* { box-sizing: border-box; }
body { margin: 0; font: 17px/1.5 system-ui, sans-serif; background: #f3f4f6; color: #111; }
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 28px; margin: 0 0 12px; }
h2 { font-size: 20px; margin: 28px 0 8px; }
a { color: #0b3d91; }
.back { display: inline-block; margin-bottom: 14px; }
.note { background: #fff6d6; border-radius: 8px; padding: 10px 14px; margin: 14px 0; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
code { background: #e6e8eb; padding: 1px 5px; border-radius: 4px; }