:root {
  font-size: 55%; /* 1rem = 5.5px, adjusted for smaller fonts */
  height: 100%;
  --primary-color: #4db6ac; /* Teal green */
  --secondary-color: #00796b; /* Darker teal */
  --accent-color: rgba(255, 255, 255, 0.9); /* Light white background */
  --text-color-dark: #333; /* Dark gray for text */
  --text-color-light: #fff; /* White text */
  --box-shadow: 0 0.8rem 2rem rgba(0, 0, 0, 0.20); /* Softer shadow */
  --transition-speed: 150ms; /* Smooth transitions */
}

body {
  height: 100%;
  background-image: url('/images/leaves.jpg');
  background-size: cover;
  background-position: center;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text-color-dark);
  line-height: 1.6;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  width: 90%;
  max-width: 40rem;
  padding: 1.5rem 1rem;
  border-radius: 1rem; /* Rounded corners */
  background: var(--accent-color); /* Light background */
  box-shadow: var(--box-shadow);
  text-align: center;
}

h2 {
  font-size: 2rem;
  margin-bottom: 0.8rem;
  font-weight: 600;
  text-shadow: 0 0.3rem 0.6rem rgba(0, 0, 0, 0.2); /* Subtle shadow */
}

.flex-column {
  display: flex;
  flex-direction: column;
  align-items: center; /* Center items */
}

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

.text-center {
  text-align: center;
}

.choice-container {
  display: flex;
  margin-bottom: 0.8rem;
  width: 100%;
  max-width: 38rem;
  border-radius: 0.8rem;
  border: 0.2rem solid var(--primary-color);
  background-color: var(--accent-color);
  font-size: 1.5rem;
  transition: var(--transition-speed) ease-in-out;
  box-shadow: var(--box-shadow);
}

.choice-container:hover {
  cursor: pointer;
  box-shadow: 0 1.5rem 2.5rem rgba(0, 0, 0, 0.2);
  transform: translateY(-0.3rem);
  transition: var(--transition-speed) ease-in-out;
}

.choice-prefix {
  padding: 0.8rem 1rem; /* Increased left padding */
  background-color: var(--primary-color); /* Matching the choice container */
  color: var(--text-color-light);
  font-weight: bold;
  border-radius: 0.8rem 0.8rem 0.8rem 0.8rem; 
  flex: 0 0 2rem;
  text-align: center;
  margin-left: 0.8rem;
}

.choice-text {
  padding: 0.5rem; /* Increased padding */
  flex: 1; /* Takes remaining space */
  color: var(--text-color-dark);
}

#question {
  font-size: 2.2rem;
  margin-bottom: 1.5rem;
  color: var(--secondary-color); /* Darker teal */
}

.correct {
  background-color: #66bb6a; /* Light green */
  color: var(--text-color-light);
}

.incorrect {
  background-color: #ef5350; /* Light red */
  color: var(--text-color-light);
}

.topContent {
  display: flex;
  justify-content: space-between; 
  font-size: 1.8rem;
  width: 100%;
}

.topContent-prefix.left,
.topContent-prefix.right {
  font-weight: bold;
  font-size: 1.4rem;
  color: var(--secondary-color); /* Darker teal for consistency */
}

#score {
  font-weight: bold;
  font-size: 1.6rem;
  color: var(--text-color-dark); /* Darker teal for consistency */
}

#questionCounter {
  font-weight: bold;
  font-size: 1.6rem;
  color: var(--text-color-dark); /* Darker teal for consistency */
}

.spinner {
  margin: 1.5rem auto;
  width: 5rem; /* Adjusted size for better proportion */
  height: 5rem; /* Keep square shape */
  text-align: center;
}

.spinner > div {
  background-color: var(--primary-color);
  height: 100%;
  width: 1rem; /* Adjusted size for better proportion */
  display: inline-block;
  animation: sk-stretchdelay 1.2s infinite ease-in-out;
}

.spinner .rect2 {
  animation-delay: -1.1s;
}

.spinner .rect3 {
  animation-delay: -1.0s;
}

@keyframes sk-stretchdelay {
  0%, 40%, 100% { transform: scaleY(0.4); }  
  20% { transform: scaleY(1.0); }
}

/* Responsive Design */
@media (max-width: 768px) {
  h2 {
    font-size: 1.8rem; /* Adjusted for smaller screens */
  }

  .choice-container {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
  }

  .choice-prefix {
    font-size: 1.2rem;
    padding: 0.5rem;
  }

  .choice-text {
    font-size: 1.2rem;
    padding: 0.8rem;
  }

  .topContent {
    font-size: 1.2rem;
    margin-bottom: 1rem;
  }

  .topContent-prefix.left,
  .topContent-prefix.right {
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  h2 {
    font-size: 1.6rem; /* Adjusted for very small screens */
  }

  .choice-container {
    font-size: 1rem;
    margin-bottom: 0.6rem;
  }

  .choice-prefix {
    font-size: 1rem;
    padding: 0.4rem;
  }

  .choice-text {
    font-size: 1rem;
    padding: 0.4rem;
  }

  .topContent {
    font-size: 1rem;
    margin-bottom: 0.8rem;
  }

  .topContent-prefix.left,
  .topContent-prefix.right {
    font-size: 1rem;
  }
}