/* Marrow — warm archival library */
:root {
  --paper: #f4ecdd;
  --paper-raised: #fbf6ec;
  --paper-sunk: #ece2cf;
  --ink: #211c16;
  --ink-soft: #61574b;
  --ink-faint: #8d8272;
  --line: rgba(33, 28, 22, 0.14);
  --line-strong: rgba(33, 28, 22, 0.28);
  --oxblood: #7b2e28;
  --brass: #96751f;
  --sage: #47614d;
  --shadow: 0 1px 2px rgba(33, 28, 22, 0.06), 0 8px 24px -16px rgba(33, 28, 22, 0.22);
  --radius: 4px;
  --font-display: 'Boska', Georgia, serif;
  --font-body: 'Source Serif 4', Georgia, serif;
  --font-ui: 'Work Sans', system-ui, sans-serif;
}
[data-theme='lamp'] {
  --paper: #14110d;
  --paper-raised: #1d1914;
  --paper-sunk: #100e0a;
  --ink: #f0e8d9;
  --ink-soft: #ab9e8a;
  --ink-faint: #837863;
  --line: rgba(240, 232, 217, 0.15);
  --line-strong: rgba(240, 232, 217, 0.3);
  --oxblood: #cd6f63;
  --brass: #d5aa41;
  --sage: #86a88b;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px -18px rgba(0, 0, 0, 0.8);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background-image: radial-gradient(rgba(33, 28, 22, 0.035) 1px, transparent 0);
  background-size: 4px 4px;
}
[data-theme='lamp'] body { background-image: radial-gradient(rgba(240, 232, 217, 0.03) 1px, transparent 0); }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.2; margin: 0; letter-spacing: -0.01em; }
h1 { font-size: 24px; }
h2 { font-size: 20px; }
h3 { font-size: 17px; }
p { margin: 0 0 0.9em; }
a { color: inherit; }
button, input, textarea, select { font: inherit; color: inherit; }
::selection { background: var(--brass); color: var(--paper-raised); }

/* ---------- chrome ---------- */
.shell { display: grid; grid-template-columns: 236px minmax(0, 1fr); min-height: 100vh; }
.sidebar {
  border-right: 1px solid var(--line);
  padding: 22px 18px 28px;
  display: flex; flex-direction: column; gap: 26px;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  background: linear-gradient(180deg, var(--paper-raised), var(--paper) 60%);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand svg { color: var(--oxblood); flex: none; }
.brand b { font-family: var(--font-display); font-size: 21px; font-weight: 700; letter-spacing: 0.02em; }
.brand span { display: block; font-family: var(--font-ui); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); }
nav { display: flex; flex-direction: column; gap: 1px; }
nav a {
  font-family: var(--font-ui); font-size: 14px; text-decoration: none; color: var(--ink-soft);
  padding: 7px 10px; border-radius: var(--radius); display: flex; align-items: center; gap: 9px;
  transition: background 140ms ease, color 140ms ease;
}
nav a:hover { background: var(--paper-sunk); color: var(--ink); }
nav a.on { background: var(--ink); color: var(--paper-raised); }
nav a .pill { margin-left: auto; font-size: 11px; color: inherit; opacity: 0.65; font-variant-numeric: tabular-nums; }
.side-foot { margin-top: auto; display: flex; flex-direction: column; gap: 10px; font-family: var(--font-ui); font-size: 12px; color: var(--ink-faint); }
.side-note { border-top: 1px solid var(--line); padding-top: 12px; line-height: 1.5; }
main { padding: 40px 46px 96px; max-width: 1180px; }

