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

        body {
            font-family: 'Optima', 'Palatino', 'Avenir', 'Helvetica', sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #8B1538 0%, #2E5233 100%);
            min-height: 100vh;
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
            padding: 20px;
        }

        .header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 25px;
            margin-bottom: 20px;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
            text-align: center;
        }

        .header h1 {
            font-size: 2.5rem;
            background: linear-gradient(135deg, #8B1538, #2E5233);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 8px;
            font-weight: 700;
        }

        .header p {
            font-size: 1.1rem;
            color: #666;
            margin-bottom: 15px;
        }

        .nav {
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .nav a {
            color: #8B1538;
            text-decoration: none;
            font-weight: 600;
            padding: 8px 16px;
            border-radius: 20px;
            transition: all 0.3s ease;
        }

        .nav a:hover, .nav a.active {
            background: linear-gradient(135deg, #8B1538, #2E5233);
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
        }

        .section {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 25px;
            margin-bottom: 20px;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }

        .section h2 {
            font-size: 2rem;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #8B1538, #2E5233);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 700;
        }

        .seminar-item {
            background: linear-gradient(135deg, #f8f9ff, #f0f4f1);
            border-radius: 12px;
            padding: 20px;
            margin-bottom: 20px;
            border-left: 4px solid #8B1538;
            transition: all 0.3s ease;
        }

        .seminar-item:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
        }

        .seminar-header {
            display: grid;
            grid-template-columns: 1fr auto;
            gap: 20px;
            align-items: start;
            margin-bottom: 15px;
        }

        .seminar-info h3 {
            font-size: 1.3rem;
            font-weight: 600;
            color: #333;
            margin-bottom: 5px;
            line-height: 1.3;
        }

        .seminar-speaker {
            font-size: 1.1rem;
            color: #8B1538;
            font-weight: 500;
            margin-bottom: 5px;
        }

        .seminar-affiliation {
            font-size: 0.95rem;
            color: #666;
            margin-bottom: 8px;
        }

        .seminar-datetime {
            font-size: 0.9rem;
            color: #2E5233;
            font-weight: 500;
        }

        .poster-link {
            width: 80px;
            height: 100px;
            border-radius: 8px;
            background: linear-gradient(135deg, #8B1538, #2E5233);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 2rem;
            text-decoration: none;
            transition: all 0.3s ease;
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
        }

        .poster-link:hover {
            transform: scale(1.05);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
        }

        .poster-link img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 8px;
        }

.collapsible-buttons {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.share-btn {
    background: linear-gradient(135deg, #0A6836, #2E5233);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.share-btn:hover {
    background: linear-gradient(135deg, #2E5233, #0A6836);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.share-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #0A6836, #2E5233);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 1000;
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.3s ease;
}

.share-notification.show {
    opacity: 1;
    transform: translateX(0);
}

        .collapsible-btn {
            background: linear-gradient(135deg, #8B1538, #2E5233);
            color: white;
            border: none;
            padding: 8px 16px;
            border-radius: 20px;
            cursor: pointer;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .collapsible-btn:hover {
            background: linear-gradient(135deg, #2E5233, #8B1538);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
        }

        .collapsible-btn.active {
            background: linear-gradient(135deg, #0A6836, #2E5233);
        }

        .collapsible-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            margin-top: 10px;
        }

        .collapsible-content.active {
            max-height: 500px;
        }

        .collapsible-inner {
            background: rgba(255, 255, 255, 0.8);
            border-radius: 8px;
            padding: 15px;
            margin-top: 10px;
            border: 1px solid rgba(139, 21, 56, 0.1);
        }

        .collapsible-inner h4 {
            color: #8B1538;
            margin-bottom: 10px;
            font-size: 1rem;
        }

        .collapsible-inner p {
            color: #555;
            font-size: 0.95rem;
            line-height: 1.5;
        }

        .upcoming-badge {
            background: linear-gradient(135deg, #F5D800, #FF6B35);
            color: white;
            padding: 4px 12px;
            border-radius: 15px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-left: 10px;
        }

        .past-item {
            opacity: 0.8;
        }

        .past-item .seminar-item {
            background: linear-gradient(135deg, #f5f5f5, #f0f0f0);
            border-left-color: #999;
        }

        .footer {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 20px;
            text-align: center;
            margin-top: 20px;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }

        .footer p {
            color: #666;
            font-size: 0.9rem;
        }

        .footer a {
            color: #0A6836;
            text-decoration: none;
        }

        .footer a:hover {
            color: #8B1538;
        }

        @media (max-width: 768px) {
            .header h1 {
                font-size: 2rem;
            }
            
            .nav {
                gap: 4px;
            }

            .nav a {
                padding: 6px 12px;
            }
            
            .section {
                padding: 20px;
            }
            
            .seminar-header {
                grid-template-columns: 1fr;
                gap: 15px;
            }
            
            .poster-link {
                width: 100%;
                height: 120px;
            }
            
            .collapsible-buttons {
                flex-wrap: wrap;
            }
        }