body { max-width: 760px; margin: 3rem auto; padding: 0 1.2rem; font: 17px/1.55 system-ui; color: #14232b; }
h1 { font-size: 2.5rem; line-height: 1; }
h2 { margin-top: 2rem; color: #123646; }
.rule { padding: 1rem; border-left: 5px solid #087e78; background: #dff1e9; }
code { background: #eef1ef; padding: .15rem .3rem; }
button { padding: .7rem 1rem; border: 0; border-radius: .5rem; background: #123646; color: white; }
@media print { button { display: none; } }