.site-header {
    position: sticky;
    top: 0;
    background: var(--color-surface);
    z-index: 40;
    box-shadow: 0 2px 6px rgba(2, 6, 23, 0.04);
}

.site-header .inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 14px 24px
}

.site-logo {
    color: var(--color-primary);
    font-weight: 700;
    font-size: 18px
}

.site-nav a {
    color: var(--color-text);
    text-decoration: none;
    margin-left: 14px;
    position: relative
}

.site-nav a:hover {
    color: var(--color-primary)
}

.nav-underline::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -4px;
    height: 2px;
    background: transparent;
    transition: background 180ms ease
}

.site-nav a:hover::after {
    background: var(--color-accent)
}

@media(max-width:768px) {
    .site-header .inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px
    }

    .site-nav {
        display: flex;
        gap: 8px;
        flex-wrap: wrap
    }

    .site-nav a {
        margin-left: 0
    }
}

@media(max-width:420px) {
    .site-header .inner {
        padding: 10px
    }

    .site-logo {
        font-size: 15px
    }
}