:root {
  color-scheme: light;
  font:
    16px/1.5 system-ui,
    sans-serif;
  color: #292b29;
  background: #f3f0e8;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
main {
  max-width: 1050px;
  margin: 48px auto;
  padding: 0 28px;
}
header {
  border-bottom: 1px solid #d7d3c9;
  padding-bottom: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.eyebrow {
  font-size: 12px;
  letter-spacing: 0.18em;
  font-weight: 700;
  text-transform: uppercase;
  color: #7b5144;
}
h1 {
  font-family: Georgia, serif;
  font-size: 48px;
  line-height: 1.1;
  margin: 9px 0 4px;
  font-weight: 500;
}
header p {
  margin: 0;
  color: #6c6f66;
}
.badge {
  border: 1px solid #c9c5b8;
  border-radius: 30px;
  padding: 8px 14px;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 650;
}
.layout {
  display: grid;
  grid-template-columns: minmax(280px, 560px) 1fr;
  gap: 48px;
  margin-top: 32px;
}
.board-wrap {
  position: relative;
}
.columns {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  margin-left: 22px;
  text-align: center;
  color: #77796e;
  font-size: 12px;
  height: 25px;
}
.board-row {
  display: flex;
}
.rows {
  width: 22px;
  display: grid;
  grid-template-rows: repeat(6, 1fr);
  font-size: 12px;
  color: #77796e;
}
.rows span {
  display: flex;
  align-items: center;
}
.board {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 4px;
  padding: 8px;
  background: #dedbcf;
  border-radius: 6px;
  box-shadow: 0 12px 35px #2626220b;
}
.cell {
  aspect-ratio: 1;
  border: 0;
  border-radius: 3px;
  background: #faf8f1;
  position: relative;
  display: grid;
  place-items: center;
  cursor: pointer;
  min-width: 0;
  padding: 0;
  color: #282d2b;
}
.cell:disabled {
  cursor: default;
}
.cell:not(:disabled):hover {
  background: #e6ecde;
}
.cell:focus-visible {
  outline: 3px solid #447556;
  outline-offset: -3px;
}
.cell.last {
  box-shadow: inset 0 0 0 2px #ae694e;
}
.piece {
  border-radius: 50%;
  width: 69%;
  height: 69%;
  display: grid;
  place-items: center;
  font-size: clamp(18px, 3vw, 27px);
  font-weight: 450;
  box-shadow: 0 3px 5px #0002;
}
.piece.x {
  background: #303a33;
  color: #fff;
}
.piece.o {
  background: #b65e47;
  color: #fff;
}
.legend {
  margin: 16px 0 0 22px;
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: #686c63;
}
h2 {
  font-size: 25px;
  line-height: 1.25;
  font-weight: 500;
  margin: 12px 0;
}
#detail {
  color: #64685e;
  min-height: 70px;
}
#bound {
  font-size: 13px;
  color: #477051;
  font-weight: 600;
  margin: 14px 0;
}
.new {
  font: inherit;
  background: #303a33;
  color: white;
  border: 0;
  border-radius: 4px;
  padding: 11px 24px;
  cursor: pointer;
}
.new:disabled {
  opacity: 0.4;
  cursor: default;
}
.new:focus-visible {
  outline: 3px solid #ae694e;
  outline-offset: 3px;
}
.info {
  border-top: 1px solid #d7d3c9;
  margin-top: 25px;
  padding-top: 18px;
}
h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin: 0 0 8px;
}
.info p {
  font-size: 13px;
  color: #686c63;
  margin: 0;
}
#history {
  font-size: 13px;
  max-height: 140px;
  overflow: auto;
  line-height: 1.9;
  color: #5b6057;
}
.error {
  color: #a23426;
  min-height: 24px;
  font-size: 13px;
  margin-top: 12px;
}
.note {
  font-size: 12px;
  color: #7b5144;
  margin: 16px 0 0 22px;
}
footer {
  border-top: 1px solid #d7d3c9;
  margin-top: 35px;
  padding-top: 16px;
  color: #797c72;
  font-size: 12px;
}
@media (max-width: 760px) {
  main {
    margin: 24px auto;
    padding: 0 18px;
  }
  .layout {
    grid-template-columns: 1fr;
    gap: 24px;
    max-width: 560px;
    margin-inline: auto;
  }
  h1 {
    font-size: 38px;
  }
  header {
    align-items: flex-start;
  }
  .badge {
    font-size: 10px;
    padding: 7px 10px;
  }
  #detail {
    min-height: 0;
  }
  .piece {
    font-size: 25px;
  }
  footer {
    margin-top: 24px;
  }
}

