:root{--bg:#f4f6f8;--card:#fff;--accent:#2b6cb0}
*{box-sizing:border-box}
html,body{height:100%;min-height:100%}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;margin:0;background:var(--bg);color:#111;min-height:100vh;height:calc(var(--vh,1vh)*100)}
nav.sticky{z-index:20}
/* common utilities */
.rounded-2xl{border-radius:1rem}
.rounded-3xl{border-radius:1.5rem}

/* small helper */
.hidden{display:none}