body,html{height:100%;margin:0;padding:0;font-family:system-ui,sans-serif;display:flex;flex-direction:column}body{min-height:100vh}main{flex:1 0 auto;padding:1rem}footer{flex-shrink:0;background-color:#f5f5f5;padding:1rem 0;text-align:center;color:#555;font-size:.95rem;border-top:1px solid #ddd}nav{background-color:#fff;padding:1rem 2rem;border-bottom:1px solid #eee}