body,html{margin:0;padding:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Noto Sans,Ubuntu,Cantarell,Helvetica Neue,Arial,Apple Color Emoji,Segoe UI Emoji}a{color:#2563eb;text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{line-height:1.25}.container{max-width:960px;margin:0 auto;padding:24px}.card{padding:16px;border:1px solid #e5e7eb;border-radius:10px}.grid{display:grid;grid-gap:12px;gap:12px}code{background:#f3f4f6;padding:3px 6px;border-radius:6px}button{cursor:pointer}