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

:root {
    --primary-color: #2c5f6f;
    --secondary-color: #c87533;
    --accent-color: #6b4c7a;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --gray: #6c757d;
    --border-color: #dee2e6;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

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

/* Navigation */
.navbar {
    background-color: var(--primary-color);
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.nav-brand a {
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 1.8rem;
    font-weight: 600;
    font-family: 'Avenir', 'Avenir Next', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: 0.05em;
}

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

.nav-menu a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--secondary-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 6rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
    font-weight: 500;
}

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

.btn-primary:hover {
    background-color: var(--light-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

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

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

/* Features Section */
.features {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

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

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

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.member-logo {
    display: block;
    max-width: 240px;
    height: auto;
    margin-bottom: 1.5rem;
}

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

.content-section h1 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 2.5rem;
}

.content-section h2 {
    color: var(--primary-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 2rem;
}

.content-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

/* Event Card */
.event-card {
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: box-shadow 0.3s ease;
}

.event-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.event-date {
    display: inline-block;
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 5px;
    font-weight: bold;
    margin-bottom: 1rem;
}

.event-type {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 3px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-left: 0.5rem;
}

.event-type.online {
    background-color: #e3f2fd;
    color: #1976d2;
}

.event-type.in-person {
    background-color: #f3e5f5;
    color: #7b1fa2;
}

.event-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.event-details {
    color: var(--gray);
    margin-bottom: 0.75rem;
}

/* Publication Card */
.publication-card {
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: box-shadow 0.3s ease;
}

.publication-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

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

.publication-authors {
    font-style: italic;
    color: var(--gray);
    margin-bottom: 0.5rem;
}

.publication-meta {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

/* CTA Section */
.cta {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.cta h2 {
    margin-bottom: 1rem;
    font-size: 2rem;
}

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

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
}

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

    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .hero h1 {
        font-size: 2rem;
    }

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

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