/* ============================================================
   CODEX OF... — global stylesheet
   Aesthetic: blueprint / schematic codex
   3 style variants on <html data-style="blueprint|manuscript|schema">
   ============================================================ */

:root{
  --gold:        #d4a24c;
  --gold-soft:   #b88a3d;
  --gold-dim:    #6f5223;
  --crimson:     #8b1f1f;
  --crimson-dim: #4a1212;
  --ink:         #0c0a07;
  --ink-2:       #15110a;
  --paper:       #ece4cf;
  --paper-dim:   #b5ac95;
  --line:        rgba(212,162,76,.32);
  --line-strong: rgba(212,162,76,.55);
  --rule:        rgba(212,162,76,.16);
  --grid:        rgba(212,162,76,.07);
  --shadow-page: 0 12px 28px -14px rgba(0,0,0,.8);

  --font-sans:  "Liberation Sans","Helvetica Neue",Arial,sans-serif;
  --font-mono:  "Liberation Mono","JetBrains Mono",ui-monospace,Menlo,monospace;
  --font-display: "Liberation Sans","Helvetica Neue",Arial,sans-serif;

  --pad-page: clamp(20px, 3vw, 48px);
  --maxw: 1280px;
}

/* ---------- Variant: Manuscript (warm parchment-black, gilded) ---------- */
html[data-style="manuscript"]{
  --gold:      #e0b25a;
  --gold-soft: #c3933e;
  --crimson:   #7a1a1a;
  --ink:       #100a05;
  --ink-2:     #1a1108;
  --line:      rgba(224,178,90,.36);
  --line-strong: rgba(224,178,90,.62);
  --grid:      rgba(224,178,90,.05);
}

/* ---------- Variant: Schema (slate, recipe-card hatch) ---------- */
html[data-style="schema"]{
  --gold:      #c9a14a;
  --crimson:   #913030;
  --ink:       #0a0d10;
  --ink-2:     #11161b;
  --line:      rgba(201,161,74,.28);
  --line-strong: rgba(201,161,74,.55);
  --grid:      rgba(201,161,74,.05);
}

/* ---------- reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html,body{ margin:0; padding:0; }
html{ background: var(--ink); color: var(--paper); font-family: var(--font-sans); }
body{
  min-height: 100vh;
  background: linear-gradient(var(--ink), var(--ink-2));
  font-size: 15px;
  line-height: 1.55;
  letter-spacing: .005em;
  color: var(--paper);
}

/* fixed atmosphere layer: radial glows + blueprint grid.
   CPU-friendly: no mask/filter/forced layer — edge fade is baked into an
   ink vignette gradient instead of an expensive mask-image */
body::before{
  content:"";
  position:fixed; inset:0;
  pointer-events:none;
  background-image:
    radial-gradient(1200px 700px at 20% -10%, rgba(212,162,76,.06), transparent 60%),
    radial-gradient(900px 600px at 110% 110%, rgba(139,31,31,.05), transparent 60%),
    radial-gradient(ellipse 90% 85% at center, transparent 45%, var(--ink) 100%),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 100% 100%, 32px 32px, 32px 32px;
  z-index: 0;
}
html[data-style="schema"] body::before{
  background-image:
    radial-gradient(1200px 700px at 20% -10%, rgba(212,162,76,.06), transparent 60%),
    radial-gradient(900px 600px at 110% 110%, rgba(139,31,31,.05), transparent 60%),
    radial-gradient(ellipse 90% 85% at center, transparent 45%, var(--ink) 100%),
    repeating-linear-gradient(45deg, var(--grid) 0 1px, transparent 1px 8px),
    repeating-linear-gradient(-45deg, var(--grid) 0 1px, transparent 1px 8px);
  background-size: 100% 100%, 100% 100%, 100% 100%, auto, auto;
}

/* ---------- typography ---------- */
h1,h2,h3,h4{ font-family: var(--font-display); font-weight: 700; color: var(--paper); margin:0; letter-spacing:.01em; }
h1{ font-size: clamp(28px, 3.4vw, 44px); line-height: 1.1; }
h2{ font-size: 22px; line-height: 1.25; }
h3{ font-size: 16px; line-height: 1.3; text-transform: uppercase; letter-spacing: .14em; color: var(--gold); }
h4{ font-size: 14px; text-transform: uppercase; letter-spacing: .18em; color: var(--gold-soft); font-weight:600;}
p{ margin: 0 0 1em; color: var(--paper); }
a{ color: var(--gold); text-decoration: none; }
a:hover{ color: var(--paper); }
small{ font-size: 12px; color: var(--paper-dim); }
.mono{ font-family: var(--font-mono); }
.label{
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .22em;
  color: var(--gold-soft);
}
.hr-rule{ border:0; border-top:1px solid var(--rule); margin: 24px 0; }

