*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
@media (prefers-reduced-motion: reduce){*{transition:none!important;scroll-behavior:auto!important}}

:root{
  --wine:#6b2737;--wine-dk:#521c29;--wine-lt:#f4e9eb;
  --gray:#4a4744;--gray-lt:#8a8580;--line:#d9d6d2;--bg2:#f2f2f1;--white:#ffffff;
  --ink:#2b2927;
  --ff:'IBM Plex Sans JP',sans-serif;--ff-num:'Jost','IBM Plex Sans JP',sans-serif;
  --maxw:1080px;
}
body{font-family:var(--ff);color:var(--ink);background:var(--white);font-size:16px;line-height:1.95;-webkit-font-smoothing:antialiased}
:focus-visible{outline:2px solid var(--wine);outline-offset:3px}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}

/* ===== header：2段構成 ===== */
.hd-top{border-bottom:1px solid var(--line)}
.hd-top .wrap{display:flex;align-items:center;justify-content:space-between;min-height:68px}
.logo{font-weight:700;font-size:19px;letter-spacing:.04em;color:var(--wine)}
.hd-nav{background:var(--bg2);border-bottom:1px solid var(--line)}
.hd-nav ul{display:flex;max-width:var(--maxw);margin:0 auto;padding:0 28px}
.hd-nav li{flex:1;border-left:1px solid var(--line)}
.hd-nav li:last-child{border-right:1px solid var(--line)}
.hd-nav a{display:block;text-align:center;padding:12px 6px;font-size:14px;font-weight:500;color:var(--gray);border-top:3px solid transparent;transition:color .2s,background .2s}
.hd-nav a:hover{color:var(--wine);background:var(--white)}
.hd-nav a.is-active{color:var(--wine);background:var(--white);border-top-color:var(--wine);font-weight:700}
.burger{display:none;width:42px;height:42px;background:none;border:1px solid var(--line);cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:5px}
.burger span{display:block;width:18px;height:2px;background:var(--gray);transition:.3s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.drawer{display:none}

/* ===== top page ===== */
.top-hero{border-bottom:1px solid var(--line)}
.top-hero .wrap{display:grid;grid-template-columns:1fr 1.05fr;gap:64px;padding-top:72px;padding-bottom:80px;align-items:start}
.top-hero h1{font-size:clamp(28px,3.6vw,40px);line-height:1.5;font-weight:700;letter-spacing:.02em;color:var(--ink)}
.top-hero h1 .sub{display:block;font-size:.62em;font-weight:500;color:var(--gray);letter-spacing:.06em;margin-bottom:6px}
.top-lead{margin-top:28px;padding-left:18px;border-left:3px solid var(--wine);color:var(--gray);max-width:30em}
.toc{border-top:2px solid var(--gray)}
.toc li{border-bottom:1px solid var(--line)}
.toc a{display:grid;grid-template-columns:52px 1fr;gap:4px 16px;padding:20px 4px;transition:background .2s}
.toc a:hover{background:var(--bg2)}
.toc .no{grid-row:1/3;font-family:var(--ff-num);font-weight:500;font-size:30px;line-height:1.1;color:var(--wine)}
.toc .tt{font-weight:700;font-size:18px;line-height:1.5}
.toc .ds{font-size:14px;color:var(--gray);line-height:1.8}
.toc-cap{font-size:13px;color:var(--gray-lt);margin-bottom:10px}

