/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    background-color: #111827; /* 변경됨: 더 어두운 배경색 */
    color: #f9fafb;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', 'Noto Sans KR', serif;
    font-weight: 600;
    line-height: 1.2;
}

/* 특별한 제목용 폰트 */
.hero-title {
    font-family: 'Black Han Sans', 'Noto Sans KR', sans-serif !important;
    text-shadow: 0px 3px 3px rgba(0,0,0,0.5);
}

.section-title {
    font-family: 'Noto Sans KR', sans-serif;
    font-weight: 900;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 3rem;
    background: linear-gradient(135deg, #ffffff 0%, #d4af37 50%, #ffffff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.2rem;
    color: #d1d5db;
    max-width: 600px;
    margin: 0 auto;
}

/* Header and Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(26, 54, 93, 0.95);
    backdrop-filter: blur(20px);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    height: 40px;
    width: auto;
}

.brand-text {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: #d4af37;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: white;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 8px 0;
    position: relative;
}

.nav-menu a:hover {
    color: #d4af37;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #d4af37;
    transition: width 0.3s ease;
}

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

.btn-register {
    background: linear-gradient(135deg, #d4af37, #f6e05e);
    color: #1a365d !important;
    padding: 12px 24px !important;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-register:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(212, 175, 55, 0.3);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, #1a365d 0%, #2c5282 50%, #2d3748 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

#aiNetwork {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, transparent 0%, rgba(26, 54, 93, 0.8) 70%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px;
}

.organizers {
    margin-bottom: 40px;
}

.organizer-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.organizer-text {
    font-size: 1rem;
    color: #d4af37;
    font-weight: 500;
}

.organizer-logos {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.organizer-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
}

.organizer-separator {
    font-size: 1.5rem;
    color: #d4af37;
    font-weight: 300;
}

/* Hero Logo */
.hero-logo {
    margin-bottom: 30px;
    text-align: center;
}

.hero-logo-img {
    height: 80px;
    width: auto;
    opacity: 1;
    animation: logoFadeIn 1.5s ease forwards;
    filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.3));
}

@keyframes logoFadeIn {
    0% {
        opacity: 0;
        transform: scale(0.8) translateY(-20px);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.hero-title {
    margin-bottom: 40px;
}

.title-container {
    text-align: center;
}

.main-title-text {
    margin-bottom: 20px;
}

.title-main {
    font-size: 4rem;
    font-weight: 300;
    color: white;
    font-family: 'Playfair Display', serif;
    display: block;
    line-height: 1.1;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.5);
    margin-bottom: 16px;
}

.title-line-en {
    font-size: 1.8rem;
    font-weight: 400;
    color: #d4af37;
    font-family: 'Inter', sans-serif;
    margin-bottom: 24px;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
    margin-top: 24px;
}

.tagline {
    font-size: 1.3rem;
    color: #cbd5e0;
    font-style: italic;
    font-weight: 500;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
}

.title-line-en {
    font-size: 1.8rem;
    font-weight: 400;
    color: #cbd5e0;
    font-family: 'Inter', sans-serif;
    margin-bottom: 24px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease 1s forwards;
}

.subtitle {
    margin-top: 24px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease 1.5s forwards;
}

.tagline {
    font-size: 1.3rem;
    color: #d4af37;
    font-style: italic;
    font-weight: 500;
}

.hero-info {
    margin-bottom: 50px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease 2s forwards;
}

.info-line {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    flex-wrap: wrap;
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

.info-separator {
    color: #d4af37;
    font-size: 1.2rem;
    font-weight: 300;
}

.info-label {
    font-size: 0.9rem;
    color: #d4af37;
    font-weight: 500;
    white-space: nowrap;
}

.info-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    white-space: nowrap;
}

.animated-number {
    display: inline-block;
    font-weight: 700;
    color: #d4af37;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-cta {
    margin-bottom: 60px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease 2.5s forwards;
}

.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, #d4af37, #f6e05e);
    color: #1a365d;
    padding: 18px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(212, 175, 55, 0.4);
}

.cta-note {
    margin-top: 16px;
    color: #cbd5e0;
    font-size: 0.9rem;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid #d4af37;
    border-bottom: 2px solid #d4af37;
    transform: rotate(45deg);
}

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

/* Statistics Section */
.statistics {
    padding: 80px 0;
    background: #1f2937; /* 변경됨: 더 어두운 배경색 */
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.stat-item {
    text-align: center;
    padding: 40px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 700;
    color: #d4af37;
    margin-bottom: 12px;
    display: block;
}

