/* From Generation to Guarantee - companion site
   UGA light academic theme. No external fonts, no external assets. */

:root {
  --red: #BA0C2F;
  --black: #000000;
  --muted: #5F6A72;
  --line: #E3E3E3;
  --bg-alt: #F6F6F6;
  --serif: Georgia, 'Times New Roman', serif;
  --sans: -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: #FFFFFF url("bg.svg") center bottom / cover no-repeat fixed;
  color: #1A1A1A;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
}

h1, h2, h3 { font-family: var(--serif); color: var(--black); }

a { color: var(--red); }
a:hover { color: #8E0A24; }

:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--red); color: #fff; padding: 8px 14px; z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ---------- header / nav ---------- */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: #FFFFFF;
  border-bottom: 1px solid var(--line);
}

.nav-row {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 8px; padding-top: 10px; padding-bottom: 10px;
}

.wordmark {
  display: inline-flex; align-items: center; gap: 9px;
  font-weight: 700; color: var(--black); text-decoration: none;
  font-size: 17px; letter-spacing: 0.2px;
}
.wordmark:hover { color: var(--black); }
.glyph {
  width: 13px; height: 13px; background: var(--red);
  display: inline-block; flex: none;
}

.nav-pills {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-wrap: wrap; gap: 4px;
}
.pill {
  display: inline-block; padding: 6px 14px; border-radius: 999px;
  color: var(--black); text-decoration: none; font-size: 14px; font-weight: 500;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.pill:hover, .pill.active { background: var(--red); color: #FFFFFF; }

/* ---------- sections ---------- */

.section { padding: 56px 0; scroll-margin-top: 76px; }
.section.alt { background: var(--bg-alt); }

.section-head { display: flex; align-items: center; gap: 14px; margin-bottom: 22px; }
.section-head h2 {
  margin: 0; font-size: 28px; position: relative; padding-bottom: 10px;
}
.section-head h2::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 58px; height: 3px; background: var(--red);
}

.date-pill {
  background: var(--red); color: #FFFFFF; border-radius: 999px;
  font-size: 12.5px; font-weight: 600; padding: 4px 12px; letter-spacing: 0.4px;
}

.section-lede { color: var(--muted); max-width: 70ch; margin: 0 0 22px; }

.card {
  background: #FFFFFF; border: 1px solid var(--line); border-radius: 10px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  padding: 20px 22px;
}

/* ---------- overview / hero ---------- */

#overview { padding-top: 64px; }
.kicker {
  color: var(--red); font-weight: 700; text-transform: uppercase;
  letter-spacing: 1.6px; font-size: 12.5px; margin: 0 0 10px;
}
h1 { font-size: 42px; line-height: 1.12; margin: 0 0 10px; }
.subtitle {
  font-family: var(--serif); font-size: 20px; color: #333;
  margin: 0 0 14px; max-width: 62ch;
}
.authors { color: var(--muted); margin: 0 0 24px; }

.stat-chips { display: flex; flex-wrap: wrap; gap: 10px; }
.stat-chip {
  border: 1px solid var(--line); border-radius: 8px; background: #FFFFFF;
  padding: 8px 14px; font-size: 14px; color: var(--muted);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}
.stat-chip strong { color: var(--black); font-size: 16px; margin-right: 4px; }

/* ---------- citation ---------- */

.cite-card p { margin-top: 0; }
.cite-card blockquote {
  margin: 14px 0; padding: 14px 18px;
  border-left: 3px solid var(--red); background: var(--bg-alt);
  font-family: var(--serif); font-size: 16.5px; color: #222;
}
.btn-primary {
  background: var(--red); color: #FFFFFF; border: none; border-radius: 6px;
  font: 600 14px var(--sans); padding: 9px 16px; cursor: pointer;
}
.btn-primary:hover { background: #8E0A24; }

