styles.css

:root {
  color-scheme: dark;
  --bg: #2e3440;
  --panel: #3b4252;
  --panel-strong: #434c5e;
  --ink: #eceff4;
  --muted: #d8dee9;
  --quiet: #aeb7c6;
  --line: #4c566a;
  --frost: #88c0d0;
  --frost-deep: #5e81ac;
  --green: #a3be8c;
  --yellow: #ebcb8b;
  --orange: #d08770;
  --red: #bf616a;
  --purple: #b48ead;
  --shadow: rgba(15, 17, 22, 0.28);
  --detail-bg: #3b4252;
  --code-bg: #242933;
  --edge: #8792a6;
  --node-bg: #3b4252;
  --topbar-bg: rgba(46, 52, 64, 0.94);
}

body[data-theme="original"] {
  color-scheme: light;
  --bg: #f5f2ea;
  --panel: #fffdf7;
  --panel-strong: #ffffff;
  --ink: #1f2528;
  --muted: #657073;
  --quiet: #8a9294;
  --line: #d9d0c1;
  --frost: #00756f;
  --frost-deep: #00564f;
  --green: #00564f;
  --yellow: #b98717;
  --orange: #b65439;
  --red: #b65439;
  --purple: #6c5aa8;
  --shadow: rgba(31, 37, 40, 0.14);
  --detail-bg: #fffdf7;
  --code-bg: #f5f2ea;
  --edge: #9d9283;
  --node-bg: #ffffff;
  --topbar-bg: rgba(255, 253, 247, 0.94);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Consolas, "Liberation Mono", Menlo, Monaco, monospace;
  line-height: 1.55;
}

button,
input {
  font: inherit;
}

a {
  color: var(--frost);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  z-index: 10;
  transform: translateY(-160%);
  border-radius: 6px;
  padding: 0.55rem 0.75rem;
  color: var(--bg);
  background: var(--yellow);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-shell {
  display: grid;
  grid-template-columns: 18rem minmax(0, 1fr);
  min-height: 100vh;
}

.site-sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  background: var(--bg);
}

.site-title {
  display: block;
  min-height: 3.75rem;
  border-bottom: 1px solid var(--line);
  padding: 1.05rem 1rem;
  color: var(--ink);
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 800;
}

.site-nav {
  padding: 0.75rem;
}

.nav-link {
  display: block;
  border-radius: 6px;
  padding: 0.55rem 0.65rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
}

.nav-link:hover,
.nav-link.active {
  color: var(--ink);
  background: var(--panel-strong);
}

.site-frame {
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  min-height: 3.75rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding: 0 1.25rem;
  background: var(--topbar-bg);
  backdrop-filter: blur(10px);
}

.mobile-brand {
  display: none;
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
}

.topbar-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

.theme-toggle {
  min-height: 2.25rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.4rem 0.65rem;
  color: var(--bg);
  background: var(--frost);
  cursor: pointer;
  font-weight: 800;
}

.theme-toggle:hover {
  background: var(--yellow);
}

.toggle-control {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.toggle-control input {
  accent-color: var(--frost);
}

.content-shell {
  width: min(76rem, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.page-header {
  padding: clamp(2rem, 6vw, 4.75rem) 0 2rem;
}

.page-header.compact {
  padding-top: 2rem;
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 15ch;
  margin-bottom: 1rem;
  font-size: clamp(2.55rem, 8vw, 6.5rem);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(1.35rem, 2.4vw, 2.1rem);
  line-height: 1.15;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 0.55rem;
  font-size: 1.05rem;
  letter-spacing: 0;
}

.lede {
  max-width: 48rem;
  color: var(--muted);
  font-size: clamp(1rem, 1.5vw, 1.18rem);
}

.summary-band,
.timeline-panel,
.lineage {
  margin-bottom: 1.25rem;
}

.summary-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--line);
  background: var(--panel);
}

.summary-band article {
  min-height: 9rem;
  padding: 1.15rem;
}

.summary-band article + article {
  border-left: 1px solid var(--line);
}

.summary-band span {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--quiet);
  font-size: 0.82rem;
  font-weight: 800;
}

