.dot-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  position: relative;
}

.dot-grid__wrap {
  width: 100%;
  height: 100%;
  position: relative;
}

.dot-grid__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

:root {
  color-scheme: light;
  color: var(--ink);
  background: var(--paper);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  --ink: oklch(22% 0.035 255);
  --heading: oklch(28% 0.08 248);
  --primary: oklch(28% 0.08 248);
  --primary-contrast: oklch(98% 0.018 88);
  --board-frame: oklch(28% 0.08 248);
  --paper: oklch(95% 0.025 78);
  --surface: oklch(99% 0.018 88);
  --line: oklch(83% 0.026 74);
  --panel: oklch(99% 0.018 88 / 0.92);
  --panel-strong: oklch(99% 0.018 88 / 0.96);
  --control-bg: oklch(99% 0.018 88 / 0.92);
  --control-border: oklch(28% 0.08 248 / 0.16);
  --muted: oklch(48% 0.026 250);
  --rule-text: oklch(38% 0.035 250);
  --cell-empty: oklch(100% 0 0 / 0.7);
  --small-board-border: oklch(99% 0.018 88 / 0.4);
  --score-bg: oklch(100% 0 0);
  --draw-bg: oklch(91% 0.012 77);
  --stamp-neutral: oklch(22% 0.035 255 / 0.1);
  --last-outline: oklch(28% 0.08 248 / 0.24);
  --brand: oklch(57% 0.16 164);
  --brand-soft: oklch(92% 0.055 164);
  --player-x: oklch(48% 0.22 31);
  --player-x-strong: oklch(38% 0.19 31);
  --player-x-soft: oklch(91% 0.075 31);
  --player-x-cell: oklch(87% 0.11 31);
  --player-o: oklch(43% 0.2 258);
  --player-o-strong: oklch(33% 0.17 258);
  --player-o-soft: oklch(91% 0.07 258);
  --player-o-cell: oklch(86% 0.105 258);
  --hint: oklch(64% 0.18 146);
  --hint-dot: oklch(64% 0.18 146 / 0.42);
  --hint-dot-size: 18px;
  --hint-soft: oklch(91% 0.06 146);
  --gold: oklch(78% 0.15 82);
  --gold-soft: oklch(95% 0.07 91);
  --blue-soft: oklch(92% 0.045 250);
  --fill-gradient-a: oklch(64% 0.18 146 / 0.12);
  --fill-gradient-b: oklch(48% 0.22 31 / 0.1);
  --fill-dots-opacity: 0.48;
  --shadow: 0 18px 46px oklch(22% 0.035 255 / 0.14);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: oklch(93% 0.025 250);
  --heading: oklch(93% 0.045 250);
  --primary: oklch(60% 0.14 250);
  --primary-contrast: oklch(99% 0.01 250);
  --board-frame: oklch(18% 0.055 250);
  --paper: oklch(15% 0.025 255);
  --surface: oklch(23% 0.032 252);
  --line: oklch(39% 0.035 250);
  --panel: oklch(21% 0.027 255 / 0.9);
  --panel-strong: oklch(24% 0.032 252 / 0.96);
  --control-bg: oklch(24% 0.032 252 / 0.94);
  --control-border: oklch(75% 0.055 250 / 0.2);
  --muted: oklch(74% 0.025 250);
  --rule-text: oklch(86% 0.02 250);
  --cell-empty: oklch(98% 0.01 250 / 0.08);
  --small-board-border: oklch(99% 0.01 250 / 0.1);
  --score-bg: oklch(25% 0.032 252);
  --draw-bg: oklch(31% 0.018 255);
  --stamp-neutral: oklch(93% 0.025 250 / 0.12);
  --last-outline: oklch(90% 0.05 250 / 0.26);
  --brand: oklch(70% 0.15 164);
  --brand-soft: oklch(30% 0.06 164);
  --player-x-strong: oklch(82% 0.16 31);
  --player-x-soft: oklch(28% 0.07 31);
  --player-x-cell: oklch(35% 0.11 31);
  --player-o-strong: oklch(83% 0.13 258);
  --player-o-soft: oklch(29% 0.065 258);
  --player-o-cell: oklch(36% 0.1 258);
  --hint: oklch(75% 0.16 146);
  --hint-dot: oklch(75% 0.16 146 / 0.48);
  --hint-soft: oklch(31% 0.07 146);
  --gold: oklch(82% 0.14 82);
  --gold-soft: oklch(31% 0.075 91);
  --blue-soft: oklch(30% 0.055 250);
  --fill-gradient-a: oklch(55% 0.12 205 / 0.16);
  --fill-gradient-b: oklch(48% 0.15 305 / 0.11);
  --fill-dots-opacity: 0.42;
  --shadow: 0 18px 46px oklch(0% 0 0 / 0.42);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--paper);
}

body {
  min-height: 100%;
  margin: 0;
  background: var(--paper);
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

