/* 헤더 스타일 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    width: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
}

.subpage_top .text-box{
    background: rgba(0, 0, 0, 0.5) !important;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-section img {
    height: 40px;
    width: auto;
}

.logo-text {
    color: #fff;
    margin: 0;
    font-size: 1.5rem;
    font-weight: bold;
}

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

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #007bff;
}

.nav-menu a.active {
    color: #007bff;
}

/* 햄버거 메뉴 버튼 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* Features 섹션 스타일 */
.sub-section {
    padding: 60px 0 30px 0;
    background: #f8f9fa;
    min-height: 40vh;
}

.feature-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 3rem;
    color: #007bff;
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: #333;
}

.feature-description {
    color: #666;
    line-height: 1.6;
}

/* 메인 비디오 섹션 */
.top {
    height: 450px;
}

.top video {
    height: 100%;
    object-fit: cover;
}

.text-box {
    height: 450px;
}

.subpage_top{
    height: 450px;
}

.subpage_top .text-box{
    height: 450px;
}

/* 반응형 스타일 */
@media (max-width: 768px) {

    .header{padding-left: 5vw; padding-right:5vw; box-sizing: border-box;}

    .subpage_top h1 b{font-size: 10vw}

    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(0, 0, 0, 0.7);
        backdrop-filter: blur(10px);
        flex-direction: column;
        gap: 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        padding: 1rem 0;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-menu a {
        display: block;
        padding: 5vw 2rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-menu a:last-child {
        border-bottom: none;
    }

    /* 햄버거 메뉴 애니메이션 */
    .hamburger.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .sub-section{
        padding-top: 15vw;
        padding-bottom: 5vw;
    }
}