.app-topbar{display:flex;align-items:center;justify-content:space-between;height:48px;min-height:48px;padding:0 16px 0 10px;background:var(--surface);border-bottom:1px solid var(--border);flex-shrink:0;z-index:50}[data-theme=dark] .app-topbar{background:#1c1b1a;border-bottom-color:rgba(255,255,255,.06)}.app-topbar-left{display:flex;align-items:center;gap:16px}.app-topbar-sidebar-btn{display:flex;align-items:center;justify-content:center;width:32px;height:32px;background:none;border:none;border-radius:var(--radius);color:var(--text-dim);cursor:pointer;flex-shrink:0;transition:color .15s,background .15s}.app-topbar-sidebar-btn:hover{color:var(--text);background:var(--surface-2)}.app-topbar-lumenai{height:18px;width:auto}.app-topbar-logo-link{display:inline-flex;align-items:center;text-decoration:none;color:inherit;border-radius:var(--radius);transition:opacity .15s ease}.app-topbar-logo-link:hover{opacity:.75}.app-topbar-lumenai--dark,[data-theme=dark] .app-topbar-lumenai--light{display:none}[data-theme=dark] .app-topbar-lumenai--dark{display:block}.app-topbar-brand-divider{width:1px;height:16px;background:var(--border);flex-shrink:0}.app-topbar-brand-label{font-size:12px;font-weight:300;letter-spacing:.22em;text-transform:uppercase;color:var(--text-dim);white-space:nowrap}.app-topbar-right{display:flex;align-items:center}.app-topbar-vibia{height:14px;width:auto;flex-shrink:0}.app-topbar-vibia--dark,[data-theme=dark] .app-topbar-vibia--light{display:none}[data-theme=dark] .app-topbar-vibia--dark{display:block}@media (max-width:640px){.app-topbar-brand-divider,.app-topbar-brand-label{display:none}}.workspace{flex:1 1;overflow:hidden}.main-area,.workspace{display:flex;min-height:0}.main-area{flex-direction:column;flex:1 1;min-width:0}.main-body{display:flex;flex:1 1;min-height:0;overflow:hidden}.theme-toggle{background:none;border:1px solid var(--border);border-radius:var(--radius);color:var(--text-dim);cursor:pointer;padding:6px 8px;display:flex;align-items:center;justify-content:center;transition:all .3s ease;margin-left:auto;width:34px;height:34px}.theme-toggle:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.theme-toggle svg{width:16px;height:16px;transition:transform .4s cubic-bezier(.34,1.56,.64,1)}.theme-toggle:hover svg{transform:rotate(30deg)}.chat-header-actions{display:flex;align-items:center;gap:8px;margin-left:auto}.user-menu-wrapper{position:relative}.user-avatar-btn{width:30px;height:30px;border-radius:50%;background:var(--accent);color:var(--bg);font-size:11px;font-weight:700;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:opacity .15s ease;font-family:inherit}.user-avatar-btn:hover{opacity:.8}.user-menu{position:absolute;top:calc(100% + 8px);right:0;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:0 8px 32px rgba(0,0,0,.18);min-width:220px;z-index:1000;overflow:hidden;animation:fadeIn .12s ease}.user-menu-info{padding:14px 16px 12px;display:flex;flex-direction:column;gap:2px;border-bottom:1px solid var(--border-light)}.user-menu-label{font-size:11px;color:var(--text-muted);letter-spacing:.02em}.user-menu-name{font-size:13px;font-weight:600;color:var(--text)}.user-menu-email{font-size:11px;color:var(--text-dim)}.user-menu-logout{display:block;width:100%;text-align:left;padding:10px 16px;background:none;border:none;font-size:13px;font-family:inherit;color:var(--text-dim);cursor:pointer;transition:background .12s ease,color .12s ease}.user-menu-logout:hover{background:var(--surface);color:var(--text)}.mobile-topbar{display:none}@media (max-width:1280px){.mobile .app-sidebar,.mobile .app-topbar,.mobile .stage-control-bar{display:none!important}.main-body{flex:1 1}.mobile-topbar{display:flex;align-items:center;position:fixed;top:0;left:0;right:0;height:calc(52px + env(safe-area-inset-top));padding:env(safe-area-inset-top) calc(8px + env(safe-area-inset-right)) 0 calc(4px + env(safe-area-inset-left));z-index:150;background:var(--surface);border-bottom:1px solid var(--border);gap:4px}.mobile-topbar-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;background:none;border:none;border-radius:var(--radius);color:var(--text-dim);cursor:pointer;flex-shrink:0;transition:background .15s ease,color .15s ease}.mobile-topbar-btn:hover{color:var(--text)}.mobile-topbar-logo{height:15px;width:auto;flex:1 1;margin-left:4px}.mobile-topbar-logo--dark,[data-theme=dark] .mobile-topbar-logo--light{display:none}[data-theme=dark] .mobile-topbar-logo--dark{display:block;flex:1 1;height:15px;width:auto;margin-left:4px}.mobile-topbar-vibia{height:12px;width:auto;flex-shrink:0;margin-right:4px}.mobile-topbar-vibia--dark,[data-theme=dark] .mobile-topbar-vibia--light{display:none}[data-theme=dark] .mobile-topbar-vibia--dark{display:block;height:12px;width:auto;flex-shrink:0;margin-right:4px}.mobile-topbar-account{width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;font-size:12px;font-weight:600;font-family:inherit;border:none;cursor:pointer;flex-shrink:0;display:flex;align-items:center;justify-content:center}.mobile-history-backdrop{position:fixed;inset:0;z-index:300;background:rgba(0,0,0,.4);animation:mobile-backdrop-in .18s ease-out}.mobile-history-drawer{position:fixed;top:0;left:0;bottom:0;width:min(100vw,400px);padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom);padding-left:env(safe-area-inset-left);z-index:301;background:var(--surface);display:flex;flex-direction:column;overflow:hidden;box-shadow:4px 0 24px rgba(0,0,0,.2);animation:mobile-drawer-in .22s ease-out}@keyframes mobile-backdrop-in{0%{opacity:0}to{opacity:1}}@keyframes mobile-drawer-in{0%{transform:translateX(-100%)}to{transform:translateX(0)}}.mobile-history-drawer .sidebar-conversation{font-size:14px;padding:12px 10px}.mobile-history-drawer .sidebar-new-chat{font-size:14px;padding:10px 12px}.mobile-history-drawer .sidebar-search input{font-size:16px}.mobile-history-header{display:flex;align-items:center;justify-content:space-between;height:52px;padding:0 8px 0 16px;border-bottom:1px solid var(--border);flex-shrink:0}.mobile-history-title{font-size:15px;font-weight:600;color:var(--text)}.mobile-drawer-sessions{flex:1 1;overflow-y:auto;padding:0 6px}}