@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-surface);
        flex-direction: column;
        padding: var(--space-4);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.open {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .navbar-container {
        position: relative;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .tabs-navigation {
        flex-wrap: nowrap;
    }

    .tab-btn {
        padding: var(--space-3) var(--space-4);
        font-size: 0.875rem;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }

    .invoice-header {
        flex-direction: column;
        gap: var(--space-4);
    }

    .plan-card {
        padding: var(--space-6);
    }

    .container {
        padding: var(--space-4);
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .auth-card {
        padding: var(--space-4);
        margin: var(--space-4);
    }

    .stat-value {
        font-size: 2rem;
    }

    .hero {
        padding: var(--space-8) 0;
    }
}