body {
    font-family: 'Noto Sans KR', sans-serif;
    scroll-behavior: smooth;
}
.hero-bg {
    background: linear-gradient(135deg, rgba(0, 51, 102, 0.9) 0%, rgba(15, 23, 42, 0.85) 100%),
                url('../img/ceo2.jpg') center/cover no-repeat;
}
.nav-link.active {
    color: #C8102E;
    font-weight: 700;
    border-bottom: 2px solid #C8102E;
}
.tab-btn.active {
    background-color: #003366;
    color: #ffffff;
}
.tab-panel {
    display: none;
}
.tab-panel.active {
    display: block;
}
details > summary {
    list-style: none;
    cursor: pointer;
}
details > summary::-webkit-details-marker {
    display: none;
}
details[open] > summary .chevron {
    transform: rotate(180deg);
}