*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f0f2f5;--surface: #ffffff;--border: #e5e7eb;--primary: #E40000;--primary-dark: #25262D;--text: #111827;--text-muted: #6b7280;--bubble-in: #ffffff;--bubble-out: #ffe8e8;--sidebar-w: 340px;--header-h: 56px;--radius: 8px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}body{font-family:var(--font);background:var(--bg);color:var(--text);height:100dvh;overflow:hidden}#root{height:100dvh;display:flex;flex-direction:column}button{cursor:pointer;border:none;background:none;font:inherit}input,textarea,select{font:inherit}