*{
    margin: 0;
    padding: 0;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
}
body{
    background-color: #212121;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.app{
    background-image: linear-gradient(135deg,#0b123a,#063023);
    box-shadow: 0 0 10 #289ef2, 0 0 20 #289ef2;
    max-width: 450px;
    min-width: 320px;
    width: 55%;
    height: auto;
    position: relative;
    border-radius: 20px;
    padding: 30px 35px;  
    text-align: center;  
    overflow: hidden;
}
#h1{
    color: #fff;
    margin-bottom: 10px;
    text-align: center;
}
label{
    display: block;
    font-size: 19px;
    color: #fff;
    text-align: left;
}
select{
    width: 100%;
    margin-top: 15px;
    margin-bottom: 15px;
    border-radius: 10px;
    background-color: #fff;
    border: none;
    outline: none;
    font-size: 17px;
    padding: 10px;
}
select:focus{
    border: 4px solid cyan;
}
.start-btn{
    width: 33%;
    height: 40px;
    font-size: 20px;
    font-weight: 400;
    border-radius: 20px;
    border: none;
    outline: none;
    color: #fff;
    background-color: rgb(151, 240, 56);
    border:  2px solid gray;
    cursor: pointer;
    transition: .6s ease-in;
}
.start-btn:hover{
   border: 4px solid cyan;
}

.number{
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    border-bottom: 2px solid gray;
    padding: 10px;
}
.number>div{
    font-size: 19px;
     font-weight: bold;
}
.number span{
    font-size: 16px;
    color: #289ef2;
     font-weight: bold;
}

.question{
    display: block;
    text-align: left;
    color: #fff;
    margin-top: 30px;
    margin-bottom: 13px;
    font-size: 20px;
    font-weight: bold;
}
.answer{
    text-align: left; 
    border-bottom: 2px solid gray;
}
.answer-text{
    color: #fff;
    font-size: 18px;
    margin-top: 13px;
    margin-bottom: 14px;
    background: transparent;
    text-align: left;
    width: 90%;
    height: auto;
    padding: 7px 12px 15px 12px;
    border-radius: 15px;
    border: 2px solid gray;
    cursor: pointer;
}

 #timer {
      font-size: 18px;
      font-weight: bold;
      margin-bottom: 10px;
      text-align: left;
      color: cyan;
      margin-top: 10px;
      margin-bottom: 10px;
    }
    #timer span{
        color: #fff;
    }
    /* Progress Bar */
    #progress-container {
      width: 100%;
      background: #ddd;
      border-radius: 10px;
      height: 8px;
      margin-bottom: 10px;
      overflow: hidden;
    }
    #progress-bar {
      width: 100%;
      height: 100%;
      background: #27ae60; 
      transition: width 1s linear, background 0.3s ease;
    }
.quiz-question{
    display: none;
}

.Next-btn{
     width: 33%;
    height: 40px;
    font-size: 20px;
    font-weight: 400;
    border-radius: 20px;
    border: none;
    outline: none;
    color: #fff;
    background-color: rgb(151, 240, 56);
    border:  2px solid gray;
    cursor: pointer;
    display: none;
    transition: .6s ease-in;
}
.Next-btn:hover{
   border: 4px solid cyan;
}
.end-screen{
    display: none;
}

.result{
    font-size: 30px;
    color: #fff;
}
.your-score{
    font-size: 25px;
    color: #fff;
    margin-top: 20px;
}

.end{
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin-top: 30px;
}

.play-again{
    width: 43%;
    height: 50px;
    font-size: 20px;
    font-weight: 400;
    border-radius: 20px;
    border: none;
    outline: none;
    color: #fff;
    background-color: rgb(39, 216, 33);
    border:  2px solid gray;
    cursor: pointer;
    transition: .6s ease-in;
}
.play-again:hover{
   border: 4px solid cyan;
}
.exit{
     width: 33%;
    height: 50px;
    font-size: 20px;
    font-weight: 400;
    border-radius: 20px;
    border: none;
    outline: none;
    color: #fff;
    background-color: rgb(253, 132, 57);
    border:  2px solid gray;
    cursor: pointer;
    transition: .6s ease-in;
}
.exit:hover{
   border: 4px solid cyan;
}
@media (max-width:600px) {
    body{
        padding: 20px;
        height: auto;
    }
    .app{
    margin-top: 60px;
    height: auto;
    }
}