:root {
  color-scheme: light dark;
  --bg: #f7f4ee;
  --fg: #16312e;
  --muted: #546b68;
  --primary: #0f766e;
  --on-primary: #ffffff;
  --line: #d6d1c4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1413;
    --fg: #e8f1ef;
    --muted: #9bb0ad;
    --primary: #2dd4bf;
    --on-primary: #06201d;
    --line: #28403c;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
  background: var(--bg);
  color: var(--fg);
  font-family:
    system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    sans-serif;
  line-height: 1.5;
}

main {
  width: 100%;
  max-width: 420px;
  display: grid;
  gap: 16px;
}

h1 {
  margin: 0;
  font-size: 1.6rem;
}

p {
  margin: 0;
}

[hidden] {
  display: none !important;
}

#actions {
  display: grid;
  gap: 12px;
}

.button {
  display: block;
  width: 100%;
  min-height: 48px;
  padding: 12px 16px;
  border: 0;
  border-radius: 12px;
  background: var(--primary);
  color: var(--on-primary);
  font: inherit;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.button.secondary {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--line);
}

.note {
  color: var(--muted);
  font-size: 0.9rem;
}

#invalid {
  color: #b42318;
}

@media (prefers-color-scheme: dark) {
  #invalid {
    color: #fda29b;
  }
}