:root { --ink: #37474F; --sub: #6b7a82; --line: #dfe4e7; --bg: #ffffff; --soft: #f5f7f8; --link: #0F83DE; }
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  line-height: 1.8; -webkit-text-size-adjust: 100%;
}
a { color: var(--link); overflow-wrap: anywhere; }
header.site, footer.site, main.doc { max-width: 760px; margin: 0 auto; padding-left: 16px; padding-right: 16px; }
header.site { display: flex; align-items: center; justify-content: space-between; padding-top: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
header.site img { width: 140px; height: auto; display: block; }
main.doc { padding-top: 8px; padding-bottom: 40px; }
h1 { font-size: 1.5rem; line-height: 1.4; margin: 24px 0 4px; }
.date { color: var(--sub); font-size: 0.9rem; margin: 0 0 24px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; padding-top: 8px; border-top: 1px solid var(--line); }
h3 { font-size: 1rem; margin: 24px 0 4px; }
p, li { font-size: 1rem; }
ul, ol { padding-left: 1.5em; }
li { margin: 4px 0; }
table { width: 100%; border-collapse: collapse; margin: 8px 0 24px; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border: 1px solid var(--line); }
th { background: var(--soft); width: 30%; font-weight: normal; }
@media (max-width: 560px) {
  th, td { display: block; width: 100%; border-top: none; }
  tr:first-child th { border-top: 1px solid var(--line); }
}
footer.site { border-top: 1px solid var(--line); padding-top: 16px; padding-bottom: 32px; color: var(--sub); font-size: 0.9rem; }
footer.site nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
footer.site p { margin: 12px 0 0; }