/* Header tools + mobile menu.
   Under 450px the page links collapse behind a hamburger button.
   The light/dark button is NOT part of the menu: it stays in the bar. */

.site-header__tools {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* ---------- hamburger button (hidden unless under 450px and menu.js is running) ---------- */
.menu-button {
    display: none;
    padding: 0.45rem 0.3rem;
    font: inherit;
    line-height: 1;
    color: inherit;
    background: none;
    border: 1px solid var(--rule);
    border-radius: 4px;
    cursor: pointer;
}

.menu-button:hover {
    border-color: var(--ink);
}

.menu-button:focus-visible {
    outline: 2px solid var(--ink);
    outline-offset: 3px;
}

.menu-button__bars,
.menu-button__bars::before,
.menu-button__bars::after {
    display: block;
    width: 1.5rem;
    height: 2px;
    background-color: var(--ink);
}

.menu-button__bars {
    position: relative;
    margin: 0.5rem 0;
}

.menu-button__bars::before,
.menu-button__bars::after {
    content: "";
    position: absolute;
    left: 0;
}

.menu-button__bars::before { top: -0.35rem; }
.menu-button__bars::after  { top: 0.35rem; }

/* open: the three bars become an X */
.menu-button[aria-expanded="true"] .menu-button__bars {
    background-color: transparent;
}

.menu-button[aria-expanded="true"] .menu-button__bars::before {
    top: 0;
    transform: rotate(45deg);
}

.menu-button[aria-expanded="true"] .menu-button__bars::after {
    top: 0;
    transform: rotate(-45deg);
}

@media (max-width: 42rem) {
    .site-header__tools {
        gap: 0.25rem;
    }
}

/* ---------- under 450px: links collapse into a dropdown ---------- */
@media (max-width: 449.98px) {
    .has-menu .menu-button {
        display: inline-block;
    }

    .has-menu .site-nav {
        display: none;
        position: absolute;
        top: calc(100% + 2px);   /* just below the header's 2px rule */
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0.25rem;
        padding: 0.5rem var(--gutter);
        background-color: var(--paper);
        background-image: var(--grain);
        border-bottom: 2px solid var(--ink);
        font-size: 1rem;
    }

    .has-menu .site-nav.is-open {
        display: flex;
    }

    .has-menu .site-nav a {
        padding: 0.6rem 0.75rem;
    }
}