:root {
  color-scheme: dark;
  --ink: #e8f6ff;
  --dim: #8fb4c9;
  --faint: #4f7185;
  --cyan: #62f0ff;
  --cyan-rgb: 98, 240, 255;
  --ember: #ff4d62;
  --void: #020910;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; min-height: 100%; background: var(--void); }
body {
  display: grid; place-items: start center; padding: max(28px, env(safe-area-inset-top)) 16px 40px;
  font: 400 16px/1.5 -apple-system, 'Segoe UI', Roboto, sans-serif; color: var(--ink);
  background:
    radial-gradient(700px 420px at 80% -10%, rgba(77, 141, 255, 0.14), transparent 60%),
    radial-gradient(600px 400px at 0% 110%, rgba(var(--cyan-rgb), 0.08), transparent 60%),
    var(--void);
}
.card {
  width: 100%; max-width: 440px; padding: 26px 22px 24px; border-radius: 10px;
  background: linear-gradient(180deg, rgba(12, 30, 44, 0.78), rgba(4, 13, 21, 0.9));
  border: 1px solid rgba(var(--cyan-rgb), 0.16); box-shadow: inset 0 1px 0 rgba(var(--cyan-rgb), 0.4);
}
.mark { position: relative; width: 44px; height: 44px; margin: 0 auto; border-radius: 50%; background: radial-gradient(circle at 34% 30%, #bff4ff 0 6%, #3fb4f7 22%, #145fc4 55%, #061a4a 100%); box-shadow: 0 0 18px rgba(63, 180, 247, 0.5), inset -3px -4px 8px rgba(0, 10, 40, 0.6); }
.mark::before { content: ''; position: absolute; inset: 15px -10px; border: 1.5px solid #62f0ff; border-radius: 50%; transform: rotate(-18deg); box-shadow: 0 0 8px rgba(98, 240, 255, 0.7); }
.brand { margin: 8px 0 18px; text-align: center; font: 600 13px/1 ui-monospace, 'Cascadia Mono', monospace; letter-spacing: 0.5em; color: var(--dim); }
h1 { margin: 0 0 8px; font-size: 22px; line-height: 1.25; font-weight: 600; letter-spacing: 0.01em; }
p { margin: 0 0 14px; color: var(--dim); }
.small { font-size: 13.5px; color: var(--faint); }
.err { min-height: 1em; color: var(--ember); font-size: 14.5px; }
label { display: block; margin: 16px 0 6px; font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--dim); }
input {
  width: 100%; height: 56px; padding: 0 14px; border-radius: 8px; text-align: center;
  font: 600 28px/1 ui-monospace, 'Cascadia Mono', monospace; letter-spacing: 0.3em; color: var(--ink);
  background: rgba(2, 9, 16, 0.7); border: 1px solid rgba(var(--cyan-rgb), 0.35); outline: none;
}
input:focus { border-color: var(--cyan); box-shadow: 0 0 0 2px rgba(var(--cyan-rgb), 0.2); }
button, .btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 18px; border-radius: 8px; cursor: pointer;
  font: 700 13px/1.2 ui-monospace, 'Cascadia Mono', monospace; letter-spacing: 0.14em; text-decoration: none; text-align: center;
  color: var(--void); background: var(--cyan); border: 1px solid var(--cyan); box-shadow: 0 0 14px rgba(var(--cyan-rgb), 0.3);
}
#go { width: 100%; margin-top: 14px; }
button:disabled { opacity: 0.5; }
.btn.ghost, button.ghost { color: var(--dim); background: transparent; border-color: rgba(var(--cyan-rgb), 0.3); box-shadow: none; }
.btn.wide { width: 100%; margin-top: 6px; font-size: 11.5px; }
.steps { margin: 16px 0 18px; padding: 0; list-style: none; counter-reset: s; }
.steps li { position: relative; padding: 0 0 20px 42px; counter-increment: s; }
.steps li::before {
  content: counter(s); position: absolute; left: 0; top: -1px; width: 28px; height: 28px; display: grid; place-items: center;
  border-radius: 50%; font: 700 13px/1 ui-monospace, monospace; color: var(--cyan); border: 1px solid rgba(var(--cyan-rgb), 0.5);
}
.steps b { display: block; font-size: 17px; }
.steps span { display: block; margin-top: 3px; font-size: 14.5px; color: var(--dim); }
.steps em { font-style: normal; color: var(--ink); }
.btns { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
pre {
  margin: 10px 0 0; padding: 10px; overflow-x: auto; border-radius: 6px; user-select: all; -webkit-user-select: all;
  font: 12px/1.45 ui-monospace, monospace; color: var(--ink); background: rgba(2, 9, 16, 0.8); border: 1px solid rgba(var(--cyan-rgb), 0.2);
}
.pulse { height: 3px; margin: 20px 0 6px; overflow: hidden; border-radius: 2px; background: rgba(var(--cyan-rgb), 0.12); }
.pulse i { display: block; width: 30%; height: 100%; background: var(--cyan); animation: slide 1.4s ease-in-out infinite alternate; }
@keyframes slide { to { transform: translateX(233%); } }