:root {
  --board-border: #1c1c1c;
  --cell-line: rgba(0, 0, 0, 0.28);
  --region-line: #1c1c1c;
  --x-color: rgba(40, 40, 40, 0.7);
  --page-bg: #f6f7f9;
  --panel-bg: #ffffff;
  --text: #1f2328;
  --muted: #6b7280;
  --accent: #0a66c2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  background: var(--page-bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  padding: 24px 16px 48px;
}

.app {
  width: 100%;
  max-width: 520px;
}

header {
  text-align: center;
  margin-bottom: 16px;
}

header h1 {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: -0.5px;
}

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

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.toolbar .left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.timer {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 16px;
  color: var(--muted);
}

select,
button {
  font: inherit;
  border-radius: 8px;
  border: 1px solid #d0d5dd;
  background: var(--panel-bg);
  color: var(--text);
  padding: 8px 12px;
  cursor: pointer;
}

button:hover:not(:disabled),
select:hover {
  border-color: var(--accent);
}

button:disabled {
  opacity: 0.5;
  cursor: default;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.status {
  min-height: 24px;
  margin: 0 0 12px;
  text-align: center;
  font-size: 15px;
  font-weight: 600;
}

.status.error {
  color: #c02626;
}

.status.win {
  color: #1a7f37;
}

/* --- A tábla --- */
.board {
  display: grid;
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 3px solid var(--board-border);
  border-radius: 6px;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  /* Belső vékony rácsvonalak */
  border-right: 1px solid var(--cell-line);
  border-bottom: 1px solid var(--cell-line);
  cursor: pointer;
  overflow: hidden;
}

.cell.last-col {
  border-right: none;
}
.cell.last-row {
  border-bottom: none;
}

/* Vastag határvonalak a régiók között */
.cell.edge-top {
  border-top: 2px solid var(--region-line);
}
.cell.edge-bottom {
  border-bottom: 2px solid var(--region-line);
}
.cell.edge-left {
  border-left: 2px solid var(--region-line);
}
.cell.edge-right {
  border-right: 2px solid var(--region-line);
}

/* Jelölések */
.cell .mark {
  font-size: min(6vw, 30px);
  line-height: 1;
  pointer-events: none;
}

.cell .x-mark {
  color: var(--x-color);
  font-weight: 700;
}

.cell .queen {
  font-size: min(7.5vw, 38px);
  filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.25));
}

.cell.auto .x-mark {
  opacity: 0.45;
}

.cell.conflict {
  outline: 3px solid #d1242f;
  outline-offset: -3px;
  z-index: 2;
}

.cell:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: -3px;
  z-index: 3;
}

.hint {
  margin-top: 16px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.hint b {
  color: var(--text);
}