/* 全局 */
body {
    margin:0;
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;
    background:#f5f6fa;
    color:#333;
    line-height:1.7;
}
a {color:#0077ff;text-decoration:none;}
a:hover{text-decoration:underline;}

/* header */
header {background:#222;color:#fff;padding:30px 15px;text-align:center;}
header h1{margin:0;font-size:2rem;}
header p{margin-top:8px;color:#aaa;}

/* 布局 */
.container{display:flex;max-width:1200px;margin:0 auto;}
.sidebar{width:260px;background:#1e1e1e;color:white;padding:20px;min-height:calc(100vh - 110px);}
.sidebar h3{margin-top:0;margin-bottom:15px;}
.sidebar ul{list-style:none;padding:0;}
.sidebar li{margin-bottom:10px;}
.sidebar a{color:#8ab4ff;}
main{flex:1;padding:30px;}
article{background:#fff;padding:25px;margin-bottom:25px;border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,.05);}
article h2{margin-top:0;}
.meta{font-size:0.9rem;color:#888;margin-bottom:15px;}
footer{text-align:center;padding:20px;color:#888;font-size:0.9rem;}

/* 手机适配 */
@media(max-width:900px){
    .container{flex-direction:column;}
    .sidebar{width:100%;min-height:auto;margin-bottom:20px;}
}