/* ═══════════════════════════════════════════════════════════════
   CHURN LAB — page-specific styles
   Inherits typography, color tokens, masthead, colophon from main.css.
   All colors via var(--ink), var(--ink-soft), var(--ink-dim),
   var(--paper), var(--paper-2), var(--accent).
   ═══════════════════════════════════════════════════════════════ */

.churn-main { position: relative; z-index: 1; }

/* ── Active nav link ──────────────────────────────────────── */
.masthead-nav a.active {
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
}

/* ── Hero / Title ─────────────────────────────────────────── */
.churn-hero {
  padding: 140px 48px 64px;
  max-width: 1080px;
}
.churn-title {
  margin-top: 18px;
}
.churn-kicker {
  margin-top: 32px; max-width: 620px;
  font-size: 18px; line-height: 1.55; color: var(--ink-soft);
}
.churn-dateline {
  margin-top: 48px;
  display: flex; gap: 40px; flex-wrap: wrap;
  font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-dim);
}
.churn-dateline .label { opacity: 0.6; }
.churn-dateline .value { color: var(--ink); margin-top: 4px; text-transform: none; letter-spacing: 0.06em; }

/* ── Section wrapper ──────────────────────────────────────── */
.churn-section {
  padding: 72px 48px;
  max-width: 1180px;
  margin: 0 auto;
}
.churn-section + .churn-section { padding-top: 56px; }
.churn-section > .section-label { margin-bottom: 28px; }

.churn-prose p {
  max-width: 720px;
  font-size: 17px; line-height: 1.65; color: var(--ink-soft);
  margin: 0 0 22px 0;
}
.churn-prose em { font-style: italic; color: var(--ink); }

/* Business lede — first paragraph of § I, sized up for scannability */
.churn-prose .churn-lede {
  font-family: 'Newsreader', serif;
  font-weight: 300;
  font-size: 26px; line-height: 1.4;
  letter-spacing: -0.005em;
  color: var(--ink);
  max-width: 780px;
  margin-bottom: 28px;
  text-wrap: balance;
}
.churn-prose .churn-footnote {
  font-size: 14px; line-height: 1.6;
  color: var(--ink-dim);
  max-width: 720px;
  padding-top: 14px;
  border-top: 1px solid color-mix(in oklab, var(--ink) 10%, transparent);
}
.churn-prose .churn-footnote em { color: var(--ink-soft); }

/* Dollar figures and percentages inside prose */
.headline-num {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.churn-lede .headline-num {
  font-weight: 400;
}
.section-link {
  border-bottom: 1px solid color-mix(in oklab, var(--ink) 35%, transparent);
  color: var(--ink);
  transition: border-color 160ms;
}
.section-link:hover { border-bottom-color: var(--accent); color: var(--accent); }

.churn-note {
  max-width: 720px;
  font-size: 15px; line-height: 1.6; color: var(--ink-soft);
  margin: 0 0 28px 0;
}

/* ── Data profile strip ───────────────────────────────────── */
#profile-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.profile-sub {
  margin-top: 24px; font-size: 11px; letter-spacing: 0.12em;
  color: var(--ink-dim); text-transform: uppercase;
}

/* ── Model comparison table ───────────────────────────────── */
.table-wrap { overflow-x: auto; }
.model-table {
  width: 100%; border-collapse: collapse;
  margin-top: 8px;
  font-variant-numeric: tabular-nums;
}
.model-table th, .model-table td {
  text-align: right;
  padding: 14px 12px;
  border-bottom: 1px solid color-mix(in oklab, var(--ink) 14%, transparent);
  font-size: 14px;
}
.model-table th {
  font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-dim);
  border-bottom: 1px solid var(--ink);
  font-weight: 400;
}
.model-table th:first-child,
.model-table td:first-child {
  text-align: left;
}
.model-table td.name {
  font-family: 'Newsreader', serif; font-weight: 300;
  font-size: 22px;
  color: var(--ink);
}
.model-table td.is-best {
  color: var(--accent);
  position: relative;
}
.model-table td.is-best::after {
  content: '';
  position: absolute; left: 0; right: 0; bottom: -1px;
  height: 2px; background: var(--accent);
  opacity: 0.75;
}

