-timing: .4s ease-in-out;
    --hamburger-height: calc(var(--bar-height) * 3 + var(--hamburger-gap) * 2);
}



.hamburger-menu {
    --x-width: calc(var(--hamburger-height) * 1.41421356237);
    display: flex;
    flex-direction: column;
    gap: var(--hamburger-gap);
    width: max-content;
    height: calc(var(--x-width) * 1.25);
    position: relative;
    top: var(--hamburger-margin);
    left: var(--hamburger-margin);
    padding-top: var(--hamburger-margin);
    padding-left: var(--hamburger-margin);
    z-index: 5;
    cursor: pointer;
}

input#hamburger-checkbox {
    display: none;
}

.hamburger-menu::before,
.hamburger-menu::after,
.hamburger-menu > span {
    content: "";
    width: var(--bar-width);
    height: var(--bar-height);
    background-color: var(--foreground);
    border-radius: 9999px;
    transform-origin: left center;
    transition: opacity var(--hamburger-animation-timing),
    width var(--hamburger-animation-timing),
    translate var(--hamburger-animation-timing),
    rotate var(--hamburger-animation-timing),
    background-color var(--hamburger-animation-timing),
    color var(--hamburger-animation-timing)
;
}

input#hamburger-checkbox:checked ~ .hamburger-menu::before,
input#hamburger-checkbox:checked ~ .hamburger-menu::after,
input#hamburger-checkbox:checked ~ .hamburger-menu > span {
    background-color: var(--background);
    color: var(--foreground);
}

.hamburger-menu > span {
    appearance: none;
    margin: 0;
    padding: 0;
    outline: none;
    pointer-events: none;
}

input#hamburger-checkbox:checked ~ .hamburger-menu::before {
    rotate: 45deg;
    width: var(--x-width);
    translate: 0 calc(var(--bar-height) / -2);
}

input#hamburger-checkbox:checked ~ .hamburger-menu::after {
    rotate: -45deg;
    width: var(--x-width);
    translate: 0 calc(var(--bar-height) / 2);
}

input#hamburger-checkbox:checked ~ .hamburger-menu > span {
    opacity: 0;
    width: 0;
    translate: calc(var(--bar-width) / 2) 0;
}

.sidebar {
    top: 0;
    opacity: 0;
    max-height: 0;
    width: 0;
    overflow: hidden;
    white-space: nowrap;

    position: absolute;
    z-index: -1;
    transition: opacity var(--sidebar-animation-timing),
    min-height var(--sidebar-animation-timing),
    max-height var(--sidebar-animation-timing),
    z-index var(--sidebar-animation-timing),
    width var(--sidebar-animation-timing),
    padding var(--sidebar-animation-timing)
;
    min-height: 0;
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);


}

input#hamburger-checkbox:checked ~ .sidebar {
    /*translate: 0;*/
    top: 0;
    opacity: .96;
    max-height: 999em;
    min-height: 100vh;
    width: 100%;
    z-index: 4;
    padding: calc(var(--hamburger-height) + var(--hamburger-margin) + 1rem) 1rem .5rem;
}


@media (min-width: 680px) {
    input#hamburger-checkbox:checked ~ .sidebar {
        width: 25rem;
    }
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}