:root {
  color-scheme: light dark;
  --bg: #fffdf6;
  --fg: #3d3a33;
  --muted: #7a7568;
  --line: #e8e2d4;
  --accent: #d9a521;
  --card: #fffefb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1b18;
    --fg: #e9e5da;
    --muted: #a8a294;
    --line: #35332c;
    --accent: #e8bf5a;
    --card: #232219;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.95;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 5rem;
}

header.site {
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.25rem;
  margin-bottom: 2.5rem;
}
header.site a.brand {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: .02em;
}
header.site .tag {
  display: block;
  font-size: .8rem;
  color: var(--muted);
  margin-top: .2rem;
}

h1 {
  font-size: 1.5rem;
  line-height: 1.6;
  margin: 0 0 .3em;
}
h2 {
  font-size: 1.1rem;
  margin: 2.6em 0 .6em;
  padding-top: .9em;
  border-top: 1px solid var(--line);
}
h2:first-of-type { border-top: none; padding-top: 0; }
h3 { font-size: 1rem; margin: 1.8em 0 .4em; }

p, li { margin: .5em 0; }
ul { padding-left: 1.3em; }

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

.lead {
  font-size: 1.02rem;
  color: var(--muted);
  margin-bottom: 2.5rem;
}

.note {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  padding: 1rem 1.2rem;
  margin: 1.6em 0;
}
.note p:first-child { margin-top: 0; }
.note p:last-child { margin-bottom: 0; }

.big {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.8;
}

.mail {
  display: inline-block;
  font-size: 1.05rem;
  font-weight: 700;
  padding: .6em 1.1em;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  text-decoration: none;
  margin: .6em 0;
}

dl.qa dt {
  font-weight: 700;
  margin-top: 1.6em;
}
dl.qa dd {
  margin: .3em 0 0;
}

footer.site {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: .85rem;
  color: var(--muted);
}
footer.site a { color: var(--muted); }
footer.site nav { margin-bottom: .8rem; }
footer.site nav a { margin-right: 1.2em; }

.updated {
  font-size: .85rem;
  color: var(--muted);
  margin-top: 3rem;
}