:root {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-2: #273549;
  --sunken: rgba(15, 23, 42, 0.55);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #f472b6;
  --accent-soft: rgba(244, 114, 182, 0.16);
  --p0: #f472b6;
  --p0-light: #f9a8d4;
  --p1: #fbbf24;
  --p1-light: #fcd34d;
  --on-color: #0f172a;
  --border: rgba(148, 163, 184, 0.16);
  --border-strong: rgba(148, 163, 184, 0.32);
  --radius: 12px;
  --shadow: 0 14px 34px rgba(2, 6, 23, 0.42), 0 2px 6px rgba(2, 6, 23, 0.32);
  --shadow-soft: 0 6px 18px rgba(2, 6, 23, 0.28);
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --fast: 160ms;
  --slow: 240ms;
  --gutter: 16px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

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

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  background: radial-gradient(1100px 520px at 50% -12%, rgba(244, 114, 182, 0.09), transparent 62%), var(--bg);
  color: var(--text);
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
p {
  margin: 0;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- Page frame ---------- */

.topbar,
.layout,
.footer {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-left: max(var(--gutter), env(safe-area-inset-left));
  padding-right: max(var(--gutter), env(safe-area-inset-right));
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: max(12px, env(safe-area-inset-top));
  padding-bottom: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.logo {
  flex: none;
  width: 30px;
  height: 30px;
}

.brand h1 {
  font-size: clamp(1.05rem, 4.2vw, 1.4rem);
  font-weight: 750;
  line-height: 1.15;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.topbar-actions {
  flex: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer {
  padding-top: 4px;
  padding-bottom: max(14px, env(safe-area-inset-bottom));
  text-align: center;
  font-size: 0.8125rem;
}

.footer a {
  display: inline-block;
  padding: 10px;
  line-height: 20px;
  border-radius: 8px;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--fast) var(--ease);
}

.footer a:hover {
  color: var(--text);
}

.footer a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Buttons ---------- */

.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 44px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition:
    background-color var(--fast) var(--ease),
    border-color var(--fast) var(--ease),
    color var(--fast) var(--ease),
    box-shadow var(--fast) var(--ease),
    transform var(--fast) var(--ease);
}

.btn:hover:not(:disabled) {
  background: var(--surface-2);
  border-color: var(--border-strong);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-accent {
  border-color: transparent;
  background: var(--accent);
  color: var(--on-color);
  box-shadow: 0 6px 18px rgba(244, 114, 182, 0.24);
}

.btn-accent:hover:not(:disabled) {
  border-color: transparent;
  background: var(--p0-light);
}

.btn-ghost {
  background: transparent;
}

.btn-lang {
  padding: 0 12px;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
}

.btn-link {
  min-height: 40px;
  border: 0;
  background: none;
  color: var(--muted);
  font-size: 0.875rem;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.btn-link:hover:not(:disabled) {
  background: none;
  color: var(--text);
}

.icon {
  flex: none;
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- Layout ---------- */

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "scores" "board" "actions" "history" "record";
  align-content: start;
  gap: 14px;
  padding-top: 2px;
  padding-bottom: 20px;
}

.scores {
  grid-area: scores;
}

.board-area {
  grid-area: board;
  min-width: 0;
}

.actions {
  grid-area: actions;
}

.history {
  grid-area: history;
}

.record {
  grid-area: record;
}

@media (min-width: 880px) {
  :root {
    --board-size: clamp(380px, calc(100vh - 152px), 760px);
  }

  @supports (height: 100svh) {
    :root {
      --board-size: clamp(380px, calc(100svh - 152px), 760px);
    }
  }

  .topbar,
  .layout,
  .footer {
    max-width: calc(var(--board-size) + 340px + 32px + 2 * var(--gutter));
  }

  .layout {
    grid-template-columns: minmax(0, 1fr) 340px;
    grid-template-rows: auto auto minmax(0, 1fr) auto;
    grid-template-areas:
      "board scores"
      "board actions"
      "board history"
      "board record";
    column-gap: 32px;
    row-gap: 16px;
    padding-top: 6px;
  }

  .board-area {
    align-self: start;
  }
}

/* ---------- Scores ---------- */

.scores {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.player {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas: "avatar score" "info info";
  align-content: start;
  align-items: center;
  gap: 8px 10px;
  padding: 10px 12px 11px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  transition:
    border-color var(--slow) var(--ease),
    box-shadow var(--slow) var(--ease);
}

.player.active.p0,
.player.winner.p0 {
  border-color: var(--p0);
  box-shadow: inset 0 0 0 1px var(--p0), 0 10px 26px rgba(244, 114, 182, 0.2);
}

.player.active.p1,
.player.winner.p1 {
  border-color: var(--p1);
  box-shadow: inset 0 0 0 1px var(--p1), 0 10px 26px rgba(251, 191, 36, 0.18);
}

