*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei",sans-serif;
}
body{
    background-color: #2c3e50;
    display:flex;
    justify-content:center;
    align-items:center;
    min-height:100vh;
}
.container{
    width:90%;
    max-width:600px;
}
h1{
    color:#fff;
    text-align:center;
    margin-bottom:24px;
}
.quiz-box{
    background:white;
    padding:30px;
    border-radius:12px;
}
.question-text{
    font-size:20px;
    font-weight:bold;
    margin-bottom:20px;
    line-height:1.6;
}
.option-item{
    background:#ecf0f1;
    padding:14px;
    border-radius:8px;
    margin-bottom:12px;
    cursor:pointer;
    transition: 0.3s;
}
.option-item:hover{
    background:#d0d7d9;
}
.option-item.correct{
    background:#27ae60;
    color:white;
}
.option-item.wrong{
    background:#e74c3c;
    color:white;
}
.score-area{
    margin:16px 0;
    font-size:18px;
    font-weight:bold;
}
.next-btn{
    width:100%;
    padding:14px;
    background:#3498db;
    color:white;
    border:none;
    border-radius:8px;
    font-size:17px;
    cursor:pointer;
}
.next-btn:disabled{
    background:#95a5a6;
    cursor:not-allowed;
}