body{
    margin:0;
    background:#f4f6f8;
    font-family:'Noto Sans',sans-serif;
}
.container{
    width:1200px;
    margin:10px auto;
}
.header{
    background:white;
    padding:18px;
    border-radius:12px;
    box-shadow:0 2px 10px rgba(0,0,0,.08);
    margin-bottom:15px;
}
.header h1{
    margin:0;
    color:#0d47a1;
}
.header h2{
    margin-top:8px;
    color:#666;
    font-size:18px;
    font-weight:normal;
}
.buttons{
    margin-top:15px;
}
button{
    padding:8px 18px;
    border:none;
    border-radius:8px;
    background:#1565c0;
    color:white;
    cursor:pointer;
    margin-right:10px;
}
.main{
    display:grid;
    grid-template-columns:56% 42.5%;
    gap:15px;
}
.card{
    background:white;
    border-radius:12px;
    padding:12px;
    box-shadow:0 2px 10px rgba(0,0,0,.08);
}
.story{
    margin-bottom:20px;
}
.hanzi{
    font-family:'Noto Sans SC';
    font-size:28px;
    line-height:1.6;
}
.pinyin{
    color:#1565c0;
    font-size:17px;
}
.vi{
    color:#666;
    font-size:16px;
}
table{
    width:100%;
    border-collapse:collapse;
}
th{
    background:#1976d2;
    color:white;
}
th,td{
    border:1px solid #ddd;
    padding:2px;
    text-align:left;
}
.section{
    margin-top:16px;
}
.section h3{
    color:#1565c0;
}
.footer{
    margin-top:15px;
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:15px;
}
.hide{
    display:none;
}

.nav{
    display:flex;
    justify-content:center;
    gap:15px;
    margin:20px 0;
}
.btn{
    padding:10px 16px;
    border-radius:10px;
    background:#1976d2;
    color:#fff;
    text-decoration:none;
    font-weight:bold;
    transition:.2s;
}
.btn:hover{
    background:#0d47a1;
}