.site-header {
    background-color: rgba(251, 251, 253, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 18px 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    font-weight: 700;
    font-size: 20px;
    color: var(--text-main);
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 24px;
}

.main-nav a {
    color: var(--text-main);
    font-size: 14px;
    font-weight: 500;
}

.main-nav a[aria-current="page"] {
    color: var(--accent);
}