/* 后台样式 */
*{box-sizing:border-box;margin:0;padding:0}
html,body{font-family:"Microsoft YaHei","PingFang SC",sans-serif;background:#f4f6fb;color:#333;font-size:14px;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}

.layout{display:flex;min-height:100vh}
.sidebar{width:220px;background:#2a2e3a;color:#cfd2da;flex-shrink:0;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.brand{padding:24px 18px 18px;border-bottom:1px solid rgba(255,255,255,.06)}
.brand-name{font-size:17px;font-weight:bold;color:#fff;line-height:1.3}
.brand-sub{font-size:11px;color:#7a7e8a;margin-top:3px;letter-spacing:.5px}
.nav{padding:14px 0;flex:1}
.nav a{display:flex;align-items:center;padding:11px 22px;color:#cfd2da;font-size:14px;transition:.2s;border-left:3px solid transparent}
.nav a:hover{background:rgba(255,255,255,.04);color:#fff}
.nav a.active{background:rgba(91,110,246,.15);color:#5b6ef6;border-left-color:#5b6ef6;font-weight:bold}
.nav a .ic{margin-right:10px;font-size:16px;width:18px;display:inline-block;text-align:center}

.main{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{height:54px;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.04);display:flex;justify-content:space-between;align-items:center;padding:0 22px;position:sticky;top:0;z-index:10}
.tb-title{font-size:15px;font-weight:bold;color:#333}
.tb-user{font-size:13px;color:#888}
.tb-user b{color:#5b6ef6;margin-left:4px}

.content{padding:22px;flex:1}
.foot{padding:14px 22px;text-align:center;color:#aaa;font-size:12px}

@media(max-width:768px){
  .sidebar{width:60px}
  .brand-name,.brand-sub{display:none}
  .brand{padding:14px 10px;text-align:center}
  .brand::before{content:'SD';color:#5b6ef6;font-weight:bold;font-size:18px}
  .nav a{padding:11px 0;justify-content:center}
  .nav a .ic{margin:0;font-size:18px}
  .nav a span:not(.ic){display:none}
  .content{padding:14px}
}