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

:root {
    --primary-color: #2ecc71;
    --secondary-color: #27ae60;
    --accent-color: #3498db;
    --dark-color: #1a1a2e;
    --light-color: #f8f9fa;
    --text-color: #333;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
    --gradient-3: linear-gradient(135deg, #3498db 0%, #2ecc71 100%);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 15px 40px rgba(0, 0, 0, 0.2);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--light-color);
}

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

/* Navbar */
.navbar {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 15px;
    color: white;
}

.nav-brand i {
    font-size: 2.5rem;
    color: var(--primary-color);
    animation: rotate 10s linear infinite;
}

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

.brand-text h1 {
    font-size: 1.5rem;
    margin: 0;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-text p {
    font-size: 0.85rem;
    margin: 0;
    color: #bbb;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1rem;
    flex-wrap: wrap;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.nav-menu a:hover, .nav-menu a.active {
    background: var(--gradient-2);
    transform: translateY(-2px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #2ecc71 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
}

.hero-content {
    position: relative;
    z-index: 2;
    color: white;
    padding: 2rem;
}

.hero-animation {
    animation: float 3s ease-in-out infinite;
    margin-bottom: 2rem;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.hero-date {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.fade-in {
    animation: fadeIn 1s ease-in;
}

.fade-in-delay-1 {
    animation: fadeIn 1s ease-in 0.3s both;
}

.fade-in-delay-2 {
    animation: fadeIn 1s ease-in 0.6s both;
}

.fade-in-delay-3 {
    animation: fadeIn 1s ease-in 0.9s both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-2);
    color: white;
    box-shadow: 0 5px 15px rgba(46, 204, 113, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(46, 204, 113, 0.5);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid white;
}

.btn-secondary:hover {
    background: transparent;
    color: white;
    transform: translateY(-3px);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* Features Section */
.features {
    padding: 5rem 0;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    font-size: 3rem;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--dark-color);
}

/* Timeline */
.timeline {
    padding: 5rem 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.timeline-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.timeline-item {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
}

.timeline-item:hover {
    transform: scale(1.05);
}

.timeline-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.timeline-content h3 {
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

.timeline-content p {
    font-weight: bold;
    color: var(--primary-color);
}

/* CTA Section */
.cta-section {
    padding: 5rem 0;
    background: var(--gradient-3);
    color: white;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

/* Page Header */
.page-header {
    background: var(--gradient-3);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.2rem;
}

/* Content Section */
.content-section {
    padding: 3rem 0;
}

.content-grid {
    display: grid;
    gap: 2rem;
}

.content-card {
    background: white;
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.content-card:hover {
    box-shadow: var(--shadow-hover);
}

.card-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.content-card h2 {
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.styled-list {
    list-style: none;
    padding-left: 0;
}

.styled-list li {
    padding: 0.5rem 0;
    padding-left: 2rem;
    position: relative;
}

.styled-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

/* Speakers Grid */
.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.speaker-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
}

.speaker-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.speaker-image {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.speaker-info h3 {
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.speaker-title {
    color: #666;
    font-style: italic;
    margin-bottom: 0.5rem;
}

.speaker-affiliation, .speaker-specialty {
    font-size: 0.9rem;
    color: #777;
    margin: 0.3rem 0;
}

/* Registration */
.registration-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 2rem;
}

.pricing-table {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.price-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
}

.price-card.featured {
    border: 3px solid var(--primary-color);
    transform: scale(1.05);
}

.price-card:hover {
    transform: scale(1.1);
}

.price-card h3 {
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.price {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: 1rem 0;
}

.price-card ul {
    list-style: none;
    padding: 0;
}

.price-card li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #eee;
}

/* Forms */
.registration-form-container, .contact-form-section {
    background: white;
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.registration-form h2, .contact-form h2 {
    color: var(--dark-color);
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.1);
}

/* Team Grid */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.team-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
}

.team-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.team-member-icon {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.team-role {
    color: var(--primary-color);
    font-weight: bold;
    margin: 0.5rem 0 1rem;
}

.team-contact p {
    font-size: 0.9rem;
    margin: 0.3rem 0;
}

/* Topics Container */
.topics-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.topic-category {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 10px;
    border-left: 4px solid var(--primary-color);
}

