*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;background:#f5f5f5}#root{min-height:100vh}.app{max-width:900px;margin:0 auto;padding:1rem}.card{background:#fff;border-radius:8px;padding:1.25rem;margin-bottom:1rem;box-shadow:0 1px 3px #00000014}h1{margin:0 0 1rem;font-size:1.5rem}h2{margin:0 0 .5rem;font-size:1.15rem}form{display:flex;flex-direction:column;gap:.75rem;max-width:320px}label{font-weight:500}input{padding:.5rem .75rem;border:1px solid #ccc;border-radius:4px}button{padding:.5rem 1rem;background:#2563eb;color:#fff;border:none;border-radius:4px;cursor:pointer;font-weight:500}button:hover{background:#1d4ed8}button.secondary{background:#64748b}button.secondary:hover{background:#475569}.error{color:#b91c1c;font-size:.875rem}ul{list-style:none;padding:0;margin:0}li{padding:.5rem 0;border-bottom:1px solid #eee}li:last-child{border-bottom:none}nav{margin-bottom:1rem}nav a{margin-right:1rem;color:#2563eb;text-decoration:none}nav a:hover{text-decoration:underline}