.avatar {
  grid-area: avatar;
  position: relative;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: var(--on-color);
  font-size: 0.875rem;
  font-weight: 800;
}

.p0 .avatar {
  background: var(--p0);
}

.p1 .avatar {
  background: var(--p1);
}

.player.active .avatar::after {
  content: "";
  position: absolute;
  inset: -4px;
  border: 2px solid;
  border-radius: 50%;
  animation: ring 1.8s var(--ease) infinite;
}

.player.p0 .avatar::after {
  border-color: var(--p0);
}

.player.p1 .avatar::after {
  border-color: var(--p1);
}

.player-score {
  grid-area: score;
  justify-self: end;
  display: inline-block;
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.p0 .player-score {
  color: var(--p0);
}

.p1 .player-score {
  color: var(--p1);
}

.player-score.bump {
  animation: bump var(--slow) var(--ease);
}

/* The level badge moves under the name when both do not fit on one line. */
.player-info {
  grid-area: info;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 6px;
  min-width: 0;
  white-space: nowrap;
}

.player-name {
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 0.9375rem;
  font-weight: 650;
}

.player-detail {
  flex: none;
  padding: 1px 6px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.14);
  color: var(--muted);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.status {
  grid-column: 1 / -1;
  min-height: 1.45em;
  font-size: 0.9375rem;
  font-weight: 600;
  text-align: center;
}

.status.p0 {
  color: var(--p0-light);
}

.status.p1 {
  color: var(--p1-light);
}

@media (min-width: 880px) {
  .status {
    text-align: left;
  }
}

/* ---------- Board ---------- */

.board-frame {
  position: relative;
  width: min(100%, max(300px, calc(100vh - 150px)));
  width: min(100%, max(300px, calc(100svh - 150px)));
  aspect-ratio: 1 / 1;
  margin-inline: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: radial-gradient(120% 90% at 50% 0%, rgba(244, 114, 182, 0.07), transparent 58%), var(--surface);
  box-shadow: var(--shadow);
  transition: border-color var(--slow) var(--ease);
}

.board-frame[data-turn="0"] {
  border-color: rgba(244, 114, 182, 0.38);
}

.board-frame[data-turn="1"] {
  border-color: rgba(251, 191, 36, 0.34);
}

@media (min-width: 880px) {
  .board-frame {
    width: min(100%, var(--board-size));
  }
}

.board {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  outline: none;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

.board:focus-visible {
  box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
}

.board-svg {
  display: block;
  width: 100%;
  height: 100%;
}

.board-svg.interactive {
  cursor: pointer;
}

.edge {
  stroke: var(--muted);
  stroke-opacity: 0.22;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-dasharray: 0.1 12.4;
  transition: stroke-opacity var(--fast) var(--ease);
}

.edge.drawn {
  stroke-opacity: 1;
  stroke-width: 10;
  stroke-dasharray: none;
}

.edge.p0 {
  stroke: var(--p0);
}

.edge.p1 {
  stroke: var(--p1);
}

.edge.fresh {
  transform-box: fill-box;
  transform-origin: center;
  animation: line-in var(--slow) var(--ease) both;
}

.halo {
  stroke-width: 28;
  stroke-linecap: round;
  opacity: 0;
}

.halo.visible {
  opacity: 0.3;
}

.halo.p0,
.preview.p0 {
  stroke: var(--p0);
}

.halo.p1,
.preview.p1 {
  stroke: var(--p1);
}

.preview {
  stroke-width: 10;
  stroke-linecap: round;
  opacity: 0;
  transition: opacity var(--fast) var(--ease);
}

.preview.visible {
  opacity: 0.55;
}

.dots circle {
  fill: #e2e8f0;
}

.box rect {
  fill: transparent;
  transition: fill-opacity var(--slow) var(--ease);
}

.box.p0 rect {
  fill: var(--p0);
  fill-opacity: 0.17;
}

.box.p1 rect {
  fill: var(--p1);
  fill-opacity: 0.15;
}

.box text {
  font-size: 40px;
  font-weight: 800;
  text-anchor: middle;
  dominant-baseline: central;
}

.box.p0 text {
  fill: var(--p0);
}

.box.p1 text {
  fill: var(--p1);
}

.box.pulse {
  transform-box: fill-box;
  transform-origin: center;
  animation: box-pop 260ms var(--ease) both;
}

.cursor-ring {
  fill: none;
  stroke: var(--text);
  stroke-width: 3;
  stroke-dasharray: 7 6;
  opacity: 0;
}

.cursor-ring.visible {
  opacity: 0.9;
}

/* ---------- Game over ---------- */

.overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  padding: 16px;
  border-radius: inherit;
  background: rgba(15, 23, 42, 0.66);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  animation: fade-in var(--slow) var(--ease);
}

.result-card {
  width: min(100%, 330px);
  padding: 20px 20px 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  text-align: center;
  animation: rise var(--slow) var(--ease);
}

