:root {
    --navy-blue: #000080;
    --white: #FFFFFF;
    --light-gray: #F5F5F5;
    --medium-gray: #E0E0E0;
    --text-gray: #333333;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-gray);
}
 
/* Header Styles */
header {
    background: var(--navy-blue);
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    font-size: 2rem;
    font-weight: bold;
}

.logo-text h1 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.tagline {
    font-size: 0.9rem;
    font-style: italic;
    opacity: 0.9;
}

nav {
    background: var(--white);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

nav ul {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
}

nav ul li a {
    display: block;
    padding: 1rem 0;
    color: var(--navy-blue);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    color: #0000CD;
    border-bottom: 2px solid var(--navy-blue);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--navy-blue) 0%, #0000CD 100%);
    color: var(--white);
    padding: 4rem 2rem;
    text-align: center;
}

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

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 2rem;
}

.cta-button {
    display: inline-block;
    background: var(--white);
    color: var(--navy-blue);
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

/* Main Content */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.page-section {
    display: none;
}

.page-section.active {
    display: block;
}

.section-title {
    color: var(--navy-blue);
    font-size: 2rem;
    margin-bottom: 2rem;
    border-bottom: 3px solid var(--navy-blue);
    padding-bottom: 0.5rem;
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: 2rem;
    margin: 2rem 0;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.card {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

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

/* Conference Section */
.conference-highlight {
    background: linear-gradient(135deg, #f0f4ff 0%, #e6ecff 100%);
    padding: 3rem;
    border-radius: 10px;
    margin: 2rem 0;
    border-left: 5px solid var(--navy-blue);
}

.conference-highlight h3 {
    color: var(--navy-blue);
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

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

.detail-item {
    background: var(--white);
    padding: 1rem;
    border-radius: 5px;
}

.detail-item strong {
    color: var(--navy-blue);
    display: block;
    margin-bottom: 0.5rem;
}

/* Photo Gallery */
.photo-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.photo-item {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.photo-item img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform 0.3s;
}

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

/* Utility: shift image position inside its box (use class on specific images) */
.photo-item img.shift-down {
    object-position: center 30%;
}

.photo-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 128, 0.9);
    color: var(--white);
    padding: 1rem;
    font-weight: 500;
}

/* Video Section */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.video-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.video-card h4 {
    padding: 1rem;
    color: var(--navy-blue);
    font-size: 0.95rem;
}

/* Benefits Section */
.benefits-list {
    list-style: none;
    padding: 0;
}

.benefits-list li {
    padding: 1rem;
    margin: 0.5rem 0;
    background: var(--light-gray);
    border-left: 4px solid var(--navy-blue);
    border-radius: 4px;
}

.benefits-list li strong {
    color: var(--navy-blue);
    display: block;
    margin-bottom: 0.5rem;
}

/* Team Section */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.team-member {
    text-align: center;
    padding: 2rem;
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.team-member h4 {
    color: var(--navy-blue);
    margin: 1rem 0 0.5rem;
}

.team-member .role {
    color: #666;
    font-style: italic;
}

/* Contact Section */
.contact-info {
    background: var(--light-gray);
    padding: 2rem;
    border-radius: 8px;
    margin: 2rem 0;
}

.contact-info p {
    margin: 0.5rem 0;
}

.contact-info strong {
    color: var(--navy-blue);
}

/* Footer */
footer {
    background: var(--navy-blue);
    color: var(--white);
    padding: 3rem 2rem 1rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
}

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

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

.footer-section a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.9;
    transition: opacity 0.3s;
}

.footer-section a:hover {
    opacity: 1;
    text-decoration: underline;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.2);
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        position: relative;  /* was sticky; now it scrolls away */
    }
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    nav ul li a {
        padding: 0.75rem 0;
    }
    
    .hero h2 {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
}

/* Latest Updates Section */
.updates-list {
    list-style: none;
    padding: 0;
}

.updates-list li {
    padding: 1.5rem;
    margin: 1rem 0;
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    border-left: 4px solid var(--navy-blue);
}

.update-date {
    color: #666;
    font-size: 0.9rem;
    font-style: italic;
}

/* Awards Section */
.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.award-card {
    background: var(--light-gray);
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    transition: background 0.3s;
}

.award-card:hover {
    background: #e6ecff;
}

.award-card h4 {
    color: var(--navy-blue);
    margin-bottom: 1rem;
}