/* ── Chart frame (shared) ─────────────────────────────────── */
.chart-frame {
  position: relative;
  background: var(--paper-2);
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  padding: 28px;
  margin-top: 4px;
}
.chart-corners { position: absolute; inset: 0; pointer-events: none; }
.chart-corners .cc {
  position: absolute; width: 10px; height: 10px; opacity: 0.45;
}
.chart-corners .cc.tl { top: 0; left: 0; border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.chart-corners .cc.tr { top: 0; right: 0; border-top: 1px solid var(--ink); border-right: 1px solid var(--ink); }
.chart-corners .cc.bl { bottom: 0; left: 0; border-bottom: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.chart-corners .cc.br { bottom: 0; right: 0; border-bottom: 1px solid var(--ink); border-right: 1px solid var(--ink); }
.chart-svg {
  display: block; width: 100%; height: auto;
  overflow: visible;
}
.chart-readout {
  position: absolute; top: 14px; right: 18px;
  font-size: 10.5px; letter-spacing: 0.1em;
  color: var(--ink-dim); text-transform: uppercase;
  background: color-mix(in oklab, var(--paper) 85%, transparent);
  padding: 4px 8px;
  pointer-events: none;
}
.chart-readout .label { color: var(--accent); }
.chart-readout .value { color: var(--ink); }
.chart-legend {
  margin-top: 14px;
  display: flex; gap: 22px; flex-wrap: wrap;
  font-size: 10.5px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-dim);
}
.chart-legend .sw {
  display: inline-block;
  width: 20px; height: 2px;
  vertical-align: middle; margin-right: 8px;
}
.fig-caption {
  margin-top: 14px;
  font-size: 11px; letter-spacing: 0.1em;
  color: var(--ink-dim); text-transform: uppercase;
  max-width: 720px;
}
.chart-frame .frame-label {
  position: absolute; top: 10px; left: 14px;
  font-size: 10px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-dim);
  z-index: 2; pointer-events: none;
}

/* SVG tokens — drawn via <style> in JS but also usable here */
.chart-svg .axis,
.chart-svg .gridline {
  stroke: var(--ink);
  stroke-opacity: 0.18;
}
.chart-svg .axis { stroke-opacity: 0.5; }
.chart-svg .tick-label {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  fill: var(--ink-dim);
  letter-spacing: 0.08em;
}
.chart-svg .axis-label {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  fill: var(--ink-dim);
  text-transform: uppercase;
  letter-spacing: 0.14em;
}
.chart-svg .series {
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round; stroke-linejoin: round;
}
.chart-svg .series-ink { stroke: var(--ink); }
.chart-svg .series-accent { stroke: var(--accent); }
.chart-svg .series-dim { stroke: var(--ink-dim); }
.chart-svg .bar { fill: var(--ink); }
.chart-svg .bar-alt { fill: var(--accent); }
.chart-svg .dot {
  fill: var(--ink);
  fill-opacity: 0.35;
}
.chart-svg .dot-accent {
  fill: var(--accent);
  fill-opacity: 0.55;
}
.chart-svg .hover-dot {
  fill: var(--accent);
  stroke: var(--paper);
  stroke-width: 1.5;
  pointer-events: none;
}
.chart-svg .hover-line {
  stroke: var(--ink);
  stroke-opacity: 0.35;
  stroke-dasharray: 3 3;
  pointer-events: none;
}

