/* 🔹 서브 네비게이션 스타일 */
.sub-nav {
    display: flex;
    justify-content: center;
    padding: 1rem 0;
    border-bottom: 2px solid #dcdcdc;
}

.sub-nav-link {
    background: none;
    border: none;
    font-size: 1.2rem;
    font-weight: bold;
    padding: 0.8rem 2rem;
    cursor: pointer;
    transition: color 0.3s ease;
    color: #333;
}

.sub-nav-link.active {
    color: #1A4B8C;
    border-bottom: 3px solid #1A4B8C;
}

/* 🔹 배경 이미지 스타일 */
.about-header {
    position: relative;
    width: 100%;
    height: 250px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.about-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('/about/images/about_bg.jpg') center/cover no-repeat;
    filter: brightness(50%);
    transition: background 0.5s ease-in-out;
}

.about-title {
    position: relative;
    font-size: 3rem;
    color: white;
    font-weight: bold;
    margin-top: 5rem;
}

/* 🔹 컨텐츠 영역 */
.about-content {
    text-align: center;
    margin: 8rem 0 8rem 2rem;
    max-width: 1900px; /* 기존 1000px → 1900px으로 확장 */
    width: 95%; /* 화면 크기에 따라 유동적으로 확장 */
}

/* 🔹 회사 소개 컨텐츠 */
.about-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    text-align: left;
}

.about-text {
    flex: 1;
    font-size: 1.1rem;
    line-height: 1.3;
}

.about-text p {
    margin-bottom: 0.8rem;
}

.about-image {
    flex: 1;
    text-align: center;
}

.about-image img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
}

/* 🔹 연혁 및 조직도 이미지 */
.content-section img {
    max-width: 90%;
    height: auto;
}

/* 🔹 숨김/활성화 */
.content-section {
    display: none;
}

.content-section.active {
    display: block;
}


.timeline-wrapper {
    position: relative;
    width: 100%;
    margin: 40px auto; /* 상하 여백 추가 */
    margin-left: 60px; /* 전체를 오른쪽으로 이동 */
    height: 350px;
}

.timeline-wrapper .middle-line {
    position: absolute;
    width: 97%;
    height: 5px;
    top: 50%;
    transform: translateY(-50%);
    background: linear-gradient(to right, #66CCFF, #1A4BBC);
}

.box {
    width: 10%; /* 간격 유지 */
    position: relative;
    min-height: 350px;
    float: right;
    overflow: visible !important;
}

.box .date {
    position: absolute;
    top: 50%;
    left: 0px;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    border-radius: 100%;
    background-color: #FFFFFF;
    border: 2px solid transparent;
    background-image: linear-gradient(white, white), linear-gradient(90deg, #66CCFF, #3388CC);
    background-origin: border-box;
    background-clip: content-box, border-box;
}

.date p {
    text-align: center;
    margin-top: 13px;
    margin-bottom: 0px;
    color: #1A4B8C;
    font-weight: bold;
}

.box .box-content {
    border-radius: 5px;
    background-color: #1A4BBC;
    width: 200px;
    min-height: 120px;
    max-height: 150px;
    overflow-y: auto;
    position: absolute;
    left: -72px;
    padding: 15px;

    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center; /* 세로 중앙 정렬 */
    text-align: left;
}

.box-content p {
    margin: 0;
    color: white;
}

.box-content p strong {
    color: #66CCFF;  /* "월" 부분 강조 색상 (골드) */
    font-weight: bold;
}


.box-bottom .box-content {
    top: 70%;
}

.box-top .box-content {
    bottom: 70%;
}

.box-content::before {
    content: " ";
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    border: 10px solid transparent;
}

/* 🔹 스크롤 박스만 따로 정렬 조정 */
.box .scroll-box {
    justify-content: flex-start;  /* 내용이 위쪽부터 표시됨 */
    align-items: flex-start;  /* 좌측 정렬 */
    padding-top: 10px; /* 내부 여백 추가 */
}

/* 🔹 스크롤 스타일 */
.scroll-box::-webkit-scrollbar {
    width: 5px;
}

.scroll-box::-webkit-scrollbar-thumb {
    background-color: #004080; /* 어두운 파란색 스크롤바 */
    border-radius: 5px;
}

.scroll-box::-webkit-scrollbar-track {
    background-color: #f1f1f1;
}

/* 🔹 하단 박스의 화살표 (상단에 표시) */
.box-bottom::after {
    content: "";
    position: absolute;
    top: 235px; /* 박스 위쪽 */
    left: 14%;
    transform: translateX(-50%);
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 10px solid #1A4BBC; /* 화살표 색상 */
}

/* 🔹 상단 박스의 화살표 (하단에 표시) */
.box-top::after {
    content: "";
    position: absolute;
    bottom: 235px; /* 박스 아래쪽 */
    left: 14%;
    transform: translateX(-50%);
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 10px solid #1A4BBC; /* 화살표 색상 */
}





#loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
}

#loading img {
    width: 80px;
    height: 80px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

@media (max-width: 768px) {
    .grid-container {
        grid-template-columns: 1fr;
    }
}