:root {
    --site-bg:#f3f6f8;
    --site-panel:#ffffff;
    --site-text:#1f2933;
    --site-muted:#617080;
    --site-border:#d9e1e8;
    --site-accent:#0b5cab;
}

.site-topbar {
    background: var(--site-panel);
    border-bottom: 1px solid var(--site-border);
    box-shadow: 0 1px 5px rgba(0,0,0,.04);
}

.site-topbar-inner {
    max-width: 1500px;
    margin: 0 auto;
    padding: 10px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.site-brand {
    color: var(--site-text);
    font-weight: bold;
    text-decoration: none;
    white-space: nowrap;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
    justify-content: flex-end;
}

.site-nav a {
    color: var(--site-muted);
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: 6px;
    padding: 6px 9px;
    font-size: .88rem;
    line-height: 1.2;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--site-accent);
    border-color: #b8d7f1;
    background: #eef6ff;
}

.content-panel {
    background: var(--site-panel);
    border: 1px solid var(--site-border);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,.05);
}

@media (max-width: 720px) {
    .site-topbar-inner {
        display: block;
    }

    .site-brand {
        display: block;
        margin-bottom: 8px;
    }

    .site-nav {
        justify-content: flex-start;
    }
}