/*** font ***/
@import url('https://fonts.googleapis.com/css2?family=Montserrat&family=Noto+Sans+KR&family=Orbitron:wght@700&display=swap');

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
  font-size: 16px;
}

body {  
  padding-top: 56px;
  font-weight: 400;
  letter-spacing: 0.03em;
  background-color: #ffffff;
  width:100%;
 
}

.logo {
  cursor: pointer;
  padding: 0;
  width: 280px;
}
.logo img {
  width: 220px;
  right:20px;
}

nav.navbar {
  border-bottom: solid 1px #000000;
  background-color: #ffd500;
  z-index: 5; 
}

.navbar .navbar-brand {
  font-weight: 700;
  letter-spacing: .0em;  
}


.navbar-nav .nav-link {
    letter-spacing: .02em;
}

.navbar li.active a {
  font-weight: 600;
}

main.container-fluid {
  padding-left:40;
  padding-right:40;  
}

.spacer {height: 40vh;}

.img-fluid {
  border-radius: 20px 20px 20px 20px;
}

.navbar-toggler {
  background-color: #ffaa00;  
}


.section > .row > .col {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-content: space-around;
  align-items: center;
}

#intro .col {
  height: 50px;
  padding: 10px 10px; 
  margin-top: 20px;
}


/* 제목 텍스트 스타일 */
.elem h1 {
  font-size: 36px; /* 글꼴 크기 */
  font-weight: bold; /* 글꼴 두껍게 설정 */
  color: #333; /* 글자 색상 */
}

/* 부제목 텍스트 스타일 */
.elem h4 {
  font-size: 24px; /* 글꼴 크기 */
  font-weight: normal; /* 글꼴 두껍게 해제 */
  color: #666; /* 글자 색상 */
}

/* 세 번째 텍스트 스타일 */
.elem h5 {
  font-size: 18px; /* 글꼴 크기 */
  font-weight: normal; /* 글꼴 두껍게 해제 */
  color: #999; /* 글자 색상 */
  line-height: 1.5; /* 줄 간격 설정 */
}

#one {
  display: flex;
  border-radius: 20px;
  gap: 8px;
  background-color:#000000;
  padding: 20px;
  justify-content: center;
}

.rectangle h5 {
  font-size: 36px;
  font-weight: 700;
}

.rectangle p {
  font-size: 16px;
  line-height: 1.2rem;
}

.rectangle {
  position: relative;
  margin-top: 60px;
  width: 33.333%; 
  border-radius: 10px;
  background: linear-gradient(45deg, #69b7bf 25%, #ffe664);
  padding: 50px; 
}

#two {
  height: 100%;
  overflow: hidden;
  padding: 40px 0 0 0;
  background: transparent;
}


#two .image {
  display: flex;  
  width: 100%;
  position: relative;
}

#two h5 {
  color: rgb(255, 255, 255);
  line-height: 30px;
  font-weight: 400;
  padding:0 40px 60px 40px ;
  text-align: center;
}

#three, #four {
  position: relative;
  overflow: hidden;
}

#three .image, #four .image {
  position: absolute;
  top: 0;
  bottom:0;
  width: 100%;
  margin-right: 20px;
}

#three .image {
  background-image: url("./os_011/mountain-2.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  background: linear-gradient(180deg, #000000 25%, #868686);  
}

#three h1 {
  color: rgb(0, 217, 255);
  padding-left: 20px;
}

#three h4 {
  color: rgb(255, 204, 0);
  padding-left: 20px;
}

#three h5 {
  color: rgb(162, 162, 162);
  line-height: 1.2rem;
  padding-left: 20px;
  padding-top: 0px;
  z-index: 10;

}

#three img {
  display: flex;
  flex-direction: row;
  margin-left: 20px;
  margin-top: 0px;
  margin-right: 20px;
  width: 100%;
  border-radius: 10px 10px 10px 10px;
  z-index: -1;  
}

#four .image {
  background-image: url("./os_011/mountain-3.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  background: linear-gradient(0deg, #ff2600 25%, #ffb300);
}

