body {
    margin: 0;
    font-family: 'Noto Sans KR', sans-serif;
    background-color: #f5f7fa;
    color: #222;
    line-height: 1.6;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.inner {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.site-header {
    background-color: #001e3c;
    color: #fff;
    position: fixed;
    padding-bottom: 3rem;
    top: 0;
    left: 0;
    right: 0;
    z-index: -1;
    padding: 1rem 0;
    box-shadow: 0 0.1rem 0.5rem rgba(0, 0, 0, 0.1);
}

.site-header .inner {
    max-width: none;
    width: 90%;
    padding-left: 2rem;
    padding-right: 2rem;
    padding-bottom: 0.5rem;
    padding-top: 0.5rem;
}

.logo {
    font-size: 1.75rem;
    font-weight: bold;
}

nav .nav-list {
    display: flex;
    gap: 2rem;
    list-style: none;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
}

nav a {
    color: #fff;
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.2s;
}

nav a:hover {
    color: #66ccff;
}

.hero {
    background: url('../images/earth.jpg') center/cover no-repeat;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.hero .overlay {
    background-color: rgba(0, 0, 0, 0.45);
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-text {
    color: #fff;
    text-align: center;
    padding: 2rem;
    border-radius: 1rem;
    max-width: 90%;
}

.hero-text h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
}

.hero-text p {
    font-size: 1.25rem;
    margin: 0;
}

.section-box {
    padding: 6vh 0;
}

.alt-bg {
    background-color: #ffffff;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.content-grid.reverse {
    direction: rtl;
}

.content-grid.reverse > * {
    direction: ltr;
}

.text-block h2 {
    font-size: 2rem;
    color: #003366;
    margin-bottom: 1rem;
    border-left: 0.3rem solid #003366;
    padding-left: 0.75rem;
}

.text-block p,
.text-block ul {
    font-size: 1rem;
}

.text-block ul {
    list-style: disc;
    padding-left: 1rem;
}

.clients-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    align-items: center;
    margin-top: 2rem;
}

.clients-grid img {
    height: 3.5rem;
    filter: grayscale(1);
    opacity: 0.8;
    transition: all 0.3s;
}

.clients-grid img:hover {
    filter: none;
    opacity: 1;
}

footer {
    background-color: #001e3c;
    color: #fff;
    text-align: center;
    padding: 2rem 0;
    font-size: 0.9rem;
}

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

    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-text p {
        font-size: 1rem;
    }

    nav .nav-list {
        flex-direction: column;
        gap: 1rem;
    }

    .logo {
        font-size: 1.25rem;
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s ease-out, transform 1s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.organization-image {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem 0;
}

.organization-image img {
    max-width: 100%;
    height: auto;
}

.nav-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    display: none;
    background-color: #fff;
    border: 1px solid #ccc;
    padding: 0.5rem 0;
    min-width: 180px;
    z-index: 10;
}

.dropdown-menu li {
    position: relative;
}

.dropdown-menu li ul.dropdown-submenu {
    position: absolute;
    top: 0;
    left: 100%;
    display: none;
    background-color: #001e3c;
    border: 1px solid #ccc;
    padding: 0.5rem 0;
    min-width: 180px;
    z-index: 10;
    border-radius: 1rem;
}

.dropdown-menu li.nav-dropdown:hover > ul {
    display: block;
}

.nav-dropdown:hover .dropdown-menu {
    display: block;
}

.hero-sub {
    background-color: #001e3c;
    color: #fff;
    padding: 4rem 0;
    text-align: center;
}

.hero-sub .overlay h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.hero-sub .overlay p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.company_mark {
    width: 9%;
}

@media (max-width: 768px) {
    nav .nav-list {
        display: flex !important;
        flex-direction: row !important;
        flex-wrap: nowrap !important;
        overflow-x: auto !important;
        overflow-y: auto;
        white-space: nowrap !important;
        align-items: center;
        padding-bottom: 0.5rem;
        list-style: none;
        gap: 1rem;
    }

    nav .nav-list > li {
        flex: 0 0 auto !important;
        display: inline-flex;
        align-items: center;
    }

    .nav-dropdown {
        position: relative !important;
        z-index: 1000 !important;
    }

    .dropdown-menu,
    .dropdown-submenu {
        display: none;
        position: absolute !important;
        top: 100%;
        left: 0;
        background-color: #001e3c;
        z-index: 99999 !important;
        min-width: 180px;
        border-radius: 0.5rem;
        padding: 0.5rem 0;
    }

    .nav-dropdown.open > .dropdown-menu {
        display: block !important;
    }

    .company_mark {
    width: 21%;
    }
}




@media (max-width: 768px) {
    .hero {
        height: calc(100vh - 80px); /* 모바일에서만 조정 */
    }
}

@media (max-width: 768px) {
    .dropdown-menu {
        display: none;
        position: static;
        background-color: #001e3c;
        padding-left: 1rem;
    }

    .nav-dropdown.open > .dropdown-menu {
        display: block;
    }

    .dropdown-menu li ul.dropdown-submenu {
        position: static;
        display: none;
        background-color: #003366;
        padding-left: 1rem;
    }

    .dropdown-menu li.nav-dropdown.open > ul.dropdown-submenu {
        display: block;
    }
}

/* 모바일: .open 클래스 기반 */
@media (max-width: 768px) {
    .dropdown-menu,
    .dropdown-submenu {
        position: absolute;
    }

    .nav-dropdown.open > .dropdown-menu,
    .dropdown-menu .nav-dropdown.open > .dropdown-submenu {
        display: block;
    }

    .site-header,
    .nav-list,
    .dropdown-menu,
    .dropdown-submenu {
        z-index: 9999 !important;
    }

    .hero,
    .section-box {
        position: relative;
        z-index: 9999 !important;
    }
}

.nav-dropdown {
    position: relative;
    z-index: 10000;
}

.dropdown-menu,
.dropdown-submenu {
    position: absolute !important;
    z-index: 9999 !important;
    display: none;
    background-color: #001e3c;
    min-width: 180px;
    padding: 0.5rem 0;
}

.nav-dropdown.open > .dropdown-menu,
.dropdown-menu .nav-dropdown.open > .dropdown-submenu {
    display: block;
}

.hero,
.section-box {
    position: relative;
    z-index: 1;
}

#about,
#about *,
.fade-in,
.fade-in.visible {
    position: relative;
    z-index: 1 !important;
}

.floating-submenu {
    display: none;
    position: fixed;
    background-color: #001e3c;
    z-index: 10000;
    min-width: 180px;
    border-radius: 0.5rem;
    padding: 0.5rem 0;
}

.floating-submenu li a {
    color: #fff;
    text-decoration: none;
    padding: 0.5rem 1rem;
    display: block;
    border: 1px solid red;
}

.floating-submenu li a:hover {
    background-color: #003366;
}