/**
 * 数独游戏样式表
 * 莫兰迪配色方案 + 流畅动效
 */

:root {
  /* 莫兰迪配色 */
  --bg-primary: #F5F1E8;
  --bg-board: #FFFFFF;
  --text-primary: #4A5568;
  --text-user: #667EEA;
  --text-initial: #2D3748;
  --border-light: #E2E8F0;
  --border-dark: #4A5568;
  --highlight: #FEF5E7;
  --selected: #EBF4FF;
  --error: #FC8181;
  --success: #48BB78;
  
  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
  background: linear-gradient(135deg, var(--bg-primary) 0%, #E8DFD0 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  color: var(--text-primary);
}

/* 头部 */
.header {
  width: 100%;
  max-width: 600px;
  margin-bottom: 20px;
  text-align: center;
}

.logo {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.tagline {
  font-size: 0.9rem;
  color: #718096;
  font-weight: 300;
}

/* 游戏信息栏 */
.game-info {
  width: 100%;
  max-width: 600px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding: 15px 20px;
  background: var(--bg-board);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.info-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.info-label {
  font-size: 0.75rem;
  color: #A0AEC0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

#timer {
  font-family: 'Courier New', monospace;
  color: var(--text-user);
}

/* 游戏容器 */
.game-container {
  background: var(--bg-board);
  border-radius: 16px;
  padding: 30px;
  box-shadow: var(--shadow-lg);
  margin-bottom: 20px;
}

/* 数独棋盘 */
#sudoku-board {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 0;
  width: 100%;
  max-width: 450px;
  aspect-ratio: 1;
  margin: 0 auto 20px;
  border: 3px solid var(--border-dark);
  border-radius: 8px;
  overflow: hidden;
}

.cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 600;
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: all 0.2s ease;
  background: white;
  user-select: none;
}

/* 宫格粗边框 */
.cell.border-left {
  border-left: 2px solid var(--border-dark);
}

.cell.border-top {
  border-top: 2px solid var(--border-dark);
}

/* 初始数字样式 */
.cell.initial {
  color: var(--text-initial);
  font-weight: 700;
  cursor: not-allowed;
  background: #F7FAFC;
}

/* 玩家填入的数字 */
.cell.user-input {
  color: var(--text-user);
  animation: popIn 0.2s ease;
}

@keyframes popIn {
  0% { transform: scale(0.8); opacity: 0; }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

/* 选中状态 */
.cell.selected {
  background: var(--selected) !important;
  border: 2px solid var(--text-user);
  box-shadow: inset 0 0 0 2px var(--text-user);
}

/* 高亮同行列宫格 */
.cell.highlight {
  background: var(--highlight);
}

/* 错误标记 */
.cell.error {
  background: var(--error);
  color: white;
  animation: shake 0.3s ease;
}

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

/* 控制面板 */
.controls {
  display: flex;
  flex-direction: column;
  gap: 15px;
  max-width: 450px;
  margin: 0 auto;
}

/* 数字按钮 */
.number-buttons {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 8px;
}

.btn-number {
  aspect-ratio: 1;
  font-size: 1.3rem;
  font-weight: 600;
  border: 2px solid var(--border-light);
  background: white;
  color: var(--text-primary);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-number:hover {
  background: var(--text-user);
  color: white;
  border-color: var(--text-user);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

/* 功能按钮 */
.action-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.btn-action {
  padding: 12px;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

#btn-undo {
  background: #E2E8F0;
  color: var(--text-primary);
}

#btn-erase {
  background: #FED7D7;
  color: #C53030;
}

#btn-hint {
  background: #C6F6D5;
  color: #22543D;
}

#btn-check {
  background: #BEE3F8;
  color: #2C5282;
}

.btn-action:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  opacity: 0.9;
}

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

/* 顶部按钮 */
.top-buttons {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}

.btn-top {
  flex: 1;
  padding: 10px 20px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 2px solid var(--text-user);
  background: white;
  color: var(--text-user);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-top:hover {
  background: var(--text-user);
  color: white;
}

/* 弹窗 */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(5px);
}

.modal.show {
  display: flex;
  animation: fadeIn 0.3s ease;
}

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

.modal-content {
  background: var(--bg-board);
  padding: 40px;
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  max-width: 400px;
  width: 90%;
  text-align: center;
  animation: slideUp 0.3s ease;
  position: relative;
}

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

.modal-content h2 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.modal-content p {
  font-size: 1.1rem;
  margin: 15px 0;
  color: #718096;
}

.modal-content strong {
  color: var(--text-user);
  font-size: 1.3rem;
}

.close-modal {
  position: absolute;
  top: 15px;
  right: 15px;
  font-size: 1.5rem;
  color: #A0AEC0;
  cursor: pointer;
  transition: color 0.2s;
}

.close-modal:hover {
  color: var(--text-primary);
}

/* 主菜单 */
#main-menu .modal-content {
  max-width: 500px;
}

.difficulty-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.difficulty-btn {
  padding: 15px 30px;
  font-size: 1.1rem;
  font-weight: 600;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  color: white;
}

.difficulty-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.difficulty-btn[data-difficulty="easy"] {
  background: linear-gradient(135deg, #48BB78, #38A169);
}

.difficulty-btn[data-difficulty="medium"] {
  background: linear-gradient(135deg, #4299E1, #3182CE);
}

.difficulty-btn[data-difficulty="hard"] {
  background: linear-gradient(135deg, #ED8936, #DD6B20);
}

.difficulty-btn[data-difficulty="expert"] {
  background: linear-gradient(135deg, #F56565, #E53E3E);
}

.difficulty-btn[data-difficulty="master"] {
  background: linear-gradient(135deg, #9F7AEA, #805AD5);
}

/* 完成弹窗特殊样式 */
#completion-modal .modal-content {
  background: linear-gradient(135deg, #FFF5F5, #FED7D7);
}

#completion-modal h2 {
  color: var(--success);
  font-size: 2.5rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
  margin: 20px 0;
}

.stat-item {
  background: white;
  padding: 15px;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.stat-label {
  font-size: 0.8rem;
  color: #A0AEC0;
  margin-bottom: 5px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-user);
}

/* 响应式设计 */
@media (max-width: 600px) {
  body {
    padding: 10px;
  }
  
  .game-container {
    padding: 15px;
  }
  
  .logo {
    font-size: 1.5rem;
  }
  
  .cell {
    font-size: 1.2rem;
  }
  
  .btn-number {
    font-size: 1.1rem;
  }
  
  .btn-action {
    font-size: 0.75rem;
    padding: 10px;
  }
  
  .modal-content {
    padding: 30px 20px;
  }
}

@media (max-width: 400px) {
  .cell {
    font-size: 1rem;
  }
  
  .btn-number {
    font-size: 1rem;
  }
  
  .action-buttons {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 加载动画 */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-primary);
}

.spinner {
  border: 4px solid var(--border-light);
  border-top: 4px solid var(--text-user);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 广告位样式 */
.ad-container {
  margin: 20px 0;
  padding: 15px;
  background: #F7FAFC;
  border-radius: 8px;
  text-align: center;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ad-placeholder {
  color: #A0AEC0;
  font-size: 0.9rem;
}

/* 打印隐藏 */
@media print {
  .controls, .game-info, .top-buttons, .ad-container {
    display: none;
  }
}