/* ============================================
   Header
   ============================================ */
   .header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10000; 
    padding: 23px 0;
    background: transparent;
    transition: background var(--transition);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

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

.logo {
    font-family: var(--font-primary);
    font-size: 17px;
    font-weight: 400;
    letter-spacing: 2.55px;
}

.logo a {
    transition: opacity var(--transition);
}

.logo a:hover {
    opacity: 0.7;
}

.nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    gap: 48px;
}

.nav-list a {
    font-size: 14px;
    font-weight: 300;
    letter-spacing: 0;
    transition: opacity var(--transition);
}

.nav-list a:hover {
    opacity: 0.7;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 24px;
}

.link {
    font-size: 13px;
    font-weight: 400;
    transition: opacity var(--transition);
}

.link:hover {
    opacity: 0.7;
}

.btn-event {
    padding: 7px 20px;
    font-size: 12px;
    letter-spacing: 0.6px;
    color: var(--color-black);
    background: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 90px;
    transition: all var(--transition);
}

.menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 24px;
    position: relative;
}

.menu-toggle span,
.menu-toggle span::before,
.menu-toggle span::after {
    position: absolute;
    width: 100%;
    height: 2px;
    background: var(--color-white);
    transition: all var(--transition);
}

.menu-toggle span {
    top: 50%;
    transform: translateY(-50%);
}

.menu-toggle span::before,
.menu-toggle span::after {
    content: '';
    left: 0;
}

.menu-toggle span::before {
    top: -8px;
}

.menu-toggle span::after {
    bottom: -8px;
}

/* 햄버거 버튼 활성화 (X 모양) */
.menu-toggle.open span {
    background: transparent;
}

.menu-toggle.open span::before {
    top: 0;
    transform: rotate(45deg);
    background: var(--color-black);
}

.menu-toggle.open span::after {
    bottom: 0;
    transform: rotate(-45deg);
    background: var(--color-black);
}

.header.gnb-open {
    background: transparent;
    border-bottom: none;
}

.header.gnb-open .logo,
.header.gnb-open .nav,
.header.gnb-open .header-actions .link,
.header.gnb-open .header-actions .btn-event {
    opacity: 0;
    pointer-events: none;
}

/* ============================================
   GNB Menu
   ============================================ */

.gnb-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.8s cubic-bezier(0.23, 1, 0.320, 1), visibility 0.8s;
}

.gnb-overlay.open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.gnb-container {
    position: relative;
    width: 100%;
    height: 100%;
    background-color: #fff;
    transform: translateY(-100%);
    transition: transform 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}

.gnb-overlay.open .gnb-container {
    transform: translateY(0%);
}

.gnb-content {
    position: relative;
    width: 100%;
    height: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-anchor: none;
}

/* GNB Background */
.gnb-bg {
    position: relative;
    flex: 0 0 30%;
    max-width: 400px;
    height: 500px;
    background: url('../assets/img/image_gnb01.png') no-repeat center center;
    background-size: contain;
    z-index: 1;
    opacity: 0;
    transition: opacity 0.7s ease 0.5s;
}

.gnb-overlay.open .gnb-bg {
    opacity: 1;
}

.gnb-bg-text {
    position: absolute;
    top: 20px;
    left: -50px;
    display: flex;
    flex-direction: column;
    gap: 0;
    font-family: var(--font-accent);
    font-size: 32px;
    font-weight: 400;
    line-height: 1.2;
    color: #0F112B;
    letter-spacing: 1px;
}

.gnb-bg-decoration {
    position: absolute;
    bottom: 20px;
    left: -35px;
    width: 80px;
    height: auto;
    opacity: 0.9;
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* GNB Header */
.gnb-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: 25px 0;
    z-index: 10;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.5s ease 0.3s;
    pointer-events: none;
}

.gnb-overlay.open .gnb-header {
    opacity: 1;
    transform: translateY(0);
}

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

.gnb-logo {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: auto;
}

.gnb-logo a {
    font-size: 17px;
    font-weight: 400;
    letter-spacing: 2.55px;
    color: #000000;
}

.gnb-header-actions {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-left: auto;
    margin-right: 80px;
    pointer-events: auto;
}

.gnb-link {
    font-family: var(--font-secondary);
    font-size: 13px;
    font-weight: 400;
    color: #000000;
    transition: opacity 0.3s ease;
}

.gnb-link:hover {
    opacity: 0.7;
}

.gnb-btn-event {
    font-family: var(--font-secondary);
    padding: 7px 20px;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.6px;
    color: #ffffff;
    background: #000000;
    border: 1px solid #000000;
    border-radius: 90px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.gnb-btn-event:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* GNB Menu Grid */
.gnb-menu {
    flex: 0 0 70%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 60px;
    padding: 0;
    z-index: 2;
    position: relative;
}

.gnb-menu-item {
    position: relative;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.5s ease;
    text-align: center;
}

