:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c2330;
  --muted: #5b6575;
  --line: #d9dde4;
  --accent: #2f5bd3;
  --accent-text: #ffffff;
  --error: #b42318;
  --badge-bg: #e8eefc;
  --badge-text: #2448a8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b;
    --card: #1b2029;
    --text: #e8ebf0;
    --muted: #a3acba;
    --line: #313847;
    --accent: #6d8ff0;
    --accent-text: #0d1222;
    --error: #ff8a80;
    --badge-bg: #23304f;
    --badge-text: #b9c9f7;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.card {
  width: 100%;
  max-width: 520px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 36px 40px;
}
.badge {
  display: inline-block;
  margin: 0 0 16px;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
h1 { margin: 0 0 12px; font-size: 24px; line-height: 1.3; }
.lead { margin: 0 0 28px; color: var(--muted); }
label { display: block; margin-bottom: 6px; font-size: 14px; font-weight: 600; }
.row { display: flex; gap: 10px; }
input {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font: inherit;
  letter-spacing: 0.04em;
}
input:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button {
  padding: 10px 20px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: progress; }
.progress { display: flex; align-items: center; gap: 12px; font-weight: 600; }
.progress[hidden] { display: none; }
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } }
.message { min-height: 1.55em; margin: 14px 0 0; color: var(--muted); }
.message.error { color: var(--error); }