:root {
  --bg: #fafaf7;
  --fg: #1e1e1e;
  --muted: #666;
  --accent: #0d5c43;
  --accent-soft: #e6f2ec;
  --line: #e2e2dc;
  --card: #ffffff;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #ececec;
    --muted: #a0a0a0;
    --accent: #5fbf9a;
    --accent-soft: #1b2a24;
    --line: #2c2f35;
    --card: #1c1f24;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  line-height: 1.8;
  font-size: 16px;
}
header.site {
  border-bottom: 1px solid var(--line);
  background: var(--card);
}
header.site .inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
header.site a.brand {
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: 0.02em;
}
header.site nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 16px;
  font-size: 14px;
}
header.site nav a:hover { color: var(--accent); }
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}
h1 { font-size: 1.7rem; line-height: 1.4; margin: 0 0 8px; }
h2 {
  font-size: 1.2rem;
  margin: 40px 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}
h3 { font-size: 1.02rem; margin: 24px 0 8px; }
p { margin: 0 0 14px; }
ul, ol { padding-left: 1.4em; margin: 0 0 14px; }
li { margin: 4px 0; }
a { color: var(--accent); }
.lead { color: var(--muted); margin-bottom: 24px; }
.meta { color: var(--muted); font-size: 14px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
  margin: 16px 0;
}
.note {
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 12px 16px;
  margin: 16px 0;
  font-size: 15px;
}
table { border-collapse: collapse; width: 100%; margin: 0 0 16px; font-size: 15px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--accent-soft); font-weight: 600; white-space: nowrap; }
.table-wrap { overflow-x: auto; }
footer.site {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  padding: 24px 20px 40px;
}
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 10px 18px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  margin: 6px 8px 6px 0;
}
.btn.secondary {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}