:root{color-scheme:light}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f7f7f7;color:#222}main{max-width:960px;margin:0 auto;background:#fff;border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,.08)}