:root {
  --accent: #8b0000;
  --on-accent: #ffffff;
  --accent-border: #8b0000;
  --focus: #0b5394;

  --bg: #ffffff;
  --fg: #111111;
  --square-bg: #f2f2f2;
  --square-border: #555555;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #8b0000;
    --on-accent: #ffffff;
    --accent-border: #ff8a80;
    --focus: #8ec5ff;

    --bg: #121212;
    --fg: #f0f0f0;
    --square-bg: #262626;
    --square-border: #aaaaaa;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 1.125rem;
  line-height: 1.4;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 0.75rem;
}

h1 {
  margin: 0 0 1rem;
  text-align: center;
}

#status:empty {
  display: none;
}

.card {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.25rem;
}

.category {
  align-self: end;
  padding-bottom: 0.125rem;
  text-align: center;
  font-weight: 700;
  font-size: clamp(0.75rem, 3vw, 1.1rem);
  overflow-wrap: anywhere;
}

.square {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.125rem;
  aspect-ratio: 1;
  padding: 0.125rem;
  border: 2px solid var(--square-border);
  border-radius: 0.375rem;
  background: var(--square-bg);
  color: var(--fg);
  font: inherit;
  font-size: clamp(0.7rem, 2.6vw, 1.05rem);
  line-height: 1.2;
  overflow-wrap: anywhere;
  hyphens: auto;
  cursor: pointer;
  touch-action: manipulation;
}

.square[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent-border);
  color: var(--on-accent);
  font-weight: 700;
}

.note {
  max-width: 100%;
  font-style: italic;
  font-weight: 400;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  padding-inline: 0.2em;
}

.note:empty {
  display: none;
}

.square[aria-pressed="true"]:not(.has-note) .term::after {
  content: " ✓";
}

.square:focus-visible,
.new-card:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.new-card {
  display: block;
  margin: 1.5rem auto 0;
  padding: 0.5rem 1rem;
  border: 2px solid var(--square-border);
  border-radius: 0.375rem;
  background: transparent;
  color: var(--fg);
  font: inherit;
  cursor: pointer;
}