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6px;font-size:18px;font-weight:600;line-height:27px}.reader-course-title p{color:var(--reader-secondary);margin:0;font-size:11px;line-height:17px}.lesson-list,.catalog-stage{gap:2px;display:grid}.catalog-stage+.catalog-stage{margin-top:17px}.catalog-stage>h3{color:var(--reader-secondary);margin:0 8px 5px;font-size:11px;font-weight:600;line-height:17px}.lesson-list a{color:#475467;border-radius:7px;grid-template-columns:28px minmax(0,1fr) 17px;align-items:start;gap:6px;min-width:0;padding:8px;display:grid;position:relative}.lesson-list a:hover{color:var(--reader-ink);background:var(--reader-hover)}.lesson-list a.active{color:var(--reader-brand-strong);box-shadow:inset 1px 0 var(--reader-brand);background:#eff4ff}.lesson-order{color:var(--reader-secondary);font-variant-numeric:tabular-nums;padding-top:1px;font-size:11px;font-weight:600;line-height:20px}.lesson-list a.active .lesson-order{color:var(--reader-brand)}.lesson-list strong{overflow-wrap:anywhere;min-width:0;font-size:14px;font-weight:400;line-height:21px;display:block}.lesson-list a.active strong{font-weight:600}.lesson-list i{width:17px;height:17px;color:var(--reader-brand-strong);background:#dce8ff;border-radius:50%;place-items:center;margin-top:2px;font-style:normal;display:grid}.lesson-list i svg{width:11px;height:11px}.reader-sidebar-footer{border-top:1px solid var(--reader-line);gap:7px;margin-top:auto;padding:18px 7px 2px;display:grid}.reader-sidebar-footer a{color:var(--reader-text);font-size:12px;font-weight:600}.reader-sidebar-footer span{color:var(--reader-secondary);font-size:10px;line-height:16px}.reader-main{background:var(--reader-surface);grid-area:2/2;grid-template-columns:minmax(0,820px) 220px;place-content:start center;column-gap:24px;min-width:0;padding:32px 20px 72px;display:grid}.lesson-header{border-bottom:1px solid var(--reader-line);grid-column:1;min-width:0;padding:7px 0 31px}.lesson-breadcrumb{color:var(--reader-secondary);white-space:nowrap;align-items:center;gap:8px;font-size:11px;line-height:18px;display:flex;overflow:hidden}.lesson-breadcrumb a{color:var(--reader-brand-strong);flex:none;font-weight:600}.lesson-breadcrumb span:last-child{text-overflow:ellipsis;overflow:hidden}.lesson-kicker{color:var(--reader-secondary);margin-top:30px;font-size:12px;font-weight:600;line-height:18px;display:block}.lesson-header h1{color:var(--reader-ink);letter-spacing:-.025em;overflow-wrap:anywhere;margin:9px 0 12px;font-size:36px;font-weight:600;line-height:48px}.lesson-header>p{max-width:820px;color:var(--reader-secondary);overflow-wrap:anywhere;margin:0;font-size:15px;line-height:26px}.reader-content{grid-column:1;min-width:0;min-height:700px;position:relative}.reader-blocks{z-index:2;min-width:0;padding:24px 0 16px;position:relative}.reader-blocks>h2,.reader-blocks>h3{color:var(--reader-ink);overflow-wrap:anywhere;scroll-margin-top:76px}.reader-blocks>h2{letter-spacing:-.015em;margin:47px 0 15px;font-size:26px;font-weight:600;line-height:38px}.reader-blocks>h2:first-child{margin-top:0}.reader-blocks>h3{letter-spacing:-.008em;margin:33px 0 11px;font-size:21px;font-weight:600;line-height:32px}.reader-blocks>p{width:100%;max-width:none;color:var(--reader-text);overflow-wrap:anywhere;word-break:break-word;margin:0 0 15px;font-size:17px;line-height:30px}.reader-blocks>.reader-lead{color:var(--reader-ink);margin-bottom:31px;font-size:18px;font-weight:500;line-height:31px}.reader-inline-code{border:1px solid var(--reader-line);background:var(--reader-hover);color:#273142;overflow-wrap:anywhere;-webkit-box-decoration-break:clone;box-decoration-break:clone;border-radius:4px;padding:.08em .32em;font:.88em/1.55 