:root{
  --bg:#0b1524;
  --bg-panel:#122033;
  --bg-panel-2:#0e1a2b;
  --grid-line: rgba(148,200,240,0.08);
  --grid-line-strong: rgba(148,200,240,0.16);
  --ink:#f1f5f9;
  --ink-dim:#d0dbe8;
  --ink-faint:#9aafc4;
  --blue:#7ec8f0;
  --blue-soft:rgba(126,200,240,0.14);
  --brand:#059669;
  --brand-fg:#ffffff;
  --brand-soft:rgba(5,150,105,0.16);
  --amber:#ffc46b;
  --amber-soft:rgba(255,196,107,0.12);
  --amber-line:rgba(255,196,107,0.45);
  --line:#243b55;
  --scrollbar-thumb:#35506c;
  --mono: 'JetBrains Mono', monospace;
  --display: 'Space Grotesk', sans-serif;
  --body: 'Inter', sans-serif;
}
/* Diazo / whiteprint theme — the light-mode counterpart of a blueprint */
html[data-theme="light"]{
  --bg:#eef3f8;
  --bg-panel:#ffffff;
  --bg-panel-2:#f3f7fb;
  --grid-line: rgba(43,108,176,0.06);
  --grid-line-strong: rgba(43,108,176,0.14);
  --ink:#16283b;
  --ink-dim:#4c637a;
  --ink-faint:#8298ac;
  --blue:#2b6cb0;
  --blue-soft:rgba(43,108,176,0.10);
  --brand:#059669;
  --brand-fg:#ffffff;
  --brand-soft:rgba(5,150,105,0.12);
  --amber:#b3690f;
  --amber-soft:rgba(179,105,15,0.10);
  --amber-line:rgba(179,105,15,0.4);
  --line:#d7e1ea;
  --scrollbar-thumb:#c3d2e0;
}
*{box-sizing:border-box;}
html{
  scroll-behavior:smooth;
  overflow-x:clip;
  max-width:100%;
}
::-webkit-scrollbar{width:10px; height:10px;}
::-webkit-scrollbar-track{background:transparent;}
::-webkit-scrollbar-thumb{background:var(--scrollbar-thumb); border-radius:6px;}
::-webkit-scrollbar-thumb:hover{background:var(--blue);}
*{scrollbar-width:thin; scrollbar-color:var(--scrollbar-thumb) transparent;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--body);
  line-height:1.5;
  transition:background .2s ease, color .2s ease;
  overflow-x:clip;
  max-width:100%;
}
a{color:var(--blue);}
::selection{background:var(--amber-soft); color:var(--ink);}

/* ---------- Title block ---------- */
.titleblock{
  position:relative;
  padding:22px 6vw 20px;
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg, rgba(94,177,232,0.05), transparent 70%);
  overflow:hidden;
}
.topbar{
  display:flex;
  flex-direction:row;
  flex-wrap:nowrap;
  align-items:center;
  gap:12px;
  margin-bottom:14px;
  min-width:0;
  width:100%;
}
.topbar .brand-lockup{ flex:0 0 auto; margin-right:0; min-width:0; }
.topbar .brand-logo{ height:32px; width:auto; max-height:32px; max-width:150px; }
.topbar-search{
  flex:1 1 0%;
  width:auto;
  min-width:0;
  max-width:none;
  background:var(--bg-panel); border:1px solid var(--line); color:var(--ink);
  padding:9px 14px; border-radius:8px; font-family:var(--body); font-size:13px;
}
.topbar-search:focus{outline:none; border-color:var(--blue);}
.topbar-search[type="search"]{-webkit-appearance:none; appearance:none;}
.topbar .theme-toggle{ flex:0 0 auto; }
.theme-toggle{
  font-family:var(--mono); font-size:16px; letter-spacing:0; text-transform:none;
  background:transparent; border:none; color:var(--ink-dim);
  width:36px; height:36px; padding:0; border-radius:6px; cursor:pointer; white-space:nowrap;
  display:inline-flex; align-items:center; justify-content:center; flex-shrink:0;
  line-height:1;
  transition:color .15s ease, opacity .15s ease;
}
.theme-toggle svg{
  width:20px; height:20px; display:block;
}
.theme-toggle:hover{border:none; color:var(--ink); opacity:.85;}
.theme-toggle:focus-visible{outline:2px solid var(--blue); outline-offset:2px;}
.titlerow{
  display:flex; align-items:flex-end; justify-content:space-between; gap:24px; flex-wrap:wrap;
}
.sheet-tag{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--blue);
  border:1px solid var(--grid-line-strong);
  display:inline-block;
  padding:4px 9px;
  border-radius:2px;
  text-transform:uppercase;
}
h1.doctitle{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(24px, 3.4vw, 36px);
  margin:10px 0 6px;
  letter-spacing:-0.01em;
  line-height:1.15;
}
h1.doctitle span{color:var(--blue);}
.subtitle{
  color:var(--ink-dim);
  font-size:14px;
  max-width:620px;
  margin:0 0 16px;
}
.statrow{
  display:flex; flex-wrap:wrap; gap:0;
  border:1px solid var(--line);
  border-radius:4px;
  overflow:hidden;
  width:fit-content;
}
.stat{
  padding:8px 16px;
  border-right:1px solid var(--line);
  text-align:left;
}
.stat:last-child{border-right:none;}
.stat b{
  display:block; font-family:var(--mono); font-size:16px; color:var(--amber);
}
.stat span{font-size:10px; color:var(--ink-faint); text-transform:uppercase; letter-spacing:.08em;}

