* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial;
  background: #f6f7f9;
  color: #111;
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.boardCard {
  width: 620px;
  background: #fff;
  border: 1px solid #e2e2e2;
  border-radius: 16px;
  box-shadow: 0 18px 48px rgba(0,0,0,0.08);
  overflow: hidden;
}

.boardHeader {
  padding: 14px 16px;
  border-bottom: 1px solid #eee;
  display: flex;
  justify-content: center;
}

.boardTitle {
  font-weight: 750;
  letter-spacing: 0.2px;
  font-size: 16px;
}

.boardStage {
  position: relative;
  padding: 16px;
}

/* Center board + eval bar as one unit */
.boardRow {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 12px;
}

/* Ensures board has its own clean container */
.boardWrap {
  width: 520px;
  height: 520px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid #ddd;
  background: white;
}

.board {
  width: 520px;
  height: 520px;

  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
}

.square {
  position: relative;
  user-select: none;
}

.light { background: #f0d9b5; }
.dark  { background: #b58863; }

.square.highlight {
  outline: 3px solid rgba(90, 140, 255, 0.72);
  outline-offset: -3px;
}

.piece {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  cursor: pointer;
}

.piece img {
  width: 88%;
  height: 88%;
  object-fit: contain;
  pointer-events: none;
}

/* Eval bar */
.evalCol {
  width: 44px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.evalTrack {
  width: 16px;
  height: 520px;
  border-radius: 999px;
  background: #111;
  overflow: hidden;
  border: 1px solid #ddd;
  position: relative;
}

.evalFill {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background: #fff;
}

.evalText {
  font-variant-numeric: tabular-nums;
  font-weight: 650;
  font-size: 13px;
  color: #111;
}

/* Status line */
.status {
  padding: 12px 16px;
  border-top: 1px solid #eee;
  font-size: 13px;
  color: #333;
  text-align: center;
}

/* Overlay covers FULL boardStage cleanly */
.overlay {
  position: absolute;
  inset: 16px; /* exactly matches boardStage padding */
  display: grid;
  place-items: center;
  background: rgba(255,255,255,0.70);
  backdrop-filter: blur(6px);
  border-radius: 12px;
}

.overlay.hidden {
  display: none;
}

.overlayBox {
  width: 280px;
  background: #fff;
  border: 1px solid #e2e2e2;
  border-radius: 14px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.15);
  padding: 16px;
  text-align: center;
}

.overlayTitle {
  font-weight: 750;
  margin-bottom: 12px;
}

.overlayBtns {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.btn {
  padding: 10px 12px;
  border: 1px solid #ddd;
  background: white;
  border-radius: 10px;
  cursor: pointer;
}

.btn:hover {
  background: #f1f1f1;
}

.btnSecondary {
  background: #111;
  color: #fff;
  border-color: #111;
}

.btnSecondary:hover {
  background: #2a2a2a;
}

/* Responsive */
@media (max-width: 700px) {
  .boardCard { width: min(620px, 95vw); }

  .boardWrap {
    width: min(520px, 82vw);
    height: min(520px, 82vw);
  }

  .board {
    width: 100%;
    height: 100%;
  }

  .evalTrack {
    height: min(520px, 82vw);
  }
}