/* Global Styles */
:root {
    --primary-color: #27b682;
    --secondary-color: #3fc3db;
    --accent-color: #3e56a5;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --gray-color: #64748b;
    --success-color: #27b682;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --scroll-behavior: smooth;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* 헤더 높이만큼 스크롤 패딩 추가 */
}

body {
    font-family: 'Pretendard', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 15px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--secondary-color);
    border-radius: 2px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-weight: 600;
    border: none;
    cursor: pointer;
    text-align: center;
}

.btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

.btn-youtube {
    background-color: #FF0000;
    padding: 15px 30px;
    font-size: 1rem;
}

.btn-youtube:hover {
    background-color: #cc0000;
}

.btn-download {
    background-color: #fff;
    color: var(--primary-color);
    padding: 15px 30px;
    font-size: 1rem;
    border: 2px solid #fff;
}

.btn-download:hover {
    background-color: transparent;
    color: #fff;
    border-color: #fff;
}

/* Header Styles */
header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1001;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    height: 50px;
}

.logo img {
    height: 100%;
    width: auto;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-menu li a {
    font-weight: 600;
    position: relative;
    padding: 5px 0;
}

.nav-menu li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-color);
    transition: var(--transition);
}

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

.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--dark-color);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: url('../images/bg.png') center center/cover no-repeat;
    color: #fff;
    padding: 200px 0 150px;
    padding-top: 280px;
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 80vh;
    z-index: 1;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1;
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
    animation: fadeInUp 1s ease-out forwards;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.3;
}

.hero .subtitle {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.logo-badge {
    width: 200px;
    margin: 40px auto 0;
    background-color: #fff;
    padding: 15px 20px 10px 20px;
    border-radius: 10px;
}

/* About Section */
.about-section {
    padding: 100px 0;
    background-color: #fff;
}

.about-content {
    display: flex;
    gap: 60px;
    align-items: center;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.about-text {
    flex: 1;
}

.about-text p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: var(--gray-color);
}

.about-image {
    flex: 1;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

/* Program Section */
.program-section {
    padding: 100px 0;
    background-color: #f0fdf9;
}

.program-days {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.program-day {
    background-color: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.program-day:nth-child(2) {
    transition-delay: 0.2s;
}

.program-day:nth-child(3) {
    transition-delay: 0.4s;
}

.program-day:nth-child(4) {
    transition-delay: 0.6s;
}

.program-day:nth-child(5) {
    transition-delay: 0.8s;
}

.day-title {
    background-color: var(--primary-color);
    color: #fff;
    padding: 15px 20px;
    font-size: 1.3rem;
    font-weight: 600;
}

.day-title span {
    font-weight: 400;
    opacity: 0.8;
    font-size: 1rem;
}

.program-schedule {
    padding: 20px;
}

.schedule-item {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: 20px;
    padding: 15px 0;
    border-bottom: 1px solid #e2e8f0;
    transition: background-color 0.3s ease;
}

.schedule-item:hover {
    background-color: rgba(39, 182, 130, 0.05);
}

.schedule-item:last-child {
    border-bottom: none;
}

.time {
    font-weight: 600;
    color: var(--primary-color);
}

.event {
    font-weight: 500;
}

.location {
    color: var(--gray-color);
    text-align: right;
}

/* Video Section */
.video-section {
    padding: 100px 0;
    background-color: #fff;
    text-align: center;
}

.video-container {
    margin-bottom: 40px;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transform: scale(0.95);
    transition: transform 0.3s ease;
    position: relative;
    padding-bottom: 56.25%; /* 16:9 비율 */
    height: 0;
    width: 100%;
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.video-container:hover {
    transform: scale(1);
}

.youtube-button {
    margin-top: 50px;
    animation: bounce 2s infinite;
}

/* MFDS Section */
.mfds-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #3e56a5 0%, #3fc3db 50%, #27b682 100%);
    color: #fff;
    text-align: center;
}

.mfds-section .section-title {
    color: #fff;
}

.mfds-section .section-title::after {
    background-color: #fff;
}

.mfds-desc {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 40px;
    opacity: 0.9;
}

.download-button {
    margin-top: 40px;
    animation: pulse 2s infinite;
}

/* Materials Section */
.materials-section {
    padding: 100px 0;
    background-color: #f8f9fa;
}

.materials-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #fff;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.materials-text p {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--gray-color);
}

