/* Elementary Cellular Automata (archive, 2014).
   A print monograph set in Swiss style: white page, true black, hairlines,
   and one loud element, the rule number. Everything is scoped to .arc-eca. */

html:has(.arc-eca),
body:has(.arc-eca) {
  margin: 0;
  background: #fff;
  color: #000;
  color-scheme: light;
}

.arc-eca {
  --ink: #000;
  --paper: #fff;
  --mute: #6f6f6f;
  --faint: #a3a3a3;
  --hair: #e3e3e3;
  --g: clamp(16px, 3vw, 40px);
  --sans: "Helvetica Neue", Helvetica, Arial, ui-sans-serif, system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

.arc-eca *,
.arc-eca *::before,
.arc-eca *::after {
  box-sizing: border-box;
}

.arc-eca a {
  color: inherit;
}

.arc-eca :focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.arc-eca-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* Masthead. Exactly 44px tall: the controller reserves 44px above the canvas. */
.arc-eca-mast {
  height: 44px;
  margin: 0 var(--g);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--ink);
  font-size: 13px;
  line-height: 1;
}

.arc-eca-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  font-weight: 500;
  text-decoration: none;
  letter-spacing: 0.01em;
}

.arc-eca-home:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.arc-eca-archive {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--mute);
  letter-spacing: 0.01em;
}

.arc-eca-archive b {
  color: var(--ink);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* Simulation. The controller sizes the canvas to this element's clientWidth,
   so it carries margins only, never padding. */
.arc-eca-sim {
  margin: 0 var(--g);
}

.arc-eca-stage {
  position: relative;
  border-bottom: 1px solid var(--ink);
}

.arc-eca-canvas {
  display: block;
  max-width: 100%;
  background: var(--paper);
}

.arc-eca-zoom {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
}

.arc-eca-zoom a {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--paper);
  border: 1px solid var(--ink);
  font-size: 20px;
  font-weight: 400;
  line-height: 1;
  text-decoration: none;
}

.arc-eca-zoom a + a {
  border-left: 0;
}

.arc-eca-zoom a:hover {
  background: var(--ink);
  color: var(--paper);
}

/* Panel: rule number, lookup table, index. */
.arc-eca-panel {
  display: grid;
  grid-template-columns: 250px minmax(330px, 360px) minmax(0, 1fr);
  padding: 18px 0 20px;
}

.arc-eca-panel > * {
  min-width: 0;
}

.arc-eca-rule {
  padding-right: 24px;
}

.arc-eca-title {
  margin: 0 0 18px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.005em;
}

.arc-eca-label {
  margin: 0;
  font-size: 13px;
  color: var(--mute);
}

.arc-eca-number {
  margin: 4px 0 0 -0.04em;
  font-size: 148px;
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.065em;
  font-variant-numeric: tabular-nums;
}

.arc-eca-table {
  margin: 0;
  padding: 0 24px;
  border-left: 1px solid var(--hair);
}

.arc-eca-cases {
  list-style: none;
  margin: 0;
  padding: 2px 0 0;
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 6px;
}

.arc-eca-case {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.arc-eca-in {
  display: inline-flex;
}

.arc-eca-in i,
.arc-eca-out {
  display: block;
  width: 11px;
  height: 11px;
  border: 1px solid var(--ink);
  background: var(--paper);
}

.arc-eca-in i + i {
  margin-left: 2px;
}

.arc-eca-in i.is-on,
.arc-eca-out.is-on {
  background: var(--ink);
}

.arc-eca-bit {
  margin-top: 4px;
  padding-top: 6px;
  width: 100%;
  border-top: 1px solid var(--hair);
  text-align: center;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 400;
}

.arc-eca-table figcaption {
  margin-top: 16px;
  max-width: 34ch;
  font-size: 12px;
  line-height: 1.45;
  color: var(--mute);
}

.arc-eca-index {
  padding-left: 24px;
  border-left: 1px solid var(--hair);
}

.arc-eca-index-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}

.arc-eca-index-head h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.arc-eca-index-head p {
  margin: 0;
  font-size: 12px;
  color: var(--mute);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
  text-align: right;
}

.arc-eca-key {
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--ink);
}

.arc-eca-hint {
  margin-left: 14px;
}

.arc-eca-rules {
  display: grid;
  grid-template-columns: repeat(16, minmax(0, 1fr));
  grid-auto-rows: 16px;
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--hair);
}

.arc-eca-rule-link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
  font-size: 10px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--faint);
  text-decoration: none;
}

.arc-eca-rule-link.is-noteworthy {
  color: var(--ink);
  font-weight: 700;
}

.arc-eca-rule-link.is-noteworthy::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 4px;
  background: var(--ink);
}

.arc-eca-rule-link:hover {
  background: #f1f1f1;
  color: var(--ink);
}

.arc-eca-rule-link.active {
  background: var(--ink);
  color: var(--paper);
}

.arc-eca-rule-link.active::before {
  background: var(--paper);
}

.arc-eca-rule-link:focus-visible {
  z-index: 1;
  outline: 2px solid var(--ink);
  outline-offset: 1px;
}

/* Article */
.arc-eca-article {
  margin: 0 var(--g);
  padding-top: clamp(48px, 7vw, 96px);
  border-top: 1px solid var(--ink);
}

.arc-eca-lede,
.arc-eca-section {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  column-gap: 24px;
}