/* ---------- layout ---------- */
.layout{
  display:grid;
  grid-template-columns:280px minmax(0, 1fr);
  gap:0;
  align-items:start;
  transition:grid-template-columns .2s ease;
  width:100%;
  max-width:100%;
  min-width:0;
}
.layout.collapsed{
  grid-template-columns:52px minmax(0, 1fr);
}
nav.rail{
  position:sticky; top:0;
  height:100vh;
  overflow-y:auto; overflow-x:hidden;
  padding:20px 14px 60px 6vw;
  border-right:1px solid var(--line);
  background:var(--bg-panel-2);
  transition:padding .2s ease;
  min-width:0;
}
.layout.collapsed nav.rail{padding:20px 8px;}
.layout.collapsed nav.rail .rail-hide{display:none;}
.rail-top{display:flex; align-items:center; justify-content:space-between; margin-bottom:14px;}
.rail-collapse-btn{
  background:var(--bg-panel); border:1px solid var(--line); color:var(--ink-dim);
  width:26px; height:26px; border-radius:4px; cursor:pointer; font-family:var(--mono);
  font-size:13px; flex:none; display:flex; align-items:center; justify-content:center;
}
.rail-collapse-btn:hover{border-color:var(--blue); color:var(--ink);}
nav.rail h4{
  font-family:var(--mono); font-size:11px; letter-spacing:.12em;
  color:var(--ink-faint); text-transform:uppercase; margin:0 0 10px 6px;
}
#searchbox{
  width:100%;
  background:var(--bg-panel);
  border:1px solid var(--line);
  color:var(--ink);
  padding:9px 10px;
  border-radius:4px;
  font-family:var(--body);
  font-size:13px;
  margin-bottom:16px;
}
#searchbox:focus{outline:none; border-color:var(--blue);}
.raillink{
  display:flex; gap:8px; align-items:baseline;
  font-size:12.5px; padding:6px 6px; border-radius:3px;
  color:var(--ink-dim); text-decoration:none;
  border-left:2px solid transparent;
  min-width:0;
}
.raillink span:last-child{
  overflow-wrap:anywhere;
}
.raillink:hover{background:var(--blue-soft); color:var(--ink); border-left-color:var(--blue);}
.raillink .rno{font-family:var(--mono); color:var(--blue); font-size:11px; min-width:26px;}
.raillink.dedicated{color:var(--amber);}
.raillink.dedicated .rno{color:var(--amber);}
.rail-actions{margin-top:18px; display:flex; flex-direction:column; gap:8px;}
.rail-btn{
  font-family:var(--mono); font-size:11px; text-transform:uppercase; letter-spacing:.06em;
  background:transparent; border:1px solid var(--line); color:var(--ink-dim);
  padding:9px 10px; border-radius:4px; cursor:pointer; text-align:left;
}
.rail-btn:hover{border-color:var(--blue); color:var(--ink);}
.rail-btn-link{
  text-decoration:none;
  display:block;
}

main{
  padding:40px 6vw 100px 40px;
  min-width:0;
  width:100%;
  max-width:100%;
  overflow-x:clip;
}
@media (max-width:900px){ main{padding:24px 4vw 80px;} }

