:root {
    --header-background: #111827;
    --header-text: #f9fafb;
    --header-muted: #cbd5e1;
    --header-border: #334155;
    --focus-ring: #93c5fd;
}

.site-skip-link {
    position: absolute;
    top: 0;
    left: 1rem;
    z-index: 1000;
    padding: 0.75rem 1rem;
    background: #ffffff;
    color: #111827;
    transform: translateY(-150%);
}

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

.site-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--header-background);
    border-bottom: 1px solid var(--header-border);
    color: var(--header-text);
}

.site-brand {
    color: var(--header-text);
    font-weight: 700;
    text-decoration: none;
}

.site-header button,
.site-header a {
    outline-offset: 0.25rem;
}

    .site-header button:focus-visible,
    .site-header a:focus-visible {
        outline: 3px solid var(--focus-ring);
    }

.navigation-toggle {
    margin-left: auto;
}

.primary-navigation {
    flex-basis: 100%;
    display: none;
}

    .primary-navigation[data-open] {
        display: block;
    }

    .primary-navigation ul {
        margin: 0;
        padding: 0;
        list-style: none;
    }

    .primary-navigation a {
        display: block;
        padding: 0.75rem 0;
        color: var(--header-muted);
        text-decoration: none;
    }

        .primary-navigation a:hover,
        .primary-navigation a[aria-current="page"] {
            color: var(--header-text);
            text-decoration: underline;
            text-underline-offset: 0.3rem;
        }

.navigation-logout-form {
    margin: 0;
}

.navigation-logout-button {
    display: block;
    width: 100%;
    padding: 0.75rem 0;
    border: 0;
    background: transparent;
    color: var(--header-muted);
    font: inherit;
    text-align: left;
    text-decoration: none;
    cursor: pointer;
}

    .navigation-logout-button:hover {
        color: var(--header-text);
        text-decoration: underline;
        text-underline-offset: 0.3rem;
    }

    .navigation-logout-button:focus-visible {
        outline: 3px solid var(--focus-ring);
        outline-offset: 0.25rem;
    }

.theme-toggle {
    white-space: nowrap;
}

@media (min-width: 56rem) {
    .site-header {
        flex-wrap: nowrap;
    }

    .navigation-toggle {
        display: none;
    }

    .primary-navigation {
        display: block;
        flex-basis: auto;
        margin-left: auto;
    }

        .primary-navigation ul {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .primary-navigation a {
            padding: 0.5rem 0;
        }

    .navigation-logout-button {
        width: auto;
        padding: 0.5rem 0;
        text-align: left;
    }
}