:root {
  --ink:#0d1117;
  --ink-2:#1f2937;
  --muted:#6b7280;
  --line:#e5e7eb;
  --bg:#fbfbfa;
  --bg-2:#ffffff;
  --accent:#0a5d3a;
  --accent-2:#067a4b;
  --max:780px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic UI","Meiryo",sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.85;
  font-size:15px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-underline-offset:3px}
a:hover{color:var(--accent-2)}
header.site{
  border-bottom:1px solid var(--line);
  background:#fff;
  padding:14px 0;
}
header.site .wrap{
  max-width:var(--max);margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;
}
header.site .brand{
  display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.02em;
  text-decoration:none;color:var(--ink);
}
header.site .brand .mark{
  width:24px;height:24px;border-radius:6px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
}
header.site nav a{font-size:13px;color:var(--ink-2);text-decoration:none;margin-left:18px}

main{
  max-width:var(--max);margin:0 auto;padding:48px 24px 96px;background:#fff;
}
h1{font-size:28px;letter-spacing:.01em;margin:0 0 8px;line-height:1.4}
h2{font-size:20px;margin:40px 0 12px;padding-top:8px;border-top:1px solid var(--line);padding-top:32px}
h2:first-of-type{border-top:0;padding-top:0}
h3{font-size:16px;margin:24px 0 8px}
p{margin:8px 0}
blockquote{
  border-left:3px solid var(--accent);
  background:#f0fdf4;
  margin:16px 0;padding:14px 18px;
  border-radius:0 8px 8px 0;
  color:var(--ink-2);
  font-size:14px;
}
ul,ol{padding-left:22px;margin:8px 0}
li{margin:4px 0}
table{
  border-collapse:collapse;width:100%;margin:12px 0;font-size:14px;
}
th,td{
  border:1px solid var(--line);padding:8px 12px;text-align:left;vertical-align:top;
}
th{background:#f9fafb;font-weight:600}
code{
  background:#f3f4f6;padding:2px 6px;border-radius:4px;font-size:13px;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
hr{border:0;border-top:1px solid var(--line);margin:32px 0}
strong{font-weight:700}
em{font-style:normal;color:var(--accent);font-weight:600}

footer{
  border-top:1px solid var(--line);background:#fff;
  padding:24px 0 48px;color:var(--muted);font-size:12px;
}
footer .wrap{max-width:var(--max);margin:0 auto;padding:0 24px}