*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}


body {
  background: #0d1a27;
  font-family: Arial, sans-serif;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.start-screen {
  background: linear-gradient(270deg, #007bff, #6610f2, #20c997);
  background-size: 600% 600%;
  animation: gradientBG 8s ease infinite;
  color: white;
  padding: 20px;
  width: 500px;
  height: 300px;
  border-radius: 8px;
  text-align: center;
}
.start-screen h1{
  font-size: 30px;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
.start-screen h2{
  margin-top: 10px;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  /* color: blue; */
}
.start-screen p{
  margin-top: 20px;
  font-weight: 400;
  font-size: large;
  font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

#startBtn{
  background: #007bff;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
  border-radius: 5px;
  margin-top: 30px;
  color: white;
  font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
  font-size: large;
}

#quizBox{
  display: none;
}
.quiz-box {
  background: white;
  width: 500px;
  padding: 40px;
  border-radius: 5px;
  height: 400px;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.options {
  margin: 15px 0;
}

.option {
  width: 100%;
  padding: 10px;
  margin-bottom: 8px;
  border: 1px solid #ccc;
  cursor: pointer;
  background: #f8f8f8;
}

.option.correct {
  background: #b6f2c2;
}

.option.wrong {
  background: #f7b2b2;
}

.quiz-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
} 
.quiz-footer button{
   min-width: 80px;
    background-color: #0d1a27; 
    cursor: pointer;
   padding: 8px 16px;
    border: none;
    color: #007bff;
    color: white;
    border-radius: 5px;       
}

#restartBtn {
  margin-top: 20px;
  padding: 12px 24px;
  background: #4caf50;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 16px;
}

#restartBtn:hover {
  background: #43a047;
  transform: scale(1.05);
}



@media (max-width: 600px) {
  .start-screen,
  .quiz-box {
    width: 90%;        
    height: auto;      
    padding: 20px;}

  .start-screen h1 {
    font-size: 24px;  
  }

  .start-screen h2 {
    font-size: 18px;   
  }

  .start-screen p {
    font-size: 16px;   
  }

  .quiz-footer {
    flex-direction: column; 
    gap: 8px;
  }

  .quiz-footer button {
    width: 100%;       
    text-align: center;
  }
}

@media (max-width: 400px) {
  .start-screen h1 {
    font-size: 20px; 
  }

  .start-screen h2 {
    font-size: 16px; 
  }

  .start-screen p {
    font-size: 14px; 
  }

  #startBtn,
  .quiz-footer button,
  #restartBtn {
    padding: 8px 12px; 
    font-size: 14px;
  }
}