body{font-family:system-ui,sans-serif;margin:0;color:#111;background:#fafafa}
header{display:flex;gap:1rem;align-items:center;padding:.75rem 1rem;background:#fff;border-bottom:1px solid #ddd}
header a{font-weight:600;text-decoration:none;color:inherit;margin-right:auto}
main{max-width:46rem;margin:1rem auto;padding:0 1rem}
.stack{display:flex;flex-direction:column;gap:.75rem;max-width:22rem}.row{display:flex;gap:.5rem}.row input{flex:1}
input,button{padding:.5rem;font:inherit}.err{color:#b00020}.msg{padding:.5rem;margin:.4rem 0;border-radius:6px;background:#fff;white-space:pre-wrap}
.msg.user{background:#eef3ff}table{border-collapse:collapse;width:100%}td,th{border-bottom:1px solid #ddd;padding:.3rem;text-align:left}