/* ============================================================
   Visual system – mobile navigation
   Hamburger menu and mobile overrides.
   ============================================================ */

.NavToggle {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
}

/* The checkbox is a pixel of nothing, so focusing it showed a ring around a
   pixel of nothing - somebody tabbing had no idea they were on the menu. The
   ring goes on the bars they can actually see instead. */
.NavToggle:focus-visible + .NavHamburger {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.NavHamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    width: 2.25rem;
    cursor: pointer;
}

.NavHamburgerBar {
    width: 1.35rem;
    height: 2px;
    border-radius: var(--radius-pill);
    background-color: var(--ink);
    transition:
        transform 0.2s ease,
        opacity 0.2s ease;
}

.NavToggle:checked ~ .NavHamburger .NavHamburgerBar:nth-child(1) {
    transform: translateY(calc(0.5rem + 2px)) rotate(45deg);
}

.NavToggle:checked ~ .NavHamburger .NavHamburgerBar:nth-child(2) {
    opacity: 0;
}

.NavToggle:checked ~ .NavHamburger .NavHamburgerBar:nth-child(3) {
    transform: translateY(calc(-0.5rem - 2px)) rotate(-45deg);
}

@media (max-width: 48rem), (max-height: 32rem) {
    .NavHamburger {
        display: flex;
        position: fixed;
        top: 0;
        right: 1rem;
        height: var(--nav-height);
        z-index: 30;
    }

    .MainNavigation {
        display: block !important;
        height: var(--nav-height);
        overflow: hidden;
        padding-block: 0;
    }

    /* Closed, the bar is the height of one row and everything else is clipped
       out of sight - but clipped is not gone, so the links underneath would
       still take a tap aimed at the page. Only what is on screen answers. */
    .MainNavigation:has(.NavToggle:checked) {
        pointer-events: none;
    }

    .MainNavigation:has(.NavToggle:checked) a,
    .MainNavigation:has(.NavToggle:checked) .LogoutButton,
    .MainNavigation:has(.NavToggle:checked) .NavHamburger {
        pointer-events: auto;
    }

    /* Open, it is the whole screen and nothing indents it: the links carry
       their own padding, and a second inset around them only narrows the one
       column they are read in. */
    .MainNavigation:has(.NavToggle:checked) {
        height: 100dvh;
        overflow-y: auto;
        padding: 0;
    }

    /* Flattened to nothing so every link, however deeply it was nested,
       becomes a row of the one list. A dropdown has no meaning here - there is
       nothing to drop down from when the whole menu is already open. */
    .MainNavigation .NavDropdown,
    .MainNavigation .NavDropdownMenu,
    .MainNavigation .NavAccount,
    .MainNavigation .LogoutForm,
    .MainNavigation > .d-flex {
        display: contents !important;
    }

    .MainNavigation a,
    .MainNavigation .LogoutButton {
        /* Flex rather than block, so the picture at the end of each item can be
           pushed to the far edge the way it is on the desktop menu. */
        display: flex;
        align-items: center;
        width: 100%;
        box-sizing: border-box;
        margin: 0;
        padding: 0.5rem !important;
        border: none !important;
        border-radius: 0.5rem !important;
        background: none !important;
        opacity: 1 !important;
        color: var(--ink) !important;
        font-weight: 500;
        font-size: 1rem;
        text-align: left;
    }

    .MainNavigation a:hover,
    .MainNavigation .LogoutButton:hover {
        background-color: var(--surface-2) !important;
    }

    /* Against the far edge here too - the menu is the whole screen, and a
       column of pictures down the side of it is the fastest thing to read. */
    .MainNavigation :is(a, .LogoutButton) .Emoji:last-child {
        margin-inline: auto 0;
    }

    .MainNavigation .NavBrand {
        display: flex;
        align-items: center;
        min-height: var(--nav-height);
    }
}