/* ---------- primitives ---------- */
.eyebrow { font-family: var(--font-ui); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); }
.lede { color: var(--ink-soft); max-width: 62ch; }
.card {
  background: var(--paper-raised); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
}
.card.flat { box-shadow: none; }
.grid { display: grid; gap: 16px; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.between { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.stack { display: flex; flex-direction: column; gap: 8px; }
.rule { height: 1px; background: var(--line); border: 0; margin: 28px 0; }
.mono { font-family: var(--font-ui); font-variant-numeric: tabular-nums; }
.muted { color: var(--ink-soft); }
.faint { color: var(--ink-faint); }
.small { font-family: var(--font-ui); font-size: 13px; }
.tiny { font-family: var(--font-ui); font-size: 11.5px; }
.serif-body { font-size: 17px; line-height: 1.68; }

button.btn {
  font-family: var(--font-ui); font-size: 13.5px; font-weight: 500; cursor: pointer;
  background: var(--ink); color: var(--paper-raised); border: 1px solid var(--ink);
  padding: 9px 16px; border-radius: var(--radius);
  transition: transform 120ms ease, opacity 120ms ease, background 140ms ease;
}
button.btn:hover { opacity: 0.9; }
button.btn:active { transform: translateY(1px); }
button.btn[disabled] { opacity: 0.35; cursor: not-allowed; }
button.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
button.btn.ghost:hover { background: var(--paper-sunk); }
button.btn.blood { background: var(--oxblood); border-color: var(--oxblood); color: #fdf6ec; }
button.btn.sm { padding: 6px 11px; font-size: 12.5px; }
button.linky { background: none; border: 0; padding: 0; cursor: pointer; font-family: var(--font-ui); font-size: 13px; color: var(--oxblood); text-decoration: underline; text-underline-offset: 3px; }

input[type='text'], textarea, select {
  width: 100%; background: var(--paper); border: 1px solid var(--line-strong);
  border-radius: var(--radius); padding: 10px 12px; font-family: var(--font-body); font-size: 15.5px;
  transition: border-color 140ms ease, box-shadow 140ms ease;
}
textarea { resize: vertical; min-height: 84px; line-height: 1.55; }
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--brass); box-shadow: 0 0 0 3px rgba(150, 117, 31, 0.14); }
label.field { display: block; }
label.field .lab { font-family: var(--font-ui); font-size: 12px; letter-spacing: 0.02em; color: var(--ink-soft); display: block; margin-bottom: 5px; }

.chip {
  font-family: var(--font-ui); font-size: 11.5px; padding: 3px 9px; border-radius: 999px;
  border: 1px solid var(--line-strong); color: var(--ink-soft); background: transparent;
  display: inline-flex; align-items: center; gap: 5px; white-space: nowrap;
}
.chip.on { background: var(--ink); color: var(--paper-raised); border-color: var(--ink); }
.chip.brass { border-color: var(--brass); color: var(--brass); }
.chip.blood { border-color: var(--oxblood); color: var(--oxblood); }
.chip.sage { border-color: var(--sage); color: var(--sage); }
button.chip { cursor: pointer; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }

.bar { height: 5px; background: var(--paper-sunk); border-radius: 999px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--brass); border-radius: 999px; transition: width 400ms cubic-bezier(0.22, 1, 0.36, 1); }
.bar.sage > i { background: var(--sage); }

.stat-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-raised); overflow: hidden; }
.stat { padding: 14px 16px; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat b { font-family: var(--font-display); font-size: 23px; display: block; line-height: 1.1; }
.stat span { font-family: var(--font-ui); font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-faint); }

.empty { border: 1px dashed var(--line-strong); border-radius: var(--radius); padding: 26px; text-align: center; color: var(--ink-soft); }
.skeleton { background: linear-gradient(90deg, var(--paper-sunk), var(--paper-raised), var(--paper-sunk)); background-size: 200% 100%; animation: sh 1.4s infinite; border-radius: var(--radius); }
@keyframes sh { to { background-position: -200% 0; } }
.fade-in { animation: fi 320ms cubic-bezier(0.22, 1, 0.36, 1) both; }
@keyframes fi { from { opacity: 0; transform: translateY(6px); } }

