@media (max-width: 980px){.app-shell{grid-template-columns:1fr}.sidebar{display:none}.content-panel{padding:18px 16px calc(var(--mobile-nav-h) + 28px)}.topbar{padding:16px;align-items:flex-start}.topbar-actions{flex-wrap:wrap;justify-content:flex-end}.mobile-nav{position:fixed;left:12px;right:12px;bottom:12px;z-index:10;height:var(--mobile-nav-h);display:flex;gap:8px;align-items:center;justify-content:space-around;padding:8px;border:1px solid var(--line);border-radius:24px;background:rgba(5,9,20,.86);backdrop-filter:blur(18px);box-shadow:var(--shadow)}.mobile-nav-item{font-size:.78rem;color:var(--muted);padding:10px 8px;border-radius:14px}.mobile-nav-item.active{color:var(--text);background:rgba(53,167,255,.12)}}@media (max-width: 560px){.topbar{display:grid}.topbar-actions{justify-content:flex-start}.profile-chip{max-width:100%;overflow:hidden;text-overflow:ellipsis}.auth-page{padding:14px}.auth-card{padding:20px}.cards-grid{grid-template-columns:1fr}}@media (orientation: landscape) and (max-height: 520px){.mobile-nav{height:56px}.content-panel{padding-bottom:78px}.topbar{position:relative}}