/* ==================== CSS变量 ==================== */
:root {
  --primary-color: #8b5cf6;
  --primary-dark: #7c3aed;
  --secondary-color: #ec4899;
  --accent-color: #f59e0b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --info-color: #06b6d4;
  
  --bg-gradient-start: #8b5cf6;
  --bg-gradient-end: #ec4899;
  
  --card-bg: #ffffff;
  --card-shadow: rgba(0, 0, 0, 0.1);
  --card-shadow-hover: rgba(0, 0, 0, 0.2);
  
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --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: 1000px;
  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: rotate 3s infinite;
  display: inline-block;
}

@keyframes rotate {
  0%, 100% {
    transform: rotate(0deg);
  }
  50% {
    transform: rotate(10deg);
  }
}

.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 ==================== */
/* Author: SinceraXY */
.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 15px;
  margin: 30px 0;
}

.stat-card {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  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, #f0fdf4, #dcfce7);
  border-radius: var(--border-radius);
}

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

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

.difficulty-btn {
  padding: 10px 20px;
  border: 2px solid #e5e7eb;
  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: #f5f3ff;
  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(139, 92, 246, 0.4);
}

/* ==================== 游戏区域 ==================== */
.game-area {
  margin: 30px 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* 预览区域 */
.preview-section {
  text-align: center;
}

.preview-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  margin-bottom: 15px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.preview-toggle {
  padding: 6px 16px;
  border: 2px solid var(--primary-color);
  background: white;
  border-radius: var(--border-radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  color: var(--primary-color);
}

.preview-toggle:hover {
  background: var(--primary-color);
  color: white;
}

.preview-container {
  display: inline-block;
  padding: 15px;
  background: linear-gradient(135deg, #f9fafb, #f3f4f6);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 15px var(--card-shadow);
  transition: var(--transition);
}

.preview-container.hidden {
  opacity: 0.3;
  filter: blur(10px);
}

#preview-canvas {
  display: block;
  border-radius: var(--border-radius-sm);
  max-width: 100%;
  height: auto;
}

/* 拼图板 */
.puzzle-board {
  display: grid;
  gap: 2px;
  padding: 15px;
  background: linear-gradient(135deg, #f9fafb, #f3f4f6);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 15px var(--card-shadow);
  margin: 0 auto;
  max-width: fit-content;
}

.puzzle-piece {
  cursor: pointer;
  transition: var(--transition);
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  position: relative;
  overflow: hidden;
}

.puzzle-piece:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  z-index: 10;
}

.puzzle-piece.selected {
  border: 3px solid var(--accent-color);
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.6);
  transform: scale(1.08);
}

.puzzle-piece.correct {
  border: 2px solid var(--success-color);
  animation: correctPulse 0.5s;
}

.puzzle-piece.wrong {
  border: 2px solid var(--warning-color);
  animation: wrongShake 0.5s;
}

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

@keyframes wrongShake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  75% {
    transform: translateX(5px);
  }
}

/* ==================== 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;
  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: 140px;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-info {
  background: linear-gradient(135deg, var(--info-color), #0891b2);
}

.btn-info:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
}

.btn-warning {
  background: linear-gradient(135deg, var(--warning-color), #d97706);
}

.btn-warning:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
}

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

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

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

.hide {
  display: none !important;
}

/* ==================== 游戏说明 ==================== */
.game-instructions {
  margin-top: 30px;
  padding: 20px;
  background: linear-gradient(135deg, #ede9fe, #ddd6fe);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--primary-color);

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

}

.game-instructions h3 {
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.game-instructions ul {
  list-style: none;
  padding: 0;
}

.game-instructions li {
  padding: 8px 0;
  color: var(--text-secondary);
  position: relative;
  padding-left: 25px;
}

.game-instructions li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
}

.game-instructions strong {
  color: var(--primary-color);
}

/* ==================== 完成弹窗 ==================== */
.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;
}

@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-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
  margin: 30px 0;
}

.modal-stat {
  padding: 20px 15px;
  background: linear-gradient(135deg, #f0f9ff, #e0e7ff);
  border-radius: var(--border-radius);
}

.modal-stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
  white-space: nowrap;
}

.modal-stat-value {
  font-size: 1.8rem;
  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;
  word-break: keep-all;
  white-space: nowrap;
}

.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 {
/* Dedicated to my girlfriend */
    font-size: 2rem;
  }
  
  .header-icon {
    font-size: 3rem;
  }
  
  .stats-container {
    grid-template-columns: 1fr;
  }
  
  .difficulty-container {
    flex-direction: column;
    gap: 10px;
  }
  
  .difficulty-buttons {
    flex-direction: column;
    width: 100%;
  }
  
  .difficulty-btn {
    width: 100%;
  }
  
  .controls {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .modal-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 20px 15px;
  }
  
  .game-title {
    font-size: 1.6rem;
  }
  
  .stat-value {
    font-size: 1.5rem;
  }
  
  .modal-stat-value {
    font-size: 1.5rem;
  }
}