body{font:16px/1.5 system-ui,sans-serif;max-width:26rem;margin:12vh auto;padding:0 1rem}
h1{font-size:1.4rem}label{display:block;margin:.6rem 0 .2rem}
input,button{font:inherit;padding:.5rem .6rem;width:100%;box-sizing:border-box}
button{margin-top:.8rem;cursor:pointer}.hint{color:#555;font-size:.9rem}
#msg{margin-top:.8rem;min-height:1.4em}#msg.err{color:#b00}#msg.ok{color:#070}