:root {
  --color-bg-base: #0A0A0A;
  --color-bg-panel-1: #0F0F10;
  --color-bg-panel-2: #121214;
  --color-line-hair-1: #1E1F22;
  --color-line-hair-2: #24262A;
  --color-text-primary: #E6E7E9;
  --color-text-secondary: #AAAAAF;
  --color-text-muted: #7A7C82;
  --color-accent: #4DA3FF;
  --color-accent-soft: #63AEFF;
  --color-accent-strong: #3E8FE0;
  --color-accent-shadow: rgba(77, 163, 255, 0.25);
  --color-accent-tint: rgba(77, 163, 255, 0.16);
  --color-token-x: #F5F7FF;
  --color-token-x-glow: rgba(229, 233, 255, 0.45);
  --color-token-o: #4DA3FF;
  --color-token-o-glow: rgba(77, 163, 255, 0.5);
  --color-overlay-bg: rgba(10, 10, 10, 0.6);

  --focus-ring: #4DA3FF;

  --font-sans: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Helvetica, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  --cell-size: clamp(72px, 18vmin, 140px);
}

body[data-theme="solar"] {
  --color-bg-base: #FDF6E3;
  --color-bg-panel-1: #F5EEDA;
  --color-bg-panel-2: #F0E6CF;
  --color-line-hair-1: #E0D7C0;
  --color-line-hair-2: #D6CCB4;
  --color-text-primary: #2B2B2B;
  --color-text-secondary: #5C5B55;
  --color-text-muted: #7A7462;
  --color-accent: #FF8C42;
  --color-token-x: #1D3557;
  --color-token-x-glow: rgba(29, 53, 87, 0.35);
  --color-token-o: #FF8C42;
  --color-token-o-glow: rgba(255, 140, 66, 0.4);
  --color-overlay-bg: rgba(253, 246, 227, 0.68);
  --focus-ring: #FF8C42;
  --color-accent-soft: #FF9F63;
  --color-accent-strong: #F0701E;
  --color-accent-shadow: rgba(255, 140, 66, 0.22);
  --color-accent-tint: rgba(255, 140, 66, 0.18);
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--color-bg-base);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 26px;
  font-variant-numeric: tabular-nums;
  transition: background 220ms ease, color 220ms ease;
}
.container {
  position: relative;
  max-width: 720px;
  margin: 8vh auto;
  padding: 32px 24px;
  text-align: center;
  background: var(--color-bg-panel-1);
  border: 1px solid var(--color-line-hair-1);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}
h1 { margin: 0 0 12px; letter-spacing: 0.2px; font-weight: 600; }
.lede { margin: 0 auto 6px; color: var(--color-text-muted); font-size: 14px; }

.game-board {
  position: relative;
  display: inline-grid;
  grid-template-columns: repeat(3, var(--cell-size));
  grid-template-rows: repeat(3, var(--cell-size));
  gap: 8px;
  margin: 24px auto 12px;
  padding: 12px;
  border-radius: 20px;
  background: radial-gradient(circle at top, rgba(255,255,255,0.05), transparent 55%), var(--color-bg-panel-2);
  border: 1px solid var(--color-line-hair-2);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  transition: box-shadow 200ms ease;
}

.game-board.board--x-turn {
  box-shadow: 0 0 24px var(--color-token-x-glow), 0 0 0 1px rgba(255,255,255,0.04) inset;
}
.game-board.board--o-turn {
  box-shadow: 0 0 28px var(--color-token-o-glow), 0 0 0 1px rgba(255,255,255,0.04) inset;
}

.cell {
  position: relative;
  width: var(--cell-size);
  height: var(--cell-size);
  background: linear-gradient(145deg, rgba(255,255,255,0.03), rgba(0,0,0,0.2));
  border: 1px solid var(--color-line-hair-2);
  display: inline-flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  border-radius: 14px;
  transition: transform 160ms cubic-bezier(0.2, 0.8, 0.2, 1), background 160ms cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 160ms;
  outline: none;
  font-family: var(--font-mono);
  font-weight: 600;
  user-select: none;
}

.cell:not(.filled):hover { transform: translateY(-2px); background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(0,0,0,0.18)); }
.cell:active { transform: scale(0.98); }

.cell::before {
  font-size: calc(var(--cell-size) * 0.55);
  line-height: 1;
  letter-spacing: 0.02em;
  text-shadow: 0 10px 25px rgba(0,0,0,0.35);
}

.cell.x::before {
  content: 'X';
  background: linear-gradient(135deg, var(--color-token-x) 10%, rgba(255,255,255,0.95));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 12px 35px var(--color-token-x-glow);
}

.cell.o::before {
  content: 'O';
  background: conic-gradient(from 120deg, rgba(255,255,255,0.9) 0deg, var(--color-token-o) 320deg 360deg);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 12px 35px var(--color-token-o-glow);
}

