/* 重置默认边距 */
body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    background-color: #f5f5f5;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* 应用容器填满整个视口并居中 */
.app-container {
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
}

/* 重置body样式 */
body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

/* 网格容器 - 响应式布局 */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 400px));
    grid-template-rows: repeat(auto-fit, minmax(300px, 400px));
    gap: 20px;
    padding: 20px;
    background-color: #e0e0e0;
    min-height: 100vh;
    width: 100vw;
    box-sizing: border-box;
    margin: 0 auto;
    place-content: center;
    transition: all 0.3s ease;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .grid-container {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(2, 1fr);
        gap: 15px;
        padding: 15px;
    }
}

@media (max-width: 768px) {
    .grid-container {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(4, 1fr);
        gap: 10px;
        padding: 10px;
    }
}

/* 正方形样式 */
.square {
    width: 100%;
    height: 100%;
    min-width: 300px;
    min-height: 300px;
    max-width: 400px;
    max-height: 400px;
    background-color: #ffffff;
    background-image: 
        linear-gradient(to right, #ddd 1px, transparent 1px),
        linear-gradient(to bottom, #ddd 1px, transparent 1px);
    background-size: 20px 20px;
    border: 5px solid #555;
    border-radius: 15px;
    position: relative;
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
    transition: all 0.3s ease;
    overflow: hidden;
}

.square:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

/* 连接状态圆点 */
.connection-dot {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: #ff4444; /* 默认断开状态-红色 */
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    z-index: 10;
}

.connection-dot.connected {
    background-color: #44ff44; /* 连接状态-绿色 */
    animation: pulse 2s infinite;
}

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

/* 加载指示器 */
.loading-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 5;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 游戏动态圆点 */
.game-dot {
    position: absolute;
    width: 12px;
    height: 12px;
    background: linear-gradient(45deg, #ff6b6b, #ff8e8e);
    border-radius: 50%;
    pointer-events: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
    animation: dotAppear 0.3s ease-out;
    z-index: 5;
    /* 平滑移动效果 */
    transition: left 0.08s linear, top 0.08s linear;
    will-change: left, top, transform;
    /* 启用GPU加速 */
    transform: translate3d(-50%, -50%, 0);
    backface-visibility: hidden;
}

/* 标记为玩家控制的点 */
.game-dot.player-controlled {
    background: linear-gradient(45deg, #4a90e2, #63b3ed);
    box-shadow: 0 0 10px rgba(74, 144, 226, 0.6);
    width: 14px;
    height: 14px;
    /* 为玩家控制的点设置更快的响应速度 */
    transition: left 0.06s linear, top 0.06s linear;
}

@keyframes dotAppear {
    0% {
        transform: translate3d(-50%, -50%, 0) scale(0);
        opacity: 0;
    }
    50% {
        transform: translate3d(-50%, -50%, 0) scale(1.2);
        opacity: 0.8;
    }
    100% {
        transform: translate3d(-50%, -50%, 0) scale(1);
        opacity: 1;
    }
}

/* 状态栏 */
.status-bar {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 10px 20px;
    border-radius: 25px;
    display: flex;
    gap: 20px;
    font-size: 14px;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    z-index: 100;
    transition: all 0.3s ease;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.status-item::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #44ff44;
}

/* 键盘快捷键提示 */
.keyboard-hints {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 15px;
    border-radius: 10px;
    font-size: 12px;
    backdrop-filter: blur(10px);
    z-index: 100;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.keyboard-hints:hover {
    opacity: 1;
}

.keyboard-hints h4 {
    margin: 0 0 10px 0;
    font-size: 14px;
}

.keyboard-hints ul {
    margin: 0;
    padding-left: 20px;
}

.keyboard-hints li {
    margin: 5px 0;
}

/* 错误状态样式 */
.square.error {
    border-color: #ff4444;
    animation: errorShake 0.5s ease-in-out;
}

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

/* 性能优化 */
.square {
    will-change: transform;
}

.game-dot {
    will-change: transform, opacity;
}

/* 无障碍支持 */
@media (prefers-reduced-motion: reduce) {
    .spinner,
    .game-dot,
    .connection-dot.connected {
        animation: none;
    }
    
    .square:hover {
        transform: none;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .square {
        border-width: 3px;
        border-color: #000;
    }
    
    .game-dot {
        background: #000;
        box-shadow: 0 0 0 2px #fff;
    }
}