:root {
  --bg: #eef2f5;
  --panel: #ffffff;
  --ink: #18202a;
  --muted: #5d6c79;
  --line: #d7e0e8;
  --accent: #0d4f7c;
  --accent-soft: #e7f2f9;
  --warm: #fff8eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(13, 79, 124, 0.07), transparent 30%),
    linear-gradient(180deg, #f6f8fa 0%, #e8eef3 100%);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.shell {
  max-width: 1480px;
  margin: 0 auto;
  padding: 32px 18px 56px;
}

.panel {
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 16px 36px rgba(24, 32, 42, 0.08);
}

.hero {
  padding: 26px;
  margin-bottom: 18px;
}

.eyebrow,
.section-title,
.page-kicker {
  font: 700 12px/1.2 Arial, sans-serif;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow {
  color: var(--accent);
  background: var(--accent-soft);
  width: fit-content;
  padding: 5px 10px;
  border-radius: 999px;
}

h1,
h2,
h3,
h4 {
  font-family: Georgia, "Times New Roman", serif;
  margin: 0;
}

.lede,
p,
li {
  line-height: 1.55;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0 8px;
}

.stat {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fbfdff;
  font: 600 13px/1.2 Arial, sans-serif;
}

.toolbar {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.8fr);
  margin-top: 20px;
}

.toolbar label {
  display: grid;
  gap: 6px;
  font: 600 13px/1.3 Arial, sans-serif;
  color: var(--muted);
}

.toolbar input,
.toolbar select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: 16px/1.4 Georgia, "Times New Roman", serif;
}

.workspace {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 16px;
}

.sidebar,
.column > .panel,
.detail-panel {
  padding: 18px;
}

.sidebar {
  position: sticky;
  top: 18px;
  align-self: start;
  max-height: calc(100vh - 36px);
  overflow: auto;
}

.section-title {
  color: var(--muted);
  margin-bottom: 12px;
}

.chapter-list {
  display: grid;
  gap: 8px;
}

.chapter {
  display: grid;
  gap: 3px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fbfdff;
  cursor: pointer;
  text-align: left;
}

.chapter.active {
  background: var(--accent-soft);
  border-color: #b7d1e3;
}

.chapter small {
  color: var(--muted);
  font: 12px/1.2 Arial, sans-serif;
}

.main {
  display: grid;
  gap: 16px;
}

.page-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  gap: 14px;
}

.page-card {
  display: grid;
  gap: 10px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  cursor: pointer;
}

.page-card.figure-led {
  border-color: #bfd6e7;
  background: linear-gradient(180deg, #ffffff 0%, #f9fcff 100%);
}

.page-card.selected {
  border-color: #8ab1cb;
  box-shadow: 0 0 0 2px rgba(13, 79, 124, 0.08);
}

.page-card-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: start;
}

.page-card h3 {
  font-size: 1.08rem;
  margin-top: 4px;
}

.source-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 11px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fbfdff;
  font: 600 12px/1 Arial, sans-serif;
  white-space: nowrap;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font: 600 12px/1 Arial, sans-serif;
}

.pill.muted {
  background: #f2f5f7;
  color: var(--muted);
}

.pill.soft {
  background: #f7f9fb;
  color: #385064;
  border: 1px solid #dbe6ee;
}

.pill.accent {
  background: #d8ebfb;
  color: #114b78;
  border: 1px solid #9cc7e8;
}

.snippet {
  margin: 0;
  color: #2c3a46;
}

.meta {
  color: var(--muted);
  font: 13px/1.4 Arial, sans-serif;
}

.parts-preview {
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--warm);
  color: #5d4b1f;
  font: 13px/1.45 Arial, sans-serif;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.detail-empty,
.empty {
  padding: 18px;
  border: 1px dashed var(--line);
  border-radius: 12px;
  background: #fbfdff;
  color: var(--muted);
}

.detail-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
  margin-bottom: 16px;
}

.detail-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.detail-grid section,
.supporting {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fcfeff;
}

.figure-badge {
  display: inline-flex;
  align-items: center;
  margin-top: 4px;
  padding: 3px 8px;
  border-radius: 999px;
  background: #f0f6fb;
  color: #35536b;
  font: 600 12px/1 Arial, sans-serif;
}

.enrichment-list {
  display: grid;
  gap: 10px;
}

.enrichment-card {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.enrichment-card h5 {
  margin: 0 0 4px;
  font: 700 14px/1.3 Arial, sans-serif;
}

.enrichment-card p {
  margin: 0 0 8px;
  color: var(--muted);
  font: 13px/1.45 Arial, sans-serif;
}

.enrichment-card a {
  font-weight: 700;
}

.enrichment-detail {
  display: inline-block;
  margin-left: 6px;
  color: var(--muted);
  font: 12px/1.3 Arial, sans-serif;
}

.enrichment-part {
  display: inline-flex;
  align-items: center;
  margin-right: 8px;
  padding: 2px 7px;
  border-radius: 999px;
  background: #eef4f8;
  border: 1px solid #d5e2ec;
  color: #385064;
  font: 700 11px/1 Arial, sans-serif;
  white-space: nowrap;
}

.enrichment-empty {
  margin: 0;
  color: var(--muted);
  font: 13px/1.45 Arial, sans-serif;
}

.raw-excerpt {
  margin-top: 12px;
  color: var(--muted);
  font: 13px/1.5 Arial, sans-serif;
}

.raw-excerpt summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.raw-excerpt p {
  margin: 8px 0 0;
  color: var(--ink);
}

.stack {
  margin: 0;
  padding-left: 18px;
}

.supporting {
  margin-top: 14px;
}

@media (max-width: 1100px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    max-height: none;
  }
}

@media (max-width: 760px) {
  .toolbar {
    grid-template-columns: 1fr;
  }

  .page-card-head,
  .detail-head {
    flex-direction: column;
  }
}