.stat-label {
    font-size: 1.2rem;
    color: white;
    font-weight: 500;
}

/* About Section */
.about {
    padding: 100px 0;
    background: #1f2937; /* 변경됨: 더 어두운 배경색 */
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text {
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-text p {
    margin-bottom: 24px;
    color: #ffffff;
}

.signature-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.signature-image {
    width: 160px;
    height: 160px;
}

.chairman-photo {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    object-position: center top;
    box-shadow: 
        0 15px 35px rgba(26, 54, 93, 0.4),
        0 5px 15px rgba(0, 0, 0, 0.2),
        inset 0 0 0 1px rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.chairman-photo:hover {
    transform: scale(1.05);
    box-shadow: 
        0 20px 45px rgba(26, 54, 93, 0.5),
        0 8px 25px rgba(0, 0, 0, 0.3),
        inset 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.signature {
    text-align: center;
    padding: 30px;
    background: rgba(31, 41, 55, 0.8);
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border-top: 4px solid #d4af37;
}

.signature-title {
    font-weight: 600;
    color: #f3f4f6;
    margin-bottom: 8px;
    font-size: 1rem;
}

.signature-name {
    font-size: 1.8rem;
    font-family: 'Playfair Display', serif;
    font-weight: 600;
    color: #ffffff;
}

/* Partner Section */
.partner {
    padding: 100px 0;
    background: #111827; /* 변경됨: 더 어두운 배경색 */
}

.partner-content-centered {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.partner-logo-section {
    margin-bottom: 40px;
}

.kpc-logo {
    height: 80px;
    width: auto;
    margin-bottom: 20px;
    filter: drop-shadow(0 4px 12px rgba(26, 54, 93, 0.2));
    transition: transform 0.3s ease;
}

.kpc-logo:hover {
    transform: scale(1.05);
}

.partner-badge {
    display: inline-block;
    background: linear-gradient(135deg, #d4af37, #f6e05e);
    color: #1a365d;
    padding: 8px 20px;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.partner-info h3 {
    font-size: 2.5rem;
    color: #ffffff;
    margin-bottom: 24px;
    font-family: 'Playfair Display', serif;
}

.partner-info p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #f3f4f6;
    margin-bottom: 30px;
}

.partner-highlight {
    padding: 20px;
    background: rgba(31, 41, 55, 0.8);
    border-radius: 16px;
    border-left: 4px solid #d4af37;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.partner-highlight strong {
    color: #d4af37;
    font-size: 1.1rem;
}





/* Program Section */
.program {
    padding: 80px 0;
    background: #111827; /* 변경됨: 더 어두운 배경색 */
    color: white;
}

/* Simple Program Schedule Design */
.program-schedule {
    max-width: 800px;
    margin: 0 auto;
}

.schedule-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.schedule-row {
    display: flex;
    align-items: center;
    padding: 16px 24px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border-left: 4px solid #6b7280;
    transition: all 0.3s ease;
}

.schedule-row:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(8px);
}

.schedule-row.keynote {
    border-left-color: #3b82f6;
    background: rgba(59, 130, 246, 0.1);
}

.schedule-row.special {
    border-left-color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
}

.schedule-row.break {
    border-left-color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}

.schedule-row.panel {
    border-left-color: #8b5cf6;
    background: rgba(139, 92, 246, 0.1);
}

.time {
    font-size: 1.1rem;
    font-weight: 700;
    color: #d4af37;
    min-width: 80px;
    margin-right: 24px;
}

.event {
    font-size: 1rem;
    font-weight: 500;
    color: #f3f4f6;
    line-height: 1.4;
}

/* Mobile */
@media (max-width: 768px) {
    .schedule-row {
        padding: 12px 16px;
    }
    
    .time {
        min-width: 60px;
        margin-right: 16px;
        font-size: 1rem;
    }
    
    .event {
        font-size: 0.9rem;
    }
}

.program .section-header h2 {
    background: linear-gradient(135deg, #ffffff 0%, #d4af37 50%, #ffffff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.program .section-header p {
    color: #cbd5e0;
}

.program-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.program-card {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    padding: 32px;
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.program-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #d4af37, #f6e05e);
    transform: translateX(-100%);
    transition: transform 0.5s ease;
}

