/* 中文阅读字体统一优先苹方和微软雅黑，长表格仅在自身区域横向滚动。 */
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/* 原图对照置于图下右侧，保留可见焦点与足够的点击区域。 */
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.figure-original-toggle{border:0;border-radius:0;padding:6px 0;min-height:30px;background:transparent;color:var(--muted);font-size:11px;line-height:1.6}
.figure-original-toggle:hover{background:transparent;color:var(--ink);text-decoration:underline;text-underline-offset:3px}
/* 全书章名常驻列表，小节由原生折叠控件展开；目录滚动不传递到正文。 */
.rail{min-height:0}.rail>.book-label,.rail>.book-subtitle,.rail>.nav-heading,.rail>.rail-footer{flex-shrink:0}
.rail .book-toc{position:relative;min-height:0;overscroll-behavior:contain;padding-block:2px 12px}
.toc-chapter{margin:0 0 3px}.toc-chapter-row{display:flex;align-items:flex-start;gap:1px;list-style:none;cursor:pointer;border-radius:3px}
.toc-chapter-row::-webkit-details-marker{display:none}.toc-chapter-row:hover{background:#e9ecdf}
.chapter-chevron{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:22px;height:34px;font-size:20px;line-height:1;color:var(--muted);transition:transform .15s}
.toc-chapter[open]>.toc-chapter-row .chapter-chevron{transform:rotate(90deg)}
.rail .toc-chapter-row .toc-chapter-link{flex:1;min-width:0;padding:7px 4px 7px 0;border:0;font-size:12px;line-height:1.7;font-weight:400;overflow-wrap:anywhere}
.toc-chapter.is-current>.toc-chapter-row{background:#e3e9dc}.rail .toc-chapter-link[aria-current="page"]{color:var(--accent);font-weight:600}
.toc-sections{margin:1px 0 10px 11px;padding-left:12px;border-left:1px solid var(--rule)}
.rail .toc-sections a{padding:5px 4px 5px 9px;font-size:11px;line-height:1.7;font-weight:400}
.rail .toc-sections .nav-level-2{font-weight:500;color:var(--ink)}.rail .toc-sections .nav-level-3{padding-left:17px;font-size:10px}
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/* 窄屏对照窗口优先留足页码选择和关闭按钮的空间。 */
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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
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/* 相邻章节与总目录沿用统一阅读版式。 */
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@media(max-width:600px){.index-main{padding:30px 22px 60px}.book-title{font-size:37px}.book-years{font-size:29px}.book-grid{grid-template-columns:1fr}.entry-title{font-size:16px}.chapter-pagination{gap:20px}.hero .chapter-name{overflow-wrap:anywhere;text-wrap:balance}}
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