:root {
  --ink: #1a1a1a;
  --muted: #6b6b6b;
  --line: #e4e4e4;
  --bg: #ffffff;
  --accent: #1f6f5c;
  --soft: #f4f7f5;
  --max: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #ececec;
    --muted: #9a9a9a;
    --line: #2e2e2e;
    --bg: #131313;
    --accent: #62c3a8;
    --soft: #1a201e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 24px;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.85;
  font-size: 16px;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 64px 0 96px; }

header { border-bottom: 1px solid var(--line); padding-bottom: 32px; margin-bottom: 48px; }

.logo {
  font-size: 24px;
  font-weight: 700;
  text-decoration: none;
  color: var(--ink);
}

.tagline { color: var(--muted); margin-top: 8px; font-size: 15px; }

h1 { font-size: 27px; line-height: 1.55; margin: 0 0 24px; font-weight: 700; }
h2 { font-size: 19px; margin: 44px 0 14px; font-weight: 700; }
h3 { font-size: 16px; margin: 26px 0 8px; font-weight: 700; }

p { margin: 0 0 16px; }
ul { margin: 0 0 16px; padding-left: 22px; }
li { margin-bottom: 6px; }

a { color: var(--accent); }

.langbar { margin-bottom: 40px; font-size: 14px; }
.langbar a { margin-right: 16px; }

.lead {
  background: var(--soft);
  border-radius: 10px;
  padding: 20px 22px;
  margin-bottom: 32px;
  font-size: 15px;
}

.lead p:last-child { margin-bottom: 0; }

.updated { color: var(--muted); font-size: 14px; margin-bottom: 40px; }

.divider { border: 0; border-top: 1px solid var(--line); margin: 72px 0 48px; }

footer {
  border-top: 1px solid var(--line);
  margin-top: 72px;
  padding-top: 24px;
  color: var(--muted);
  font-size: 14px;
}

footer a { margin-right: 18px; }