:root {
  color-scheme: light;
  --ink: black;
  --muted: #746f67;
  --box: #d9d3c8;
  --rule: red;
  --paper: white;
  --input: #fff;
  --accent: blue;
}

* {
  box-sizing: border-box;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Libertinus Serif", Georgia, serif;
}

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 440px);
  gap: clamp(2rem, 4vw, 4rem);
  width: min(1500px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1rem 0 3rem;
  align-items: start;
}

main > section {
  min-width: 0;
}

h1 {
  width: fit-content;
  margin: 0 0 2rem;
  border-bottom: 1px solid currentColor;
  font-family: "Libertinus Sans", Helvetica, Arial, sans-serif;
  font-size: clamp(1.75rem, 2.5vw, 2.5rem);
  font-weight: 400;
  line-height: 1.08;
}

.stanzas-shell {
  position: relative;
  min-width: 0;
}

.stanzas {
  display: grid;
  grid-template-columns: repeat(var(--stanza-count, 6), max-content);
  gap: 1.25rem;
  max-width: 100%;
  padding: 0.75rem 0 1.25rem 1.5rem;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-gutter: stable;
  -webkit-overflow-scrolling: touch;
}

.stanza {
  min-width: 8.3rem;
}

.stanza:first-child {
  width: 8.3rem;
}

.scroll-hint {
  display: block;
  visibility: hidden;
  width: fit-content;
  margin: 0.3rem 0.4rem 0 auto;
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  pointer-events: none;
}

.stanzas-shell.show-scroll-hint .scroll-hint {
  visibility: visible;
}

.stanza h2 {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.stanza ol {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.stanza output {
  display: block;
  min-height: 2rem;
  padding: 0.25rem 0.45rem;
  overflow-wrap: anywhere;
  font-family: "Libertinus Serif", Georgia, serif;
  font-size: 1.15rem;
  line-height: 1.3;
}

.stanza li.recurrence {
  border-radius: 3px;
  outline: 1px solid var(--accent);
  outline-offset: -1px;
}

.cycle-actions {
  display: flex;
  justify-content: flex-end;
  margin: 0.5rem 0 0 1.5rem;
}

.cycle-status {
  margin: 0;
  color: var(--muted);
  font-family: "Libertinus Serif", Georgia, serif;
  font-size: 1rem;
  font-style: italic;
  line-height: 1.5;
}

.cycle-explanations {
  margin: 0.75rem 0 0 1.5rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.5;
}

.cycle-explanations p {
  margin: 0 0 0.75rem;
}

.cycle-buttons {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex: 0 0 auto;
}

.word-input {
  width: 100%;
  min-height: 2rem;
  padding: 0.25rem 0.45rem;
  border: 1px solid var(--box);
  border-radius: 3px;
  background: var(--input);
  color: var(--ink);
  font: 1.05rem/1.3 "Libertinus Serif", Georgia, serif;
}

.word-input:focus {
  border-color: var(--accent);
  outline: 2px solid color-mix(in srgb, var(--accent) 25%, transparent);
  outline-offset: 1px;
}

.word-row {
  position: relative;
}

.word-control {
  position: absolute;
  right: calc(100% + 0.4rem);
  display: grid;
  place-items: center;
  width: 1.1rem;
  height: 1.1rem;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  font: 1rem/1 Helvetica, Arial, sans-serif;
  cursor: pointer;
}

.word-control:hover,
.word-control:focus-visible {
  background: var(--rule);
  color: var(--ink);
  outline: none;
}

.remove-word {
  top: 50%;
  transform: translateY(-50%);
}

.add-word {
  top: -0.8rem;
  z-index: 1;
}

.add-word-after {
  top: auto;
  bottom: -0.8rem;
}

.word-editor-empty {
  position: relative;
  min-height: 1.1rem;
  list-style: none;
}

.word-editor-empty .add-word {
  top: 0;
}

.diagram {
  position: sticky;
  top: 2rem;
  min-width: 0;
  border-left: 1px solid var(--rule);
  padding-left: clamp(1.5rem, 4vw, 3rem);
}

