*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;background:#f5f6f8;color:#111}
.layout{display:flex;min-height:100vh}
aside{width:240px;background:#fff;border-right:1px solid #ddd;padding:20px}
nav div{padding:10px 12px;border-radius:8px;margin:4px 0}
.active{background:#111;color:#fff}
main{flex:1;padding:28px}
header{display:flex;justify-content:space-between;align-items:center}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:20px 0}
.panel{background:#fff;border:1px solid #ddd;border-radius:10px;padding:20px}
table{width:100%;border-collapse:collapse}
td,th{padding:12px;border-bottom:1px solid #eee;text-align:left}
pre{background:#111;color:#ddd;padding:16px;border-radius:8px}
@media(max-width:700px){
 aside{width:72px}
 nav div{font-size:0}
 main{padding:14px}
 .grid{grid-template-columns:1fr}
}