:root {
  --ink: #16303a;
  --ink-soft: #4a6873;
  --line: #dde5e8;
  --bg: #ffffff;
  --bg-alt: #f4f8f9;
  --accent: #0d7d8c;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.9;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }
header {
  border-bottom: 1px solid var(--line);
}
header .wrap { display: flex; align-items: center; height: 64px; }
.logo { font-weight: 700; font-size: 17px; text-decoration: none; color: var(--ink); }
.logo span { color: var(--accent); }
main { padding: 56px 0 80px; }
h1 { font-size: 28px; margin: 0 0 10px; line-height: 1.45; }
.updated { color: var(--ink-soft); font-size: 14px; margin-bottom: 44px; }
h2 {
  font-size: 19px; margin: 44px 0 14px; padding-top: 24px;
  border-top: 1px solid var(--line); line-height: 1.5;
}
h2:first-of-type { border-top: none; padding-top: 0; margin-top: 0; }
h3 { font-size: 16px; margin: 26px 0 8px; }
p { margin: 0 0 1.1em; }
ul, ol { margin: 0 0 1.1em; padding-left: 22px; }
li { margin-bottom: 7px; }
a { color: var(--accent); }
table {
  width: 100%; border-collapse: collapse; margin: 0 0 1.4em; font-size: 15px;
}
th, td {
  border: 1px solid var(--line); padding: 13px 16px; text-align: left;
  vertical-align: top;
}
th {
  background: var(--bg-alt); font-weight: 600; width: 34%; white-space: nowrap;
}
.todo {
  background: #fff3cd; padding: 1px 7px; border-radius: 3px;
  font-weight: 600; color: #7a5b00;
}
footer {
  border-top: 1px solid var(--line); padding: 32px 0;
  font-size: 14px; color: var(--ink-soft);
}
footer a { color: var(--ink-soft); text-decoration: none; margin-right: 18px; }
footer a:hover { text-decoration: underline; }
@media (max-width: 640px) {
  main { padding: 40px 0 60px; }
  h1 { font-size: 23px; }
  th, td { display: block; width: 100%; border-bottom: none; }
  td { border-top: none; }
  table { border-bottom: 1px solid var(--line); }
}