:root {
  color-scheme: light dark;
  --page: #f4f1e9;
  --surface: #fffdf7;
  --surface-strong: #ebe6d9;
  --ink: #18201d;
  --muted: #5d6762;
  --line: #cfc8b9;
  --primary: #195b50;
  --primary-ink: #f7fffc;
  --accent: #c75b39;
  --accent-soft: #f1d9cc;
  --exact: #1c685c;
  --numerical: #a44d2f;
  --hypothesis: #355d8c;
  --analogy: #67518d;
  --series-volume: #087f8c;
  --series-spectral: #d45d31;
  --series-walk: #6f57a7;
  --low: #2d7f87;
  --mid: #d5b75c;
  --high: #bd4e42;
  --shadow: 0 18px 55px rgb(47 38 20 / 0.10);
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #111614;
    --surface: #19201d;
    --surface-strong: #232c28;
    --ink: #edf3ef;
    --muted: #a9b5af;
    --line: #3b4641;
    --primary: #79c7b8;
    --primary-ink: #0d1a17;
    --accent: #ef906d;
    --accent-soft: #4b2d25;
    --exact: #70cbbb;
    --numerical: #ef9879;
    --hypothesis: #8eb8eb;
    --analogy: #b9a3e2;
    --series-volume: #52c5d0;
    --series-spectral: #f18d68;
    --series-walk: #b9a2e8;
    --low: #45aab3;
    --mid: #d9be69;
    --high: #e07467;
    --shadow: 0 18px 55px rgb(0 0 0 / 0.24);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 0%, color-mix(in srgb, var(--primary) 9%, transparent), transparent 34rem),
    var(--page);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
select,
input[type="text"],
textarea {
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
}

button {
  min-height: 2.65rem;
  padding: 0.58rem 0.95rem;
  cursor: pointer;
  font-weight: 500;
}

button:hover {
  border-color: var(--primary);
}

button.primary {
  color: var(--primary-ink);
  background: var(--primary);
  border-color: var(--primary);
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 65%, transparent);
  outline-offset: 2px;
}

a {
  color: var(--primary);
  text-underline-offset: 0.2em;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3,
strong {
  font-weight: 500;
}

h1 {
  max-width: 10ch;
  margin-bottom: 0.5rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3rem, 9vw, 7.2rem);
  line-height: 0.9;
  letter-spacing: -0.055em;
}

h2 {
  margin-bottom: 0.65rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.85rem, 4vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
}

h3 {
  margin-bottom: 0.35rem;
}

main {
  width: min(100% - 2rem, 1240px);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: 0;
  left: -9999px;
  z-index: 20;
  padding: 0.75rem 1rem;
  color: var(--primary-ink);
  background: var(--primary);
}

.skip-link:focus {
  left: 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(18rem, 0.9fr);
  gap: 2rem 4rem;
  align-items: end;
  min-height: 34rem;
  padding: 5rem 0 3rem;
  border-bottom: 1px solid var(--line);
}

.hero .dek {
  max-width: 36rem;
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(1.1rem, 2.2vw, 1.5rem);
}

.hero-definition {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
  align-content: center;
  padding: 1.4rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 1.1rem;
  box-shadow: var(--shadow);
}

.hero-definition span,
.hero-definition strong {
  padding: 0.35rem 0.55rem;
}

.hero-definition span {
  color: var(--muted);
}

.hero-definition strong {
  color: var(--primary-ink);
  background: var(--primary);
  border-radius: 0.45rem;
}

.hero nav {
  grid-column: 1 / -1;
}

.eyebrow,
.section-kicker {
  margin-bottom: 0.65rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.programme,
.application-map {
  padding: 5rem 0;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(16rem, 0.8fr);
  gap: 2rem 4rem;
  align-items: end;
  margin-bottom: 2rem;
}

.section-heading p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.programme-grid,
.application-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 1rem;
}

.programme-grid article,
.application-grid article {
  min-width: 0;
  padding: 1.5rem;
  background: var(--surface);
}

.programme-grid article > span {
  color: var(--accent);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.6rem;
}

.programme-grid p,
.application-grid p {
  margin-bottom: 0;
  color: var(--muted);
}

.laboratory {
  padding: 2rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 1.4rem;
  box-shadow: var(--shadow);
}

.lab-heading {
  display: flex;
  gap: 1rem 2rem;
  justify-content: space-between;
  align-items: end;
  margin-bottom: 1.5rem;
}

.evidence-legend,
.visual-key,
.profile-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.9rem;
  align-items: center;
}

.evidence {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 0.14rem 0.45rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 0.72rem;
  line-height: 1.35;
  white-space: nowrap;
}

