:root {
  --neon-pink-main: #ff00ff;
  --neon-pink-light: #ff66ff;
  --neon-pink-dark: #cc00cc;
  --bg-dark: #180a18;
  --bg-medium: #2e1a3a;
  --display-bg: #1f0f26;
  --text-color: #ffffff;
  --text-neon: var(--neon-pink-main);
}

body {
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--bg-dark);
  overflow: hidden;
  font-family: 'Orbitron', sans-serif;
  color: var(--text-neon);
}

canvas {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 0;
}

#welcomeScreen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(24, 10, 24, 0.85);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 2;
}

#welcomeButton {
  padding: 25px 50px;
  font-size: 1.8rem;
  font-weight: bold;
  color: var(--text-color);
  background: linear-gradient(145deg, var(--neon-pink-light), var(--neon-pink-dark));
  border: none;
  border-radius: 20px;
  cursor: pointer;
  box-shadow: 0 0 12px var(--neon-pink-light), 0 0 24px var(--neon-pink-light) inset;
  transition: all 0.3s ease;
  animation: galacticBlink 1.2s infinite alternate;
}

@keyframes galacticBlink {
  0% {
    box-shadow: 0 0 12px var(--neon-pink-light), 0 0 24px var(--neon-pink-light) inset;
    transform: scale(1);
  }

  50% {
    box-shadow: 0 0 30px var(--neon-pink-main), 0 0 50px var(--neon-pink-light) inset;
    transform: scale(1.05);
  }

  100% {
    box-shadow: 0 0 15px var(--neon-pink-light), 0 0 30px var(--neon-pink-light) inset;
    transform: scale(1);
  }
}

#loadingBarContainer {
  margin-top: 40px;
  width: 400px;
  height: 30px;
  border-radius: 15px;
  border: 2px solid var(--neon-pink-main);
  overflow: hidden;
  display: none;
  position: relative;
  z-index: 2;
}

#loadingBar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--neon-pink-light), var(--neon-pink-main));
  box-shadow: 0 0 12px var(--neon-pink-light), 0 0 20px var(--neon-pink-light) inset;
  border-radius: 15px;
  text-align: center;
  line-height: 30px;
  color: #000;
  font-weight: bold;
  transition: width 0.1s ease;
}

.calculator-wrapper {
  display: none;
  z-index: 1;
  opacity: 0;
  transform: scale(0.8);
  transition: all 0.7s ease;
}

.calculator-wrapper.show {
  display: block;
  opacity: 1;
  transform: scale(1);
}

.calculator {
  position: relative;
  z-index: 1;
  background: linear-gradient(145deg, var(--bg-medium), var(--bg-dark));
  padding: 40px;
  border-radius: 25px;
  width: 380px;
  border: none;
  box-shadow:
    0 0 6px var(--neon-pink-main),
    0 0 12px var(--neon-pink-main),
    0 0 20px var(--neon-pink-main),
    inset 0 0 5px rgba(255, 0, 255, 0.1);
  overflow: visible;
}

.display {
  background: var(--display-bg);
  color: var(--neon-pink-main);
  font-size: 2.2rem;
  padding: 25px;
  border-radius: 18px;
  margin-bottom: 25px;
  text-align: right;
  min-height: 60px;
  overflow-x: auto;
  box-shadow: inset 0 0 15px rgba(255, 0, 255, 0.2);
  transition: transform 0.3s cubic-bezier(.68, -0.55, .265, 1.55), box-shadow 0.3s;
  font-family: 'Orbitron', sans-serif;
}

.display.bounce {
  transform: scale(1.15);
  box-shadow: 0 0 25px var(--neon-pink-main), 0 0 40px var(--neon-pink-main) inset;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
}

button {
  padding: 18px;
  font-size: 1.3rem;
  border: none;
  border-radius: 15px;
  cursor: pointer;
  background: linear-gradient(145deg, #3a2c6a, var(--bg-medium));
  color: var(--neon-pink-main);
  box-shadow: 0 6px 25px rgba(0, 0, 0, 0.7);
  transition: all 0.2s ease, box-shadow 0.3s, transform 0.2s;
  position: relative;
  overflow: hidden;
  font-family: 'Orbitron', sans-serif;
}

button:hover {
  transform: scale(1.1);
  box-shadow: 0 0 20px var(--neon-pink-main), 0 0 25px var(--neon-pink-main) inset;
}

button:active {
  transform: scale(0.95);
  box-shadow: 0 0 12px var(--neon-pink-main), 0 0 18px var(--neon-pink-main) inset;
}

button.equals {
  grid-column: span 4;
  background: linear-gradient(145deg, var(--neon-pink-light), var(--neon-pink-dark));
  color: var(--text-color);
  font-weight: bold;
  font-size: 1.6rem;
  box-shadow: 0 0 8px var(--neon-pink-light), 0 0 16px var(--neon-pink-light) inset;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 8px var(--neon-pink-light), 0 0 16px var(--neon-pink-light) inset;
  }

  50% {
    box-shadow: 0 0 15px var(--neon-pink-main), 0 0 30px var(--neon-pink-main) inset;
  }

  100% {
    box-shadow: 0 0 8px var(--neon-pink-light), 0 0 16px var(--neon-pink-light) inset;
  }
}