:root {
  --bg: #e9ecef;
  --text: #212529;
  --panel: #c0c0c0;
  --light: #fff;
  --dark: #808080;
  --cell: 28px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #1b1d21; --text: #e6e6e6; }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.4 system-ui, sans-serif;
}
main {
  max-width: 100%;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
h1 { margin: 8px 0 0; font-size: 1.6rem; }

.controls { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; justify-content: center; }
select { font: inherit; padding: 4px 8px; }

.game {
  max-width: 100%;
  background: var(--panel);
  padding: 8px;
  border: 3px solid;
  border-color: var(--light) var(--dark) var(--dark) var(--light);
}
.bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px;
  margin-bottom: 8px;
  border: 2px solid;
  border-color: var(--dark) var(--light) var(--light) var(--dark);
}
.lcd {
  background: #000;
  color: #f22;
  font: bold 24px/1 ui-monospace, "Courier New", monospace;
  padding: 3px 4px;
  letter-spacing: 2px;
  min-width: 3.4ch;
}
#face {
  font-size: 22px;
  width: 38px;
  height: 38px;
  padding: 0;
  background: var(--panel);
  border: 3px solid;
  border-color: var(--light) var(--dark) var(--dark) var(--light);
  cursor: pointer;
}
#face:active { border-color: var(--dark) var(--light) var(--light) var(--dark); }

.scroll { overflow-x: auto; max-width: calc(100vw - 54px); }
#board {
  display: grid;
  grid-template-columns: repeat(var(--cols), var(--cell));
  width: max-content;
  border: 3px solid;
  border-color: var(--dark) var(--light) var(--light) var(--dark);
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}
.cell {
  width: var(--cell);
  height: var(--cell);
  padding: 0;
  margin: 0;
  font: bold 16px/1 system-ui, sans-serif;
  color: #000;
  background: var(--panel);
  border: 3px solid;
  border-color: var(--light) var(--dark) var(--dark) var(--light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cell.open {
  border: 1px solid var(--dark);
  border-width: 0 1px 1px 0;
  background: #bdbdbd;
  cursor: default;
}
.cell.boom { background: #f33; }
.cell.wrong { background: #fcc; }
.n1 { color: #0000ff; } .n2 { color: #008000; } .n3 { color: #ff0000; } .n4 { color: #000080; }
.n5 { color: #800000; } .n6 { color: #008080; } .n7 { color: #000; }     .n8 { color: #808080; }

.help { max-width: 34rem; text-align: center; opacity: .75; font-size: 13px; margin: 0; }
kbd { border: 1px solid currentColor; border-radius: 3px; padding: 0 4px; font-size: 12px; }

@media (max-width: 420px) {
  :root { --cell: 32px; }
}