/* ---------- volume blocks ---------- */
.volume{
  margin-bottom:22px;
  border:1px solid var(--line);
  border-radius:6px;
  background:var(--bg-panel);
  scroll-margin-top:20px;
}
.volume.dedicated{
  border-color:var(--amber-line);
  background:linear-gradient(180deg, var(--amber-soft), var(--bg-panel) 40%);
}
.vol-head{
  display:flex; align-items:center; gap:16px;
  padding:18px 20px;
  cursor:pointer;
  list-style:none;
  user-select:none;
}
.vol-head::-webkit-details-marker{display:none;}
.vol-num{
  font-family:var(--mono); font-size:13px; color:var(--blue);
  border:1px solid var(--grid-line-strong); border-radius:3px;
  padding:4px 10px; white-space:nowrap;
  flex-shrink:0;
}
.dedicated .vol-num{color:var(--amber); border-color:var(--amber-line);}
.vol-title{
  font-family:var(--display); font-weight:600; font-size:19px; flex:1;
  min-width:0;
  line-height:1.25;
}
.vol-badge{
  font-family:var(--mono); font-size:10px; letter-spacing:.08em; text-transform:uppercase;
  color:var(--amber); border:1px solid var(--amber-line); background:var(--amber-soft);
  padding:3px 8px; border-radius:20px;
}
.chev{
  font-family:var(--mono);
  color:var(--ink-dim);
  transition:color .15s ease, transform .15s ease;
  font-size:28px;
  line-height:1;
  min-width:36px;
  flex-shrink:0;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:6px;
}
.vol-head:hover .chev{color:var(--blue);}
.volume.dedicated .vol-head:hover .chev{color:var(--amber);}
details[open] > .vol-head .chev{transform:rotate(90deg);}
.vol-note{
  padding:0 20px 14px 20px;
  margin-top:-6px;
  color:var(--ink-dim); font-size:13.5px; max-width:800px;
}
.vol-body{
  padding:4px 20px 20px;
  border-top:1px dashed var(--line);
}

.module{margin:16px 0 0;}
.mod-head{
  display:flex; align-items:center; gap:10px; cursor:pointer; list-style:none; padding:8px 0;
}
.mod-head::-webkit-details-marker{display:none;}
.mod-num{font-family:var(--mono); font-size:11.5px; color:var(--ink-faint); min-width:44px;}
.mod-title{font-family:var(--body); font-weight:600; font-size:14.5px; color:var(--ink);}
.mod-chev{
  font-family:var(--mono);
  color:var(--ink-dim);
  font-size:22px;
  line-height:1;
  min-width:30px;
  flex-shrink:0;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:4px;
  transition:color .15s ease, transform .15s ease;
}
.mod-head:hover .mod-chev{color:var(--blue);}
details[open] > .mod-head .mod-chev{transform:rotate(90deg);}
.mod-items{
  padding:6px 0 6px 54px;
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(210px, 1fr));
  gap:4px 18px;
}
.term{
  font-size:13px; color:var(--ink-dim);
  padding:3px 0;
  border-bottom:1px solid transparent;
  position:relative; padding-left:14px;
}
.term::before{
  content:"·"; position:absolute; left:0; color:var(--blue); font-weight:700;
}
.term.hit{color:var(--ink); background:var(--amber-soft); border-radius:3px; padding-left:14px;}
.term.hidden{display:none;}
.module.hidden{display:none;}
.volume.hidden{display:none;}

/* ---------- appendix ---------- */
.appendix-head{
  margin:60px 0 20px;
  padding-top:30px;
  border-top:2px solid var(--line);
}
.appendix-head .sheet-tag{margin-bottom:14px;}
.appendix-head h2{font-family:var(--display); font-size:30px; margin:6px 0;}
.appendix-head p{color:var(--ink-dim); max-width:720px; font-size:14.5px;}