/* ---------- layout shell ---------- */
.shell{ position:relative; z-index:1; max-width: var(--maxw); margin:0 auto; padding: 0 var(--pad-page); }

/* top bar */
.topbar{
  position: sticky; top:0; z-index: 50;
  background: var(--ink);
  border-bottom: 1px solid var(--rule);
}
.topbar-inner{
  display:flex; align-items:center; gap: 28px;
  padding: 14px var(--pad-page);
  max-width: var(--maxw); margin: 0 auto;
}
.brand{ display:flex; align-items:center; gap: 12px; }
.brand-mark{
  width: 34px; height: 34px;
  background: url("logo-sm.png") center/contain no-repeat;
}
.brand-name{
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: .35em; text-transform: uppercase;
  color: var(--gold);
}
nav.nav{ display:flex; gap: 4px; margin-left: auto; flex-wrap:wrap; }
nav.nav a{
  display:inline-flex; align-items:center; gap:8px;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--paper-dim);
  border: 1px solid transparent;
  border-radius: 2px;
  transition: color .15s, border-color .15s, background .15s;
}
nav.nav a:hover{ color: var(--paper); border-color: var(--rule); }
nav.nav a[aria-current="page"]{
  color: var(--gold);
  border-color: var(--line-strong);
  background: rgba(212,162,76,.06);
}

/* page frame with corner brackets */
.frame{
  position: relative;
  margin: 36px 0 80px;
  padding: 28px clamp(20px, 3vw, 44px);
  border: 1px solid var(--line);
  background:
    linear-gradient(rgba(0,0,0,.25), rgba(0,0,0,.25));
  border-radius: 2px;
}
.frame::before, .frame::after,
.frame > .br-tl, .frame > .br-tr, .frame > .br-bl, .frame > .br-br{
  position:absolute; width: 14px; height: 14px;
  border-color: var(--gold);
}
.frame > .br-tl{ top:-1px; left:-1px; border-top:2px solid; border-left:2px solid; }
.frame > .br-tr{ top:-1px; right:-1px; border-top:2px solid; border-right:2px solid; }
.frame > .br-bl{ bottom:-1px; left:-1px; border-bottom:2px solid; border-left:2px solid; }
.frame > .br-br{ bottom:-1px; right:-1px; border-bottom:2px solid; border-right:2px solid; }
.frame > .br-tl, .frame > .br-tr, .frame > .br-bl, .frame > .br-br{ content:""; display:block; }

/* page header */
.page-head{
  display:flex; align-items: flex-end; justify-content: space-between; gap: 24px;
  padding: 28px 0 18px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 28px;
}
.page-head .page-meta{ font-family: var(--font-mono); color: var(--paper-dim); font-size: 11px; letter-spacing:.2em; text-transform:uppercase;}
.page-head h1{ display:flex; align-items: baseline; gap: 16px; }
.page-head h1 .num{ color: var(--gold); font-family: var(--font-mono); font-size: .5em; letter-spacing:.2em; }

/* breadcrumb chip */
.crumbs{ font-family: var(--font-mono); font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: var(--paper-dim); }
.crumbs a{ color: var(--paper-dim); }
.crumbs a:hover{ color: var(--gold); }

/* ---------- two-column rules layout ---------- */
.rules-grid{
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}
@media (max-width: 900px){
  .rules-grid{ grid-template-columns: 1fr; }
  .toc{ position: static !important; }
}

.toc{
  position: sticky; top: 88px;
  border-left: 1px solid var(--line);
  padding: 8px 0 8px 16px;
  max-height: calc(100vh - 110px);
  overflow:auto;
}
.toc h4{ margin-bottom: 12px; }
.toc ol{ list-style:none; padding:0; margin:0; counter-reset: toc; }
.toc li{ counter-increment: toc; margin: 0; }
.toc li > a{
  display:flex; gap:10px; align-items:baseline;
  padding: 6px 0;
  font-size: 13px; color: var(--paper-dim);
  border-bottom: 1px dashed transparent;
  transition: color .15s;
}
.toc li > a::before{
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .15em;
  color: var(--gold-dim); flex: 0 0 auto;
}
.toc li > a:hover{ color: var(--paper); }
.toc li > a.active{ color: var(--gold); }
.toc ul{ list-style:none; padding: 4px 0 6px 22px; margin:0; }
.toc ul li a{ font-size: 12px; padding: 3px 0; }

