.site-header{position:sticky;top:0;z-index:1000;background:var(--color-bg-darkest);border-bottom:1px solid var(--color-border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:var(--space-3)}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{height:48px;width:auto}
.brand-text{font-family:var(--font-heading);font-size:1.4rem;letter-spacing:.05em}

.nav-toggle{display:none;flex-direction:column;gap:4px;padding:10px;border:1px solid var(--color-border);border-radius:var(--radius-sm)}
.toggle-line{width:22px;height:2px;background:var(--color-text-primary)}

.site-nav{display:flex}
.nav-list{display:flex;gap:24px;align-items:center;list-style:none;margin:0;padding:0}
.nav-cta{padding:8px 14px;border:1px solid var(--color-accent);border-radius:var(--radius-sm)}
.nav-cta:hover{background:rgba(224,45,45,0.1)}

@media(max-width:900px){
.nav-toggle{display:flex}
.site-nav{position:absolute;top:100%;left:0;width:100%;background:var(--color-bg-darkest);border-bottom:1px solid var(--color-border);max-height:0;overflow:hidden;transition:max-height var(--transition-base)}
.site-nav.open{max-height:80vh}
.nav-list{flex-direction:column;align-items:flex-start;padding:16px}
.brand-mark{height:36px}
}