.site-header {
    background: var(--color-paper);
    border-bottom: 1px solid var(--color-border);
}


/* Small utility navigation */

.site-header__utility-bar {
    border-bottom: 1px solid var(--color-border-light);
}

.site-header__utility-inner {
    min-height: 38px;

    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.site-header__utility {
    display: flex;
    align-items: center;
    gap: 22px;
}

.site-header__utility a {
    font-size: 0.75rem;
    font-weight: 500;

    color: var(--color-muted);
    text-decoration: none;
}

.site-header__utility a:hover {
    color: var(--color-accent);
}


/* Main publication masthead */

.masthead {
    padding: 28px 0 24px;
}

.masthead__inner {
    display: flex;
    justify-content: center;
    align-items: center;
}

.masthead__brand {
    text-align: center;
}

.site-logo {
    display: inline-block;

    font-family: var(--font-display);
    font-size: clamp(2.5rem, 4vw, 3.6rem);
    line-height: 0.95;
    font-weight: 700;

    letter-spacing: -0.045em;

    color: var(--color-navy-dark);
    text-decoration: none;
}

.site-logo span {
    color: var(--color-accent);
}

.masthead__tagline {
    margin: 11px 0 0;

    font-size: 0.72rem;
    line-height: 1.4;
    font-weight: 700;

    letter-spacing: 0.12em;
    text-transform: uppercase;

    color: var(--color-muted);
}


/* Primary navigation */

.primary-nav {
    border-top: 1px solid var(--color-border);
    background: var(--color-paper);
}

.primary-nav__inner {
    min-height: 52px;

    display: flex;
    align-items: center;
    justify-content: center;

    gap: clamp(18px, 3vw, 38px);
}

.primary-nav a {
    position: relative;

    display: flex;
    align-items: center;
    min-height: 52px;

    font-size: 0.8rem;
    line-height: 1;
    font-weight: 700;

    letter-spacing: 0.035em;

    color: var(--color-ink);
    text-decoration: none;
    white-space: nowrap;
}

.primary-nav a:hover {
    color: var(--color-accent);
}

.primary-nav a::after {
    content: "";

    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;

    height: 2px;

    background: var(--color-accent);

    transform: scaleX(0);
    transform-origin: center;

    transition: transform var(--transition);
}

.primary-nav a:hover::after {
    transform: scaleX(1);
}


/* Accessibility */

.skip-link {
    position: fixed;

    top: 10px;
    left: 10px;

    z-index: 9999;

    padding: 10px 14px;

    background: var(--color-navy-dark);
    color: #fff;

    font-size: var(--text-sm);
    font-weight: 700;

    text-decoration: none;

    transform: translateY(-160%);
    transition: transform 150ms ease;
}

.skip-link:focus {
    transform: translateY(0);
}


/* Tablet */

@media (max-width: 900px) {

    .site-logo {
        font-size: 2.5rem;
    }

    .primary-nav__inner {
        justify-content: flex-start;

        overflow-x: auto;

        scrollbar-width: none;
    }

    .primary-nav__inner::-webkit-scrollbar {
        display: none;
    }
}


/* Mobile */

@media (max-width: 600px) {

    .site-header__utility-inner {
        min-height: 34px;
    }

    .site-header__utility {
        gap: 16px;
    }

    .site-header__utility a {
        font-size: 0.69rem;
    }

    .masthead {
        padding: 22px 0 20px;
    }

    .site-logo {
        font-size: 2.15rem;
    }

    .masthead__tagline {
        font-size: 0.62rem;
        letter-spacing: 0.09em;
    }

    .primary-nav a {
        font-size: 0.75rem;
    }
}