* {
    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;
    background-color: #fafafa;
}

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

header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2c3e50;
}

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

.nav-links a {
    text-decoration: none;
    color: #555;
    transition: color 0.3s;
    font-weight: 500;
}

.nav-links a:hover {
    color: #667eea;
}

.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.hero-subtitle-2 {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-authors {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-affiliations {
    font-size: 0.95rem;
    margin-bottom: 2rem;
    opacity: 0.85;
}

.hero-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.hero-link {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    transition: background-color 0.3s;
    font-weight: 500;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.hero-link:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

.content-section {
    background-color: #fff;
    padding: 1.5rem 0;
    margin: 0.5rem 0;
}

.section-title {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid #667eea;
}

.abstract {
    background-color: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    margin: 1rem 0;
}

.abstract p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
    text-align: justify;
}

.video-container {
    position: relative;
    width: 100%;
    max-width: 900px;
    margin: 1rem auto;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.framework-section {
    margin: 2rem 0;
}

.framework-image {
    width: 100%;
    max-width: 1000px;
    margin: 2rem auto;
    display: block;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

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

.result-card {
    background-color: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.result-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.result-content {
    padding: 1.5rem;
}

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

.result-description {
    color: #666;
    line-height: 1.6;
}

.bibtex-section {
    background-color: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    margin: 1rem 0;
}

.bibtex-code {
    background-color: #2c3e50;
    color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    overflow-x: auto;
    white-space: pre;
}

.acknowledgement {
    background-color: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    margin: 1rem 0;
}

.acknowledgement p {
    color: #555;
    line-height: 1.8;
}

footer {
    background-color: #2c3e50;
    color: white;
    padding: 2rem 0;
    text-align: center;
    margin-top: 1.5rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-text {
    flex-grow: 1;
    text-align: left;
}

.footer-text p {
    font-size: 0.9rem;
    margin: 0.5rem 0;
    color: #cccccc;
}

.footer-text a {
    color: #ADD8E6;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-text a:hover {
    color: #E0FFFF;
    text-decoration: underline;
}

.footer-logos {
    display: flex;
    gap: 15px;
    align-items: center;
    background-color: #ffffff;
    padding: 8px 15px;
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
}

.footer-logo {
    height: 35px;
    width: auto;
    object-fit: contain;
}

.text-content {
    color: #555;
    line-height: 1.8;
    margin: 1rem 0;
}

.text-content p {
    margin-bottom: 1rem;
}

.text-content ul, .text-content ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.text-content li {
    margin-bottom: 0.5rem;
}

.example-section {
    margin-top: 1rem;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 8px;
}

.example-section h4 {
    color: #2c3e50;
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.example-story {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    margin-bottom: 1rem;
    font-style: italic;
    color: #444;
    line-height: 1.8;
}

.example-description {
    color: #666;
    font-size: 0.95rem;
    margin: 1rem 0;
}

.section-item {
    margin-bottom: 2rem;
}

.section-item h5 {
    color: #667eea;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.section-text {
    color: #555;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    padding: 1rem;
    background: white;
    border-radius: 6px;
    line-height: 1.6;
}

.example-images {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.example-image {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.example-image:hover {
    transform: scale(1.05);
}

.keywords-section {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.keywords-list {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.keyword-tag {
    background: #667eea;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 1.8rem;
    }

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

    .hero-subtitle-2 {
        font-size: 1rem;
    }

    .hero-links {
        flex-direction: column;
        align-items: center;
    }

    .hero-link {
        width: 200px;
        text-align: center;
    }

    .section-title {
        font-size: 1.5rem;
    }

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

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-text {
        text-align: center;
    }

    .example-images {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }

    .example-image {
        height: 120px;
    }
}