/* Paper-guide extensions on top of curriculum.css */
.paper-index { max-width: 1040px; margin: 0 auto; padding: 48px 34px 90px; }
.paper-card {
  display: block;
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 26px 28px;
  margin-bottom: 16px;
  background: var(--paper);
  color: inherit;
  text-decoration: none;
}
.paper-card.tone-a { border-left: 5px solid #2d6a45; }
.paper-card.tone-b { border-left: 5px solid #2a6f97; }
.paper-card.tone-c { border-left: 5px solid #b57a12; }
.paper-card.tone-d { border-left: 5px solid #6b4ea0; }
.paper-card:hover { border-color: var(--accent); }
.paper-card h3 { margin: 0 0 8px; font: 500 24px/1.2 var(--serif); color: var(--ink); }
.paper-card .paper-meta { color: var(--faint); font: 500 11px var(--mono); letter-spacing: .04em; margin-bottom: 12px; text-transform: uppercase; }
.paper-card p { margin: 0; color: #3e443f; font: 400 17px/1.55 var(--serif); }

.knowledge-graph {
  background: var(--paper-alt);
  border: 1px solid var(--line);
  padding: 18px 20px;
  margin: 8px 0 28px;
  font: 400 12.5px/1.55 var(--mono);
  white-space: pre;
  overflow-x: auto;
  color: #26342c;
}
.prereq-list { margin: 0 0 32px; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.prereq-list li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.prereq-list b { color: var(--faint); font: 500 9px var(--mono); }
.prereq-list h4 { margin: 0 0 4px; font: 600 17px/1.3 var(--serif); color: var(--ink); }
.prereq-list p { margin: 0; color: var(--muted); font: 400 15px/1.55 var(--serif); }
.guide-back { display: inline-block; margin: 18px 0 0; color: var(--accent); font: 500 11px var(--mono); text-decoration: none; }
.guide-back:hover { text-decoration: underline; }
.article-table code { font-size: 10px; }

.editorial .video-frame { filter: none; background: #1d221e; }
.video-embed { margin: 28px 0 36px; }
.video-embed .article-caption { margin-top: 10px; }

.figure-block {
  margin: 8px 0 36px;
  padding: 18px 18px 14px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #f7f4ec 0%, #fbfbf8 70%);
}
.figure-block > .article-caption { margin: 12px 0 0; }

.arch {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.arch-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: stretch;
  justify-content: center;
}
.arch-box {
  flex: 1 1 140px;
  min-width: 120px;
  padding: 12px 14px;
  border-radius: 2px;
  color: #1b1f1c;
  font: 600 12px/1.35 var(--sans);
}
.arch-box small {
  display: block;
  margin-top: 5px;
  font: 400 11px/1.4 var(--serif);
  opacity: .85;
}
.arch-box.tone-leaf { background: #cfe8d4; border-left: 4px solid #2d6a45; }
.arch-box.tone-gold { background: #f3ddb0; border-left: 4px solid #b57a12; }
.arch-box.tone-sky { background: #c9dff0; border-left: 4px solid #2a6f97; }
.arch-box.tone-rose { background: #f1cfc4; border-left: 4px solid #a24c38; }
.arch-box.tone-lilac { background: #ddd4ee; border-left: 4px solid #6b4ea0; }
.arch-box.tone-ink { background: #243028; color: #f4f1ea; border-left: 4px solid #7dcea0; }
.arch-box.tone-ink small { color: #d5ddd6; }
.arch-down {
  text-align: center;
  color: var(--accent);
  font: 500 18px/1 var(--mono);
}

.kg-visual {
  display: grid;
  gap: 8px;
  margin: 8px 0 28px;
}
.kg-visual .kg-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.kg-node {
  padding: 8px 12px;
  border-radius: 999px;
  font: 600 11px/1.3 var(--sans);
  color: #1b1f1c;
}
.kg-node.leaf { background: #cfe8d4; }
.kg-node.gold { background: #f3ddb0; }
.kg-node.sky { background: #c9dff0; }
.kg-node.rose { background: #f1cfc4; }
.kg-node.lilac { background: #ddd4ee; }
.kg-node.ink { background: #243028; color: #f4f1ea; }
.kg-arrow { color: var(--accent); font: 500 14px var(--mono); }

