.lesson-a4-pages {
    display: grid;
    justify-items: center;
    gap: 24px;
    min-width: 0;
}

.lesson-a4-page {
    position: relative;
    box-sizing: border-box;
    width: min(100%, 210mm);
    min-height: 297mm;
    padding: 16mm;
    background: #fff;
    color: #1e293b;
    box-shadow: 0 12px 30px rgba(15, 23, 42, .12);
    overflow-wrap: anywhere;
}

.lesson-a4-page .ql-editor {
    padding: 0;
    min-height: 0;
    font-family: Helvetica, Arial, sans-serif;
    font-size: 13px;
    line-height: 1.42;
    color: inherit;
    overflow: visible;
    white-space: pre-wrap;
    overflow-wrap: break-word;
}

.lesson-a4-page .ql-editor p,
.lesson-a4-page .ql-editor h1,
.lesson-a4-page .ql-editor h2,
.lesson-a4-page .ql-editor h3,
.lesson-a4-page .ql-editor blockquote,
.lesson-a4-page .ql-editor pre {
    margin: 0;
}

.lesson-a4-page .ql-editor .ql-align-center { text-align: center; }
.lesson-a4-page .ql-editor .ql-align-right { text-align: right; }
.lesson-a4-page .ql-editor .ql-align-justify { text-align: justify; }

.lesson-a4-page .ql-editor img {
    max-width: 100%;
    max-height: 250mm;
    height: auto;
    object-fit: contain;
}

.lesson-a4-page .ql-editor img.ql-image-align-left,
.lesson-a4-page .ql-editor img.ql-image-align-center,
.lesson-a4-page .ql-editor img.ql-image-align-right { display: block; }
.lesson-a4-page .ql-editor img.ql-image-align-left { margin-left: 0; margin-right: auto; }
.lesson-a4-page .ql-editor img.ql-image-align-center { margin-left: auto; margin-right: auto; }
.lesson-a4-page .ql-editor img.ql-image-align-right { margin-left: auto; margin-right: 0; }

.lesson-a4-page .ql-size-10px { font-size: 10px; }
.lesson-a4-page .ql-size-12px { font-size: 12px; }
.lesson-a4-page .ql-size-14px { font-size: 14px; }
.lesson-a4-page .ql-size-16px { font-size: 16px; }
.lesson-a4-page .ql-size-18px { font-size: 18px; }
.lesson-a4-page .ql-size-20px { font-size: 20px; }
.lesson-a4-page .ql-size-24px { font-size: 24px; }
.lesson-a4-page .ql-size-28px { font-size: 28px; }
.lesson-a4-page .ql-size-32px { font-size: 32px; }
.lesson-a4-page .ql-size-36px { font-size: 36px; }
.lesson-a4-page .ql-size-48px { font-size: 48px; }
.lesson-a4-page .ql-font-inter { font-family: Inter, Arial, sans-serif; }
.lesson-a4-page .ql-font-arial { font-family: Arial, sans-serif; }
.lesson-a4-page .ql-font-serif { font-family: Georgia, serif; }
.lesson-a4-page .ql-font-monospace { font-family: monospace; }
.lesson-a4-page .ql-font-roboto { font-family: Roboto, Arial, sans-serif; }
.lesson-a4-page .ql-font-nunito { font-family: Nunito, Arial, sans-serif; }
.lesson-a4-page .ql-font-arial-black { font-family: 'Arial Black', Arial, sans-serif; font-weight: 900; }
.lesson-a4-page .ql-font-georgia { font-family: Georgia, serif; }
.lesson-a4-page .ql-font-times-new-roman { font-family: 'Times New Roman', serif; }
.lesson-a4-page .ql-font-comic-sans { font-family: 'Comic Sans MS', cursive; }
.lesson-a4-page .ql-font-courier-new { font-family: 'Courier New', monospace; }

.lesson-a4-exercises { height: auto; }
.lesson-a4-exercise { break-inside: avoid; page-break-inside: avoid; margin-top: 8mm; }

.lesson-a4-page-number {
    position: absolute;
    right: 16mm;
    bottom: 6mm;
    margin: 0;
    color: #94a3b8;
    font: 10px Arial, sans-serif;
}

@media print {
    @page { size: A4; margin: 0; }
    html, body { margin: 0; padding: 0; background: white; }
    .lesson-a4-pages { display: block; }
    .lesson-a4-page:not(.lesson-a4-exercises) {
        width: 210mm;
        height: 297mm;
        min-height: 0;
        margin: 0;
        box-shadow: none;
        break-after: page;
        page-break-after: always;
    }
    .lesson-a4-exercises {
        width: 210mm;
        min-height: 297mm;
        box-shadow: none;
        margin: 0;
    }
    .lesson-a4-page:last-child { break-after: auto; page-break-after: auto; }
}