#four h1 {
  color: rgb(255, 255, 255);
}

#four h4 {
  color: rgb(98, 255, 0);
}

#four h6 {
  color: rgb(242, 255, 0);
}

body {
  height: 100vh;
   background: linear-gradient(90deg,#e52e71,#ff8a00);
}

.slider-thumb::before {
  position: absolute;
  content: "";
  left: 30%;
  top: 20%;
  width: 800px;
  height: 800px;
  background: #17141d;
  border-radius: 62% 47% 82% 35% / 45% 45% 80% 66%;
  will-change: border-radius, transform, opacity;
  animation: sliderShape 4s linear infinite;
  display: block;
  z-index: -1;
  -webkit-animation: sliderShape 4s linear infinite;
}

@keyframes sliderShape{
  0%,100%{
  border-radius: 42% 58% 70% 30% / 45% 45% 55% 55%;
    transform: translate3d(0,0,0) rotateZ(0.01deg);
  }
  34%{
      border-radius: 70% 30% 46% 54% / 30% 29% 71% 70%;
    transform:  translate3d(0,5px,0) rotateZ(0.01deg);
  }
  50%{
    transform: translate3d(0,0,0) rotateZ(0.01deg);
  }
  67%{
    border-radius: 100% 60% 60% 100% / 100% 100% 60% 60% ;
    transform: translate3d(0,-3px,0) rotateZ(0.01deg);
  }
}

 /* 이 코드는 go_top 버튼을 숨깁니다. 페이지 맨 위로 스크롤할 때만 표시됩니다. */


 .go_top_area {
  position: fixed;
  bottom: 200px; /* 버튼의 위치를 조절할 수 있습니다. */
  right: 10px; /* 버튼의 위치를 조절할 수 있습니다. */
  display: none;
  z-index: 20;
}

.go_top {
  display: block;
  width: 60px;
  height: 60px;
  line-height: 0px;
  text-align: center;
  background-color: #000000;
  color: #c9c9c9; 
  border-color: #c9c9c9;
  border-style: groove;
  text-decoration: none;
}

.go_top:hover { 
  border-radius: 30px 30px 0 0;
  color: #ffe600;
  border-color: #ff0000;
  opacity: 1; /* 마우스 오버 시 이미지를 표시 */
}

.title {
  position: relative;
  text-align: center;
  color: white;
  transform: 50% ;
  padding: 20px;
  margin: 20px;
}

.title h5 {
  font-weight: 200;
  font-size: 36px;
}

.rectangle img {
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

/* Responsive layout - makes a two column-layout instead of four columns */
@media screen and (max-width: 1280px) {
  .img-fluid {
    border-radius: 10px 10px 10px 10px;
  }

  #one {
    display: flex;
    gap: 8px;
    background-color:#000000;
    padding: 10px;
    justify-content: center;
    margin-top: 50px;
    border-radius:10px;
  }
  
  .rectangle h5 {
    font-size: 24px;
    font-weight: 700;
  }
  
  .rectangle p {
    font-size: 14px;
    line-height: 1.0rem;
  }
  
  .rectangle {
    position: relative;
    margin-top: 50px;
    width: 45%; 
    border-radius: 10px;
    background: linear-gradient(45deg, #69b7bf 25%, #ffe664);
    padding: 20px; 
  }

  .title {
    position: relative;
    text-align: center;
    color: white;
    transform: 50% ;
    padding: 20px;
    margin: 20px;
  }
  
  .title h5 {
    font-weight: 200;
    font-size: 30px;
  }

  #three h1 {
    color: rgb(0, 217, 255);
    padding-left: 20px;
    font-size: 80px;
    font-weight: 800;
  }
  
  #three h4 {
    color: rgb(255, 204, 0);
    padding-left: 20px;
    font-size: 28px;
    font-weight: 600;
  }
  
  #three h5 {
    color: rgb(162, 162, 162);
    line-height: 1.2rem;
    padding-left: 20px;
    padding-top: 0px;
    z-index: 10;  
  }

  #four h1 {  
    padding-left: 20px;
}

#four h4 {  
  padding-left: 20px;
}

#four h6 {  
  padding-left: 20px;
  padding-right: 20px;
}


/* Responsive layout - makes a two column-layout instead of four columns */
@media screen and (max-width: 720px) {
  .img-fluid {
    border-radius: 8px;
  }

