/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: white;
        flex-direction: column;
        justify-content: center;
        transition: right 0.3s;
        z-index: 1001;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-toggle {
        display: block;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .steps {
        grid-template-columns: 1fr;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .dashboard-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: static;
    }

    .main-content {
        margin-left: 0;
    }

    .dashboard-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }

    .dashboard-stats {
        grid-template-columns: 1fr;
    }

    .dashboard-content {
        grid-template-columns: 1fr;
    }

    .upload-container {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .filters {
        grid-template-columns: 1fr;
    }

    .results-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }

    .papers-grid {
        grid-template-columns: 1fr;
    }

    .profile-container {
        grid-template-columns: 1fr;
    }

    .overview-grid {
        grid-template-columns: 1fr;
    }

    .reports-grid {
        grid-template-columns: 1fr;
    }

    .credit-packages {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero {
        padding: 6rem 1rem 2rem;
    }

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

    .hero-content p {
        font-size: 1rem;
    }

    .btn-large {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }

    .features,
    .how-it-works,
    .pricing {
        padding: 3rem 0;
    }

    .features h2,
    .how-it-works h2,
    .pricing h2 {
        font-size: 2rem;
    }

    .feature-card,
    .step,
    .pricing-card {
        padding: 1.5rem;
    }

    .main-content {
        padding: 1rem;
    }

    .sidebar-menu a {
        padding: 1rem;
    }

    .upload-form-container,
    .profile-sidebar,
    .profile-content {
        padding: 1rem;
    }

    .modal-content {
        margin: 10% auto;
        padding: 1.5rem;
    }
}
/* Additional responsive fixes */
@media (max-width: 576px) {
    .welcome-heading {
        font-size: 1.25rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .dashboard-content {
        padding: 0.5rem;
    }
}

@media (min-width: 1440px) {
    .dashboard-content {
        max-width: 1600px;
    }

    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {

    .btn,
    .file-action,
    .chat-toggle,
    .send-btn {
        min-height: 44px;
        min-width: 44px;
        padding: 0.75rem;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        min-height: 44px;
        font-size: 16px;
        /* Prevents zoom on iOS */
    }
}