:root {
  --page: #f3f1ec;
  --card: #ffffff;
  --border: #dedad2;
  --text: #1f1f1d;
  --muted: #5f5c55;
  --band: #0d5c4b;
  --band-text: #ffffff;
  --accent: #0d5c4b;
  --accent-text: #ffffff;
  --accent-hover: #0a4a3c;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #151614;
    --card: #1f211e;
    --border: #353832;
    --text: #ecebe6;
    --muted: #a7a59e;
    --band: #0d5c4b;
    --band-text: #ffffff;
    --accent: #3fae8f;
    --accent-text: #0c1714;
    --accent-hover: #5cc3a5;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  padding: 48px 16px;
  background: var(--page);
  color: var(--text);
  font: 16px/1.5 "Segoe UI", system-ui, -apple-system, sans-serif;
}

.card {
  max-width: 520px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.band {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  background: var(--band);
  color: var(--band-text);
  font-weight: 600;
}

.mark {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.16);
  font-weight: 700;
}

.state { padding: 24px; }

h1 {
  margin: 0 0 8px;
  font-size: 22px;
  line-height: 1.25;
}

.lead { margin: 0 0 20px; color: var(--text); }

.button {
  display: inline-block;
  padding: 10px 18px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.button:hover { background: var(--accent-hover); }
.button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.help {
  margin: 16px 0 0;
  font-size: 14px;
  color: var(--muted);
}

.meta {
  margin: 20px 0 0;
  font-size: 13px;
  color: var(--muted);
}