/* CORE Heat's project page.

   Set like the extension: one face, DIN 1451 Mittelschrift, for everything but code. The page is
   the Karoo's own black and white; colour appears only where CORE Heat itself shows it, in the four
   heat zones and the levels and steps built on them. */

@font-face {
  font-family: "DIN 1451 Mittelschrift";
  src: url("fonts/din-1451-mittelschrift.ttf") format("truetype");
  font-display: swap;
}

:root {
  color-scheme: light;
  --din: "DIN 1451 Mittelschrift", "Bahnschrift", "DIN Alternate", "Arial Narrow", sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --z1: #37CA94;
  --z2: #FFC655;
  --z3: #FFA06A;
  --z4: #F35264;

  /* A Karoo card in its day theme. */
  --paper: #ffffff;
  --ink: #000000;
  --ink-2: #3a3a3a;
  --ink-3: #6b6b6b;
  --rule: #d9d9d9;
  --wash: #f0f0f0;

  --chart-fill: 0.5;
  --chart-edge: rgba(0, 0, 0, 0.5);
  --chart-grid: rgba(0, 0, 0, 0.08);
  --chart-axis: rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: dark) {
  /* And in its night theme. */
  :root {
    color-scheme: dark;
    --paper: #000000;
    --ink: #ffffff;
    --ink-2: #c4c4c4;
    --ink-3: #8e8e8e;
    --rule: #2e2e2e;
    --wash: #171717;

    --chart-fill: 0.46;
    --chart-edge: rgba(255, 255, 255, 0.55);
    --chart-grid: rgba(255, 255, 255, 0.08);
    --chart-axis: rgba(255, 255, 255, 0.35);
  }
}

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 84px;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.55 var(--din);
  -webkit-font-smoothing: antialiased;
  font-synthesis: none;
}

img, svg, canvas { display: block; max-width: 100%; }

p { margin: 0 0 12px; }

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, currentColor 45%, transparent);
  text-underline-offset: 0.2em;
}

a:hover { text-decoration-color: currentColor; }

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
  border-radius: 4px;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 400;
  line-height: 1.1;
  color: var(--ink);
}

/* The face has one weight: emphasis is carried by ink, not by a faked bold. */
strong, b {
  font-weight: 400;
  color: var(--ink);
}

code {
  font: 0.82em/1.4 var(--mono);
  background: var(--wash);
  border-radius: 6px;
  padding: 0.12em 0.4em;
  overflow-wrap: anywhere;
}

.wrap {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: 24px;
}

.skip {
  position: absolute;
  left: 12px;
  top: -64px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
}

.skip:focus { top: 12px; }

/* Header ---------------------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}

/* CORE's four heat zones, in order: the one piece of colour outside the fields themselves. */
.site-header::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--z1) 0 25%, var(--z2) 25% 50%, var(--z3) 50% 75%, var(--z4) 75%);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 60px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 23px;
  line-height: 1;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.brand img { border-radius: 7px; }

.nav { display: flex; gap: 2px; }

.nav a {
  padding: 9px 12px;
  border-radius: 999px;
  color: var(--ink-2);
  text-decoration: none;
  line-height: 1;
}

.nav a:hover { background: var(--wash); color: var(--ink); }

.nav .nav-gh {
  margin-left: 6px;
  box-shadow: inset 0 0 0 1px var(--rule);
  color: var(--ink);
}

/* Hero ------------------------------------------------------------------------------------------ */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  align-items: center;
  gap: 64px;
  padding-block: 80px 104px;
}

.hero h1 {
  margin-bottom: 30px;
  font-size: clamp(76px, 11vw, 150px);
  line-height: 0.84;
  letter-spacing: -0.012em;
}

.lede {
  max-width: 30ch;
  margin-bottom: 18px;
  font-size: clamp(24px, 2.6vw, 30px);
  line-height: 1.22;
  color: var(--ink);
}

