:root{--bg: #f6f8fa;--card: #ffffff;--text: #0f172a}html,body,#root{height:100%;margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial;background:var(--bg);color:var(--text)}.app{width:100%;margin:0;padding:0}.app-header{background:var(--card);padding:20px;border-radius:8px;box-shadow:0 1px 3px #0c11170f}