:root{
  --ink:#1c1c1e; --paper:#fdfdfb; --navy:#20355e; --navy-soft:#e9edf5;
  --accent:#8a1f2d; --line:#c9c9c4; --code-bg:#f4f4ef;
}
*{box-sizing:border-box}
body{font-family:"Hiragino Mincho ProN","Yu Mincho","Noto Serif JP",serif;
  background:var(--paper);color:var(--ink);margin:0;line-height:1.95;font-size:16px}
main{max-width:880px;margin:0 auto;padding:28px 20px 80px}
nav.top{position:sticky;top:0;z-index:10;background:var(--navy);color:#fff;
  font-family:"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;font-size:.9em}
nav.top .in{max-width:880px;margin:0 auto;padding:0 12px;display:flex;flex-wrap:wrap;align-items:center;gap:2px}
nav.top a{color:#e8ecf5;text-decoration:none;padding:10px 12px;display:block;border-bottom:3px solid transparent}
nav.top a:hover{background:#2c4576}
nav.top a.cur{border-bottom-color:#f0c04a;color:#fff;font-weight:600}
nav.top .brand{font-weight:700;padding:10px 14px 10px 4px;letter-spacing:.06em}
h1{font-size:1.45em;border-bottom:3px double var(--navy);padding-bottom:8px;letter-spacing:.04em}
h2{font-size:1.22em;background:var(--navy);color:#fff;padding:8px 16px;margin-top:52px;
   font-family:"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;letter-spacing:.05em}
h3{font-size:1.08em;background:var(--navy-soft);border-left:6px solid var(--navy);padding:7px 14px;margin-top:40px}
h4{font-size:1em;border-bottom:1px dashed #999;padding-bottom:3px}
table{border-collapse:collapse;margin:14px 0;font-size:.9em;
  font-family:"Hiragino Sans","Yu Gothic",Meiryo,sans-serif}
th,td{border:1px solid var(--line);padding:5px 10px}
th{background:#efefe9}
pre{background:var(--code-bg);border:1px solid #ddd;padding:12px 16px;font-size:.86em;line-height:1.55;
  overflow-x:auto;font-family:"SF Mono",Consolas,Menlo,monospace}
code{font-family:"SF Mono",Consolas,Menlo,monospace;font-size:.92em;background:var(--code-bg);padding:0 3px}
pre code{background:none;padding:0}
.haiten{color:#555;font-size:.88em;margin:4px 0 16px;font-family:"Hiragino Sans",Meiryo,sans-serif}
.scenario{background:#faf5e6;border:1px solid #d9c98e;padding:10px 16px;font-size:.92em;border-radius:3px;
  margin:14px 0 24px;font-family:"Hiragino Sans",Meiryo,sans-serif}
.note{background:#fffbe8;border:1px solid #e0d090;padding:10px 16px;font-size:.9em;border-radius:3px;
  font-family:"Hiragino Sans",Meiryo,sans-serif}
.fig{margin:16px 0;text-align:center}
.fig svg{max-width:100%;height:auto}
.cyk td{width:78px;height:34px;text-align:center}
.cover{border:3px double var(--navy);padding:44px 36px;margin:36px 0;text-align:center;background:#fff}
.cover .era{letter-spacing:.25em;color:var(--accent);font-size:.95em}
.cover h1{border:none;font-size:1.7em;margin:14px 0 6px;letter-spacing:.1em}
.cover .sub{color:#444;letter-spacing:.12em}
.cover .rule{width:120px;border-top:1px solid var(--navy);margin:22px auto}
.cover .meta{font-size:.9em;color:#555;font-family:"Hiragino Sans",Meiryo,sans-serif}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:22px 0;
  font-family:"Hiragino Sans",Meiryo,sans-serif}
a.card{border:1px solid var(--line);border-top:4px solid var(--navy);background:#fff;padding:16px 18px;
  text-decoration:none;color:var(--ink);display:block;transition:box-shadow .15s}
a.card:hover{box-shadow:0 3px 12px rgba(32,53,94,.18)}
a.card .no{color:var(--accent);font-weight:700;font-size:.82em;letter-spacing:.1em}
a.card .t{font-weight:700;margin:4px 0 6px;font-size:1.02em}
a.card .d{font-size:.85em;color:#555;line-height:1.6}
.attention{border:1px solid var(--line);padding:16px 22px;font-size:.92em;background:#fff}
.attention ol{margin:6px 0;padding-left:1.4em}
footer{max-width:880px;margin:0 auto;padding:20px;color:#888;font-size:.8em;
  font-family:"Hiragino Sans",Meiryo,sans-serif;border-top:1px solid var(--line)}
@media print{nav.top{display:none} main{max-width:100%} h2{margin-top:30px}}
@media (max-width:640px){body{font-size:15px} nav.top a{padding:10px 8px}}

.ref{background:#f2f6f2;border-left:4px solid #4a7a55;padding:7px 12px;font-size:.85em;
  color:#333;font-family:"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;margin:0 0 18px}
.credit{color:#666;font-size:.86em;font-family:"Hiragino Sans",Meiryo,sans-serif}