.content{ min-width:0; }
.content section{ scroll-margin-top: 80px; padding-bottom: 28px; }
.content section + section{ border-top: 1px solid var(--rule); padding-top: 28px; }
.content h2{
  display:flex; align-items: baseline; gap: 14px;
  margin-bottom: 14px;
}
.content h2 .num{
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .25em;
  color: var(--gold); padding: 4px 8px; border:1px solid var(--line);
  align-self:center;
}
.content h3{ margin: 22px 0 8px; }
.content p{ max-width: 70ch; }
.content ul{ padding-left: 20px; max-width: 72ch; }
.content ul li{ margin: 4px 0; }
.content ul li::marker{ color: var(--gold-soft); }

/* callout block — schematic note */
.note{
  margin: 18px 0;
  padding: 14px 16px;
  border: 1px dashed var(--line-strong);
  border-left: 2px solid var(--gold);
  background: rgba(212,162,76,.04);
  font-size: 13px;
  position: relative;
}
.note::before{
  content: attr(data-tag);
  position:absolute; top:-9px; left:14px;
  background: var(--ink-2); padding: 0 6px;
  font-family: var(--font-mono); font-size: 10px; letter-spacing:.22em;
  color: var(--gold); text-transform: uppercase;
}

.warn{ border-left-color: var(--crimson); }
.warn::before{ color: var(--crimson); }

/* schematic table */
table.schematic{
  width: 100%; border-collapse: collapse;
  font-family: var(--font-mono); font-size: 12px;
  margin: 14px 0;
}
table.schematic th, table.schematic td{
  text-align: left; padding: 8px 12px;
  border-bottom: 1px solid var(--rule);
}
table.schematic th{
  font-weight: 600; color: var(--gold); text-transform: uppercase;
  letter-spacing: .15em; font-size: 10px;
  border-bottom: 1px solid var(--line-strong);
}
table.schematic tr:hover td{ background: rgba(212,162,76,.04); }

/* ---------- tweaks panel ---------- */
.tweaks{
  position: fixed; right: 18px; bottom: 18px; z-index: 100;
  width: 280px;
  background: rgba(20,15,8,.98);
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono); font-size: 11px;
  color: var(--paper);
  display: none;
}
.tweaks.open{ display:block; }
.tweaks .head{
  display:flex; align-items:center; justify-content:space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--rule);
  letter-spacing: .25em; text-transform: uppercase; color: var(--gold);
}
.tweaks .head button{
  background: none; border:0; color: var(--paper-dim); cursor:pointer;
  font-family: inherit; font-size: 16px; line-height: 1;
}
.tweaks .body{ padding: 14px; display:flex; flex-direction: column; gap: 14px; }
.tweaks label.tlabel{ display:block; color: var(--paper-dim); letter-spacing:.2em; text-transform: uppercase; margin-bottom: 8px; font-size: 10px; }
.tweaks .seg{ display:flex; gap: 6px; }
.tweaks .seg button{
  flex:1; padding: 8px 10px;
  background: transparent; border:1px solid var(--rule); color: var(--paper-dim);
  font-family: inherit; font-size: 10px; letter-spacing: .18em; text-transform: uppercase;
  cursor: pointer; transition: all .15s;
}
.tweaks .seg button:hover{ color: var(--paper); border-color: var(--line); }
.tweaks .seg button.on{ color: var(--ink); background: var(--gold); border-color: var(--gold); }

/* ---------- footer ---------- */
.foot{
  margin-top: 60px; padding: 24px var(--pad-page) 40px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono); font-size: 11px; letter-spacing:.18em; text-transform: uppercase;
  color: var(--paper-dim);
  display:flex; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}

/* ---------- utility ---------- */
.row{ display:flex; gap: 16px; flex-wrap: wrap; }
.col{ display:flex; flex-direction: column; gap: 16px; }
.spread{ display:flex; justify-content:space-between; align-items: center; gap: 16px; }
.tag{
  display:inline-block; padding: 3px 8px;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .2em; text-transform:uppercase;
  border: 1px solid var(--line); color: var(--gold-soft);
}
.tag.crimson{ color: var(--crimson); border-color: rgba(139,31,31,.55); }

