/* Game of Life (2014 archive): a nod to Martin Gardner's "Mathematical Games"
   column. Newsprint, black ink, crisp rules. Everything is scoped under
   .arc-life so nothing leaks to other pages. */

html:has(.arc-life),
body:has(.arc-life) {
  margin: 0;
  padding: 0;
  background: #f1eee6;
  color: #141414;
  color-scheme: light;
}

.arc-life {
  --paper: #f1eee6;
  --paper-card: #f7f5f3;
  --ink: #141414;
  --ink-soft: #4a4740;
  --rule: #c9c3b5;
  --red: #b3261e;
  --serif: Georgia, "Times New Roman", ui-serif, serif;
  --display: Charter, Georgia, ui-serif, serif;

  min-height: 100svh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

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

.arc-life a {
  color: inherit;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
}

.arc-life a:hover {
  text-decoration-color: currentColor;
}

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

.arc-life-bar,
.arc-life-masthead,
.arc-life-board,
.arc-life-article,
.arc-life-footer {
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
}

/* Top bar */

.arc-life-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 6px 32px;
}

.arc-life-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  font-family: var(--display);
  font-size: 13px;
  font-weight: bold;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none !important;
}

.arc-life-home:hover {
  color: var(--red);
}

.arc-life-archive {
  margin: 0;
  font-size: 14px;
  font-style: italic;
  color: var(--ink-soft);
}

/* Masthead: the column's department head over a thick and thin rule */

.arc-life-masthead {
  margin: 0 32px;
  padding: 18px 0 22px;
  border-top: 4px solid var(--ink);
  text-align: center;
  position: relative;
}

.arc-life-masthead::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 3px;
  border-top: 1px solid var(--ink);
}

@media (min-width: 1305px) {
  .arc-life-masthead {
    margin-left: auto;
    margin-right: auto;
    max-width: 1176px;
  }
}

.arc-life-department {
  display: flex;
  align-items: center;
  gap: 18px;
  margin: 0 0 10px;
  font-family: var(--display);
  font-size: 14px;
  font-weight: bold;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}

.arc-life-department::before,
.arc-life-department::after {
  content: "";
  flex: 1;
  border-top: 1px solid var(--ink);
}

.arc-life-masthead h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: bold;
  font-size: 56px;
  line-height: 1.05;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.arc-life-dek {
  max-width: 720px;
  margin: 12px auto 0;
  font-size: 18px;
  line-height: 1.5;
  font-style: italic;
  color: var(--ink-soft);
}

.arc-life-dateline {
  margin: 14px 0 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* The board: control panel on top, grid beneath. This is the controller
   element; it sizes the canvas from its clientWidth, so it may carry a
   border but must not carry padding. */

.arc-life-board {
  position: relative;
  margin: 0 32px;
  padding: 0;
  border: 2px solid var(--ink);
  background: var(--paper-card);
}

@media (min-width: 1305px) {
  .arc-life-board {
    margin-left: auto;
    margin-right: auto;
    max-width: 1176px;
  }
}

.arc-life-board canvas {
  display: block;
  width: 100%;
}

.arc-life-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  border-bottom: 2px solid var(--ink);
  background: var(--paper);
}

.arc-life-group {
  padding: 12px 18px 14px;
}

.arc-life-group + .arc-life-group {
  border-left: 1px solid var(--ink);
}

.arc-life-label {
  margin: 0 0 8px;
  font-family: var(--display);
  font-size: 11px;
  font-weight: bold;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.arc-life-label span {
  color: var(--red);
  margin-right: 4px;
}

.arc-life-patterns {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}

.arc-life-speeds {
  display: grid;
  grid-template-columns: repeat(3, auto);
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}

.arc-life .arc-life-chip {
  appearance: none;
  min-height: 40px;
  margin: 0;
  padding: 6px 10px;
  border: 0;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
  background: var(--paper-card);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 14px;
  line-height: 1.2;
  white-space: nowrap;
  cursor: pointer;
}

.arc-life .arc-life-chip:hover {
  background: #e6e1d4;
}

.arc-life .arc-life-chip.active {
  background: var(--ink);
  color: var(--paper);
}

.arc-life .arc-life-chip:focus-visible {
  position: relative;
  z-index: 1;
  outline-offset: -4px;
  outline-color: var(--red);
}

.arc-life .arc-life-chip.active:focus-visible {
  outline-color: var(--paper);
}

.arc-life-run {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 140px;
}

.arc-life .arc-life-go {
  appearance: none;
  width: 100%;
  min-height: 41px;
  margin: 0;
  padding: 8px 18px;
  border: 1px solid var(--red);
  border-radius: 0;
  background: var(--red);
  color: #fff;
  font-family: var(--display);
  font-size: 14px;
  font-weight: bold;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
}

.arc-life .arc-life-go:hover {
  background: #8f1d17;
  border-color: #8f1d17;
}

.arc-life .arc-life-go-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}

.arc-life .arc-life-go-secondary:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.arc-life-metrics {
  position: absolute;
  right: 0;
  bottom: 0;
  padding: 5px 10px;
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
  background: var(--paper);
  font-family: ui-monospace, Menlo, monospace;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.arc-life-metrics:empty {
  display: none;
}