.topic-category h4 {
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.topic-category ul {
    list-style: none;
    padding: 0;
}

.topic-category li {
    padding: 0.3rem 0;
    color: #555;
    font-size: 0.9rem;
}

.topic-category li::before {
    content: '▸ ';
    color: var(--primary-color);
}

/* Dates Table */
.dates-table {
    margin-top: 1.5rem;
}

.date-row {
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid #eee;
}

.date-label {
    font-weight: 500;
    color: var(--dark-color);
}

.date-value {
    color: var(--primary-color);
    font-weight: bold;
}

/* Publications */
.publications-list {
    margin: 2rem 0;
}

.publication-card {
    display: flex;
    gap: 2rem;
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
}

.publication-card:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-hover);
}

.publication-year {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    min-width: 100px;
}

.publication-details h3 {
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.publication-doi {
    font-size: 0.9rem;
    color: #666;
    font-style: italic;
}

.journals-list {
    list-style: none;
    padding: 0;
}

.journals-list li {
    padding: 0.8rem;
    margin: 0.5rem 0;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

/* Committee */
.committee-section {
    margin: 3rem 0;
}

.committee-section h2 {
    color: var(--dark-color);
    margin-bottom: 2rem;
}

.committee-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.committee-card {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
}

.committee-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.committee-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.committee-card h4 {
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.committee-card p {
    font-size: 0.9rem;
    color: #666;
}

.organizing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.organizing-card {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
}

.committee-role {
    color: var(--primary-color);
    font-weight: bold;
    font-size: 0.9rem;
}

/* Contact */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 2rem;
}

.contact-info-section {
    background: white;
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.contact-info-card {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    margin: 1rem 0;
    background: #f8f9fa;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.contact-info-card:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(10px);
}

.contact-info-card:hover .contact-icon i {
    color: white;
}

.contact-icon {
    font-size: 2rem;
    color: var(--primary-color);
}

.contact-info-card h4 {
    margin-bottom: 0.3rem;
}

.social-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid #eee;
}

.social-links-large {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links-large a {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-2);
    color: white;
    border-radius: 50%;
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

.social-links-large a:hover {
    transform: translateY(-5px) rotate(360deg);
}

.map-section {
    margin-top: 3rem;
}

.map-placeholder {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 4rem 2rem;
    border-radius: 15px;
    text-align: center;
    color: white;
}

.map-placeholder i {
    margin-bottom: 1rem;
}

/* Stats Section */
.stats-section {
    margin: 3rem 0;
    padding: 3rem;
    background: var(--gradient-3);
    border-radius: 15px;
}

.stats-section .section-title {
    color: white;
    background: none;
    -webkit-text-fill-color: white;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    color: white;
    transition: all 0.3s ease;
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.1rem;
}

/* Info Box */
.info-box {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2.5rem;
    border-radius: 15px;
    margin-top: 2rem;
    text-align: center;
}

.info-box h3 {
    margin-bottom: 1rem;
}

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 10px;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-left: 4px solid #28a745;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border-left: 4px solid #dc3545;
}

/* Attendee Tags */
.attendee-types {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
}

.attendee-tag {
    background: var(--gradient-2);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

/* Registration Benefits */
.registration-benefits {
    margin-top: 2rem;
    padding: 2rem;
    background: #f8f9fa;
    border-radius: 10px;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.benefit-card {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.benefit-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.benefit-card h3 {
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.benefit-card p {
    color: #666;
    font-size: 0.9rem;
}

/* CTA Card */
.cta-card {
    background: var(--gradient-3);
    color: white;
    text-align: center;
}

.cta-card h2 {
    color: white;
}

/* Footer */
.footer {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section li {
    margin: 0.5rem 0;
}

.footer-section a {
    color: #bbb;
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-section a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-section p {
    color: #bbb;
    margin: 0.5rem 0;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-5px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #bbb;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 100%;
        left: 0;
        background: #1a1a2e;
        padding: 1rem;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .registration-container,
    .contact-container {
        grid-template-columns: 1fr;
    }

    .publication-card {
        flex-direction: column;
        text-align: center;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .btn {
        width: 100%;
    }

    .pricing-table {
        grid-template-columns: 1fr;
    }
}