:root {
  color-scheme: dark;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  color: #f7f7fb;
  background: #0d0f1a;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(104, 92, 255, 0.2), transparent 28rem),
    radial-gradient(circle at 88% 92%, rgba(44, 210, 188, 0.14), transparent 26rem),
    #0d0f1a;
}

button {
  font: inherit;
}

.game-shell {
  width: min(100% - 32px, 560px);
  margin: 0 auto;
  padding: 48px 0 32px;
}

.hero {
  margin-bottom: 24px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 8px;
  color: #979bb8;
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(3.3rem, 13vw, 5.2rem);
  font-weight: 850;
  letter-spacing: -0.075em;
  line-height: 0.95;
}

h1 span {
  color: #6fddcf;
}

.intro {
  margin: 16px 0 0;
  color: #b7bad0;
  font-size: 0.98rem;
}

.scoreboard {
  display: grid;
  grid-template-columns: 1fr 0.8fr 1fr;
  gap: 10px;
  margin-bottom: 12px;
}

.score-card {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.045);
}

.draw-card {
  flex-direction: column;
  gap: 3px;
  justify-content: center;
}

.score-label {
  overflow: hidden;
  color: #a5a9c2;
  font-size: 0.72rem;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.score-card strong {
  color: #fff;
  font-size: 1.35rem;
}

.player-card strong {
  color: #a59cff;
}

.computer-card strong {
  color: #6fddcf;
}

.game-card {
  padding: clamp(18px, 4vw, 28px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 26px;
  background: rgba(23, 26, 43, 0.88);
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(18px);
}

.turn-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.turn-indicator {
  display: grid;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 12px;
  color: #0d0f1a;
  background: #a59cff;
  font-size: 1.25rem;
  font-weight: 900;
  transition: background 180ms ease;
}

.turn-indicator[data-mark="O"] {
  background: #6fddcf;
}

.turn-indicator[data-mark="draw"] {
  background: #f1bb63;
}

.status {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 750;
}

.board {
  display: grid;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.085);
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
}

.cell {
  display: grid;
  aspect-ratio: 1;
  padding: 0;
  place-items: center;
  border: 0;
  color: #a59cff;
  background: #171a2b;
  cursor: pointer;
  font-size: clamp(2.8rem, 13vw, 4.7rem);
  font-weight: 850;
  line-height: 1;
  transition:
    background 140ms ease,
    transform 140ms ease,
    color 140ms ease;
}

.cell:not(:disabled):hover {
  background: #20243a;
}

.cell:not(:disabled):active {
  transform: scale(0.96);
}

.cell:focus-visible,
.button:focus-visible {
  position: relative;
  z-index: 1;
  outline: 3px solid #f1bb63;
  outline-offset: -3px;
}

.cell:disabled {
  cursor: default;
}

.cell-o {
  color: #6fddcf;
}

.cell-win {
  color: #0d0f1a;
  background: #f1bb63;
}

.actions {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 10px;
  margin-top: 18px;
}

.button {
  min-height: 48px;
  padding: 0 18px;
  border-radius: 13px;
  cursor: pointer;
  font-weight: 760;
  transition:
    transform 140ms ease,
    background 140ms ease;
}

.button:active {
  transform: translateY(1px);
}

.button-primary {
  border: 1px solid #a59cff;
  color: #111322;
  background: #a59cff;
}

.button-primary:hover {
  background: #b7b0ff;
}

.button-quiet {
  border: 1px solid rgba(255, 255, 255, 0.13);
  color: #c2c5d6;
  background: transparent;
}

.button-quiet:hover {
  background: rgba(255, 255, 255, 0.06);
}

.tip {
  margin: 17px 0 0;
  color: #777b97;
  font-size: 0.78rem;
  text-align: center;
}

kbd {
  padding: 2px 6px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 5px;
  color: #aeb1c6;
  background: rgba(255, 255, 255, 0.05);
  font: inherit;
  font-weight: 700;
}

@media (max-width: 440px) {
  .game-shell {
    width: min(100% - 20px, 560px);
    padding-top: 28px;
  }

  .score-card {
    padding: 10px;
  }

  .score-label {
    font-size: 0.62rem;
  }

  .player-card,
  .computer-card {
    flex-direction: column;
    gap: 3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}