:root {
  --bg: #f1f0f4;
  --surface: #fbfafc;
  --ink: #1e1b24;
  --fill: #3a3542;
  --muted: #625d6c;
  --rule: #d6d3dd;
  --road: #e4e1ea;
  --band: #24202b;
  --band-ink: #f6f3f8;
  --ginger: #ee8a2a;
  --on-ginger: #1e1b24;
  --ok: #24935a;
  --no: #d8433a;
  --shade: rgba(30, 27, 36, 0.06);
  --grid: rgba(30, 27, 36, 0.3);

  --font-display: "Fredoka", "Nunito", "Trebuchet MS", sans-serif;
  --font-body: "Nunito", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "DM Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141218;
    --surface: #1c1922;
    --ink: #efecf3;
    --fill: #d6d1de;
    --muted: #a29cad;
    --rule: #302c38;
    --road: #28242f;
    --band: #0d0b10;
    --band-ink: #f6f3f8;
    --ginger: #ff9d45;
    --ok: #4cc983;
    --no: #ff6f63;
    --shade: rgba(239, 236, 243, 0.07);
    --grid: rgba(239, 236, 243, 0.3);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #141218;
  --surface: #1c1922;
  --ink: #efecf3;
  --fill: #d6d1de;
  --muted: #a29cad;
  --rule: #302c38;
  --road: #28242f;
  --band: #0d0b10;
  --band-ink: #f6f3f8;
  --ginger: #ff9d45;
  --ok: #4cc983;
  --no: #ff6f63;
  --shade: rgba(239, 236, 243, 0.07);
  --grid: rgba(239, 236, 243, 0.3);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scrollbar-width: none;
}
html::-webkit-scrollbar {
  display: none;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 var(--font-body);
}

:focus-visible {
  outline: 2px solid var(--ginger);
  outline-offset: 2px;
}

button,
select {
  font: 600 14px/1 var(--font-body);
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--rule);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}
button:hover:not(:disabled),
select:hover {
  border-color: var(--muted);
}
button.primary {
  background: var(--ginger);
  border-color: var(--ginger);
  color: var(--on-ginger);
}
button.primary:hover:not(:disabled) {
  border-color: var(--on-ginger);
}
button:disabled {
  opacity: 0.35;
  cursor: default;
}
button:not(:disabled):active {
  transform: translateY(1px);
}

.sign {
  background: var(--band);
  color: var(--band-ink);
  position: sticky;
  top: 0;
  z-index: 2;
}
.sign-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding-block: 12px 0;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.sign-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font: 600 26px/1 var(--font-display);
}
.brand img {
  width: 30px;
  height: 30px;
  flex: none;
}
.brand-sub {
  font: 400 15px/1 var(--font-body);
  opacity: 0.7;
}

.policy {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
}
.github {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: none;
  border-radius: 50%;
  border: 1px solid color-mix(in srgb, var(--band-ink) 25%, transparent);
  color: var(--band-ink);
  opacity: 0.85;
}
.github:hover {
  opacity: 1;
  border-color: var(--ginger);
  color: var(--ginger);
}
.github svg {
  width: 18px;
  height: 18px;
}
.limit-sign {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--band-ink) 25%, transparent);
  background: color-mix(in srgb, var(--band-ink) 8%, transparent);
  color: var(--band-ink);
  font: 600 15px/1 var(--font-body);
  white-space: nowrap;
}
.limit-sign:hover:not(:disabled) {
  border-color: var(--ginger);
}
.limit-sign[aria-expanded="true"] {
  border-color: var(--ginger);
  background: color-mix(in srgb, var(--ginger) 14%, transparent);
}
.limit-sign .rule b {
  color: var(--ginger);
  font: 600 17px/1 var(--font-display);
}
.limit-sign .edit {
  display: flex;
  align-items: center;
  gap: 5px;
  padding-left: 12px;
  border-left: 1px solid color-mix(in srgb, var(--band-ink) 25%, transparent);
  font-size: 13px;
  opacity: 0.75;
}
.limit-sign:hover .edit {
  opacity: 1;
}
.limit-sign .edit svg {
  width: 14px;
  height: 14px;
}
.policy-pop {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  z-index: 5;
  width: 260px;
  padding: 14px;
  display: grid;
  gap: 12px;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 6px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}
.policy-pop[hidden] {
  display: none;
}
.pop-title {
  margin: 0;
  font-weight: 800;
}
.pop-note {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}
.stepper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.stepper-ctl {
  display: flex;
  align-items: center;
  gap: 6px;
}
.stepper-ctl button {
  width: 32px;
  height: 32px;
  padding: 0;
  font-size: 18px;
}
.stepper-ctl output {
  min-width: 3.5ch;
  text-align: center;
  font: 600 15px/1 var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.steps {
  display: flex;
  align-items: stretch;
  gap: 2px;
  margin-top: 12px;
  overflow-x: auto;
  scrollbar-width: none;
}
.steps button {
  position: relative;
  flex: none;
  display: flex;
  align-items: center;
  gap: 8px;
  border: none;
  border-radius: 0;
  background: transparent;
  color: var(--band-ink);
  opacity: 0.68;
  padding: 8px 12px 13px;
  font-weight: 600;
}
.steps button:hover:not(:disabled) {
  opacity: 1;
}
.steps button .n {
  display: inline-grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  font: 500 11px/1 var(--font-mono);
}
.steps button.group-start {
  margin-left: 17px;
}
.steps button.group-start::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 10px;
  bottom: 15px;
  width: 1px;
  background: var(--band-ink);
  opacity: 0.25;
}
.steps button.active {
  opacity: 1;
}
.steps button.active::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 0;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: var(--ginger);
}
.steps button.active .n {
  background: var(--ginger);
  border-color: var(--ginger);
  color: var(--on-ginger);
}

