:root {
  color-scheme: dark;
  --bg: #101514;
  --panel: #17201d;
  --line: #30413a;
  --text: #e3eae4;
  --muted: #a4b6a9;
  --accent: #c2ed91;
  --gold: #efce8b;
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}
a {
  color: var(--accent);
  text-underline-offset: 4px;
}
button,
input,
textarea {
  font: inherit;
}
button {
  cursor: pointer;
  border: 1px solid #53665a;
  background: #25342c;
  color: var(--text);
  border-radius: 7px;
  padding: 10px 13px;
  min-height: 42px;
}
button:hover {
  background: #334737;
}
button:disabled {
  opacity: 0.42;
  cursor: default;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}
header {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 23px 4vw;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}
.wordmark {
  text-decoration: none;
  letter-spacing: 0.12em;
  font-weight: 750;
}
.wordmark span {
  color: var(--muted);
  font-weight: 400;
}
main {
  max-width: 1600px;
  margin: auto;
  padding: 0 4vw 25px;
}
.intro {
  padding: 45px 0 28px;
  max-width: 770px;
}
.eyebrow {
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--accent);
  font-weight: 700;
}
h1 {
  font-family: Georgia, serif;
  font-weight: 400;
  font-size: clamp(36px, 4vw, 57px);
  letter-spacing: -0.035em;
  margin: 10px 0 15px;
}
p {
  line-height: 1.65;
  color: var(--muted);
  font-size: 14px;
}
h2 {
  font-size: 15px;
  font-weight: 650;
  margin: 0 0 15px;
}
.workspace {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr) 240px;
  gap: 16px;
  align-items: start;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
}
.examples button {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: 1px solid transparent;
  font-size: 13px;
  margin-bottom: 4px;
  padding: 10px;
}
.examples button.active {
  background: #2b3c2e;
  border-color: #65784e;
  color: var(--accent);
}
.quiet {
  font-size: 12px;
}
.lab-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.lab-heading h2 {
  font-size: 20px;
  margin: 9px 0;
}
.badge {
  font-size: 11px;
  padding: 6px 9px;
  border: 1px solid #65784e;
  border-radius: 30px;
  white-space: nowrap;
  color: var(--accent);
}
.badge.blocked {
  color: var(--gold);
  border-color: #786847;
}
.metrics {
  display: flex;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: 22px 0;
}
.metrics > div {
  flex: 1;
  padding: 14px 6px;
}
.metrics strong {
  display: block;
  font-family: Georgia, serif;
  font-size: 27px;
  font-weight: 400;
}
.metrics span {
  font-size: 10px;
  color: var(--muted);
}
#canvas {
  padding: 22px 2px;
  min-height: 210px;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}
.circle {
  flex-shrink: 0;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  border: 1px solid #61776a;
  border-radius: 35px;
  padding: 13px 15px 16px;
  min-width: 84px;
  gap: 10px;
  background: rgba(170, 210, 165, 0.025);
}
.circle .operator {
  font:
    12px ui-monospace,
    monospace;
  color: #b1c2b5;
  letter-spacing: 0.04em;
}
.operands {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}
.circle.ready {
  border-color: #9ec875;
  background: #293a27;
  cursor: pointer;
}
.circle.selected {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}
.circle.ready .operator {
  color: var(--accent);
}
.atom {
  font:
    18px ui-monospace,
    monospace;
  padding: 6px;
  white-space: nowrap;
}
.atom.symbol {
  color: var(--gold);
  font-style: italic;
}
.atom.long-number {
  font-size: 13px;
  white-space: normal;
  overflow-wrap: anywhere;
  max-width: 250px;
}
.pixel-image {
  display: grid;
  gap: 2px;
  padding: 5px;
  background: #0e1510;
  border-radius: 4px;
}
.pixel {
  width: 17px;
  height: 17px;
  border-radius: 2px;
  border: 1px solid #ffffff12;