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace}.reader-blocks>ul,.reader-blocks>ol{color:var(--reader-text);margin:7px 0 23px;padding-left:1.55em}.reader-blocks>ul{list-style:outside}.reader-blocks>ol{list-style:decimal}.reader-blocks>ul li,.reader-blocks>ol li{color:var(--reader-text);overflow-wrap:anywhere;word-break:break-word;margin:3px 0;padding-left:.2em;font-size:17px;line-height:30px}.reader-blocks>ul li::marker{color:#7a8493;font-weight:500}.reader-blocks>ol li::marker{color:#7a8493;font-weight:500}.reader-math{color:var(--reader-ink);font-family:KaTeX_Main,Times New Roman,serif}.reader-math-inline{vertical-align:-.08em;max-width:100%;margin:0 .1em;font-size:1.03em;line-height:1.35;display:inline-block}.reader-math-display{width:100%;max-width:100%;color:var(--reader-ink);text-align:center;overscroll-behavior-inline:contain;background:0 0;border:0;border-radius:0;margin:23px 0 25px;padding:4px 0;font-size:1.08em;line-height:1.5;display:block;overflow:auto hidden}.reader-math-display .katex-display{min-width:max-content;margin:0}.reader-math-error{color:#9b3b2f;background:#fff1ef;border-radius:4px;max-width:100%;padding:2px 6px;font:500 .9em/1.5 ui-monospace,monospace;display:inline-block;overflow-x:auto}.reader-callout{background:#f2f6ff;border:1px solid #cfe0ff;border-radius:8px;gap:13px;margin:27px 0 31px;padding:17px 18px;display:flex}.reader-callout>span{color:#fff;background:var(--reader-brand);border-radius:6px;flex:none;place-items:center;width:24px;height:24px;display:grid}.reader-callout>span svg{width:15px;height:15px}.reader-callout strong{color:var(--reader-ink);margin:0 0 5px;font-size:15px;line-height:23px;display:block}.reader-callout p{color:var(--reader-text);margin:0;font-size:16px;line-height:28px}.reader-callout.warning{background:#fffaeb;border-color:#f4d7a1}.reader-callout.warning>span{background:#b54708}.reader-callout.warning p{color:#5f4b2f}.reader-checkpoint{color:#f4f7fb;background:var(--reader-ink);border-radius:10px;margin:35px 0 39px;padding:25px 27px}.checkpoint-label{color:#9dbcfb;font-size:11px;font-weight:700;line-height:17px}.reader-checkpoint h3{color:#fff;margin:7px 0 17px;font-size:21px;font-weight:600;line-height:32px}.reader-checkpoint ul{gap:10px;margin:0;padding:0;list-style:none;display:grid}.reader-checkpoint li{color:#d8dee8;overflow-wrap:anywhere;align-items:flex-start;gap:10px;font-size:15px;line-height:25px;display:flex}.reader-checkpoint li i{color:#fff;background:var(--reader-brand);border-radius:50%;flex:none;place-items:center;width:19px;height:19px;margin-top:3px;font-style:normal;display:grid}.reader-checkpoint li i svg{width:11px;height:11px}.reader-checkpoint .reader-inline-code{color:#edf2f8;background:#243247;border-color:#475467}.reader-table-scroll{border:1px solid var(--reader-line);background:var(--reader-surface);overscroll-behavior-inline:contain;border-radius:8px;width:100%;max-width:100%;margin:27px 0 34px;overflow-x:auto}.reader-table{border-collapse:collapse;table-layout:auto;background:var(--reader-surface);border:0;width:100%;min-width:620px}.reader-table th,.reader-table td{min-width:140px;color:var(--reader-text);text-align:left;vertical-align:top;overflow-wrap:anywhere;border-bottom:1px solid #e7e9ed;border-right:1px solid #e7e9ed;padding:11px 13px;font-size:14px;line-height:22px}.reader-table th{color:var(--reader-ink);background:#f1f3f5;font-weight:600}.reader-table th:last-child,.reader-table td:last-child{border-right:0}.reader-table tbody tr:last-child td{border-bottom:0}.reader-download{color:#1f4f91;background:#f7faff;border:1px solid #cfe0ff;border-radius:8px;grid-template-columns:34px minmax(0,1fr);align-items:center;column-gap:12px;margin:23px 0 31px;padding:14px 