:root {
  color-scheme: light;
  --green: #22db5b;
  --ink: #111111;
  --muted: #5f6368;
  --line: #dfe3e1;
  --soft: #f4f7f5;
  --white: #ffffff;
}

* { box-sizing: border-box; letter-spacing: 0; }
html, body { margin: 0; background: var(--white); }
body { color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif; font-size: 16px; line-height: 1.75; }
.brand-bar { height: 8px; background: var(--green); }
header, main, footer { width: min(880px, calc(100% - 40px)); margin-inline: auto; }
header { padding: 42px 0 30px; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 12px; width: fit-content; color: inherit; font-size: 18px; font-weight: 750; text-decoration: none; }
.mark { display: grid; width: 34px; height: 34px; place-items: center; border: 2px solid var(--ink); border-radius: 7px; background: var(--green); font-size: 28px; font-weight: 900; line-height: 1; }
nav { display: flex; flex-wrap: wrap; gap: 18px; margin: 24px 0 34px; }
nav a { color: var(--muted); font-weight: 700; text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; text-decoration-color: var(--green); text-decoration-thickness: 3px; text-underline-offset: 5px; }
h1, h2 { margin: 0; line-height: 1.35; }
h1 { font-size: clamp(30px, 5vw, 48px); }
h2 { margin-top: 38px; font-size: 21px; }
p, ul { margin: 12px 0 0; }
ul { padding-left: 1.4em; }
a { color: #086b2b; }
.updated { margin-top: 12px; color: var(--muted); font-size: 14px; }
.summary, .contact { margin-top: 30px; padding: 18px 20px; border-left: 5px solid var(--green); background: var(--soft); }
.summary { font-weight: 650; }
main { padding: 8px 0 64px; }
.language { padding-top: 16px; }
.language + .language { margin-top: 54px; padding-top: 48px; border-top: 1px solid var(--line); }
footer { padding: 24px 0 36px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
code { padding: 2px 5px; border-radius: 4px; background: var(--soft); font-family: ui-monospace, "Cascadia Code", monospace; font-size: .92em; }
@media (max-width: 560px) {
  header, main, footer { width: min(100% - 28px, 880px); }
  header { padding-top: 30px; }
  nav { gap: 14px; }
}