* {
    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: #333;
}

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

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

.logo h1 {
    font-size: 1.5rem;
    color: #c41230;
    font-weight: 700;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Navigation */
.main-nav {
    background: #f8f9fa;
    border-bottom: 1px solid #e0e0e0;
}

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

.main-nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 1rem 0;
    display: block;
    transition: color 0.3s;
}

.main-nav a:hover {
    color: #c41230;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #1e3a5f 0%, #2d5a7b 50%, #3d7a9c 100%);
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 2rem;
    color: white;
}

.hero-content {
    max-width: 900px;
}

.conference-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.logo-icon svg {
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.3));
}

.conference-details h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.conference-details .location,
.conference-details .dates {
    font-size: 1rem;
    letter-spacing: 2px;
    opacity: 0.9;
}

.workshop-badge {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: white;
    padding: 0.75rem 2rem;
    border-radius: 30px;
    font-size: 1rem;
    cursor: pointer;
    margin-bottom: 2rem;
    transition: all 0.3s;
}

.workshop-badge:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: white;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    opacity: 0.95;
    max-width: 800px;
    margin: 0 auto;
}

/* Content Sections */
.content-section {
    padding: 4rem 2rem;
}

.alt-bg {
    background: #f8f9fa;
}

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

.section-title {
    font-size: 2.5rem;
    color: #1e3a5f;
    margin-bottom: 2rem;
    text-align: center;
    font-weight: 700;
}

.section-content {
    max-width: 900px;
    margin: 0 auto;
}

.section-content p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: #555;
}

.section-content h3 {
    font-size: 1.8rem;
    color: #1e3a5f;
    margin: 2rem 0 1rem;
}

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

.section-content ul li {
    margin-bottom: 0.75rem;
    color: #555;
    font-size: 1.1rem;
}

.topics-list {
    list-style-type: none;
    margin-left: 0 !important;
}

.topics-list li {
    padding-left: 1.5rem;
    position: relative;
}

.topics-list li:before {
    content: "•";
    color: #c41230;
    font-weight: bold;
    font-size: 1.5rem;
    position: absolute;
    left: 0;
}

/* Speakers Grid */
.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

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

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

.speaker-image-placeholder {
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, #3d7a9c, #2d5a7b);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
}

.speaker-card h3 {
    font-size: 1.3rem;
    color: #1e3a5f;
    margin-bottom: 0.5rem;
}

.speaker-card .affiliation {
    color: #666;
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
}

.speaker-card .bio {
    color: #777;
    font-size: 0.9rem;
    font-style: italic;
    margin-bottom: 1rem;
}

.speaker-card .status {
    font-weight: 600;
    font-size: 0.9rem;
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    display: inline-block;
}

.speaker-card .status.confirmed {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.speaker-card .status.tentative {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

/* Schedule */
.schedule-note {
    text-align: center;
    font-style: italic;
    color: #666;
    margin-bottom: 2rem;
}

.schedule-table {
    max-width: 800px;
    margin: 0 auto;
}

.schedule-item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 2rem;
    padding: 1.25rem;
    background: white;
    margin-bottom: 0.5rem;
    border-radius: 8px;
    border-left: 4px solid #3d7a9c;
    transition: all 0.3s;
}

.schedule-item:hover {
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transform: translateX(5px);
}

.schedule-item .time {
    font-weight: 600;
    color: #1e3a5f;
}

.schedule-item .event {
    color: #555;
}

.interaction-highlights {
    margin-top: 3rem;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    border-left: 4px solid #c41230;
}

.interaction-highlights h3 {
    color: #1e3a5f;
    margin-bottom: 1rem;
}

.interaction-highlights ul {
    list-style-type: none;
    margin-left: 0;
}

.interaction-highlights li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: #555;
}

.interaction-highlights li:before {
    content: "▶";
    color: #c41230;
    position: absolute;
    left: 0;
    font-size: 0.8rem;
}

/* Submission Link */
.submission-link-container {
    background: #e8f4f8;
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #3d7a9c;
    margin: 2rem 0;
    text-align: center;
}

.submission-link-container strong {
    color: #1e3a5f;
    font-size: 1.1rem;
}

.submission-link {
    display: inline-block;
    margin-top: 1rem;
    padding: 1rem 2rem;
    background: #3d7a9c;
    color: white !important;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s;
    word-break: break-all;
}

.submission-link:hover {
    background: #2d5a7b;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(61, 122, 156, 0.3);
}

/* Dates List */
.dates-list {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    margin: 2rem 0;
}

.date-item {
    padding: 1rem 0;
    border-bottom: 1px solid #e0e0e0;
}

.date-item:last-child {
    border-bottom: none;
}

.date-item strong {
    color: #1e3a5f;
}

/* Competition Section */
.competition-details {
    margin-top: 2rem;
}

.competition-details h3 {
    color: #1e3a5f;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.competition-details a {
    color: #3d7a9c;
    text-decoration: none;
    font-weight: 600;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s;
}

.competition-details a:hover {
    border-bottom-color: #3d7a9c;
}

.competition-details ul {
    margin-left: 2rem;
}

.competition-details ul li {
    margin-bottom: 0.5rem;
}

/* Organizers Grid */
.organizers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

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

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

.organizer-card h3 {
    font-size: 1.3rem;
    color: #1e3a5f;
    margin-bottom: 0.75rem;
}

.organizer-card .affiliation {
    color: #666;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.organizer-card .email {
    color: #3d7a9c;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.organizer-card .bio {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.5;
    margin-top: 0.75rem;
}

/* Contact */
.contact-email {
    font-size: 1.2rem;
    color: #1e3a5f;
    margin: 2rem 0;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-link {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: #3d7a9c;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background 0.3s;
}

.social-link:hover {
    background: #2d5a7b;
}

/* Footer */
footer {
    background: #1e3a5f;
    color: white;
    text-align: center;
    padding: 2rem;
}

footer p {
    margin: 0.5rem 0;
    opacity: 0.9;
}

/* Responsive Design */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    
    .main-nav {
        display: none;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    .main-nav li {
        border-bottom: 1px solid #e0e0e0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .conference-logo {
        flex-direction: column;
        gap: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .schedule-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .speakers-grid,
    .organizers-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .header-content,
    .main-nav ul {
        padding: 0 1rem;
    }
    
    .content-section {
        padding: 2rem 1rem;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
}