:root{
  --paper:#ffffff;
  --paper2:#f3f5f8;
  --card:#ffffff;
  --line:#dde3ea;
  --line-strong:#aab4c2;
  --ink:#101825;
  --ink-dim:#4b5768;
  --accent:#d85f22;
  --accent-dim:#f2c4a4;
  --essay:#8a4900;
  --term:#075a99;
  --mono: 'JetBrains Mono','Consolas',monospace;
  --sans: 'Pretendard','Noto Sans KR',-apple-system,BlinkMacSystemFont,sans-serif;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  min-height:100vh;
  padding-bottom:76px;
}
a{color:inherit; text-decoration:none;}
.wrap{max-width:900px;margin:0 auto;padding:24px 18px 60px;}

/* header */
.pagehead{border-bottom:2px solid var(--line); padding-bottom:16px; margin-bottom:20px;}
.eyebrow{font-family:var(--mono); font-size:12.5px; font-weight:700; letter-spacing:.12em; color:var(--accent); text-transform:uppercase; margin-bottom:6px;}
h1{font-size:25px; margin:0 0 8px; font-weight:800; letter-spacing:-0.01em; color:var(--ink);}
.sub{color:var(--ink-dim); font-size:15px; line-height:1.65;}
.stats{display:flex; gap:18px; margin-top:14px; flex-wrap:wrap; font-family:var(--mono); font-size:13px; color:var(--ink-dim); font-weight:600;}
.stats b{color:var(--ink); font-size:16.5px; font-family:var(--sans);}

/* section labels */
.section-label{font-family:var(--mono); font-size:13.5px; font-weight:700; color:var(--accent); letter-spacing:.06em; margin:26px 0 10px; text-transform:uppercase;}

/* book cards */
.book-grid{display:grid; grid-template-columns:1fr; gap:10px;}
.book-card{
  display:flex; align-items:center; gap:14px;
  background:var(--card); border:1.5px solid var(--line-strong); border-radius:10px;
  padding:14px 16px; transition:.15s;
  box-shadow:0 1px 2px rgba(20,30,45,.05);
}
.book-card:active, .book-card:hover{border-color:var(--accent); background:#fff7f1; box-shadow:0 2px 8px rgba(216,95,34,.14);}
.book-num{
  font-family:var(--mono); font-size:12px; color:#fff; background:var(--accent);
  width:32px; height:32px; border-radius:6px; display:flex; align-items:center; justify-content:center; flex-shrink:0; font-weight:700;
}
.book-info{flex:1; min-width:0;}
.book-title{font-size:15.5px; font-weight:700; font-family:var(--mono); word-break:break-all; color:var(--ink);}
.book-meta{font-size:13.5px; color:var(--ink-dim); margin-top:5px; font-weight:500;}
.book-arrow{color:var(--ink-dim); font-size:20px;}
.badge{
  font-family:var(--mono); font-size:11px; font-weight:700; padding:3px 8px; border-radius:20px;
  letter-spacing:.02em; margin-right:6px; display:inline-block;
}
.badge.essay{background:#fff1e2; color:var(--essay); border:1.5px solid #e3a35e;}
.badge.term{background:#e8f3fc; color:var(--term); border:1.5px solid #7fb8e6;}

/* back link */
.backlink{font-family:var(--mono); font-size:13px; font-weight:600; color:var(--ink-dim); display:inline-flex; align-items:center; gap:6px; margin-bottom:14px;}
.backlink:hover{color:var(--accent);}

/* tabs within book detail */
.subtabs{display:flex; gap:6px; margin:16px 0; border-bottom:2px solid var(--line);}
.subtab-btn{
  font-family:var(--mono); font-size:13.5px; font-weight:600; padding:9px 16px; cursor:pointer; color:var(--ink-dim);
  background:none; border:none; border-bottom:3px solid transparent; margin-bottom:-2px;
}
.subtab-btn.active{color:var(--accent); border-bottom-color:var(--accent); font-weight:700;}

/* sample gallery */
.sample-note{
  font-family:var(--mono); font-size:12.5px; color:var(--ink-dim); background:var(--paper2);
  border:1.5px dashed var(--line-strong); border-radius:8px; padding:11px 14px; margin-bottom:16px; line-height:1.7; font-weight:500;
}
.sample-note b{color:var(--accent);}
.sample-list{display:flex; flex-direction:column; gap:16px;}
.sample-img-wrap{border:1.5px solid var(--line-strong); border-radius:8px; overflow:hidden; background:#fff; box-shadow:0 1px 3px rgba(20,30,45,.08);}
.sample-img-wrap img{display:block; width:100%; height:auto;}
.sample-cap{font-family:var(--mono); font-size:12px; font-weight:600; color:var(--ink-dim); padding:7px 10px; background:var(--paper2); border-top:1px solid var(--line);}

