/* ==========================================================================
   Case studies (UX analyses) — extra styles on top of style.css
   --------------------------------------------------------------------------
   1. Chart colours (light + dark)
   2. Chapters, statements and stat tiles
   3. Figures (frame, header, data table)
   4. Chart pieces (axes, bars, strip, heatmap, scores, scatter)
   5. Tooltip
   6. Mobile tweaks
   ========================================================================== */


/* 1. CHART COLOURS ------------------------------------------------------- */

/* One red ramp, validated for colour-blind safety: light -> dark.
   --viz-3 is the highlight colour; grey is "everything else". */
:root {
  --viz-1: #eb9580;
  --viz-2: #e0603f;
  --viz-3: #c4321a;
  --viz-context: #c4c4c4;
  --viz-grid: #ececec;
  --viz-empty: #f4f4f4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --viz-1: #8a3524;
    --viz-2: #cc4a2e;
    --viz-3: #ff6a4d;
    --viz-context: #4a4a4a;
    --viz-grid: #1d1d1d;
    --viz-empty: #141414;
  }
}


/* 2. CHAPTERS, STATEMENTS, STAT TILES ------------------------------------ */

.cs-lede {
  font-weight: 500;
  font-size: 56px;
  line-height: 1;
  letter-spacing: -0.045em;
  max-width: 1200px;
  margin: 120px 0;
}
.cs-lede .muted { color: var(--muted); }

/* A numbered chapter opener: thin number left, statement right */
.cs-chapter {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  border-top: 2px solid var(--text);
  padding-top: 16px;
  margin-top: 240px;
}
.cs-chapter-num {
  font-weight: 100;
  font-size: 120px;
  line-height: 0.85;
  letter-spacing: -0.05em;
}
.cs-chapter-label { font-size: 16px; margin-top: 16px; }
.cs-chapter h2 {
  font-weight: 500;
  font-size: 48px;
  line-height: 1;
  letter-spacing: -0.04em;
}
.cs-chapter + .row { border-top: 0; padding-top: 48px; }

/* Body text that sits in the right half */
.cs-text { margin-left: calc(50% + var(--gap) / 2); max-width: 680px; padding-top: 48px; }
.cs-text p + p { margin-top: 24px; }
.cs-text h3 { font-size: 16px; font-weight: 500; margin: 48px 0 12px; }
.cite { color: var(--muted); font-size: 14px; vertical-align: super; line-height: 0; }

/* Stat tiles: a row of big numbers hung from a hairline */
.cs-stats {
  display: grid;
  grid-template-columns: repeat(var(--cols, 4), minmax(0, 1fr));
  gap: var(--gap);
  margin-top: 64px;
}
.cs-stat { border-top: 1px solid var(--line); padding-top: 12px; }
.cs-stat-label { font-size: 16px; }
.cs-stat-value {
  font-weight: 500;
  font-size: 80px;
  line-height: 1;
  letter-spacing: -0.05em;
  margin: 32px 0 12px;
}
.cs-stat-note { font-size: 14px; color: var(--muted); max-width: 280px; }

/* The one hero number at the top of the summary */
.cs-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  align-items: end;
  border-top: 2px solid var(--text);
  padding-top: 16px;
}
.cs-hero-value {
  font-weight: 500;
  font-size: 320px;
  line-height: 0.8;
  letter-spacing: -0.06em;
  margin-top: 48px;
}
.cs-hero-value span { color: var(--viz-3); }
.cs-hero > p { font-size: 20px; max-width: 520px; }

/* Numbered key findings */
.cs-findings { list-style: none; margin-top: 64px; border-top: 1px solid var(--line); }
.cs-findings li {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}
.cs-findings .k { display: flex; gap: 24px; font-weight: 500; font-size: 32px; line-height: 1; letter-spacing: -0.03em; }
.cs-findings .k span { font-weight: 100; min-width: 56px; }
.cs-findings p:last-child { color: var(--muted); max-width: 560px; font-size: 18px; }

/* A pull quote */
.cs-quote {
  margin: 120px 0 0 calc(50% + var(--gap) / 2);
  max-width: 680px;
  font-family: "Serifman", Georgia, serif;
  font-style: italic;
  font-size: 40px;
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.cs-quote cite { display: block; margin-top: 16px; font-family: "Sansman", Arial, sans-serif; font-style: normal; font-size: 14px; color: var(--muted); letter-spacing: 0; }


