/* Gradient overlay behind game */
.gradient-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(-45deg, #ff416c, #ff4b2b, #1c92d2, #f2fcfe);
  background-size: 400% 400%;
  animation: gradientBG 15s ease infinite;
  z-index: -1; /* behind everything */
}

/* Keyframes for gradient animation */
@keyframes gradientBG {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

body {
  margin: 0;
  padding: 0;
  text-align: center;
  font-family: "Arial", sans-serif;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

/* Title */
#level-title {
  font-family: "Press Start 2P", cursive;
  font-size: 3rem;
  margin: 5%;
  color: #fef2bf;
  text-shadow: 2px 2px 4px #000;
}

/* Game container */
.container {
  display: block;
  width: 50%;
  margin: auto;
}

/* Buttons */
.btn {
  margin: 25px;
  display: inline-block;
  height: 180px;
  width: 180px;
  border: none;
  border-radius: 30%;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  position: relative;
}

/* Gradient inner glow for each button */
.red {
  background: linear-gradient(145deg, #ff4b2b, #ff1e00);
}
.green {
  background: linear-gradient(145deg, #28e100, #00a800);
}
.blue {
  background: linear-gradient(145deg, #00c3ff, #0066ff);
}
.yellow {
  background: linear-gradient(145deg, #fff500, #ffd600);
}

/* Hover effect - slightly enlarge and glow */
.btn:hover {
  transform: scale(1.1);
  box-shadow: 0 0 25px rgba(255, 255, 255, 0.7), 0 5px 20px rgba(0, 0, 0, 0.3);
}

/* Pressed effect - darken and glow */
.pressed {
  filter: brightness(1.2);
  box-shadow: 0 0 40px #fff, 0 5px 20px rgba(0, 0, 0, 0.3);
}

.btn,
.pressed {
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
}