:root --ink:#0f172a; --muted:#475569; --line:#e2e8f0; --bg:#ffffff; --brand:#0ea5e9; * box-sizing: border-box; body margin:0; font-family: system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif; color:var(--ink); background:var(--bg); line-height:1.7; .wrap max-width: 1160px; margin: 0 auto; padding: 40px 20px 64px;