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

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

.site-header {
    background-color: #001e3c;
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    box-shadow: 0 0.1rem 0.5rem rgba(0, 0, 0, 0.1);
}

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

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

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

.nav-list a.active,
.nav-list a:hover {
    color: #66ccff;
}

.hero-service {
    background: url('https://images.unsplash.com/photo-1504384308090-c894fdcc538d') center center / cover no-repeat fixed;
    height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    color: #fff;
}

.hero-sub .overlay {
    
    width: 100%;
    height: 100%;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero-sub h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

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

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

.section-title {
    font-size: 2rem;
    color: #003366;
    margin-bottom: 2rem;
    text-align: center;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    text-align: center;
}

.problem-item {
    background: #fff;
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.05);
    font-size: 1rem;
}

.solution-flow {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 1.1rem;
    font-weight: bold;
    color: #003366;
}

.solution-flow .arrow {
    color: #888;
}

.tech-feature {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
    text-align: center;
}

.tech-item {
    background-color: #fff;
    padding: 2rem 1.5rem;
    border-radius: 1rem;
    box-shadow: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.05);
}

.tech-item h3 {
    font-size: 1.2rem;
    color: #003366;
    margin-bottom: 0.5rem;
}

.tech-item p {
    font-size: 0.95rem;
    color: #555;
}

.stats {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 2rem;
    text-align: center;
}

.stat {
    flex: 1 1 20%;
    background-color: #f0f4f8;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 0.1rem 0.5rem rgba(0, 0, 0, 0.05);
}

.stat strong {
    display: block;
    font-size: 2rem;
    color: #001e3c;
}

.stat span {
    font-size: 1rem;
    color: #444;
    margin-top: 0.5rem;
}

.center {
    text-align: center;
}

.btn {
    display: inline-block;
    margin-top: 1.5rem;
    padding: 0.75rem 2rem;
    background-color: #001e3c;
    color: #fff;
    text-decoration: none;
    border-radius: 2rem;
    transition: background-color 0.3s ease;
    font-size: 1rem;
}

.btn:hover {
    background-color: #003366;
}

footer {
    background-color: #111;
    color: #fff;
    text-align: center;
    padding: 2rem 0;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .hero-sub h1 {
        font-size: 1.8rem;
    }
    .section-title {
        font-size: 1.5rem;
    }
    .stat {
        flex: 1 1 100%;
    }
    .solution-flow {
        font-size: 1rem;
    }
}

.nav-dropdown {
    position: relative;
    display: flex;
    align-items: center;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #001e3c;
    padding: 0.5rem 0;
    border-radius: 0.5rem;
    box-shadow: 0 0.3rem 0.7rem rgba(0, 0, 0, 0.15);
    z-index: 999;
    min-width: 160px;
    list-style: none;
    margin: 0;
}

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

.dropdown-menu li {
    padding: 0.5rem 1.5rem;
    white-space: nowrap;
    list-style: none;
    margin: 0;
}

.dropdown-menu li a {
    color: #fff;
    font-size: 0.95rem;
    text-decoration: none;
    display: block;
    padding: 0.25rem 0;
}

.dropdown-menu li a:hover {
    background-color: #003366;
}