/* Sticky masthead and the mobile drawer.
   Stickiness is CSS-only; no scroll listener and no placeholder element. */

.masthead {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--black);
    border-bottom: var(--hairline) solid var(--seam);
}

.masthead__inner {
    display: flex;
    align-items: center;
    gap: 1rem;
    min-height: 4.75rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    margin-right: auto;
    text-decoration: none;
}

.brand__mark {
    width: 3.125rem;
    height: 3.125rem;
}

.brand__name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--bone);
}

.nav__list {
    display: flex;
    align-items: center;
    gap: clamp(0.5rem, 2vw, 1.75rem);
}

.nav__link {
    position: relative;
    display: block;
    padding: 0.5rem 0.25rem;
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--bone-dim);
    transition: color 0.18s ease;
}

.nav__link::after {
    content: "";
    position: absolute;
    inset: auto 0.25rem 0.25rem;
    height: 2px;
    background-color: var(--olive);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.18s ease;
}

.nav__link:hover,
.nav__link:focus-visible,
.nav__link[aria-current="true"] {
    color: var(--bone);
}

.nav__link:hover::after,
.nav__link[aria-current="true"]::after {
    transform: scaleX(1);
}

/* Drawer trigger --------------------------------------------------------- */

.nav__toggle {
    display: none;
    padding: 0.75rem;
    margin-right: -0.75rem;
    border: 0;
    background: none;
    color: var(--bone);
    cursor: pointer;
}

.nav__toggle svg {
    width: 1.75rem;
    height: 1.75rem;
}

.nav__toggle .icon-close,
.nav__toggle[aria-expanded="true"] .icon-open {
    display: none;
}

.nav__toggle[aria-expanded="true"] .icon-close {
    display: block;
}

@media (max-width: 800px) {
    .nav__toggle {
        display: block;
    }

    .nav {
        position: fixed;
        inset: 4.75rem 0 auto;
        max-height: calc(100dvh - 4.75rem);
        overflow-y: auto;
        background-color: var(--soot);
        border-bottom: var(--hairline) solid var(--seam);
        transform: translateY(-100%);
        visibility: hidden;
        transition: transform 0.24s ease, visibility 0.24s;
    }

    .nav.is-open {
        transform: translateY(0);
        visibility: visible;
    }

    .nav__list {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 0.5rem var(--gutter) 1.5rem;
    }

    .nav__link {
        padding: 1rem 0;
        font-size: 1.75rem;
        border-bottom: var(--hairline) solid var(--seam);
    }

    .nav__link::after {
        inset: auto auto -1px 0;
        width: 2.5rem;
    }
}

body.is-locked {
    overflow: hidden;
}

/* Dims the page behind the open drawer and gives the reader somewhere
   harmless to tap to dismiss it. */
.nav-scrim {
    position: fixed;
    inset: 4.75rem 0 0;
    z-index: 90;
    background-color: rgba(0, 0, 0, 0.72);
    opacity: 0;
    transition: opacity 0.24s ease;
}

.nav-scrim.is-visible {
    opacity: 1;
}