:root {
  color-scheme: light;
}

body {
  background: #0f172a;
  color: #f8fafc;
}

.chess-page {
  max-width: 520px;
  margin: 0 auto;
  padding: 72px 16px 48px;
  text-align: center;
}

.chess-hero h1 {
  font-size: clamp(28px, 5vw, 36px);
  margin-bottom: 8px;
}

.subtitle {
  color: #94a3b8;
  margin-bottom: 24px;
}

.chess-board {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.turn {
  font-weight: 600;
  color: #e2e8f0;
}

.board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  width: min(100%, 520px);
  border: 2px solid #1e293b;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.35);
}

.square {
  width: clamp(42px, 8vw, 60px);
  height: clamp(42px, 8vw, 60px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(24px, 4vw, 36px);
  cursor: pointer;
  user-select: none;
}

.square.light {
  background: #e5e7eb;
  color: #0f172a;
}

.square.dark {
  background: #64748b;
  color: #0f172a;
}

.square.selected {
  outline: 3px solid #f59e0b;
  outline-offset: -3px;
}

.square.legal {
  outline: 3px dashed rgba(245, 158, 11, 0.8);
  outline-offset: -3px;
}

.reset {
  background: #f59e0b;
  border: none;
  color: #0f172a;
  font-weight: 700;
  padding: 10px 16px;
  border-radius: 10px;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.reset:hover {
  opacity: 0.85;
}

@media (max-width: 600px) {
  .chess-page {
    padding-top: 64px;
  }
}