:root{--primary:#2aabee;--bg-primary:#e5e5ea;--bg-secondary:#fff;--message-incoming:#fff;--message-outgoing:#dcf8c6;--text-primary:#000;--text-secondary:#6b7280;--border-light:#e0e0e0;--radius-sm:6px;--radius:18px;--shadow-sm:0 1px 2px rgba(0,0,0,.08);--shadow:0 2px 4px rgba(0,0,0,.1);--transition:all .2s ease}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-primary);background-image:linear-gradient(hsla(0,0%,100%,.8) 1px,transparent 0),linear-gradient(90deg,hsla(0,0%,100%,.8) 1px,transparent 0);background-size:20px 20px;color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,sans-serif;line-height:1.4;-webkit-font-smoothing:antialiased;min-height:100vh}