:root{--bg:#fafaf8;--bg-chat:#fff;--bg-input:#f5f5f2;--text-primary:#1a1a18;--text-secondary:#6b6b63;--text-muted:#9c9c93;--accent:#2d2d2a;--accent-soft:#e8e8e3;--border:#e5e5df;--user-bubble:#2d2d2a;--user-text:#fafaf8;--assistant-bubble:transparent;--assistant-text:#1a1a18;--error:#b5453a;--success:#4a7c59}*{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--bg);height:100%;color:var(--text-primary);-webkit-font-smoothing:antialiased;font-family:DM Sans,-apple-system,sans-serif}::selection{background:var(--accent);color:var(--user-text)}.app-shell{min-height:100vh}.app-shell__visual{display:none}.app-shell__content{min-width:0}@media (min-width:1024px){.app-shell{grid-template-columns:clamp(300px,34vw,520px) minmax(0,1fr);height:100vh;display:grid;overflow:hidden}.app-shell__visual{border-right:1px solid var(--border);height:100vh;display:block;position:sticky;top:0;overflow:hidden}.app-shell__content{height:100vh;overflow-y:auto}}@keyframes skeleton-pulse{0%,to{opacity:.6}50%{opacity:1}}