.hero-copy > p:not(.lede) {
  max-width: 54ch;
  color: var(--ink-2);
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 34px 0 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 54px;
  padding: 0 24px;
  border-radius: 14px;
  font-size: 20px;
  line-height: 1.1;
  text-decoration: none;
}

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

.button.primary:hover { background: color-mix(in srgb, var(--ink) 80%, var(--paper)); }

.button.secondary {
  box-shadow: inset 0 0 0 1.5px var(--ink);
  color: var(--ink);
}

.button.secondary:hover { background: var(--wash); }

.hero-copy .release {
  margin: 0;
  font-size: 15px;
  color: var(--ink-3);
}

.hero-device {
  display: grid;
  justify-items: center;
  gap: 18px;
  margin: 0;
}

.device {
  width: min(100%, 340px);
  padding: 14px 12px 18px;
  border-radius: 36px;
  background: #1a1a1a;
  box-shadow:
    0 0 0 1px #000000,
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 40px 70px -36px rgba(0, 0, 0, 0.6);
}

.device canvas {
  width: 100%;
  height: auto;
  border-radius: 8px;
  background: #2a2a2a;
}

.hero-device figcaption {
  max-width: 32ch;
  font-size: 15px;
  text-align: center;
  color: var(--ink-3);
}

/* Sections -------------------------------------------------------------------------------------- */

.section {
  padding-block: 96px;
  border-top: 1px solid var(--rule);
}

.section-head {
  max-width: 46rem;
  margin-bottom: 40px;
}

.section-head h2 {
  margin-bottom: 18px;
  font-size: clamp(44px, 5.6vw, 64px);
  line-height: 0.95;
}

.section-head p {
  margin: 0;
  color: var(--ink-2);
}

.two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px;
}

.block h3 {
  margin-bottom: 12px;
  font-size: 30px;
  line-height: 1.05;
}

.block > p {
  max-width: 60ch;
  color: var(--ink-2);
}

/* A Karoo tile on the page: the canvas draws the card, and this its outline, which the JS rounds
   to the card's own corner at whatever size the tile is shown. */
canvas[data-tile="field"],
canvas[data-tile="hud"],
canvas[data-tile="pill"] {
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 0 0 1px var(--rule);
}

/* Preview settings ------------------------------------------------------------------------------ */

.settings {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 32px;
  padding-block: 14px;
  border-block: 1px solid var(--rule);
}

.control {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
}

.control-label { color: var(--ink-3); }

/* The HUD's pill, as a control. */
.seg {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  border-radius: 999px;
  background: var(--wash);
}

.seg label {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  line-height: 1;
  white-space: nowrap;
  color: var(--ink-2);
  cursor: pointer;
}

.seg input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.seg label:hover { color: var(--ink); }

.seg label:has(input:checked) {
  background: var(--ink);
  color: var(--paper);
}

.seg label:has(input:focus-visible) {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-2);
  cursor: pointer;
}

.switch input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.switch .track {
  position: relative;
  flex: none;
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: var(--rule);
  transition: background-color 0.15s;
}

.switch .track::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--paper);
  transition: transform 0.15s;
}

.switch input:checked + .track { background: var(--ink); }
.switch input:checked + .track::after { transform: translateX(18px); }

.switch input:focus-visible + .track {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.example sup {
  margin-left: 0.08em;
  font-size: 0.55em;
  line-height: 0;
  vertical-align: 0.62em;
}

.settings-note {
  max-width: 70ch;
  margin: 14px 0 40px;
  font-size: 15px;
  color: var(--ink-3);
}

/* Fields ---------------------------------------------------------------------------------------- */

.field-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 44px 24px;
}

.tile { margin: 0; }

.tile h3,
.tile h4 {
  margin: 16px 0 4px;
  font-size: 23px;
  line-height: 1.1;
}

.tile p {
  max-width: 42ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.45;
  color: var(--ink-2);
}