.app {
  position: relative;
  z-index: 1;
  min-height: 100dvh;
  padding: max(18px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right))
    max(18px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));
}

.app-fill {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background:
    linear-gradient(135deg, var(--fill-gradient-a), transparent 42%),
    linear-gradient(315deg, var(--fill-gradient-b), transparent 46%),
    var(--paper);
}

.app-fill .dot-grid {
  opacity: var(--fill-dots-opacity);
}

.app--home {
  display: grid;
  place-items: center;
}

.home-panel {
  width: min(760px, 100%);
}

.home-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 28px;
}

.home-brand {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 18px;
}

.app-mark,
.game-card__icon,
.game-card__action {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
}

.app-mark {
  width: 72px;
  height: 72px;
  border-radius: 20px;
  color: var(--primary-contrast);
  background: var(--primary);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: var(--heading);
  font-size: 2.25rem;
  line-height: 1.05;
  letter-spacing: 0;
}

.game-list {
  display: grid;
  gap: 14px;
}

.game-card {
  display: flex;
  align-items: center;
  min-height: 110px;
  gap: 16px;
  padding: 18px;
  border: 2px solid var(--line);
  border-radius: 8px;
  color: inherit;
  background: var(--panel);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.game-card--ready {
  border-color: oklch(57% 0.16 164 / 0.5);
}

.game-card--ready:active {
  transform: translateY(1px);
}

.game-card--soon {
  opacity: 0.64;
}

.game-card__icon {
  width: 58px;
  height: 58px;
  border-radius: 8px;
  color: var(--heading);
  background: var(--blue-soft);
}

.game-card--ready .game-card__icon {
  color: oklch(100% 0 0);
  background: var(--brand);
}

.game-card__content {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.game-card__title {
  font-size: 1.2rem;
  font-weight: 850;
}

.game-card__meta {
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.35;
}

.game-card__action {
  width: 48px;
  height: 48px;
  margin-left: auto;
  border-radius: 999px;
  color: oklch(100% 0 0);
  background: var(--player-x);
}

.app--game {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 18px;
}

.game-header {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.game-heading {
  min-width: 0;
}

.game-heading h1 {
  overflow: hidden;
  font-size: 1.55rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  gap: 8px;
}

.icon-button {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 2px solid var(--control-border);
  border-radius: 8px;
  color: var(--heading);
  background: var(--control-bg);
  box-shadow: 0 8px 18px oklch(22% 0.035 255 / 0.08);
  cursor: pointer;
  text-decoration: none;
}

.icon-button:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

.icon-button--active {
  color: var(--primary-contrast);
  border-color: transparent;
  background: var(--primary);
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  align-items: start;
  gap: 18px;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.board-wrap {
  display: grid;
  place-items: center;
  min-width: 0;
}

.ultimate-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: min(100%, 760px, calc(100dvh - 116px));
  aspect-ratio: 1;
  gap: 8px;
  padding: 8px;
  border: 4px solid var(--board-frame);
  border-radius: 8px;
  background: var(--board-frame);
  box-shadow: var(--shadow);
}

.small-board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  min-width: 0;
  min-height: 0;
  padding: 4px;
  border: 2px solid var(--small-board-border);
  border-radius: 6px;
  background: var(--surface);
}

.small-board--active {
  border-color: var(--gold);
  box-shadow: inset 0 0 0 3px oklch(78% 0.15 82 / 0.28);
}

.small-board--x,
.small-board--o,
.small-board--draw {
  overflow: hidden;
}

.small-board--x {
  background: var(--player-x-soft);
}

.small-board--o {
  background: var(--player-o-soft);
}

.small-board--draw {
  background: var(--draw-bg);
}

.small-board--match-line {
  outline: 4px solid var(--gold);
  outline-offset: -6px;
}

