:root {
    --primary-color: #003366;
    --secondary-color: #0099cc;
    --accent-color: #ff6600;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --error-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --text-color: #333333;
    --text-light: #6c757d;
    --bg-light: #f8f9fa;
    --bg-dark: #022150;
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --border-radius: 8px;
    --transition-speed: 0.3s;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--primary-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-speed);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #004080;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

/* Header & Navigation */
#header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.scrolled {
    padding: 10px 0;
    background-color: white;
}

#header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px var(--spacing-md);
}

.logo-container {
    display: flex;
    flex-direction: column;
}

.logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.org-logo {
    height: 70px;
    width: auto;
    object-fit: contain;
    margin-bottom: 30px;
}

.org-logo2 {
    height: 60px;
    width: auto;
    object-fit: contain;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
}

.date {
    font-size: 0.9rem;
    color: var(--text-light);
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: var(--spacing-md);
}

.nav-links a {
    color: var(--text-color);
    font-weight: 600;
    padding: 5px;
    position: relative;
}

.nav-links a:hover, 
.nav-links a.active {
    color: var(--primary-color);
}

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

.nav-links a:hover::after, 
.nav-links a.active::after {
    width: 100%;
}

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

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 5px 0;
    transition: 0.4s;
}

/* Hero Section */
.hero {
    position: relative;
    height: 125vh;
    background-image: url('https://images.pexels.com/photos/3183150/pexels-photo-3183150.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=2');
    background-size: cover;
    background-position: center;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-lg);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(0, 51, 102, 0.8), rgba(0, 51, 102, 0.8));
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
    padding: 0 var(--spacing-md);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero h2 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: var(--spacing-lg);
}

.cta-button {
    margin-top: var(--spacing-md);
}

/* Highlights Section */
.highlights {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
}

.highlight-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-md);
}

.highlight-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: 0 4px 8px var(--shadow-color);
    transition: transform var(--transition-speed);
}

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

.highlight-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.highlight-card h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--primary-color);
}

/* Section Styling */
section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--secondary-color);
}

.section-description {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    color: var(--text-light);
}

/* About Section */
.about {
    background-color: white;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.about-text h3, .about-concept h3 {
    color: var(--primary-color);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

/* Tracks Section */
.tracks {
    background-color: var(--bg-light);
}

.tracks-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.track {
    background-color: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 5px var(--shadow-color);
}

.track-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
}

.track-header h3 {
    margin: 0;
    font-size: 1.2rem;
}

.track-toggle {
    font-size: 1.2rem;
    transition: transform var(--transition-speed);
}

.track-toggle.active {
    transform: rotate(45deg);
}

.track-content {
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-speed), padding var(--transition-speed);
}

.track-content.active {
    padding: var(--spacing-md);
    max-height: 500px;
}

.track-content ul {
    padding-left: var(--spacing-md);
}

.track-content li {
    margin-bottom: var(--spacing-xs);
}

/* Speakers Section */
.speakers {
    background-color: white;
}

.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.speaker-card {
    background-color: var(--bg-light);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 4px 8px var(--shadow-color);
    transition: transform var(--transition-speed);
}

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

.speaker-image {
    height: 200px;
    background-color: #ccc;
    background-size: cover;
    background-position: center;
}

.speaker-image.placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #e9e9e9;
    color: var(--text-light);
}

.speaker-image.placeholder::after {
    content: 'Speaker Photo';
    font-weight: 600;
    color: var(--text-light);
}

.speaker-info {
    padding: var(--spacing-md);
}

.speaker-title {
    color: var(--secondary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.speaker-bio {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Registration Section */
.registration {
    background-color: var(--bg-light);
}

.registration-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.registration-form {
    background-color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.important-dates {
    background-color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.form-group input, 
.form-group select, 
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-speed);
}

.form-group input:focus, 
.form-group select:focus, 
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(0, 153, 204, 0.2);
}

.form-checkbox {
    display: flex;
    align-items: center;
}

.form-checkbox input {
    width: auto;
    margin-right: var(--spacing-xs);
}

.form-checkbox label {
    margin-bottom: 0;
}

.error-message {
    display: block;
    color: var(--error-color);
    font-size: 0.9rem;
    margin-top: 5px;
}

.form-actions {
    margin-top: var(--spacing-lg);
}

.registration-info {
    padding: var(--spacing-md);
}

.fees-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-md);
}

.fees-table th, .fees-table td {
    padding: 10px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.fees-table th {
    background-color: var(--primary-color);
    color: white;
}

.fees-table tr:nth-child(even) {
    background-color: #f2f2f2;
}

.important-dates {
    margin-top: var(--spacing-lg);
}

.important-dates ul {
    list-style: none;
}

.important-dates li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--border-color);
}

/* Contact Section */
.contact {
    background-color: white;
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.contact-form-container {
    background-color: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.contact-info {
    padding: var(--spacing-md);
}

.contact-info h3 {
    margin-top: var(--spacing-md);
    color: var(--primary-color);
}

.contact-details p {
    margin-bottom: var(--spacing-xs);
}

.contact-details i {
    margin-right: var(--spacing-xs);
    color: var(--primary-color);
}

.map-container {
    margin-top: var(--spacing-md);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 5px var(--shadow-color);
}

#map {
    width: 100%;
    height: 250px;
    border-radius: var(--border-radius);
    overflow: hidden;
}

#map iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Footer */
.footer {
    background-color: var(--bg-dark);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-column h3 {
    color: white;
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-bottom: var(--spacing-xs);
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--secondary-color);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: #a8b2c0;
    transition: color var(--transition-speed);
}

.footer-links a:hover {
    color: white;
}

.social-icons {
    display: flex;
    gap: var(--spacing-sm);
}

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

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    color: #a8b2c0;
}

/* Responsive Design */
@media (max-width: 1024px) {
    h1 {
        font-size: 2.2rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .about-content,
    .registration-container,
    .contact-container {
        grid-template-columns: 1fr;
    }
    
    .registration-info, 
    .contact-info {
        order: -1;
    }
}

@media (max-width: 858px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.6rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero h2 {
        font-size: 1.2rem;
    }
    
    .hamburger {
        display: block;
        z-index: 1001;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: white;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: right 0.3s ease;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        z-index: 1000;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links li {
        margin: var(--spacing-md) 0;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }
    
    body.menu-open {
        overflow: hidden;
    }
    
    .speakers-grid {
        grid-template-columns: 1fr;
    }
}

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

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

.fade-in-delay-1 {
    animation-delay: 0.2s;
}

.fade-in-delay-2 {
    animation-delay: 0.4s;
}

.fade-in-delay-3 {
    animation-delay: 0.6s;
}