@media (max-width:768px){.nav,.nav a{border-bottom:1px solid var(--line)}.header-inner{height:64px;padding:0 16px;gap:16px}.nav{position:fixed;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:16px 0;gap:0;transform:translateY(-110%);transition:transform .35s;box-shadow:0 16px 32px rgba(15,23,42,.08)}.nav.open{transform:translateY(0)}.nav a{padding:14px 24px;font-size:16px}.nav a:last-child{border-bottom:0}.nav-toggle{display:block}.brand-sub{display:none}.brand-name{font-size:14px}.brand-mark{width:36px;height:36px;font-size:18px}.container{padding:0 20px}.section{padding:72px 0}.section-head{margin-bottom:48px}.section-lead{font-size:16px}.footer-inner{padding:0 20px}.footer-contact{grid-template-columns:1fr;gap:12px}.btn{height:48px;padding:0 24px;font-size:15px}}