/* 3. FIGURES -------------------------------------------------------------- */

.fig { margin-top: 120px; border-top: 1px solid var(--text); padding-top: 12px; }
.fig-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  font-size: 16px;
}
.fig-head .fig-title { font-weight: 500; }
.fig-head .fig-title span { color: var(--muted); font-weight: 400; margin-right: 16px; }
.fig-head p:last-child { color: var(--muted); max-width: 560px; }
.fig-body { margin-top: 48px; position: relative; }
.fig-foot {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  margin-top: 24px;
  font-size: 14px;
  color: var(--muted);
}

/* "View data" table under every chart */
.fig-data summary { cursor: pointer; list-style: none; color: var(--text); }
.fig-data summary::-webkit-details-marker { display: none; }
.fig-data summary::after { content: " +"; }
.fig-data[open] summary::after { content: " −"; }
.fig-data table { width: 100%; border-collapse: collapse; margin-top: 12px; font-variant-numeric: tabular-nums; }
.fig-data th, .fig-data td { text-align: left; padding: 6px 8px 6px 0; border-bottom: 1px solid var(--line); font-weight: 400; }
.fig-data th { color: var(--muted); }
.fig-data td { color: var(--text); }

/* Legend: a swatch beside plain text */
.legend { display: flex; flex-wrap: wrap; gap: 8px 24px; font-size: 14px; margin-bottom: 24px; }
.legend span { display: inline-flex; align-items: center; gap: 8px; }
.legend i { width: 12px; height: 12px; border-radius: 2px; display: inline-block; background: var(--viz-context); }
.legend i.outline { background: transparent; box-shadow: inset 0 0 0 1px var(--text); }


/* 4. CHART PIECES ---------------------------------------------------------- */

.chart svg { display: block; width: 100%; overflow: visible; }
.chart text { fill: var(--muted); font-family: "Sansman", Arial, sans-serif; font-size: 13px; font-variant-numeric: tabular-nums; }
.chart text.ink { fill: var(--text); font-weight: 500; }
.chart text.label { fill: var(--text); font-size: 14px; }
.chart .grid { stroke: var(--viz-grid); stroke-width: 1; }
.chart .axis { stroke: var(--line); stroke-width: 1; }
.chart .hit { fill: transparent; cursor: default; }
.chart .hit:hover + .mark, .chart .mark-group:hover .mark { opacity: 0.75; }

/* Onboarding step strip */
.strip { display: grid; grid-template-columns: repeat(var(--n), minmax(0, 1fr)); gap: 2px; }
.strip-step { font-size: 12px; line-height: 1.2; }
.strip-step .block {
  height: 72px;
  background: var(--viz-context);
  border-radius: 4px 4px 0 0;
  display: flex;
  align-items: flex-end;
  padding: 8px;
  color: var(--text);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}
.strip-step.value .block { background: var(--viz-3); color: #fff; }
.strip-step.account .block { background: transparent; box-shadow: inset 0 0 0 1px var(--text); }
.strip-step p { margin-top: 8px; padding-right: 6px; }
.strip-step p.muted { margin-top: 4px; }
.strip-marker { display: grid; grid-template-columns: repeat(var(--n), minmax(0, 1fr)); gap: 2px; margin-top: 16px; font-size: 13px; }
.strip-marker div { border-top: 1px solid var(--text); padding-top: 6px; }

/* Stacked session bar */
.stack { display: flex; gap: 2px; height: 56px; }
.stack div { min-width: 2px; background: var(--viz-context); }
.stack div:first-child { border-radius: 4px 0 0 4px; }
.stack div:last-child { border-radius: 0 4px 4px 0; }
.stack div.hl { background: var(--viz-3); }
.stack-labels { display: flex; gap: 2px; font-size: 13px; margin-bottom: 8px; }
.stack-labels div { min-width: 2px; white-space: nowrap; overflow: visible; }
.stack-scale { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); margin-top: 8px; font-variant-numeric: tabular-nums; }
.stack-key { list-style: none; margin-top: 32px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: var(--gap); font-size: 14px; }
.stack-key li { display: flex; justify-content: space-between; gap: 16px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.stack-key li span:first-child { display: inline-flex; gap: 8px; align-items: center; }
.stack-key i { width: 10px; height: 10px; border-radius: 2px; background: var(--viz-context); }
.stack-key i.hl { background: var(--viz-3); }
.stack-key li span:last-child { font-variant-numeric: tabular-nums; color: var(--muted); }

