:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --line: #dddddd;
  --empty: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --text: #f2f2f2;
    --line: #333333;
    --empty: #1c1c1c;
  }
}

body {
  margin: 0;
  padding: 1rem;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
  margin-bottom: 1rem;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
}

header p {
  margin: 0;
  flex: 1 1 16rem;
}

button, input {
  font: inherit;
}

.swatch {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border-radius: 3px;
  flex-shrink: 0;
}

.me {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

.me[hidden] {
  display: none;
}

.me-edit {
  opacity: 0.6;
  font-size: 0.85rem;
}

main {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  align-items: flex-start;
}

/* A two-dimensional grid of equal squares: a job for grid, not flexbox */
#wall {
  flex: 1 1 36rem;
  display: grid;
  grid-template-columns: repeat(32, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  touch-action: none; /* let a finger draw instead of scrolling the page */
  user-select: none;
}

#wall button {
  aspect-ratio: 1;
  border: 0;
  padding: 0;
  background: var(--empty);
  cursor: pointer;
}

aside {
  flex: 1 1 14rem;
  max-width: 20rem;
}

h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

#leaderboard {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: rank;
}

#leaderboard li {
  counter-increment: rank;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--line);
}

#leaderboard li::before {
  content: counter(rank);
  width: 1.5rem;
  opacity: 0.6;
}

#leaderboard li.is-me {
  font-weight: 600;
}

.board-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.board-count {
  font-variant-numeric: tabular-nums;
}

#status {
  font-size: 0.85rem;
  opacity: 0.7;
}

dialog {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.5rem;
  background: var(--bg);
  color: var(--text);
  width: min(22rem, calc(100vw - 2rem));
  box-sizing: border-box;
}

dialog::backdrop {
  background: rgb(0 0 0 / 0.6);
}

dialog form {
  display: grid;
  gap: 1rem;
}

dialog label {
  display: grid;
  gap: 0.35rem;
}

dialog input[type="text"] {
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--empty);
  color: var(--text);
}

dialog input[type="color"] {
  width: 100%;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

dialog button[type="submit"] {
  padding: 0.6rem;
  border: 0;
  border-radius: 6px;
  background: var(--text);
  color: var(--bg);
  cursor: pointer;
}