body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  text-align: center;
  background-color: #A9A9A9;
  color: white;
  margin: 0;
  padding: 20px;
  min-height: 100vh;
}

header {
  margin-bottom: 20px;
}

h1 {
  margin: 0;
  font-size: 2.5rem;
  color: black;
}

.subtitle {
  color: rgb(40, 39, 39);
  font-size: 1.2rem;
  margin-top: 5px;
}

.game-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
}

.board-section {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.board-header {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin-bottom: 15px;
}

#status {
  background: rgba(0, 0, 0, 0.4);
  padding: 10px 20px;
  border-radius: 30px;
  font-weight: bold;
  font-size: 1.2rem;
  min-width: 200px;
}

#board {
  display: grid;
  background-color: #f0d9b5;
  grid-template-columns: repeat(8, 65px);
  grid-template-rows: repeat(8, 65px);
  width: 520px;
  height: 520px;
  margin: 0 auto;
  border: 3px solid #34495e;
  border-radius: 5px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
}
.box {
  width: 65px;
  height: 65px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: background-color 0.3s;
}

.coordinates {
  position: absolute;
  font-size: 14px;
  font-weight: bold;
  color: rgba(255, 255, 255, 0.7);
  z-index: 2;
}

.file-coords {
  bottom: -25px;
  width: 100%;
  display: flex;
  justify-content: space-around;
  padding: 0 5px;
}

.rank-coords {
  left: -25px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
}



.white {
  background-color: #f0d9b5;
}

.black {
  background-color: #b58863;
}

.box.highlight {
  background-color: #aec6cf;
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.3);
}

.box.last-move {
  background-color: rgba(155, 199, 0, 0.41);
}

.box.valid-move::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  background-color: rgba(0, 0, 0, 0.3);
  border-radius: 50%;
  z-index: 1;
}

.box.capture::after {
  width: 100%;
  height: 100%;
  border: 5px solid rgba(0, 0, 0, 0.3);
  background: transparent;
  border-radius: 0;
  box-sizing: border-box;
}

.piece {
  font-size: 48px;
  cursor: grab;
  position: relative;
  z-index: 3;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  transition: transform 0.2s;
}

.piece.dragging {
  opacity: 0.8;
  transform: scale(1.1);
  z-index: 10;
}

.bl {
  color: #2c3e50;
}

.wh {
  color: #ecf0f1;
}

.controls {
  background: rgba(44, 62, 80, 0.7);
  border-radius: 15px;
  padding: 25px;
  width: 300px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.control-group {
  color: white;
  background: rgba(25, 42, 58, 0.8);
  padding: 15px;
  border-radius: 10px;
}

h2 {
  margin-top: 0;
  color: #3498db;
  font-size: 1.4rem;
  border-bottom: 2px solid #3498db;
  padding-bottom: 8px;
}

.buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

button {
  background: linear-gradient(to right, #3498db, #2ecc71);
  color: white;
  border: none;
  padding: 12px;
  font-size: 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s;
  font-weight: bold;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

button:active {
  transform: translateY(0);
}

select,
input {
  width: 100%;
  padding: 10px;
  background: #34495e;
  color: white;
  border: 1px solid #3498db;
  border-radius: 5px;
  margin-top: 8px;
}

label {
  display: block;
  text-align: left;
  margin-bottom: 15px;
}

.slider-container {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-value {
  min-width: 30px;
  font-weight: bold;
  color: #2ecc71;
}

.history {
  max-height: 300px;
  overflow-y: auto;
  background: rgba(25, 42, 58, 0.8);
  color: white;
  border-radius: 10px;
  padding: 15px;
  text-align: left;
}

.history h2 {
  margin-top: 0;
}

.history div {
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.history div:last-child {
  border-bottom: none;
}

.game-over {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s;
}

.game-over.active {
  opacity: 1;
  pointer-events: all;
}

.game-over-content {
  background: linear-gradient(135deg, #1a1a2e, #16213e);
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  max-width: 500px;
  width: 90%;
  border: 2px solid #3498db;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.game-over h2 {
  font-size: 2rem;
  color: #e74c3c;
  border: none;
  margin-top: 0;
}

#gameResult {
  font-size: 1.8rem;
  margin: 20px 0;
  color: #2ecc71;
}

@media (max-width: 900px) {
  .game-container {
    flex-direction: column;
    align-items: center;
  }

  #board {
    width: 85vw;
    height: 85vw;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
  }

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

  .piece {
    font-size: 6vw;
  }
}