.bars { margin: 8px 0 8px; }
.bar-row { display: grid; grid-template-columns: 140px 1fr 52px; gap: 10px; align-items: center; margin: 9px 0; }
.bar-row span { font: 500 11px var(--sans); color: var(--muted); }
.bar-row b { font: 600 11px var(--mono); color: var(--ink); text-align: right; }
.bar-track { height: 14px; background: #eceae2; overflow: hidden; }
.bar-fill { height: 100%; }
.bar-fill.leaf { background: #2d6a45; }
.bar-fill.gold { background: #b57a12; }
.bar-fill.sky { background: #2a6f97; }
.bar-fill.rose { background: #a24c38; }
.bar-fill.lilac { background: #6b4ea0; }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 24px; }
.chip {
  padding: 6px 10px;
  background: var(--paper-alt);
  border: 1px solid var(--line);
  color: var(--ink);
  font: 600 10px var(--mono);
  letter-spacing: .04em;
  text-transform: uppercase;
}

.timeline {
  display: grid;
  gap: 0;
  margin: 8px 0 28px;
  border-left: 3px solid #2d6a45;
}
.timeline div {
  padding: 10px 0 10px 16px;
  border-bottom: 1px dashed var(--line);
}
.timeline b { display: block; color: #2d6a45; font: 600 11px var(--mono); }
.timeline span { color: #3e443f; font: 400 15px/1.5 var(--serif); }

.case-study { margin: 8px 0 40px; }
.case-study > p.case-lede {
  margin: 0 0 18px;
  color: #3e443f;
  font: 400 18px/1.6 var(--serif);
}
.case-step {
  display: grid;
  grid-template-columns: 36px 1fr 1fr;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  align-items: start;
}
.case-step:last-child { border-bottom: 1px solid var(--line); }
.case-step .n {
  color: var(--accent);
  font: 600 13px var(--mono);
  padding-top: 2px;
}
.case-step h4 {
  margin: 0 0 6px;
  font: 600 11px var(--mono);
  letter-spacing: .06em;
  text-transform: uppercase;
}
.case-step .human h4 { color: #2a6f97; }
.case-step .model h4 { color: #2d6a45; }
.case-step p {
  margin: 0;
  color: #343a35;
  font: 400 16px/1.55 var(--serif);
}
.case-punch {
  margin: 18px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  background: var(--paper-alt);
  font: 400 17px/1.55 var(--serif);
}

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 8px 0 8px;
}
.compare .pane {
  padding: 14px 16px 12px;
  border: 1px solid var(--line);
  background: #fff;
}
.compare .pane.bad { border-top: 5px solid #a24c38; }
.compare .pane.good { border-top: 5px solid #2d6a45; }
.compare .pane h4 {
  margin: 0 0 8px;
  font: 600 12px var(--sans);
  letter-spacing: .04em;
  text-transform: uppercase;
}
.compare .pane p, .compare .pane li {
  margin: 0;
  color: #3e443f;
  font: 400 14px/1.5 var(--serif);
}
.compare .pane ol, .compare .pane ul { margin: 0; padding-left: 18px; }

.graph-stack { display: flex; flex-direction: column; gap: 6px; align-items: center; }
.graph-level { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; width: 100%; }
.graph-level .kg-node { text-align: center; }
.graph-v { color: var(--accent); font: 600 16px/1 var(--mono); }

.path-svg { width: 100%; height: auto; display: block; }
.path-svg text { font: 600 12px var(--sans); fill: #1b1f1c; }
.path-svg .muted { fill: #606660; font-weight: 500; }

.drift {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 6px;
  align-items: end;
  min-height: 88px;
  margin: 8px 0 4px;
}
.drift i {
  display: block;
  background: #2d6a45;
  border-radius: 2px 2px 0 0;
}
.drift.bad i { background: #a24c38; }

.size-row { display: flex; align-items: end; gap: 10px; height: 110px; margin: 6px 0 8px; }
.size-col { display: flex; flex-direction: column; align-items: center; justify-content: end; gap: 6px; flex: 1; }
.size-col .blk { width: 100%; max-width: 72px; border-radius: 2px 2px 0 0; }
.size-col span { font: 600 10px var(--sans); color: var(--muted); text-align: center; }