/* ---------- pipeline ---------- */

.pipeline-card { padding: 14px; }
.pipeline-scroll { overflow-x: auto; }
.pipeline { display: block; width: 1000px; max-width: none; height: auto; min-width: 860px; }
@media (min-width: 1080px) { .pipeline { width: 100%; } }
.pipeline text { font-family: var(--sans); }
.chip-kicker {
  fill: #FFFFFF; opacity: 0.85; font-size: 10px; font-weight: 600;
  letter-spacing: 1.4px; text-anchor: middle;
}
.chip-main { fill: #FFFFFF; font-size: 15px; font-weight: 700; text-anchor: middle; }
.loop-label { fill: var(--muted); font-size: 12px; font-style: italic; text-anchor: middle; }

/* ---------- statistics ---------- */

.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.stats-grid h3 { margin: 0 0 14px; font-size: 18px; }
.stats-grid svg { display: block; width: 100%; height: auto; }
.bar-label { font-family: var(--sans); font-size: 12px; fill: #1A1A1A; }
.bar-value { font-family: var(--sans); font-size: 11.5px; fill: var(--muted); }
.axis-label { font-family: var(--sans); font-size: 10px; fill: var(--muted); }

/* ---------- explorer toolbar ---------- */

.toolbar { margin-bottom: 20px; }
.dd-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

.dropdown { position: relative; }
.dd-btn {
  background: #FFFFFF; border: 1px solid var(--line); border-radius: 7px;
  font: 500 14px var(--sans); color: var(--black);
  padding: 8px 14px; cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px;
}
.dd-btn:hover { border-color: #C8C8C8; }
.dd-btn[aria-expanded="true"] { border-color: var(--red); }
.dd-btn .caret {
  width: 0; height: 0; border-left: 4.5px solid transparent;
  border-right: 4.5px solid transparent; border-top: 5.5px solid var(--muted);
  transition: transform 0.15s ease;
}
.dd-btn[aria-expanded="true"] .caret { transform: rotate(180deg); }
.dd-btn .dd-count {
  background: var(--red); color: #fff; border-radius: 999px;
  font-size: 11px; font-weight: 700; padding: 1px 7px;
}

.dd-panel {
  position: absolute; top: calc(100% + 6px); left: 0; z-index: 40;
  min-width: 215px; max-height: 260px; overflow-y: auto;
  background: #FFFFFF; border: 1px solid var(--line); border-radius: 8px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.10);
  padding: 8px;
}
.dd-panel label {
  display: flex; align-items: center; gap: 8px;
  font-size: 13.5px; padding: 6px 8px; border-radius: 5px; cursor: pointer;
}
.dd-panel label:hover { background: var(--bg-alt); }
.dd-panel input[type="checkbox"] { accent-color: var(--red); margin: 0; }
.swatch {
  width: 10px; height: 10px; border-radius: 50%; display: inline-block; flex: none;
}

.reset-btn {
  background: none; border: none; color: var(--red); cursor: pointer;
  font: 600 14px var(--sans); padding: 8px 10px; text-decoration: underline;
}
.reset-btn:hover { color: #8E0A24; }

.search-row {
  display: flex; flex-wrap: wrap; align-items: center; gap: 14px;
  margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line);
}
#search {
  flex: 1 1 260px; max-width: 430px;
  border: 1px solid var(--line); border-radius: 7px;
  font: 14px var(--sans); padding: 9px 12px; color: #1A1A1A; background: #fff;
}
#search:focus { border-color: var(--red); outline: none; }
.count { color: var(--muted); font-size: 14px; }

/* ---------- scatter chart ---------- */

.chart-card { padding: 18px; }
.legend { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 10px; }
.legend-group { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.legend-group-title {
  font-size: 12px; font-weight: 700; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.8px; margin-right: 4px;
}
.legend-item {
  display: inline-flex; align-items: center; gap: 6px;
  background: #FFFFFF; border: 1px solid var(--line); border-radius: 999px;
  font: 12.5px var(--sans); color: #1A1A1A;
  padding: 4px 11px; cursor: pointer;
}
.legend-item:hover { border-color: #C8C8C8; }
.legend-item[aria-pressed="false"] { opacity: 0.38; }
.legend-item svg { display: block; }
.legend-count { color: var(--muted); font-size: 11.5px; }