/* ===== lower page：左に位置表示＋目次、右に本文 ===== */
.lower .wrap{display:grid;grid-template-columns:230px 1fr;gap:64px;padding-top:60px;padding-bottom:80px}
.side{position:sticky;top:24px;align-self:start}
.cell{display:flex;align-items:center;gap:0;margin-bottom:10px}
.cell-body{display:grid;grid-template-columns:repeat(5,1fr);gap:3px;width:150px;height:34px;padding:3px;border:2px solid var(--gray);border-radius:4px}
.cell-body i{background:var(--bg2);border-radius:1px}
.cell-body i.on{background:var(--wine)}
.cell-cap{width:5px;height:14px;background:var(--gray);border-radius:0 2px 2px 0}
.pos{font-size:13px;color:var(--gray);margin-bottom:22px}
.pos b{font-family:var(--ff-num);font-weight:600;font-size:16px;color:var(--wine)}
.side-list{border-top:1px solid var(--line)}
.side-list li{border-bottom:1px solid var(--line)}
.side-list a{display:flex;gap:10px;padding:10px 2px;font-size:14px;color:var(--gray)}
.side-list a span{font-family:var(--ff-num);color:var(--gray-lt);width:18px}
.side-list a:hover{color:var(--wine)}
.side-list a[aria-current="page"]{color:var(--wine);font-weight:700}
.side-list a[aria-current="page"] span{color:var(--wine)}
.article{max-width:40em}
.article h1{font-size:clamp(26px,3.4vw,36px);font-weight:700;line-height:1.45;letter-spacing:.03em;padding-bottom:18px;margin-bottom:34px;border-bottom:1px solid var(--line)}
.article p{margin-bottom:1.5em}
.pager{display:flex;justify-content:space-between;gap:16px;margin-top:52px;padding-top:24px;border-top:2px solid var(--gray)}
.pager a{display:block;padding:12px 18px;border:1px solid var(--line);min-width:40%;transition:border-color .2s,background .2s}
.pager a:hover{border-color:var(--wine);background:var(--wine-lt)}
.pager small{display:block;font-size:12px;color:var(--gray-lt)}
.pager strong{font-size:15px;color:var(--wine)}
.pager .next{margin-left:auto;text-align:right}

/* ===== sitemap／links：1カラムのリスト ===== */
.single .wrap{max-width:820px;padding-top:60px;padding-bottom:80px}
.single h1{font-size:clamp(26px,3.4vw,36px);font-weight:700;letter-spacing:.03em;padding-bottom:18px;margin-bottom:20px;border-bottom:1px solid var(--line)}
.single .intro{color:var(--gray);margin-bottom:34px}
.map-list{border-top:2px solid var(--gray)}
.map-list li{border-bottom:1px solid var(--line)}
.map-list a{display:block;padding:18px 4px;transition:background .2s}
.map-list a:hover{background:var(--bg2)}
.map-list .tt{display:block;font-weight:700;color:var(--wine);font-size:17px}
.map-list .ds{display:block;font-size:14.5px;color:var(--gray);line-height:1.8;margin-top:2px}
.map-list .child a{padding-left:28px}
.pending{padding:26px 24px;background:var(--bg2);border:1px solid var(--line);color:var(--gray)}

/* ===== footer ===== */
.ft{background:var(--gray);color:#fff;margin-top:0}
.ft .wrap{display:flex;justify-content:space-between;align-items:center;gap:20px 40px;flex-wrap:wrap;padding-top:30px;padding-bottom:30px}
.ft-name{font-weight:700;font-size:15px}
.ft-nav ul{display:flex;flex-wrap:wrap;gap:6px 22px;font-size:13.5px}
.ft-nav a{opacity:.85}
.ft-nav a:hover{opacity:1;text-decoration:underline;text-underline-offset:4px}
.ft-copy{background:#3b3936;color:rgba(255,255,255,.7);font-size:12px;text-align:center;padding:12px}

.to-top{position:fixed;right:18px;bottom:18px;width:44px;height:44px;background:var(--wine);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;border-radius:3px;opacity:0;pointer-events:none;transition:opacity .3s;z-index:50}
.to-top.show{opacity:1;pointer-events:auto}

/* ===== responsive ===== */
@media(max-width:900px){
  .top-hero .wrap{grid-template-columns:1fr;gap:40px;padding-top:48px;padding-bottom:56px}
  .lower .wrap{grid-template-columns:1fr;gap:28px;padding-top:36px}
  .side{position:static}
  .side-list{display:none}
  .pos{margin-bottom:0}
}
@media(max-width:820px){
  .hd-nav{display:none}
  .burger{display:flex}
  .hd-top{position:relative}
  .drawer.open{display:block;position:absolute;top:100%;left:0;right:0;background:var(--white);border-bottom:2px solid var(--wine);z-index:40}
  .drawer ul{padding:4px 28px 12px}
  .drawer li{border-bottom:1px solid var(--line)}
  .drawer a{display:block;padding:12px 0;font-size:15px;color:var(--gray)}
  .drawer a.is-active{color:var(--wine);font-weight:700}
  .ft .wrap{flex-direction:column;align-items:flex-start}
}
@media(max-width:480px){
  .wrap{padding:0 20px}
  .logo{font-size:15.5px;line-height:1.4}
  .drawer ul{padding:4px 20px 12px}
  .pager{flex-direction:column}
  .pager a{min-width:0}
  .pager .next{margin-left:0}
}