/* Base styles and CSS variables */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --border-color: #dee2e6;
    --link-color: #2980b9;
    --link-hover: #1a5490;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    font-size: 16px;
}

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

/* Header styles */
.site-header {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem 0 0 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-content {
    text-align: center;
    padding-bottom: 1.5rem;
}

.site-title h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.site-title h1 a {
    color: white;
    text-decoration: none;
}

.site-title h1 a:hover {
    color: var(--secondary-color);
}

.subtitle {
    font-size: 1.2rem;
    color: #ecf0f1;
    margin-bottom: 0.5rem;
}

.seminar-dates {
    font-size: 1rem;
    color: #bdc3c7;
}

/* Navigation */
.site-nav {
    background-color: rgba(0, 0, 0, 0.1);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.site-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.site-nav li {
    margin: 0;
}

.site-nav a {
    display: block;
    padding: 1rem 1.5rem;
    color: white;
    text-decoration: none;
    transition: background-color 0.3s;
}

.site-nav a:hover,
.site-nav a.active {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Main content */
main {
    padding: 3rem 0;
    min-height: 60vh;
}

section {
    margin-bottom: 3rem;
}

h1, h2, h3, h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
    border-bottom: 3px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

h2 {
    font-size: 2rem;
    margin-top: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.2rem;
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* Key info boxes */
.key-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
    padding: 2rem;
    background-color: var(--light-bg);
    border-radius: 8px;
}

.info-item {
    text-align: center;
    padding: 1rem;
}

/* Organizer grid */
.organizer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.organizer-card {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
}

.organizer-card h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.organizer-card p {
    color: #555;
    margin-bottom: 0;
}

/* Organizer profiles (detailed page) */
.organizer-profile {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.organizer-profile:last-child {
    border-bottom: none;
}

.profile-header h2 {
    margin-bottom: 0.5rem;
}

.affiliation {
    color: #555;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

/* Focus areas */
.focus-area {
    background-color: var(--light-bg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

/* Keywords */
.keyword-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.keyword-list li {
    background-color: var(--secondary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

/* Schedule */
.day-schedule {
    background-color: var(--light-bg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 8px;
}

.day-schedule h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.day-schedule ul {
    margin-left: 1.5rem;
}

.day-schedule li {
    margin-bottom: 0.5rem;
}

/* Participant grid */
.participant-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.participant-card {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
}

.participant-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.participant-affiliation {
    color: #555;
    font-style: italic;
    margin-bottom: 0.5rem;
}

.participant-interests {
    font-size: 0.9rem;
    color: #666;
}

/* Footer */
.site-footer {
    background-color: var(--primary-color);
    color: white;
    padding: 3rem 0 1rem 0;
    margin-top: 4rem;
}

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

.footer-section h3 {
    color: white;
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.footer-section p,
.footer-section li {
    color: #bdc3c7;
    font-size: 0.9rem;
}

.organizer-list {
    list-style: none;
}

.organizer-list li {
    margin-bottom: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: #bdc3c7;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.footer-bottom a {
    color: var(--secondary-color);
}

/* Utility classes */
.page-header {
    margin-bottom: 2rem;
}

.more-link {
    text-align: center;
    margin-top: 1.5rem;
}

.more-link a {
    font-size: 1.1rem;
    color: var(--secondary-color);
    font-weight: 500;
}

/* Responsive design */
@media (max-width: 768px) {
    .site-title h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .seminar-dates {
        font-size: 0.9rem;
    }

    .site-nav ul {
        flex-direction: column;
    }

    .site-nav a {
        text-align: center;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

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

    .organizer-grid,
    .participant-grid {
        grid-template-columns: 1fr;
    }

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

/* Print styles */
@media print {
    .site-nav,
    .site-footer {
        display: none;
    }

    body {
        font-size: 12pt;
    }

    a {
        text-decoration: underline;
    }
}