.diagram h2 {
  margin: 0 0 0.35rem;
  font-family: "Libertinus Serif", Georgia, serif;
  font-size: 1.35rem;
  font-weight: 400;
}

.light-button {
  padding: 0.15rem 0.55rem;
  border: 1px solid var(--box);
  border-radius: 3px;
  background: transparent;
  color: var(--muted);
  font: 0.85rem/1.35 "Libertinus Serif", Georgia, serif;
  cursor: pointer;
}

.light-button:hover,
.light-button:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  outline: 2px solid color-mix(in srgb, var(--accent) 15%, transparent);
  outline-offset: 1px;
}

.light-button:disabled {
  opacity: 0.45;
  cursor: default;
}

.reset-scheme {
  display: block;
  margin: 0 0 1rem;
}

.diagram p {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

.array-fields {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  align-items: baseline;
  column-gap: 0.5rem;
  row-gap: 0.35rem;
  margin-bottom: 0.35rem;
}

.array-fields label {
  font-size: 0.9rem;
  color: var(--muted);
}

.scheme-array,
.path-array {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  margin: 0;
}

.scheme-array {
  color: var(--accent);
  font: 0.8rem "Libertinus Mono", "Courier New", Courier, monospace;
}

.path-array {
  color: var(--ink);
  font: 1rem "Libertinus Serif", Georgia, serif;
}

.scheme-array:hover,
.path-array:hover {
  background: color-mix(in srgb, var(--accent) 3%, transparent);
}

.scheme-array:focus,
.path-array:focus {
  background: color-mix(in srgb, var(--accent) 3%, transparent);
  outline: 2px solid color-mix(in srgb, var(--accent) 18%, transparent);
  outline-offset: 2px;
}

.scheme-array[aria-invalid="true"],
.path-array[aria-invalid="true"] {
  background: color-mix(in srgb, var(--rule) 5%, transparent);
}

.diagram .scheme-error,
.diagram .path-error {
  margin: 0 0 0.45rem;
  color: var(--rule);
  font-size: 0.72rem;
}

.scheme-error:empty,
.path-error:empty {
  display: none;
}

.stanzas.path-selection .word-input,
.stanzas.path-selection output {
  color: transparent;
  caret-color: transparent;
}

.stanzas.path-selection .word-control {
  visibility: hidden;
}

.stanzas.path-selection li.recurrence {
  outline-color: transparent;
}

.stanzas.path-selection .stanza li {
  position: relative;
  min-height: 2rem;
  border-radius: 3px;
  cursor: pointer;
  user-select: none;
}

.stanzas.path-selection .stanza li:hover {
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 35%, transparent);
}

.stanzas.path-selection .stanza:not(:has(.path-selected)) li::after {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: color-mix(in srgb, var(--accent) 3%, transparent);
  content: "";
  pointer-events: none;
  animation: path-slot-pulse 1.3s ease-in-out infinite alternate;
}

.stanzas.path-selection .stanza li:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 25%, transparent);
  outline-offset: 2px;
}

.stanzas.path-selection .stanza li.path-selected {
  box-shadow: inset 0 0 0 1px var(--accent);
}

.stanzas.path-selection .stanza li.path-repeat {
  outline: 1px solid var(--accent);
  outline-offset: -1px;
}

.stanzas.path-selection .stanza li.path-selected .word-input,
.stanzas.path-selection .stanza li.path-selected output {
  color: var(--ink);
}

.path-complete-highlight {
  border-radius: 3px;
  animation: path-highlight-fade 900ms ease-out both;
}

@keyframes path-highlight-fade {
  from {
    box-shadow: inset 0 0 0 1px var(--accent);
  }

  to {
    box-shadow: inset 0 0 0 1px transparent;
  }
}

@keyframes path-slot-pulse {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .stanzas.path-selection .stanza:not(:has(.path-selected)) li::after {
    animation: none;
    opacity: 0.5;
  }

