/* Ledger — IT documentation & knowledge hub. Plain CSS, no build.
   Brand: "the bound ledger book / archive." Ink navy + aged parchment +
   brass/gold-leaf + oxblood, Fraunces display, JetBrains Mono for the
   markdown/git substrate story, a recurring left-rail "spine," pages-turn motif. */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,600;9..144,700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@500;600&display=swap');
:root {
  --ink: #13233A;          /* primary text/bg — ink navy */
  --ink-d: #0c1726;
  --ink-l: #20395a;
  --parch: #F4EEE2;        /* aged parchment background */
  --parch-d: #ece3d2;
  --brass: #C9A227;        /* accent — gold-leaf "ledger spine" */
  --brass-d: #a8861a;
  --oxblood: #7A2E2E;      /* secondary accent / CTA hover */
  --sage: #9FB8A3;         /* subtle rules, success */
  --slate: #5B6B7B;        /* muted / meta */
  --card: #FBF8F1;         /* soft page white */
  --border: #ddd2bd;
  --good: #3f7a55;
  --warn: #b07d1c;
  --bad: #8a3b3b;
  --maxw: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--parch); color: var(--ink);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.62; -webkit-font-smoothing: antialiased; }
a { color: var(--oxblood); text-decoration: none; font-weight: 600; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { font-family: "Fraunces", Georgia, serif; line-height: 1.14; color: var(--ink); font-weight: 600; letter-spacing: -.01em; }
strong { color: var(--ink); }
code { background: var(--parch-d); padding: .1rem .35rem; border-radius: 4px; font-family: "JetBrains Mono", monospace; font-size: .86em; }
.small { font-size: .85rem; }
.muted { color: var(--slate); }
.good { color: var(--good); } .warn { color: var(--warn); } .bad { color: var(--bad); }
.mono { font-family: "JetBrains Mono", monospace; }

/* ---- Nav ---- */
.nav { position: sticky; top: 0; z-index: 30; background: rgba(251,248,241,.94); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.nav-inner { max-width: var(--maxw); margin: 0 auto; padding: .7rem 1.2rem; display: flex; align-items: center; gap: .3rem 1.2rem; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: .55rem; font-family: "Fraunces", serif; font-weight: 700; font-size: 1.3rem; color: var(--ink); margin-right: auto; }
.brand .mark { width: 30px; height: 30px; flex: none; }
.nav a { color: var(--slate); font-size: .92rem; font-weight: 500; }
.nav a[aria-current="page"] { color: var(--oxblood); }
.nav .cta { background: var(--ink); color: var(--parch); padding: .42rem .9rem; border-radius: 7px; }
.nav .cta:hover { background: var(--oxblood); text-decoration: none; }

/* ---- Spine: the recurring left-rail motif ---- */
.spine { border-left: 4px solid var(--brass); padding-left: 1.1rem; }

/* ---- Layout ---- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.2rem; }
.wrap-app { max-width: 1320px; margin: 0 auto; padding: 1rem 1rem 4rem; }
section { padding: 3.2rem 0; }
.hero { padding: 4rem 0 2.6rem; }
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); margin: 0 0 1rem; }
.hero p.lede { font-size: 1.2rem; color: var(--ink-l); max-width: 40rem; }
.kicker { font-family: "JetBrains Mono", monospace; text-transform: uppercase; letter-spacing: .14em; font-size: .74rem; color: var(--brass-d); font-weight: 600; }
.row { display: flex; align-items: center; gap: .6rem; }
.grid { display: grid; gap: 1.2rem; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 820px) { .g2, .g3 { grid-template-columns: 1fr; } }

/* ---- Buttons ---- */
.btn { display: inline-flex; align-items: center; gap: .4rem; border: 1px solid var(--border); background: var(--card); color: var(--ink);
  padding: .55rem 1rem; border-radius: 8px; font: inherit; font-weight: 600; cursor: pointer; transition: .15s; }
.btn:hover { border-color: var(--brass); text-decoration: none; }
.btn.primary { background: var(--ink); color: var(--parch); border-color: var(--ink); }
.btn.primary:hover { background: var(--oxblood); border-color: var(--oxblood); }
.btn.ghost { background: transparent; }
.btn.sm { padding: .32rem .65rem; font-size: .85rem; border-radius: 6px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---- Cards ---- */
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 1.3rem; }
.card h3 { margin: 0 0 .5rem; }
.feature { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 1.2rem; border-top: 3px solid var(--brass); }

/* ---- Ledger-line divider ---- */
.rule { border: 0; border-top: 1px solid var(--border); margin: 2.4rem 0; }
.rule.brass { border-top: 2px solid var(--brass); opacity: .5; }

/* ---- Callout ---- */
.callout { background: var(--parch-d); border: 1px solid var(--border); border-left: 4px solid var(--brass); border-radius: 8px; padding: .9rem 1.1rem; margin: 1rem 0; }
.callout.warn { border-left-color: var(--oxblood); }
.callout p { margin: .3rem 0; }