.summary-band strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--ink);
  font-size: 1.12rem;
}

.summary-band p,
.lineage p,
.detail-card p {
  color: var(--muted);
}

.timeline-panel,
.doc-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 20px 58px var(--shadow);
  overflow: hidden;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
  padding: 1.15rem;
  border-bottom: 1px solid var(--line);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: flex-end;
}

.filter {
  min-height: 2.35rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.48rem 0.7rem;
  color: var(--muted);
  background: var(--bg);
  cursor: pointer;
  font-weight: 760;
}

.filter:hover,
.filter.active {
  border-color: var(--frost);
  color: var(--bg);
  background: var(--frost);
}

.visual-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.34fr);
  min-height: 39rem;
}

.chart-wrap {
  min-width: 0;
  overflow-x: auto;
  border-right: 1px solid var(--line);
}

#timeline {
  display: block;
  width: 100%;
  min-width: 1010px;
  height: 680px;
}

.detail-card {
  padding: 1.15rem;
  background: var(--panel-strong);
}

.detail-card h3 {
  margin-bottom: 0.25rem;
  font-size: 1.35rem;
  line-height: 1.12;
}

#detail-meta {
  margin-bottom: 1rem;
  color: var(--green);
  font-weight: 750;
}

.detail-visual {
  margin: 1.25rem 0 0;
}

#detail-image {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
}

.detail-image-bg {
  fill: var(--detail-bg);
  stroke: none;
}

.detail-visual figcaption {
  margin-top: 0.6rem;
  color: var(--quiet);
  font-size: 0.78rem;
  line-height: 1.4;
  text-align: center;
}

.lineage {
  padding: 2rem 0 0;
}

.lineage-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 1.25rem;
  border: 1px solid var(--line);
  background: var(--line);
}

.lineage-grid article {
  min-height: 12rem;
  padding: 1rem;
  background: var(--panel);
}

.sources-panel {
  margin-bottom: 4rem;
}

.source-list {
  margin: 0;
  padding: 1.25rem 1.25rem 1.25rem 2.5rem;
}

.source-list li + li {
  margin-top: 0.8rem;
}

.node {
  cursor: pointer;
}

.node rect {
  fill: var(--node-bg);
  stroke-width: 2;
  filter: drop-shadow(0 7px 12px rgba(15, 17, 22, 0.25));
}

.node text {
  fill: var(--ink);
  font-size: 13px;
  font-weight: 760;
  pointer-events: none;
}

.node .year {
  fill: var(--quiet);
  font-size: 12px;
  font-weight: 720;
}

.node.dim {
  opacity: 0.18;
}

.node.selected rect {
  stroke-width: 4;
}

.edge {
  fill: none;
  stroke: var(--edge);
  stroke-width: 2;
  marker-end: url(#arrow);
}

.edge.dim {
  opacity: 0.12;
}

.axis {
  stroke: var(--line);
  stroke-width: 1.5;
}

.axis-label {
  fill: var(--quiet);
  font-size: 12px;
  font-weight: 800;
}

.doc-panel {
  max-width: 58rem;
  margin: 0 auto;
}

.doc-header {
  border-bottom: 1px solid var(--line);
  padding: 1.4rem 1.5rem;
  background: var(--panel-strong);
}

.doc-header h1 {
  max-width: none;
  margin-bottom: 0;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.05;
}

.markdown-body,
.raw-markdown {
  padding: 1.5rem;
}

.markdown-body {
  color: var(--muted);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  color: var(--ink);
}

.markdown-body h1 {
  max-width: none;
  font-size: 2.1rem;
  line-height: 1.14;
}

.markdown-body h2 {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.markdown-body h3 {
  margin-top: 1.4rem;
  color: var(--green);
}

.markdown-body blockquote {
  margin: 1rem 0;
  border-left: 4px solid var(--frost);
  padding-left: 1rem;
  color: var(--ink);
}

.markdown-body code,
.raw-markdown {
  color: var(--green);
  background: var(--code-bg);
}

.markdown-body code {
  border-radius: 4px;
  padding: 0.1rem 0.25rem;
}

.markdown-body pre {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1rem;
  background: var(--code-bg);
}

