/* Contenerización · Study-desk editorial v4 (misma piel que hub/papers; layout dock) */
:root {
  --bg: #131110;
  --bg2: #171514;
  --surface: #1b1917;
  --surface2: #221f1c;
  --surface3: #2a2622;
  --border: #322d27;
  --border-soft: #25211d;
  --text: #ece7dc;
  --muted: #a8a196;
  --dim: #6f6a61;
  --blue: #8ba3c7;
  --blue-soft: rgba(139, 163, 199, 0.12);
  --teal: #6fae9d;
  --orange: #c08d5c;
  --gold: #c2a05e;
  --good: #74b18f;
  --good-bg: rgba(116, 177, 143, 0.12);
  --warn: #c2a05e;
  --warn-bg: rgba(194, 160, 94, 0.12);
  --bad: #c07f8c;
  --bad-bg: rgba(192, 127, 140, 0.12);
  --info-bg: rgba(139, 163, 199, 0.1);
  --well: #0e0d0c;
  --well-ink: #d7d2c6;
  --display: Georgia, "Palatino Linotype", "Book Antiqua", Palatino, serif;
  --mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --measure: 88ch;
  --radius: 8px;
  --radius-sm: 6px;
  --ring: 0 0 0 2px rgba(139, 163, 199, 0.45);
  --rail-w: 260px;
}

body.light {
  --bg: #f4f1e9;
  --bg2: #ece6d5;
  --surface: #fbf9f2;
  --surface2: #f0e9d6;
  --surface3: #e3d8bf;
  --border: #d2c7a9;
  --border-soft: #e0d6bc;
  --text: #26241f;
  --muted: #5e594e;
  --dim: #948d7d;
  --blue: #3c5a86;
  --blue-soft: rgba(60, 90, 134, 0.09);
  --teal: #337065;
  --orange: #8f5f2b;
  --gold: #7d6a2e;
  --good: #3c7a5d;
  --good-bg: rgba(60, 122, 93, 0.12);
  --warn: #7d6a2e;
  --warn-bg: rgba(125, 106, 46, 0.12);
  --bad: #9c4a59;
  --bad-bg: rgba(156, 74, 89, 0.12);
  --info-bg: rgba(60, 90, 134, 0.08);
  --well: #1a1815;
  --well-ink: #e8e2d4;
  --ring: 0 0 0 2px rgba(60, 90, 134, 0.35);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; height: 100%; }
body {
  margin: 0;
  min-height: 100%;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--border); color: var(--text); }
:focus-visible { outline: none; box-shadow: var(--ring); }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.skip-link {
  position: absolute; left: 12px; top: -48px; z-index: 100;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 8px 14px; font-size: 14px; font-weight: 600;
  transition: top 0.15s ease;
}
.skip-link:focus { top: 12px; }

/* —— Dock layout —— */
.dock {
  display: grid;
  grid-template-columns: var(--rail-w) 1fr;
  min-height: 100vh;
}
.rail {
  background: var(--surface);
  color: var(--text);
  border-right: 1px solid var(--border-soft);
  padding: 22px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
}
.stamp {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 0 0 10px;
}
.stamp a {
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--border);
  background: var(--surface2);
  padding: 4px 8px;
  border-radius: 4px;
  letter-spacing: 0.04em;
  display: inline-block;
}
.stamp a:hover { color: var(--text); border-color: var(--dim); text-decoration: none; }
.stamp .sep { margin: 0 6px; color: var(--dim); }
.rail-title {
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.rail-sub { margin: 6px 0 0; color: var(--muted); font-size: 13px; }

.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  scrollbar-width: thin;
}
.rail-link {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 8px;
  align-items: baseline;
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 13.5px;
  font-weight: 550;
  padding: 8px 10px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
}
.rail-link:hover { color: var(--text); background: var(--surface2); }
.rail-link.active {
  color: var(--text);
  background: var(--surface3);
  border-left-color: var(--blue);
  box-shadow: inset 0 -1px 0 transparent;
}
.rail-link .n { font-family: var(--mono); font-size: 11.5px; color: var(--dim); font-weight: 700; }
.rail-link.active .n { color: var(--blue); }
.rail-link.done .n { color: var(--good); }

.rail-foot {
  border-top: 1px solid var(--border-soft);
  padding-top: 14px;
  flex-shrink: 0;
}
.rail-tools {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
}
.theme-btn {
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  min-width: 34px;
  height: 34px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 12px;
  font-weight: 650;
  font-family: var(--mono);
  flex: 0 0 auto;
}
.theme-btn:hover { border-color: var(--dim); }
.progress-label, .progress-meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 0;
}
.progress-track {
  height: 3px;
  background: var(--border-soft);
  margin: 8px 0;
  border-radius: 999px;
  overflow: hidden;
}
.progress-fill {
  display: block;
  height: 100%;
  width: 0;
  background: var(--blue);
  transition: width 0.35s ease;
}

