:root {
  --bg: #0f172a;
  --card: rgba(255,255,255,0.08);
  --text: white;
  --primary: #8b5cf6;
  --secondary: #06b6d4;
  --cell: rgba(255,255,255,0.07);
  --shadow: rgba(0,0,0,0.3);
}

body.light {
  --bg: #f4f7ff;
  --card: rgba(255,255,255,0.8);
  --text: #111827;
  --primary: #7c3aed;
  --secondary: #0891b2;
  --cell: rgba(0,0,0,0.05);
  --shadow: rgba(0,0,0,0.08);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
  transition: 0.4s ease;
}

.background-glow {
  position: fixed;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--primary), transparent 70%);
  filter: blur(120px);
  opacity: 0.25;
  z-index: -1;
}

.container {
  width: 95%;
  max-width: 900px;
  padding: 30px;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.top-bar h1 {
  font-size: 3rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.controls {
  display: flex;
  gap: 10px;
}

button {
  border: none;
  padding: 12px 18px;
  border-radius: 14px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: 0.3s ease;
  font-weight: 600;
  box-shadow: 0 8px 20px var(--shadow);
}

button:hover {
  transform: translateY(-3px) scale(1.03);
}

.mode-select {
  display: flex;
  gap: 15px;
  margin-bottom: 25px;
}

.mode.active {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 20px;
  margin-bottom: 25px;
}

.score-card {
  background: var(--card);
  padding: 20px;
  border-radius: 20px;
  text-align: center;
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 25px var(--shadow);
  transition: 0.3s ease;
}

.score-card:hover {
  transform: translateY(-4px);
}

.score-card p {
  font-size: 2rem;
  margin-top: 10px;
  font-weight: 700;
}

#status {
  text-align: center;
  margin-bottom: 25px;
  font-size: 1.4rem;
  font-weight: 600;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  margin: auto;
}

.cell {
  height: 170px;
  background: var(--cell);
  border-radius: 24px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 4rem;
  cursor: pointer;
  transition: 0.3s ease;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 25px var(--shadow);
}

.cell:hover {
  transform: scale(1.04);
  background: rgba(139,92,246,0.18);
}

.cell.locked {
  background: rgba(255,0,0,0.2);
  pointer-events: none;
}

.cell.ghost {
  color: rgba(255,255,255,0.3);
}

.win {
  animation: pulse 0.8s infinite;
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.08);
  }
  100% {
    transform: scale(1);
  }
}

.chaos-info {
  margin-top: 30px;
  background: var(--card);
  padding: 20px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 10px 25px var(--shadow);
}

@media(max-width: 700px) {
  .top-bar {
    flex-direction: column;
    gap: 20px;
  }

  .scoreboard {
    grid-template-columns: 1fr;
  }

  .cell {
    height: 110px;
    font-size: 3rem;
  }

  .top-bar h1 {
    font-size: 2.2rem;
  }
}