/* صفحة الأبحاث العلمية */
.research-header {
    background: var(--primary-gradient);
    color: white;
    padding: 40px;
    border-radius: var(--radius-lg);
    text-align: center;
    margin-bottom: 30px;
    box-shadow: var(--shadow-md);
}

.filter-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    overflow-x: auto;
    padding-bottom: 5px;
    justify-content: center;
}

.filter-chip {
    background: var(--card-bg);
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    white-space: nowrap;
    border: 1px solid var(--border-light);
    transition: 0.3s;
    color: var(--text-muted);
}

.filter-chip.active {
    background: var(--primary-dark);
    color: white;
    border-color: var(--primary-dark);
}

.research-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    border-right: 6px solid var(--primary-dark);
    transition: 0.3s;
}

.research-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.res-category {
    color: var(--primary-dark);
    font-size: 0.75rem;
    font-weight: bold;
    text-transform: uppercase;
}

.res-title {
    font-size: 1.1rem;
    font-weight: bold;
    margin: 8px 0;
    color: var(--text-main);
}

.res-author {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 5px;
}

.res-abstract {
    font-size: 0.9rem;
    color: var(--text-soft);
    margin: 12px 0;
    line-height: 1.6;
}

.res-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-light);
    padding-top: 15px;
    margin-top: 10px;
}

.btn-download {
    background: var(--primary-soft);
    color: var(--primary-dark);
    padding: 8px 15px;
    border-radius: 10px;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: bold;
    transition: var(--transition);
}

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

.res-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}