.hud-intro {
  max-width: 46rem;
  margin: 80px 0 28px;
}

.hud-intro h3 {
  margin-bottom: 12px;
  font-size: 38px;
  line-height: 1;
}

.hud-intro p {
  margin: 0;
  color: var(--ink-2);
}

.hud-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 44px 24px;
}

/* A half-width tile, at the same scale as the full-width ones beside it. */
.tile canvas.half-tile { width: calc(100% * 238 / 478); }

/* Zones ----------------------------------------------------------------------------------------- */

.zones-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  align-items: start;
  gap: 48px;
}

.chart { margin: 0; }

.chart h3 {
  margin-bottom: 8px;
  font-size: 28px;
}

.chart figcaption p {
  max-width: 60ch;
  color: var(--ink-2);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin: 18px 0 10px;
  padding: 0;
  list-style: none;
  font-size: 15px;
  color: var(--ink-2);
}

.legend li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.legend i,
.readout-zone i {
  flex: none;
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

.chart-wrap { position: relative; }

#zone-chart {
  width: 100%;
  height: auto;
  touch-action: none;
  cursor: crosshair;
  -webkit-user-select: none;
  user-select: none;
}

.zone-area { fill-opacity: var(--chart-fill); }

.zone-edge {
  fill: none;
  stroke: var(--chart-edge);
  stroke-width: 1.25;
}

.grid { stroke: var(--chart-grid); }
.axis { stroke: var(--chart-axis); }

.tick {
  font: 14px var(--din);
  fill: var(--ink-3);
}

.axis-title {
  font: 14px var(--din);
  fill: var(--ink-2);
}

.zone-label {
  font: 18px var(--din);
  fill: var(--ink);
}

.cross {
  stroke: var(--ink-2);
  stroke-width: 1;
  opacity: 0.55;
}

.marker .dot {
  stroke: var(--paper);
  stroke-width: 2.5;
}

.ghost circle {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.5;
  opacity: 0.7;
}

.chart-tip {
  position: absolute;
  z-index: 2;
  display: grid;
  gap: 2px;
  padding: 8px 11px;
  border-radius: 10px;
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  line-height: 1.35;
  white-space: nowrap;
  pointer-events: none;
  transform: translate(-50%, calc(-100% - 14px));
}

.chart-tip[hidden] { display: none; }

.chart-tip strong {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 18px;
  color: inherit;
}

.chart-tip i {
  width: 12px;
  height: 3px;
  border-radius: 2px;
}

.chart-tip span { opacity: 0.75; }

.table-view {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}

.table-view summary {
  color: var(--ink-2);
  cursor: pointer;
}

.table-view table {
  width: 100%;
  margin-top: 10px;
  border-collapse: collapse;
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

.table-view caption {
  padding-bottom: 6px;
  text-align: left;
  color: var(--ink-3);
}

.table-view th,
.table-view td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--rule);
  font-weight: 400;
  text-align: right;
}

.table-view th[scope="row"],
.table-view thead th:first-child { text-align: left; }

.table-view thead th { color: var(--ink-3); }

.zones-side {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 22px;
}

.readout {
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}

.readout p { margin: 0; }

.readout-value {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.readout-label { color: var(--ink-3); }

#hsi-output {
  font-size: 64px;
  line-height: 1;
}

.readout p.readout-zone {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 8px;
  margin-top: 10px;
  color: var(--ink-2);
}

.readout-zone b { font-size: 20px; }

.sliders {
  display: grid;
  gap: 6px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}

/* The reading sits beside its label rather than inside it, so the label names one control. */
.slider-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  color: var(--ink-2);
}

.sliders output {
  font-size: 19px;
  color: var(--ink);
}

.sliders input[type="range"] {
  width: 100%;
  margin: 2px 0 12px;
  accent-color: var(--ink);
}

.sliders input[type="range"]:last-child { margin-bottom: 0; }

/* Load and adaptation --------------------------------------------------------------------------- */

