:root{font:16px/1.45 system-ui,sans-serif;color:#111;background:#f3f1ec}body{margin:0}a{color:inherit}.shell{display:grid;grid-template-columns:220px 1fr;min-height:100vh}nav{background:#1a1a1a;padding:20px 16px}nav,nav a{color:#fff}nav a{display:block;text-decoration:none;margin:10px 0}.content{padding:24px}.card{background:#fff;border:1px solid #ddd6cb;padding:16px;margin-bottom:12px}input,select,textarea{width:100%;padding:8px;margin:6px 0 12px;box-sizing:border-box}.btn,button{padding:8px 12px;border:0;background:#1a1a1a;color:#fff;cursor:pointer;text-decoration:none;display:inline-block}.err{color:#8a1f1f}table{width:100%;border-collapse:collapse;background:#fff}td,th{text-align:left;padding:8px;border-bottom:1px solid #eee}