/* Responsive Styles */
@media (max-width: 992px) {
    .browse-grid {
        grid-template-columns: 1fr;
    }
    
    .filters-sidebar {
        position: static;
        margin-bottom: 30px;
    }
}

@media (max-width: 768px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .papers-grid, .paper-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .upload-item, .favorite-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .upload-actions, .favorite-actions {
        margin-top: 15px;
        width: 100%;
        justify-content: flex-end;
    }
    
    nav ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    }
    
    nav ul.show {
        display: flex;
    }
    
    nav ul li {
        margin: 10px 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .user-menu .dropdown {
        position: static;
        box-shadow: none;
        display: none;
        padding: 0;
    }
    
    .user-menu:hover .dropdown {
        display: none;
    }
    
    .user-menu.show .dropdown {
        display: block;
    }
}

@media (max-width: 576px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .papers-grid, .paper-cards {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions .btn {
        width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}