* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: Arial, sans-serif;
  background-color: #e0f7fa;
  color: #004d40;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 20px;
  position: relative;
  overflow: hidden;
  min-height: 100vh;
}

body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(ellipse 3px 5px at 50% 30%, rgba(0, 150, 200, 0.4) 0%, rgba(0, 150, 200, 0.3) 40%, transparent 70%),
    radial-gradient(ellipse 2px 4px at 50% 30%, rgba(0, 150, 200, 0.35) 0%, rgba(0, 150, 200, 0.2) 40%, transparent 70%),
    radial-gradient(ellipse 2.5px 4.5px at 50% 30%, rgba(0, 150, 200, 0.3) 0%, rgba(0, 150, 200, 0.25) 40%, transparent 70%),
    radial-gradient(ellipse 1.5px 3px at 50% 30%, rgba(0, 150, 200, 0.25) 0%, rgba(0, 150, 200, 0.15) 40%, transparent 70%);
  background-size: 60px 90px, 95px 140px, 75px 110px, 120px 170px;
  background-position: 0 0, 35px 50px, 80px 25px, 15px 75px;
  animation: rainFall 4s linear infinite;
  pointer-events: none;
  z-index: 0;
}

body > * {
  position: relative;
  z-index: 1;
}

@keyframes rainFall {
  0% {
    background-position: 0 0, 35px 50px, 80px 25px, 15px 75px;
  }
  100% {
    background-position: 0 90px, 35px 140px, 80px 115px, 15px 145px;
  }
}
h1 {
  padding: 0px 0px 30px 0px;
}
button {
  padding: 10px 20px;
  background-color: #00796b;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.3s ease-in-out;

  &:hover {
    background-color: #004d40;
  }
  &:active {
    opacity: 0.5;
  }
}

.question {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 15px;
  padding: 20px;

  & > h2 {
    max-width: 300px;
    text-align: left;
  }
  & > .terminal {
    font-weight: bold;
    min-height: 24px;
    margin-top: -10px;
  }
  & > ul {
    list-style-type: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
    gap: 10px;
    margin: 10px 0;
    
    & > li {
      background-color: #00ad91;
      color: white;
      padding: 10px;
      border-radius: 5px;
      cursor: pointer;
      transition: all 0.3s ease-in-out;

      &:hover {
        background-color: #00796b;
      }
      &:active {
        opacity: 0.5;
      }
    }
  }
}
.right {
  color: darkgreen;
}
.wrong {
  color: darkred;
}
.quiz {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
.hidden {
  display: none;
}

.sound-toggle {
  position: fixed;
  bottom: 20px;
  left: 20px;
  font-size: larger;
  color: #002d3e;
  font-weight: bold;
  padding: 5px;
  cursor: pointer;
  transition: all 0.3s ease-in-out;
  user-select: none;

  &:hover {
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    transform: scale(1.1);
  }
  &:active {
    transform: scale(0.9);
  }
}