:root {
  --paper: #faf5ea;
  --paper-soft: #f3ecdc;
  --ink: #2b2620;
  --ink-soft: #514b42;
  --chalk: #b3541e;
  --chalk-strong: #7b350f;
  --terrain: #385438;
  --terrain-deep: #33482f;
  --line: #d8cdb6;
  --card: #fffdf7;
  --on-strong: #fffdf7;
  --focus: #1a5fb4;
  --figure-lit: #33302b;
  --figure-dim: #cfc4ad;
  --bar-track: #e7ddc8;
  --ok: #2f6b33;
  --funnel-wash: #e7dcc5;
  --abyss: #29352a;
  --abyss-edge: #4f6b4f;
  --on-abyss: #fffdf7;
}

[data-theme="dark"] {
  --paper: #22201c;
  --paper-soft: #2c2924;
  --ink: #f0e9da;
  --ink-soft: #cfc4ae;
  --chalk: #e89a55;
  --chalk-strong: #f2b47e;
  --terrain: #9db894;
  --terrain-deep: #c4d6bd;
  --line: #4a453b;
  --card: #2a2721;
  --on-strong: #22201c;
  --focus: #8ab4f8;
  --figure-lit: #efe6d3;
  --figure-dim: #57503f;
  --bar-track: #3a352c;
  --ok: #9ccc9c;
  --funnel-wash: #3a463a;
  --abyss: #111812;
  --abyss-edge: #9db894;
  --on-abyss: #f0e9da;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #22201c;
    --paper-soft: #2c2924;
    --ink: #f0e9da;
    --ink-soft: #cfc4ae;
    --chalk: #e89a55;
    --chalk-strong: #f2b47e;
    --terrain: #9db894;
    --terrain-deep: #c4d6bd;
    --line: #4a453b;
    --card: #2a2721;
    --on-strong: #22201c;
    --focus: #8ab4f8;
    --figure-lit: #efe6d3;
    --figure-dim: #57503f;
    --bar-track: #3a352c;
    --ok: #9ccc9c;
    --funnel-wash: #3a463a;
    --abyss: #111812;
    --abyss-edge: #9db894;
    --on-abyss: #f0e9da;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.125rem;
  line-height: 1.65;
}

h1, h2, h3 {
  line-height: 1.25;
  font-weight: 700;
}

a { color: var(--chalk-strong); }
[data-theme="dark"] a { color: var(--chalk); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) a { color: var(--chalk); }
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.75rem 1.25rem;
  min-height: 44px;
  z-index: 100;
  text-decoration: none;
}

.skip-link:focus { top: 0.5rem; }

.wrap {
  max-width: 75rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  border-bottom: 2px solid var(--line);
  padding: 0.55rem 0;
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
}

.site-brand {
  font-size: 1rem;
  color: var(--ink-soft);
  text-decoration: none;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.lang-switch a { color: var(--ink); }

button, .button-link {
  font: inherit;
  min-height: 44px;
  min-width: 44px;
  padding: 0.45rem 0.8rem;
  border-radius: 0.35rem;
  border: 2px solid var(--chalk-strong);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
}

.button-primary {
  background: var(--chalk-strong);
  color: var(--on-strong);
}

.controls {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.4rem;
  align-items: center;
  margin: 0;
}

.controls button {
  font-size: 0.9rem;
  line-height: 1.2;
  padding-inline: 0.7rem;
}

.controls [data-action="prev"] { margin-left: 0.35rem; }

.hero { padding: 0.85rem 0 0.5rem; }

.hero .kicker {
  color: var(--ink-soft);
  font-size: 0.88rem;
  line-height: 1.3;
  margin: 0 0 0.35rem;
}

.hero h1 {
  font-size: clamp(2rem, 3.4vw, 2.65rem);
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin: 0 0 0.55rem;
}

.answer {
  max-width: 72rem;
  font-size: 1.08rem;
  line-height: 1.42;
  border-left: 4px solid var(--terrain);
  padding-left: 0.75rem;
  margin: 0.5rem 0 0.75rem;
}

.key-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 0.7rem 0 0;
  padding: 0;
  list-style: none;
}

.key-metrics li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  padding: 0.65rem 0.85rem;
  min-width: 0;
  font-size: 0.9rem;
  line-height: 1.35;
}

.key-metrics .metric-value {
  display: block;
  font-size: 1.65rem;
  line-height: 1.05;
  color: var(--chalk-strong);
}

.funnel-section > h2 {
  font-size: clamp(1.35rem, 2.4vw, 1.8rem);
  margin: 0.7rem 0 0.15rem;
}

.funnel-intro {
  max-width: 72rem;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.45;
  margin: 0 0 0.7rem;
}

.funnel-scene {
  display: grid;
  gap: 0.45rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  padding: 0.55rem;
  margin: 0.7rem 0 1rem;
}

.step-list {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.4rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.step-list li { min-width: 0; }

.step-list button {
  width: 100%;
  min-height: 3rem;
  padding: 0.35rem 0.5rem;
  border-width: 1px;
  font-size: 0.78rem;
  line-height: 1.15;
}

.step-list [aria-current="step"] {
  background: var(--terrain-deep);
  border-color: var(--terrain-deep);
  color: var(--on-strong);
}

.figure-well {
  position: relative;
  height: 15rem;
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr auto;
  border: 1px solid var(--line);
  border-radius: 0.25rem;
  background: var(--paper-soft);
}

.figure-well::before {
  content: "";
  position: absolute;
  inset: 2rem 5% 3.15rem;
  background: var(--funnel-wash);
  border: 1px solid var(--line);
  opacity: 0.55;
}

.figure-well::after {
  content: "";
  position: absolute;
  inset: 2.2rem 5.8% 3.35rem;
  border-block: 1px solid var(--line);
  opacity: 0.6;
  pointer-events: none;
}