  .rectangle img {
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  }

  #one {
    display: contents;
    flex-direction: row;
    gap: 8px;
    background-color:transparent;
    padding: 10px;
    justify-content: center;
  }
  
  .rectangle h5 {
    font-size: 24px;
    font-weight: 700;
  }
  
  .rectangle p {
    font-size: 14px;
    line-height: 1.0rem;
  }
  
  .rectangle {    
    position: relative;
    margin-top: 20px;
    width: 100%; 
    border-radius: 10px 10px 300px 300px;
    background: linear-gradient(45deg, #69b7bf 25%, #ffe664);
    padding: 20px; 
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  }
  .title {
    position: relative;
    text-align: center;
    color: white;
    transform: 50% ;
    padding: 20px;
    margin: 20px;
  }
  
  .title h5 {
    font-weight: 200;
    font-size: 28px;
  }
  
  #three h1 {
    color: rgb(0, 217, 255);
    padding-left: 20px;
    font-size: 40px;
    font-weight: 800;
  }
  
  #three h4 {
    color: rgb(255, 204, 0);
    padding-left: 20px;
    font-size: 20px;
    font-weight: 600;
  }
  
  #three h5 {
    color: rgb(162, 162, 162);
    line-height: 1.2rem;
    padding-left: 20px;
    padding-top: 0px;
    z-index: 10;  
  }

  
#two h5 {
  color: rgb(255, 255, 255);
  line-height: 28px;
  font-weight: 300;
  line-height: 24px;
}
  
}

/* Responsive layout - makes a two column-layout instead of four columns */
@media screen and (min-width: 1440px) {
  .img-fluid {
    border-radius: 20px 20px 20px 20px;
  }

  #one {
    display: flex;
    gap: 8px;
    background-color:#000000;
    padding: 10px;
    justify-content: center;
    margin-top: 50px;
    border-radius:10px;
  }
  
  .rectangle h5 {
    font-size: 36px;
    font-weight: 700;
  }
  
  .rectangle p {
    font-size: 14px;
    line-height: 1.0rem;
  }
  
  .rectangle {
    position: relative;
    margin-top: 50px;
    width: 45%; 
    border-radius: 10px;
    background: linear-gradient(45deg, #69b7bf 25%, #ffe664);
    padding: 20px; 
  }

  .title {
    position: relative;
    text-align: center;
    color: white;
    transform: 50% ;
    padding: 20px;
    margin: 20px;
  }
  
  .title h5 {
    font-weight: 400;
    font-size: 40px;
  }

  #two h5 {
    color: rgb(255, 255, 255);
    font-size: 36px;
    line-height: 36px;
    font-weight: 400;
    padding: o 100px 0 100px;
  }

  
#three h1 {
  color: rgb(0, 217, 255);
  padding-left: 20px;
  font-size: 130px;
  font-weight: 800;
}

#three h4 {
  color: rgb(255, 204, 0);
  padding-left: 20px;
  font-size: 30px;
  font-weight: 700;
}

#three h5 {
  color: rgb(162, 162, 162);
  line-height: 1.2rem;
  padding-left: 20px;
  padding-top: 0px;
  z-index: 10;

}

#three img {
  display: flex;
  flex-direction: row;
  margin-left: 20px;
  margin-top: 0px;
  margin-right: 20px;
  width: 100%;
  border-radius: 10px 10px 10px 10px;
  z-index: -1;  
}

.slider-thumb::before {
  position: absolute;
  content: "";
  left: 30%;
  top: 20%;
  width: 1600px;
  height: 1600px;
  background: #17141d;
  border-radius: 62% 47% 82% 35% / 45% 45% 80% 66%;
  will-change: border-radius, transform, opacity;
  animation: sliderShape 4s linear infinite;
  display: block;
  z-index: -1;
  -webkit-animation: sliderShape 4s linear infinite;
}

#four h1 {
  color: rgb(255, 255, 255);
  font-size: 120px;
}

#four h4 {
  color: rgb(98, 255, 0);
  font-size: 36px;
  font-weight: 600;
}

#four h6 {
  color: rgb(242, 255, 0);
  font-size: 24px;
  font-weight: 300
  ;
}  

}



}