:root { color-scheme: dark; --bg: #04060c; --panel: #0a101d; --line: #17223a; --text: #e8f1ff; --muted: #64748f; --cyan: #22d3ee; --cyan-2: #67e8f9; --bad: #fb7185; }
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  display: grid; place-items: center; padding: 16px;
  background:
    radial-gradient(900px 480px at 20% -10%, rgba(34, 211, 238, .2), transparent 60%),
    radial-gradient(800px 420px at 100% 110%, rgba(245, 158, 11, .12), transparent 60%),
    linear-gradient(rgba(34, 211, 238, .035) 1px, transparent 1px) 0 0 / 100% 42px,
    linear-gradient(90deg, rgba(34, 211, 238, .035) 1px, transparent 1px) 0 0 / 42px 100%,
    var(--bg);
  color: var(--text); font: 14px/1.5 "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
}
.card { width: 100%; max-width: 360px; background: linear-gradient(180deg, #0e1526, var(--panel)); border: 1px solid var(--line);
  border-radius: 12px; padding: 32px 28px 22px; text-align: center; box-shadow: 0 24px 60px rgba(0, 0, 0, .5), 0 0 40px rgba(34, 211, 238, .08);
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px); }
.mark { width: 46px; height: 46px; filter: drop-shadow(0 0 10px rgba(34, 211, 238, .4)); }
h1 { margin: 10px 0 0; font: 700 22px "Rajdhani", sans-serif; letter-spacing: .26em; color: var(--cyan-2); text-shadow: 0 0 14px rgba(34, 211, 238, .3); }
.sub { margin: 2px 0 22px; color: var(--muted); font: 600 11px "Rajdhani", sans-serif; letter-spacing: .3em; text-transform: uppercase; }
form { display: grid; gap: 10px; text-align: left; }
label { font: 700 11px "Rajdhani", sans-serif; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); }
input { width: 100%; padding: 12px 14px; border-radius: 6px; border: 1px solid var(--line); background: #060a14; color: var(--text);
  font: 500 15px "JetBrains Mono", ui-monospace, monospace; outline: none; }
input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(34, 211, 238, .18); }
button { margin-top: 6px; padding: 12px; border: 0; border-radius: 6px; background: var(--cyan); color: #04121a;
  font: 700 14px "Rajdhani", sans-serif; letter-spacing: .14em; text-transform: uppercase; cursor: pointer; box-shadow: 0 0 18px rgba(34, 211, 238, .35); }
button:hover { filter: brightness(1.1); }
.err { display: none; color: var(--bad); font-size: 13px; margin: 14px 0 0; }
.err.show { display: block; }
.foot { color: var(--muted); font-size: 11.5px; margin: 20px 0 0; }