.page {
  display: grid;
  grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
  gap: 48px;
  max-width: 1240px;
  margin: 0 auto;
  padding-block: 40px 32px;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  align-items: start;
}

.eyebrow {
  margin: 0;
  font: 600 0.875em/1.2 var(--font-body);
  color: var(--muted);
}
h1 {
  font: 600 2.4em/1.05 var(--font-display);
  margin: 0.25em 0 0.35em;
  text-wrap: balance;
}
.lesson {
  font-size: 16px;
}
.lead {
  font-size: 1.125em;
  line-height: 1.5;
  margin: 0 0 0.5em;
  max-width: 34em;
}
.lesson h3 {
  font: 800 0.95em/1.2 var(--font-body);
  color: var(--ink);
  margin: 2em 0 0.7em;
  padding-bottom: 0.5em;
  border-bottom: 1px solid var(--rule);
}
.lesson ol,
.lesson ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45em;
  counter-reset: item;
}
.lesson li {
  position: relative;
  padding-left: 1.6em;
}
.lesson li::before {
  position: absolute;
  left: 0;
  top: 0;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  content: "–";
}
.lesson ol li {
  counter-increment: item;
}
.lesson ol li::before {
  content: counter(item) ".";
}
.lesson ul.pros li::before {
  content: "+";
  color: var(--ok);
  font-weight: 600;
}
.lesson ul.cons li::before {
  content: "−";
  color: var(--no);
  font-weight: 600;
}
.lesson p {
  max-width: 34em;
  margin: 0.8em 0 0;
}
.lesson .legend {
  grid-template-columns: 1fr 1fr;
}
.lesson .legend li::before {
  content: none;
}
.chip {
  position: absolute;
  left: 1px;
  top: 0.45em;
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.stage-area {
  display: grid;
  min-width: 0;
}
.stage-area > .instrument {
  grid-area: 1 / 1;
}
.is-off {
  visibility: hidden;
}

.instrument {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 16px;
  min-width: 0;
}

#stage {
  width: 100%;
  height: 334px;
  display: block;
}

.transport {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 14px;
}
.spacer {
  flex: 1;
}
.readout {
  margin: 12px 0 0;
  font: 400 13px/1.4 var(--font-mono);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.log {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  border-top: 1px solid var(--rule);
  height: 300px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--rule) transparent;
}
.log::-webkit-scrollbar {
  width: 6px;
}
.log::-webkit-scrollbar-thumb {
  background: var(--rule);
  border-radius: 3px;
}
.log li {
  display: grid;
  grid-template-columns: 6.5ch 3.5ch 7.5ch minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px solid var(--rule);
  font: 400 13px/1.45 var(--font-mono);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.log li:first-child {
  color: var(--ink);
}
.log .status {
  font-weight: 600;
}
.log .status.ok {
  color: var(--ok);
}
.log .status.no {
  color: var(--no);
}
.log .status.queued {
  color: var(--on-ginger);
  background: var(--ginger);
  padding: 1px 4px 0;
  border-radius: 3px;
  justify-self: start;
  font-size: 11px;
}
.log li.say {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font: 600 15px/1.45 var(--font-body);
  color: var(--ink);
  padding: 10px 0 9px;
}
.log li.say::before,
.takeaway::before {
  content: "";
  width: 20px;
  height: 20px;
  background: url("cats/cat-ginger.svg") center / contain no-repeat;
}

