/* Desktop styles stay in their original files. These overrides apply only
   when the viewport is too narrow for the sidebar and side-by-side books. */
@media (max-width: 767px) {
    body {
        display: block;
        font-size: 16px;
        line-height: 1.55;
    }

    #left-column {
        box-sizing: border-box;
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 8px;
        width: 100%;
        height: auto;
        padding: 12px;
    }

    #left-column button {
        min-height: 44px;
        margin: 0;
        padding: 10px 6px;
        font-size: 1rem;
        overflow-wrap: anywhere;
    }

    #right-column {
        min-width: 0;
        padding: 16px;
        overflow-wrap: anywhere;
    }

    #content h1 {
        font-size: 1.75rem;
        line-height: 1.2;
    }

    #content h3 {
        font-size: 1.1rem;
        line-height: 1.4;
    }

    #content img {
        max-width: 100%;
        height: auto;
        box-sizing: border-box;
    }

    #content .flexible-width {
        min-width: 0;
    }

    #content .book-list,
    #content .book-list tbody,
    #content .book-list tr,
    #content .book-list td {
        display: block;
        width: auto;
    }

    #content .book-list tr {
        padding: 20px 0;
    }

    #content .book-list tr + tr {
        border-top: 1px solid #ddd;
    }

    #content .book-list td {
        padding: 0;
    }

    #content .book-list img {
        max-width: 160px;
        width: 100%;
        aspect-ratio: auto var(--cover-ratio);
    }

    #content .voyager-controls {
        align-items: stretch;
    }

    #content .voyager-controls label {
        flex-basis: 100%;
    }

    #content .voyager-controls input,
    #content .voyager-controls button {
        box-sizing: border-box;
        min-width: 0;
        max-width: 100%;
        min-height: 44px;
        font-size: 1rem;
    }

    #content .voyager-controls input {
        flex: 1 1 100%;
    }

    #content .voyager-controls button {
        flex: 1 1 0;
    }

    #content .voyager-output {
        padding: 12px;
        white-space: pre-wrap;
        overflow-wrap: anywhere;
        font-size: 0.875rem;
    }
}

@media (max-width: 379px) {
    #left-column {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}