/* Heatmap */
.heat-scroll { overflow-x: auto; }
.heat { display: grid; grid-template-columns: 200px repeat(var(--cols), minmax(56px, 104px)) 140px; gap: 2px; min-width: 760px; font-size: 13px; }
.heat .h { color: var(--muted); padding: 0 4px 8px 0; align-self: end; line-height: 1.15; }
.heat .r { padding-right: 8px; align-self: center; font-size: 15px; }
.heat .c { height: 28px; border-radius: 2px; background: var(--viz-empty); }
.heat .c[data-v="1"] { background: var(--viz-1); }
.heat .c[data-v="2"] { background: var(--viz-2); }
.heat .c[data-v="3"] { background: var(--viz-3); }
.heat .t { display: flex; align-items: center; gap: 8px; padding-left: 24px; font-variant-numeric: tabular-nums; }
.heat .t i { height: 8px; border-radius: 0 4px 4px 0; background: var(--text); display: block; }
.heat-legend { display: flex; gap: 2px; align-items: center; font-size: 13px; color: var(--muted); margin-top: 24px; }
.heat-legend i { width: 40px; height: 12px; border-radius: 2px; background: var(--viz-empty); display: block; }
.heat-legend span { margin: 0 12px 0 6px; }

/* Heuristic score rows */
.scores { border-top: 1px solid var(--line); }
.score-row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1.2fr) minmax(0, 1fr) 48px;
  gap: var(--gap);
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
}
.score-row .n { color: var(--muted); font-variant-numeric: tabular-nums; }
.score-row .v { text-align: right; font-variant-numeric: tabular-nums; font-weight: 500; }
.track { position: relative; height: 12px; }
.track::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; border-top: 1px solid var(--line); }
.track .tick { position: absolute; top: 2px; width: 1px; height: 8px; background: var(--line); }
.track .fill { position: absolute; left: 0; top: 5px; height: 2px; background: var(--text); }
.track .dot {
  position: absolute; top: 50%; width: 14px; height: 14px; margin: -7px 0 0 -7px;
  border-radius: 50%; background: var(--text); box-shadow: 0 0 0 2px var(--background);
}
.score-row.low .dot, .score-row.low .fill { background: var(--viz-3); }
.score-avg { display: grid; grid-template-columns: 40px minmax(0, 1.2fr) minmax(0, 1fr) 48px; gap: var(--gap); font-size: 14px; color: var(--muted); padding-top: 10px; }
.score-avg .v { text-align: right; color: var(--text); font-weight: 500; }

/* Issue register */
.register { border-top: 1px solid var(--text); font-size: 16px; }
.register-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 2fr) minmax(0, 1fr) 140px;
  gap: var(--gap);
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.register-row.head { color: var(--muted); font-size: 14px; padding: 8px 0; }
.register-row .id { color: var(--muted); font-variant-numeric: tabular-nums; }
.register-row .title { font-weight: 500; }
.register-row .desc { color: var(--muted); margin-top: 6px; max-width: 620px; font-size: 15px; }
.sev { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; }
.sev i { width: 12px; height: 12px; border-radius: 2px; }
.sev[data-s="3"] i { background: var(--viz-3); }
.sev[data-s="2"] i { background: var(--viz-2); }
.sev[data-s="1"] i { background: var(--viz-1); }
.sev b { font-weight: 400; letter-spacing: 2px; color: var(--muted); }

/* Severity summary bars */
.sev-summary { display: grid; gap: 10px; margin-bottom: 48px; max-width: 680px; margin-left: calc(50% + var(--gap) / 2); }
.sev-summary div { display: grid; grid-template-columns: 96px 1fr 24px; gap: 12px; align-items: center; font-size: 14px; }
.sev-summary span { display: block; }
.sev-summary .bar { display: block; height: 16px; border-radius: 0 4px 4px 0; }
.sev-summary span:last-child { text-align: right; font-variant-numeric: tabular-nums; }

/* Growth model (state flow) */
.flow { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 2px; }
.flow-node { background: var(--panel-soft); padding: 16px; min-height: 160px; display: flex; flex-direction: column; justify-content: space-between; position: relative; }
.flow-node .s { font-size: 13px; color: var(--muted); }
.flow-node .name { font-weight: 500; font-size: 24px; line-height: 1; letter-spacing: -0.03em; }
.flow-node.hl { background: var(--viz-3); color: #fff; }
.flow-node.hl .s { color: rgba(255, 255, 255, 0.8); }
.flow-node::after { content: "→"; position: absolute; right: -11px; top: 50%; transform: translateY(-50%); z-index: 1; color: var(--muted); background: var(--background); line-height: 1; padding: 2px 0; font-size: 14px; }
.flow-node:last-child::after { display: none; }
.flow-returns { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 2px; margin-top: 2px; font-size: 13px; }
.flow-returns div { border-top: 1px solid var(--line); padding-top: 8px; color: var(--muted); }
.flow-returns div b { color: var(--text); font-weight: 500; display: block; margin-bottom: 4px; }
.flow-returns .back { border-top-color: var(--text); }

