/* 重置默认边距 */
body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    background-color: #f5f5f5;
}

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

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

/* 网格容器 - 固定2x2布局 */
.grid-container {
    display: grid;
    grid-template-columns: 400px 400px;
    grid-template-rows: 400px 400px;
    gap: 30px;
    padding: 40px;
    background-color: #e0e0e0;
    min-height: 100vh;
    width: 100vw;
    box-sizing: border-box;
    margin: 0 auto;
    place-content: center;
}

/* 正方形样式 */
.square {
    width: 400px;
    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);
}

/* 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: background-color 0.3s;
}

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

/* 游戏动态圆点 */
.game-dot {
    position: absolute;
    width: 10px;
    height: 10px;
    background-color: red;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}