/* ---- Badges ---- */
.badge { display: inline-block; font-size: .72rem; font-weight: 700; padding: .12rem .5rem; border-radius: 999px; background: var(--parch-d); color: var(--slate); border: 1px solid var(--border); font-family: "JetBrains Mono", monospace; }
.badge.brass { background: var(--brass); color: var(--ink); border-color: var(--brass-d); }
.badge.good { background: #e3efe6; color: var(--good); border-color: var(--sage); }
.badge.ox { background: #f0e3e3; color: var(--oxblood); border-color: #d9bcbc; }

/* ---- Tables ---- */
table { border-collapse: collapse; width: 100%; font-size: .92rem; }
th, td { text-align: left; padding: .55rem .7rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-family: "Fraunces", serif; font-weight: 600; }
tbody tr:hover { background: var(--parch-d); }

/* ---- Pricing ---- */
.tiers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
@media (max-width: 980px) { .tiers { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .tiers { grid-template-columns: 1fr; } }
.tier { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 1.3rem; display: flex; flex-direction: column; }
.tier.featured { border-color: var(--brass); border-width: 2px; box-shadow: 0 8px 30px rgba(201,162,39,.15); }
.tier .price { font-family: "Fraunces", serif; font-size: 1.9rem; color: var(--ink); margin: .3rem 0; }
.tier ul { list-style: none; padding: 0; margin: .8rem 0; font-size: .9rem; }
.tier li { padding: .3rem 0; border-bottom: 1px dotted var(--border); }

/* ---- Footer ---- */
.footer { background: var(--ink); color: var(--parch-d); padding: 2.6rem 0; margin-top: 2rem; font-size: .9rem; }
.footer a { color: var(--brass); }
.footer h4 { color: var(--parch); margin: 0 0 .6rem; font-size: .95rem; }

/* ============================================================
   APP SHELL — the three-pane bound-book reader/editor
   ============================================================ */
.app-top { display: flex; align-items: center; gap: .6rem 1rem; flex-wrap: wrap; padding: .6rem 0 1rem; border-bottom: 2px solid var(--brass); opacity: 1; margin-bottom: 1rem; }
.app-top .picker { display: flex; align-items: center; gap: .4rem; }
.app-top select, .app-top input[type=search] { font: inherit; padding: .4rem .6rem; border: 1px solid var(--border); border-radius: 7px; background: var(--card); color: var(--ink); }
.app-top input[type=search] { min-width: 16rem; font-family: "JetBrains Mono", monospace; font-size: .88rem; }

.workbench { display: grid; grid-template-columns: 280px 1fr; gap: 1.1rem; align-items: start; }
@media (max-width: 900px) { .workbench { grid-template-columns: 1fr; } }

/* Left rail = the spine: doc tree + search results */
.rail { background: var(--card); border: 1px solid var(--border); border-left: 4px solid var(--brass); border-radius: 10px; padding: .8rem; position: sticky; top: 70px; max-height: calc(100vh - 90px); overflow: auto; }
.rail h3 { font-size: .8rem; text-transform: uppercase; letter-spacing: .1em; color: var(--slate); font-family: "JetBrains Mono", monospace; margin: .2rem 0 .6rem; }
.tree { list-style: none; margin: 0; padding: 0; font-size: .9rem; }
.tree .folder { font-weight: 700; color: var(--ink); margin: .5rem 0 .2rem; font-family: "Fraunces", serif; display:flex; align-items:center; gap:.3rem; }
.tree .doc { padding: .25rem .4rem; border-radius: 6px; cursor: pointer; color: var(--ink-l); display: flex; justify-content: space-between; gap: .4rem; }
.tree .doc:hover { background: var(--parch-d); }
.tree .doc.active { background: var(--brass); color: var(--ink); font-weight: 600; }
.tree .doc .tag { font-size: .68rem; color: var(--brass-d); font-family: "JetBrains Mono", monospace; }
.tree .doc.active .tag { color: var(--ink-d); }
.searchres .hit { padding: .4rem; border-bottom: 1px dotted var(--border); cursor: pointer; }
.searchres .hit:hover { background: var(--parch-d); }
.searchres mark { background: var(--brass); color: var(--ink); padding: 0 1px; }
.searchres .where { font-size: .72rem; color: var(--slate); font-family: "JetBrains Mono", monospace; }

/* Main pane */
.pane { background: var(--card); border: 1px solid var(--border); border-radius: 10px; min-height: 60vh; overflow: hidden; }
.pane-head { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; padding: .7rem 1rem; border-bottom: 1px solid var(--border); background: var(--parch); }
.pane-head .title-in { flex: 1; min-width: 12rem; font: inherit; font-family: "Fraunces", serif; font-size: 1.15rem; font-weight: 600; border: 0; background: transparent; color: var(--ink); }
.pane-head .title-in:focus { outline: 1px dashed var(--brass); border-radius: 4px; }
.tabs { display: flex; gap: .2rem; }
.tabs button { background: transparent; border: 1px solid transparent; color: var(--slate); padding: .3rem .7rem; border-radius: 7px; cursor: pointer; font: inherit; font-size: .85rem; font-weight: 600; }
.tabs button.active { background: var(--ink); color: var(--parch); }