/* —— Main deck —— */
.deck { min-width: 0; background: var(--bg); }
.deck-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 28px;
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 5;
}
.where {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
}
.view { padding: 28px 32px 88px; max-width: 1100px; }

h1 {
  font-family: var(--display);
  font-size: clamp(1.7rem, 3.2vw, 2.25rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
  font-weight: 700;
  color: var(--text);
}
h2 {
  font-family: var(--display);
  font-size: 1.3rem;
  margin: 36px 0 10px;
  letter-spacing: -0.015em;
  color: var(--text);
}
h3 {
  font-size: 1.05rem;
  margin: 22px 0 8px;
  font-weight: 650;
  color: var(--text);
}
p { max-width: var(--measure); color: var(--muted); margin: 0 0 12px; }
p strong, li strong { color: var(--text); }
ul, ol { color: var(--muted); max-width: var(--measure); padding-left: 1.2em; }
li { margin-bottom: 6px; }
.lede { font-size: 1.05rem; max-width: 62ch; color: var(--muted); }
.kicker {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 0 0 8px;
}

.sheet {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
  padding: 20px 22px 16px;
  margin: 18px 0;
}
.sheet h2:first-child,
.sheet h3:first-child { margin-top: 0; }

.callout {
  border: 1px solid var(--border-soft);
  background: var(--info-bg);
  padding: 12px 14px 12px 16px;
  margin: 14px 0;
  max-width: var(--measure);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  border-left: 3px solid var(--blue);
}
.callout.warn { background: var(--warn-bg); border-left-color: var(--warn); }
.callout.bad { background: var(--bad-bg); border-left-color: var(--bad); }
.callout.good { background: var(--good-bg); border-left-color: var(--good); }
.callout .lbl {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 6px;
  color: var(--text);
  font-weight: 700;
}

.trade {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 16px 0 20px;
  max-width: 760px;
}
.trade div { background: var(--surface); padding: 12px 14px; color: var(--muted); font-size: 14.5px; }
.trade b {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.trade .g b { color: var(--good); }
.trade .p b { color: var(--bad); }

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--surface2);
  border: 1px solid var(--border-soft);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--text);
}
pre, .editor, .ref-block {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  background: var(--well);
  color: var(--well-ink);
  padding: 14px 16px;
  overflow-x: auto;
  margin: 12px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 100%;
}
.editor {
  min-height: 280px;
  resize: vertical;
  color: var(--well-ink);
}
.editor:focus { box-shadow: var(--ring); outline: none; border-color: var(--blue); }

details {
  margin: 14px 0;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  background: var(--surface);
  padding: 10px 14px;
}
details summary {
  cursor: pointer;
  font-weight: 650;
  color: var(--text);
  font-size: 14px;
}
details[open] summary { margin-bottom: 8px; }

.btn, .ghost {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  cursor: pointer;
}
.btn {
  background: var(--blue);
  color: #0e1014;
  border: 1px solid var(--blue);
}
body.light .btn { color: #fff; }
.btn:hover { filter: brightness(1.06); }
.ghost {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
}
.ghost:hover { border-color: var(--dim); background: var(--surface2); }
.ghost.danger:hover { border-color: var(--bad); color: var(--bad); }
.row-actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 8px; }

.topic-list { list-style: none; padding: 0; margin: 24px 0 0; max-width: none; }
.topic-list li { margin: 0; border-top: 1px solid var(--border-soft); }
.topic-list li:last-child { border-bottom: 1px solid var(--border-soft); }
.topic-list button {
  width: 100%;
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr) auto;
  gap: 12px 14px;
  align-items: center;
  text-align: left;
  background: transparent;
  border: 0;
  padding: 14px 6px;
  font: inherit;
  cursor: pointer;
  color: inherit;
  border-radius: var(--radius-sm);
}
.topic-list button:hover { background: var(--surface); }
.topic-list .n { font-family: var(--mono); color: var(--dim); font-size: 13px; font-weight: 700; }
.topic-list .t { font-weight: 650; color: var(--text); grid-column: 2; }
.topic-list .s { color: var(--muted); font-size: 13.5px; grid-column: 2; grid-row: 2; }
.topic-list .pill { grid-column: 3; grid-row: 1 / span 2; align-self: center; }

.pill {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--good);
  border: 1px solid var(--good);
  background: var(--good-bg);
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}

.quiz { margin: 18px 0; max-width: 720px; }
.quiz-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.score-chip {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 650;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
}
.opt {
  position: relative;
  display: block;
  width: 100%;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 10px 13px 10px 48px;
  margin: 7px 0;
  font: inherit;
  font-size: 14px;
  line-height: 1.5;
  cursor: pointer;
}
.opt::before {
  content: attr(data-letter);
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background: var(--surface2);
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--dim);
}
.opt:hover { border-color: var(--dim); }
.opt:hover::before { color: var(--text); border-color: var(--dim); }
.opt.right { border-color: var(--good); }
.opt.right::before { background: var(--good); border-color: var(--good); color: #0e1512; }
.opt.wrong { border-color: var(--bad); }
.opt.wrong::before { background: var(--bad); border-color: var(--bad); color: #fff; }
.opt:disabled { cursor: default; opacity: 0.92; }
.explain {
  display: none;
  margin-top: 10px;
  background: var(--surface2);
  border: 1px solid var(--border-soft);
  border-left: 3px solid var(--teal);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 12px 14px;
  font-size: 14px;
  color: var(--muted);
}
.explain.show { display: block; }
.explain .why-label { font-weight: 700; color: var(--text); }

