:root{--paper:#f4f3eb;--ink:#193e38;--jade:#387969;--muted:#707e75;--line:#dcded2;--red:#b75039;--gold:#b39350;--white:#fffef8}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.7 'Segoe UI','Microsoft YaHei',sans-serif}button,input,textarea,select{font:inherit}button,a,input,textarea,select{touch-action:manipulation}button,a{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--gold);outline-offset:4px}header{position:sticky;top:0;z-index:10;background:#f4f3ebed;backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}.bar{max-width:1320px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:14px 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/* EBOOK START */
.book-intro{max-width:760px;color:var(--muted)}.book-layout{display:grid;grid-template-columns:260px minmax(0,1fr);border:1px solid var(--line);border-radius:14px;overflow:clip;background:var(--white)}
.book-sidebar{padding:24px 18px;background:#e8ece2;border-right:1px solid var(--line)}.book-sidebar details{padding:0;border:0}.book-sidebar summary{font-weight:700;margin-bottom:18px}.book-search{margin-bottom:12px}.book-filter{display:flex;gap:8px;margin:12px 0}.book-filter .btn{padding:7px 12px}.book-filter [aria-pressed=true]{background:var(--ink);color:#fff}
.book-toc{display:grid;gap:6px;margin-top:15px}.book-toc button{text-align:left;border:0;background:transparent;color:var(--ink);padding:12px 10px;border-radius:7px;font-size:13px;line-height:1.6}.book-toc button:hover{background:#ffffff88}.book-toc button[aria-current=page]{background:var(--ink);color:#fff}.book-toc small{display:block;opacity:.7;font-size:11px;letter-spacing:1px}.book-reading{min-width:0;padding:28px clamp(20px,4vw,58px);--reading-size:17px}.book-controls{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding-bottom:20px;border-bottom:1px solid var(--line)}.book-controls label{font-size:12px}.book-controls select{width:auto;padding:7px}.book-controls .btn{padding:7px 10px}.book-chapter{max-width:740px;margin:32px auto}.book-chapter h3{font:500 clamp(26px,3vw,38px)/1.5 'STSong','SimSun',serif;margin:12px 0}.book-deck{color:var(--jade);font-size:16px}.book-chapter h4{font-size:20px;margin:36px 0 14px}.book-chapter p{font-size:var(--reading-size);line-height:2.05;margin:14px 0;overflow-wrap:anywhere}.book-case{border-left:3px solid var(--gold);background:#f0eddf;padding:16px 22px;margin:30px 0}.book-case h4{margin:0}.book-chapter .book-case p{font-size:calc(var(--reading-size) - 1px)}.book-exercise{border:1px solid var(--line);border-radius:10px;padding:20px;margin-top:26px}.book-exercise h4{margin:0}.book-bottom{max-width:740px;margin:auto}.book-bottom textarea{min-height:130px}.book-pager{display:flex;gap:10px;justify-content:space-between;flex-wrap:wrap;margin-top:20px}.book-pager button:disabled{opacity:.4;cursor:default}.book-reading[data-tone=night]{background:#172c28;color:#e4e8db}.book-reading[data-tone=night] .book-deck{color:#aac9b7}.book-reading[data-tone=night] .book-case{background:#283d35}.book-reading[data-tone=night] .caption,.book-reading[data-tone=night] .fieldlabel{color:#b8c5b8}.book-reading[data-tone=night] .book-exercise{border-color:#526258}.book-reading[data-tone=night] a.book-tool{color:#173e38}.book-meta{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:10px;font-size:12px}.book-hidden,[hidden]{display:none!important}.book-note-status{font-size:12px;color:var(--muted)}
@media(max-width:760px){.book-layout{grid-template-columns:1fr}.book-sidebar{border-right:0;border-bottom:1px solid var(--line);padding:18px}.book-toc{max-height:300px;overflow:auto}.book-reading{padding:20px 18px}.book-chapter p{line-height:1.95}.book-case{padding:14px}.book-controls{gap:7px}.book-controls .btn{font-size:12px}.hero-actions{flex-wrap:wrap}}
@media print{body{background:#fff!important;color:#111!important}header,.cloudbar,.sync-warning,.cloud-loading,dialog,#toast,main> :not(#ebook),#ebook>.section-head,#ebook>.book-intro,.book-sidebar,.book-controls,.book-bottom,.book-tool{display:none!important}main{max-width:none;padding:0}#ebook{padding:0}.book-layout{display:block;border:0;background:#fff}.book-reading,.book-reading[data-tone=night]{padding:0;background:#fff;color:#111}.book-chapter,.book-chapter[hidden]{display:block!important;max-width:none;break-before:page}.book-chapter:first-child{break-before:auto}.book-chapter p{font-size:11pt;line-height:1.8}.book-chapter h3{font-size:22pt}.book-chapter h4{break-after:avoid}.book-case{background:#f5f5f5!important;break-inside:avoid}.book-deck{color:#333!important}}
/* EBOOK END */