.token-row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin: 6px 0; }
.token {
  padding: 10px 12px;
  min-width: 72px;
  text-align: center;
  font: 600 11px/1.3 var(--sans);
  border-radius: 4px;
}
.token b { display: block; font: 700 18px/1.2 var(--mono); }
.token.n-leaf { background: #cfe8d4; }
.token.n-gold { background: #f3ddb0; }
.token.n-sky { background: #c9dff0; }
.token.n-rose { background: #f1cfc4; }
.token.n-lilac { background: #ddd4ee; }
.token.n-ink { background: #243028; color: #f4f1ea; }

.layers { display: flex; flex-direction: column-reverse; gap: 4px; max-width: 280px; margin: 8px auto; }
.layers i {
  display: block;
  height: 18px;
  border-radius: 2px;
  background: #cfe8d4;
  border: 1px solid #2d6a45;
}
.layers i.off { background: #f1cfc4; border-color: #a24c38; opacity: .45; position: relative; }
.layers i.off::after { content: "skip"; position: absolute; right: 8px; font: 600 9px var(--mono); color: #a24c38; top: 3px; }

.queue {
  display: flex;
  gap: 4px;
  align-items: stretch;
  margin: 8px 0;
}
.queue i {
  flex: 1;
  min-height: 36px;
  background: #cfe8d4;
  border-radius: 2px;
}
.queue i.used { background: #eceae2; }
.queue i.fire { background: #f3ddb0; outline: 2px solid #b57a12; }

.strip { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; justify-content: center; margin: 8px 0; }
.strip .op { color: var(--accent); font: 600 14px var(--mono); }

.paper-fig { margin: 8px 0 28px; padding: 12px; border: 1px solid var(--line); background: #fff; }
.paper-fig img { width: 100%; height: auto; display: block; background: #f7f4ec; }
.paper-fig .article-caption { margin-top: 10px; }

.spoke-map {
  display: grid;
  grid-template-columns: 1fr minmax(140px, 22%) 1fr;
  gap: 12px 16px;
  align-items: center;
  margin: 8px 0 10px;
}
.spoke-col { display: flex; flex-direction: column; gap: 8px; }
.spoke-col.left { align-items: flex-end; }
.spoke-col.right { align-items: flex-start; }
.spoke-core {
  justify-self: center;
  text-align: center;
  padding: 22px 16px;
  background: #243028;
  color: #f4f1ea;
  font: 700 14px/1.3 var(--sans);
  border-radius: 8px;
  box-shadow: 0 0 0 6px #cfe8d4, 0 0 0 12px #f3ddb0;
}
.spoke-core small { display: block; margin-top: 6px; font: 400 11px/1.35 var(--serif); color: #d5ddd6; }
.spoke-col a.kg-node, .spoke-col .kg-node { text-decoration: none; max-width: 220px; }
.spoke-col a.kg-node:hover { outline: 2px solid var(--accent); }
.kg-legend {
  display: flex; flex-wrap: wrap; gap: 10px 16px; justify-content: center;
  margin: 12px 0 0; font: 500 11px var(--sans); color: var(--muted);
}
.kg-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 99px; margin-right: 4px; vertical-align: -1px; }

.read-next { margin: 12px 0 32px; padding: 0; list-style: none; }
.read-next li {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.read-next b { font: 600 10px var(--mono); color: var(--accent); }
.read-next h4 { margin: 0 0 4px; font: 600 16px/1.3 var(--serif); }
.read-next h4 a { color: inherit; text-decoration: none; }
.read-next h4 a:hover { color: var(--accent); }
.read-next p { margin: 0; color: #3e443f; font: 400 15px/1.5 var(--serif); }

@media (max-width: 720px) {
  .paper-index { padding: 32px 22px 70px; }
  .bar-row { grid-template-columns: 1fr; }
  .case-step { grid-template-columns: 28px 1fr; }
  .case-step .model { grid-column: 2; }
  .compare { grid-template-columns: 1fr; }
  .spoke-map { grid-template-columns: 1fr; }
  .spoke-col.left, .spoke-col.right { align-items: stretch; }
}