:root {
  color-scheme: dark;
  --bg: #050505;
  --text: #f5f5f3;
  --muted: #8a8a86;
  --field: #0c0c0c;
  --line: #3a3a38;
  --accent: #e4d3b4;
  --ink: #16130f;
  --danger: #e7a394;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px 20px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 "Segoe UI", sans-serif;
}
main { width: min(420px, 100%); text-align: center; }
.mark {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}
h1 {
  margin: 0 0 28px;
  font-size: 36px;
  font-weight: 650;
  letter-spacing: -0.035em;
}
.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}
input, button {
  width: 100%;
  height: 48px;
  border-radius: 6px;
  font: inherit;
}
input {
  display: block;
  border: 1px solid var(--line);
  background: var(--field);
  color: var(--text);
  padding: 0 14px;
  text-align: center;
  letter-spacing: 0.03em;
}
input::placeholder { color: #6e6e6a; }
input:focus { outline: 2px solid #4a4336; border-color: #8a7b62; }
button {
  margin-top: 12px;
  border: 0;
  background: var(--accent);
  color: var(--ink);
  font-weight: 650;
  cursor: pointer;
}
button:disabled { opacity: 0.55; cursor: wait; }
#status {
  min-height: 1.4em;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 14px;
}
#status.bad { color: var(--danger); }
@media (max-width: 480px) {
  h1 { font-size: 30px; }
}