@charset "UTF-8";
#intro{
  padding: 20px 0 20px;
}

.lower.textbook #main_box{
	margin: 0;
}
 
#intro .img_link{
  width: 100%;
  display: inline-block;
  vertical-align: top;
  border-radius: 10px;
  box-sizing: border-box;
  overflow: hidden;
  -webkit-box-shadow: 3px 3px 6px rgb(0 0 0 / 15%);
  box-shadow: 3px 3px 6px rgb(0 0 0 / 15%);
}

#intro .img_obj{
  font-size: 0;
  display: inline-block;
  vertical-align: top;
  width: 100%;
  padding-top: 16.9643%;
  border-radius: 10px;
  box-sizing: border-box;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: 10% center;
}
#rika_index #intro .img_obj, #rika_textbook #intro .img_obj{
  background-size: cover;
  background-image: url("../../introduction2024/images/introduction2024rika_pc.png");
  background-position: top center;
}
#seikatsu_index #intro .img_obj, #seikatsu_textbook #intro .img_obj{
  background-image: url("../../introduction2024/images/introduction2024seikatsu_pc.png");
  background-color: #fcecd1;
}
#sansu_index #intro .img_obj, #sansu_textbook #intro .img_obj{
  background-image: url("../../introduction2024/images/introduction2024sansu_pc.png");
  background-color: #deedf8;
}
#taiiku_index #intro .img_obj, #taiiku_textbook #intro .img_obj{
  background-image: url("../../introduction2024/images/introduction2024hoken_pc.png");
  background-color: #eae3ef;
}

#science_index #intro .img_obj, #science_textbook #intro .img_obj{
  background-image: url("../../introduction2025/images/introduction2025_science_pc.png");
  background-color: #72d6af;
}
#math_index #intro .img_obj, #math_textbook #intro .img_obj{
  background-image: url("../../introduction2025/images/introduction2025_math_pc.png");
  background-color: #6cc9f4;
}
#pe_index #intro .img_obj, #pe_textbook #intro .img_obj{
  background-image: url("../../introduction2025/images/introduction2025_pe_pc.png");
  background-color: #bbaeef;
}

@media screen and (max-width : 600px){
  #intro, .textbook #intro{
    padding: 1.125rem 0;
  }

  #intro .img_link{
    width: 100%;
    display: inline-block;
    vertical-align: top;
    border-radius: 0.625rem;
    box-sizing: border-box;
    overflow: hidden;
    -webkit-box-shadow: 3px 3px 6px rgb(0 0 0 / 15%);
    box-shadow: 3px 3px 6px rgb(0 0 0 / 15%);
  }

  #intro .img_obj{
    font-size: 0;
    display: inline-block;
    vertical-align: top;
    width: 100%;
    padding-top: 37.464%;
    border-radius: 0.625rem;
    box-sizing: border-box;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: top center;
  }
	#rika_index #intro .img_obj, #rika_textbook #intro .img_obj{
		background-image: url("../../introduction2024/images/introduction2024rika_sp.png");
	}
	#seikatsu_index #intro .img_obj, #seikatsu_textbook #intro .img_obj{
		background-image: url("../../introduction2024/images/introduction2024seikatsu_sp.png");
	}
	#sansu_index #intro .img_obj, #sansu_textbook #intro .img_obj{
		background-image: url("../../introduction2024/images/introduction2024sansu_sp.png");
	}
	#taiiku_index #intro .img_obj, #taiiku_textbook #intro .img_obj{
		background-image: url("../../introduction2024/images/introduction2024hoken_sp.png");
	}
	
	#science_index #intro .img_obj, #science_textbook #intro .img_obj{
		background-image: url("../../introduction2025/images/introduction2025_science_sp.png");
	}
	#math_index #intro .img_obj, #math_textbook #intro .img_obj{
		background-image: url("../../introduction2025/images/introduction2025_math_sp.png");
	}
	#pe_index #intro .img_obj, #pe_textbook #intro .img_obj{
		background-image: url("../../introduction2025/images/introduction2025_math_sp.png");
	}
}