/*사업 분야 소개*/
#business-part-intro {
  margin-top: 11.75rem;
  background: url(../images/business-bg.svg) center top no-repeat;
}
#business-part-intro h1 {
  padding-top: 2.5rem;
}
#business-part-intro .vr {
  display: inline-block;
  width: 1px;
  height: 9.5rem;
  background-color: var(--gray-01);
  /* 애니메이션 준비 */
  transform: scaleY(0);
  transform-origin: top;
  animation: drawLine 1s cubic-bezier(0.4, 0, 0.2, 1) 0.3s forwards;
}
/*라인 애니메이션*/
@keyframes drawLine {
  from {
    transform: scaleY(0);
  }
  to {
    transform: scaleY(1);
  }
}
/*주요 사업*/
/*로컬네비*/
.lnb {
  position: fixed;
  top: 50%;
  right: 6rem;
  transform: translateY(-50%);
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.lnb.is-active {
  opacity: 1;
  pointer-events: auto;
}
.lnb .vr {
  width: 1px;
  height: 1.5rem;
  background-color: var(--primary-dark);
}
.lnb-list {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.lnb-item {
  width: 1rem;
  height: 1rem;
}
.lnb-link {
  transition: all 0.2s;
}
.lnb-link .lnb-img {
  width: 1rem;
  height: 1rem;
  background: url(../images/circle-off.svg) left top no-repeat;
}
.lnb-item.on .lnb-img {
  background: url(../images/circle-w.svg) left top no-repeat;
}
/*컨텐츠*/
#main-business .main-business-con {
  width: 100%;
}
#main-business .business-title,
#main-business .business-txt {
  width: 100%;
  height: calc(100vh - 6.25rem);
  align-content: center;
}
#main-business .business-txt {
  background-color: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
}
#main-business .business-txt.txt-white {
  background-color: rgba(0, 0, 0, 0.4);
}
#main-business .business-txt .body-l {
  width: 90%;
}
#main-business .main-business-con.equipment {
  background: url(../images/business-img-01-1.png) center top no-repeat;
  background-size: cover;
  background-attachment: fixed;
}
#main-business .main-business-con.noise {
  background: url(../images/business-img-02-1.png) left top no-repeat;
  background-size: cover;
  background-attachment: fixed;
}
#main-business .main-business-con.airplane {
  background: url(../images/business-img-03-1.png) center top no-repeat;
  background-size: cover;
  background-attachment: fixed;
}
#main-business .main-business-con.military {
  background: url(../images/business-img-04-1.png) right top no-repeat;
  background-size: cover;
  background-attachment: fixed;
}
#main-business .main-business-con.train {
  background: url(../images/business-img-05-1.png) center top no-repeat;
  background-size: cover;
  background-attachment: fixed;
}
/*기타 사업*/
#oth-business .d-grid {
  grid-template-columns: repeat(2, 1fr);
}
#oth-business .d-grid > div {
  min-height: 29rem;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
#oth-business .wind {
  background: url(../images/business-img-06.png) center no-repeat;
  background-size: cover;
}
#oth-business .house {
  background: url(../images/business-img-07.png) left top no-repeat;
  background-size: cover;
}
#oth-business .indoor {
  background: url(../images/business-img-08.png) left top no-repeat;
  background-size: cover;
}
#oth-business .ground {
  background: url(../images/business-img-09.png) left top no-repeat;
  background-size: cover;
}
/*노트북*/
@media screen and (max-width: 1440px) {
  .lnb-item.on .lnb-tit {
    display: none;
  }
}
/*tablet L*/
@media screen and (max-width: 1024px) {
}
/*tablet M*/
@media screen and (max-width: 768px) {
  #business-part-intro {
    background-size: contain;
  }
  #oth-business .d-grid > div {
    height: 20rem;
  }
  #oth-business .d-grid {
    grid-template-columns: 1fr;
  }
}
/*mobile*/
@media screen and (max-width: 576px) {
  .lnb {
    display: none;
  }
  #main-business .business-txt .body-l {
    width: 100%;
  }
  #oth-business .d-grid > div {
    height: fit-content;
    padding: 2rem 1.5rem;
  }
}