:root {
    --primary-color: #4f46e5;
    --secondary-color: #8b5cf6;
    --neutral-bg: #f9fafb;
    --hero-gradient: linear-gradient(135deg, #dbeafe, #bfdbfe);
    --card-shadow: 0 10px 25px -5px rgba(0,0,0,0.1);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease-out forwards;
}

.hero-gradient {
    background: var(--hero-gradient);
    padding: 4rem 2rem;
    text-align: center;
}

.secondary-color {
    background-color: var(--secondary-color);
}

.hero-gradient h1 {
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    background-image: linear-gradient(90deg, #4f46e5, #6366f1, #8b5cf6);
}

.citation-block {
    background: var(--secondary-color);
    color: white;
    padding: 2rem;
    margin: 3rem auto;
    border-radius: 1.5rem;
    max-width: 600px;
    text-align: center;
}

.citation-block blockquote {
    background: rgba(0,0,0,0.1);
    padding: 1rem 2rem;
    border-radius: 1rem;
    margin: 1rem 0;
}

.related-articles {
    padding: 3rem 1rem;
    background: var(--neutral-bg);
}

.related-card {
    background: white;
    padding: 2rem;
    border-radius: 1.5rem;
    margin: 1rem 0;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease;
}

.related-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px -10px rgba(0,0,0,0.15);
}

.article-author {
    padding: 2rem 1rem;
}

.footer {
    background: #f3f4f6;
    padding: 2rem 1rem;
}

.footer a:hover {
    color: var(--primary-color);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .hero-gradient {
        padding: 3rem 1rem;
    }
    
    .related-card {
        margin: 0.5rem 0;
    }
}