.materials-icon {
    font-size: 4rem;
    color: var(--primary-color);
    animation: float 3s ease-in-out infinite;
}

/* Footer */
footer {
    background-color: var(--dark-color);
    color: #fff;
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 30px;
}

.footer-logo {
    margin-bottom: 20px;
}

.footer-logo img {
    height: 60px;
}

.footer-info {
    max-width: 500px;
}

.footer-info p, .footer-info address {
    margin-bottom: 10px;
    opacity: 0.8;
    font-style: normal;
    font-size: 0.9rem;
}

.footer-social {
    display: flex;
    gap: 15px;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: var(--transition);
}

.footer-social a:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--box-shadow);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 99;
}

.back-to-top.active {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--secondary-color);
    transform: translateY(-5px);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes float {
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
    100% {
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* Responsive Design */
@media (max-width: 992px) {
    .about-content {
        flex-direction: column;
    }
    
    .schedule-item {
        grid-template-columns: 1fr;
        gap: 5px;
    }
    
    .location {
        text-align: left;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 80px;
        flex-direction: column;
        background-color: #fff;
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: 0 10px 10px rgba(0, 0, 0, 0.1);
        padding: 20px 0;
        gap: 15px;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: block;
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .hero {
        padding: 120px 0 80px;
        padding-top: 200px;
        min-height: 60vh;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .materials-content {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }
    
    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
        margin-top: 20px;
    }
}

@media (max-width: 576px) {
    .hero h1 {
        font-size: 1.5rem;
    }
    
    .hero .subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
}

/* Page Title */
.page-title {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    padding: 120px 0 40px;
    text-align: center;
    margin-bottom: 40px;
}

.page-title h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
}

/* Archive Section */
.archive-section {
    padding: 40px 0 100px;
}

.materials-list {
    margin-bottom: 60px;
}

.material-item {
    display: grid;
    grid-template-columns: 180px 1fr 150px;
    gap: 20px;
    background-color: #fff;
    margin-bottom: 10px;
    padding: 20px 25px;
    border-radius: var(--border-radius);
    align-items: center;
    transition: var(--transition);
}

.material-item:nth-child(odd) {
    background-color: #e9f7ff;
}

.material-item:nth-child(even) {
    background-color: #fff9e6;
}

.material-item.appendix {
    background-color: #e2e2e2;
    padding-left: 220px;
    grid-template-columns: 1fr 150px;
}

.material-item:hover {
    box-shadow: var(--box-shadow);
    transform: translateY(-2px);
}

.material-name {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.presentation-item {
    display: flex;
    align-items: center;
}

.flag-icon {
    position: relative;
    padding-left: 35px;
}

.flag-icon::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border: 1px solid #ddd;
}

.flag-cambodia::before {
    background-image: url('https://flagcdn.com/w20/kh.png');
}

.flag-indonesia::before {
    background-image: url('https://flagcdn.com/w20/id.png');
}

.flag-malaysia::before {
    background-image: url('https://flagcdn.com/w20/my.png');
}

.flag-mongolia::before {
    background-image: url('https://flagcdn.com/w20/mn.png');
}

.flag-nepal::before {
    background-image: url('https://flagcdn.com/w20/np.png');
}

.flag-pakistan::before {
    background-image: url('https://flagcdn.com/w20/pk.png');
}

.flag-philippines::before {
    background-image: url('https://flagcdn.com/w20/ph.png');
}

.flag-tajikistan::before {
    background-image: url('https://flagcdn.com/w20/tj.png');
}

.flag-thailand::before {
    background-image: url('https://flagcdn.com/w20/th.png');
}

.flag-vietnam::before {
    background-image: url('https://flagcdn.com/w20/vn.png');
}

.material-title {
    font-size: 1rem;
    color: var(--dark-color);
}

.material-download {
    text-align: right;
}

.btn-archive-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--primary-color);
    color: #fff;
    font-size: 0.9rem;
    border-radius: 4px;
    transition: var(--transition);
}

.btn-archive-download:hover {
    background-color: var(--secondary-color);
    box-shadow: var(--box-shadow);
    transform: translateY(-2px);
}

/* Presentation Item Styling */
.presentation-yellow {
    background-color: #fef3c7;
}

.presentation-green {
    background-color: #d1fae5;
}

.presentation-gray {
    background-color: #64748b;
    color: white;
}

.presentation-gray .material-name {
    font-weight: 700;
    font-size: 1.3rem;
}