.program-card:hover {
    transform: translateY(-8px) scale(1.02);
    background: rgba(255, 255, 255, 0.18);
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.25),
        0 0 0 1px rgba(212, 175, 55, 0.2);
    border-color: rgba(212, 175, 55, 0.3);
}

.program-card:hover::before {
    transform: translateX(0);
}

.program-header {
    margin-bottom: 24px;
}

.session-badge {
    display: inline-block;
    background: linear-gradient(135deg, #d4af37, #f6e05e);
    color: #1a365d;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.special-badge {
    background: linear-gradient(135deg, #1a365d, #2c5282);
    color: #d4af37;
}

.program-card.special {
    border: 2px solid #d4af37;
    background: linear-gradient(135deg, rgba(26, 54, 93, 0.05), rgba(212, 175, 55, 0.05));
}

.program-card.special:hover {
    border-color: #1a365d;
    background: linear-gradient(135deg, rgba(26, 54, 93, 0.1), rgba(212, 175, 55, 0.1));
}

.program-header h3 {
    font-size: 1.4rem;
    color: #d4af37;
    margin-bottom: 0;
}

.program-topics {
    list-style: none;
    margin-bottom: 20px;
}

.program-topics li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: #e2e8f0;
}

.program-topics li::before {
    content: '●';
    position: absolute;
    left: 0;
    color: #d4af37;
    font-weight: bold;
}

.speaker {
    display: block;
    color: #cbd5e0;
    font-size: 0.85rem;
    font-style: italic;
    margin-top: 4px;
}

.program-description {
    color: #cbd5e0;
    font-style: italic;
    line-height: 1.6;
}

/* Schedule Section */
.schedule {
    padding: 100px 0;
    background: #f8fafc;
}

.schedule-container {
    max-width: 800px;
    margin: 0 auto;
}

.schedule-item {
    display: flex;
    gap: 30px;
    padding: 30px 0;
    border-bottom: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.schedule-item:hover {
    background: rgba(26, 54, 93, 0.05);
    margin: 0 -20px;
    padding: 30px 20px;
    border-radius: 10px;
}

.schedule-item.keynote {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.1), rgba(212, 175, 55, 0.05));
}

.schedule-item.break {
    background: linear-gradient(135deg, rgba(44, 82, 130, 0.1), rgba(44, 82, 130, 0.05));
}

.schedule-time {
    min-width: 150px;
    font-weight: 600;
    color: #1a365d;
    font-size: 1.1rem;
}

.schedule-content h4 {
    font-size: 1.3rem;
    color: #1a365d;
    margin-bottom: 8px;
}

.schedule-content p {
    color: #4a5568;
    line-height: 1.6;
}

/* Speakers Section */
.speakers {
    padding: 100px 0;
    background: #1f2937; /* 변경됨: 더 어두운 배경색 */
}

.speakers-grid {
    display: grid;
    gap: 40px;
}

.keynote-speakers {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    justify-content: center;
}

.session-speakers {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.speaker-img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 16px auto;
    border: 2px solid rgba(212, 175, 55, 0.5);
    filter: grayscale(30%);
    transition: filter 0.3s ease, transform 0.3s ease;
}

.speaker-card:hover .speaker-img {
    filter: grayscale(0%);
    transform: scale(1.05);
}

/* Utility classes for speakers section */
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-16 { margin-bottom: 4rem; }
.pb-2 { padding-bottom: 0.5rem; }
.border-b-2 { border-bottom-width: 2px; }
.border-yellow-600 { border-color: #d4af37; }
.inline-block { display: inline-block; }
.text-center { text-align: center; }
.text-2xl { font-size: 1.5rem; }
.font-bold { font-weight: 700; }
.text-gray-700 { color: #e5e7eb; }
.text-gray-600 { color: #d1d5db; }
.max-w-2xl { max-width: 42rem; }
.mx-auto { margin-left: auto; margin-right: auto; }

.speaker-card {
    text-align: center;
    padding: 40px 30px;
    background: rgba(31, 41, 55, 0.9);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(107, 114, 128, 0.3);
    border-radius: 20px;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.speaker-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.1), transparent);
    transition: left 0.6s ease;
}

.speaker-card:hover {
    transform: translateY(-8px);
    border-color: #d4af37;
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.4),
        0 0 0 1px rgba(212, 175, 55, 0.4);
    background: rgba(31, 41, 55, 1);
}

.speaker-card:hover::before {
    left: 100%;
}

.speaker-info h3 {
    font-size: 1.4rem;
    color: #ffffff;
    margin-bottom: 8px;
}

