body{margin:0;font-family:system-ui,sans-serif;background:#f5f5f0;color:#1a1a1a}:root{--topbar-height: 56px;--content-padding: 1.5rem}.shell{height:100vh;display:flex;flex-direction:column}.topbar{height:var(--topbar-height);box-sizing:border-box;display:flex;justify-content:space-between;align-items:center;padding:0 1.5rem;background:#2f5233;color:#fff;flex:0 0 auto}.brand{color:#fff;text-decoration:none;font-weight:600}.topbar-right{display:flex;align-items:center;gap:1rem}button{cursor:pointer}main{flex:1;min-height:0;padding:var(--content-padding);box-sizing:border-box;overflow-y:auto}