.site-header {
    width: auto;
    max-width: min(95%, 1440px);
    margin-top: 18px;
    padding: 12px 16px;
    border: 1px solid rgba(255,255,255,.9);
    border-radius: 18px;
    background: rgba(255,255,255,.86);
    box-shadow: 0 10px 35px rgba(24,55,76,.10);
    backdrop-filter: blur(16px);
    position: relative;
    z-index: 10;
}

.brand {
    flex-shrink: 0;
    padding: 4px 8px;
    border-radius: 12px;
}

.brand:hover { background: #f1f7fa; }
.brand-logo { width: 104px; }
.brand-product {
    padding-left: 11px;
    border-left: 1px solid var(--line);
    color: #40576a;
    font-size: .88rem;
    font-weight: 750;
    letter-spacing: .04em;
    text-transform: uppercase;
}

.topnav { gap: 5px; }
.topnav .nav-link,
.topnav .account-name,
.topnav .link-button {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    padding: 9px 12px;
    border-radius: 10px;
    transition: background .16s ease, color .16s ease, box-shadow .16s ease;
}

.topnav .nav-link { color: #40576a; font-weight: 650; }
.topnav .nav-link:hover,
.topnav .nav-link:focus-visible { background: #eaf3f7; color: var(--blue-dark); outline: none; }
.topnav .nav-link.active { background: var(--blue); color: #fff; box-shadow: 0 6px 16px rgba(11,93,140,.22); }
.topnav .account-name {
    margin-left: 7px;
    border-left: 1px solid var(--line);
    border-radius: 0;
    color: var(--muted);
    font-size: .82rem;
}
.topnav .link-button { padding: 9px 12px; }
.topnav .link-button:hover { background: #f9e9e9; color: #8c2525; }

@media (max-width: 900px) {
    .site-header { align-items: center; }
    .topnav { justify-content: flex-end; }
    .topnav .nav-link, .topnav .account-name, .topnav .link-button { min-height: 36px; padding: 7px 9px; }
}

@media (max-width: 680px) {
    .site-header { display: flex; width: auto; margin: 10px 12px 0; max-width: none; padding: 11px; }
    .brand { width: 100%; justify-content: center; }
    .brand-logo { width: 94px; }
    .topnav { width: 100%; justify-content: center; margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); }
    .topnav .nav-link { flex: 1 1 auto; justify-content: center; font-size: .82rem; }
    .topnav .account-name { width: 100%; justify-content: center; margin: 4px 0 0; border: 0; }
}