.patterns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 3px;
  gap: 3px;
}
.patterns button {
  border: none;
  background: transparent;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.patterns button[aria-selected="true"] {
  background: var(--ink);
  color: var(--surface);
}
.pattern-desc {
  color: var(--muted);
  font-size: 15px;
  margin: 12px 0 16px;
}
.compare-table {
  overflow-x: auto;
}
.row {
  display: grid;
  grid-template-columns: 190px minmax(220px, 1fr) 72px 72px 72px 72px;
  gap: 12px;
  align-items: center;
  padding: 9px 0;
  border-bottom: 1px solid var(--rule);
  font: 400 14px/1.3 var(--font-mono);
  font-variant-numeric: tabular-nums;
  min-width: 750px;
}
.row.head {
  font: 600 13px/1.2 var(--font-body);
  color: var(--muted);
}
.row > span:nth-child(n + 3) {
  text-align: right;
}
.row .name {
  font: 600 15px/1.25 var(--font-body);
}
.row canvas {
  width: 100%;
  height: 44px;
  display: block;
}
.row .ok {
  color: var(--ok);
}
.row .no {
  color: var(--no);
}
.row .hot {
  color: var(--no);
  font-weight: 600;
}
.takeaway {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  margin: 14px 0 0;
  font-size: 16px;
  max-width: 44em;
}
.takeaway::before {
  margin-top: 2px;
}
.takeaway p {
  margin: 0 0 8px;
}
.takeaway ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
  font-size: 0.875em;
  color: var(--muted);
}
.takeaway li {
  position: relative;
  padding-left: 16px;
}
.takeaway li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.6em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted);
}
.takeaway li.over {
  color: var(--ink);
}
.takeaway li.over::before {
  background: var(--no);
}
.takeaway li.ok::before {
  background: var(--ok);
}
.takeaway:empty {
  display: none;
}

.pager {
  position: sticky;
  bottom: 0;
  z-index: 2;
  background: var(--bg);
  border-top: 1px solid var(--rule);
}
.pager-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  max-width: 1240px;
  margin: 0 auto;
  padding-block: 12px calc(12px + env(safe-area-inset-bottom, 0px));
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  font: 400 13px/1 var(--font-mono);
  color: var(--muted);
}
.pager-inner > :first-child {
  justify-self: start;
}
.pager-inner > :last-child {
  justify-self: end;
}

@media (max-width: 900px) {
  .page {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding-block: 24px;
  }
  h1 {
    font-size: 32px;
  }
}

@media (max-width: 480px) {
  .brand-sub {
    display: none;
  }
  .brand {
    font-size: 21px;
    white-space: nowrap;
  }
  .sign-top {
    gap: 10px;
  }
  .policy {
    gap: 8px;
  }
  .limit-sign {
    padding: 7px 12px;
    font-size: 13px;
  }
  .limit-sign .rule b {
    font-size: 15px;
  }
  .github {
    width: 34px;
    height: 34px;
  }
  .limit-sign .rule-unit {
    display: none;
  }
  .limit-sign .edit {
    display: none;
  }
  .log li {
    grid-template-columns: 6.5ch 3.5ch minmax(0, 1fr);
  }
  .log li .status {
    grid-column: 3;
  }
  .log li .msg {
    grid-column: 1 / -1;
  }
  .next-label {
    display: none;
  }
}

@media (min-width: 901px) {
  html,
  body {
    height: 100%;
    overflow: hidden;
  }
  body {
    display: flex;
    flex-direction: column;
  }
  .sign,
  .pager {
    flex: none;
    position: static;
  }
  .page {
    flex: 1;
    min-height: 0;
    width: 100%;
    grid-template-rows: minmax(0, 1fr);
    align-items: stretch;
    padding-block: clamp(16px, 3vh, 32px);
  }
  .lesson {
    min-height: 0;
    overflow: hidden;
    font-size: clamp(12px, 1.75vh, 16px);
  }
  .stage-area {
    min-height: 0;
  }
  .instrument {
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
  }
  #stage {
    height: clamp(230px, 40vh, 334px);
  }
  .compare-table {
    overflow-y: hidden;
    flex: none;
  }
  .row {
    padding-block: clamp(2px, 0.6vh, 9px);
  }
  .row canvas {
    height: clamp(24px, 3.8vh, 44px);
  }
  .pattern-desc {
    margin-block: clamp(6px, 1.2vh, 12px) clamp(8px, 1.6vh, 16px);
  }
  .takeaway {
    font-size: clamp(13px, 1.75vh, 16px);
    margin-top: clamp(8px, 1.6vh, 14px);
  }
  #compare .transport {
    margin-top: clamp(8px, 1.5vh, 14px);
  }
  #lab .log {
    flex: 1;
    height: auto;
    min-height: 0;
  }
}