:root{color-scheme:light;--ink:#171717;--muted:#686868;--line:#dededb;--paper:#fff;--wash:#f7f7f4;--serif:"Songti SC","Noto Serif CJK SC","Source Han Serif SC",STSong,SimSun,Georgia,serif;--sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}html{scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.95 var(--sans);-webkit-font-smoothing:antialiased}a{color:inherit;text-underline-offset:4px;text-decoration-thickness:1px}a:hover{color:#555}a:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:2px solid #555;outline-offset:4px}button,input,select{font:inherit}p,h1,h2,h3,h4,ul,ol,blockquote,pre{margin-top:0}p{margin-bottom:1.1em}h1,h2,h3,h4{font-family:var(--serif);font-weight:700;line-height:1.5}h1{font-size:34px;margin-bottom:24px}h2{font-size:27px;margin:2em 0 .8em}h3{font-size:23px;margin:1.7em 0 .65em}h4{font-size:20px}li{margin-bottom:.35em}ul,ol{padding-left:1.6em}img{max-width:100%;height:auto}hr{border:0;border-top:1px solid var(--line);margin:32px 0}small{color:var(--muted)}[hidden]{display:none!important}::selection{background:#e5e5e0;color:#111}
.book-header,.book-footer{width:min(1040px,calc(100% - 64px));margin-inline:auto}.book-header{padding:28px 0 0}.book-brand{display:inline-block;font:700 29px/1.5 var(--serif);text-decoration:none}.book-topnav{display:flex;flex-wrap:wrap;gap:12px 26px;font-size:13px;border-block:1px solid var(--line);padding:13px 0;margin-top:18px}.book-topnav a{text-decoration:none}.book-topnav a:hover{text-decoration:underline}.book-topnav [download]{margin-left:auto}.book-layout{width:min(760px,calc(100% - 64px));margin:28px auto 56px;min-width:0}.book-sidebar{margin-bottom:28px;min-width:0}.reader-toc{border-bottom:1px solid var(--line);font-size:14px}.reader-toc>summary{cursor:pointer;padding:12px 0;font-weight:500;list-style-position:inside}.reader-toc[open]>summary{border-bottom:1px solid var(--line)}.book-toc{padding:12px 0 22px}.book-toc h3{font:600 14px/1.8 var(--sans);margin:18px 0 8px}.book-toc ol{margin:0;padding-left:1.6em}.book-toc li{padding:3px 0;margin:0}.book-toc a{text-decoration:none}.book-toc a:hover{text-decoration:underline}.book-toc [aria-current=page]{font-weight:700;text-decoration:underline}.book-toc [aria-current=page]::after{content:" · 当前";font-size:11px;color:var(--muted);font-weight:400}
.book-content{min-width:0;overflow-wrap:anywhere}.chapter-header{border-bottom:1px solid var(--line);margin-bottom:30px;padding-bottom:24px}.chapter-header h1{margin:6px 0 0}.chapter-part{font-size:12px;color:var(--muted);margin:0}.book-content>h1:first-child{margin-top:0}.book-content blockquote{margin:24px 0;padding:2px 0 2px 20px;border-left:2px solid #b8b8b1;color:#444}.book-content blockquote>p:last-child{margin-bottom:0}.book-content code{font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;font-size:.85em;background:var(--wash);padding:2px 4px}.book-content pre{padding:20px;border:1px solid var(--line);background:var(--wash);white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:1.85;overflow-x:auto}.book-content pre code{background:none;padding:0;font-size:inherit}.table-wrap{width:100%;max-width:100%;overflow:auto;margin:24px 0}.book-content table{width:100%;border-collapse:collapse;font-size:14px;line-height:1.8;text-align:left}.book-content th,.book-content td{vertical-align:top;border-bottom:1px solid var(--line);padding:12px 14px 12px 0;min-width:90px;overflow-wrap:anywhere}.book-content th{font-weight:600;border-top:1px solid var(--ink);border-bottom:1px solid #aaa}.book-content td:last-child,.book-content th:last-child{padding-right:0}.book-content table a{overflow-wrap:anywhere}.book-content