@media (max-width: 560px) {
    .app {
        margin: 14px auto;
        padding: 0 8px;
    }

    .app-header {
        gap: 10px;
        margin-bottom: 12px;
    }

    .app-logo {
        width: 44px;
        height: 44px;
    }

    h1 {
        font-size: 30px;
    }

    .app-title p {
        margin-top: 2px;
        font-size: 13px;
    }

    .panel {
        padding: 10px 8px 12px;
        border-radius: 12px;
    }

    .app-footer {
        margin-top: 10px;
        font-size: 11px;
    }

    .help-button {
        top: 10px;
        right: 10px;
        width: 32px;
        height: 32px;
        font-size: 15px;
    }

    .game-area {
        width: 100%;
    }

    #puzzle {
        width: 100%;
    }

    .puzzle-controls {
        width: 100%;
    }

    .puzzle-controls {
        margin-bottom: 10px;
        padding-bottom: 12px;
    }

    .generation-header {
        padding-right: 42px;
    }

    .generation-header h2 {
        font-size: 18px;
    }

    .generation-header p {
        display: none;
    }

    .preset-buttons {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 5px;
        margin-top: 10px;
    }

    .preset-button {
        min-height: 42px;
        padding: 6px 4px;
        font-size: 13px;
    }

    .preset-button span {
        font-size: 11px;
    }

    .advanced-toggle {
        margin-top: 8px;
        padding: 8px 12px;
    }

    .advanced-settings {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 8px;
        align-items: end;
        margin-top: 10px;
        padding-top: 10px;
    }

    .advanced-settings button {
        grid-column: 1 / -1;
        width: 100%;
    }

    .size-control {
        min-width: 0;
        gap: 4px;
    }

    .size-control select {
        width: 100%;
        padding: 8px 6px;
    }

    .puzzle-grid {
        --grid-gap: 3px;
        width: min(100%, var(--grid-width));
        grid-template-columns: repeat(var(--grid-columns), minmax(0, 1fr)) !important;
        margin-bottom: 12px;
    }

    .cell,
    .clue,
    .corner {
        width: 100%;
        height: auto;
        min-width: 0;
        aspect-ratio: 1;
        border-radius: 6px;
        font-size: 18px;
        padding: 0;
    }

    .mark-mode {
        gap: 10px;
        margin-bottom: 14px;
    }

    .mode-switch {
        padding: 3px;
    }

    .mode-button {
        min-width: 76px;
        height: 30px;
        gap: 5px;
        padding: 0 8px;
    }

    .reset-button {
        width: 30px;
        height: 30px;
        font-size: 17px;
    }

    .result-panel {
        padding: 12px;
    }

    .modal-backdrop {
        align-items: start;
        padding: 12px 8px;
        overflow-y: auto;
    }

    .modal {
        padding: 18px;
        border-radius: 12px;
    }

    .help-modal {
        max-width: 100%;
    }

    .help-list {
        margin-top: 12px;
        line-height: 1.4;
    }

    .help-list li + li {
        margin-top: 6px;
    }

    .help-examples {
        gap: 8px;
        margin-top: 14px;
    }
}