.app-grid{display:grid; grid-template-columns:1fr 1fr; gap:20px; margin-bottom:24px;}
@media (max-width:760px){.app-grid{grid-template-columns:1fr;}}
.card{
  border:1px solid var(--line); border-radius:6px; background:var(--bg-panel); padding:20px;
}
.card h3{font-family:var(--mono); font-size:13px; letter-spacing:.06em; color:var(--blue); text-transform:uppercase; margin:0 0 12px;}
.card ul{margin:0; padding-left:18px; font-size:13.5px; color:var(--ink-dim);}
.card li{margin-bottom:6px;}
.card b{color:var(--ink);}

.indexbar{
  display:flex; justify-content:space-between; align-items:center; margin:34px 0 14px;
  flex-wrap:wrap; gap:12px;
}
.indexbar-title{
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--blue);
  text-transform:uppercase;
  margin:0;
}
#azsearch{
  background:var(--bg-panel); border:1px solid var(--line); color:var(--ink);
  padding:9px 12px; border-radius:4px; font-size:13px; width:260px; font-family:var(--body);
}
#azsearch:focus{outline:none; border-color:var(--blue);}
.az-letters{display:flex; flex-wrap:wrap; gap:4px; margin-bottom:18px;}
.az-letters a{
  font-family:var(--mono); font-size:11px; color:var(--ink-faint); border:1px solid var(--line);
  padding:4px 8px; border-radius:3px; text-decoration:none;
}
.az-letters a:hover{color:var(--blue); border-color:var(--blue);}
.az-columns{
  columns:3; column-gap:34px;
}
@media (max-width:900px){.az-columns{columns:2;}}
@media (max-width:600px){.az-columns{columns:1;}}
.az-group{break-inside:avoid; margin-bottom:22px;}
.az-letter{
  font-family:var(--display); font-size:20px; color:var(--amber); border-bottom:1px solid var(--amber-line);
  padding-bottom:4px; margin-bottom:8px;
}
.az-entry{font-size:12.8px; color:var(--ink-dim); padding:2px 0; line-height:1.4;}
.az-entry b{color:var(--ink); font-weight:500;}
.az-entry .ref{color:var(--ink-faint); font-family:var(--mono); font-size:10.5px;}
.az-entry.hidden{display:none;}

/* ---------- Codextroop brand ---------- */
.brand-lockup{
  display:inline-flex; align-items:center; gap:10px; flex-wrap:nowrap;
  text-decoration:none; color:inherit; flex-shrink:0; white-space:nowrap;
}
.brand-lockup:hover{ opacity:.92; }
.brand-logo{
  height:28px; width:auto; max-width:140px;
  object-fit:contain; object-position:left center; display:block;
}
.brand-badge{
  display:inline-flex; align-items:center;
  font-family:var(--mono); font-size:10px; font-weight:700;
  letter-spacing:.06em; text-transform:uppercase;
  background:var(--brand); color:#ffffff;
  padding:4px 9px; border-radius:999px; white-space:nowrap;
}
.brand-lockup .brand-badge{ color:#ffffff; }
html[data-theme="light"] .brand-badge{ color:#ffffff; }
.brand-footer{
  display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between;
  gap:16px 24px;
}
.brand-footer-lockup{
  display:flex; align-items:center; gap:12px; flex-wrap:wrap;
}
.brand-footer-meta{
  color:var(--ink-faint); font-size:11px; line-height:1.5;
}
.brand-footer-meta a{ color:var(--brand); text-decoration:none; }
.brand-footer-meta a:hover{ text-decoration:underline; }
.brand-footer-links{
  display:flex; flex-wrap:wrap; gap:14px 18px;
}
.brand-footer-links a{
  color:var(--ink-dim); text-decoration:none; font-size:11px;
}
.brand-footer-links a:hover{ color:var(--brand); }

footer{
  padding:30px 6vw 60px; border-top:1px solid var(--line); color:var(--ink-faint); font-size:12px;
  font-family:var(--mono);
}
footer .site-disclaimer{
  max-width:720px; margin:0 0 12px; line-height:1.55; color:var(--ink-dim); font-size:12px;
}

