/* ==================== CSS变量 ==================== */
:root {
  --primary-color: #ff6b6b;
  --primary-dark: #ee5a52;
  --secondary-color: #4ecdc4;
  --success-color: #48bb78;
  --warning-color: #f6e05e;
  --info-color: #4299e1;
  
  --bg-gradient-start: #ff6b6b;
  --bg-gradient-end: #feca57;
  
  --card-bg: #ffffff;
  --card-shadow: rgba(0, 0, 0, 0.1);
  --card-shadow-hover: rgba(0, 0, 0, 0.2);
  
  --text-primary: #2d3748;
  --text-secondary: #4a5568;
  --text-light: #a0aec0;
  --text-white: #ffffff;
  
  --border-radius: 16px;
  --border-radius-sm: 8px;
  --border-radius-lg: 24px;
  
  --transition: all 0.3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  color: var(--text-primary);
  line-height: 1.6;
}

/* ==================== 容器 ==================== */
.container {
  width: 100%;
  max-width: 1200px;
  background: var(--card-bg);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  padding: 40px;
  animation: fadeIn 0.6s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==================== 头部 ==================== */
.game-header {
  text-align: center;
  margin-bottom: 30px;
}

.header-icon {
  font-size: 4rem;
  animation: bounce 2s infinite;
  display: inline-block;
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.game-title {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 15px 0 10px;
}

.game-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* ==================== 统计信息 ==================== */
.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  margin: 30px 0;
}

.stat-card {
  background: linear-gradient(135deg, #f6f8fb, #e9ecef);
  border-radius: var(--border-radius);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 15px;
  box-shadow: 0 4px 15px var(--card-shadow);
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px var(--card-shadow-hover);
}

.stat-icon {
  font-size: 2.5rem;
}

.stat-content {
  flex: 1;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 5px;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
}

/* ==================== 难度选择 ==================== */
.difficulty-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  margin: 25px 0;
  padding: 20px;
  background: linear-gradient(135deg, #faf5ff, #f3f4f6);
  border-radius: var(--border-radius);
}

.difficulty-label {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.difficulty-buttons {
  display: flex;
  gap: 10px;
}

.difficulty-btn {
  padding: 10px 20px;
  border: 2px solid #e2e8f0;
  background: white;
  border-radius: var(--border-radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-primary);
}

.difficulty-btn:hover {
  border-color: var(--primary-color);
  background: #fef5f5;
  transform: translateY(-2px);
}

.difficulty-btn.active {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  border-color: var(--primary-color);
  box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

/* ==================== 游戏区域 ==================== */
.game-area {
  margin: 30px 0;
  display: flex;
  justify-content: center;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
  padding: 30px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  border-radius: var(--border-radius);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.square {
  width: 100%;
  min-height: 120px;
  aspect-ratio: 1;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.05));
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  line-height: 1;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
  position: relative;
/* Made with love by SinceraXY */
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.square::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
  opacity: 0;
  transition: var(--transition);
}

.square:hover {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.25), rgba(255, 255, 255, 0.1));
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.square:hover::before {
  opacity: 1;
}

.square:active {
  transform: scale(0.95) translateY(0);
}

/* Emoji 出现时的样式 */
.square.emoji {
  background: linear-gradient(135deg, #ffd93d, #ffb700);
  border-color: #ffb700;
  animation: emojiAppear 0.3s ease-out;
  box-shadow: 0 8px 25px rgba(255, 183, 0, 0.6);
}

@keyframes emojiAppear {
  from {
    transform: scale(0);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.square.emoji:hover {
  transform: scale(1.05);
}

.square.hit {
  animation: hit 0.4s ease-out;
}

@keyframes hit {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1) rotate(5deg);
    background: linear-gradient(135deg, #48bb78, #38a169);
    border-color: #48bb78;
  }
  100% {
    transform: scale(1);
  }
}

/* ==================== 控制按钮 ==================== */
.controls {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 30px;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;

/* Made with love */

  font-size: 1rem;
  font-weight: 600;
  padding: 14px 28px;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 15px var(--card-shadow);
  color: white;
  min-width: 150px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

.btn-secondary {
  background: linear-gradient(135deg, #718096, #4a5568);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(113, 128, 150, 0.4);
}

.btn-info {
  background: linear-gradient(135deg, var(--info-color), #3182ce);
}

.btn-info:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(66, 153, 225, 0.4);
}

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

.btn-icon {
  font-size: 1.2rem;
}

.hide {
  display: none !important;
}

/* ==================== 游戏结束弹窗 ==================== */
.modal {
  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: 1000;
  animation: modalFadeIn 0.3s ease-out;
}

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

.modal-content {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: 50px 40px;
  text-align: center;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  animation: modalSlideIn 0.4s ease-out;
}

@keyframes modalSlideIn {
  from {
    transform: translateY(-50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-icon {
  font-size: 5rem;
  animation: modalIconBounce 0.6s ease-out;
}
/* QQ: 2952671670 */

@keyframes modalIconBounce {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
}

.modal-title {
  font-size: 2rem;
  color: var(--text-primary);
  margin: 20px 0;
}

.modal-score {
  margin: 30px 0;
}

/* QQ: 2952671670 */

.modal-label {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.modal-value {
  font-size: 4rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.modal-message {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin: 20px 0 30px;
}

.modal-content .btn {
  display: inline-flex;
  margin: 0 auto;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
  .container {
    padding: 30px 20px;
  }
  
  .game-title {
    font-size: 2rem;
  }
  
  .header-icon {
    font-size: 3rem;
  }

/* Project: https://github.com/nilgpt2024/web-game */
  
  .stats-container {
    grid-template-columns: 1fr;
  }
  
  .difficulty-container {
    flex-direction: column;
    gap: 10px;
  }
  
  .grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    padding: 20px;
  }
  
  .square {
    min-height: 90px;
    font-size: 3rem;
  }
  
  .controls {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 20px 15px;
  }
  
  .game-title {
    font-size: 1.6rem;
  }
  
  .stat-value {
    font-size: 1.5rem;
  }
  
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .square {
    min-height: 70px;
    font-size: 2.5rem;
  }
  
  .modal-value {
    font-size: 3rem;
  }
}