.site-header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 20;
    display: flex;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    padding: 1rem clamp(1rem, 4vw, 2.5rem);
    pointer-events: none;
}

.site-header .logo,
.site-header nav a,
.site-header nav button {
    pointer-events: auto;
}

.site-header .logo {
    color: var(--color-ink);
    font-size: 1.45rem;
    font-weight: 700;
    line-height: 1;
    text-decoration: none;
    text-transform: uppercase;
}

.site-header nav {
    display: flex;
    gap: 0.8rem;
    align-items: center;
}

.site-header nav a,
.site-header nav button {
    display: inline-flex;
    min-height: 2.45rem;
    align-items: center;
    justify-content: center;
    padding: 0.45rem 1rem;
    color: var(--color-ink);
    font-size: 1rem;
    font-weight: 700;
    font-family: inherit;
    text-decoration: none;
    background: var(--color-paper-soft);
    border: 1px solid var(--color-line);
    border-radius: 8px;
    box-shadow: var(--shadow-soft);
    cursor: pointer;
    transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.site-header nav a:hover,
.site-header nav a:focus-visible,
.site-header nav button:hover,
.site-header nav button:focus-visible {
    color: var(--color-white);
    background: var(--color-blue-900);
    transform: translateY(-1px);
}

@media (max-width: 520px) {
    .site-header {
        padding: 0.8rem 1rem;
    }

    .site-header .logo {
        font-size: 1.15rem;
    }

    .site-header nav a,
    .site-header nav button {
        min-height: 2.25rem;
        padding-inline: 0.8rem;
        font-size: 0.95rem;
    }
}