/* ---------- bookshelf landing (index page) ---------- */
.shelf-stage{
  position: relative;
  padding: 56px 0 24px;
}
.shelf-stage .quill-line{
  text-align:center; color: var(--paper-dim); font-family: var(--font-mono);
  font-size: 11px; letter-spacing: .35em; text-transform: uppercase;
  margin-bottom: 28px;
}
.shelf-stage .stage-title{
  text-align:center;
  font-size: clamp(36px, 5vw, 64px);
  letter-spacing: .04em;
  margin-bottom: 8px;
}
.shelf-stage .stage-sub{
  text-align:center;
  max-width: 600px; margin: 0 auto 40px;
  color: var(--paper-dim);
}

.shelf{
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 240px));
  justify-content: center;
  gap: 14px;
  padding: 36px 24px 8px;
  margin: 0 auto;
  max-width: 880px;
  perspective: 1200px;
}
.shelf::after{
  content:"";
  position: absolute;
  left: 4%; right: 4%; bottom: 0; height: 14px;
  border-top: 1px solid var(--line-strong);
  background:
    repeating-linear-gradient(90deg, var(--rule) 0 1px, transparent 1px 12px);
}
.shelf::before{
  /* dimension annotation under the shelf */
  content: "SHELF · 03 VOLUMES · INDEX A";
  position: absolute;
  left:0; right:0; bottom: -22px;
  text-align:center;
  font-family: var(--font-mono); font-size: 10px; letter-spacing:.35em;
  color: var(--gold-dim); text-transform:uppercase;
}

.book{
  position: relative;
  display:flex; flex-direction:column;
  height: 360px;
  padding: 22px 18px 18px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(20,15,8,.85), rgba(10,8,5,.95));
  color: var(--paper);
  text-decoration: none;
  transform-origin: bottom center;
  transition: transform .35s cubic-bezier(.2,.7,.2,1), border-color .2s, box-shadow .35s;
  overflow: hidden;
}
.book::before{
  content:""; position:absolute; inset: 6px;
  border: 1px dashed var(--line);
  pointer-events:none;
}
.book::after{
  /* spine highlight — gilt edge on the left */
  content:""; position:absolute; left:0; top:0; bottom:0; width: 4px;
  background: linear-gradient(180deg, transparent, var(--gold), transparent);
  opacity: .55;
}
.book .b-num{ font-family: var(--font-mono); font-size:10px; letter-spacing:.3em; color: var(--gold-dim); }
.book .b-title{
  margin-top: 14px;
  font-size: 24px; line-height: 1.05; letter-spacing: .02em;
  color: var(--paper);
  text-transform: uppercase;
}
.book .b-sub{ margin-top: 6px; color: var(--gold); font-family: var(--font-mono); font-size: 11px; letter-spacing: .22em; text-transform:uppercase; }
.book .b-glyph{
  margin: 22px auto 18px; flex: 1 1 auto;
  display:flex; align-items:center; justify-content:center;
}
.book .b-glyph svg{ width: 90px; height: 90px; }
.book .b-foot{
  display:flex; justify-content:space-between; align-items:flex-end;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .22em; text-transform:uppercase;
  color: var(--paper-dim);
}
.book .b-foot .arrow{
  display:inline-block; padding: 4px 8px; border:1px solid var(--gold);
  color: var(--gold);
}

/* fan: tilt each book slightly */
.shelf .book:nth-child(1){ transform: rotate(-2.6deg) translateY(6px); }
.shelf .book:nth-child(2){ transform: rotate(0deg)    translateY(-4px); }
.shelf .book:nth-child(3){ transform: rotate(2.6deg)  translateY(6px); }
.shelf .book:hover{
  transform: rotate(0deg) translateY(-14px);
  border-color: var(--gold);
  box-shadow: 0 10px 20px -10px rgba(0,0,0,.7), 0 0 0 1px rgba(212,162,76,.35) inset;
}
.shelf .book.crimson::after{ background: linear-gradient(180deg, transparent, var(--crimson), transparent); }
.shelf .book.crimson .b-sub{ color: var(--crimson); }
.shelf .book.crimson .b-foot .arrow{ border-color: var(--crimson); color: var(--crimson); }