.evidence.exact {
  color: var(--exact);
}

.evidence.numerical {
  color: var(--numerical);
}

.evidence.hypothesis {
  color: var(--hypothesis);
}

.evidence.analogy {
  color: var(--analogy);
}

.controls {
  display: grid;
  grid-template-columns: 1.35fr repeat(4, minmax(8rem, 1fr));
  gap: 1rem;
  align-items: end;
  padding: 1.2rem;
  background: var(--surface-strong);
  border-radius: 0.9rem;
}

.controls label,
.programmer-panel label {
  display: grid;
  gap: 0.4rem;
  min-width: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.controls select,
.controls input[type="text"] {
  width: 100%;
  min-height: 2.55rem;
  padding: 0.55rem 0.65rem;
}

.controls input[type="range"] {
  width: 100%;
  accent-color: var(--primary);
}

.controls output {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.controls .button-group {
  grid-column: 1 / -1;
}

.scenario-line {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.8fr);
  gap: 1rem 2rem;
  align-items: center;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.scenario-line > div {
  display: flex;
  gap: 0.7rem;
  align-items: center;
}

.scenario-line p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.mode {
  padding: 0.25rem 0.55rem;
  color: var(--primary-ink);
  background: var(--primary);
  border-radius: 0.4rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.measurements {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  margin: 1.5rem 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
}

.measurements article {
  min-width: 0;
  padding: 1rem;
  background: var(--surface);
}

.measurements article > div {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: 0.8rem;
}

.measurements strong {
  display: block;
  margin: 0.55rem 0 0.2rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.55rem, 3vw, 2.25rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.measurements small {
  display: block;
  min-height: 2.6em;
  color: var(--muted);
}

.visual-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(20rem, 0.65fr);
  gap: 1.5rem;
}

figure {
  min-width: 0;
  margin: 0;
}

figcaption {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  align-items: end;
  min-height: 3.6rem;
  margin-bottom: 0.6rem;
}

figcaption div:first-child {
  display: grid;
  gap: 0.12rem;
}

figcaption span,
.visual-key,
.profile-legend,
.selection-detail {
  color: var(--muted);
  font-size: 0.8rem;
}

.visual-key span,
.profile-legend button {
  display: inline-flex;
  gap: 0.35rem;
  align-items: center;
}

.visual-key b {
  font-weight: 400;
}

.visual-key i,
.profile-legend i {
  display: inline-block;
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
}

.key-low {
  background: var(--low);
}

.key-mid {
  background: var(--mid);
}

.key-high {
  background: var(--high);
}

.world-wrap,
.profile-wrap {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(color-mix(in srgb, var(--line) 30%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--line) 30%, transparent) 1px, transparent 1px),
    color-mix(in srgb, var(--surface-strong) 38%, transparent);
  background-size: 2rem 2rem;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
}

.world-wrap {
  min-height: 33rem;
}

.profile-wrap {
  min-height: 22rem;
}

#world-view,
#profile-chart {
  display: block;
  width: 100%;
  height: 100%;
}

#world-view {
  min-height: 33rem;
}

#profile-chart {
  min-height: 22rem;
}

#world-view .geometry-edge {
  stroke: color-mix(in srgb, var(--ink) 38%, transparent);
  stroke-width: 1.25;
  vector-effect: non-scaling-stroke;
}

#world-view .geometry-edge.is-strong {
  stroke: var(--primary);
}

#world-view .geometry-face {
  stroke: color-mix(in srgb, var(--ink) 18%, transparent);
  stroke-width: 0.8;
  vector-effect: non-scaling-stroke;
}

#world-view .geometry-node {
  cursor: pointer;
  stroke: var(--surface);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}

#world-view .geometry-node.is-selected {
  stroke: var(--ink);
  stroke-width: 3;
}

.profile-legend {
  margin-top: 0.7rem;
}

.profile-legend button {
  min-height: 2rem;
  padding: 0;
  background: transparent;
  border: 0;
  color: var(--muted);
}

.profile-legend button[aria-pressed="false"] {
  opacity: 0.45;
  text-decoration: line-through;
}

.series-volume {
  background: var(--series-volume);
}

.series-spectral {
  background: var(--series-spectral);
}

.series-walk {
  background: var(--series-walk);
}

.selection-detail {
  min-height: 2.7em;
  margin: 0.65rem 0 0;
}

.tooltip {
  position: absolute;
  z-index: 10;
  max-width: 16rem;
  padding: 0.45rem 0.6rem;
  color: var(--surface);
  background: var(--ink);
  border-radius: 0.45rem;
  font-size: 0.78rem;
  pointer-events: none;
}

