.site-header {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(243, 237, 226, 0.16);
    color: var(--color-ivory);
}

.nav-shell {
    display: flex;
    width: min(calc(100% - 2rem), var(--container-wide));
    min-height: 5.4rem;
    margin-inline: auto;
    align-items: center;
    justify-content: space-between;
}

.brand { display: inline-flex; align-items: center; gap: 0.75rem; text-decoration: none; }
.brand-mark { display: grid; width: 2.7rem; height: 2.7rem; border: 1px solid var(--color-brass); place-items: center; transform: rotate(45deg); }
.brand-mark span { color: var(--color-brass-soft); font-family: var(--font-display); font-size: 0.8rem; transform: rotate(-45deg); }
.brand-type { display: flex; flex-direction: column; line-height: 1; }
.brand-type strong { font-family: var(--font-display); font-size: 1.15rem; font-weight: 400; letter-spacing: 0.02em; }
.brand-type small { margin-top: 0.25rem; color: var(--color-brass-soft); font-size: 0.52rem; font-weight: 700; letter-spacing: 0.22em; text-transform: uppercase; }

.nav-toggle {
    position: relative;
    z-index: 2;
    width: 3rem;
    height: 3rem;
    border: 1px solid rgba(243, 237, 226, 0.25);
    background: transparent;
    color: inherit;
    cursor: pointer;
}

.nav-toggle-lines, .nav-toggle-lines::before, .nav-toggle-lines::after { position: absolute; width: 1.25rem; height: 1px; background: currentColor; content: ""; transition: transform var(--transition), opacity var(--transition); }
.nav-toggle-lines { top: 50%; left: 50%; transform: translate(-50%, -50%); }
.nav-toggle-lines::before { transform: translate(-0.625rem, -0.38rem); }
.nav-toggle-lines::after { transform: translate(-0.625rem, 0.38rem); }
.nav-toggle[aria-expanded="true"] .nav-toggle-lines { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-lines::before { transform: translateX(-0.625rem) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-lines::after { transform: translateX(-0.625rem) rotate(-45deg); }

.site-navigation {
    position: fixed;
    inset: 0;
    display: flex;
    padding: 7rem 1.5rem 2rem;
    background: var(--color-black);
    flex-direction: column;
    visibility: hidden;
    opacity: 0;
    transition: opacity var(--transition), visibility var(--transition);
}

.site-navigation.is-open { visibility: visible; opacity: 1; overflow-y: auto; }
.site-navigation ul { display: flex; margin: 0 0 2rem; padding: 0; flex-direction: column; list-style: none; }
.site-navigation li { border-bottom: 1px solid rgba(243, 237, 226, 0.12); }
.site-navigation li a { display: block; padding: 0.85rem 0; font-family: var(--font-display); font-size: clamp(1.5rem, 7vw, 2.3rem); text-decoration: none; }

/* Full header needs ~806px plus gutters, scrollbar, and separation. */
@media (min-width: 58rem) {
    .nav-shell > .brand, .site-navigation { flex-shrink: 0; }
    .site-navigation a { white-space: nowrap; }
    .nav-shell { width: min(calc(100% - 4rem), var(--container-wide)); }
    .nav-toggle { display: none; }
    .site-navigation { position: static; display: flex; padding: 0; background: transparent; flex-direction: row; align-items: center; gap: 2rem; visibility: visible; opacity: 1; }
    .site-navigation ul { margin: 0; flex-direction: row; gap: 1.65rem; }
    .site-navigation li { border: 0; }
    .site-navigation li a { position: relative; padding: 1.8rem 0; font-family: var(--font-body); font-size: 0.7rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; }
    .site-navigation li a::after { position: absolute; right: 0; bottom: 1.45rem; left: 0; height: 1px; background: var(--color-brass); content: ""; transform: scaleX(0); transform-origin: right; transition: transform var(--transition); }
    .site-navigation li a:hover::after { transform: scaleX(1); transform-origin: left; }
}