.chart-wrap { position: relative; }
.chart-scroll { overflow-x: auto; }
#scatter { display: block; }
#scatter .lane-line { stroke: #D7D7D7; stroke-dasharray: 4 4; }
#scatter .grid-line { stroke: #EFEFEF; }
#scatter .lane-label { font: 12px var(--sans); fill: #1A1A1A; }
#scatter .tick-label { font: 11px var(--sans); fill: var(--muted); }
#scatter .marker { cursor: pointer; stroke: #FFFFFF; stroke-width: 1; }
#scatter .marker:hover { stroke: var(--black); }

/* lineage edge layer: subtle by default, the dots stay dominant */
#scatter .edge {
  fill: none; stroke: #C9CED4; stroke-width: 1; opacity: 0.55;
  pointer-events: none;
}
#scatter .edge.edge-hi { stroke-width: 2; opacity: 0.9; }

/* citation focus layer: drawn only for the hovered or pinned paper,
   never en masse; sits above lineage edges, below markers */
#scatter .focus-layer { pointer-events: none; }
#scatter .cite-out { stroke-width: 1; opacity: 0.55; }   /* stroke set inline (category colour) */
#scatter .cite-in { stroke: #8B949E; stroke-width: 1; stroke-dasharray: 4 3; opacity: 0.6; }

#scatter .marker.marker-dim { opacity: 0.25; }
#scatter .marker.marker-connected {
  stroke: #1A1A1A; stroke-width: 2;
  transform-box: fill-box; transform-origin: center; transform: scale(1.2);
}

.tooltip {
  position: absolute; z-index: 45; pointer-events: none;
  max-width: 330px; background: #FFFFFF;
  border: 1px solid var(--line); border-top: 3px solid var(--red);
  border-radius: 6px; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.13);
  padding: 10px 12px; font-size: 12.5px; line-height: 1.45;
}
.tooltip .tt-title { font-weight: 700; color: var(--black); margin-bottom: 3px; }
.tooltip .tt-meta { color: var(--muted); }
.tooltip .tt-lineage {
  margin-top: 4px; padding-top: 4px; border-top: 1px dashed var(--line);
  color: #5F6A72; font-size: 12px;
}
.tooltip .tt-cites {
  margin-top: 4px; padding-top: 4px; border-top: 1px dashed var(--line);
  color: #5F6A72; font-size: 12px;
}

.chart-note { color: var(--muted); font-size: 13px; margin: 12px 0 0; }

/* ---------- paper list ---------- */

.paper-group {
  background: #FFFFFF; border: 1px solid var(--line); border-radius: 10px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04); margin-bottom: 14px;
}
.paper-group summary {
  display: flex; align-items: center; gap: 11px;
  padding: 15px 20px; cursor: pointer; list-style: none;
  font-family: var(--serif); font-size: 18px; font-weight: 700; color: var(--black);
}
.paper-group summary::-webkit-details-marker { display: none; }
.paper-group summary .dot {
  width: 12px; height: 12px; border-radius: 50%; flex: none;
}
.paper-group summary .badge {
  background: var(--bg-alt); border: 1px solid var(--line); border-radius: 999px;
  font: 600 12px var(--sans); color: var(--muted); padding: 2px 10px;
}
.paper-group summary .chevron {
  margin-left: auto; width: 9px; height: 9px; flex: none;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(45deg); transition: transform 0.15s ease;
}
.paper-group[open] summary .chevron { transform: rotate(225deg); }
.paper-group[open] summary { border-bottom: 1px solid var(--line); }

