:root{
  --ink:#161a2b; --board:#1d2340; --paper:#f3efe4; --paper-2:#eae4d3;
  --brass:#a67c2e; --brass-2:#c99b45; --rule:#c9c0a8; --red:#8c2f2f;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{display:flex;align-items:center;justify-content:center;padding:1.5rem;
  background:var(--board);color:var(--ink);
  font:17px/1.6 "Alegreya",Georgia,serif;
  background-image:radial-gradient(circle at 50% 0%,#2a3157 0%,var(--board) 55%,#141830 100%)}
form{width:min(24rem,100%);background:var(--paper);
  border:2px solid var(--brass);border-top-width:6px;
  padding:2rem 2rem 1.7rem;box-shadow:6px 6px 0 rgba(10,12,24,.45)}
.crest{font-family:"Grenze",serif;font-size:1.6rem;color:var(--brass);
  text-align:center;line-height:1;letter-spacing:.4em;margin-left:.4em}
h1{font-family:"Grenze",serif;font-weight:700;font-size:2.2rem;line-height:1.1;
  margin:.35rem 0 .1rem;text-align:center;color:var(--board)}
.sub{font-family:"IBM Plex Mono",monospace;font-size:.66rem;letter-spacing:.14em;
  text-transform:uppercase;text-align:center;color:#7a7460;
  border-bottom:1px solid var(--rule);padding-bottom:1rem;margin-bottom:1.2rem}
label{display:block;font-family:"IBM Plex Mono",monospace;font-size:.66rem;
  text-transform:uppercase;letter-spacing:.12em;color:#6b6450;margin-bottom:.25rem}
input{width:100%;padding:.5rem .6rem;margin-bottom:1rem;
  border:1px solid var(--rule);border-radius:3px;background:#fff;color:var(--ink);
  font:15px "IBM Plex Mono",monospace}
input:focus{outline:2px solid var(--brass);outline-offset:1px}
button{width:100%;padding:.6rem 1rem;margin-top:.2rem;border:none;border-radius:3px;
  background:var(--brass);color:#fff;cursor:pointer;
  font:.78rem "IBM Plex Mono",monospace;letter-spacing:.1em;text-transform:uppercase}
button:hover{background:var(--brass-2)}
.err{background:#f7e6e2;border-left:3px solid var(--red);color:var(--red);
  padding:.5rem .7rem;margin:0 0 1.1rem;font-size:.88rem}
.foot{margin-top:1.2rem;text-align:center;font-family:"IBM Plex Mono",monospace;
  font-size:.62rem;letter-spacing:.08em;color:#9a927c}
:focus-visible{outline:2px solid var(--brass);outline-offset:2px}