:root {
  --bg: #fbfaf9;
  --surface: #ffffff;
  --text: #1c1a17;
  --muted: #6b6560;
  --border: #e5e1dc;
  --accent: #863bff;
  --accent-soft: #f3ecff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17151a;
    --surface: #201d26;
    --text: #ece9f0;
    --muted: #a49eae;
    --border: #322d3b;
    --accent: #b38cff;
    --accent-soft: #2a2235;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.75;
  font-size: 16px;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 3rem 1.5rem 5rem; }
header { border-bottom: 1px solid var(--border); margin-bottom: 2.5rem; padding-bottom: 1.5rem; }
.brand { font-size: 1.05rem; font-weight: 700; letter-spacing: -0.01em; text-decoration: none; color: var(--text); }
.brand span { color: var(--accent); }
.tag { display: inline-block; margin-left: .6rem; padding: .1rem .5rem; border-radius: 99px;
       background: var(--accent-soft); color: var(--accent); font-size: .72rem; font-weight: 600; vertical-align: middle; }
h1 { font-size: 1.9rem; line-height: 1.35; letter-spacing: -0.02em; margin: 0 0 1rem; }
h2 { font-size: 1.15rem; margin: 2.5rem 0 .75rem; letter-spacing: -0.01em; }
h3 { font-size: 1rem; margin: 1.75rem 0 .5rem; }
p, li { color: var(--text); }
.lead { font-size: 1.05rem; color: var(--muted); }
.muted { color: var(--muted); font-size: .9rem; }
a { color: var(--accent); }
ul { padding-left: 1.25rem; }
li { margin: .35rem 0; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 1.25rem 1.5rem; margin: 1.5rem 0; }
.callout { border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 8px 8px 0;
           padding: 1rem 1.25rem; margin: 1.5rem 0; }
.callout p { margin: 0; }
table { width: 100%; border-collapse: collapse; margin: 1.25rem 0; font-size: .92rem; display: block; overflow-x: auto; }
th, td { text-align: left; padding: .6rem .75rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-weight: 600; color: var(--muted); font-size: .82rem; text-transform: uppercase; letter-spacing: .04em; }
code { background: var(--accent-soft); padding: .12em .4em; border-radius: 4px; font-size: .88em; }
footer { margin-top: 4rem; padding-top: 1.5rem; border-top: 1px solid var(--border); font-size: .88rem; color: var(--muted); }
footer a { margin-right: 1.25rem; }
.en { color: var(--muted); font-size: .88rem; font-style: normal; }