@font-face {
    font-family: 'TheJamsil5Bold';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/noonfonts_2302_01@1.0/TheJamsil5Bold.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
}

section {
    font-family: 'TheJamsil5Bold';
}

.first_background {
    height: 100vh;
}

.bg_control {
    transition: 4s;
}


/* 사이드 바 */
#sidenav {
    opacity: 0;
    color: white;
    text-align: center;
    background-color: rgba(0, 0, 0, 0.5);
    line-height: 10%;
}


/* 바로가기 카테고리 */
#menu_text {
    text-align: center;
}

.card-body {
    text-align: center;
}

.card-title a {
    text-decoration: none;
    color: rgba(0, 0, 0, 0.6);
}

.card-title a:hover {
    color: rgba(0, 0, 0);
}


/* 첫 텍스트 */
#first_text {
    height: 100vh;
    font-size: 7rem;
    opacity: 0;
    transition: 1.5s;
    color: white;
}

.title {
    color: black;
}


/* 섹션별 사진 */
.img_section {
    height: 50vh;
}

.img_section img {
    width: 80%;
    opacity: 0;
    transition: all 3s;
}

.img_section p {
    font-size: 4rem;
}

.img_text {
    opacity: 0;
    transition: all 5s;
    color: black;
    font-size: 2rem;
}

/* 설명 텍스트 */
.descript_text {
    color: rgba(0, 0, 0, 0.6);
    font-size: 1.5rem;
    text-align: right;
}

.first_background .descript_text {
    text-align: end;
}

#formula {
    font-size: 1.2rem;
}