/* ---------- onboarding ---------- */
.onboard { display: grid; grid-template-columns: 1.05fr 1fr; min-height: 100vh; }
.onboard .art { position: relative; background: var(--paper-sunk); overflow: hidden; }
.onboard .art img { width: 100%; height: 100%; object-fit: cover; display: block; }
.onboard .art figcaption { position: absolute; bottom: 0; left: 0; right: 0; padding: 28px 32px; background: linear-gradient(transparent, rgba(12, 9, 6, 0.82)); color: #f6ece0; font-family: var(--font-body); font-size: 15px; }
.onboard .form { padding: 56px 52px; display: flex; flex-direction: column; gap: 22px; justify-content: center; max-width: 620px; }
.big-quote { font-family: var(--font-display); font-size: 26px; line-height: 1.25; }

/* ---------- depth cards ---------- */
.depths { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.depth {
  text-align: left; cursor: pointer; background: var(--paper-raised); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px; transition: border-color 140ms ease, transform 140ms ease, background 140ms ease;
}
.depth:hover { border-color: var(--line-strong); transform: translateY(-1px); }
.depth.on { border-color: var(--oxblood); background: var(--paper-raised); box-shadow: inset 3px 0 0 var(--oxblood); }
.depth b { font-family: var(--font-display); font-size: 18px; display: block; }
.depth em { font-family: var(--font-ui); font-style: normal; font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-faint); }
.depth p { font-size: 14px; color: var(--ink-soft); margin: 8px 0 0; }

/* ---------- book & concept ---------- */
.book-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.book-card { display: flex; flex-direction: column; gap: 10px; cursor: pointer; text-align: left; background: var(--paper-raised); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); transition: transform 150ms cubic-bezier(0.22, 1, 0.36, 1), border-color 150ms ease; }
.book-card:hover { transform: translateY(-2px); border-color: var(--line-strong); }
.book-card .spine-mark { width: 26px; height: 3px; background: var(--oxblood); border-radius: 2px; }
.book-card h3 { font-size: 18px; }

.concept-row { display: grid; grid-template-columns: 26px minmax(0, 1fr) auto; gap: 14px; align-items: start; padding: 14px 0; border-bottom: 1px solid var(--line); text-align: left; background: none; border-left: 0; border-right: 0; border-top: 0; width: 100%; cursor: pointer; }
.concept-row:hover .cname { text-decoration: underline; text-underline-offset: 3px; }
.concept-row .num { font-family: var(--font-ui); font-size: 12px; color: var(--ink-faint); padding-top: 3px; }
.cname { font-family: var(--font-display); font-size: 17px; }

.reader { display: grid; grid-template-columns: minmax(0, 1fr) 268px; gap: 34px; align-items: start; }
.reader-main { max-width: 68ch; }
.reader-rail { position: sticky; top: 34px; display: flex; flex-direction: column; gap: 14px; }
.master-block { border-left: 2px solid var(--line-strong); padding-left: 18px; margin: 0 0 22px; }
.master-block .eyebrow { margin-bottom: 6px; }
.gate { border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-raised); padding: 16px; }
.gate.done { border-color: var(--sage); }
.gate .prompt { font-family: var(--font-display); font-size: 16px; margin-bottom: 4px; }
.wordcount { font-family: var(--font-ui); font-size: 11.5px; color: var(--ink-faint); }
.echo { border-left: 2px solid var(--brass); padding: 4px 0 4px 12px; font-size: 14px; }
.echo b { font-family: var(--font-ui); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--brass); display: block; }

