.research {
  --chart-accent: var(--primary);
  --chart-context: #a9aec2;
  --chart-grid: var(--border);
  --chart-axis: var(--border-strong);
  --label-col: minmax(150px, 250px);
}

@media (prefers-color-scheme: dark) {
  .research {
    --chart-accent: #7d75f7;
    --chart-context: #555b7a;
  }
}

/* Phones: the label sits above its bar so task names are never cut off. */
@media (max-width: 560px) {
  .research .bar-axis,
  .research .bar-row {
    grid-template-columns: 1fr;
    padding-right: 14px;
  }

  .research .bar-axis > span:first-child {
    display: none;
  }

  .research .bar-row {
    min-height: 0;
    padding: 5px 0 7px;
  }

  .research .bar-label span {
    white-space: normal;
  }

  .research .bar-track {
    min-height: 18px;
  }
}

.doc-head {
  max-width: 860px;
  padding-top: 20px;
}

.doc-head h1 {
  margin-top: 14px;
}

.doc-section {
  margin-top: 56px;
}

.doc-section > p {
  max-width: 80ch;
}

/* ---------- Stat tiles ---------- */

.stat-row {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr));
  margin-top: 28px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--muted);
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

/* ---------- Bar chart ---------- */

.chart-card {
  padding: 18px 18px 14px;
}

.chart-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--muted);
}

.legend-key {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.key {
  width: 14px;
  height: 10px;
  border-radius: 0 3px 3px 0;
}

.key-accent {
  background: var(--chart-accent);
}

.key-context {
  background: var(--chart-context);
}

.bar-axis,
.bar-row {
  display: grid;
  grid-template-columns: var(--label-col) 1fr;
  column-gap: 12px;
  padding-right: 18px;
}

.axis-ticks {
  position: relative;
  height: 20px;
  font-size: 0.75rem;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

.axis-ticks > span {
  position: absolute;
  top: 0;
  transform: translateX(-50%);
  white-space: nowrap;
}

.axis-ticks > span:first-child {
  transform: none;
}

.axis-ticks > span:last-child {
  transform: translateX(-70%);
}

.bar-row {
  min-height: 30px;
  border-radius: 8px;
  cursor: default;
  outline: none;
}

.bar-row:hover .bar-label,
.bar-row:focus-visible .bar-label {
  color: var(--text);
}

.bar-row:focus-visible {
  box-shadow: 0 0 0 2px var(--primary-soft);
}

.bar-label {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.bar-label b {
  flex: none;
  min-width: 22px;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.bar-label span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bar-track {
  display: flex;
  align-items: center;
  border-left: 1px solid var(--chart-axis);
  background-image: linear-gradient(to right, var(--chart-grid) 1px, transparent 1px);
  background-size: 25% 100%;
  box-shadow: inset -1px 0 0 var(--chart-grid);
}

.bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 14px;
  border-radius: 0 4px 4px 0;
  background: var(--chart-context);
  transition: filter 0.12s;
}

.bar.is-accent {
  background: var(--chart-accent);
}

.bar-row:hover .bar,
.bar-row:focus-visible .bar {
  filter: brightness(1.12);
}

.bar-value {
  font-size: 0.78rem;
  font-weight: 650;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  margin-left: 6px;
}

.bar .bar-value {
  margin: 0 6px 0 0;
  color: #171a2b;
}

.bar.is-accent .bar-value {
  color: #fff;
}

.bar-empty {
  margin-left: 8px;
  font-size: 0.8rem;
  color: var(--muted);
}

.chart-tooltip {
  position: fixed;
  z-index: 50;
  pointer-events: none;
  display: grid;
  gap: 2px;
  min-width: 160px;
  max-width: 260px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: var(--shadow);
  font-size: 0.85rem;
}

.tooltip-value {
  font-size: 1.05rem;
  font-weight: 700;
}

.tooltip-name {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
}

.tooltip-name::before {
  content: "";
  width: 12px;
  height: 2px;
  border-radius: 2px;
  background: var(--key, var(--chart-context));
}

.tooltip-note {
  color: var(--faint);
  font-size: 0.8rem;
}

.chart-table {
  margin-top: 14px;
}

.chart-table summary {
  cursor: pointer;
  color: var(--primary);
  font-weight: 600;
}

.chart-table .table-wrap {
  margin-top: 10px;
}

.source-note {
  margin-top: 10px;
}

/* ---------- Lists & cards ---------- */

.change-list,
.principles,
.sources {
  padding: 0;
  margin: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  max-width: 860px;
}

.change-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.change-list .task-num {
  flex: none;
}

.principles li {
  padding-left: 18px;
  position: relative;
  color: var(--muted);
}

.principles li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary);
}

.principles b {
  color: var(--text);
}

.sources li::before {
  content: "↗ ";
  color: var(--faint);
}

.mechanics {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr));
}

.mechanic {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--text);
}

.mechanic h3,
.mechanic p {
  margin: 0;
}

.mechanic p {
  color: var(--muted);
  font-size: 0.93rem;
}

.mechanic.is-ready {
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}

.mechanic.is-ready:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}

.mechanic:not(.is-ready) {
  background: var(--surface-2);
  box-shadow: none;
}

.mechanic-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.mechanic-head .task-num {
  padding: 0 10px;
}