}
.expression {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  overflow-wrap: anywhere;
}
.expression > span {
  display: block;
  font-size: 9px;
  letter-spacing: 0.13em;
  color: var(--muted);
  margin-bottom: 8px;
}
code {
  font:
    12px ui-monospace,
    monospace;
}
kbd {
  font:
    10px ui-monospace,
    monospace;
  border: 1px solid #60715d;
  padding: 1px 4px;
  border-radius: 3px;
  margin-left: 3px;
  color: var(--muted);
}
.controls,
.tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.primary {
  background: var(--accent);
  color: #172313;
  border-color: var(--accent);
  font-weight: 650;
}
.primary:hover {
  background: #d0f7ab;
}
.primary kbd {
  color: #30422b;
}
.selection {
  font-size: 12px;
  min-height: 20px;
}
#message {
  color: var(--gold);
  font-size: 13px;
  line-height: 1.6;
}
.substitution:not(:empty) {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.substitution label {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-right: 10px;
  font:
    13px ui-monospace,
    monospace;
}
.substitution input {
  width: 100px;
  padding: 9px;
  background: #101b14;
  border: 1px solid #5b6d60;
  border-radius: 4px;
  color: var(--text);
}
.tools button {
  font-size: 12px;
  background: none;
}
#comparison {
  margin-top: 15px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}
table {
  border-collapse: collapse;
  width: 100%;
  margin: 12px 0;
  font-size: 12px;
}
td,
th {
  text-align: left;
  border-bottom: 1px solid var(--line);
  padding: 7px 5px;
}
.history ol {
  padding-left: 22px;
  max-height: 540px;
  overflow: auto;
  margin-bottom: 0;
}
.history li {
  padding: 0 0 15px 5px;
  font-size: 12px;
  color: var(--muted);
  overflow-wrap: anywhere;
}
.history li strong {
  display: block;
  color: var(--text);
  font-size: 12px;
  margin-bottom: 5px;
}
.editor {
  margin-top: 20px;
}
.editor summary {
  cursor: pointer;
  font-size: 14px;
  color: var(--accent);
}
.editor label {
  display: block;
  font-size: 12px;
  margin: 12px 0;
}
.editor textarea {
  display: block;
  width: 100%;
  background: #0f1712;
  color: var(--text);
  border: 1px solid #52675a;
  border-radius: 6px;
  padding: 15px;
  font:
    12px ui-monospace,
    monospace;
  resize: vertical;
  margin-bottom: 14px;
}
footer {
  max-width: 1000px;
  padding: 22px 0;
}
footer p {
  font-size: 12px;
}
footer strong {
  color: var(--text);
}
@media (min-width: 1400px) {
  .workspace {
    grid-template-columns: 250px minmax(0, 1fr) 260px;
  }
}
@media (max-width: 1150px) {
  .workspace {
    grid-template-columns: 210px minmax(0, 1fr);
  }
  .history {
    grid-column: 1/-1;
  }
  .history ol {
    max-height: 230px;
  }
}
@media (max-width: 720px) {
  header {
    padding: 18px 5vw;
    font-size: 11px;
  }
  .wordmark span {
    display: none;
  }
  main {
    padding: 0 4vw 20px;
  }
  .intro {
    padding: 32px 0 20px;
  }
  .workspace {
    display: flex;
    flex-direction: column;
  }
  .panel {
    width: 100%;
    padding: 16px;
  }
  .examples #presets {
    display: flex;
    overflow: auto;
    gap: 6px;
  }
  .examples button {
    min-width: 155px;
    max-width: 170px;
    font-size: 12px;
  }
  .examples .quiet {
    display: none;
  }
  .circle {
    padding: 11px 10px;
    border-radius: 27px;
    gap: 8px;
  }
  .operands {
    gap: 8px;
  }
  .atom {
    font-size: 16px;
    padding: 3px;
  }
  .lab-heading {
    align-items: flex-start;
  }
  .lab-heading h2 {
    font-size: 18px;
  }
  .badge {
    font-size: 10px;
  }
  .metrics span {
    font-size: 9px;
  }
  .controls button {
    font-size: 12px;
  }
  #canvas {
    min-height: 180px;
  }
  .pixel {
    width: 14px;
    height: 14px;
  }
}