.gnb-menu-item::after {
    content: '';
    position: absolute;
    right: -30px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: #d0cfcc;
}

.gnb-menu-item:last-child::after {
    display: none;
}

.gnb-overlay.open .gnb-menu-item:nth-child(1) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.4s;
}

.gnb-overlay.open .gnb-menu-item:nth-child(2) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.5s;
}

.gnb-overlay.open .gnb-menu-item:nth-child(3) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.6s;
}

.gnb-overlay.open .gnb-menu-item:nth-child(4) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.7s;
}

.gnb-menu-title {
    font-family: var(--font-secondary);
    font-size: 18px;
    font-weight: 500;
    color: #4a90e2;
    margin-bottom: 15px;
    cursor: default;
}

.gnb-submenu {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.gnb-submenu li {
    padding: 0;
    margin: 0;
}

.gnb-submenu a {
    font-family: var(--font-secondary);
    font-size: 14px;
    font-weight: 400;
    color: #333333;
    transition: all 0.3s ease;
    line-height: 1.6;
}

.gnb-footer-actions {
    display: none;
    position: absolute;
    bottom: 40px;
    right: 0;
    gap: 24px;
    align-items: center;
    z-index: 10;
}

.gnb-footer-actions .gnb-link {
    font-family: var(--font-secondary);
    font-size: 13px;
    font-weight: 400;
    color: #000000;
    transition: opacity 0.3s ease;
}

.gnb-footer-actions .gnb-link:hover {
    opacity: 0.7;
}

.gnb-footer-actions .gnb-btn-event {
    font-family: var(--font-secondary);
    padding: 7px 20px;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.6px;
    color: #ffffff;
    background: #000000;
    border: 1px solid #000000;
    border-radius: 90px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.gnb-footer-actions .gnb-btn-event:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* ============================================
   Responsive - Tablet
   ============================================ */
@media (max-width: 1400px) {
    .gnb-content {
        padding: 80px 60px 100px;
        gap: 30px;
    }

    .gnb-bg {
        flex: 0 0 30%;
        max-width: 300px;
        height: 400px;
    }

    .gnb-menu-item::after {
        right: -20px;
    }

    .gnb-header {
        display: none;
    }

    .gnb-footer-actions {
        display: flex;
        bottom: 40px;
        right: 60px;
    }
}

@media (max-width: 1200px) {
    .container {
        padding: 0 40px;
    }

    .nav {
        display: none;
    }

    .header-actions .link,
    .header-actions .btn-event {
        display: none;
    }

}

/* ============================================
   Responsive - Mobile
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    /* 메인 헤더 */
    .header {
        padding: 20px 0;
    }

    .logo {
        font-size: 15px;
        letter-spacing: 2px;
    }

    /* GNB 헤더 */
    .gnb-header {
        display: block;
        padding: 20px 0;
    }
    
    .gnb-header .container {
        justify-content: flex-start;
    }

    .gnb-logo {
        position: static;
        transform: none;
    }

    .gnb-header-actions {
        display: none;
    }

    .menu-toggle{
        width: 24px;
    }

    /* GNB 컨텐츠 */
    .gnb-content {
        padding: 100px 30px 140px;
        flex-direction: column;
        justify-content:flex-start
    }

    .gnb-bg {
        display: none;
    }

    .gnb-menu {
        flex: none;
        display: flex;
        flex-direction: column;
        gap: 0;
        padding: 0;
        width: 100%;
    }

    .gnb-menu-item {
        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
        text-align: left;
    }

    .gnb-menu-item::after {
        display: none;
    }

    .gnb-menu-title {
        font-size: 16px;
        font-weight: 600;
        color: #000000;
        margin: 0;
        padding: 20px 0;
        cursor: pointer;
        position: relative;
        transition: color 0.3s ease;
    }

    .gnb-menu-title::after {
        content: '+';
        position: absolute;
        right: 0;
        font-size: 28px;
        font-weight: 300;
        line-height: 1;
        transition: all 0.3s ease;
    }

    .gnb-menu-item.active .gnb-menu-title {
        color: #4a90e2;
    }

    .gnb-menu-item.active .gnb-menu-title::after {
        content: '−';
        color: #4a90e2;
    }

    .gnb-submenu {
        overflow: hidden;
        height: 0;
        transition: height 0.35s ease;
    }

    .gnb-submenu a {
        font-size: 14px;
        display: block;
        transition: color 0.3s ease;
    }

    .gnb-submenu a:last-child {
        padding-bottom: 15px;
    }

    .gnb-submenu a:hover {
        color: #4a90e2;
    }

    /* GNB 하단 액션 버튼 */
    .gnb-footer-actions {
        display: flex;
        position: fixed;
        bottom: 30px;
        right: 30px;
        left: 30px;
        justify-content: flex-end;
        padding: 20px 0 0;
    }
}