*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:14px;line-height:1.5;color:#1a1a1a;background:#f5f5f5}#root{min-height:100vh}a{color:#2563eb;text-decoration:none}a:hover{text-decoration:underline}button{font:inherit;cursor:pointer;padding:.5rem .75rem;border:1px solid #ccc;border-radius:6px;background:#fff}button:hover{background:#f0f0f0}button.primary{background:#2563eb;color:#fff;border-color:#2563eb}button.primary:hover{background:#1d4ed8}.app-layout{display:flex;min-height:100vh}.nav{width:200px;padding:1rem;background:#fff;border-right:1px solid #e5e5e5}.nav h2{margin:0 0 1rem;font-size:1rem;font-weight:600}.nav ul{list-style:none;margin:0;padding:0}.nav li{margin-bottom:.25rem}.nav a{display:block;padding:.5rem;border-radius:4px}.nav a:hover,.nav a.active{background:#eff6ff;color:#1d4ed8}.main{flex:1;padding:1.5rem;overflow:auto}.card{background:#fff;border-radius:8px;border:1px solid #e5e5e5;padding:1rem;margin-bottom:1rem}.card h3{margin:0 0 .5rem;font-size:.875rem;font-weight:600;color:#666}.empty{color:#666;font-style:italic}.error{color:#b91c1c;font-size:.875rem}