:root {
  --bg: #0a0b0d;
  --surface: #111318;
  --border: #22262f;
  --text: #e8eaee;
  --muted: #8a93a3;
  --accent: #8ab4ff;
  --danger: #ff7a7a;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: max(20px, env(safe-area-inset-top)) 20px max(20px, env(safe-area-inset-bottom));
}
.card {
  width: 100%;
  max-width: 380px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 24px;
}
h1 { margin: 0; font-size: 20px; font-weight: 650; letter-spacing: -0.01em; }
.sub { margin: 4px 0 22px; color: var(--muted); font-size: 13px; }
label { display: block; margin: 14px 0 6px; font-size: 12px; color: var(--muted); }
input {
  width: 100%;
  height: 44px;
  padding: 0 12px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 9px;
  font: inherit;
  font-size: 16px;
}
input:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
#code { letter-spacing: 0.12em; font-variant-numeric: tabular-nums; }
button {
  width: 100%;
  height: 46px;
  margin-top: 20px;
  border: 0;
  border-radius: 9px;
  background: var(--accent);
  color: #0a0b0d;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: default; }
.error { margin: 14px 0 0; color: var(--danger); font-size: 13px; }