.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);

    height: var(--header-height);
    width: 100%;
    padding: var(--space-3) clamp(var(--space-4), 4vw, var(--space-12));

    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);

    background: var(--color-bg-translucent);
    backdrop-filter: blur(var(--blur-regular))
        saturate(var(--saturate-vibrancy));
    -webkit-backdrop-filter: blur(var(--blur-regular))
        saturate(var(--saturate-vibrancy));

    opacity: 0;
    pointer-events: none;

    transition: opacity 0.3s var(--ease-standard);
}

.site-header.site-header-stuck {
    opacity: 1;
    pointer-events: auto;
}

.site-header.site-header-hidden {
    opacity: 0;
    pointer-events: none;
}

.site-header-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-width: 0;
}

.site-header-icon {
    height: 100%;
    max-height: 64px;
    width: auto;
    display: block;
    flex-shrink: 0;
}

.site-header-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.site-header-title {
    font-family: var(--font-sans);
    font-size: var(--text-headline);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    margin: 0;
    line-height: 1.1;
    letter-spacing: var(--tracking-tight);
}

.site-header-subtitle {
    font-size: var(--text-subhead);
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.2;
    max-width: none;
}

.site-header-cta {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
}

.site-header-cta-note {
    font-size: var(--text-subhead);
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.2;
    text-align: right;
    max-width: none;
}

.site-header-cta-note-aside {
    color: var(--color-text-tertiary, var(--color-text-secondary));
    opacity: 0.7;
}

@media (prefers-reduced-motion: reduce) {
    .site-header {
        transition: none;
    }
}