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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

/* Navigation */
.navbar {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

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

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #3498db;
}

/* Hero Section */
.hero {
    background-image: url('pictures/cover.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: white;
    padding: 5rem 0;
    text-align: center;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1;
}

.hero .container {
    position: relative;
    z-index: 2;
}

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

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s;
    font-weight: 500;
}

.btn-primary {
    background-color: white;
    color: #667eea;
}

.btn-primary:hover {
    background-color: #f0f0f0;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: #3498db;
    color: white;
}

.btn-secondary:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

/* Content Sections */
.content {
    padding: 4rem 0;
}

.bg-light {
    background-color: #f8f9fa;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

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

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

/* Cards */
.card {
    background: 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 h4 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

/* Event Cards */
.event-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.event-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.event-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

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

.event-badge {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-upcoming {
    background-color: #27ae60;
    color: white;
}

.badge-past {
    background-color: #95a5a6;
    color: white;
}

.event-date {
    color: #7f8c8d;
    font-size: 1rem;
    margin-bottom: 1rem;
}

.event-description {
    color: #555;
    margin-bottom: 1rem;
}

/* Event Detail Page */
.event-detail-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 0;
}

.event-detail-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.event-info {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.event-info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.schedule-item {
    background: white;
    padding: 1.5rem;
    border-left: 4px solid #3498db;
    margin-bottom: 1rem;
    border-radius: 4px;
}

.schedule-time {
    font-weight: 600;
    color: #3498db;
    margin-bottom: 0.5rem;
}

.schedule-title {
    font-size: 1.2rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.schedule-speaker {
    color: #7f8c8d;
    font-style: italic;
}

/* Registration Box */
.registration-box {
    background: #ecf0f1;
    padding: 2rem;
    border-radius: 8px;
    margin-top: 2rem;
}

.registration-box h4 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

/* News Items */
.news-item {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.news-item h4 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.date {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Footer */
footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

/* Program Tabs */
.program-tabs {
    display: flex;
    gap: 0.5rem;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.tab-button {
    background-color: #ecf0f1;
    color: #2c3e50;
    border: 2px solid transparent;
    padding: 0.8rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s;
}

.tab-button:hover {
    background-color: #d5dbdb;
}

.tab-button.active {
    background-color: #3498db;
    color: white;
    border-color: #3498db;
}

.program-day {
    display: none;
}

.program-day.active {
    display: block;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        gap: 1rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .event-header {
        flex-direction: column;
    }

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

    .program-tabs {
        flex-direction: column;
    }

    .tab-button {
        width: 100%;
    }
}