/* 说明框填满工具栏剩余空间；长文字缓慢滚动，点击查看全文。 */
.textbook-page .reader-main { grid-template-rows: auto auto minmax(0,1fr); }
.textbook-page .reader-workspace { grid-row: 3; }
.textbook-page .reader-controls-bar { container-type: inline-size; flex-wrap: nowrap; gap: 6px 8px; padding: 6px 12px; }
.reader-controls-bar .reader-segmented button { min-width: 30px; padding: 7px 8px; }
.reader-controls-bar > .reader-checkbox { flex: 0 0 auto; gap: 4px; font-size: 13px; }
.reader-controls-bar .reader-context-bar { display: contents; }
.reader-controls-bar #reader-change-filter { flex: 0 0 92px; width: 92px; max-width: 92px; height: 32px; padding: 4px 5px; font-size: 13px; }
.reader-controls-bar #reader-diff-count { flex: 0 0 auto; font-size: 12px; color: var(--text-muted); }
.reader-summary-slot { flex: 1 1 0; width: auto; display: flex; min-width: 0; }
.textbook-page .reader-summary-button { display: block; width: 100%; min-width: 0; max-width: 100%; height: 32px; padding: 6px 10px; overflow: hidden; border: 0; border-radius: 6px; background: #fff0a8; color: #73520a; text-align: center; cursor: pointer; }
.reader-controls-bar #reader-change-summary { display: inline-block; width: max-content; max-width: none; min-width: 0; margin: 0; padding: 0; color: inherit; font-size: 13px; font-weight: 600; line-height: 20px; white-space: nowrap; overflow: visible; }
.reader-summary-button:has(.is-overflowing) { text-align: left; }
#reader-change-summary.is-overflowing { animation: reader-summary-scroll var(--summary-duration,20s) linear 1.6s infinite alternate; }
.reader-summary-button:hover #reader-change-summary,.reader-summary-button:focus-visible #reader-change-summary { animation-play-state: paused; }
@keyframes reader-summary-scroll { from { transform: translateX(0); } to { transform: translateX(calc(-1 * var(--summary-distance,0px))); } }
body.dark-theme .reader-summary-button { background: #51421b; color: #ffe589; }
.reader-controls-bar .reader-main-actions { flex: 0 0 auto; gap: 3px; margin-left: auto; }
.reader-controls-bar .reader-annotation-button,.reader-controls-bar .reader-fullscreen-button { padding-inline: 6px; font-size: 13px; }
.textbook-page .reader-controls-bar > #reader-enlarge { top: calc(100% + 10px); }
.reader-more-popover { display: grid; grid-template-columns: 48px minmax(0,1fr); }
.reader-more-popover #reader-zoom,.reader-more-popover #reader-quality { width: 100%; max-width: none; height: 30px; font-size: 12px; }
.reader-more-popover .reader-layer-options,.reader-more-popover .reader-backup-tools { grid-column: 1 / -1; }
body.is-reader-fullscreen .reader-main { grid-template-rows: 0 auto minmax(0,1fr); }
@media(max-width:520px) {
  .textbook-page .reader-controls-bar { display: grid; grid-template-columns: auto auto minmax(0,1fr) auto; padding-inline: 8px; gap: 6px; }
  .reader-controls-bar .reader-segmented { grid-column: 1; grid-row: 1; }
  .reader-controls-bar .reader-segmented button { min-width: 28px; padding-inline: 6px; }
  .reader-controls-bar > .reader-checkbox { grid-column: 2; grid-row: 1; }
  .reader-controls-bar #reader-change-filter { grid-column: 3; grid-row: 1; }
  .reader-controls-bar #reader-diff-count { grid-column: 4; grid-row: 1; }
  .reader-controls-bar .reader-main-actions { grid-column: 3 / -1; grid-row: 1; justify-self: end; }
  .reader-controls-bar:has(#reader-context-bar:not([hidden])) .reader-main-actions { grid-row: 2; z-index: 1; }
  .reader-summary-slot { grid-column: 1 / -1; grid-row: 2; width: 100%; padding-right: 114px; pointer-events: none; }
  .reader-summary-button { pointer-events: auto; }
}
@media(max-width:360px) {
  .reader-controls-bar #reader-diff-count { grid-column: 1; grid-row: 2; }
  .reader-summary-slot { padding-left: 40px; }
}
@media(prefers-reduced-motion:reduce) {
  #reader-change-summary.is-overflowing { animation: none; max-width: 100%; overflow: hidden; text-overflow: ellipsis; }
}
.reader-summary-dialog { position: fixed; inset: auto; top: 50%; left: 50%; transform: translate(-50%,-50%); margin: 0; width: min(480px,calc(100vw - 32px)); max-height: min(80vh,640px); padding: 20px; overflow: auto; border: 1px solid var(--border-color); border-radius: 14px; background: var(--panel-bg); color: var(--text-main); box-shadow: 0 12px 48px #0003; }
.reader-summary-dialog::backdrop { background: #12252266; }
.reader-summary-dialog header { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.reader-summary-dialog h2 { margin: 0; font-size: 17px; }
.reader-summary-dialog header button { border: 0; border-radius: 6px; background: var(--bg-color); color: var(--text-main); padding: 6px 10px; }
.reader-summary-full { margin: 16px 0 0; padding: 12px; border-radius: 8px; background: #fff0a8; color: #73520a; line-height: 1.8; overflow-wrap: anywhere; white-space: pre-wrap; }
body.dark-theme .reader-summary-full { background: #51421b; color: #ffe589; }