/* toc list */
.toc-item{
  display:grid; grid-template-columns:52px 1fr auto; gap:12px; align-items:start;
  padding:13px 10px; border-bottom:1.5px solid var(--line);
}
.toc-item:hover{background:#fbfaf8;}
.toc-cat{font-family:var(--mono); font-size:11.5px; font-weight:700; color:var(--accent); margin-bottom:3px; letter-spacing:.02em;}
.toc-title{font-size:15.5px; line-height:1.5; color:var(--ink); font-weight:500;}
.toc-title mark{background:#ffe2c2; color:#7a3c00; padding:0 2px; border-radius:2px; font-weight:700;}
.toc-meta{text-align:right; font-family:var(--mono); font-size:12.5px; color:var(--ink-dim); white-space:nowrap; font-weight:600;}
.toc-meta .page{color:var(--accent); font-weight:700; font-size:15px; display:block;}
.toc-meta .file{display:block; max-width:150px; white-space:normal; margin-top:2px; font-size:11px;}

/* controls */
.controls{position:sticky; top:0; z-index:5; background:rgba(255,255,255,.97); padding:12px 0 14px; margin-bottom:6px; border-bottom:1.5px solid var(--line);}
input[type="text"]{
  width:100%; padding:14px 16px; font-size:16px; background:#fff; border:2px solid var(--line-strong);
  border-radius:8px; color:var(--ink); outline:none; font-family:var(--sans); font-weight:500;
}
input[type="text"]:focus{border-color:var(--accent);}
input[type="text"]::placeholder{color:#7a8494;}
.filters{display:flex; gap:8px; margin-top:10px; flex-wrap:wrap; align-items:center;}
.chip{
  font-family:var(--mono); font-size:13px; font-weight:600; padding:7px 13px; border:2px solid var(--line-strong); border-radius:20px;
  cursor:pointer; color:var(--ink-dim); background:#fff; user-select:none; transition:.15s;
}
.chip:hover{border-color:var(--accent); color:var(--ink);}
.chip.active{background:var(--accent); color:#fff; border-color:var(--accent); font-weight:700;}
select{
  font-family:var(--mono); font-size:13.5px; font-weight:600; padding:7px 11px; background:#fff; color:var(--ink);
  border:2px solid var(--line-strong); border-radius:20px; max-width:100%;
}
select.scope-select{
  border-color:var(--accent); color:var(--ink); font-weight:700; font-size:14.5px; background:#fff7f1;
}
select.scope-select:hover{background:#fff1e6;}
button.btn{
  font-family:var(--mono); font-size:13.5px; font-weight:700; padding:12px 20px; background:var(--accent);
  color:#fff; border:2px solid var(--accent); border-radius:8px; cursor:pointer; white-space:nowrap; transition:.15s;
}
button.btn:hover{background:#b84e1a; border-color:#b84e1a;}
#count{font-family:var(--mono); font-size:13px; font-weight:600; color:var(--ink-dim); margin:12px 0 8px; padding-left:22px;}
#count b{color:var(--accent);}
.empty{padding:50px 20px; text-align:center; color:var(--ink-dim); font-family:var(--mono); font-size:13.5px; font-weight:600;}
.hint{font-family:var(--mono); font-size:12px; color:var(--ink-dim); margin-top:8px; line-height:1.7;}

/* search row (toc-embedded + search page) */
.searchbar-row{display:flex; gap:8px; flex-wrap:wrap; align-items:stretch;}
.searchbar-row select{flex:0 0 auto;}
.searchbar-row input[type="text"]{flex:1; min-width:160px;}

/* search scope */
.scope-row{display:flex; gap:8px; align-items:center; flex-wrap:wrap; margin-bottom:10px;}
.scope-label{font-family:var(--mono); font-size:12.5px; font-weight:600; color:var(--ink-dim); margin-right:2px;}

/* footer */
footer{margin-top:36px; padding-top:14px; border-top:1.5px solid var(--line); font-family:var(--mono); font-size:12px; font-weight:500; color:var(--ink-dim); text-align:center; line-height:1.9;}
footer a{color:var(--accent); font-weight:700;}

/* cta */
.cta-box{
  margin-top:22px; padding:17px; border:2px solid var(--accent-dim); border-radius:10px; background:#fff8f2;
  font-size:14.5px; line-height:1.75; color:var(--ink); font-weight:500;
}
.cta-box b{color:var(--accent);}

/* tabbar */
.tabbar{
  position:fixed; bottom:0; left:0; right:0; display:flex; background:rgba(255,255,255,.98);
  border-top:1.5px solid var(--line); padding:6px 0 max(6px, env(safe-area-inset-bottom)); z-index:10;
  box-shadow:0 -1px 6px rgba(20,30,45,.06);
}
.tab{flex:1; display:flex; flex-direction:column; align-items:center; gap:3px; padding:8px 0; color:var(--ink-dim); font-size:12.5px; font-weight:600; font-family:var(--mono);}
.tab-ico{font-size:19px;}
.tab.active{color:var(--accent);}

@media (max-width:520px){
  .toc-item{grid-template-columns:40px 1fr; grid-template-rows:auto auto;}
  .toc-meta{grid-column:2; text-align:left; margin-top:4px;}
  .searchbar-row{flex-direction:column;}
}