/* ── Site header ────────────────────────────────────────────────────── */
.site-header {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    height: var(--header-h);
    padding: env(safe-area-inset-top, 0px) var(--space-5) 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    user-select: none;
}
.site-header__logo  { width: 1.125rem; height: 1.125rem; line-height: 1; flex-shrink: 0; }
.site-header__brand {
    display: flex;
    align-items: baseline;
    gap: 0.625rem;
    line-height: 1;
}
.site-header__title {
    font-size: var(--text-sm);
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--text);
}
.site-header__sep { color: var(--text-muted); font-size: var(--text-xs); }
.site-header__sub {
    font-size: var(--text-xs);
    color: var(--text-dim);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
/* The smaller capitals need a slight optical lift beside the title. */
@media (min-width: 768px) {
    .site-header__brand .site-header__sub {
        position: relative;
        top: -0.5px;
    }
}
.site-header__nav   { margin-left: auto; flex-shrink: 0; display: flex; gap: var(--space-1); align-items: center; }
.site-header__link  {
    padding: var(--space-1) 0.625rem;
    border-radius: var(--r-sm);
    border: none;
    background: none;
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--text-dim);
    transition: background var(--tr), color var(--tr);
    white-space: nowrap;
}
.site-header__link:hover { background: var(--surface-2); color: var(--text); }
.site-header__link--icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: min(var(--control-h-sm), 12vw);
    height: var(--control-h-sm);
    padding: 0;
}
.site-header__link--icon svg { opacity: 0.85; }
.site-header__link--icon:hover svg { opacity: 1; }