:root {
  font-family: Arial, Helvetica, sans-serif;
  color: #242424;
  background: #f3f2ee;
  font-size: 14px;
  --accent: #ee562f;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
header {
  height: 80px;
  padding: 0 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #ccc;
}
a {
  color: inherit;
}
.wordmark {
  text-decoration: none;
  font-size: 24px;
  letter-spacing: -1px;
  font-weight: 700;
}
.byline {
  display: block;
  font-size: 11px;
  margin-top: 5px;
  color: #666;
}
nav {
  display: flex;
  gap: 8px;
}
nav a {
  text-decoration: none;
  padding: 12px 18px;
  border: 1px solid transparent;
}
nav a.active {
  background: #242424;
  color: white;
}
nav span {
  opacity: 0.65;
  margin-left: 7px;
  font-size: 12px;
}
main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  height: calc(100vh - 80px);
}
#viewport {
  position: relative;
  min-width: 0;
  background: #e6e6e6;
  overflow: hidden;
}
#canvas-container {
  width: 100%;
  height: 100%;
}
canvas {
  display: block;
}
#canvas-caption {
  position: absolute;
  top: 25px;
  left: 28px;
  pointer-events: none;
}
#canvas-caption strong {
  display: block;
  font-size: 16px;
}
#stats {
  display: block;
  font-size: 11px;
  color: #666;
  margin-top: 7px;
  font-variant-numeric: tabular-nums;
}
#view-controls {
  position: absolute;
  bottom: 58px;
  left: 28px;
  display: flex;
  gap: 14px;
  align-items: center;
}
#gesture {
  position: absolute;
  bottom: 20px;
  left: 28px;
  font-size: 11px;
  color: #555;
  pointer-events: none;
}
aside {
  overflow-y: auto;
  padding: 25px 22px;
  border-left: 1px solid #ccc;
}
h1 {
  font-size: 30px;
  letter-spacing: -1px;
  margin: 0 0 7px;
}
h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.3px;
  margin: 0 0 13px;
}
p {
  line-height: 1.55;
}
.section-title > span {
  font-size: 10px;
  text-transform: uppercase;
  color: #777;
  letter-spacing: 1px;
}
#intro {
  font-size: 12px;
  color: #666;
  margin-bottom: 24px;
}
section > section,
aside > section {
  border-top: 1px solid #d2d1cd;
  padding-top: 18px;
  margin-top: 22px;
}
.row {
  display: flex;
  gap: 7px;
  margin-top: 8px;
}
.row > * {
  flex: 1;
  min-width: 0;
}
button,
select {
  font: inherit;
  border: 1px solid #bbb;
  background: transparent;
  border-radius: 0;
  padding: 9px 10px;
  color: #242424;
  cursor: pointer;
  font-size: 12px;
}
button:hover {
  background: #fff;
  border-color: #777;
}
button:disabled {
  opacity: 0.35;
  cursor: default;
}
select {
  width: 100%;
  background: #faf9f6;
}
button.primary {
  display: block;
  width: 100%;
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  font-weight: 700;
  margin-top: 16px;
}
.slider {
  display: grid;
  grid-template-columns: 35px 1fr 50px;
  gap: 8px;
  align-items: center;
  font-size: 12px;
  margin-top: 12px;
}
.slider input[type="range"] {
  width: 100%;
  accent-color: #333;
}
.slider input[type="number"] {
  width: 50px;
  background: #faf9f6;
  border: 1px solid #ccc;
  padding: 4px;
  font: inherit;
  text-align: right;
}
.button-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  margin: 10px 0;
}
.small,
#selection-info {
  font-size: 11px;
  color: #777;
}
.reverse {
  display: block;
  font-size: 12px;
  margin: 13px 0 23px;
}
.reverse input {
  accent-color: var(--accent);
}
#status {
  font-size: 12px;
  border-left: 3px solid var(--accent);
  padding: 12px;
  overflow-wrap: anywhere;
  position: sticky;
  top: 0;
  z-index: 10;
  background: #f3f2ee;
  box-shadow: 0 1px 0 #ccc;
  margin: 0 0 22px;
  line-height: 1.5;
}
footer {
  font-size: 10px;
  color: #777;
  padding: 15px 0;
}
details {
  margin: 18px 0;
  font-size: 12px;
}
summary {
  cursor: pointer;
}
[hidden] {
  display: none !important;
}
@media (max-width: 800px) {
  header {
    height: auto;
    min-height: 90px;
    padding: 15px;
    gap: 10px;
    flex-wrap: wrap;
  }
  main {
    display: block;
    height: auto;
  }
  #viewport {
    height: 60vh;
    min-height: 350px;
  }
  aside {
    border: 0;
    overflow: visible;
  }
  #gesture {
    font-size: 10px;
  }
  nav a {
    padding: 8px;
  }
  nav span {
    display: none;
  }
}

#guide-legend {
  position: absolute;
  left: 28px;
  bottom: 108px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 11px;
  pointer-events: none;
  max-width: calc(100% - 56px);
}
#guide-legend span::before {
  content: "";
  display: inline-block;
  width: 15px;
  height: 2px;
  background: currentColor;
  vertical-align: middle;
  margin-right: 6px;
}
.guide-top {
  color: #0087a8;
}
.guide-base {
  color: #995e23;
}
.guide-axis {
  color: #8342bf;
}
#view-controls {
  flex-wrap: wrap;
}
@media (max-width: 800px) {
  #view-controls {
    gap: 9px;
    font-size: 12px;
  }
}

.slider {
  grid-template-columns: 112px minmax(0, 1fr) 48px;
  gap: 7px;
}
.slider > span {
  font-size: 11px;
  line-height: 1.3;
}
.slider > span small {
  display: block;
  color: #888;
  font-size: 9px;
  margin-top: 2px;
}
.slider.unused {
  opacity: 0.45;
}
.parameter-help {
  font-size: 11px;
  line-height: 1.5;
  color: #666;
  margin: 15px 0;
}
#continue-colouring {
  margin-top: 24px;
}