.figure-well-label {
  position: relative;
  z-index: 1;
  padding: 0.45rem 0.7rem 0;
  color: var(--ink-soft);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-transform: uppercase;
}

.figure-grid {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.22rem;
  width: min(100%, 68rem);
  min-height: 0;
  margin: 0 auto;
  padding: 0.1rem 0.7rem 0.2rem;
}

.figure-row {
  display: grid;
  grid-template-columns: repeat(20, minmax(0, 1fr));
  gap: clamp(1px, 0.28vw, 4px);
  width: 100%;
  height: 2.1rem;
  align-items: center;
  justify-items: center;
}

.figure-cell {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  transition: opacity 0.28s ease-out;
}

.figure-cell.is-faded { opacity: 0.42; }

.figure-grid svg {
  width: min(1.35rem, 100%);
  height: auto;
  display: block;
  overflow: visible;
}

.figure-grid .fig {
  fill: none;
  stroke: var(--figure-lit);
  stroke-width: 1.4;
  vector-effect: non-scaling-stroke;
  transition: stroke 0.28s ease-out, opacity 0.28s ease-out;
}

.figure-grid .fig.is-dim {
  stroke: var(--figure-dim);
  opacity: 0.75;
}

.abyss {
  position: relative;
  z-index: 2;
  min-height: 3rem;
  padding: 0.5rem 0.7rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.35rem 1rem;
  color: var(--on-abyss);
  background: var(--abyss);
  border-top: 2px solid var(--abyss-edge);
  font-size: 0.82rem;
  line-height: 1.25;
}

.abyss-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.abyss-count { opacity: 0.95; }

.controls {
  flex-wrap: wrap;
}

.scene-readout {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 0.25rem 0.8rem;
  align-items: start;
  border-top: 1px solid var(--line);
  padding-top: 0.55rem;
}

.scene-status {
  margin: 0;
  color: var(--chalk-strong);
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.3;
  white-space: nowrap;
}

.step-caption {
  padding: 0;
  margin: 0;
}

.step-caption p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.35;
}

.step-caption p + p {
  margin-top: 0.15rem;
  color: var(--ink-soft);
}

.data-table-details {
  margin: 0.35rem 0 1.6rem;
  border-block: 1px solid var(--line);
}

.data-table-details summary {
  min-height: 44px;
  display: flex;
  align-items: center;
  padding: 0.5rem 0;
  color: var(--chalk-strong);
  cursor: pointer;
  font-weight: 700;
}

.data-table-details[open] summary { margin-bottom: 0.5rem; }

@media (prefers-reduced-motion: reduce) {
  .figure-cell, .figure-grid .fig { transition: none; }
}

@media (max-width: 62rem) {
  .step-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 35rem) {
  html, body { overflow-x: hidden; }
  .wrap, .site-header .wrap { width: 100%; min-width: 0; }
  .site-header .wrap { align-items: flex-start; }
  .site-brand { flex: 1 1 100%; }
  .header-actions { width: 100%; min-width: 0; }
  h1, .answer, .key-metrics li, .chart-card, .caveat { overflow-wrap: anywhere; }
  button { max-width: 100%; white-space: normal; }
  .key-metrics { grid-template-columns: 1fr; }
  .funnel-scene { padding: 0.6rem; gap: 0.55rem; }
  .step-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.3rem; }
  .step-list button { min-height: 3rem; font-size: 0.75rem; padding-inline: 0.35rem; }
  .figure-well { height: 15.5rem; }
  .figure-grid { padding-inline: 0.25rem; }
  .figure-row { gap: 2px; height: 2rem; }
  .figure-grid svg { width: min(1.05rem, 100%); }
  .controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .controls button { width: 100%; font-size: 0.82rem; padding-inline: 0.35rem; }
  .controls [data-action="prev"] { margin-left: 0; }
  .scene-readout { grid-template-columns: 1fr; gap: 0.2rem; }
  .scene-status { white-space: normal; }
  .abyss { align-items: flex-start; flex-direction: column; gap: 0.1rem; }
}

.chart-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 1rem 0 2rem;
}

@media (min-width: 50rem) {
  .chart-block { grid-template-columns: 3fr 2fr; }
}

.chart-card, .caveat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  padding: 1.25rem;
}

.caveat h3 { margin-top: 0; font-size: 1.1rem; }

.bar-row { margin: 0.9rem 0; }

.bar-row dt { font-size: 1rem; margin-bottom: 0.25rem; }
.bar-row dd { margin: 0; }

.bar {
  background: var(--bar-track);
  border-radius: 0.35rem;
  overflow: hidden;
}

.bar span {
  display: block;
  background: var(--terrain);
  color: var(--on-strong);
  padding: 0.3rem 0.6rem;
  min-height: 44px;
  display: flex;
  align-items: center;
  white-space: nowrap;
}

.bar.compare span { background: var(--chalk-strong); }

.data-table-wrap { overflow-x: auto; margin: 1rem 0 2rem; }

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 1rem;
}

caption { text-align: left; font-weight: 700; padding-bottom: 0.5rem; }

th, td {
  border: 1px solid var(--line);
  padding: 0.6rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

th { background: var(--paper-soft); }

footer.site-footer {
  border-top: 2px solid var(--line);
  margin-top: 3rem;
  padding: 1.5rem 0 3rem;
  color: var(--ink-soft);
  font-size: 1rem;
}

.back-to-top { display: inline-block; margin-top: 1rem; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.scene-status {
  font-size: 1rem;
  color: var(--ink-soft);
}

.scene-error {
  border: 2px solid var(--chalk-strong);
  border-radius: 0.5rem;
  padding: 1rem;
  margin: 1rem 0;
}