/* ── Live scoring widget ──────────────────────────────────── */
.scoring-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
  margin-top: 8px;
}
.scoring-inputs {
  display: flex; flex-direction: column; gap: 20px;
}
.score-input-row {
  display: grid;
  grid-template-columns: 130px 1fr 72px;
  gap: 14px;
  align-items: center;
}
.score-input-row label {
  font-family: 'DM Mono', monospace;
  font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--ink-dim);
}
.score-input-row input[type="range"] { width: 100%; }
.score-input-row .val {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  text-align: right;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* Range inputs — themed */
input[type="range"] {
  -webkit-appearance: none; appearance: none;
  background: transparent;
  height: 22px;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: color-mix(in oklab, var(--ink) 60%, transparent);
  border-radius: 0;
}
input[type="range"]::-moz-range-track {
  height: 2px;
  background: color-mix(in oklab, var(--ink) 60%, transparent);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  margin-top: -7px;
  border-radius: 50%;
  background: var(--paper);
  border: 1.5px solid var(--ink);
  transition: transform 140ms, background 140ms;
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--paper);
  border: 1.5px solid var(--ink);
}
input[type="range"]:hover::-webkit-slider-thumb,
input[type="range"]:focus::-webkit-slider-thumb { background: var(--accent); transform: scale(1.1); }
input[type="range"]:hover::-moz-range-thumb,
input[type="range"]:focus::-moz-range-thumb { background: var(--accent); }

/* Toggle / select */
.score-toggle-row {
  display: flex; gap: 20px; flex-wrap: wrap; align-items: center;
  padding-top: 6px;
}
.score-toggle {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: 'DM Mono', monospace;
  font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--ink-dim);
  cursor: pointer; user-select: none;
}
.score-toggle input[type="checkbox"] { display: none; }
.score-toggle .box {
  width: 14px; height: 14px;
  border: 1.5px solid var(--ink);
  background: var(--paper);
  position: relative;
}
.score-toggle input[type="checkbox"]:checked + .box::after {
  content: ''; position: absolute; inset: 2px;
  background: var(--accent);
}
.score-select-row {
  display: flex; gap: 16px; flex-wrap: wrap; padding-top: 4px;
}
.score-select {
  display: inline-flex; flex-direction: column; gap: 6px;
}
.score-select label {
  font-family: 'DM Mono', monospace;
  font-size: 10.5px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-dim);
}
.score-select select {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid color-mix(in oklab, var(--ink) 30%, transparent);
  padding: 6px 10px;
  border-radius: 0;
  cursor: pointer;
  min-width: 120px;
}
.score-select select:focus { outline: 1px solid var(--accent); outline-offset: 1px; }

/* Scoring output */
.scoring-output {
  background: var(--paper-2);
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  padding: 28px;
  position: sticky; top: 80px;
}
.score-label {
  font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-dim);
}
.score-number {
  font-size: 72px; font-weight: 300;
  line-height: 1; letter-spacing: -0.02em;
  color: var(--accent);
  margin: 6px 0 20px;
  font-variant-numeric: tabular-nums;
}
.score-bar {
  position: relative;
  height: 8px;
  background: color-mix(in oklab, var(--ink) 12%, transparent);
  overflow: hidden;
}
.score-bar-fill {
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 0%;
  background: var(--accent);
  transition: width 220ms cubic-bezier(0.4, 0, 0.2, 1);
}
.score-bar-ticks {
  position: absolute; inset: 0;
  pointer-events: none;
}
.score-bar-ticks span {
  position: absolute; top: -4px; bottom: -4px;
  width: 1px;
  background: color-mix(in oklab, var(--ink) 25%, transparent);
}
.score-verdict {
  margin-top: 12px;
  font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-dim);
}
.score-contrib {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid color-mix(in oklab, var(--ink) 18%, transparent);
}
.score-contrib-head {
  font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-dim);
  margin-bottom: 14px;
}
.score-contrib-cols {
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px;
}
.score-dir {
  font-size: 10px; letter-spacing: 0.12em;
  text-transform: uppercase;
  padding-bottom: 4px;
  border-bottom: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
}
.score-dir.up   { color: var(--accent); }
.score-dir.down { color: var(--ink); }
.score-contrib ul {
  list-style: none; padding: 0; margin: 8px 0 0;
  display: flex; flex-direction: column; gap: 8px;
}
.score-contrib li {
  display: flex; justify-content: space-between; gap: 10px;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
}
.score-contrib li .f {
  font-family: 'Newsreader', serif; font-weight: 300;
}
.score-contrib li .v {
  font-family: 'DM Mono', monospace;
  color: var(--ink-dim);
}
.score-footnote {
  margin-top: 20px;
  font-size: 10.5px; line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
  text-transform: none;
}

