.rl-article {
  --rl-ink: #18212f;
  --rl-muted: #5b6675;
  --rl-line: #d7dee8;
  --rl-soft: #f4f7fa;
  --rl-blue: #246bfe;
  --rl-green: #148a4a;
  --rl-red: #c83232;
  --rl-gold: #c47a00;
  max-width: 1320px;
  margin: 0 auto;
  padding: 28px 18px 52px;
  color: var(--rl-ink);
}

.rl-article * {
  box-sizing: border-box;
}

.rl-hero {
  max-width: 840px;
  margin-bottom: 24px;
}

.rl-hero h1 {
  margin: 0 0 12px;
  font-size: clamp(30px, 4.5vw, 46px);
  line-height: 1.08;
  letter-spacing: 0;
}

.rl-hero p,
.rl-intro p,
.rl-section-copy p {
  color: var(--rl-muted);
  font-size: 16px;
  line-height: 1.6;
}

.rl-kicker {
  margin: 0 0 8px;
  color: var(--rl-blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.rl-kicker a {
  color: inherit;
}

.rl-intro {
  max-width: 920px;
  padding: 18px 0 8px;
  border-top: 1px solid var(--rl-line);
}

.rl-takeaway-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.rl-takeaway-grid > div {
  padding: 14px;
  border: 1px solid var(--rl-line);
  border-radius: 8px;
  background: #fff;
}

.rl-takeaway-grid h2 {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.2;
  letter-spacing: 0;
}

.rl-takeaway-grid p {
  margin: 0;
  font-size: 15px;
}

.rl-walkthrough-section {
  display: grid;
  grid-template-columns: minmax(220px, 0.34fr) minmax(720px, 1fr);
  gap: 24px;
  align-items: start;
  margin-top: 36px;
  padding-top: 36px;
  border-top: 1px solid var(--rl-line);
}

.rl-section-copy {
  position: sticky;
  top: 82px;
}

.rl-section-copy h2 {
  margin: 0 0 10px;
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: 0;
}

.rl-workbench-shell {
  display: grid;
  gap: 14px;
}

.rl-workbench-top {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: end;
}

.rl-workbench-top h3 {
  margin: 0;
  font-size: 21px;
  letter-spacing: 0;
}

.rl-status {
  min-width: 160px;
  color: #334155;
  text-align: right;
}

.rl-editor-panel,
.rl-grid-panel,
.rl-control-panel {
  border: 1px solid var(--rl-line);
  border-radius: 8px;
  background: #fff;
}

.rl-editor-panel {
  display: grid;
  gap: 10px;
  padding: 14px;
}

.rl-algorithm-guide,
.rl-api-guide {
  display: grid;
  gap: 8px;
  padding: 12px;
  border-radius: 6px;
}

.rl-algorithm-guide {
  border: 1px solid #d9e4d7;
  background: #f6fbf5;
}

.rl-api-guide {
  border: 1px solid #dce7f7;
  background: #f7faff;
}

.rl-algorithm-guide h4,
.rl-api-guide h4 {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0;
}

.rl-algorithm-guide p,
.rl-api-guide p {
  margin: 0;
  color: var(--rl-muted);
  font-size: 13px;
  line-height: 1.45;
}

.rl-algorithm-guide pre {
  overflow: auto;
  margin: 0;
  padding: 10px;
  border-radius: 6px;
  background: #142018;
  color: #e1f5df;
  font: 13px/1.45 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

.rl-api-guide code {
  color: #1d4ed8;
  font-size: 12px;
}

.rl-editor-head,
.rl-button-row,
.rl-toolbar,
.rl-readouts,
.rl-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.rl-editor-head {
  justify-content: space-between;
}

.rl-editor-head label,
.rl-control-panel label,
.rl-field label {
  color: #334155;
  font-size: 13px;
  font-weight: 700;
}

.rl-editor-select,
.rl-editor {
  width: 100%;
}

.rl-editor {
  min-height: 190px;
  resize: vertical;
  padding: 12px;
  border: 1px solid #c7ced8;
  border-radius: 6px;
  background: #101820;
  color: #dce8f7;
  font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  tab-size: 2;
}

.rl-workbench-layout {
  display: grid;
  grid-template-columns: minmax(420px, 1fr) minmax(290px, 0.68fr);
  gap: 14px;
}

.rl-grid-panel,
.rl-control-panel {
  padding: 14px;
}

.rl-grid-panel {
  display: grid;
  gap: 10px;
}

.rl-canvas {
  width: 100%;
  aspect-ratio: 1;
  border: 1px solid #c7ced8;
  border-radius: 6px;
  background: #fff;
  cursor: crosshair;
  touch-action: none;
}

.rl-chart {
  width: 100%;
  height: 170px;
  border: 1px solid var(--rl-line);
  border-radius: 6px;
  background: #fff;
}

.rl-control-panel {
  display: grid;
  gap: 12px;
  align-content: start;
}

.rl-field {
  display: grid;
  gap: 6px;
}

.rl-slider-grid {
  display: grid;
  gap: 9px;
}

.rl-slider-grid label {
  display: grid;
  grid-template-columns: 78px 1fr;
  gap: 8px;
  align-items: center;
}

.rl-readouts span {
  min-width: 82px;
  color: var(--rl-muted);
  font-size: 12px;
}

.rl-log {
  min-height: 92px;
  max-height: 170px;
  overflow: auto;
  margin: 0;
  padding: 10px;
  border-radius: 6px;
  background: #101820;
  color: #dce8f7;
  font-size: 12px;
  line-height: 1.45;
}

.rl-button,
.rl-select {
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid #c7ced8;
  border-radius: 6px;
  background: #fff;
  color: var(--rl-ink);
  font: inherit;
}

.rl-button {
  cursor: pointer;
}

.rl-button:hover,
.rl-tool.is-active {
  border-color: var(--rl-blue);
  background: #edf4ff;
}

.rl-tool {
  min-width: 68px;
}

.rl-legend {
  color: var(--rl-muted);
  font-size: 13px;
}

.rl-swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-right: 5px;
  border-radius: 999px;
  vertical-align: -2px;
}

.rl-swatch-start {
  background: var(--rl-blue);
}

.rl-swatch-agent {
  background: var(--rl-red);
}

.rl-swatch-goal {
  background: var(--rl-green);
}

.rl-swatch-path {
  background: var(--rl-gold);
}

.rl-final-lab .rl-workbench-layout {
  grid-template-columns: minmax(450px, 1fr) minmax(320px, 0.72fr);
}

@media (max-width: 1020px) {
  .rl-walkthrough-section,
  .rl-workbench-layout,
  .rl-final-lab .rl-workbench-layout,
  .rl-takeaway-grid {
    grid-template-columns: 1fr;
  }

  .rl-section-copy {
    position: static;
  }
}

@media (max-width: 620px) {
  .rl-article {
    padding: 24px 12px 44px;
  }

  .rl-workbench-top,
  .rl-editor-head {
    display: grid;
    grid-template-columns: 1fr;
  }

  .rl-status {
    text-align: left;
  }

  .rl-slider-grid label {
    grid-template-columns: 1fr;
  }
}