/* Appendix Section Styling */
.appendix-section {
    margin: 20px 0;
    background-color: #f9f9f9;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.appendix-header {
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
    padding: 12px 20px;
    background-color: #3e56a5;
}

.appendix-items {
    padding: 0;
}

.appendix-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid #eee;
}

.appendix-item:last-child {
    border-bottom: none;
}

.appendix-title {
    color: #333;
    font-weight: 500;
    font-size: 1rem;
    flex: 1;
}

.appendix-download {
    margin-left: 20px;
}

.btn-download {
    background-color: #3e56a5;
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
    font-weight: 500;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: all 0.3s ease;
}

.btn-download i {
    margin-right: 8px;
    font-size: 1.2rem;
}

.btn-download:hover {
    background-color: #27b682;
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* Responsive styling for appendix */
@media (max-width: 768px) {
    .appendix-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .appendix-title {
        margin-bottom: 10px;
    }
    
    .appendix-download {
        margin-left: 0;
    }
}

/* Responsive adjustments for archive page */
@media (max-width: 992px) {
    .material-item {
        grid-template-columns: 150px 1fr 120px;
        padding: 15px 20px;
    }
    
    .material-item.appendix {
        padding-left: 180px;
    }
}

@media (max-width: 768px) {
    .material-item {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .material-item.appendix {
        padding-left: 15px;
        grid-template-columns: 1fr;
    }
    
    .material-download {
        text-align: left;
    }
    
    .page-title {
        padding: 100px 0 30px;
    }
    
    .page-title h1 {
        font-size: 2rem;
    }
}

/* Program & Materials links */
.program-link, .materials-link {
    text-align: center;
    margin-top: 40px;
}

.program-link .btn, .materials-link .btn {
    padding: 12px 28px;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.program-link .btn:hover, .materials-link .btn:hover {
    transform: translateY(-3px);
}

/* Archive Year Section */
.year-archives {
    display: flex;
    flex-direction: column;
    gap: 50px;
    margin-bottom: 50px;
}

.archive-year {
    background-color: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.year-title {
    background-color: var(--primary-color);
    color: #fff;
    padding: 15px 30px;
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
}

.archive-content {
    display: flex;
    padding: 30px;
    gap: 40px;
    align-items: center;
}

.archive-image {
    flex: 1;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.archive-screenshot {
    width: 100%;
    height: auto;
    transition: transform 0.3s ease;
}

.archive-screenshot:hover {
    transform: scale(1.03);
}

.archive-description {
    flex: 1;
}

.archive-description h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.archive-description p {
    margin-bottom: 25px;
    color: var(--gray-color);
    font-size: 1.1rem;
}

.archive-btn {
    display: inline-block;
    padding: 10px 25px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: var(--transition);
}

.archive-btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: var(--box-shadow);
}

/* Responsive Archive */
@media (max-width: 992px) {
    .archive-content {
        flex-direction: column;
        text-align: center;
    }
    
    .archive-image {
        margin-bottom: 20px;
    }
    
    .year-title {
        font-size: 1.8rem;
        text-align: center;
    }
}

@media (max-width: 576px) {
    .year-title {
        font-size: 1.5rem;
    }
    
    .archive-content {
        padding: 20px;
    }
    
    .archive-description h3 {
        font-size: 1.3rem;
    }
}

/* Archive Detail Styles */
.archive-detail-section {
    padding: 50px 0;
}

.archive-detail-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.archive-detail-content h2 {
    font-size: 28px;
    margin-bottom: 30px;
    text-align: center;
    color: #333;
}

.archive-detail-image {
    width: 100%;
    margin-bottom: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    overflow: hidden;
}

.detail-screenshot {
    width: 100%;
    height: auto;
    display: block;
}

.back-button-container {
    margin-top: 20px;
    text-align: center;
}

.back-btn {
    background-color: #4a7c59;
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.back-btn:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
}

/* Popup Styles */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000; /* Ensure popup is above other content */
}

.popup-content {
    background-color: #fff;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    position: relative;
    text-align: center;
}

.popup-content img {
    max-width: 100%;
    max-height: 80vh; /* Limit image height */
    display: block;
    margin: 0 auto;
}

.popup-close {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 24px;
    font-weight: bold;
    color: var(--gray-color);
    cursor: pointer;
    transition: var(--transition);
}

.popup-close:hover {
    color: var(--dark-color);
}