.arc-eca-lede {
  padding-bottom: clamp(48px, 6vw, 80px);
}

.arc-eca-kicker {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
}

.arc-eca-lede p:last-child {
  margin: 0;
  max-width: 30em;
  font-size: clamp(21px, 2.2vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.012em;
}

.arc-eca-section {
  padding: 28px 0 clamp(40px, 5vw, 64px);
  border-top: 1px solid var(--ink);
}

.arc-eca-section h2 {
  margin: 0 0 20px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.arc-eca-section h2 span {
  display: block;
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--mute);
}

.arc-eca-body {
  max-width: 44em;
  font-size: 17px;
  line-height: 1.6;
}

.arc-eca-body p {
  margin: 0 0 1em;
}

.arc-eca-body p:last-child {
  margin-bottom: 0;
}

.arc-eca-body code {
  font-family: var(--mono);
  font-size: 0.92em;
  letter-spacing: 0.04em;
}

.arc-eca-body sup {
  font-size: 0.65em;
  line-height: 0;
}

.arc-eca-body cite {
  font-style: italic;
}

.arc-eca-combos {
  list-style: none;
  margin: 8px 0 28px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
}

.arc-eca-combos li {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--hair);
  font-size: 15px;
}

.arc-eca-combos li:nth-child(odd) {
  padding-right: 24px;
}

.arc-eca-combos strong {
  font-weight: 500;
}

.arc-eca-combo-n {
  width: 1.4em;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--mute);
}

.arc-eca-combos .arc-eca-in i {
  width: 14px;
  height: 14px;
}

.arc-eca-notables {
  margin: 8px 0 0;
  border-top: 1px solid var(--ink);
}

.arc-eca-notables div {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hair);
}

.arc-eca-notables dt {
  font-size: 34px;
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
}

.arc-eca-notables dd {
  margin: 0;
}

.arc-eca-classes {
  list-style: none;
  margin: 8px 0 28px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.arc-eca-classes li {
  padding-top: 12px;
  border-top: 3px solid var(--ink);
}

.arc-eca-classes span {
  display: block;
  font-size: 15px;
  font-weight: 700;
}

.arc-eca-classes p {
  margin: 8px 0 10px;
  font-size: 15px;
  line-height: 1.45;
}

.arc-eca-classes small {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--mute);
}

/* Footer */
.arc-eca-foot {
  margin: 0 var(--g);
  padding: 20px 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
  border-top: 1px solid var(--ink);
  font-size: 13px;
}

.arc-eca-foot p {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
}

.arc-eca-foot p a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  text-underline-offset: 3px;
}

.arc-eca-foot p span {
  display: inline-flex;
  align-items: center;
  color: var(--mute);
}

/* Mid widths: number and table side by side, the index full width below. */
@media (max-width: 1099px) {
  .arc-eca-panel {
    grid-template-columns: 220px minmax(0, 1fr);
    row-gap: 20px;
  }

  .arc-eca-number {
    font-size: 128px;
  }

  .arc-eca-index {
    grid-column: 1 / -1;
    padding-left: 0;
    border-left: 0;
  }

  .arc-eca-rules {
    grid-template-columns: repeat(32, minmax(0, 1fr));
    grid-auto-rows: 22px;
  }

  .arc-eca-classes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Touch screens get finger-sized index cells in a short scrolling box. */
@media (pointer: coarse), (max-width: 699px) {
  .arc-eca-rules {
    grid-template-columns: repeat(auto-fill, minmax(42px, 1fr));
    grid-auto-rows: 40px;
    max-height: 121px;
    overflow-y: auto;
    overscroll-behavior: contain;
    border-bottom: 1px solid var(--ink);
  }

  .arc-eca-rule-link {
    font-size: 13px;
  }

  .arc-eca-rule-link.is-noteworthy::before {
    width: 5px;
    height: 5px;
  }

  .arc-eca-hint {
    display: none;
  }
}

/* Phones */
@media (max-width: 699px) {
  .arc-eca-panel {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 14px;
    padding: 12px 0 14px;
  }

  .arc-eca-rule {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-areas: "label title" "number title";
    align-items: end;
    column-gap: 16px;
    padding-right: 0;
  }

  .arc-eca-label {
    grid-area: label;
  }

  .arc-eca-number {
    grid-area: number;
    min-width: 2.3ch;
    font-size: 76px;
  }

  .arc-eca-title {
    grid-area: title;
    align-self: end;
    margin: 0 0 2px;
    padding-left: 16px;
    border-left: 1px solid var(--hair);
    font-size: 14px;
  }

  .arc-eca-table {
    padding: 0;
    border-left: 0;
  }

  .arc-eca-table figcaption {
    display: none;
  }

  .arc-eca-bit {
    margin-top: 2px;
    padding-top: 4px;
    font-size: 13px;
  }

  .arc-eca-index-head {
    margin-bottom: 6px;
  }

  .arc-eca-lede,
  .arc-eca-section {
    grid-template-columns: minmax(0, 1fr);
  }

  .arc-eca-kicker {
    margin-bottom: 12px;
  }

  .arc-eca-body {
    font-size: 16px;
  }

  .arc-eca-combos {
    grid-template-columns: minmax(0, 1fr);
  }

  .arc-eca-combos li:nth-child(odd) {
    padding-right: 0;
  }

  .arc-eca-notables div {
    grid-template-columns: 64px minmax(0, 1fr);
  }

  .arc-eca-notables dt {
    font-size: 28px;
  }

  .arc-eca-classes {
    grid-template-columns: minmax(0, 1fr);
  }
}