/* ── Threshold tuning box ─────────────────────────────────── */
.threshold-box {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 32px;
  background: var(--paper-2);
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
}
.threshold-slider-wrap {
  position: relative;
}
.threshold-slider-wrap input[type="range"] {
  width: 100%; height: 26px;
}
.threshold-track-overlay {
  position: absolute;
  top: 10px; left: 0; right: 0;
  height: 4px;
  pointer-events: none;
}
.threshold-track-overlay::before {
  content: ''; position: absolute;
  top: 1px; width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  left: var(--opt-x, 50%);
  transform: translate(-4px, -3px);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 22%, transparent);
}
.threshold-readout {
  margin-top: 12px;
  font-size: 12px; letter-spacing: 0.08em;
  color: var(--ink-dim); text-transform: uppercase;
}
.threshold-readout #thr-value {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

/* Confusion matrix 2x2 grid */
.cm-grid {
  display: grid;
  grid-template-columns: 26px 90px 1fr 1fr;
  grid-template-rows: 22px 28px 1fr 1fr;
  grid-template-areas:
    ".      .        axtop    axtop"
    ".      .        head1    head2"
    "axleft rowlbl1  cell1    cell2"
    "axleft rowlbl2  cell3    cell4";
  column-gap: 8px;
  row-gap: 8px;
  max-width: 600px;
}
.cm-axis-top {
  grid-area: axtop;
  font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-dim);
  text-align: center;
}
.cm-axis-left {
  grid-area: axleft;
  display: flex; align-items: center; justify-content: center;
  font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-dim);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}
.cm-header {
  font-size: 10.5px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-dim);
  text-align: center;
  align-self: end;
}
.cm-head-stayed  { grid-area: head1; }
.cm-head-churned { grid-area: head2; }

.cm-row-label {
  font-size: 10.5px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-dim);
  display: flex; align-items: center; justify-content: flex-end;
  padding-right: 10px;
}
.cm-row-stayed  { grid-area: rowlbl1; }
.cm-row-churned { grid-area: rowlbl2; }
.cm-cell[data-cell="tn"] { grid-area: cell1; }
.cm-cell[data-cell="fp"] { grid-area: cell2; }
.cm-cell[data-cell="fn"] { grid-area: cell3; }
.cm-cell[data-cell="tp"] { grid-area: cell4; }
.cm-cell {
  padding: 22px 18px;
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  background: var(--paper);
  display: flex; flex-direction: column; justify-content: space-between;
  min-height: 110px;
}
.cm-cell[data-cell="tp"] { border-color: var(--accent); }
.cm-cell[data-cell="tn"] { border-color: color-mix(in oklab, var(--ink) 40%, transparent); }
.cm-val {
  font-size: 40px; font-weight: 300; line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.cm-cell[data-cell="tp"] .cm-val,
.cm-cell[data-cell="fn"] .cm-val { color: var(--accent); }
.cm-cell[data-cell="fp"] .cm-val,
.cm-cell[data-cell="tn"] .cm-val { color: var(--ink); }
.cm-lbl {
  font-size: 10px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-dim);
}

.threshold-stats {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}
.threshold-stats .metric-value { font-size: 40px; }
.threshold-caption {
  font-size: 11px; letter-spacing: 0.1em;
  color: var(--ink-dim); text-transform: uppercase;
  max-width: 720px;
}

/* ── SHAP dependence grid ─────────────────────────────────── */
.dep-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
  margin-top: 4px;
}

