@media (max-width: 1024px) {
    :root {
        --sidebar-width: 200px;
    }
    .main-content {
        margin-left: var(--sidebar-width);
    }
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 60px;
    }
    .main-content {
        margin-left: var(--sidebar-width);
        padding: 1.2rem;
    }
    .sudoku-table td {
        width: 38px;
        height: 38px;
        font-size: 1.1rem;
    }
    .sudoku-table td input {
        font-size: 1.1rem;
    }
    .difficulty-selector {
        flex-direction: column;
        align-items: flex-start;
    }
    .action-buttons {
        flex-direction: column;
    }
    .card-grid {
        grid-template-columns: 1fr;
    }
    .creator-card {
        margin: 1rem;
        padding: 1.5rem;
    }
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.3rem; }
}

@media (max-width: 480px) {
    .main-content {
        padding: 0.8rem;
    }
    .sudoku-table td {
        width: 30px;
        height: 30px;
        font-size: 0.9rem;
    }
    .sudoku-table td input {
        font-size: 0.9rem;
    }
    .btn-primary,
    .btn-secondary {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}