body {
  background: linear-gradient(45deg, #1a1a2e, #16213e);
  font-family: "Poppins", sans-serif;
  min-height: 100vh;
  padding: 40px 20px;
  color: #fff;
  overflow-x: hidden;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 15px;
  position: relative;
}

.title {
  text-align: center;
  color: #00ddeb;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin: 0 0 40px;
  text-shadow: 0 0 10px rgba(0, 221, 235, 0.7);
  animation: glow 2s infinite alternate;
}

@keyframes glow {
  from {
    text-shadow: 0 0 10px rgba(0, 221, 235, 0.7);
  }
  to {
    text-shadow: 0 0 20px rgba(0, 221, 235, 0.9);
  }
}

#instructions-btn {
  display: block;
  margin: 20px auto;
  padding: 10px 25px;
  font-size: clamp(1rem, 2vw, 1.25rem);
  border-radius: 30px;
  background: linear-gradient(45deg, #ff3366, #ff6b6b);
  border: none;
  color: #fff;
  font-weight: 600;
  transition: all 0.3s ease;
}

#instructions-btn:hover {
  background: linear-gradient(45deg, #cc294f, #d65c5c);
  transform: scale(1.05);
  box-shadow: 0 5px 15px rgba(255, 51, 102, 0.4);
}

.instructions {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  padding: 20px;
  margin: 20px 0;
  text-align: center;
  animation: slideIn 0.5s ease;
}

.instructions.hidden {
  display: none;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.game-wrapper {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  justify-content: center;
}

.card-section {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 20px;
  padding: 25px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 0.3s ease;
}

.card-section:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

h2 {
  color: #fff;
  font-weight: 600;
  margin-bottom: 20px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

#player-board,
#computer-board {
  grid-gap: 1px; /* Reduced from 2px to 1px */
}

.cell {
  width: clamp(50px, 12vw, 70px);
  height: clamp(50px, 12vw, 70px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.1);
  cursor: pointer;
  transition: all 0.3s ease;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.cell:hover:not(.marked):not(.marked-computer) {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}

.marked {
  background: linear-gradient(45deg, #00ff95, #00ddeb) !important;
  color: #fff;
  animation: markAnimation 0.5s ease, pulse 1.5s infinite;
}

.marked-computer {
  background: linear-gradient(45deg, #ff3366, #ff6b6b) !important;
  color: #fff;
  animation: markAnimation 0.5s ease, pulse 1.5s infinite;
}

@keyframes markAnimation {
  0% {
    transform: scale(0.8);
    opacity: 0;
  }
  50% {
    transform: scale(1.15);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.7);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(255, 255, 255, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
  }
}

#player-turn {
  padding: 12px 30px;
  font-size: clamp(1rem, 2vw, 1.25rem);
  border-radius: 30px;
  background: linear-gradient(45deg, #00ddeb, #00ff95);
  border: none;
  color: #fff;
  font-weight: 600;
  transition: all 0.3s ease;
  text-transform: uppercase;
}

#player-turn:hover {
  background: linear-gradient(45deg, #00b8c4, #00cc79);
  transform: scale(1.05);
  box-shadow: 0 5px 15px rgba(0, 221, 235, 0.4);
}

#player-turn:disabled {
  background: rgba(255, 255, 255, 0.1);
  cursor: not-allowed;
  box-shadow: none;
}

#status {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  margin: 15px 0;
  font-weight: 500;
  color: #ff3366;
  animation: fadeIn 0.5s ease;
}

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

p {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: #fff;
  margin-bottom: 10px;
}

#computer-card-section {
  display: none;
}

#player-bingo,
#computer-bingo {
  font-weight: 700;
  letter-spacing: 2px;
}

#player-bingo .crossed,
#computer-bingo .crossed {
  text-decoration: line-through;
  color: rgba(255, 255, 255, 0.5);
  animation: crossOut 0.5s ease;
}

@keyframes crossOut {
  from {
    text-decoration: none;
    color: #fff;
  }
  to {
    text-decoration: line-through;
    color: rgba(255, 255, 255, 0.5);
  }
}

.watermark {
  text-align: center;
  margin-top: 40px;
  font-size: clamp(0.8rem, 2vw, 1rem);
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
  letter-spacing: 1px;
}

@media (max-width: 768px) {
  .game-wrapper {
    grid-template-columns: 1fr;
  }
  .card-section {
    width: 100%;
    max-width: 450px;
    margin: 0 auto;
  }
}

@media (min-width: 769px) {
  #computer-card-section.show {
    display: block;
  }
}