/* ── Fairness ─────────────────────────────────────────────── */
.fairness-wrap {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
  margin-top: 4px;
}
.fairness-panel {
  background: var(--paper-2);
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  padding: 28px;
}
.fairness-panel-head {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-dim);
  padding-bottom: 10px;
  border-bottom: 1px solid color-mix(in oklab, var(--ink) 25%, transparent);
  margin-bottom: 20px;
}
.fairness-panel-head .title { color: var(--ink); }
.fairness-row {
  display: grid;
  grid-template-columns: 88px 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px dashed color-mix(in oklab, var(--ink) 14%, transparent);
}
.fairness-row:last-child { border-bottom: none; }
.fairness-row .name {
  font-family: 'Newsreader', serif;
  font-size: 18px;
  color: var(--ink);
  font-weight: 300;
}
.fairness-row .bars {
  display: flex; flex-direction: column; gap: 4px;
}
.fairness-bar {
  position: relative;
  height: 8px;
  background: color-mix(in oklab, var(--ink) 10%, transparent);
}
.fairness-bar-fill {
  position: absolute; left: 0; top: 0; bottom: 0;
}
.fairness-bar-fill.actual { background: var(--ink); }
.fairness-bar-fill.flagged { background: var(--accent); }
.fairness-bar-label {
  position: absolute; right: 6px; top: 50%;
  transform: translateY(-50%);
  font-family: 'DM Mono', monospace;
  font-size: 9.5px; letter-spacing: 0.08em;
  color: var(--ink-dim);
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
}
.fairness-row .stats {
  text-align: right;
  font-family: 'DM Mono', monospace;
  font-size: 11px; color: var(--ink-dim);
  font-variant-numeric: tabular-nums;
}
.fairness-row .stats .acc {
  color: var(--ink);
  font-size: 20px;
  font-family: 'Newsreader', serif;
  font-weight: 300;
  display: block;
  letter-spacing: -0.01em;
}
.fairness-legend {
  margin-top: 16px;
  display: flex; gap: 20px;
  font-family: 'DM Mono', monospace;
  font-size: 10px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-dim);
}
.fairness-legend .sw {
  display: inline-block; width: 14px; height: 8px;
  vertical-align: middle; margin-right: 6px;
}
.fairness-legend .sw.actual  { background: var(--ink); }
.fairness-legend .sw.flagged { background: var(--accent); }

/* ── Methodology grid ─────────────────────────────────────── */
.method-grid {
  margin-top: 12px;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px 48px;
}
.method-head {
  font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-dim);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--ink);
  margin-bottom: 12px;
}
.method-grid p {
  margin: 0;
  font-size: 15px; line-height: 1.6;
  color: var(--ink-soft);
}
.method-ctas {
  margin-top: 48px;
  display: flex; gap: 16px; flex-wrap: wrap;
}
.method-ctas .btn-outline {
  padding: 12px 20px;
  color: var(--ink); border: 1px solid var(--ink);
  border-radius: 999px;
  font-family: 'DM Mono', monospace;
  font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: background 200ms, color 200ms;
}
.method-ctas .btn-outline:hover {
  background: var(--ink); color: var(--paper);
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 1000px) {
  .scoring-grid { grid-template-columns: 1fr; gap: 32px; }
  .scoring-output { position: static; }
  .dep-grid { grid-template-columns: 1fr; }
  .fairness-wrap { grid-template-columns: 1fr; }
  .method-grid { grid-template-columns: 1fr; gap: 28px; }
  #profile-grid { grid-template-columns: repeat(3, 1fr); }
  .threshold-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 700px) {
  .churn-hero { padding: 110px 24px 40px; }
  .churn-section { padding: 56px 24px; }
  .churn-title { font-size: 56px; }
  .churn-dateline { gap: 20px; }
  #profile-grid { grid-template-columns: repeat(2, 1fr); }
  .score-input-row { grid-template-columns: 96px 1fr 60px; gap: 10px; }
  .score-input-row label { font-size: 10px; }
  .cm-grid {
    grid-template-columns: 18px 68px 1fr 1fr;
    grid-template-rows: 18px 68px 1fr 1fr;
  }
  .cm-cell { padding: 14px 10px; min-height: 86px; }
  .cm-val { font-size: 30px; }
  .model-table th, .model-table td { padding: 10px 6px; font-size: 12px; }
  .model-table td.name { font-size: 18px; }
  .method-ctas { flex-direction: column; align-items: stretch; }
  .method-ctas .btn-outline { text-align: center; }
}