/* page-turn motif on view switch */
.turn { animation: turn .28s ease; transform-origin: left center; }
@keyframes turn { from { opacity: .2; transform: rotateY(-7deg); } to { opacity: 1; transform: none; } }

.split { display: grid; grid-template-columns: 1fr 1fr; }
@media (max-width: 760px) { .split { grid-template-columns: 1fr; } }
.editor-ta { width: 100%; min-height: 56vh; border: 0; border-right: 1px solid var(--border); padding: 1rem; font-family: "JetBrains Mono", monospace; font-size: .9rem; line-height: 1.6; resize: vertical; background: var(--card); color: var(--ink); }
.editor-ta:focus { outline: none; }
.preview { padding: 1rem 1.4rem; overflow: auto; max-height: 70vh; }
.preview h1 { font-size: 1.7rem; margin: .2rem 0 .8rem; border-bottom: 1px solid var(--border); padding-bottom: .3rem; }
.preview h2 { font-size: 1.3rem; margin: 1.4rem 0 .5rem; }
.preview h3 { font-size: 1.08rem; margin: 1.1rem 0 .4rem; }
.preview p { margin: .6rem 0; }
.preview ul, .preview ol { margin: .5rem 0 .5rem 1.2rem; }
.preview pre { background: var(--ink); color: var(--parch); padding: .9rem 1rem; border-radius: 8px; overflow: auto; }
.preview pre code { background: transparent; color: inherit; padding: 0; }
.preview blockquote { border-left: 4px solid var(--brass); margin: .6rem 0; padding: .2rem 1rem; color: var(--ink-l); background: var(--parch); }
.preview table { margin: .8rem 0; }
.preview a.wikilink { color: var(--oxblood); border-bottom: 1px dotted var(--oxblood); }
.preview a.wikilink.missing { color: var(--bad); border-bottom-style: dashed; }
.preview hr { border: 0; border-top: 1px solid var(--border); margin: 1.2rem 0; }
.fm-table { font-size: .85rem; margin: 0 0 1rem; }
.fm-table th { width: 9rem; color: var(--slate); font-family: "JetBrains Mono", monospace; font-weight: 600; font-size: .8rem; }

/* meta strip: tags, backlinks, history */
.metabar { padding: .6rem 1rem; border-top: 1px solid var(--border); background: var(--parch); font-size: .85rem; display: flex; gap: .5rem 1.2rem; flex-wrap: wrap; }
.metabar .chip { background: var(--parch-d); border: 1px solid var(--border); border-radius: 999px; padding: .1rem .55rem; font-size: .76rem; cursor: pointer; }
.metabar .chip:hover { border-color: var(--brass); }
.govbar { display: flex; align-items: center; gap: .5rem 1rem; flex-wrap: wrap; padding: .5rem 1rem; border-bottom: 1px solid var(--border); background: var(--parch-d); font-size: .85rem; }

/* history / diff */
.histlist { list-style: none; padding: 0; margin: 0; }
.histlist li { padding: .5rem .7rem; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; gap: .6rem; align-items: center; }
.histlist .when { font-family: "JetBrains Mono", monospace; font-size: .8rem; color: var(--slate); }
.diff { font-family: "JetBrains Mono", monospace; font-size: .84rem; white-space: pre-wrap; padding: 1rem; line-height: 1.5; }
.diff .add { background: #e3efe6; color: var(--good); display: block; }
.diff .del { background: #f3e1e1; color: var(--bad); display: block; text-decoration: line-through; }
.diff .ctx { color: var(--slate); display: block; }

/* toast */
.toast { position: fixed; bottom: 1.2rem; left: 50%; transform: translateX(-50%); background: var(--ink); color: var(--parch); padding: .7rem 1.2rem; border-radius: 9px; box-shadow: 0 8px 30px rgba(0,0,0,.25); z-index: 100; font-size: .9rem; border-left: 3px solid var(--brass); }

/* AI / cloud panels reuse .card; small helpers */
.field { display: block; margin: .6rem 0; }
.field label { display: block; font-size: .82rem; font-weight: 600; color: var(--slate); margin-bottom: .25rem; }
.field input, .field select, .field textarea { width: 100%; font: inherit; padding: .5rem .6rem; border: 1px solid var(--border); border-radius: 7px; background: var(--card); color: var(--ink); }
.field textarea { font-family: "JetBrains Mono", monospace; font-size: .88rem; min-height: 6rem; }
.integr { display: flex; gap: .8rem; align-items: flex-start; background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 1rem; margin: .7rem 0; }
.stat { font-family: "Fraunces", serif; font-size: 1.5rem; color: var(--ink); }
.empty { text-align: center; padding: 3rem 1rem; color: var(--slate); }
.hidden { display: none !important; }