.site-header{background:#fff;border-bottom:1px solid var(--brand-border)}.chem-navbar{position:relative;min-height:80px;background:#fff}.brand-logo{width:180px;height:40px;-o-object-fit:contain;object-fit:contain;border:1px dashed rgba(31,39,55,.25)}.nav-link{color:var(--brand-primary-dark);font-weight:700}.nav-search{gap:8px}.nav-search .form-control{width:170px;border-radius:var(--brand-radius)}.chem-mega-panel{display:none;position:absolute;top:80px;left:0;right:0;z-index:12;padding:26px 0;background:#fff;border-top:1px solid var(--brand-border);border-bottom:1px solid var(--brand-border);box-shadow:var(--shadow-soft)}.chem-navbar:hover .chem-mega-panel{display:block}.mega-label{display:block;margin-bottom:10px;color:var(--brand-secondary);font-size:.78rem;font-weight:800;text-transform:uppercase}.mega-link-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:10px;gap:10px}.mega-link-grid a{padding:12px;border:1px solid var(--brand-border);border-radius:var(--brand-radius)}.mega-footer{padding:56px 0 28px;color:var(--text-on-dark);background:var(--brand-primary-dark)}.footer-bottom,.footer-brand-row{display:flex;justify-content:space-between;gap:24px;align-items:center}.footer-brand-row{padding-bottom:28px;border-bottom:1px solid rgba(255,255,255,.16)}.footer-brand-row strong{display:block;font-size:1.6rem}.footer-bottom,.footer-brand-row p{color:rgba(255,255,255,.72)}.footer-action{color:var(--text-on-dark);font-weight:800;border-bottom:1px solid var(--brand-accent)}.footer-matrix{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-gap:28px;gap:28px;padding:36px 0}.footer-matrix h3{color:var(--text-on-dark);font-size:.95rem}.footer-matrix a{display:block;margin:7px 0;color:rgba(255,255,255,.72)}.footer-matrix a:hover{color:var(--brand-accent)}.footer-bottom{padding-top:22px;border-top:1px solid rgba(255,255,255,.16);font-size:.9rem}@media (max-width:991px){.chem-navbar:hover .chem-mega-panel{display:none}.footer-matrix{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-bottom,.footer-brand-row{align-items:flex-start;flex-direction:column}}@media (max-width:575px){.footer-matrix,.mega-link-grid{grid-template-columns:1fr}}