style.css

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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #333;
}

.game-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 500px;
    width: 100%;
}

h1 {
    color: #4a5568;
    margin-bottom: 20px;
    font-size: 2.5em;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.game-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.score-display {
    display: flex;
    gap: 20px;
    font-weight: bold;
    font-size: 1.1em;
}

.score-display span {
    color: #2d3748;
}

#score, #highScore {
    color: #e53e3e;
}

.level-display {
    display: flex;
    gap: 20px;
    font-weight: bold;
    font-size: 1.1em;
    margin-top: 10px;
}

.level-display span {
    color: #2d3748;
}

#food-info {
    font-weight: bold;
    font-size: 1.1em;
    margin-top: 10px;
    color: #2d3748;
}

#level {
    color: #3182ce;
}

#foodCount {
    color: #38a169;
}

.game-status {
    font-weight: bold;
    color: #2b6cb0;
    font-size: 1.1em;
}

#gameCanvas {
    border: 3px solid #4a5568;
    border-radius: 10px;
    background-color: #1a202c;
    margin: 20px 0;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.btn {
    background: linear-gradient(135deg, #4299e1, #3182ce);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1em;
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(66, 153, 225, 0.3);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(66, 153, 225, 0.4);
    background: linear-gradient(135deg, #3182ce, #2c5282);
}

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

.btn:disabled {
    background: #a0aec0;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.instructions {
    margin-top: 30px;
    text-align: left;
    background: rgba(237, 242, 247, 0.8);
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid #4299e1;
}

.instructions h3 {
    color: #2d3748;
    margin-bottom: 15px;
    text-align: center;
}

.instructions p {
    margin-bottom: 8px;
    color: #4a5568;
    line-height: 1.5;
}

/* 响应式设计 */
@media (max-width: 600px) {
    .game-container {
        padding: 20px;
        margin: 10px;
    }
    
    h1 {
        font-size: 2em;
    }
    
    #gameCanvas {
        width: 100%;
        max-width: 350px;
        height: auto;
    }
    
    .game-info {
        flex-direction: column;
        gap: 10px;
    }
    
    .score-display {
        justify-content: center;
    }
    
    .controls {
        gap: 10px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9em;
    }
 }
 
 /* 弹窗样式 */
 .modal {
     display: none;
     position: fixed;
     z-index: 1000;
     left: 0;
     top: 0;
     width: 100%;
     height: 100%;
     background-color: rgba(0, 0, 0, 0.7);
     backdrop-filter: blur(5px);
     animation: modalFadeIn 0.3s ease-out;
 }
 
 .modal-content {
     background: linear-gradient(135deg, #ffffff 0%, #f7fafc 100%);
     margin: 10% auto;
     padding: 0;
     border-radius: 20px;
     width: 90%;
     max-width: 450px;
     box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
     animation: modalSlideIn 0.4s ease-out;
     overflow: hidden;
 }
 
 .modal-header {
     background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
     color: white;
     padding: 25px;
     text-align: center;
     border-radius: 20px 20px 0 0;
 }
 
 .modal-header h2 {
     margin: 0;
     font-size: 1.8em;
     text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
 }
 
 .modal-body {
     padding: 30px 25px;
     text-align: center;
 }
 
 .modal-body p {
     margin: 15px 0;
     line-height: 1.6;
 }
 
 #levelCompleteText {
     font-size: 1.3em;
     font-weight: bold;
     color: #2d3748;
     margin-bottom: 20px;
 }
 
 .level-info {
     color: #4a5568;
     font-size: 1.1em;
 }
 
 .snake-reset-info {
     color: #718096;
     font-size: 0.95em;
     font-style: italic;
     background: rgba(237, 242, 247, 0.8);
     padding: 10px;
     border-radius: 8px;
     border-left: 4px solid #4299e1;
 }
 
 .modal-footer {
     padding: 20px 25px 30px;
     display: flex;
     justify-content: center;
     gap: 15px;
     flex-wrap: wrap;
 }
 