.pill-steps {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.pill-steps li {
  display: grid;
  grid-template-columns: 172px minmax(0, 1fr);
  align-items: center;
  gap: 18px;
}

.pill-steps canvas[data-tile="pill"] { width: 172px; }

.pill-steps span {
  font-size: 15px;
  line-height: 1.35;
  color: var(--ink-3);
}

.pill-steps b {
  display: block;
  font-size: 19px;
  line-height: 1.2;
}

.aside {
  max-width: 76ch;
  margin-top: 56px;
  padding-left: 20px;
  border-left: 3px solid var(--ink);
  color: var(--ink-2);
}

.aside p { margin: 0; }

/* Sensor and FIT -------------------------------------------------------------------------------- */

.facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.facts li {
  padding-top: 18px;
  border-top: 2px solid var(--ink);
}

.facts h3 {
  margin-bottom: 8px;
  font-size: 25px;
  line-height: 1.1;
}

.facts p {
  margin: 0;
  color: var(--ink-2);
}

.fields-list { margin: 0; }

.fields-list dt {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  margin-top: 20px;
}

.fields-list dt:first-child { margin-top: 0; }

.fields-list dd {
  margin: 6px 0 0;
  color: var(--ink-2);
}

/* Install --------------------------------------------------------------------------------------- */

.steps .via {
  margin: 4px 0 0;
  color: var(--ink-3);
}

.steps ol {
  display: grid;
  gap: 16px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  position: relative;
  min-height: 32px;
  padding: 3px 0 0 48px;
  color: var(--ink-2);
  counter-increment: step;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  font-size: 18px;
  line-height: 1;
}

.path-block {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}

.path-block h3 {
  margin-bottom: 14px;
  font-size: 30px;
}

.path {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 6px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.path li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.path li:not(:last-child)::after {
  content: "→";
  color: var(--ink-3);
}

.path span {
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--wash);
  line-height: 1;
}

.path-block > p {
  margin: 0;
  color: var(--ink-2);
}

/* Footer ---------------------------------------------------------------------------------------- */

.site-footer {
  padding-block: 56px 72px;
  border-top: 1px solid var(--rule);
  font-size: 15px;
  color: var(--ink-3);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr 1fr;
  gap: 40px;
}

.footer-grid h2 {
  margin-bottom: 10px;
  font-size: 20px;
}

.footer-grid p { margin: 0 0 10px; }

.footer-grid a { color: inherit; }

.footer-grid p.footer-brand {
  margin-bottom: 14px;
  font-size: 28px;
  line-height: 1;
  color: var(--ink);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  font-size: 17px;
}

.footer-links a { color: var(--ink); }

/* Narrower screens ------------------------------------------------------------------------------ */

@media (max-width: 960px) {
  .zones-layout { grid-template-columns: 1fr; }
  .zones-side { position: static; }
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 48px;
    padding-block: 52px 72px;
  }
  .device { width: min(100%, 300px); }
  .field-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .facts { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .two-col { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 760px) {
  .hud-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .wrap { padding-inline: 16px; }
  .section { padding-block: 64px; }
  .nav a:not(.nav-gh):not([href="#install"]) { display: none; }
  .field-grid { gap: 32px 12px; }
  .tile h3, .tile h4 { margin-top: 12px; font-size: 20px; }
  .tile p { font-size: 15px; }
  .settings { gap: 14px 20px; }
  .pill-steps li { grid-template-columns: 136px minmax(0, 1fr); gap: 14px; }
  .pill-steps canvas[data-tile="pill"] { width: 136px; }
}

@media (max-width: 380px) {
  /* "Field background" is the app's own name for the setting, so it wraps rather than shortens. */
  .seg { border-radius: 12px; }
  .seg label {
    padding: 6px 10px;
    border-radius: 9px;
    line-height: 1.1;
    text-align: center;
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}