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0 8px;
}
.compare h3 {
  margin: 0 0 6px;
  font-size: 12px;
  font-family: var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
}
.line { white-space: pre-wrap; padding: 2px 6px; border-radius: 3px; }
.line.add { background: rgba(116, 177, 143, 0.2); color: var(--good); }
.line.miss { background: rgba(192, 127, 140, 0.2); color: var(--bad); }
.line.ok { background: transparent; color: var(--well-ink); }
.legend { font-size: 13px; color: var(--dim); margin: 8px 0 16px; }

.findings { list-style: none; padding: 0; max-width: none; }
.findings li {
  border-left: 3px solid var(--border);
  padding: 10px 12px;
  margin: 8px 0;
  background: var(--surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--muted);
  font-size: 14.5px;
}
.findings li.good { border-left-color: var(--good); background: var(--good-bg); }
.findings li.warn { border-left-color: var(--warn); background: var(--warn-bg); }
.findings li.bad { border-left-color: var(--bad); background: var(--bad-bg); }
.findings .tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 4px;
  color: var(--text);
  font-weight: 700;
}

.case {
  border-top: 1px solid var(--border-soft);
  padding: 16px 0;
}
.match-row {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 12px;
  align-items: center;
  margin: 8px 0;
  max-width: 720px;
}
select {
  font: inherit;
  padding: 7px 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: var(--radius-sm);
}

.note { font-size: 14px; color: var(--dim); max-width: var(--measure); }

.topic-layout {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
  margin: 8px 0 12px;
}
.topic-toc {
  position: sticky;
  top: 56px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 12px 14px;
  max-height: calc(100vh - 80px);
  overflow: auto;
}
.topic-toc-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 0 0 8px;
}
.topic-toc-list {
  margin: 0;
  padding-left: 1.1em;
  max-width: none;
  font-size: 13px;
}
.topic-toc-list a {
  color: var(--muted);
  text-decoration: none;
  display: inline-block;
  padding: 3px 0;
}
.topic-toc-list a:hover { color: var(--blue); text-decoration: underline; }

.glossary-search {
  width: 100%;
  max-width: 480px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font: inherit;
  font-size: 14.5px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  margin: 8px 0 14px;
}
.glossary-search:focus { border-color: var(--blue); box-shadow: var(--ring); outline: none; }
.gloss-term {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin: 10px 0;
  border-left: 2px solid transparent;
}
.gloss-term:hover { border-left-color: var(--blue); }
.gloss-term h3 { margin: 0 0 6px; font-size: 15.5px; font-family: var(--display); }
.gloss-term .def { margin: 0; color: var(--muted); font-size: 14px; }

.cheat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.cheat-card h3 { margin-top: 0; font-family: var(--display); }
.cheat-card ul { margin: 0; max-width: none; }

table.doc {
  border-collapse: collapse;
  width: 100%;
  max-width: 860px;
  margin: 14px 0 18px;
  font-size: 14px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  overflow: hidden;
}
table.doc th, table.doc td {
  border: 1px solid var(--border-soft);
  padding: 9px 12px;
  text-align: left;
  vertical-align: top;
  color: var(--muted);
}
table.doc th {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text);
  background: var(--surface2);
}
table.doc td strong { color: var(--text); }

@media (max-width: 860px) {
  .dock { grid-template-columns: 1fr; }
  .rail {
    height: auto;
    position: relative;
    border-right: 0;
    border-bottom: 1px solid var(--border-soft);
    max-height: none;
    overflow: visible;
  }
  .rail-nav {
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 4px;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
  }
  .rail-link {
    width: auto;
    flex: 0 0 auto;
    border-left: 0;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    grid-template-columns: auto auto;
  }
  .rail-link.active {
    border-left-color: transparent;
    border-bottom-color: var(--blue);
  }
  .view { padding: 20px 16px 64px; }
  .deck-bar { padding: 12px 16px; }
  .compare, .trade, .match-row { grid-template-columns: 1fr; }
  .topic-list button { grid-template-columns: 2.4rem 1fr; }
  .topic-list .s { display: none; }
  .topic-list .pill { grid-column: 2; grid-row: auto; justify-self: start; }
  .topic-layout { grid-template-columns: 1fr; }
  .topic-toc { position: static; max-height: none; }
  .cheat-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}
@media print {
  .rail, .deck-bar, .theme-btn, .row-actions, .topic-toc, .quiz, .rail-tools { display: none !important; }
  .dock { display: block; }
  .view { max-width: none; padding: 0; }
  .cheat-grid { grid-template-columns: 1fr 1fr; }
  body { background: #fff; color: #111; }
}