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

body{
    background:#eef5ff;
}

.container{
    max-width:1100px;
    margin:30px auto;
}

.header{
    display:flex;
    justify-content:space-between;
    align-items:center;
    margin-bottom:20px;
}

.back{
    text-decoration:none;
    color:white;
    background:#2d6cdf;
    padding:12px 22px;
    border-radius:10px;
    font-weight:bold;
}

.student{
    font-size:24px;
    font-weight:bold;
    color:#333;
}

.points{
    background:#FFD54F;
    padding:12px 20px;
    border-radius:30px;
    font-weight:bold;
}

.card{
    background:white;
    border-radius:20px;
    padding:30px;
    box-shadow:0 10px 25px rgba(0,0,0,.1);
}

.progress{
    margin-bottom:25px;
}

.progress p{
    margin-bottom:8px;
    font-weight:bold;
}

.bar{
    width:100%;
    height:16px;
    background:#ddd;
    border-radius:30px;
    overflow:hidden;
}

.fill{
    width:5%;
    height:100%;
    background:#4CAF50;
}

.image{
    height:350px;
    border-radius:20px;
    background:#dfefff;
    display:flex;
    justify-content:center;
    align-items:center;
    font-size:48px;
    margin-bottom:30px;
}

.story{
    font-size:26px;
    line-height:2;
    color:#333;
    margin-bottom:40px;
}

.word{
    color:#1b73e8;
    font-weight:bold;
    cursor:pointer;
    border-bottom:2px dotted #1b73e8;
}

.word:hover{
    color:#ff6600;
}

.question{
    background:#F7F8FC;
    border-radius:15px;
    padding:25px;
}

.question h2{
    margin-bottom:20px;
}

.answer{
    display:block;
    margin:18px 0;
    font-size:22px;
}

.next{
    margin-top:25px;
    padding:15px 40px;
    background:#2d6cdf;
    color:white;
    border:none;
    border-radius:10px;
    font-size:20px;
    cursor:pointer;
}

.next:hover{
    background:#1d55aa;
}

.readButton{
    background:#4CAF50;
    color:white;
    border:none;
    padding:12px 25px;
    border-radius:10px;
    font-size:18px;
    cursor:pointer;
    margin-bottom:25px;
}

.readButton:hover{
    background:#388E3C;
}

.popup{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background:rgba(0,0,0,.55);
    display:none;
    justify-content:center;
    align-items:center;
}

.popup-box{
    width:500px;
    background:white;
    padding:40px;
    border-radius:20px;
    text-align:center;
    box-shadow:0 15px 40px rgba(0,0,0,.25);
}

.popup-image{
    font-size:90px;
    margin-bottom:20px;
}

.popup h2{
    margin-bottom:20px;
    font-size:34px;
}

.popup p{
    font-size:24px;
    line-height:1.6;
    margin-bottom:30px;
}

.popup button{
    background:#2d6cdf;
    color:white;
    border:none;
    padding:15px 35px;
    font-size:22px;
    border-radius:10px;
    cursor:pointer;
}

.popup button:hover{
    background:#184d9a;
}

.popupButtons{
    display:flex;
    justify-content:center;
    gap:15px;
    margin-top:20px;
    margin-bottom:20px;
}

.popupButtons button{
    padding:12px 18px;
    font-size:18px;
    background:#4CAF50;
    color:white;
    border:none;
    border-radius:10px;
    cursor:pointer;
}

.popupButtons button:hover{
    background:#388E3C;
}

.highlight{
    background:#fff59d;
    padding:4px 8px;
    border-radius:8px;
    transition:.4s;
}