.site-nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    height: var(--nav-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 3rem;
    background: rgba(245,250,251,.94);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--ink-10);
    transition: background var(--transition), box-shadow var(--transition);
}
.site-nav.scrolled {
    background: rgba(245,250,251,.98);
    box-shadow: var(--shadow-sm);
}
.nav-logo {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -.01em;
    color: var(--ink);
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-logo-mark {
    width: 32px;
    height: 32px;
    background: var(--primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: .75rem;
    font-weight: 800;
    letter-spacing: .04em;
    flex-shrink: 0;
}
.nav-links {
    display: flex;
    gap: .25rem;
    list-style: none;
    align-items: center;
}
.nav-links a {
    font-size: .78rem;
    font-weight: 500;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--ink-60);
    padding: .45rem .85rem;
    border-radius: var(--radius-sm);
    transition: color var(--transition), background var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: var(--teal-50);
}
.lang-toggle {
    display: flex;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.nav-lang-mobile { display: none; list-style: none; }
.lang-btn {
    padding: 5px 12px;
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: var(--sans);
    font-size: .72rem;
    font-weight: 600;
    letter-spacing: .06em;
    color: var(--ink-60);
    transition: all var(--transition);
}
.lang-btn.active  { background: var(--primary); color: #fff; }
.lang-btn:hover:not(.active) { background: var(--teal-50); color: var(--primary); }
.nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 6px;
    background: none;
    border: none;
}
.nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: all var(--transition);
}
@media (max-width: 900px) {
    .site-nav { padding: 0 1.25rem; width: 100%; box-sizing: border-box; }
    .nav-hamburger { display: flex; }
    .lang-toggle-desktop { display: none; }
    .nav-logo-mark { display: none; }
    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-h);
        left: 0; right: 0;
        flex-direction: column;
        gap: 0;
        background: rgba(245,250,251,.98);
        border-bottom: 1px solid var(--border);
        padding: .5rem 0;
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: .85rem 1.5rem; border-radius: 0; width: 100%; }
    .nav-lang-mobile {
        display: flex;
        align-items: center;
        gap: 0;
        padding: .75rem 1.5rem;
        border-top: 1px solid var(--border);
        margin-top: .25rem;
    }
    .nav-lang-mobile .lang-btn {
        padding: 6px 16px;
        font-size: .8rem;
    }
}