/* Responsive Design */

/* Tablet Styles */
@media (max-width: 768px) {
    .main-header .container {
        flex-wrap: wrap;
    }
    
    .main-nav {
        width: 100%;
        order: 3;
        display: none;
    }
    
    .main-nav.active {
        display: block;
        margin-top: 1rem;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    .main-nav a {
        display: block;
        padding: 1rem;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .search-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .search-input,
    .search-btn {
        width: 100%;
    }
    
    .steps {
        grid-template-columns: 1fr;
    }
    
    .category-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
    
    .features {
        grid-template-columns: 1fr;
    }
}

/* Mobile Styles */
@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero h2 {
        font-size: 1.8rem;
    }
    
    .how-it-works h3,
    .categories h3,
    .about h3 {
        font-size: 2rem;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
    
    .step,
    .category-card,
    .feature {
        padding: 1.5rem;
    }
    
    .card-list {
        grid-template-columns: 1fr;
    }
    
    .grade-data {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Large Screen Styles */
@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
    }
    
    .hero h2 {
        font-size: 3.5rem;
    }
    
    .category-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}