.process-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr) auto) minmax(0, 1fr);
  gap: 0.65rem;
  align-items: center;
  margin: 1.5rem 0;
  padding: 1rem;
  background: var(--surface-strong);
  border-radius: 0.8rem;
}

.process-strip > div {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0 0.55rem;
  align-items: center;
}

.process-strip div > span {
  grid-row: 1 / 3;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  color: var(--primary-ink);
  background: var(--primary);
  border-radius: 50%;
}

.process-strip small {
  overflow: hidden;
  color: var(--muted);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.comparison-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(13rem, 0.55fr) minmax(15rem, 0.75fr);
  gap: 1rem 1.5rem;
  align-items: end;
  margin: 1.5rem 0;
  padding: 1.2rem;
  border-block: 1px solid var(--line);
}

.comparison-panel h3 {
  margin-top: 0.55rem;
}

.comparison-panel p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.comparison-controls {
  display: grid;
  gap: 0.45rem;
}

.comparison-controls label {
  color: var(--muted);
  font-size: 0.8rem;
}

.comparison-controls input {
  width: 100%;
  min-height: 2.55rem;
  padding: 0.55rem 0.65rem;
}

.comparison-results {
  margin: 0;
}

.comparison-results div {
  display: flex;
  gap: 0.75rem;
  justify-content: space-between;
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--line);
}

.comparison-results dt {
  color: var(--muted);
  font-size: 0.78rem;
}

.comparison-results dd {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  text-align: right;
}

.comparison-panel > .configuration-status {
  grid-column: 1 / -1;
}

.programmer-panel {
  border-top: 1px solid var(--line);
}

.programmer-panel summary {
  padding: 1rem 0;
  cursor: pointer;
  font-weight: 500;
}

.programmer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(16rem, 0.8fr);
  gap: 1.5rem;
  padding: 0.25rem 0 1rem;
}

.programmer-panel textarea {
  width: 100%;
  padding: 0.8rem;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  line-height: 1.45;
  tab-size: 2;
}

.configuration-status {
  margin: 0.55rem 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.configuration-status.is-error {
  color: var(--high);
}

.run-record {
  margin: 0 0 1rem;
}

.run-record div {
  display: grid;
  grid-template-columns: minmax(7rem, 0.7fr) minmax(0, 1.3fr);
  gap: 0.75rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--line);
}

.run-record dt {
  color: var(--muted);
}

.run-record dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.8rem;
}

.application-grid article {
  display: grid;
  align-content: start;
  gap: 0.35rem;
}

.application-grid article .evidence {
  margin-bottom: 0.35rem;
}

.application-grid article small {
  display: block;
  padding-top: 0.7rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

footer {
  margin-top: 2rem;
  padding: 2rem 0 4rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.noscript {
  padding: 1rem;
  color: var(--high);
  border: 1px solid currentColor;
}

@media (max-width: 1000px) {
  .controls {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .control-wide {
    grid-column: span 2;
  }

  .visual-grid {
    grid-template-columns: 1fr;
  }

  .profile-figure {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.75fr);
    gap: 0 1.25rem;
  }

  .profile-figure figcaption,
  .profile-figure .profile-legend,
  .profile-figure .selection-detail {
    grid-column: 2;
  }

  .profile-figure .profile-wrap {
    grid-row: 1 / 5;
  }
}

@media (max-width: 760px) {
  main {
    width: min(100% - 1rem, 1240px);
  }

  .hero,
  .section-heading,
  .scenario-line,
  .comparison-panel,
  .programmer-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: 0;
    padding-top: 3rem;
  }

  .programme-grid,
  .application-grid {
    grid-template-columns: 1fr;
  }

  .laboratory {
    padding: 1rem;
    border-radius: 0.85rem;
  }

  .lab-heading {
    display: grid;
  }

  .controls {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 0.85rem;
  }

  .control-wide {
    grid-column: 1 / -1;
  }

  .measurements {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .profile-figure {
    display: block;
  }

  .process-strip {
    grid-template-columns: 1fr;
  }

  .process-strip > i {
    transform: rotate(90deg);
    justify-self: center;
  }

  .world-wrap,
  #world-view {
    min-height: 26rem;
  }
}

@media (max-width: 460px) {
  h1 {
    font-size: 3.4rem;
  }

  .controls,
  .measurements {
    grid-template-columns: 1fr;
  }

  .scenario-line > div {
    align-items: flex-start;
  }

  .world-wrap,
  #world-view {
    min-height: 22rem;
  }

  .profile-wrap,
  #profile-chart {
    min-height: 19rem;
  }

  .run-record div {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

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