:root {
  --bg: #f7f7f5;
  --card: #ffffff;
  --text: #1d1d1b;
  --muted: #5f5f5a;
  --line: #deded8;
  --accent: #1f4e79;
  --accent-text: #ffffff;
  --error: #a4262c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --card: #20201e;
    --text: #ececea;
    --muted: #a5a5a0;
    --line: #3a3a37;
    --accent: #6ea8dc;
    --accent-text: #0e1a26;
    --error: #ff8a8f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
main {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px 24px;
}
h1 { margin: 0 0 16px; font-size: 1.25rem; letter-spacing: 0.01em; }
label { display: block; font-weight: 600; margin: 12px 0 6px; }
input {
  width: 100%;
  padding: 10px 12px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}
#code { letter-spacing: 0.3em; font-size: 1.25rem; }
button {
  margin-top: 16px;
  padding: 10px 18px;
  font: inherit;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 8px;
  cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: wait; }
button.secondary { color: var(--text); background: transparent; border-color: var(--line); }
button.link { color: var(--accent); background: none; border: none; padding: 0; font-weight: 400; }
.buttons { display: flex; gap: 12px; }
.ask { font-size: 1.05rem; }
ul { padding-left: 20px; color: var(--muted); }
.who { color: var(--muted); font-size: 0.9rem; }
#error { color: var(--error); margin: 16px 0 0; }
footer { margin-top: 16px; color: var(--muted); font-size: 0.85rem; }
footer a { color: inherit; }