.result-kicker {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.result-title {
  margin-top: 6px;
  font-size: 1.5rem;
  line-height: 1.2;
}

.overlay[data-result="p0"] .result-title {
  color: var(--p0-light);
}

.overlay[data-result="p1"] .result-title {
  color: var(--p1-light);
}

.result-score {
  margin-top: 4px;
  font-size: 2.25rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.result-score .p0 {
  color: var(--p0);
}

.result-score .p1 {
  color: var(--p1);
}

.result-record {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.8125rem;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}

.result-actions .btn {
  flex: 1 1 auto;
}

/* ---------- Actions, history, record ---------- */

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.actions .btn {
  flex: 1 1 0;
}

.hint {
  flex-basis: 100%;
  color: var(--muted);
  font-size: 0.8125rem;
  text-align: center;
}

@media (hover: none), (pointer: coarse) {
  .hint-keys {
    display: none;
  }
}

@media (hover: hover) and (pointer: fine) {
  .hint-touch {
    display: none;
  }
}

@media (min-width: 880px) {
  .hint {
    text-align: left;
  }
}

.card {
  min-width: 0;
  padding: 14px 16px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.card h2 {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.count {
  padding: 1px 8px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.14);
  color: var(--muted);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
}

.empty {
  color: var(--muted);
  font-size: 0.875rem;
}

.history-list {
  /* Contains the visually hidden names, which would otherwise stretch the page. */
  position: relative;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(118px, 1fr));
  align-content: start;
  gap: 3px 8px;
  max-height: 172px;
  margin: 0;
  padding: 0 4px 0 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  list-style: none;
  scrollbar-width: thin;
  scrollbar-color: rgba(148, 163, 184, 0.35) transparent;
}

.history-list.scrolled {
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 20px);
  mask-image: linear-gradient(to bottom, transparent, #000 20px);
}

.move {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 6px;
  border-radius: 8px;
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.move:last-child {
  background: rgba(148, 163, 184, 0.13);
}

.move-no {
  min-width: 2.3em;
  color: var(--muted);
  font-size: 0.75rem;
  text-align: right;
}

.chip {
  flex: none;
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  color: var(--on-color);
  font-size: 0.625rem;
  font-weight: 800;
}

.move.p0 .chip {
  background: var(--p0);
}

.move.p1 .chip {
  background: var(--p1);
}

.move-boxes {
  margin-left: auto;
  font-size: 0.75rem;
  font-weight: 800;
}

.move.p0 .move-boxes {
  color: var(--p0);
}

.move.p1 .move-boxes {
  color: var(--p1);
}

@media (min-width: 880px) {
  .history {
    display: flex;
    flex-direction: column;
    min-height: 0;
  }

  .history-list {
    flex: 1 1 auto;
    min-height: 120px;
    max-height: none;
    contain: size;
  }
}

.record h2 {
  margin-bottom: 10px;
}

.record-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.record-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 6px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: var(--sunken);
}

.record-cell.current {
  border-color: rgba(244, 114, 182, 0.45);
}

.record-level {
  color: var(--muted);
  font-size: 0.75rem;
}

.record-nums {
  font-size: 1rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.record-caption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.75rem;
  text-align: center;
}

/* ---------- Setup dialog ---------- */

.setup {
  width: min(440px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  max-height: calc(100svh - 32px);
  margin: auto;
  padding: 0;
  overflow: auto;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
}

.setup[open] {
  animation: rise var(--slow) var(--ease);
}

.setup::backdrop {
  background: rgba(2, 6, 23, 0.72);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}

.setup-form {
  display: grid;
  gap: 18px;
  padding: 20px;
}

.setup-form h2 {
  font-size: 1.25rem;
}

.field {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
  transition: opacity var(--fast) var(--ease);
}

.field legend {
  margin-bottom: 8px;
  padding: 0;
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 650;
}

.field:disabled {
  opacity: 0.45;
}

.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.option {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
}

.option input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.field:disabled .option input {
  cursor: not-allowed;
}

.option span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  transition:
    background-color var(--fast) var(--ease),
    border-color var(--fast) var(--ease),
    color var(--fast) var(--ease);
}

.option:hover span {
  border-color: var(--border-strong);
}

.option input:checked + span {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: #fbcfe8;
}

.option input:focus-visible + span {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* ---------- Motion ---------- */

@keyframes line-in {
  from {
    opacity: 0.25;
    transform: scale(0.1);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes box-pop {
  0% {
    opacity: 0;
    transform: scale(0.5);
  }

  60% {
    opacity: 1;
    transform: scale(1.08);
  }

  100% {
    transform: scale(1);
  }
}

@keyframes bump {
  40% {
    transform: scale(1.3);
  }
}

@keyframes ring {
  0% {
    opacity: 0.75;
    transform: scale(1);
  }

  100% {
    opacity: 0;
    transform: scale(1.45);
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.98);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
}