* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
  text-align: center;
}

body {
  background: radial-gradient(circle at top, #101820, #05080b);
  color: white;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.game-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

h1 {
  font-size: 2.5rem;
  letter-spacing: 1px;
  color: #00ffe1;
}

h2 {
  color: #ccc;
  font-size: 1.2rem;
  font-weight: 400;
  transition: color 0.3s ease;
}

.glass {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(15px);
  border-radius: 20px;
  padding: 25px 30px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 0 20px rgba(0, 255, 200, 0.15);
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.side_one,
.side_two {
  display: flex;
}

.btn {
  width: 140px;
  height: 140px;
  border-radius: 20%;
  margin: 12px;
  cursor: pointer;
  border: none;
  transition: transform 0.1s ease, box-shadow 0.3s ease;
}

.btn:hover {
  transform: scale(1.05);
}

.red {
  background-color: #ff4b4b;
  box-shadow: 0 0 25px rgba(255, 75, 75, 0.6);
}

.yellow {
  background-color: #fcd34d;
  box-shadow: 0 0 25px rgba(252, 211, 77, 0.6);
}

.blue {
  background-color: #3b82f6;
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.6);
}

.green {
  background-color: #22c55e;
  box-shadow: 0 0 25px rgba(34, 197, 94, 0.6);
}

.flash {
  filter: brightness(2);
  transform: scale(1.1);
}

body.game-over {
  background: radial-gradient(circle at top, #440000, #000);
}

span {
  color: #00ffe1;
  font-weight: 600;
}