@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+TC:wght@400;600;700&display=swap');

:root{
  --primary:#4a1607;
  --primary2:#75250b;
  --accent:#c47a32;
  --accent2:#a84a18;
  --paper:#fff;
  --bg:#f7f2e9;
  --soft:#f2e5d4;
  --line:#ded2c1;
  --ink:#20150e;
  --muted:#6b5648;
  --shadow:0 12px 35px rgba(74,22,7,.12);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  padding:30px 14px;
  color:var(--ink);
  background:var(--bg);
  font-family:"Microsoft JhengHei","Noto Serif TC",Georgia,serif;
  line-height:1.9;
}
a{color:#7d2b0e}
.container{width:min(1060px,100%);margin:0 auto}

.book-header{
  position:relative;
  padding:31px 34px 27px;
  color:#f6ead6;
  background:linear-gradient(135deg,var(--primary),var(--primary2));
  border-bottom:5px solid var(--accent);
  border-radius:10px 10px 0 0;
  box-shadow:var(--shadow);
}
.zh-toggle{
  position:absolute;bottom:14px;right:16px;
  padding:6px 14px;color:#4a1607;background:var(--accent);
  border:1px solid #f6ead6;border-radius:20px;font-weight:700;
  font-size:.85rem;cursor:pointer;
}
.zh-toggle:hover{background:#e0954a}
.book-header h1{margin:0 0 4px;font-size:clamp(1.3rem,4vw,1.9rem)}
.book-header .subtitle{opacity:.9;font-size:1rem;font-style:italic}

.page-nav,.top-nav{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:9px;
  padding:14px 18px;background:#fff;border:1px solid var(--line);border-top:0;
}
.page-nav a,.page-nav .disabled,.top-nav a{
  display:inline-flex;align-items:center;justify-content:center;min-height:39px;
  padding:7px 15px;border:1px solid #9e4a1c;border-radius:5px;
  color:#57200d;background:#fff;text-decoration:none;font-weight:700;
}
.page-nav a:hover,.top-nav a:hover{color:#fff;background:#9e4a1c}
.page-nav .disabled{color:#aaa;border-color:#d5d5d5;background:#fafafa}
.page-nav .home-btn,.top-nav .home-btn{color:#fff;background:#6d28d9;border-color:#6d28d9}
.page-nav .qa-btn,.top-nav .qa-btn{color:#fff;background:#0f766e;border-color:#0f766e}
.page-nav .qa-btn:hover,.top-nav .qa-btn:hover{background:#0b5f59}

.index-panel,.article{
  margin-top:18px;
  padding:28px 32px;background:#fff;border:1px solid #e2d8cb;
  border-radius:8px;box-shadow:var(--shadow);
}

.jump-bar{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) minmax(0,2fr);
  gap:12px;margin:4px 0 8px;
}
.jump-group label{
  display:block;margin:0 0 4px;color:#57200d;font-size:.87rem;font-weight:700;
}
.jump-group select{
  width:100%;min-height:43px;padding:8px 11px;color:var(--ink);background:#fff;
  border:1px solid var(--accent);border-radius:5px;font:inherit;
}

.chapter-title{
  margin:-28px -32px 12px;padding:15px 24px;color:var(--primary);background:var(--soft);
  border-bottom:1px solid var(--line);border-left:8px solid var(--accent2);
  font-size:clamp(1.2rem,3vw,1.55rem);font-weight:700;
}
.article p{margin:0 0 1.2em;text-align:justify}
.index-panel p{margin:0 0 1.1em;text-align:justify}

.denom-heading{
  margin:30px 0 10px;padding:9px 14px;color:#fff;background:#6d4a1f;
  border-radius:5px;font-size:1.05rem;
}
.article p.denom-note{
  margin:0 0 1em;padding:10px 14px;color:#4a3a20;background:#faf3e6;
  border-left:4px solid var(--accent);border-radius:0 5px 5px 0;
  font-style:italic;text-align:left;
}

.toc-lang{
  margin:24px 0 11px;padding:10px 14px;color:#fff;background:var(--primary);
  border-left:6px solid var(--accent);border-radius:5px;
}
.toc-list{columns:2;column-gap:30px;margin:0;padding-left:24px}
.toc-list.toc-flat{columns:3}
.toc-list li{break-inside:avoid;margin:.34em 0}
.toc-list a{text-decoration:none}
.toc-list a:hover{text-decoration:underline}

.copyright{
  margin-top:28px;padding:17px 21px;color:#4f3524;background:#efe2d1;
  border-top:3px solid var(--accent2);border-radius:6px;font-size:.88rem;
}
.copyright h3{margin:0 0 6px;color:var(--primary)}

.status-box{
  padding:12px 15px;color:#596273;background:#f7f8fa;
  border:1px dashed #b5becb;border-radius:5px;
}

.collapse-toggle summary{
  cursor:pointer;list-style:none;padding:10px 14px;color:#fff;
  background:var(--primary);border-radius:5px;font-weight:700;
  font-size:1.05rem;
}
.collapse-toggle summary::-webkit-details-marker{display:none}
.collapse-toggle summary::before{content:"▸ ";display:inline-block;transition:transform .15s}
.collapse-toggle[open] summary::before{transform:rotate(90deg)}
.collapse-toggle .collapse-body{margin-top:14px}
.collapse-toggle + .collapse-toggle{margin-top:14px}

@media(max-width:800px){
  body{padding:14px 7px}
  .book-header{padding:24px 18px}
  .zh-toggle{position:static;display:inline-block;margin-bottom:10px}
  .jump-bar{grid-template-columns:1fr}
  .article,.index-panel{padding:21px 15px}
  .chapter-title{margin:-21px -15px 12px;padding:13px 14px}
  .toc-list,.toc-list.toc-flat{columns:1}
}