.header-tools {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}
.theme-toggle {
  font: inherit;
  font-size: 12px;
  cursor: pointer;
  padding: 6px 12px;
  border: 1px solid #c9c5b8;
  border-radius: 30px;
  background: transparent;
  color: inherit;
  white-space: nowrap;
}
.theme-toggle:hover {
  background: #dedbcf;
}
.theme-toggle:focus-visible {
  outline: 3px solid #447556;
  outline-offset: 3px;
}
:root[data-theme='dark'] {
  color-scheme: dark;
  color: #e6e8df;
  background: #171c19;
}
[data-theme='dark'] header,
[data-theme='dark'] .info,
[data-theme='dark'] footer {
  border-color: #39423a;
}
[data-theme='dark'] .eyebrow,
[data-theme='dark'] .note {
  color: #dba48b;
}
[data-theme='dark'] header p,
[data-theme='dark'] #detail,
[data-theme='dark'] .legend,
[data-theme='dark'] .info p,
[data-theme='dark'] #history {
  color: #b1b9ac;
}
[data-theme='dark'] .badge,
[data-theme='dark'] .theme-toggle {
  border-color: #515c50;
}
[data-theme='dark'] .theme-toggle:hover {
  background: #333e34;
}
[data-theme='dark'] .columns,
[data-theme='dark'] .rows,
[data-theme='dark'] footer {
  color: #a0ab9b;
}
[data-theme='dark'] .board {
  background: #394438;
  box-shadow: 0 12px 35px #0003;
}
[data-theme='dark'] .cell {
  background: #242d26;
  color: #e6e8df;
}
[data-theme='dark'] .cell:not(:disabled):hover {
  background: #3b503e;
}
[data-theme='dark'] .cell.last {
  box-shadow: inset 0 0 0 2px #e4ad85;
}
[data-theme='dark'] .piece.x {
  background: #c6d8b9;
  color: #17251b;
}
[data-theme='dark'] .piece.o {
  background: #c77960;
  color: #171c19;
}
[data-theme='dark'] #bound {
  color: #aad49a;
}
[data-theme='dark'] .new {
  background: #bdd4ad;
  color: #19251b;
}
[data-theme='dark'] .error {
  color: #ffac98;
}
[data-theme='dark'] .cell:focus-visible,
[data-theme='dark'] .theme-toggle:focus-visible {
  outline-color: #b4db9f;
}

.mode-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}
.mode-bar label {
  font-size: 13px;
  font-weight: 600;
}
.mode-bar select {
  font: inherit;
  font-size: 14px;
  border: 1px solid #c9c5b8;
  background: #faf8f1;
  color: inherit;
  border-radius: 4px;
  padding: 9px 12px;
  max-width: 100%;
}
.mode-bar span {
  font-size: 12px;
  color: #686c63;
}
.controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.secondary {
  font: inherit;
  padding: 10px 13px;
  border: 1px solid #c9c5b8;
  background: transparent;
  color: inherit;
  border-radius: 4px;
  cursor: pointer;
}
.secondary:disabled {
  opacity: 0.4;
  cursor: default;
}
.secondary:focus-visible,
.mode-bar select:focus-visible {
  outline: 3px solid #447556;
  outline-offset: 2px;
}
[data-theme='dark'] .mode-bar select {
  background: #242d26;
  border-color: #515c50;
}
[data-theme='dark'] .mode-bar span {
  color: #b1b9ac;
}
[data-theme='dark'] .secondary {
  border-color: #515c50;
}
.cell.winning {
  outline: 3px solid #81a96e;
  outline-offset: -5px;
}

.board {
  position: relative;
  isolation: isolate;
}
.board.is-animating .cell .piece {
  visibility: hidden;
}
.motion-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  overflow: hidden;
  border-radius: 6px;
}
.motion-token {
  position: absolute;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  transform: translate(-50%, -50%);
  will-change: transform, opacity;
}
.motion-token .piece {
  width: 100%;
  height: 100%;
}
.motion-land {
  z-index: 2;
  animation: piece-land var(--land-time) cubic-bezier(0.2, 0.75, 0.25, 1.2) both;
}
.motion-push {
  animation: piece-push var(--push-time) var(--push-at)
    cubic-bezier(0.22, 0.7, 0.22, 1) both;
}
.motion-exit {
  animation: piece-exit var(--push-time) var(--push-at)
    cubic-bezier(0.22, 0.7, 0.22, 1) both;
}
.cell.placing {
  animation: placement-ring 1050ms ease-out both;
}
@keyframes piece-land {
  0% {
    opacity: 0;
    transform: translate(-50%, -85%) scale(0.65);
  }
  70% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.06);
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}
@keyframes piece-push {
  from {
    transform: translate(-50%, -50%);
  }
  to {
    transform: translate(
      calc(-50% + var(--push-x)),
      calc(-50% + var(--push-y))
    );
  }
}
@keyframes piece-exit {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  40% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate(calc(-50% + var(--push-x)), calc(-50% + var(--push-y)))
      scale(0.7);
  }
}
@keyframes placement-ring {
  0% {
    box-shadow: inset 0 0 0 2px #dba48b00;
  }
  35% {
    box-shadow: inset 0 0 0 3px #dba48bcc;
  }
  100% {
    box-shadow: inset 0 0 0 2px #dba48b00;
  }
}
@media (prefers-reduced-motion: reduce) {
  .motion-token,
  .cell.placing {
    animation: none;
    will-change: auto;
  }
}

.credits {
  margin: 10px 0 0;
}
.credits a {
  color: inherit;
  text-underline-offset: 3px;
}
.credits a:hover {
  color: #ae694e;
}