/* Horizontal bars */
.hbars { border-top: 1px solid var(--line); }
.hbar-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr) 64px; gap: var(--gap); align-items: center; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 16px; }
.hbar-track { height: 16px; }
.hbar { display: block; height: 16px; border-radius: 0 4px 4px 0; background: var(--viz-context); }
.hbar.hl { background: var(--viz-3); }
.hbar-v { text-align: right; font-variant-numeric: tabular-nums; font-weight: 500; }

/* Ranges (interquartile bar + median dot) */
.range-row { display: grid; grid-template-columns: 120px minmax(0, 1fr) 64px; gap: var(--gap); align-items: center; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 16px; }
.range-axis { border-bottom: 1px solid var(--text); padding: 0 0 8px; font-size: 13px; color: var(--muted); }
.range-track { position: relative; height: 16px; }
.range-axis .range-track { height: 14px; }
.range-tick { position: absolute; transform: translateX(-50%); font-variant-numeric: tabular-nums; }
.range-grid { position: absolute; top: -10px; bottom: -10px; width: 1px; background: var(--viz-grid); }
.range-bar { position: absolute; top: 4px; height: 8px; border-radius: 4px; background: var(--viz-context); min-width: 4px; }
.range-dot { position: absolute; top: 50%; width: 14px; height: 14px; margin: -7px 0 0 -7px; border-radius: 50%; background: var(--viz-3); box-shadow: 0 0 0 2px var(--background); }
.range-dot.ink { background: var(--text); }
.run-dot { width: 12px; height: 12px; margin: -6px 0 0 -6px; opacity: 0.9; }
.legend i.round { border-radius: 50%; }
.range-note { position: absolute; left: 0; top: 0; font-size: 14px; color: var(--muted); }
.range-v { text-align: right; font-variant-numeric: tabular-nums; font-weight: 500; }

/* Annotated screenshot */
.pins-frame { position: relative; border: 1px solid var(--line); }
.pins-frame img { width: 100%; display: block; }
.pin {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--text); color: var(--background);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 13px; font-variant-numeric: tabular-nums; flex-shrink: 0;
}
.pins-frame .pin { position: absolute; transform: translate(-50%, -50%); box-shadow: 0 0 0 2px var(--background); cursor: default; }
.pin.hl { background: var(--viz-3); color: #fff; }
.pins-key { list-style: none; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 var(--gap); margin-top: 32px; border-top: 1px solid var(--line); }
.pins-key li { display: flex; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.pins-title { font-weight: 500; font-size: 16px; }
.pins-desc { color: var(--muted); font-size: 14px; margin-top: 4px; max-width: 520px; }

/* Screenshot beside a chart */
.shot-pair { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: calc(var(--gap) * 3); align-items: start; }
.shot-pair img { width: 100%; max-width: 360px; border: 1px solid var(--line); display: block; }
.shot-pair figcaption, .shot-cap { font-size: 14px; color: var(--muted); margin-top: 8px; }
.shot-single { max-width: 600px; }
.shot-single img { width: 100%; border: 1px solid var(--line); display: block; }

/* Percentage heatmap: values printed in cells */
.heat.heat-pct { grid-template-columns: 140px repeat(var(--cols), minmax(64px, 120px)); min-width: 600px; }
.heat-pct .c { display: flex; align-items: center; justify-content: center; font-size: 13px; font-variant-numeric: tabular-nums; color: var(--text); height: 28px; }
.heat-pct .c[data-v="3"] { color: #fff; }

/* Balance list: what works */
.cs-balance { display: grid; grid-template-columns: repeat(var(--cols, 3), minmax(0, 1fr)); gap: var(--gap); margin-top: 64px; }
.cs-balance div { border-top: 2px solid var(--text); padding-top: 12px; }
.cs-balance h4 { font-weight: 500; font-size: 24px; line-height: 1.05; letter-spacing: -0.02em; margin-bottom: 12px; }
.cs-balance p { color: var(--muted); font-size: 16px; }

