:root {
  --color-bg-primary: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-surface: #334155;
  --color-accent: #38bdf8;
  --color-accent-hover: #0ea5e9;
  --color-x: #f43f5e;
  --color-o: #10b981;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  padding: 20px;
}

.header {
  text-align: center;
  margin-bottom: 2rem;
}

h1 {
  font-size: 3rem;
  background: linear-gradient(
    135deg,
    var(--color-accent) 0%,
    var(--color-o) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
  animation: fadeIn 0.6s ease-out;
}

.game-info {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.info-card {
  background: var(--color-bg-secondary);
  padding: 1rem 1.5rem;
  border-radius: 12px;
  border: 2px solid var(--color-surface);
  min-width: 120px;
  text-align: center;
  transition: transform 0.2s, border-color 0.2s;
}

.info-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
}

.info-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.info-value {
  font-size: 1.5rem;
  font-weight: bold;
}

.info-value.x-color {
  color: var(--color-x);
}

.info-value.o-color {
  color: var(--color-o);
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.game-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding: 20px;
  background: var(--color-bg-secondary);
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  animation: scaleIn 0.5s ease-out;
}

.box {
  width: 110px;
  height: 110px;
  background: var(--color-surface);
  border: none;
  border-radius: 16px;
  font-size: 3rem;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--color-accent) 0%, transparent 100%);
  opacity: 0;
  transition: opacity 0.3s;
}

.box:hover:not(:disabled)::before {
  opacity: 0.1;
}

.box:hover:not(:disabled) {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.3);
}

.box:active:not(:disabled) {
  transform: scale(0.95);
}

.box:disabled {
  cursor: not-allowed;
}

.box.x {
  color: var(--color-x);
  animation: popIn 0.3s ease-out;
}

.box.o {
  color: var(--color-o);
  animation: popIn 0.3s ease-out;
}

.box.winning {
  animation: winPulse 0.6s ease-in-out infinite;
}

.controls {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

button.control-btn {
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

#reset-btn {
  background: var(--color-surface);
  color: var(--color-text);
}

#reset-btn:hover {
  background: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(56, 189, 248, 0.3);
}

#new-btn {
  background: var(--color-accent);
  color: var(--color-bg-primary);
}

#new-btn:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(56, 189, 248, 0.4);
}

.msg-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  z-index: 1000;
  animation: fadeIn 0.3s ease-out;
}

.msg-container.hide {
  display: none;
}

#msg {
  font-size: 2.5rem;
  font-weight: bold;
  text-align: center;
  padding: 0 2rem;
  animation: bounceIn 0.6s ease-out;
}

.winner-x {
  color: var(--color-x);
}

.winner-o {
  color: var(--color-o);
}

.draw {
  color: var(--color-accent);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes scaleIn {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes popIn {
  0% {
    transform: scale(0);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes bounceIn {
  0% {
    transform: scale(0.3);
    opacity: 0;
  }
  50% {
    transform: scale(1.05);
  }
  70% {
    transform: scale(0.9);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes winPulse {
  0%,
  100% {
    transform: scale(1);
    box-shadow: 0 0 20px rgba(56, 189, 248, 0.5);
  }
  50% {
    transform: scale(1.1);
    box-shadow: 0 0 30px rgba(56, 189, 248, 0.8);
  }
}

@media (max-width: 600px) {
  h1 {
    font-size: 2rem;
  }

  .box {
    width: 90px;
    height: 90px;
    font-size: 2.5rem;
  }

  #msg {
    font-size: 1.8rem;
  }

  .game-info {
    gap: 1rem;
  }

  .info-card {
    min-width: 100px;
    padding: 0.75rem 1rem;
  }
}

@media (max-width: 400px) {
  .box {
    width: 75px;
    height: 75px;
    font-size: 2rem;
  }
}