strong{font-weight:650}.book-pagination{display:grid;grid-template-columns:1fr 1fr;gap:28px;border-block:1px solid var(--line);padding:24px 0;margin-top:46px;line-height:1.75}.book-pagination a{text-decoration:none;font:600 18px/1.75 var(--serif);min-width:0}.book-pagination a:hover span{text-decoration:underline}.book-pagination small{display:block;font:12px/1.8 var(--sans);margin-bottom:6px}.book-pagination a:last-child{text-align:right}.book-footer{border-top:1px solid var(--line);padding:22px 0 32px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 20px;font-size:12px;color:var(--muted)}.book-footer p{margin:0}.book-footer a{white-space:nowrap}.skip-link{position:absolute;left:16px;top:-90px;background:var(--ink);color:#fff;padding:8px 12px;z-index:10}.skip-link:focus{top:10px}
.book-index{width:min(760px,calc(100% - 64px));margin:38px auto 56px}.book-intro{padding-bottom:28px;border-bottom:1px solid var(--ink)}.book-intro h1{margin:0 0 12px;font-size:38px}.book-intro p{font-size:16px;line-height:1.9;max-width:660px}.book-intro .book-meta,.book-meta{font-size:12px;color:var(--muted)}.book-actions{display:flex;flex-wrap:wrap;align-items:center;gap:16px 24px;margin:22px 0 0;font-size:14px}.book-actions a:first-child{background:var(--ink);color:#fff;padding:8px 18px;text-decoration:none}.book-group{padding:28px 0 6px}.book-group h2{margin:0 0 10px;font-size:24px}.book-chapter-list{list-style:none;padding:0;margin:0}.book-chapter-list li{margin:0;border-bottom:1px solid var(--line)}.book-chapter-list a{display:block;padding:16px 0;text-decoration:none;font-family:var(--serif);font-size:21px;line-height:1.65}.book-chapter-list a:hover{text-decoration:underline}.book-chapter-list small{display:block;font:12px/1.7 var(--sans);margin-top:4px}.book-chapter-list .chapter-number{font:italic 14px/1.8 var(--serif);color:var(--muted);margin-right:14px}.book-intro-link{font-size:16px}
@media(max-width:650px){body{font-size:16px;line-height:1.95}.book-header,.book-footer,.book-layout,.book-index{width:calc(100% - 32px)}.book-header{padding-top:22px}.book-brand{font-size:26px}.book-topnav{gap:10px 20px;font-size:12px;margin-top:15px;padding:12px 0}.book-topnav [download]{margin-left:0}.book-layout{margin-top:18px}.book-sidebar{margin-bottom:24px}.reader-toc{font-size:13px}.reader-toc summary{padding:10px 0}.book-toc h3{font-size:13px}.book-toc li{padding:5px 0}.chapter-header{padding-bottom:20px;margin-bottom:24px}.chapter-header h1{font-size:28px;line-height:1.6}.chapter-part{font-size:11px}h2{font-size:24px}h3{font-size:21px}h4{font-size:19px}.book-content blockquote{padding-left:14px;margin:20px 0}.book-content pre{font-size:13px;padding:14px}.book-content table{font-size:13px;min-width:590px}.book-content th,.book-content td{padding:10px 12px 10px 0}.book-pagination{gap:20px;margin-top:32px;padding:20px 0}.book-pagination a{font-size:16px}.book-pagination small{font-size:11px}.book-footer{font-size:11px;padding:20px 0 28px}.book-index{margin-top:28px}.book-intro h1{font-size:31px}.book-intro p{font-size:15px}.book-actions{font-size:13px;gap:14px 20px}.book-group{padding-top:25px}.book-group h2{font-size:22px}.book-chapter-list a{font-size:19px;padding:14px 0}}
@media print{body{font-size:11pt;color:#000}.book-header,.book-sidebar,.book-pagination,.book-footer{display:none}.book-layout,.book-index{width:100%;margin:0}.chapter-header{border:0}.book-content a{text-decoration:none}.table-wrap{overflow:visible}.book-content table{min-width:0;font-size:9pt}.book-content h2,.book-content h3{break-after:avoid}.book-content pre,blockquote{break-inside:avoid}}