.topnav {
    position: sticky;
    top: 0;
    z-index: 100;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
    padding: 0 40px;
    border-bottom: 1px solid var(--hair);
    background: var(--bg);
    color: var(--fg);
    font-family: var(--mono);
}

.topnav .brand {
    flex: 0 0 auto;
    color: var(--fg);
    font-size: .95rem;
    font-weight: 800;
    letter-spacing: 2px;
    line-height: 1;
    text-decoration: none;
}

.topnav .brand .dot { color: var(--muted); }

.topnav .links {
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 28px;
    color: var(--fg);
    font-size: .78rem;
    letter-spacing: .4px;
}

.topnav .links a {
    flex: 0 0 auto;
    padding: 7px 0;
    border-bottom: 1px solid transparent;
    color: inherit;
    line-height: 1;
    text-decoration: none;
}

.topnav .links a:hover,
.topnav .links a:focus-visible,
.topnav .links a[aria-current="page"] {
    border-bottom-color: currentColor;
}

.topnav .links a:focus-visible,
.topnav .brand:focus-visible,
.topnav .theme-toggle:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 4px;
}

.topnav .theme-toggle { flex: 0 0 auto; }

@media (max-width: 820px) {
    .topnav {
        min-height: 0;
        flex-wrap: wrap;
        gap: 10px;
        padding: 14px 18px 12px;
    }

    .topnav .links {
        width: 100%;
        justify-content: flex-start;
        gap: 20px;
        overflow-x: auto;
        padding: 0 0 3px;
        white-space: nowrap;
        scrollbar-width: none;
    }

    .topnav .links::-webkit-scrollbar { display: none; }
}

@media (max-width: 560px) {
    .topnav { padding-inline: 16px; }
    .topnav .brand { font-size: .9rem; }
    .topnav .links { gap: 16px; font-size: .74rem; }
}