*{box-sizing:border-box}body,html{margin:0;padding:0;background:#f4f5f3}body{min-height:100vh;min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:24px}.chat-shell{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;width:100%;max-width:560px;margin:0 auto;background:#ffffff;border-radius:16px;border:1px solid #e4e6e1;overflow:hidden;display:flex;flex-direction:column;height:640px;box-shadow:0 1px 3px rgba(0,0,0,.06)}@media (max-width:640px){body{padding:0}.chat-shell{max-width:100%;height:100vh;height:100dvh;border-radius:0;border:none;box-shadow:none}}