.lab-site .site-header { border-bottom: 1px solid var(--color-border); }
.lab-site .header-inner { max-width: var(--container-width); margin: 0 auto; padding: 22px var(--gutter); display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.lab-site .logo { display: flex; flex-shrink: 0; margin-left: 15px; }
.lab-site .logo-mark { width: 140px; height: auto; display: block; overflow: visible; }
.lab-site .logo-mark-main { font-family: var(--font-base); font-size: 34px; font-weight: 400; letter-spacing: 0.16em; fill: var(--color-text); }
.lab-site .logo-mark-sub { font-family: var(--font-base); font-size: 12px; font-weight: 500; letter-spacing: 0.28em; fill: var(--color-muted); }
.lab-site .nav-toggle-checkbox { display: none; }
.lab-site .main-nav { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.lab-site .main-nav .nav-row { display: flex; gap: 36px; }
.lab-site .main-nav .nav-row a { font-size: 11.5px; font-weight: 300; letter-spacing: 0.13em; white-space: nowrap; }
.lab-site .header-actions { display: flex; align-items: center; gap: 22px; flex-shrink: 0; margin-right: 8px; }
.lab-site .action-item { display: flex; align-items: center; gap: 2px; font-size: 9px; letter-spacing: 0.05em; white-space: nowrap; }
.lab-site .action-item span { display: none; }
.lab-site .action-item svg { width: 23px; height: 23px; flex-shrink: 0; stroke-width: 1.4; }
.lab-site .menu-toggle { display: none; cursor: pointer; }
.lab-site .menu-toggle svg { width: 24px; height: 24px; }

@media (max-width: 768px) {
	.lab-site .header-inner { padding: 16px 16px; position: relative; }
	.lab-site .logo-mark { width: 96px; }
	.lab-site .main-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: #ffffff; border-bottom: 1px solid var(--color-border); padding: 20px 0; gap: 14px; z-index: 20; }
	.lab-site .main-nav .nav-row { flex-wrap: wrap; justify-content: center; gap: 24px; }
	.lab-site .main-nav .nav-row a { font-size: 11px; font-weight: 400; }
	.lab-site .nav-toggle-checkbox:checked ~ .main-nav { display: flex; }
	.lab-site .action-item span { display: none; }
	.lab-site .header-actions { gap: 14px; margin-right: 0; }
	.lab-site .action-item svg { width: 20px; height: 20px; }
	.lab-site .menu-toggle { display: flex; }
	.lab-site .menu-toggle svg { width: 20px; height: 20px; }
}