.markdown-body pre code {
  padding: 0;
  background: transparent;
}

.markdown-body table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--line);
  padding: 0.55rem 0.65rem;
  vertical-align: top;
}

.markdown-body th {
  color: var(--ink);
  background: var(--panel-strong);
}

.raw-markdown {
  margin: 0;
  overflow-x: auto;
  white-space: pre-wrap;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
.node:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
}

/* Polish layer: micro-interactions and refinement.
   Uses only theme variables so both Nord and Original palettes are preserved. */

::selection {
  color: var(--bg);
  background: var(--frost);
}

body {
  -webkit-font-smoothing: antialiased;
}

body,
.site-sidebar,
.topbar,
.timeline-panel,
.doc-panel,
.summary-band,
.summary-band article,
.lineage-grid article,
.detail-card,
.doc-header,
.markdown-body blockquote,
.markdown-body pre,
.markdown-body th,
.markdown-body td {
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

a {
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--yellow);
}

.eyebrow {
  letter-spacing: 0.14em;
}

.nav-link {
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.nav-link:hover {
  transform: translateX(2px);
}

.nav-link.active {
  border-left-color: var(--frost);
}

.theme-toggle,
.filter {
  transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.theme-toggle:hover,
.filter:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px var(--shadow);
}

.theme-toggle:active,
.filter:active {
  transform: translateY(0);
}

.timeline-panel,
.doc-panel {
  border-radius: 12px;
  box-shadow: 0 1px 2px var(--shadow), 0 24px 64px var(--shadow);
}

.summary-band {
  border-radius: 12px;
  overflow: hidden;
}

.summary-band article:hover,
.lineage-grid article:hover {
  background: var(--panel-strong);
}

.lineage-grid {
  border-radius: 12px;
  overflow: hidden;
}

.doc-header {
  background: linear-gradient(135deg, var(--panel-strong), var(--panel));
}

.markdown-body h2 {
  margin-top: 2.4rem;
  border-top: 0;
  padding-top: 0;
}

.markdown-body h2::before {
  content: "";
  display: block;
  width: 3.5rem;
  height: 3px;
  margin-bottom: 0.85rem;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--frost), transparent);
}

.markdown-body blockquote {
  border-left: 3px solid var(--frost);
  border-radius: 0 8px 8px 0;
  padding: 0.85rem 1.1rem;
  background: var(--code-bg);
}

.markdown-body th {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.markdown-body tbody tr:hover td {
  background: var(--panel-strong);
}

.source-list li::marker {
  color: var(--frost);
}

.nav-sublink {
  margin-left: 0.9rem;
  border-left: 1px solid var(--line);
  border-radius: 0 6px 6px 0;
  padding-top: 0.42rem;
  padding-bottom: 0.42rem;
  font-size: 0.82rem;
}

.nav-sublink.active,
.nav-sublink:hover {
  border-left-color: var(--frost);
}

.markdown-body .md-img {
  display: block;
  width: 100%;
  max-width: 30rem;
  margin: 1.6rem auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem;
  background: var(--code-bg);
}

.chart-wrap,
.markdown-body pre,
.markdown-body table,
.raw-markdown,
.site-nav,
.site-sidebar {
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.node rect,
.node,
.edge {
  transition: opacity 0.2s ease;
}

.node:hover rect {
  stroke-width: 3.5;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

@media (max-width: 980px) {
  .site-shell {
    grid-template-columns: 1fr;
  }

  .site-sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .site-title {
    display: none;
  }

  .site-nav {
    display: flex;
    overflow-x: auto;
  }

  .nav-link {
    flex: 0 0 auto;
  }

  .mobile-brand {
    display: inline-block;
  }
}

@media (max-width: 860px) {
  .panel-head,
  .visual-grid,
  .summary-band,
  .lineage-grid {
    grid-template-columns: 1fr;
  }

  .summary-band article + article,
  .chart-wrap {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .panel-head {
    display: grid;
    align-items: start;
  }

  .controls {
    justify-content: start;
  }

  .visual-grid {
    min-height: 0;
  }

  .chart-wrap {
    border-right: 0;
  }

  #timeline {
    height: 620px;
  }
}