*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,'Noto Sans','Apple Color Emoji','Segoe UI Emoji','Segoe UI Symbol';line-height:1.6}
header{padding:2.5rem 1.25rem;background:#f6f7f9;border-bottom:1px solid #e6e8eb}
h1{margin:0 0 .5rem 0;font-size:clamp(24px,4vw,36px)}
main{max-width:900px;margin:0 auto;padding:2rem 1.25rem;display:grid;gap:1rem}
.card{border:1px solid #e6e8eb;border-radius:16px;padding:1.25rem;background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.04)}
code{background:#f3f4f6;border:1px solid #e5e7eb;border-radius:6px;padding:.1rem .35rem;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace}
footer{text-align:center;color:#6b7280;padding:2rem 1.25rem;border-top:1px solid #e6e8eb}