:root {
  --bg: #07080b;
  --surface: #11131a;
  --line: #262a36;
  --text: #f3f4f8;
  --muted: #a3a8b8;
  --cyan: #22d3ee;
  --blue: #5b7cf5;
  --violet: #7c6bff;
  --danger: #ff7a85;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex;
  justify-content: center;
  padding: 32px 16px;
}

.card {
  width: 100%;
  max-width: 420px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px 24px;
}

.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }

.shield {
  width: 40px; height: 40px; border-radius: 12px;
  display: grid; place-items: center;
  font-weight: 800; color: #fff;
  background: linear-gradient(135deg, var(--cyan), var(--blue) 55%, var(--violet));
}

.name { font-weight: 700; letter-spacing: .04em; }

h1 { font-size: 24px; margin: 0 0 12px; }

p { color: var(--muted); margin: 0 0 16px; }

.field { display: block; margin-bottom: 14px; }

.field span { display: block; font-size: 14px; color: var(--muted); margin-bottom: 6px; }

input {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
  font-size: 18px;
}

input:focus { outline: 2px solid var(--cyan); border-color: transparent; }

#code { text-transform: uppercase; letter-spacing: .2em; text-align: center; }

.code {
  font-size: 32px; font-weight: 800; letter-spacing: .2em;
  color: var(--text); text-align: center; margin: 4px 0 20px;
}

.device { color: var(--text); font-weight: 600; font-size: 18px; }

.button {
  display: block; width: 100%;
  padding: 14px; margin-top: 10px;
  border-radius: 12px; border: 0;
  font-size: 16px; font-weight: 700; text-align: center;
  text-decoration: none; cursor: pointer;
}

.primary { color: #07080b; background: linear-gradient(90deg, var(--cyan), var(--blue) 60%, var(--violet)); }

.secondary { color: var(--text); background: transparent; border: 1px solid var(--line); }

.button:disabled { opacity: .6; cursor: progress; }

.error { color: var(--danger); }

.done { color: var(--text); font-size: 18px; }