.speaker-title {
    color: #3b82f6;
    font-weight: 600;
    margin-bottom: 12px;
}

.speaker-description {
    color: #d1d5db;
    line-height: 1.6;
}

/* Venue Section */
.venue {
    padding: 100px 0;
    background: #111827; /* 변경됨: 더 어두운 배경색 */
}

.venue-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.venue-details h3 {
    font-size: 2rem;
    color: #ffffff;
    margin-bottom: 30px;
}

.venue-item {
    margin-bottom: 30px;
}

.venue-item strong {
    display: block;
    color: #d4af37;
    font-weight: 600;
    margin-bottom: 8px;
}

.venue-item p {
    color: #f3f4f6;
    margin-bottom: 12px;
}

.venue-item ul {
    list-style: none;
    padding-left: 0;
}

.venue-item li {
    padding: 6px 0;
    color: #f3f4f6;
}

.btn-map {
    display: inline-block;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    padding: 12px 24px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    margin-top: 20px;
}

.btn-map:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(26, 54, 93, 0.3);
}

.venue-map {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.venue-map iframe {
    border-radius: 20px;
}

/* Registration Section */
.registration {
    padding: 100px 0;
    background: #1f2937; /* 변경됨: 더 어두운 배경색 */
    color: white;
}

.registration .section-header h2 {
    background: linear-gradient(135deg, #ffffff 0%, #d4af37 50%, #ffffff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.registration .section-header p {
    color: #cbd5e0;
}

.registration-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.registration-highlights {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-bottom: 40px;
}

.highlight-item {
    padding: 24px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.highlight-item h4 {
    color: #d4af37;
    margin-bottom: 8px;
    font-size: 1.2rem;
}

.highlight-item p {
    color: #cbd5e0;
}

.contact-info {
    padding: 30px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.contact-info h4 {
    color: #d4af37;
    margin-bottom: 16px;
    font-size: 1.3rem;
}

.contact-info p {
    color: #e2e8f0;
    margin-bottom: 12px;
}

.registration-form {
    background: rgba(255, 255, 255, 0.1);
    padding: 40px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    color: #e2e8f0;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 16px;
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #d4af37;
    background: rgba(255, 255, 255, 0.15);
}

.form-group input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 12px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    font-weight: 400;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.btn-submit {
    width: 100%;
    background: linear-gradient(135deg, #d4af37, #f6e05e);
    color: #1a365d;
    padding: 16px;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(212, 175, 55, 0.4);
}

/* Footer */
.footer {
    padding: 60px 0 30px;
    background: #1a365d;
    color: white;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand {
    text-align: center;
}

.footer-logo {
    height: 60px;
    margin-bottom: 20px;
}

.footer-brand h3 {
    color: #d4af37;
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.footer-brand p {
    color: #cbd5e0;
}

.footer-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
}

.footer-section h4 {
    color: #d4af37;
    margin-bottom: 16px;
    font-size: 1.2rem;
}

.footer-section p {
    color: #cbd5e0;
    margin-bottom: 8px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #a0aec0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        display: none;
    }
    
    .title-main {
        font-size: 2.5rem;
    }
    
    .info-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .partner-content-centered {
        padding: 0 20px;
    }
    
    .kpc-logo {
        height: 60px;
    }
    
    .signature-image {
        width: 140px;
        height: 140px;
    }
    
    .title-main {
        font-size: 3rem;
        line-height: 1.2;
    }
    
    .hero-logo-img {
        height: 60px;
    }
    
    .info-line {
        flex-direction: column;
        gap: 20px;
        padding: 30px 20px;
    }
    
    .info-separator {
        display: none;
    }
    

    
    .program-grid {
        grid-template-columns: 1fr;
    }
    
    .schedule-item {
        flex-direction: column;
        gap: 12px;
    }
    
    .schedule-time {
        min-width: auto;
    }
    
    .venue-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .registration-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .footer-info {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .section-header h2 {
        font-size: 2.5rem;
    }
    
    .container {
        padding: 0 16px;
    }
}

@media (max-width: 480px) {
    .title-line {
        font-size: 2rem;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .organizer-logos {
        flex-direction: column;
        gap: 8px;
    }
    
    .organizer-separator {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .title-main {
        font-size: 2.2rem;
    }
    
