.site-menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 10px;
    border: 1px solid #dce3ea;
    border-radius: 10px;
    background: #fff;
    box-shadow: none;
    align-content: center;
    gap: 5px;
}
.site-menu-toggle:hover,
.site-menu-toggle:focus-visible { background: #eef8f7; }
.site-menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    margin: auto;
    border-radius: 99px;
    background: #1d3547;
    transition: transform .2s, opacity .2s;
}

@media (max-width: 900px) {
    .topbar { z-index: 50; }
    .site-menu-toggle { display: grid; margin-left: auto; }
    .topbar > nav {
        display: none;
        position: absolute;
        top: calc(100% + 1px);
        left: 16px;
        right: 16px;
        padding: 12px;
        background: #fff;
        border: 1px solid #dfe5ec;
        border-radius: 0 0 14px 14px;
        box-shadow: 0 18px 45px rgba(18, 36, 55, .16);
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
    }
    .topbar.menu-open > nav { display: flex; }
    .topbar > nav a,
    .topbar > nav a:not(.button),
    .topbar > nav .balance {
        display: flex;
        width: 100%;
        min-height: 44px;
        padding: 10px 12px;
        align-items: center;
        border-radius: 8px;
    }
    .topbar > nav a:hover { background: #eef8f7; }
    .topbar > nav .button { justify-content: center; margin-top: 4px; color: #fff; }
    .topbar.menu-open .site-menu-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .topbar.menu-open .site-menu-toggle span:nth-child(2) { opacity: 0; }
    .topbar.menu-open .site-menu-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

@media (max-width: 420px) {
    .brand { font-size: 22px; }
    .topbar > nav { left: 10px; right: 10px; }
}