:root {
  /* Page theme colors. */
  --bg: #f7f8fb;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #111827;

  /* Multiple-image prior colors. Change these six values to update nodes, prior tabs, tooltips, and color legend together. */
  --category-polarization: #276c9e;
  --category-motion: #b42525;
  --category-stereo: #e6a757;
  --category-general: #329845;
  --category-flash: #c299db;
  --category-opposite: #3cb4b4;

  /* Single-image prior colors. Change these values to update its nodes, prior tabs, and color legend together. */
  --single-category-gradient: #276c9e;
  --single-category-manual: #7c3aed;
  --single-category-smooth: #e6a757;
  --single-category-deep: #b42525;
  --single-category-ghosting: #d97706;
  --single-category-data: #329845;
  --single-category-pano: #e4387e;

  --shadow: 0 18px 40px rgba(15, 23, 42, 0.18);

  /* Overall page content width: affects header, filter tabs, and timeline card container. */
  --content-width: 1720px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #eef4ff 0, transparent 34%), var(--bg);
  color: var(--text);
}

header,
.toolbar,
.wrap {
  transition: transform 260ms ease;
}

body.drawer-open header,
body.drawer-open .toolbar,
body.drawer-open .wrap {
  transform: translateX(-260px);
}

header {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 32px 28px 12px;
}

h1 {
  margin: 0;
  /* Main title font size: min / responsive / max. */
  font-size: clamp(24px, 3vw, 40px);
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.toolbar {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 16px 28px 0;
  display: flex;
  flex-wrap: wrap;
  /* Gap between filter tabs. */
  gap: 10px;
  align-items: center;
}

.inline-toolbar {
  margin: 0 -28px 14px;
  padding-top: 0;
}

.filter-label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-right: 2px;
  text-transform: uppercase;
}

.filter-break {
  flex-basis: 100%;
  height: 0;
}

.chip {
  border: 1px solid #d1d5db;
  background: rgba(255, 255, 255, 0.82);
  border-radius: 999px;
  padding: 8px 12px;
  /* Filter tab font size. */
  font-size: 13px;
  cursor: pointer;
  transition: 160ms ease;
  user-select: none;
}

.chip:hover,
.chip.active {
  color: white;
  border-color: transparent;
  transform: translateY(-1px);
}

.chip[data-filter="all"].active { background: #111827; }
.chip[data-filter="polarization"].active, .chip[data-filter="polarization"]:hover { background: var(--category-polarization); }
.chip[data-filter="motion"].active, .chip[data-filter="motion"]:hover { background: var(--category-motion); }
.chip[data-filter="stereo"].active, .chip[data-filter="stereo"]:hover { background: var(--category-stereo); }
.chip[data-filter="general"].active, .chip[data-filter="general"]:hover { background: var(--category-general); }
.chip[data-filter="flash"].active, .chip[data-filter="flash"]:hover { background: var(--category-flash); }
.chip[data-filter="opposite"].active, .chip[data-filter="opposite"]:hover { background: var(--category-opposite); }
.chip[data-filter="gradient"].active, .chip[data-filter="gradient"]:hover { background: var(--single-category-gradient); }
.chip[data-filter="manual"].active, .chip[data-filter="manual"]:hover { background: var(--single-category-manual); }
.chip[data-filter="smooth"].active, .chip[data-filter="smooth"]:hover { background: var(--single-category-smooth); }
.chip[data-filter="deep"].active, .chip[data-filter="deep"]:hover { background: var(--single-category-deep); }
.chip[data-filter="ghosting"].active, .chip[data-filter="ghosting"]:hover { background: var(--single-category-ghosting); }
.chip[data-filter="data"].active, .chip[data-filter="data"]:hover { background: var(--single-category-data); }
.chip[data-filter="pano"].active, .chip[data-filter="pano"]:hover { background: var(--single-category-pano); }
.chip[data-filter-type="structure"].active,
.chip[data-filter-type="structure"]:hover {
  background: #374151;
}

.wrap {
  max-width: var(--content-width);
  margin: 18px auto 42px;
  padding: 0 28px;
}

