/* Publications Page Styles */
.publications-hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 120px 0 60px;
    text-align: center;
}

.publications-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

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

.publication-metrics {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-top: 2rem;
}

.metric {
    text-align: center;
}

.metric .number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.metric .label {
    font-size: 1rem;
    opacity: 0.9;
}

.publications-list {
    padding: 4rem 0;
    background: var(--light-gray);
}

.filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    border: none;
    background: var(--white);
    color: var(--text-color);
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn.active {
    background: var(--secondary-color);
    color: var(--white);
}

.publications-grid {
    display: grid;
    gap: 2rem;
}

.publication-item {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    padding: 2rem;
    transition: transform 0.3s ease;
}

.publication-item:hover {
    transform: translateY(-5px);
}

.pub-content h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.authors {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.journal {
    color: var(--text-color);
    font-style: italic;
    margin-bottom: 1rem;
}

.abstract {
    color: var(--text-color);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tag {
    background: var(--light-gray);
    color: var(--primary-color);
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.9rem;
}

.pub-links {
    display: flex;
    gap: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--secondary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 4px;
    transition: background 0.3s ease;
}

.btn:hover {
    background: var(--primary-color);
}

.btn.disabled {
    background: #cfd3d8;
    color: #555;
    cursor: default;
}

.btn.disabled:hover {
    background: #cfd3d8;
}

/* Animations */
.publication-item {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .publications-hero {
        padding: 100px 0 40px;
    }

    .publications-hero h1 {
        font-size: 2rem;
    }

    .publication-metrics {
        gap: 2rem;
    }

    .metric .number {
        font-size: 2rem;
    }

    .filters {
        flex-wrap: wrap;
    }

    .publication-item {
        padding: 1.5rem;
    }

    .pub-links {
        flex-wrap: wrap;
    }
}