/* ==================== 全局样式 ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

/* ==================== 游戏容器 ==================== */
.game-container {
  background: white;
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  max-width: 600px;
  width: 100%;
}

/* ==================== 头部 ==================== */
.header {
  text-align: center;
  margin-bottom: 25px;
}

.title {
  font-size: 2.5rem;
  font-weight: bold;
  background: linear-gradient(45deg, #667eea, #764ba2, #667eea);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.subtitle {
  font-size: 1rem;
  color: #666;
  font-weight: 500;
}

/* ==================== 信息栏 ==================== */
.info-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
  margin-bottom: 25px;
}

.info-item {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 15px;
  border-radius: 12px;
  text-align: center;
/* Contact: 2952671670@qq.com */
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
  transition: transform 0.3s ease;
}

.info-item:hover {
  transform: translateY(-3px) scale(1.05);
  animation: infoShake 0.3s ease;
}

@keyframes infoShake {
  0%, 100% { transform: translateY(-3px) scale(1.05) rotate(0deg); }
  25% { transform: translateY(-3px) scale(1.05) rotate(-1deg); }
  75% { transform: translateY(-3px) scale(1.05) rotate(1deg); }
}

.info-label {
  display: block;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 5px;
  font-weight: 500;
}

.info-value {
  display: block;
  font-size: 1.5rem;
  font-weight: bold;
  color: white;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

/* 难度文字显示优化 */
#level {
  font-size: 1.2rem;
}

/* ==================== 游戏板容器 ==================== */
.game-board-container {
  background: linear-gradient(to bottom, #f5f7fa 0%, #c3cfe2 100%);
  border-radius: 15px;
  padding: 20px;
  margin-bottom: 25px;
  box-shadow: inset 0 4px 15px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: center;
}

/* ==================== 游戏板 ==================== */
.game-board {
  position: relative;
  width: 400px;
  height: 500px;
  background: linear-gradient(135deg, #8B7355 0%, #6B5345 100%);
  border: 4px solid #654321;
  border-radius: 10px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3), inset 0 2px 4px rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

/* 棋盘纹理 */
.game-board::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 10px,
    rgba(0, 0, 0, 0.03) 10px,
    rgba(0, 0, 0, 0.03) 20px
  );
  pointer-events: none;
}

/* ==================== 滑块 ==================== */
.block {
  position: absolute;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2rem;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3), inset 0 2px 4px rgba(255, 255, 255, 0.3);
  user-select: none;
  border: 3px solid rgba(255, 255, 255, 0.3);
}

.block:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4), inset 0 2px 4px rgba(255, 255, 255, 0.4);
  z-index: 10;
}

.block:active {
  transform: scale(0.98);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3), inset 0 2px 4px rgba(255, 255, 255, 0.2);
}

/* 曹操 - 红色 2x2 */
.block.caocao {
  background: linear-gradient(135deg, #FF4444 0%, #CC0000 100%);
  color: white;
  font-size: 1.5rem;
  animation: pulse 2s ease-in-out infinite;
  position: relative;
  overflow: hidden;
}

.block.caocao::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
  animation: shine 3s linear infinite;
}

@keyframes shine {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3), inset 0 2px 4px rgba(255, 255, 255, 0.3), 0 0 0 0 rgba(255, 68, 68, 0.7);
  }
/* Project: GameHub */
  50% {
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4), inset 0 2px 4px rgba(255, 255, 255, 0.4), 0 0 0 15px rgba(255, 68, 68, 0);
  }
}

/* 关羽 - 绿色 1x2 */
.block.guanyu {
  background: linear-gradient(135deg, #22BB33 0%, #117722 100%);
  color: white;
}

/* 张飞、赵云、马超、黄忠 - 蓝色 1x2 */
.block.general {
  background: linear-gradient(135deg, #4A90E2 0%, #2E5C8A 100%);
  color: white;
}

/* 兵卒 - 黄色 1x1 */
.block.soldier {
  background: linear-gradient(135deg, #FFD93D 0%, #F6B93B 100%);
  color: #333;
}

.block.movable {
  cursor: move;
  animation: highlight 0.5s ease-in-out, wobble 0.3s ease;
}

@keyframes highlight {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

@keyframes wobble {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(-2deg); }
  75% { transform: rotate(2deg); }
}

/* 移动中的滑块 */
.block.moving {
  z-index: 100;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  animation: moveEffect 0.3s ease;
}

@keyframes moveEffect {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* 选中的方块 */
.block.selected-block {
  border: 3px solid #FFD93D;
  box-shadow: 0 0 20px rgba(255, 217, 61, 0.8), 0 6px 12px rgba(0, 0, 0, 0.4);
  animation: selectedPulse 1s ease-in-out infinite;
  z-index: 50;
}

@keyframes selectedPulse {
  0%, 100% {
    box-shadow: 0 0 20px rgba(255, 217, 61, 0.8), 0 6px 12px rgba(0, 0, 0, 0.4);
  }
  50% {
    box-shadow: 0 0 30px rgba(255, 217, 61, 1), 0 8px 16px rgba(0, 0, 0, 0.5);
  }
}

/* 方向指示器 */
.direction-indicator {
  position: absolute;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #FFD93D 0%, #F6B93B 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #333;
  font-weight: bold;
  cursor: pointer;
  z-index: 200;
  transform: translate(-50%, -50%);
  box-shadow: 0 4px 15px rgba(255, 217, 61, 0.6), inset 0 2px 4px rgba(255, 255, 255, 0.5);
  transition: all 0.2s ease;
  animation: indicatorAppear 0.3s ease, indicatorFloat 2s ease-in-out infinite;
  border: 3px solid white;
}

