:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #1b1d21;
  --muted: #6b7280;
  --line: #dfe2e7;
  --accent: #1a73e8;
  --danger: #b3261e;
  --danger-bg: #fdeceb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17191d;
    --card: #212429;
    --ink: #eceef1;
    --muted: #9aa1ac;
    --line: #343941;
    --accent: #8ab4f8;
    --danger: #f2b8b5;
    --danger-bg: #3a2422;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  width: 100%;
  max-width: 25rem;
  padding: 2.5rem 2rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  text-align: center;
}

h1 {
  margin: 0 0 .5rem;
  font-size: 1.5rem;
  letter-spacing: -.01em;
}

.lead { margin: 0 0 1.75rem; color: var(--muted); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .7rem;
  width: 100%;
  padding: .8rem 1rem;
  font: inherit;
  font-weight: 500;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color .15s, background-color .15s;
}

.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn:disabled { opacity: .6; cursor: progress; }
.btn__icon { width: 18px; height: 18px; flex: none; }

.status {
  margin: 1.25rem 0 0;
  padding: .75rem .9rem;
  font-size: .9rem;
  text-align: left;
  border-radius: 8px;
  background: var(--danger-bg);
  color: var(--danger);
}

.status[data-tone="info"] {
  background: transparent;
  color: var(--muted);
  text-align: center;
  padding: 0;
}

.hint {
  margin: 1.75rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: .85rem;
  color: var(--muted);
}

.hint a { color: var(--accent); }

.check {
  width: 3rem;
  height: 3rem;
  margin: 0 auto 1rem;
  display: grid;
  place-items: center;
  font-size: 1.6rem;
  color: #fff;
  background: #1e8e3e;
  border-radius: 50%;
}