/* Scatter number key (shown on narrow screens) */
.scatter-key { list-style: none; columns: 2; column-gap: var(--gap); font-size: 14px; margin-top: 16px; }
.scatter-key li { padding: 4px 0; break-inside: avoid; }
.scatter-key li span { color: var(--muted); display: inline-block; width: 28px; font-variant-numeric: tabular-nums; }

/* Recommendations list */
.recs { list-style: none; border-top: 1px solid var(--line); margin-top: 48px; }
.recs li { display: grid; grid-template-columns: 56px minmax(0, 1fr) calc(50% - var(--gap) / 2); gap: var(--gap); padding: 24px 0; border-bottom: 1px solid var(--line); }
.recs .id { color: var(--muted); }
.recs h4 { font-weight: 500; font-size: 24px; line-height: 1.05; letter-spacing: -0.02em; }
.recs p { color: var(--muted); font-size: 16px; }
.recs .meta { margin-top: 12px; font-size: 14px; color: var(--text); }

/* Sources */
.sources { list-style: none; font-size: 14px; counter-reset: src; }
.sources li { padding: 8px 0; border-bottom: 1px solid var(--line); color: var(--muted); counter-increment: src; display: grid; grid-template-columns: 32px 1fr; }
.sources li::before { content: counter(src); color: var(--text); }


/* 5. TOOLTIP ---------------------------------------------------------------- */

.viz-tip {
  position: fixed;
  z-index: 20;
  pointer-events: none;
  background: var(--text);
  color: var(--background);
  font-size: 13px;
  line-height: 1.35;
  padding: 8px 10px;
  border-radius: 4px;
  max-width: 260px;
  font-variant-numeric: tabular-nums;
}
.viz-tip b { font-weight: 500; display: block; }


/* 6. MOBILE TWEAKS ---------------------------------------------------------- */

@media (max-width: 1100px) {
  .cs-hero-value { font-size: 200px; }
  .cs-lede { font-size: 44px; }
}

@media (max-width: 810px) {
  .cs-lede { font-size: 32px; margin: 64px 0; }
  .cs-chapter, .cs-hero, .fig-head, .fig-foot, .cs-findings li { grid-template-columns: 1fr; }
  .recs li { grid-template-columns: 40px minmax(0, 1fr); }
  .recs li > div { grid-column: 2; }
  .cs-chapter { margin-top: 140px; row-gap: 24px; }
  .cs-chapter-num { font-size: 80px; }
  .cs-chapter h2 { font-size: 32px; }
  .cs-text, .cs-quote, .sev-summary { margin-left: 0; }
  .cs-quote { font-size: 28px; margin-top: 64px; }
  .cs-hero-value { font-size: 140px; margin-top: 24px; }
  .cs-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 32px; }
  .cs-stat-value { font-size: 48px; margin: 20px 0 8px; }
  .cs-findings .k { font-size: 24px; gap: 12px; }
  .cs-findings .k span { min-width: 36px; }
  .fig { margin-top: 80px; }
  .fig-head, .fig-foot { row-gap: 8px; }
  .fig-body { margin-top: 32px; }

  .strip { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 16px; }
  .strip-step .block { height: 48px; }
  .strip-marker { display: none; }
  .stack-labels { display: none; }
  .stack-key { grid-template-columns: 1fr; }
  .score-row, .score-avg { grid-template-columns: 28px minmax(0, 1fr) 36px; }
  .score-row .track { grid-column: 2 / 4; grid-row: 2; }
  .register-row { grid-template-columns: 40px minmax(0, 1fr); }
  .register-row > :nth-child(3), .register-row > :nth-child(4) { grid-column: 2; }
  .register-row.head { display: none; }
  .flow, .flow-returns { grid-template-columns: 1fr; }
  .flow-node { min-height: 0; gap: 16px; }
  .flow { gap: 24px; }
  .flow-node::after { content: "↓"; right: auto; left: 16px; top: auto; bottom: -21px; transform: none; background: none; }
  .flow-returns { margin-top: 24px; }
  .recs h4 { font-size: 20px; }
  .hbar-row { grid-template-columns: minmax(0, 1fr) 52px; row-gap: 6px; }
  .hbar-row .hbar-track { grid-column: 1 / 3; grid-row: 2; }
  .range-row { grid-template-columns: 84px minmax(0, 1fr) 52px; font-size: 14px; }
  .pins-key { grid-template-columns: 1fr; }
  .pins-frame .pin { width: 20px; height: 20px; font-size: 11px; }
  .shot-pair { grid-template-columns: 1fr; gap: 32px; }
  .cs-balance { grid-template-columns: 1fr; row-gap: 32px; }
}