.empty-msg{color:var(--ink-faint); font-size:13px; padding:14px 0; display:none;}

.rail-top-title{margin:0;}

.term-link{color:inherit;text-decoration:none;}
.term-link:hover{color:var(--ink);text-decoration:underline;text-decoration-color:var(--blue);}

.vol-page-action{
  display:flex; align-items:center; gap:12px; flex-wrap:wrap;
  padding:0 20px 14px; margin-top:-4px;
}
.vol-page-link{
  font-family:var(--mono); font-size:11px; letter-spacing:.06em; text-transform:uppercase;
  color:var(--blue); text-decoration:none; border:1px solid var(--grid-line-strong);
  padding:6px 10px; border-radius:4px;
}
.vol-page-link:hover{background:var(--blue-soft); border-color:var(--blue);}
.vol-page-hint{font-size:12px; color:var(--ink-faint);}

/* ---------- Mobile / tablet ---------- */
@media (max-width:900px){
  .titleblock{padding:16px 4vw 14px;}
  .topbar{gap:10px;}
  .topbar .brand-logo{height:28px; max-height:28px; max-width:120px;}
  .titlerow{gap:16px;}
  .subtitle{margin-bottom:8px; font-size:13px;}
  .statrow{width:100%;}
  .stat{flex:1 1 40%; padding:8px 12px;}

  .layout,
  .layout.collapsed{
    display:flex !important;
    flex-direction:column;
    grid-template-columns:none !important;
  }

  nav.rail{
    position:static !important;
    height:auto !important;
    max-height:none !important;
    width:100%;
    border-right:none;
    border-bottom:1px solid var(--line);
    padding:12px 4vw 14px;
  }
  .layout.collapsed nav.rail{padding:12px 4vw 14px;}
  .layout.collapsed nav.rail .rail-hide{display:block;}
  .rail-collapse-btn{display:none;}
  nav.rail .rail-hide{
    display:none;
  }
  nav.rail.rail-open .rail-hide{
    display:block;
  }
  .rail-top{
    margin-bottom:0;
  }
  .rail-top::after{
    content:none;
  }
  .rail-mobile-toggle{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    width:100%;
    font-family:var(--mono);
    font-size:11px;
    letter-spacing:.06em;
    text-transform:uppercase;
    background:var(--bg-panel);
    border:1px solid var(--line);
    color:var(--ink-dim);
    padding:10px 12px;
    border-radius:6px;
    cursor:pointer;
  }
  .rail-mobile-toggle:hover{
    border-color:var(--brand);
    color:var(--ink);
  }

  main{
    padding:20px 4vw 72px !important;
    width:100%;
    max-width:100%;
    min-width:0;
  }

  .volume{margin-bottom:14px;}
  .vol-head{
    gap:10px;
    padding:14px 14px;
    align-items:flex-start;
  }
  .vol-num{font-size:11px; padding:3px 8px;}
  .vol-title{font-size:16px;}
  .vol-badge{display:none;}
  .chev{font-size:22px; min-width:28px; padding:2px;}
  .vol-note{padding:0 14px 12px; font-size:13px;}
  .vol-body{padding:4px 14px 16px;}

  .mod-items{
    grid-template-columns:1fr;
    padding-left:12px;
  }
  .mod-num{min-width:40px;}

  .appendix-head h2{font-size:24px;}
  #azsearch{width:100%; max-width:100%;}

  .brand-footer{
    flex-direction:column;
    align-items:flex-start;
  }
  footer{padding:24px 4vw 48px;}
}

@media (max-width:600px){
  .topbar{gap:8px;}
  .topbar .brand-logo{height:24px; max-height:24px; max-width:100px;}
  .brand-badge{display:none;}
  .stat{flex:1 1 45%;}
  .stat:nth-child(odd){border-right:1px solid var(--line);}
  h1.doctitle{font-size:22px;}
  .sheet-tag{font-size:10px; letter-spacing:.1em;}
}

@media (min-width:901px){
  .rail-mobile-toggle{display:none;}
}