:root {
    --bg-color: #f5f5f5;
    --text-color: #333;
    --game-bg: #fff;
    --cell-bg: #f8fafc;
    --snake-color: #6366f1;
    --food-color: #10b981;
    --border-color: #e2e8f0;
    --control-bg: #fff;
    --score-color: #64748b;
    --mask-color: #ffffff30;
  }

  .dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #e5e7eb;
    --game-bg: #2d2d2d;
    --cell-bg: #333;
    --snake-color: #818cf8;
    --food-color: #34d399;
    --border-color: #374151;
    --control-bg: #2d2d2d;
    --score-color: #9ca3af;
    --mask-color: #00000030;
  }

  html {
      user-select: none;
  }

  body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: 0.5s;
  }

  /* 标题 */
  .title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.05em;
  }

  /* 游戏容器 */
  .game-container {
    position: relative;
    background: var(--game-bg);
    border-radius: 16px;
    box-shadow: 0 12px 32px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: 0.3s;
  }

  /* 游戏板 */
  .game-board {
    display: grid;
    grid-template-rows: repeat(20, 20px);
    grid-template-columns: repeat(20, 20px);
    gap: 1px;
    background: var(--cell-bg);
    padding: 12px;
    transition: 0.3s;
  }

  /* 单元格 */
  .cell {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    transition: transform 2s ease;
  }

  .cell.snake {
    background: #6366f1;
    box-shadow: 0 2px 4px rgba(99,102,241,0.2);
  }

  .cell.food {
    background: #10b981;
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.5); }
    100% { transform: scale(1); }
  }

  @keyframes snakeFadeIn {
      0% { opacity: 0; transform: scale(0.5); }
      100% { opacity: 1; transform: scale(1); }
  }

  @keyframes starPulse {
      0% { transform: scale(1);}
      50% { transform: scale(1.1); rotate: 360deg; }
      100% { transform: scale(1); }
  }

  .theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: #00000000;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-color);
    transition: all 0.2s ease;
  }

  .theme-toggle:hover {
    scale: 1.1;
  }

/* 修改控制栏样式 */
.control-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: var(--control-bg);
    border-top: 1px solid var(--border-color);
    transition: 0.2s;
    gap: 0.5rem; /* 减少按钮间距 */
  }
  
  /* 调整按钮顺序 */
  .control-bar .start-btn {
    order: 2; /* 开始按钮在中间 */
  }
  
  .control-bar .pause-btn {
    order: 1; /* 暂停按钮在左侧 */
  }
  
  .control-bar .theme-toggle {
    order: 3; /* 主题切换按钮在右侧 */
  }

  /* 得分显示 */
  .score {
    font-size: 1.25rem;
    font-weight: light;
    color: #64748b;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: 0.2s;
  }

  .score i {
      color: #f6e05e;
      animation: starPulse 9s cubic-bezier(0.075, 0.82, 0.165, 1) infinite;
  }

  #score {
    font-weight: 600;
    color: var(--text-color);
    transition: 0.2s;
  }

  /* 按钮 */
  .start-btn {
    padding: 0.75rem 1.5rem;
    background: #4f46e5;
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .start-btn:hover {
    background: #6366f1;
    transform: translateY(-1px);
    border: none;
  }

  .start-btn:active {
    transform: scale(0.9);
    background: #4f46e5
  }

  .start-btn::before {
    content: "▶";
    font-size: 0.9em;
  }

  /* 新增暂停按钮样式 */
.pause-btn {
    padding: 0.75rem 1.5rem;
    background: #f59e0b;
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
  }
  
  .pause-btn:hover {
    background: #fbbf24;
    transform: translateY(-1px);
  }
  
  .pause-btn:active {
    transform: scale(0.9);
  }

  .pause-btn span {
    font-size: 0.75rem;
    margin-left: 4px;
    background-color: #00000030;
    padding: 0px 4px;
    border-radius: 4px;
  }

  /* 状态提示 */
  .status {
    position: absolute;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    font-weight: bolder;
    color: #858585;
    background-color: var(--mask-color);
    backdrop-filter: blur(10px);
    width: 100%;
    height: 470px;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .status.paused {
    transition: 0.3s;
    font-size: 2rem;
  }

  .status.visible {
    opacity: 1;
  }