.site-header-app {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(7, 11, 21, 0.78);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
}

.site-header-app .shell-width {
    padding: 1rem 0;
}

.site-header-app .header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.app-shell .brand-mark {
    font-weight: 700;
    letter-spacing: 0.01em;
}

.site-header-app .header-nav {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.site-header-app .header-nav a {
    color: var(--text-muted);
    padding: 0.55rem 0.8rem;
    border-radius: 999px;
}

.site-header-app .header-nav a:hover {
    color: var(--text);
    background: rgba(124, 156, 255, 0.12);
}

.app-shell .site-footer {
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    padding: var(--space-5) 0;
}

.app-shell .footer-row {
    display: flex;
    justify-content: space-between;
    gap: var(--space-3);
    flex-wrap: wrap;
}