.book-reading-guide { margin: 22px 0; padding: 14px; background: #f4f7fa; border-left: 3px solid #8e70a4; overflow-wrap: anywhere; }
.book-reading-guide h2 { margin-top: 0; }
.book-reading-guide dl { margin: 12px 0; }
.book-reading-guide dt { font-weight: bold; margin-top: 12px; }
.book-reading-guide dd { margin: 4px 0 12px; line-height: 1.7; }
.book-reading-guide p { font-size: 12px; line-height: 1.7; }
.book-reading-guide summary { cursor: pointer; padding: 7px 0; line-height: 1.6; }
.book-reading-guide summary:focus-visible { outline: 3px solid #9d77af; outline-offset: 3px; }
.book-reading-estimate { font-weight: bold; }
@media print { .book-reading-guide { background: transparent; border-color: #777; } .book-reading-guide details > * { display: block; } }