body {
  min-width: 280px;
  min-height: 100vh;
  font-family: 'Arial', sans-serif;
  background-color: #383636;
  color: aliceblue;
}

.header {
  width: 100%;
  height: 5vh;
  margin-bottom: 30px;
}

.main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-top: 30px;
}

.title {
  margin: 0;
  font-size: 40px;
  text-align: center;
  color: rgb(95, 179, 227);
  text-shadow: 2px 2px 4px rgb(113, 113, 226);
  padding-bottom: 10px;
}

.subtitle {
  margin: 0;
  font-size: 15px;
  text-align: center;
  color: rgba(129, 192, 229, 0.99);
  text-shadow: 2px 2px 4px rgb(113, 113, 226);
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-gap: 4px;
  margin: 20px auto;
  border-color: rgb(85, 0, 255);
  box-shadow: 0 0 15px rgba(113, 113, 226, 0.5);
}

.cell {
  width: 100px;
  height: 100px;
  font-size: 60px;
  text-align: center;
  line-height: 100px;
  border: 2px solid #000;
  cursor: pointer;
  transition: background-color 0.3s ease;
  box-shadow: 0 0 15px rgba(113, 113, 226, 0.5);
}

.cell:hover {
  background-color: #9d9a9a;
}

.message {
  font-size: 35px;
  margin: 20px;
  color: #bcb7fc;
  text-shadow: 0 0 15px rgba(113, 113, 226, 0.5);
}

.popup-message {
  font-size: 20px;
  margin: 20px;
  color: #2d2675;
}
.popup {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.628);
  font-size: 25px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.popup-content {
  background: #fff;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(248, 248, 248, 0.5);
  text-align: center;
}

.new-game-btn,
.save-game-btn {
  margin: 15px;
  padding: 10px 20px;
  background-color: #2d2675;
  border: #fff 1px solid;
  color: #fff;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.3s ease;
  box-shadow: 0 0 10px rgba(248, 248, 248, 0.5);
}
.save-game-btn:hover,
.new-game-btn:hover {
  background-color: #6252d7;
}

.winning {
  background-color: #ea4f3e;
  border: 2px solid #f6b0b0;
}
.confetti {
  position: fixed;
  width: 10px;
  height: 10px;
  background-color: #5ff194;
  border-radius: 50%;
  z-index: 9999;
  pointer-events: none;
  animation-name: confetti-fall;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}

@keyframes confetti-fall {
  0% {
    transform: translateY(-100vh) rotateZ(0deg);
  }
  100% {
    transform: translateY(100vh) rotateZ(720deg);
  }
}

@media (max-width: 500px) {
  .cell {
    width: 70px;
    font-size: 50px;
    height: 70px;
    line-height: 70px;
  }
  .board {
    display: grid;
    grid-template-columns: repeat(3, 70px);
    grid-gap: 0px;
  }
}