/* Article: a two-column magazine page */

.arc-life-article {
  padding: 48px 32px 0;
}

.arc-life-columns {
  display: grid;
  grid-template-columns: minmax(0, 680px) minmax(0, 360px);
  justify-content: space-between;
  column-gap: 56px;
  max-width: 1176px;
  margin: 0 auto;
  font-size: 18px;
  line-height: 1.6;
  hyphens: auto;
  text-align: justify;
}

.arc-life-columns p {
  margin: 0 0 1em;
}

.arc-life-lede::first-letter {
  float: left;
  margin: 0.06em 0.1em 0 0;
  font-family: var(--display);
  font-weight: bold;
  font-size: 3.5em;
  line-height: 0.8;
}

.arc-life-columns h2 {
  margin: 1.4em 0 0.5em;
  font-family: var(--display);
  font-size: 13px;
  font-weight: bold;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-align: left;
  break-after: avoid;
}

.arc-life-columns h2:first-child {
  margin-top: 0;
}

.arc-life-columns cite {
  font-style: italic;
}

.arc-life-columns > * {
  grid-column: 1;
}

.arc-life-columns > .arc-life-box {
  grid-column: 2;
  grid-row: 1 / span 10;
  align-self: start;
  position: sticky;
  top: 24px;
  margin-top: 0;
}

.arc-life-box {
  margin: 0.4em 0 1.4em;
  padding: 16px 18px 6px;
  border: 2px solid var(--ink);
  background: var(--paper-card);
  font-size: 16px;
  text-align: left;
  hyphens: manual;
}

.arc-life-box h2 {
  margin-top: 0;
}

.arc-life-box ol {
  margin: 0 0 1em;
  padding: 0;
  list-style: none;
  counter-reset: law;
}

.arc-life-box li {
  position: relative;
  padding: 8px 0 8px 30px;
  border-top: 1px solid var(--rule);
  counter-increment: law;
}

.arc-life-box li:last-child {
  border-bottom: 1px solid var(--rule);
}

.arc-life-box li::before {
  content: counter(law) ".";
  position: absolute;
  left: 0;
  font-family: var(--display);
  font-weight: bold;
  color: var(--red);
}

.arc-life-taxonomy {
  margin: 0 0 1em;
  padding: 0;
  list-style: none;
}

.arc-life-taxonomy li {
  position: relative;
  margin: 0 0 0.7em;
  padding-left: 20px;
}

.arc-life-taxonomy li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.55em;
  width: 7px;
  height: 7px;
  background: var(--ink);
}

/* Footer */

.arc-life-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  margin: 40px 32px 0;
  padding: 10px 0 36px;
  border-top: 4px double var(--ink);
  font-size: 15px;
}

@media (min-width: 1305px) {
  .arc-life-footer {
    margin-left: auto;
    margin-right: auto;
    max-width: 1176px;
  }
}

.arc-life-footer p {
  margin: 0;
  font-style: italic;
}

.arc-life-footer p a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

/* Tablet and below */

@media (max-width: 1000px) {
  .arc-life-panel {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .arc-life-group-patterns {
    grid-column: 1 / -1;
    border-bottom: 1px solid var(--ink);
  }

  .arc-life-group-patterns + .arc-life-group {
    border-left: 0;
  }

  .arc-life-run {
    flex-direction: row;
  }
}

@media (max-width: 900px) {
  .arc-life-columns {
    display: block;
    max-width: 680px;
    text-align: left;
  }

  .arc-life-columns > .arc-life-box {
    position: static;
    margin-top: 0.4em;
  }
}

@media (max-width: 640px) {
  .arc-life-bar {
    padding: 4px 16px;
  }

  .arc-life-home {
    font-size: 12px;
    letter-spacing: 0.08em;
  }

  .arc-life-archive {
    font-size: 13px;
    text-align: right;
  }

  .arc-life-masthead,
  .arc-life-board,
  .arc-life-footer {
    margin-left: 16px;
    margin-right: 16px;
  }

  .arc-life-department {
    font-size: 12px;
    letter-spacing: 0.24em;
    gap: 12px;
  }

  .arc-life-masthead h1 {
    font-size: 34px;
  }

  .arc-life-dek {
    font-size: 16px;
  }

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

  .arc-life-group {
    padding: 10px 12px 12px;
  }

  .arc-life-group + .arc-life-group {
    border-left: 0;
    border-top: 1px solid var(--ink);
  }

  .arc-life-group-patterns {
    border-bottom: 0;
  }

  .arc-life-patterns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .arc-life-speeds {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .arc-life .arc-life-chip {
    padding: 6px 4px;
    font-size: 14px;
  }

  .arc-life-run {
    min-width: 0;
  }

  .arc-life-article {
    padding: 36px 16px 0;
  }

  .arc-life-columns {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .arc-life * {
    transition: none !important;
  }
}