.game-status {
  margin: 16px auto 18px;
  display: inline-flex;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--color-line-hair-1);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 18px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  background: rgba(255,255,255,0.02);
}
.game-status.status--turn { border-color: var(--color-line-hair-1); }
.game-status.status--win { border-color: var(--color-accent); color: var(--color-text-primary); }
.game-status.status--draw { border-color: var(--color-line-hair-2); color: var(--color-text-secondary); }

.cell.filled { cursor: default; }
.cell.win {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent) inset, 0 8px 24px var(--color-accent-shadow);
}

.restart-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 12px;
  background: var(--color-accent);
  color: #0B0B0B;
  border: 1px solid transparent;
  font-weight: 600;
  font-family: var(--font-sans);
  font-size: 15px;
  cursor: pointer;
  transition: background 160ms cubic-bezier(0.2, 0.8, 0.2, 1), color 160ms cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 160ms;
}
.restart-button:hover { background: var(--color-accent-soft); box-shadow: 0 12px 24px var(--color-accent-shadow); }
.restart-button:active { background: var(--color-accent-strong); }
.restart-button:disabled { opacity: 0.4; cursor: default; box-shadow: none; }

/* Focus rings */
.cell:focus-visible,
.restart-button:focus-visible,
.reset-button:focus-visible,
.select:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

/* Reset scores button (quiet style) */
.reset-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: 12px;
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-line-hair-2);
  font-weight: 600;
  font-family: var(--font-sans);
  font-size: 15px;
  cursor: pointer;
  transition: background 160ms cubic-bezier(0.2, 0.8, 0.2, 1), color 160ms cubic-bezier(0.2, 0.8, 0.2, 1), border-color 160ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.reset-button:hover { background: rgba(255,255,255,0.05); border-color: var(--color-line-hair-1); }
.reset-button:active { background: rgba(0,0,0,0.08); }
.reset-button:disabled { opacity: 0.5; cursor: default; }

.result-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
  background: transparent;
}

.result-overlay--visible {
  opacity: 1;
  background: var(--color-overlay-bg);
}

.result-card {
  padding: 24px 28px;
  border-radius: 20px;
  backdrop-filter: blur(12px);
  background: linear-gradient(135deg, rgba(255,255,255,0.08), rgba(0,0,0,0.35));
  border: 1px solid rgba(255,255,255,0.18);
  box-shadow: 0 24px 60px rgba(0,0,0,0.35);
  min-width: 220px;
}

.result-text {
  margin: 0;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 14px;
  color: var(--color-text-primary);
}

@media (max-width: 480px) {
  .container { margin: 5vh 12px; padding: 24px 16px; }
  .game-board { gap: 6px; padding: 10px; }
}

/* Controls and scoreboard */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: center;
  margin: 8px 0 4px;
}
.start-as label,
.theme label {
  margin-right: 6px;
  color: var(--color-text-secondary);
  font-size: 14px;
}
.theme { display: flex; align-items: center; gap: 6px; }
.select {
  background: var(--color-bg-panel-2);
  color: var(--color-text-primary);
  border: 1px solid var(--color-line-hair-2);
  border-radius: 8px;
  padding: 6px 10px;
  font-family: var(--font-sans);
  font-size: 14px;
  transition: border-color 160ms ease, background 160ms ease;
}
.select:hover { border-color: var(--color-line-hair-1); }

.scoreboard {
  margin-top: 20px;
  display: flex;
  gap: 18px;
  align-items: stretch;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.score {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 16px;
  border: 1px solid var(--color-line-hair-1);
  border-radius: 14px;
  min-width: 110px;
  background: linear-gradient(140deg, rgba(255,255,255,0.03), rgba(0,0,0,0.25));
  box-shadow: 0 14px 30px rgba(0,0,0,0.2);
}

.score-label {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11px;
  color: var(--color-text-muted);
}

.score-value {
  font-size: 22px;
  color: var(--color-text-primary);
}

.score-meter {
  height: 6px;
  border-radius: 999px;
  background: rgba(255,255,255,0.05);
  overflow: hidden;
}

.score-meter span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(255,255,255,0.8), var(--color-accent));
  transform-origin: left;
  transition: width 220ms ease;
}

.score-o .score-meter span { background: linear-gradient(90deg, var(--color-accent-soft), var(--color-accent)); }
.score-x .score-meter span { background: linear-gradient(90deg, rgba(255,255,255,0.9), var(--color-accent-soft)); }
.score-draw .score-meter span { background: linear-gradient(90deg, rgba(255,255,255,0.75), rgba(255,255,255,0.35)); }

/* End-of-game pointer disable */
.game-board.end { pointer-events: none; }

/* Click feedback on mark */
.cell.just-marked { animation: pop 140ms ease-out; }
@keyframes pop { 0% { transform: scale(0.92); } 100% { transform: scale(1); } }

/* Win flash */
.cell.win { animation: winpulse 600ms ease-in-out 0s 2 alternate; }
@keyframes winpulse {
  from { background: rgba(255,255,255,0.04); }
  to { background: var(--color-accent-tint); }
}