body{font-family:system-ui,-apple-system,sans-serif;margin:40px;line-height:1.55;color:#1f2430}
h1{color:#2563eb}
button{padding:9px 16px;border-radius:9px;border:1px solid #cbd2dc;background:#fff;cursor:pointer;font:inherit}
button:hover{background:#f3f6fb}
/* theme */
:root{--accent:#1f6feb;--ink:#1b2230;--bg:#ffffff;--muted:#5b6472}
body{color:var(--ink);background:var(--bg);font-family:system-ui,-apple-system,'Segoe UI',Roboto,sans-serif}