 .btn-primary {
     background: linear-gradient(135deg, #48bb78, #38a169);
     color: white;
     border: none;
     padding: 12px 30px;
     border-radius: 25px;
     cursor: pointer;
     font-size: 1.1em;
     font-weight: bold;
     transition: all 0.3s ease;
     box-shadow: 0 4px 15px rgba(72, 187, 120, 0.3);
 }
 
 .btn-primary:hover {
     transform: translateY(-2px);
     box-shadow: 0 6px 20px rgba(72, 187, 120, 0.4);
     background: linear-gradient(135deg, #38a169, #2f855a);
 }
 
 .btn-secondary {
     background: linear-gradient(135deg, #a0aec0, #718096);
     color: white;
     border: none;
     padding: 12px 30px;
     border-radius: 25px;
     cursor: pointer;
     font-size: 1.1em;
     font-weight: bold;
     transition: all 0.3s ease;
     box-shadow: 0 4px 15px rgba(160, 174, 192, 0.3);
 }
 
 .btn-secondary:hover {
     transform: translateY(-2px);
     box-shadow: 0 6px 20px rgba(160, 174, 192, 0.4);
     background: linear-gradient(135deg, #718096, #4a5568);
 }
 
 /* 弹窗动画 */
 @keyframes modalFadeIn {
     from {
         opacity: 0;
     }
     to {
         opacity: 1;
     }
 }
 
 @keyframes modalSlideIn {
     from {
         transform: translateY(-50px) scale(0.9);
         opacity: 0;
     }
     to {
         transform: translateY(0) scale(1);
         opacity: 1;
     }
 }
 
 /* 响应式弹窗 */
  @media (max-width: 600px) {
      .modal-content {
          margin: 5% auto;
          width: 95%;
      }
      
      .modal-header {
          padding: 20px;
      }
      
      .modal-header h2 {
          font-size: 1.5em;
      }
      
      .modal-body {
          padding: 25px 20px;
      }
      
      #levelCompleteText {
          font-size: 1.2em;
      }
      
      .modal-footer {
          padding: 15px 20px 25px;
          flex-direction: column;
      }
      
      .btn-primary,
      .btn-secondary {
          width: 100%;
          margin: 5px 0;
      }
  }
  


/* 游戏状态动画 */
.game-status {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

/* 分数增加动画 */
.score-animation {
    animation: scoreUp 0.5s ease-out;
}

@keyframes scoreUp {
    0% {
        transform: scale(1);
        color: #e53e3e;
    }
    50% {
        transform: scale(1.2);
        color: #38a169;
    }
    100% {
        transform: scale(1);
        color: #e53e3e;
    }
}

/* 关卡升级动画 */
.level-up-animation {
    animation: levelUp 1s ease-out;
}

@keyframes levelUp {
    0% {
        transform: scale(1);
        color: #3182ce;
    }
    25% {
        transform: scale(1.3);
        color: #f6ad55;
    }
    50% {
        transform: scale(1.1);
        color: #68d391;
    }
    75% {
        transform: scale(1.2);
        color: #f093fb;
    }
    100% {
        transform: scale(1);
        color: #3182ce;
    }
}

/* 食物计数动画 */
.food-count-animation {
    animation: foodCount 0.3s ease-out;
}

@keyframes foodCount {
    0% {
        transform: scale(1);
        color: #38a169;
    }
    50% {
        transform: scale(1.15);
        color: #f6ad55;
    }
    100% {
        transform: scale(1);
        color: #38a169;
    }
}

/* 关卡通过提示样式 */
.level-complete-message {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 50%, #4facfe 100%);
    color: white;
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: bold;
    animation: levelCompleteGlow 2s ease-in-out;
    box-shadow: 0 0 20px rgba(240, 147, 251, 0.6);
}

@keyframes levelCompleteGlow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(240, 147, 251, 0.6);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 0 30px rgba(240, 147, 251, 0.8);
        transform: scale(1.05);
    }
}