/* ---------- map ---------- */
.map-wrap { position: relative; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-raised); overflow: hidden; }
.map-wrap svg { display: block; width: 100%; height: auto; cursor: grab; }
.map-legend { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; margin-top: 10px; }
.map-legend div { display: flex; align-items: center; gap: 7px; font-family: var(--font-ui); font-size: 11.5px; color: var(--ink-soft); }
.map-legend .legend-hint { color: var(--ink-faint); font-style: italic; margin-left: auto; }
.map-legend i { width: 9px; height: 9px; border-radius: 50%; display: block; }
.node-label { font-family: var(--font-ui); font-size: 10.5px; fill: var(--ink-soft); pointer-events: none; }
.node-label.bk { font-size: 11px; fill: var(--ink); font-weight: 500; }
.inspect { position: absolute; right: 14px; top: 14px; width: 280px; max-height: 470px; overflow-y: auto; background: var(--paper-raised); border: 1px solid var(--line-strong); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }

.trap { border: 1px solid var(--line); border-left: 3px solid var(--oxblood); border-radius: var(--radius); background: var(--paper-raised); padding: 18px; }
.trap.warn { border-left-color: var(--brass); }
.counter { background: var(--paper-sunk); border-radius: var(--radius); padding: 10px 12px; font-size: 14.5px; }

.principle-row { display: grid; grid-template-columns: minmax(0, 1fr) 130px; gap: 18px; align-items: center; padding: 13px 0; border-bottom: 1px solid var(--line); }
.vault-entry { border-bottom: 1px solid var(--line); padding: 16px 0; }

.toast { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%); background: var(--ink); color: var(--paper-raised); font-family: var(--font-ui); font-size: 13.5px; padding: 10px 18px; border-radius: 999px; box-shadow: var(--shadow); z-index: 60; animation: fi 240ms ease both; }

@media (max-width: 1000px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; flex-direction: column; align-items: stretch; gap: 12px; overflow: visible; border-right: 0; border-bottom: 1px solid var(--line); padding: 14px 16px; }
  .sidebar nav { flex-direction: row; flex-wrap: wrap; gap: 6px; }
  .sidebar nav a { padding: 7px 11px; font-size: 13px; }
  .side-foot { margin-top: 0; flex-direction: row; align-items: center; justify-content: space-between; gap: 12px; }
  .side-note { border-top: 0; padding-top: 0; }
  main { padding: 24px 18px 80px; }
  .onboard { grid-template-columns: 1fr; }
  .onboard .art { height: 210px; }
  .onboard .form { padding: 28px 20px; }
  .reader { grid-template-columns: 1fr; }
  .reader-rail { position: static; }
  .depths { grid-template-columns: 1fr; }
  .inspect { position: static; width: auto; max-height: none; margin: 12px; }

}

.ring { flex: 0 0 auto; }
.ring-num { font-family: var(--font-ui); font-size: 11px; font-weight: 600; fill: var(--ink-soft); }
.one-line { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }

/* ---------- the index ---------- */
.idx-list { display: flex; flex-direction: column; border-top: 1px solid var(--line); }
.idx-row {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 18px;
  padding: 14px 2px; border-bottom: 1px solid var(--line);
}
.idx-row:hover { background: var(--paper-2); }
.idx-main { min-width: 0; }
.idx-title {
  font-family: var(--font-display); font-size: 17px; color: var(--ink);
  text-decoration: none; line-height: 1.3;
}
.idx-title:hover { color: var(--oxblood); text-decoration: underline; text-underline-offset: 3px; }
.idx-act { flex: none; padding-top: 2px; }
.chip.sm { font-size: 10px; padding: 2px 7px; }
.btn.sm { font-size: 12px; padding: 6px 12px; }
button.chip { cursor: pointer; font: inherit; font-size: 12px; }
button.chip.on { background: var(--ink); color: var(--paper); border-color: var(--ink); }
@media (max-width: 700px) {
  .idx-row { flex-direction: column; gap: 8px; }
  .idx-act { padding-top: 0; }
}
main { min-width: 0; }
.idx-main { flex: 1 1 auto; min-width: 0; }
.idx-row .one-line { white-space: normal; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
@media (max-width: 700px) {
  .between { flex-wrap: wrap; }
  #idx-q { max-width: 100% !important; width: 100%; }
}