  .path-complete-highlight {
    animation-duration: 1ms;
  }
}

.diagram-container {
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-x: contain;
}

.diagram-svg {
  display: block;
  max-width: none;
  overflow: visible;
}

.diagram-svg text,
.path-card-svg text {
  font-family: "Libertinus Mono", "Courier New", Courier, monospace;
}

.diagram-svg text.rotation-algorithm-number,
.path-card-svg text.rotation-algorithm-number {
  font-family: "Courier New", Courier, monospace;
}

.diagram-svg text.current-next-number {
  font-family: "Libertinus Serif", Georgia, serif;
}

.path-browser {
  grid-column: 1 / -1;
  min-width: 0;
}

.path-browser-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.path-browser h2 {
  margin: 0 0 0.25rem;
  font-size: 1.35rem;
  font-weight: 400;
}

.path-browser-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.45;
}

.path-browser-heading .path-browser-range {
  font-size: 0.72rem;
}

.path-browser-orders {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.72rem;
}

.path-browser-orders .light-button {
  font-size: 0.72rem;
}

.path-order-option {
  display: inline-flex;
}

.path-order-option .light-button {
  border-radius: 0;
}

.path-order-option .light-button:first-child {
  border-radius: 3px 0 0 3px;
}

.path-order-option .light-button:last-child {
  margin-left: -1px;
  border-radius: 0 3px 3px 0;
}

.path-order-direction {
  min-width: 1.65rem;
  padding-right: 0.35rem;
  padding-left: 0.35rem;
}

.path-browser-orders .light-button[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--accent);
  position: relative;
  z-index: 1;
}

.path-browser-scroll {
  height: min(72vh, 48rem);
  padding: 0.2rem 0.3rem 1rem;
  overflow-y: auto;
  overscroll-behavior-y: contain;
  scrollbar-gutter: stable;
}

.path-browser-scroll:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 18%, transparent);
  outline-offset: 2px;
}

.path-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(10.5rem, 1fr));
  gap: 1rem;
}

.path-card {
  min-width: 0;
}

.path-card-button {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  padding: 0.7rem;
  border: 1px solid var(--box);
  border-radius: 4px;
  background: var(--paper);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.path-card-button:hover,
.path-card-button:focus-visible {
  border-color: var(--accent);
  outline: 2px solid color-mix(in srgb, var(--accent) 14%, transparent);
  outline-offset: 1px;
}

.path-card-button[aria-current="true"] {
  border-color: var(--accent);
}

.path-card-scheme {
  display: block;
  min-height: 2.7em;
  margin-bottom: 0.35rem;
  color: var(--accent);
  font: 0.68rem "Libertinus Mono", "Courier New", Courier, monospace;
  overflow-wrap: anywhere;
}

.path-card-path {
  display: block;
  margin-bottom: 0.15rem;
  color: var(--ink);
  font: 0.88rem "Libertinus Serif", Georgia, serif;
  overflow-wrap: anywhere;
}

.path-card-metrics {
  display: block;
  margin: -0.15rem 0 0.35rem;
  color: var(--muted);
  font: 0.68rem/1.35 "Libertinus Serif", Georgia, serif;
}

.path-card-svg {
  display: block;
  width: 100%;
  height: auto;
  margin-top: auto;
}

main.browsing {
  grid-template-columns: minmax(0, 1fr);
  row-gap: 0;
}

main.browsing .editor .stanzas-shell,
main.browsing .editor .cycle-actions,
main.browsing .editor .cycle-explanations,
main.browsing .diagram {
  display: none;
}

@media (max-width: 1100px) {
  main {
    grid-template-columns: 1fr;
  }

  .diagram {
    position: static;
    border-top: 1px solid var(--rule);
    border-left: 0;
    padding-top: 2rem;
    padding-left: 0;
  }
}

@media (max-width: 600px) {
  .stanza {
    min-width: 4.3rem;
  }

  .stanza:first-child {
    width: 4.3rem;
  }
}