.timeline-card {
  position: relative;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(209, 213, 219, 0.86);
  border-radius: 28px;
  box-shadow: 0 22px 60px rgba(15, 23, 42, 0.08);
  overflow: hidden;
}

.timeline-section-title {
  margin: 34px 0 14px;
}

.timeline-section-title h2 {
  margin: 0;
  font-size: clamp(21px, 2.1vw, 30px);
  line-height: 1.12;
  letter-spacing: 0;
}

.stage {
  width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0 0 18px;
}

svg {
  /* Visible SVG size in the page. Change width/height to resize the timeline display. */
  width: 1600px;
  max-width: none;
  height: 860px;
  display: block;
}

.single-roadmap svg {
  width: 1660px;
  height: 900px;
}

.axis {
  stroke: var(--line);
  stroke-width: 2.3;
  stroke-linecap: round;
}

.axis.dashed {
  stroke-dasharray: 8 7;
}

.tick {
  stroke: var(--line);
  stroke-width: 1.6;
}

.year {
  /* Year tick label font size. */
  font-size: 15px;
  fill: #111827;
  font-weight: 650;
}

.paper-group {
  cursor: pointer;
  transition: opacity 180ms ease, transform 180ms ease;
  transform-box: fill-box;
  transform-origin: center;
}

.paper-group.dimmed {
  opacity: 0.13;
}

.paper-group:hover {
  transform: scale(1.055);
}

.stem {
  /* Vertical connector line thickness between axis and paper node. */
  stroke-width: 2.6;
  stroke-linecap: round;
}

.node-circle,
.node-diamond,
.node-triangle,
.node-rect,
.node-pentagon {
  fill: #fff;
  stroke-width: 3;
  filter: drop-shadow(0 2px 2px rgba(15, 23, 42, 0.12));
}

.paper-label {
  /* Paper author/title label font size beside each node. */
  font-size: 20px;
  text-anchor: middle;
  fill: #111827;
  paint-order: stroke;
  /* White outline around paper labels. Increase if labels are hard to read over lines. */
  stroke: rgba(255, 255, 255, 0.94);
  stroke-width: 4px;
  stroke-linejoin: round;
  pointer-events: auto;
  pointer-events: bounding-box;
}

.single-paper-group {
  cursor: pointer;
}

.single-paper-label {
  font-size: 20px;
  text-anchor: middle;
  fill: #111827;
  paint-order: stroke;
  stroke: rgba(255, 255, 255, 0.94);
  stroke-width: 4px;
  stroke-linejoin: round;
  pointer-events: auto;
  pointer-events: bounding-box;
}

.paper-label .author {
  font-family: "Times New Roman", Times, serif;
  font-weight: 800;
}

.paper-label .etal {
  font-family: "Times New Roman", Times, serif;
  font-style: italic;
  font-weight: 400;
}

.paper-label .title-line {
  font-family: "Times New Roman", Times, serif;
  font-weight: 400;
}

.single-paper-label .author {
  font-family: "Times New Roman", Times, serif;
  font-weight: 800;
}

.single-paper-label .etal {
  font-family: "Times New Roman", Times, serif;
  font-style: italic;
  font-weight: 400;
}

.single-paper-label .title-line {
  font-family: "Times New Roman", Times, serif;
  font-weight: 400;
}

.legend text {
  /* Bottom shape/color legend font size. */
  font-size: 14px;
  fill: #374151;
}

.legend-color.category-polarization { fill: var(--category-polarization); }
.legend-color.category-motion { fill: var(--category-motion); }
.legend-color.category-stereo { fill: var(--category-stereo); }
.legend-color.category-general { fill: var(--category-general); }
.legend-color.category-flash { fill: var(--category-flash); }
.legend-color.category-opposite { fill: var(--category-opposite); }

.legend-color.single-gradient { fill: var(--single-category-gradient); }
.legend-color.single-manual { fill: var(--single-category-manual); }
.legend-color.single-smooth { fill: var(--single-category-smooth); }
.legend-color.single-deep { fill: var(--single-category-deep); }
.legend-color.single-ghosting { fill: var(--single-category-ghosting); }
.legend-color.single-data { fill: var(--single-category-data); }
.legend-color.single-pano { fill: var(--single-category-pano); }

