:root{--color-text:#0f172a;--color-muted:#64748b;--color-bg:#ffffff;--color-accent:#2563eb}*{box-sizing:border-box}body,html{margin:0;padding:0}body{color:var(--color-text);background:var(--color-bg);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}h1{font-size:clamp(1.75rem,4vw,2.5rem);line-height:1.15;margin:0 0 .5rem}a{color:var(--color-accent)}