:root{--ink:#15151a;--muted:#6f707b;--line:#e8e8ed;--panel:#f7f7f9;--paper:#ffffff;--accent:#c79a6b;--accent-dark:#9b7048;--soft-accent:#f8efe6;--shadow:0 22px 70px rgba(21,21,26,0.12)}*{box-sizing:border-box}body,html{margin:0;min-height:100%;background:var(--paper);color:var(--ink)}body{font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,textarea{font:inherit}button{cursor:pointer}.app-shell{display:flex;width:100%;height:100dvh;overflow:hidden;background:var(--paper)}.sidebar{width:286px;flex:0 0 286px;height:100%;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:20px 14px 16px;z-index:30}.brand-row{display:flex;align-items:center;gap:11px;padding:0 8px 20px}.brand-mark{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;background:#181512;box-shadow:0 8px 20px rgba(66,45,28,.16);overflow:hidden}.brand-mark img{width:25px;height:25px;object-fit:contain}.brand-row 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11px;border-radius:9px;font-size:10px;line-height:1.45}.auth-alert.error{color:#9f3340;background:#fff1f2;border:1px solid #ffd6da}.auth-alert.success{color:#23734a;background:#edf9f2;border:1px solid #ccebd8}@media (max-width:760px){.mobile-only{display:grid}.sidebar{position:fixed;left:0;top:0;transform:translateX(-105%);transition:transform .22s ease;box-shadow:var(--shadow)}.sidebar-open{transform:translateX(0)}.sidebar-scrim{display:block;position:fixed;inset:0;border:0;background:rgba(20,20,25,.34);z-index:25}.brand-row .mobile-only{margin-left:auto}.topbar{padding:0 13px;justify-content:flex-start;gap:8px}.topbar-note{display:none}.model-trigger{max-width:calc(100vw - 72px)}.welcome{min-height:calc(100dvh - 205px);padding-top:25px}.welcome h1{font-size:36px}.suggestion-grid{grid-template-columns:1fr}.suggestion-grid button:nth-child(n+3){display:none}.composer-zone{padding:8px 11px 12px}.messages{width:calc(100% - 28px)}.message{grid-template-columns:30px 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