    .title-line-en {
        font-size: 1.3rem;
    }
    
    .hero-logo-img {
        height: 50px;
    }
}

/* --- 이 아래 내용을 styles.css 파일에 추가하세요 --- */

/* 기존 스타일 */
#submission-success-message {
    display: none;
    padding: 20px;
    margin-top: 20px;
    background-color: #e6f4ea;
    color: #3c763d;
    border: 1px solid #d6e9c6;
    border-radius: 8px;
    text-align: center;
    font-size: 1.1em;
}

/* --- 주요 프로그램 섹션 수정 --- */
.program-slider-area {
    position: relative;
    max-width: 420px; /* 모바일/기본 최대 너비 */
    margin: 2rem auto;
}

@media (min-width: 768px) {
    .program-slider-area {
        max-width: 540px; /* 태블릿 너비 */
    }
}

@media (min-width: 1024px) {
    .program-slider-area {
        max-width: 600px; /* 데스크탑에서 너비 증가 */
    }
}

.program-slider-container {
    position: relative;
    width: 100%;
    margin: 0 auto;
    overflow: hidden;
}

.program-slider-wrapper {
    display: flex;
    /* transition은 JS에서 제어 */
}

.program-card-container {
    width: 100%;
    flex-shrink: 0;
    padding: 20px;
    box-sizing: border-box;
    perspective: 1500px; /* 3D 효과를 위한 원근감 */
}

.program-card-inner {
    position: relative;
    width: 100%;
    height: 480px; /* 카드 높이 조정 */
    transition: transform 0.8s;
    transform-style: preserve-3d;
    cursor: pointer;
}

.program-card-container:hover .program-card-inner {
    transform: rotateX(180deg); /* 위아래로 뒤집기 */
}

.program-card-front,
.program-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden; /* Safari */
    backface-visibility: hidden;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
}

.program-card-front {
    background-color: #ffffff;
}

.program-card-back {
    background-color: #313b4c;
    color: white;
    transform: rotateX(180deg); /* 위아래로 뒤집기 */
    padding: 20px;
    box-sizing: border-box;
    justify-content: center;
}

/* 카드 앞면 스타일 */
.program-card-front .program-header {
    background-color: #313b4c;
    color: #ffffff;
    padding: 1.5rem;
    border-radius: 12px 12px 0 0;
    flex-shrink: 0;
}

.program-card-front .session-badge {
    background-color: #f3b63a;
    color: #313b4c;
    padding: 0.3em 0.8em;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 700;
    display: inline-block;
    margin-bottom: 0.75rem;
}

.program-card-front .program-header h3 {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    margin: 0;
    line-height: 1.3;
}

.front-image-container {
    flex-grow: 1;
    overflow: hidden;
    background-color: #f0f0f0;
    border-radius: 0 0 12px 12px;
}

.front-image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.program-card-container:hover .front-image-container img {
    transform: scale(1.05);
}

/* 카드 뒷면 스타일 */
.program-card-back .program-content {
    text-align: left;
    overflow-y: auto; /* 내용이 길 경우 스크롤 */
    height: 100%;
    padding: 1rem;
}

.program-card-back h4 {
    font-size: 1.5rem;
    color: #f3b63a;
    margin-bottom: 1rem;
    font-weight: 700;
    font-family: 'Playfair Display', serif;
}

.program-card-back .program-topics {
    list-style: none;
    padding-left: 0;
    margin-bottom: 1.5rem;
}

.program-card-back .program-topics li {
    padding-left: 1.2em;
    text-indent: -1.2em;
    margin-bottom: 1rem;
    font-size: 0.95rem;
    color: #f0f0f0;
}

.program-card-back .program-topics li::before {
    content: '•';
    color: #f3b63a;
    margin-right: 0.5em;
    font-size: 1.2em;
}

.program-card-back .program-topics .speaker {
    display: block;
    font-size: 0.8rem;
    color: #ccc;
    margin-top: 4px;
}

.program-card-back .program-description {
    font-size: 0.9rem;
    color: #e0e0e0;
    line-height: 1.6;
}

/* 슬라이더 버튼 */
.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(255, 255, 255, 0.9);
    color: #333;
    border: 1px solid #ddd;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    transition: all 0.2s ease;
}

.slider-btn:hover {
    background-color: #f3b63a;
    color: white;
    border-color: #f3b63a;
}

