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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #fff;
}

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

/* Navigation */
.navbar {
    background: #1a1a1a;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: #fff;
    font-size: 1.2rem;
    font-weight: 600;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    color: #fff;
    text-decoration: none;
    transition: opacity 0.3s;
    font-size: 0.95rem;
}

.nav-menu a:hover {
    opacity: 0.7;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%)
    color: white;
    padding: 6rem 0;
    text-align: center;
}

.main-title {
    font-size: 4rem;
    color: #FFD700; /* Gold */
    text-shadow: 3px 3px 8px rgba(0, 0, 0, 0.9);
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.subtitle {
    font-size: 2rem;
    color: #FFD700; /* Gold */
    font-weight: 400;
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.9);
    margin-bottom: 2rem;
    line-height: 1.4;
}

.conference-link h3 {
    font-size: 2rem;
    color: #FFD700; /* Gold */
    font-weight: 400;
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.9);
    margin-bottom: 3rem;
}

.conference-link h3 {
    font-size: 2rem;
    color: #FFD700; /* Gold */
    font-weight: 400;
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.9);
}

.event-details h3 {
    font-size: 2rem;
    color: #FFD700; /* Gold */
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.9);
    margin-bottom: 1.5rem;
}

.btn-primary {
    display: inline-block;
    background: white;
    color: #667eea;
    padding: 1rem 2.5rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* Speaker Highlight Section */
.speaker-highlight {
    padding: 5rem 0;
    background: #f8f9fa;
}

.speaker-content {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.speaker-image {
    flex: 1;
}

.speaker-image img {
    width: 100%;
    max-width: 500px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.speaker-text {
    flex: 1;
}

.speaker-text h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.speaker-text h3 {
    font-size: 2.5rem;
    color: #667eea;
    margin-bottom: 2rem;
}

.btn-secondary {
    display: inline-block;
    background: #667eea;
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: background 0.3s;
}

.btn-secondary:hover {
    background: #764ba2;
}

/* Main Content Section */
.main-content {
    padding: 5rem 0;
}

.content-block {
    margin-bottom: 4rem;
}

.content-block h2 {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.5;
    color: #2c3e50;
    text-align: left;
}

/* Footer */
footer {
    background: #1a1a1a;
    color: white;
    text-align: center;
    padding: 3rem 0;
    margin-top: 5rem;
}

footer p {
    margin-bottom: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 1rem;
    }
    
    .main-title {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1.5rem;
    }
    
    .speaker-content {
        flex-direction: column;
        gap: 2rem;
    }
    
    .content-block h2 {
        font-size: 1.8rem;
    }
}

/* Page Content Styles */
.page-content {
    padding: 5rem 0;
    min-height: 60vh;
}

.page-content h1 {
    font-size: 3rem;
    color: #2c3e50;
    margin-bottom: 2rem;
    border-bottom: 3px solid #667eea;
    padding-bottom: 1rem;
}

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

.text-content h2 {
    font-size: 2rem;
    color: #667eea;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.text-content p {
    margin-bottom: 1.5rem;
}

.text-content ul {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

.text-content li {
    margin-bottom: 0.5rem;
}

/* Schedule Styles */
.schedule {
    margin-top: 3rem;
}

.schedule h2 {
    font-size: 2rem;
    color: #667eea;
    margin-bottom: 2rem;
}

.schedule-item {
    display: flex;
    padding: 1.5rem;
    border-bottom: 1px solid #ddd;
    align-items: center;
}

.schedule-item .time {
    font-weight: bold;
    color: #667eea;
    min-width: 150px;
    font-size: 1.1rem;
}

.schedule-item .activity {
    font-size: 1.1rem;
}

/* Organizers List */
.organizers-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.organizer {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.organizer h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.organizer p {
    margin-bottom: 0.5rem;
    color: #666;
}

.hero {
  width: 100%;
  min-height: 70vh;
  background-image: url("images/OpenClusters.png");
    /* background-image: 
    linear-gradient(rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.1)),
    url("images/OpenClusters.png"); */
  background-size: cover;        /* fit width, keep aspect */
  background-position: center;   /* center image */
  background-repeat: no-repeat;

  display: flex;
  align-items: center;

  position: relative;
}