.sec-title{
	font-weight:bold; 
	text-align:center;
	position:relative;
	padding:1.5rem 0;
	font-size:2.5rem;
}
.sec-title:after{
	content: '';
    width: 3rem;
    height: 2px;
    border-bottom:2px solid var(--bs-theme-color);
    position: absolute;
    bottom: 0;
    left: 50%; 
    transform: translate(-50%, 0);
}

.ab-video{
	text-align:center;
}
.ab-video iframe{
	width:1320px;
	max-width:100%;
	height:743px;
}

.ab-intro-title h1{
	font-weight:bold;
	font-size:2.5rem;
}
.ab-tech-content2,
.ab-tech-content,
.ab-intro-content{
	font-size:0.9rem;
	line-height:1.8;
	color:#666;
}


.ab-shicha{
	height: 400px;
    background: no-repeat center;
    background-size: cover;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    position:relative;
}
.ab-shicha:after{
	content:'';
	position:absolute;
	top:0;
	left:0;
	height: 100%;
    width: 100%;
    background-color: #000;
    opacity: 0.3;
}
.ab-shicha h2{
	width:40rem;
	max-width:80%;
	position:relative;
	z-index:100;
	text-align:center;
	font-weight:bold; 
	font-size:2rem;
	line-height:1.2;
}
.ab-tech-swiper .swiper-slide{
	border-radius:8px;
	overflow:hidden;
}
.ab-certification-swiper .swiper-slide img,
.ab-tech-swiper .swiper-slide img{
	max-width:100%;
} 
.ab-certification-swiper .swiper-slide{
	border:1px solid #ccc;
}


@media only screen and (max-width: 1040px){
	.ab-video iframe{
		height:calc( (100vw - var(--bs-gutter-x))*576/1024 );
	}
	.sec-title{
		font-size:1.5rem;
		padding:1rem 0;
	}
	.ab-shicha h2,
	.ab-intro-title h1{
		font-size:1.5rem;
	}
	.ab-shicha{
		background-size:auto 140%;
		height:200px;
		background-attachment: inherit;
		background-position:center 20%;
	}
}