.cell {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  border: 0;
  border-radius: 6px;
  color: var(--ink);
  background: var(--cell-empty);
  cursor: pointer;
  font-size: 1.82rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
}

.cell:disabled {
  cursor: default;
}

.cell--x {
  color: var(--player-x-strong);
  background: var(--player-x-cell);
  box-shadow: inset 0 0 0 2px oklch(48% 0.22 31 / 0.24);
}

.cell--o {
  color: var(--player-o-strong);
  background: var(--player-o-cell);
  box-shadow: inset 0 0 0 2px oklch(43% 0.2 258 / 0.24);
}

.cell--legal:not(.cell--x, .cell--o)::after {
  width: var(--hint-dot-size);
  height: var(--hint-dot-size);
  border-radius: 999px;
  background: var(--hint-dot);
  content: "";
}

.cell--suggested:not(.cell--x, .cell--o) {
  outline: 4px solid var(--gold);
  outline-offset: -5px;
  background: var(--gold-soft);
}

.cell--win {
  box-shadow: inset 0 0 0 4px oklch(78% 0.15 82 / 0.8);
}

.cell--last {
  outline: 3px solid var(--last-outline);
  outline-offset: -4px;
}

.board-stamp {
  position: absolute;
  inset: 10px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  color: var(--stamp-neutral);
  font-size: 5rem;
  font-weight: 950;
  line-height: 1;
  pointer-events: none;
}

.small-board--x .board-stamp {
  color: oklch(48% 0.22 31 / 0.34);
}

.small-board--o .board-stamp {
  color: oklch(43% 0.2 258 / 0.34);
}

.side-panel {
  display: grid;
  gap: 12px;
}

.turn-badge,
.rule-panel,
.score-grid {
  border: 2px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
  box-shadow: 0 10px 24px oklch(22% 0.035 255 / 0.08);
}

.turn-badge {
  display: grid;
  gap: 4px;
  padding: 16px;
}

.turn-badge span {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
}

.turn-badge strong {
  color: var(--heading);
  font-size: 1.35rem;
  line-height: 1.1;
}

.turn-badge[data-player="x"] {
  border-color: oklch(48% 0.22 31 / 0.65);
  background: linear-gradient(90deg, var(--player-x-soft), var(--panel-strong));
}

.turn-badge[data-player="o"] {
  border-color: oklch(43% 0.2 258 / 0.65);
  background: linear-gradient(90deg, var(--player-o-soft), var(--panel-strong));
}

.rule-panel {
  padding: 14px 16px;
}

.rule-panel p {
  margin: 0;
  color: var(--rule-text);
  font-size: 1rem;
  line-height: 1.45;
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 12px;
}

.score-dot {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border: 2px solid var(--control-border);
  border-radius: 6px;
  color: var(--muted);
  background: var(--score-bg);
  font-weight: 850;
}

.score-dot--x {
  color: var(--player-x-strong);
  border-color: oklch(48% 0.22 31 / 0.36);
  background: var(--player-x-soft);
}

.score-dot--o {
  color: var(--player-o-strong);
  border-color: oklch(43% 0.2 258 / 0.36);
  background: var(--player-o-soft);
}

.score-dot--draw {
  color: var(--muted);
  background: var(--draw-bg);
}

@media (max-width: 860px) {
  .game-layout {
    grid-template-columns: 1fr;
  }

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

  .score-grid {
    grid-column: 1 / -1;
  }
}

@media (max-width: 620px) {
  .app {
    padding: max(12px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right))
      max(12px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
  }

  .home-title-row {
    align-items: flex-start;
  }

  h1 {
    font-size: 1.8rem;
  }

  .game-card {
    min-height: 96px;
    padding: 14px;
  }

  .game-card__icon,
  .game-card__action {
    width: 46px;
    height: 46px;
  }

  .game-header {
    grid-template-columns: auto 1fr;
  }

  .header-actions {
    grid-column: 1 / -1;
    justify-content: stretch;
  }

  .header-actions .icon-button {
    flex: 1;
  }

  .ultimate-board {
    gap: 5px;
    padding: 5px;
    border-width: 3px;
  }

  .small-board {
    gap: 3px;
    padding: 3px;
  }

  .cell {
    border-radius: 4px;
    font-size: 1rem;
  }

  .board-stamp {
    font-size: 3.2rem;
  }

  .side-panel {
    grid-template-columns: 1fr;
  }
}