:root {
  color: #18221f;
  background: #f4f7f6;
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans JP", sans-serif;
  line-height: 1.8;
}

* { box-sizing: border-box; }
body { margin: 0; }
.site-header, main, footer { width: min(920px, calc(100% - 32px)); margin-inline: auto; }
.site-header { padding: 28px 0 20px; }
.site-header a { color: inherit; font-size: 18px; font-weight: 700; text-decoration: none; }
main { padding-bottom: 32px; }
article { padding: clamp(24px, 5vw, 56px); border: 1px solid #d9e2df; border-radius: 18px; background: #fff; box-shadow: 0 12px 38px rgb(24 34 31 / 7%); }
h1 { margin: 0 0 30px; font-size: clamp(26px, 5vw, 38px); line-height: 1.35; }
h2 { margin: 42px 0 14px; padding-top: 18px; border-top: 1px solid #d9e2df; font-size: 21px; line-height: 1.5; }
h3 { margin: 30px 0 10px; font-size: 17px; }
p, ul, ol { margin: 12px 0; }
li + li { margin-top: 7px; }
a { color: #087f70; text-underline-offset: 3px; }
code { padding: 2px 5px; border-radius: 4px; background: #edf3f1; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em; }
blockquote { margin: 24px 0; padding: 12px 18px; border-left: 4px solid #198f7f; background: #f2f8f6; color: #4c5a56; }
blockquote p { margin: 0; }
.table-scroll { margin: 22px 0; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { min-width: 150px; padding: 12px 14px; border: 1px solid #d9e2df; text-align: left; vertical-align: top; }
th { background: #edf3f1; }
footer { padding: 10px 0 36px; color: #697772; font-size: 12px; }

@media (max-width: 600px) {
  .site-header, main, footer { width: min(100% - 20px, 920px); }
  article { padding: 24px 18px; border-radius: 12px; }
}