.youyu-logo{display:block;width:42px;height:42px;object-fit:contain;flex-shrink:0}
.nav-brand .youyu-logo{width:48px;height:48px;background:#fff;border-radius:10px;padding:4px;box-sizing:border-box}
.topbar .brand .youyu-logo{width:30px;height:30px}
.help-header .youyu-logo{width:44px;height:44px}
@media(max-width:767px){.topbar .brand{gap:7px}.topbar .brand .youyu-logo{width:28px;height:28px}}