.table-scroll { overflow-x: auto; padding: 6px 20px 18px; }
.paper-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 640px; }
.paper-table th {
  text-align: left; color: var(--muted); font-weight: 600; font-size: 12px;
  text-transform: uppercase; letter-spacing: 0.6px;
  padding: 10px 10px 8px; border-bottom: 2px solid var(--line);
}
.paper-table td {
  padding: 9px 10px; border-bottom: 1px solid #EFEFEF; vertical-align: top;
}
.paper-table tr:last-child td { border-bottom: none; }
.paper-table .t-title { font-weight: 600; color: #1A1A1A; }
.paper-table .t-authors, .paper-table .t-venue { color: var(--muted); }
.paper-table .t-year { white-space: nowrap; }
.paper-table a { font-weight: 600; text-decoration: none; }
.paper-table a:hover { text-decoration: underline; }
.empty-row td { color: var(--muted); font-style: italic; }

/* ---------- footer ---------- */

.site-footer {
  background: var(--black); color: #FFFFFF;
  border-top: 3px solid var(--red);
  padding: 30px 0; margin-top: 0;
}
.site-footer p { margin: 0 0 6px; font-size: 14.5px; }
.footer-muted { color: #B9BDC1; font-size: 13px; }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .stats-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  h1 { font-size: 32px; }
  .subtitle { font-size: 17px; }
  .section { padding: 42px 0; }
  .nav-row { justify-content: center; }
  #scatter { min-width: 1080px; }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* ---------- faint scene background: let it peek through ---------- */
.section.alt { background-color: rgba(246,246,246,0.84); }
.site-header { background: rgba(255,255,255,0.92); backdrop-filter: saturate(1.1) blur(2px); }

/* ---------- interactive core-thesis ---------- */
.lede-hint { color: var(--red); font-weight: 600; white-space: nowrap; }
.thesis-card { padding: 18px 18px 22px; }
.thesis-scroll { overflow-x: auto; }
.thesis-svg { width: 100%; min-width: 720px; height: auto; display: block; }

.thesis-svg .flow { stroke: #9aa0a6; stroke-width: 2; }
.thesis-svg .loop-seg { fill: none; stroke: #9aa0a6; stroke-width: 1.6; stroke-dasharray: 6 5; }

.pillar { cursor: pointer; }
.pillar rect { transition: transform .15s ease, filter .15s ease; transform-box: fill-box; transform-origin: center; }
.pillar[data-stage="tail"] rect { fill: #E08A3C; }
.pillar[data-stage="gen"]  rect { fill: #BA0C2F; }
.pillar[data-stage="und"]  rect { fill: #1F4E94; }
.pillar[data-stage="gua"]  rect { fill: #00A3AD; }
.pillar:hover rect, .pillar:focus-visible rect, .pillar.active rect {
  filter: drop-shadow(0 3px 8px rgba(0,0,0,0.28)); transform: scale(1.04);
}
.pillar:focus { outline: none; }
.pillar .chip-kicker { fill: #fff; font-size: 11px; font-weight: 700; letter-spacing: .12em; text-anchor: middle; opacity: .9; }
.pillar .chip-main { fill: #fff; font-size: 16px; font-weight: 700; text-anchor: middle; font-family: var(--serif); }

.gap-dot { fill: var(--red); stroke: #fff; stroke-width: 2; animation: gappulse 1.8s ease-in-out infinite; transform-box: fill-box; transform-origin: center; }
@keyframes gappulse { 0%,100% { opacity: .55; r: 8; } 50% { opacity: 1; r: 11; } }
.gap-label { fill: var(--red); font-size: 14px; font-weight: 700; text-anchor: middle; }
.gap-sub { fill: var(--muted); font-size: 12px; text-anchor: middle; }
.pillar.gap:hover .gap-dot, .pillar.gap.active .gap-dot { animation: none; opacity: 1; }

.thesis-detail {
  margin-top: 14px; padding: 14px 16px; border-left: 4px solid var(--red);
  background: rgba(186,12,47,0.05); border-radius: 4px; min-height: 84px;
}
.td-tag {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--red); margin-bottom: 4px;
}
.td-text { margin: 0; color: #2a2a2a; }

/* ---------- header logo ---------- */
.logo-img { height: 48px; width: auto; display: block; }
.wordmark-fallback { display: inline-block; font-weight: 700; color: var(--black); font-size: 16px; letter-spacing: 0.2px; }
.wordmark { gap: 11px; }