body{margin:0;font:15px system-ui,sans-serif}.shell{min-height:100vh;display:flex;flex-direction:column}header{padding:.75rem 1rem;border-bottom:1px solid #ddd}h1{margin:0;font-size:1.25rem}main{flex:1;padding:1rem}footer{padding:.5rem 1rem;border-top:1px solid #ddd;color:#666}.bar{display:flex;gap:.75rem;align-items:center;margin-bottom:1rem}