.prev-btn { left: -22px; }
.next-btn { right: -22px; }

.checkbox-single-group {
    margin-top: 10px;
}

.checkbox-single-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
}

.checkbox-single-group input[type="checkbox"] {
    margin-right: 8px;
    width: 16px;
    height: 16px;
    accent-color: #f3b63a;
}

.privacy-notice {
    font-size: 0.8rem;
    color: #6c757d;
    margin-top: 10px;
}

/* --- Registration Modal Styles --- */
.modal-overlay {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: none; /* Initially hidden */
    align-items: center;
    justify-content: center;
    overflow-y: auto;
    padding: 20px;
}

.modal-content {
    position: relative;
    background-color: #1e293b; /* Dark background similar to the section */
    color: #f1f5f9;
    padding: 30px 40px;
    border-radius: 12px;
    width: 100%;
    max-width: 700px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    animation: slideIn 0.5s ease-out;
    display: flex;
    flex-direction: column;
    max-height: 90vh; /* 팝업의 최대 높이 제한 */
}

@media (max-width: 768px) {
    .modal-content {
        padding: 20px;
    }
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-close-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    color: #aaa;
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.2s;
}

.modal-close-btn:hover,
.modal-close-btn:focus {
    color: #f3b63a;
    text-decoration: none;
}

body.modal-open {
    overflow: hidden;
}

/* 폼 스크롤 컨테이너 */
.registration-form-container {
    overflow-y: auto; /* 내용이 넘칠 경우 세로 스크롤 생성 */
    flex-grow: 1; /* 남는 공간을 모두 차지하도록 설정 */
    padding-right: 15px; /* 스크롤바 공간 확보 */
    margin-right: -15px; /* 스크롤바 공간만큼 음수 마진 적용 */
}

/* Adjust form styles for modal */
.modal-content .section-header {
    text-align: center;
    margin-bottom: 2rem;
    padding: 0; /* Remove padding inherited from section */
    flex-shrink: 0; /* 헤더는 줄어들지 않음 */
}
.modal-content .section-header h2 {
    color: #fff;
}
.modal-content .section-header p {
    color: #cbd5e1;
}

.modal-content .registration-header-info {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    text-align: left;
    border-radius: 8px;
}

.modal-content .registration-header-info p {
     margin: 0.5rem 0;
    font-size: 0.95rem;
    color: #e2e8f0;
}
 .modal-content .registration-header-info strong {
    color: #e2e8f0;
     margin-right: 8px;
}

.modal-content .registration-form {
     max-width: 650px;
     margin: 0 auto;
}

.modal-content .form-group label,
.modal-content .checkbox-single-group label {
    color: #cbd5e1;
}

.modal-content input[type="text"],
.modal-content input[type="email"],
.modal-content input[type="tel"] {
    background-color: #334155;
    border: 1px solid #475569;
    color: #f1f5f9;
}
.modal-content input:focus {
    background-color: #475569;
}

.modal-content .privacy-notice {
    color: #94a3b8;
}

/* 모바일 UI 개선을 위한 추가 스타일 */
@media (max-width: 768px) {
    /* Statistics Section: '참가자, 연사, 세션, 시간' 블록을 한 줄로 표시 */
    .stats-grid {
        display: flex;
        justify-content: space-around;
        align-items: center;
        flex-wrap: nowrap; /* 한 줄에 표시되도록 설정 */
    }

    .stat-item {
        flex: 1; /* 각 아이템이 동일한 공간을 차지하도록 설정 */
        padding: 0 5px; /* 아이템 간의 최소 간격 확보 */
    }

    .stat-number {
        font-size: 2rem; /* 모바일 화면에 맞게 폰트 크기 조정 */
    }

    .stat-label {
        font-size: 0.75rem; /* 모바일 화면에 맞게 폰트 크기 조정 */
    }

    /* Speakers Section: 기조 연설 및 세션 발표자 블록을 2열 그리드로 변경 */
    .speakers-grid {
        grid-template-columns: repeat(2, 1fr); /* 2열 그리드 레이아웃 */
        gap: 1rem; /* 카드 사이의 간격 조정 */
    }

    .speaker-card h3 {
        font-size: 1rem; /* 이름 폰트 크기 조정 */
    }

    .speaker-card p {
        font-size: 0.8rem; /* 직책/설명 폰트 크기 조정 */
    }
    
    /* 히어로 섹션 정보 라인 개선 */
    .hero-info .info-line {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0 1rem;
    }

    .hero-info .info-separator {
        display: none; /* 모바일에서는 구분선 숨기기 */
    }
}