:root{
  --accent:#F09000;
  --accent-deep:#9c5600;
  --ink:#1f232b;
  --line:#d8dee8;
  --bg:#f4f7fb;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:"Yu Mincho","Hiragino Mincho ProN","Noto Serif JP",serif;color:var(--ink);background:var(--bg)}
.layout{display:grid;grid-template-columns:300px 1fr;min-height:100vh}
.sidebar{background:#fff;border-right:1px solid var(--line);padding:14px;position:sticky;top:0;height:100vh;overflow:auto;z-index:30}
.sidebar-header{display:flex;align-items:center;justify-content:space-between;gap:8px}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand img{width:52px;height:52px;object-fit:contain}
.brand h1{margin:0;font-size:1rem;line-height:1.3}
.brand small{display:block;font-size:.82rem;color:#5f6b78}
.btn{border:1px solid #c9d2df;background:#fff;padding:6px 8px;border-radius:8px;cursor:pointer;font-family:inherit}
.nav{margin-top:12px}
.nav a{display:block;text-decoration:none;color:#20384f;border:1px solid var(--line);background:#fff;padding:10px;border-radius:10px;margin-bottom:8px}
.nav a.active{background:#fff4e2;border-color:#ffcb89;font-weight:700}
.util{margin-top:12px;padding-top:10px;border-top:1px dashed #ccd6e3}
.util a{display:block;text-decoration:none;color:#1f4e66;margin:8px 0}
.main{position:relative}
.main::before{content:"";position:fixed;right:3vw;top:18vh;width:min(34vw,420px);aspect-ratio:1/1;background:url('../その他/国章.png') center/contain no-repeat;opacity:.06;pointer-events:none}
.header-visual{min-height:210px;background:linear-gradient(120deg,rgba(240,144,0,.84),rgba(28,61,95,.58)),url('./image/アーケイ.jpg') center/cover no-repeat;color:#fff;display:flex;align-items:flex-end;padding:18px clamp(16px,3vw,36px)}
.header-visual h2{margin:0;line-height:1.4;font-size:clamp(1.2rem,2.7vw,1.9rem);text-shadow:0 2px 10px rgba(0,0,0,.34)}
.header-sub{background:#fff6ea;border-top:1px solid #ffd8a8;color:#7a4500;padding:10px clamp(16px,3vw,36px);font-weight:700}
.content{padding:18px clamp(16px,3vw,36px) 28px}
.section{border:1px solid var(--line);background:#fff;border-radius:14px;padding:16px;line-height:1.95;box-shadow:0 8px 20px rgba(0,30,70,.05)}
.section h2,.section h3{margin:.2em 0 .45em;color:var(--accent-deep)}
.section p{margin:.45em 0}
.discover-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:10px 0}
.discover-btn{display:block;text-decoration:none;color:#2b2f35;border:1px solid #ffc988;background:#fff8ee;padding:12px;border-radius:12px}
.discover-btn:hover{background:#fff1d9}
.manuscript{white-space:pre-wrap;line-height:1.95;margin:0;font-family:inherit}
.side-open{display:none;position:fixed;left:12px;top:12px;z-index:40}
body.sidebar-hidden .layout{grid-template-columns:1fr}
body.sidebar-hidden .sidebar{position:fixed;left:0;top:0;transform:translateX(-110%);transition:transform .18s ease}
body.sidebar-hidden .side-open{display:inline-block}
@media (max-width:960px){
  .layout{grid-template-columns:1fr}
  .sidebar{position:fixed;left:0;top:0;transform:translateX(-110%);transition:transform .18s ease;width:min(88vw,320px)}
  body.sidebar-open .sidebar{transform:translateX(0)}
  .side-open{display:inline-block}
}

.indent-block{margin:.4em 0 .8em 1.2em;padding:.3em .8em;border-left:3px solid #ffd19a;background:#fffaf1;border-radius:0 8px 8px 0}
.indent-line{margin:.25em 0}
.bullet-line{padding-left:.6em;border-left:2px solid #ffd19a}