.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255,255,255,.94);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 20px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 600; color: var(--blue-900); }
.brand-mark { width: 42px; height: 42px; border-radius: 50%; background: linear-gradient(135deg, var(--blue-700), var(--cyan-600)); display: grid; place-items: center; color: white; font-weight: 600; }
.main-nav { display: flex; align-items: center; gap: 18px; color: var(--muted); font-weight: 600; font-size: 14px; }
.main-nav a:hover { color: var(--blue-700); }
.mobile-menu-toggle { display: none; }
.site-footer { margin-top: 72px; padding: 40px 0 88px; background: var(--blue-900); color: white; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 24px; }
.footer-credit { margin-top: 24px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.18); color: rgba(255,255,255,.72); font-size: 13px; }
.mobile-bottom-nav {
    display: none;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 40;
    background: white;
    border-top: 1px solid var(--line);
    box-shadow: 0 -12px 28px rgba(11, 47, 107, .12);
}
.mobile-bottom-nav a { flex: 1; min-height: 60px; display: grid; place-items: center; gap: 2px; color: var(--muted); font-size: 11px; font-weight: 600; }
.mobile-bottom-nav .primary { color: var(--blue-700); }
@media (max-width: 820px) {
    .main-nav, .header-action { display: none; }
    .mobile-menu-toggle { display: inline-flex; }
    .mobile-bottom-nav { display: flex; }
    .footer-grid { grid-template-columns: 1fr; }
}