body{
    margin:0;
    font-family:"Microsoft YaHei",sans-serif;
    background:#f2f2f2;
    transition:0.3s;
}

/* 夜间模式 */
body.dark{
    background:#1e1e1e;
    color:#ddd;
}
body.dark .category,
body.dark .info-panel{
    background:#2a2a2a;
    color:#ddd;
}
body.dark a{
    background:#3a3a3a;
    color:#eee;
}
body.dark .top-bar{
    background:#444;
}

/* 顶部栏 */
.top-bar{
    background:#2ecc71;
    padding:12px 20px;
    display:flex;
    align-items:center;
    justify-content:space-between;
    color:#fff;
}
.dark-btn{
    background:#27ae60;
    border:none;
    padding:6px 12px;
    border-radius:4px;
    color:#fff;
    cursor:pointer;
}

/* 布局 */
.layout{
    display:flex;
    padding:20px;
    gap:20px;
}

/* 左侧导航 */
.nav-area{
    flex:1;
    display:flex;
    flex-direction:column;
    gap:20px;
}
.category{
    background:#fff;
    padding:14px;
    border-radius:6px;
    box-shadow:0 2px 6px rgba(0,0,0,0.1);
}
.cat-title{
    margin:0;
    font-size:18px;
    cursor:pointer;
}
.cat-content{
    margin-top:10px;
}
.category a{
    display:inline-block;
    margin:6px 10px 0 0;
    padding:6px 10px;
    background:#f7f7f7;
    border-radius:4px;
    text-decoration:none;
    color:#333;
    font-size:14px;
}
.category a:hover{
    background:#e2e2e2;
}

/* 右侧信息栏 */
.info-panel{
    width:260px;
    background:#fff;
    padding:14px;
    border-radius:6px;
    box-shadow:0 2px 6px rgba(0,0,0,0.1);
}
.info-panel h2{
    margin-top:0;
    font-size:18px;
}

/* 移动端适配 */
@media(max-width:900px){
    .layout{
        flex-direction:column;
    }
    .info-panel{
        width:100%;
    }
}