:root{
  --paper:#F4F5F2;
  --card:#FFFFFF;
  --ink:#262A2E;
  --sub:#5E6870;
  --line:#D9DDD8;
  --primary:#3E5266;
  --primary-ink:#FFFFFF;
  --primary-soft:#E4EAEF;
  --accent:#6E7F4C;
  --accent-soft:#ECEFDD;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#14171A;
    --card:#1D2226;
    --ink:#E6E9EA;
    --sub:#9AA5AC;
    --line:#333B41;
    --primary:#8FA9C4;
    --primary-ink:#0E1418;
    --primary-soft:#24303B;
    --accent:#A5B573;
    --accent-soft:#2A2F1C;
  }
}
:root[data-theme="dark"]{
  --paper:#14171A;
  --card:#1D2226;
  --ink:#E6E9EA;
  --sub:#9AA5AC;
  --line:#333B41;
  --primary:#8FA9C4;
  --primary-ink:#0E1418;
  --primary-soft:#24303B;
  --accent:#A5B573;
  --accent-soft:#2A2F1C;
}
*{box-sizing:border-box;margin:0;padding:0}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic",Meiryo,sans-serif;
  font-size:17px;
  line-height:2.0;
}
.serif{font-family:"Hiragino Mincho ProN","Yu Mincho","BIZ UDMincho",serif}
header.site{
  max-width:680px;margin:0 auto;padding:22px 20px 0;
  display:flex;justify-content:space-between;align-items:baseline
}
header.site a.brand{
  font-family:"Hiragino Mincho ProN","Yu Mincho",serif;
  font-size:19px;font-weight:600;color:var(--ink);text-decoration:none
}
header.site a.to-shindan{font-size:14px;color:var(--primary)}
main{max-width:680px;margin:0 auto;padding:30px 20px 80px}
article .date{font-size:13px;color:var(--sub);letter-spacing:.06em}
article h1{
  font-family:"Hiragino Mincho ProN","Yu Mincho",serif;
  font-size:clamp(26px,5.5vw,34px);font-weight:600;line-height:1.6;
  margin:10px 0 34px;text-wrap:balance
}
article h2{
  font-size:21px;font-weight:700;line-height:1.6;
  margin:44px 0 16px;padding-bottom:10px;border-bottom:1px solid var(--line)
}
article p{margin-bottom:22px}
article ul,article ol{margin:0 0 22px 1.4em;display:flex;flex-direction:column;gap:8px}
article b,article strong{font-weight:700}
article .num{font-variant-numeric:tabular-nums}
.tablewrap{overflow-x:auto;margin:0 0 22px}
table{border-collapse:collapse;width:100%;min-width:400px;font-size:15px;background:var(--card)}
th,td{border:1px solid var(--line);padding:10px 14px;text-align:left}
th{background:var(--primary-soft);font-weight:700;font-size:14px}
.note{
  background:var(--card);border-left:4px solid var(--accent);
  padding:16px 20px;margin:0 0 22px;font-size:15.5px;color:var(--sub)
}
.cta{
  background:var(--card);border:1.5px solid var(--primary);border-radius:14px;
  padding:28px 26px;margin:48px 0 0;text-align:center
}
.cta p.lead{font-size:16px;color:var(--sub);margin-bottom:18px;text-align:left}
.cta a.btn{
  display:block;padding:18px;border-radius:12px;
  background:var(--primary);color:var(--primary-ink);
  font-size:18px;font-weight:700;text-decoration:none;letter-spacing:.04em
}
.cta .quiet{font-size:13px;color:var(--sub);margin-top:12px}
nav.related{max-width:680px;margin:0 auto;padding:0 20px 40px}
nav.related h2{font-size:16px;font-weight:700;margin-bottom:14px;color:var(--sub)}
nav.related ul{list-style:none;display:flex;flex-direction:column;gap:10px}
nav.related a{color:var(--primary);font-size:15.5px;text-decoration:underline;text-underline-offset:3px}
footer.site{
  border-top:1px solid var(--line);
  max-width:680px;margin:0 auto;padding:24px 20px 60px;
  font-size:13px;color:var(--sub);line-height:2;text-align:center
}
footer.site a{color:var(--sub)}
.index-list{list-style:none;display:flex;flex-direction:column;gap:18px}
.index-list li{background:var(--card);border:1.5px solid var(--line);border-radius:12px;padding:20px 22px}
.index-list a{font-size:18px;font-weight:700;color:var(--ink);text-decoration:none;line-height:1.6}
.index-list a:hover{color:var(--primary)}
.index-list p{font-size:14.5px;color:var(--sub);margin:8px 0 0}