/* secondary chips below shelf */
.aux-shelf{
  margin: 90px auto 0; max-width: 880px;
  display:grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px;
}
.aux-tile{
  display:flex; align-items:center; gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,.25);
  transition: border-color .15s, background .15s;
}
.aux-tile:hover{ border-color: var(--gold); background: rgba(212,162,76,.05); }
.aux-tile .at-icon{
  width: 28px; height: 28px; border:1px solid var(--gold-soft);
  display:grid; place-items:center; color: var(--gold);
  font-family: var(--font-mono); font-size: 11px;
}
.aux-tile .at-meta{ display:flex; flex-direction: column; gap: 2px; }
.aux-tile .at-meta b{ color: var(--paper); font-weight: 600; letter-spacing: .04em; font-size: 13px; }
.aux-tile .at-meta span{ color: var(--paper-dim); font-family: var(--font-mono); font-size: 10px; letter-spacing: .22em; text-transform: uppercase; }

/* annotation marks (decorative) */
.annot{
  position: absolute;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--gold-dim);
  pointer-events: none;
}
.annot::before{
  content:""; display:inline-block; vertical-align: middle;
  width: 24px; height: 1px; background: var(--gold-dim); margin-right: 8px;
}

/* news / changelog cards */
.timeline{ display:flex; flex-direction:column; }
.entry{
  display: grid; grid-template-columns: 160px 1fr; gap: 28px;
  padding: 22px 0; border-bottom: 1px solid var(--rule);
}
.entry .when{
  font-family: var(--font-mono); font-size: 11px; letter-spacing:.18em; text-transform:uppercase;
  color: var(--gold);
}
.entry h2{ font-size: 18px; }
.entry .badges{ margin-top: 8px; display:flex; gap: 8px; flex-wrap:wrap; }

/* paragraphs index */
.paras{
  display:grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px;
  margin-top: 18px;
}
.para{
  padding: 18px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,.25);
  display:flex; flex-direction:column; gap: 8px;
  transition: border-color .15s, background .15s;
  position: relative;
}
.para:hover{ border-color: var(--gold); background: rgba(212,162,76,.04);}
.para .pid{ font-family: var(--font-mono); font-size: 10px; letter-spacing:.25em; color: var(--gold); }
.para h3{ color: var(--paper); text-transform: none; letter-spacing: 0; font-size: 16px; }
.para p{ color: var(--paper-dim); font-size: 13px; margin: 0; }
.para .ptag{ position:absolute; top: 14px; right: 14px; }

/* pager (prev/next on rule pages) */
.pager{
  display:flex; gap: 14px; margin-top: 36px;
}
.pager a{
  flex:1; padding: 14px 18px;
  border: 1px solid var(--line);
  display:flex; flex-direction: column; gap: 4px;
  transition: border-color .15s, background .15s;
}
.pager a:hover{ border-color: var(--gold); background: rgba(212,162,76,.04); }
.pager a.next{ text-align:right; align-items: flex-end; }
.pager a .dir{ font-family: var(--font-mono); font-size: 10px; letter-spacing:.22em; text-transform:uppercase; color: var(--gold-soft); }
.pager a .ttl{ color: var(--paper); font-weight: 600; }

/* progress bar at top of rule pages */
.read-prog{
  position: sticky; top: 64px; z-index: 5;
  height: 2px; background: transparent;
  margin: 0 calc(-1 * var(--pad-page));
}
.read-prog > div{
  height: 100%; width: 0; background: var(--gold);
  transition: width .1s linear;
}

/* selection */
::selection{ background: rgba(212,162,76,.35); color: var(--paper); }

/* scrollbar */
::-webkit-scrollbar{ width: 10px; height: 10px; }
::-webkit-scrollbar-thumb{ background: rgba(212,162,76,.25); border-radius: 0;}
::-webkit-scrollbar-thumb:hover{ background: rgba(212,162,76,.45); }
::-webkit-scrollbar-track{ background: transparent; }

/* topbar tweaks toggle button */
.tweaks-btn{
  margin-left: 8px;
  background: none;
  border: 1px solid transparent;
  color: var(--gold-dim);
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
  border-radius: 2px;
  flex-shrink: 0;
  line-height: 1;
}
.tweaks-btn:hover{
  color: var(--gold);
  border-color: var(--rule);
}
.tweaks-btn.active{
  color: var(--gold);
  border-color: var(--line-strong);
  background: rgba(212,162,76,.06);
}
