:root {
  --bg-1: #0f1020;
  --bg-2: #171b37;
  --text: #f3f4f6;
  --muted: #b7bfd6;
  --card: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.18);
  --x: #65d5ff;
  --o: #ff8ecf;
  --accent: #8a7dff;
  --shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  position: relative;
  overflow: hidden;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 10% 10%, #2a2e61 0%, transparent 40%),
    radial-gradient(circle at 90% 90%, #531f57 0%, transparent 45%),
    linear-gradient(145deg, var(--bg-1), var(--bg-2));
}

body::before,
body::after {
  content: "";
  position: fixed;
  width: 380px;
  height: 380px;
  border-radius: 999px;
  filter: blur(64px);
  z-index: 0;
  opacity: 0.4;
  pointer-events: none;
}

body::before {
  top: -120px;
  left: -110px;
  background: color-mix(in oklab, var(--accent), #6db9ff 28%);
}

body::after {
  right: -130px;
  bottom: -140px;
  background: color-mix(in oklab, var(--o), #351f66 45%);
}

.app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  position: relative;
  z-index: 1;
}

.game-card {
  width: min(100%, 460px);
  backdrop-filter: blur(12px);
  background: linear-gradient(155deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.04));
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 22px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

h1 {
  margin: 0;
  font-size: 1.9rem;
  line-height: 1.1;
}

.scoreboard {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.score {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  border-radius: 14px;
  padding: 10px 8px;
  text-align: center;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.score.active {
  transform: translateY(-2px);
  border-color: color-mix(in oklab, var(--accent), white 12%);
  background: rgba(255, 255, 255, 0.1);
}

.score p {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.score strong {
  display: block;
  margin-top: 4px;
  font-size: 1.35rem;
}

.score.x strong {
  color: var(--x);
}

.score.o strong {
  color: var(--o);
}

.status {
  margin: 18px 0 14px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  text-align: center;
  font-weight: 600;
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.03));
}

.board-wrap {
  border-radius: 18px;
  border: 1px solid var(--border);
  padding: 12px;
  background: rgba(255, 255, 255, 0.03);
}

.board {
  display: grid;
  grid-template-columns: repeat(3, minmax(86px, 1fr));
  gap: 10px;
}

.cell {
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-size: clamp(2rem, 8vw, 2.6rem);
  font-weight: 800;
  cursor: pointer;
  transition: transform 150ms ease, background 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
}

.cell:hover:enabled {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.cell:disabled {
  cursor: default;
}

.cell.x-mark {
  color: var(--x);
  text-shadow: 0 0 18px color-mix(in oklab, var(--x), transparent 50%);
}

.cell.o-mark {
  color: var(--o);
  text-shadow: 0 0 18px color-mix(in oklab, var(--o), transparent 50%);
}

.cell.win {
  border-color: color-mix(in oklab, var(--accent), white 12%);
  background: color-mix(in oklab, var(--accent), transparent 68%);
}

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

.btn {
  border: none;
  border-radius: 12px;
  padding: 10px 14px;
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
  transition: transform 120ms ease, filter 120ms ease, box-shadow 120ms ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #6db9ff);
}

.btn-outline {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
}

.btn:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(1px) scale(0.99);
}

.result-modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(6, 8, 16, 0.62);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 180ms ease, visibility 180ms ease;
  padding: 20px;
}

.result-modal.show {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.result-card {
  width: min(100%, 340px);
  text-align: center;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg-2), black 12%);
  box-shadow: var(--shadow);
  padding: 22px;
  transform: translateY(8px) scale(0.96);
  transition: transform 180ms ease;
}

.result-modal.show .result-card {
  transform: translateY(0) scale(1);
}

.result-card h2 {
  margin: 0;
  font-size: 1.2rem;
}

.result-card p {
  margin: 10px 0 18px;
  color: var(--muted);
  font-weight: 500;
}

@media (max-width: 480px) {
  .game-card {
    padding: 16px;
  }

  h1 {
    font-size: 1.7rem;
  }

  .board {
    gap: 8px;
  }
}