/* General body styles */
body {
  background: linear-gradient(135deg, #1a1a2e, #16213e, #0f3460);
  color: #eee;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  text-align: center;
  margin: 0;
  padding: 0;
  user-select: none;
}

/* Page heading */
h1 {
  margin-top: 25px;
  font-size: 3rem;
  font-weight: 700;
  color: #ffd500;
  text-shadow: 1.5px 1.5px 6px rgba(255, 213, 0, 0.7);
}

/* Chess board container */
.chess-board {
  display: grid;
  grid-template-columns: repeat(8, 90px);
  grid-template-rows: repeat(8, 90px);
  width: 720px;
  height: 720px;
  margin: 15px auto;
  border-radius: 15px;
  border: 5px solid #ffd500;
  box-shadow:
    0 0 15px rgba(255, 213, 0, 0.6),
    inset 0 0 10px rgba(0, 0, 0, 0.6);
  background: linear-gradient(45deg, #1b2735, #182635);
  overflow: hidden;
}

/* Each square on the board */
.square {
  width: 90px;
  height: 90px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 3rem;
  cursor: pointer;
  transition:
    background-color 0.3s ease,
    box-shadow 0.25s ease,
    transform 0.15s ease;
  border-radius: 8px;
  box-shadow: 0 0 3px rgba(0,0,0,0.3);
}

/* Light squares */
.white {
  background: linear-gradient(145deg, #e6e8ea, #c7ccd1);
  box-shadow:
    inset 2px 2px 5px #ffffff,
    inset -5px -5px 10px #b1b6bd;
  color: #505050;
}

/* Dark squares */
.black {
  background: linear-gradient(145deg, #2e3440, #1e222b);
  box-shadow:
    inset 2px 2px 5px #1c2028,
    inset -5px -5px 10px #313742;
  color: #d3d3d3;
}

/* Hover effect on squares */
.square:hover {
  filter: brightness(1.15);
  transform: scale(1.05);
  box-shadow:
    0 0 10px #ffd500,
    inset 0 0 10px #ffd500;
}

/* Highlight selected square */
.selected {
  outline: 3px solid #ffd500;
  box-shadow:
    0 0 15px #ffd500,
    inset 0 0 10px #ffd500;
}

/* White pieces style */
.white-piece {
  color: #2b2b2b;
  text-shadow:
    0 0 4px #fff,
    0 0 6px #f5f5f5;
}

/* Black pieces style */
.black-piece {
  color: #f0f0f0;
  text-shadow:
    0 0 3px #000,
    0 0 6px #555;
}