.tooltip {
  position: fixed;
  z-index: 30;
  width: min(420px, calc(100vw - 28px));
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(229, 231, 235, 0.96);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 16px;
  opacity: 0;
  pointer-events: none;
  user-select: text;
  transform: translateY(8px) scale(0.98);
  transition: opacity 130ms ease, transform 130ms ease;
}

.tooltip.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.tooltip-top {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.tooltip-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.copy-button {
  flex: 0 0 auto;
  border: 1px solid #d1d5db;
  background: #fff;
  border-radius: 999px;
  padding: 5px 10px;
  color: #374151;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

.copy-button:hover {
  border-color: #9ca3af;
  background: #f9fafb;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 4px 9px;
  color: white;
  font-size: 12px;
  font-weight: 700;
}

.venue {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.tooltip h2 {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.28;
  letter-spacing: -0.015em;
}

.tooltip .authors {
  margin: 0 0 12px;
  color: #374151;
  font-size: 13.5px;
  line-height: 1.45;
}

.meta-grid {
  display: grid;
  grid-template-columns: 82px 1fr;
  gap: 7px 10px;
  font-size: 13px;
  line-height: 1.45;
}

.meta-grid b {
  color: #111827;
}

.meta-grid span {
  color: #4b5563;
}

.tooltip-abstract {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.meta-grid a {
  color: #2563eb;
  font-weight: 700;
  text-decoration: none;
}

.meta-grid a:hover {
  text-decoration: underline;
}

.details-drawer {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 25;
  width: min(560px, calc(100vw - 24px));
  height: 100vh;
  background: rgba(255, 255, 255, 0.98);
  border-left: 1px solid rgba(209, 213, 219, 0.9);
  box-shadow: -24px 0 60px rgba(15, 23, 42, 0.18);
  transform: translateX(100%);
  transition: transform 260ms ease;
  overflow-y: auto;
  user-select: text;
}

.details-drawer.visible {
  transform: translateX(0);
}

.drawer-inner {
  padding: 28px 30px 34px;
}

.drawer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.drawer-title-block {
  min-width: 0;
}

.drawer-title {
  margin: 12px 0 8px;
  font-family: "Times New Roman", Times, serif;
  font-size: 26px;
  line-height: 1.16;
  font-weight: 700;
  letter-spacing: 0;
}

.drawer-authors {
  margin: 0;
  color: #374151;
  font-family: "Times New Roman", Times, serif;
  font-size: 17px;
  line-height: 1.35;
}

.drawer-close {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border: 1px solid #d1d5db;
  border-radius: 999px;
  background: #fff;
  color: #111827;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}

.drawer-close:hover {
  background: #f3f4f6;
  border-color: #9ca3af;
}

.drawer-section {
  padding: 18px 0;
  border-top: 1px solid #e5e7eb;
}

.drawer-section h3 {
  margin: 0 0 10px;
  color: #111827;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.drawer-section p {
  margin: 0;
  color: #374151;
  font-size: 14px;
  line-height: 1.62;
}

.drawer-grid {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 10px 14px;
  font-size: 14px;
  line-height: 1.45;
}

.drawer-grid b {
  color: #111827;
}

.drawer-grid span {
  color: #4b5563;
  min-width: 0;
  overflow-wrap: anywhere;
}

.drawer-grid a {
  color: #2563eb;
  font-weight: 700;
  text-decoration: none;
}

.drawer-grid a:hover {
  text-decoration: underline;
}

.load-error {
  max-width: var(--content-width);
  margin: 16px auto 0;
  padding: 12px 28px;
  color: #991b1b;
  font-size: 14px;
  font-weight: 700;
}

@media (max-width: 720px) {
  header, .toolbar, .wrap {
    padding-left: 16px;
    padding-right: 16px;
  }

  body.drawer-open header,
  body.drawer-open .toolbar,
  body.drawer-open .wrap {
    transform: none;
  }

  .timeline-card {
    border-radius: 20px;
  }
}