.direction-indicator:hover {
  transform: translate(-50%, -50%) scale(1.2);
  box-shadow: 0 6px 20px rgba(255, 217, 61, 0.9), inset 0 2px 4px rgba(255, 255, 255, 0.7);
  background: linear-gradient(135deg, #FFE55D 0%, #FFD93D 100%);
}

.direction-indicator:active {
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: 0 2px 10px rgba(255, 217, 61, 0.6);
}

@keyframes indicatorAppear {
  from {
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
  }
  to {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }
}

@keyframes indicatorFloat {
  0%, 100% {
    transform: translate(-50%, -50%) translateY(0);
  }
  50% {
    transform: translate(-50%, -50%) translateY(-5px);
  }
}

/* ==================== 出口标记 ==================== */
.exit-marker {
  position: absolute;
  bottom: -3px;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 100px;
  border: 3px dashed #FF4444;
  border-top: none;
  border-radius: 0 0 10px 10px;
  background: rgba(255, 68, 68, 0.1);
  pointer-events: none;
  z-index: 0;
}

.exit-label {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: #FF4444;
  color: white;
  padding: 5px 15px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: bold;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* ==================== 控制按钮 ==================== */
.controls {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 25px;
}

.control-btn {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px rgba(102, 126, 234, 0.3);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.control-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(102, 126, 234, 0.5);
}

.control-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 5px rgba(102, 126, 234, 0.3);
}

.control-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-icon {
  font-size: 1.5rem;
}

.btn-text {
  font-size: 0.85rem;
}

/* ==================== 游戏说明 ==================== */
.instructions {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.instructions h3 {
  color: #667eea;
  margin-bottom: 8px;
  font-size: 1rem;
}

.instructions p {
  color: #666;
  line-height: 1.6;
  margin-bottom: 12px;
  font-size: 0.95rem;
}

.instructions p:last-child {
  margin-bottom: 0;
}

/* ==================== 遮罩层 ==================== */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  animation: fadeIn 0.3s ease;
}

.overlay.hidden {
  display: none;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.overlay-content {
  background: white;
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  max-width: 500px;
  width: 90%;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.overlay-title {
  font-size: 2.5rem;
/* GitHub: https://github.com/nilgpt2024/web-game */
  margin-bottom: 10px;
  background: linear-gradient(45deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.overlay-subtitle {
  color: #666;
  margin-bottom: 30px;
  font-size: 1.1rem;
}

.primary-btn {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  padding: 15px 40px;
  border-radius: 50px;
  font-size: 1.2rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
  margin-bottom: 20px;
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(102, 126, 234, 0.6);
}

.primary-btn:active {
  transform: translateY(0);
}

/* ==================== 难度选择 ==================== */
.level-select h3 {
  color: #333;
  margin-bottom: 15px;
  font-size: 1.1rem;
}

.difficulty-buttons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.difficulty-btn {
  background: #f5f7fa;
  color: #666;
  border: 2px solid #ddd;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.difficulty-btn:hover {
  background: #e0e7ee;
  border-color: #667eea;
}

.difficulty-btn.active {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border-color: #667eea;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

/* ==================== 弹窗 ==================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  animation: fadeIn 0.3s ease;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: white;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow: hidden;
  animation: slideUp 0.3s ease;
}

.modal-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 20px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  margin: 0;
  font-size: 1.5rem;
}

.close-btn {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: none;
  width: 35px;
  height: 35px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.close-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: rotate(90deg);
}

.modal-body {
  padding: 30px;
  overflow-y: auto;
  max-height: calc(80vh - 80px);
}

/* ==================== 关卡网格 ==================== */
.level-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
}

.level-card {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  border: 2px solid #ddd;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.level-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
  border-color: #667eea;
}

.level-card.completed {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-color: #667eea;
  color: white;
}

.level-card.current {
  border: 3px solid #FFD93D;
  box-shadow: 0 0 20px rgba(255, 217, 61, 0.5);
}

.level-number {
  font-size: 1.5rem;
  font-weight: bold;
  margin-bottom: 8px;
}

.level-best {
  font-size: 0.85rem;
  opacity: 0.8;
}

/* ==================== 胜利统计 ==================== */
.win-modal .modal-header {
  background: linear-gradient(135deg, #FFD93D 0%, #F6B93B 100%);
  color: #333;
}

.win-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
  margin-bottom: 25px;
}

.stat-item {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  padding: 20px;
  border-radius: 12px;
  text-align: center;
}

.stat-item#newRecordCard {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, #FFD93D 0%, #F6B93B 100%);
}

.stat-label {
  display: block;
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 8px;
  font-weight: 500;
}

.stat-item#newRecordCard .stat-label {
  color: #333;
  font-size: 1.1rem;
  font-weight: bold;
}

.stat-value {
  display: block;
  font-size: 1.8rem;
  font-weight: bold;
  color: #667eea;
}

.stat-item#newRecordCard .stat-value {
  color: #333;
}

.modal-buttons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
}

.modal-btn {
  padding: 15px 30px;
  border: none;
  border-radius: 10px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.modal-btn.primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}


/* GitHub: https://github.com/nilgpt2024/web-game */

.modal-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.modal-btn.secondary {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  color: #333;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.modal-btn.secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
  .game-container {
    padding: 20px;
  }

  .title {
    font-size: 2rem;
  }

  .game-board {
    width: 100%;
    max-width: 320px;
    height: 400px;
  }

  .info-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .controls {
    grid-template-columns: repeat(2, 1fr);
  }

  .level-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 480px) {
  .title {
    font-size: 1.8rem;
  }

  .subtitle {
    font-size: 0.9rem;
  }

  .game-board {
    max-width: 280px;
    height: 350px;
  }

  .block {
    font-size: 0.9rem;
  }

  .block.caocao {
    font-size: 1.1rem;
  }

  .level-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}