16px;text-decoration:none;display:grid}.reader-download>span{color:#fff;background:var(--reader-brand);border-radius:7px;grid-row:1/span 2;place-items:center;width:34px;height:34px;font-weight:700;display:grid}.reader-download strong{min-width:0;font-size:14px;line-height:21px}.reader-download small{color:var(--reader-secondary);text-overflow:ellipsis;white-space:nowrap;margin-top:2px;font:11px/17px ui-monospace,monospace;overflow:hidden}.reader-download:hover{background:#eef4ff;border-color:#9dbcf1}.reader-image{text-align:center;width:100%;margin:28px 0 35px}.reader-image-trigger{width:min(100%, var(--reader-image-natural-width));max-width:100%;color:inherit;cursor:zoom-in;background:0 0;border:0;border-radius:6px;margin:0 auto;padding:0;display:block}.reader-image-trigger img{object-fit:contain;background:0 0;border:0;border-radius:6px;width:100%;max-width:100%;height:auto;margin:0 auto;display:block}.reader-image[data-engine=xiaohei] .reader-image-trigger img{border:1px solid var(--reader-line)}.reader-image figcaption{color:var(--reader-secondary);text-align:center;margin-top:8px;font-size:13px;line-height:21px}.reader-image-dialog{border:1px solid var(--reader-line);width:min(1180px,100vw - 48px);max-width:none;max-height:calc(100dvh - 48px);color:var(--reader-text);background:var(--reader-surface);border-radius:10px;margin:auto;padding:44px 24px 20px;overflow:auto;box-shadow:0 24px 70px #1018283d}.reader-image-dialog::backdrop{background:#111827b8}.reader-image-dialog>img{object-fit:contain;width:auto;max-width:100%;height:auto;max-height:calc(100dvh - 145px);margin:0 auto;display:block}.reader-image-dialog>p{color:var(--reader-secondary);text-align:center;margin:12px auto 0;font-size:13px;line-height:21px}.reader-image-close{border:1px solid var(--reader-line);width:32px;height:32px;color:var(--reader-text);background:var(--reader-surface);cursor:pointer;border-radius:7px;place-items:center;font-size:22px;line-height:1;display:grid;position:absolute;top:9px;right:10px}.reader-image-close:hover{background:var(--reader-hover)}.course-figure{color:var(--figure-ink);margin:28px 0 38px}.course-figure-mermaid{background:0 0;padding:0}.mermaid-canvas{width:100%;overflow:hidden}.mermaid-canvas svg{background:0 0;width:100%;height:auto;display:block;overflow:visible}.snake-link,.snake-turn{stroke:var(--figure-accent);stroke-width:7px;fill:none}.snake-turn{stroke-width:8px}.snake-node rect{fill:var(--figure-soft);stroke:var(--figure-accent);stroke-width:4px}.snake-node circle{fill:var(--figure-accent)}.snake-index{fill:#fff;text-anchor:middle;font:800 21px/1 ui-monospace,monospace}.snake-label{fill:var(--figure-ink);text-anchor:middle;font:700 27px/1.25 Noto Sans SC,Microsoft YaHei,sans-serif}.course-figure-html{border:1px solid color-mix(in srgb, var(--figure-accent) 30%, #fff);color:#17212b;background:#fff;border-radius:10px;padding:23px}.html-figure-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px;display:grid}.html-figure-grid article{border:1px solid color-mix(in srgb, var(--figure-accent) 24%, #fff);background:#fff;border-radius:8px;min-width:0;padding:16px 17px}.html-figure-grid article>span{color:var(--figure-accent);font:800 10px/1 ui-monospace,monospace}.html-figure-grid h4{color:#17212b;margin:8px 0 6px;font-size:15px;line-height:23px}.html-figure-grid p{color:#334155;margin:0;font-size:13px;font-weight:500;line-height:21px}.code-block{border:1px solid var(--reader-line);background:var(--reader-code);width:100%;max-width:100%;box-shadow:none;-webkit-user-select:text;user-select:text;border-radius:8px;margin:29px 0 36px;overflow:hidden}.code-block header{border-bottom:1px solid var(--reader-line);background:#eef0f2;justify-content:space-between;align-items:center;gap:12px;min-height:40px;padding:6px 10px 6px 13px;display:flex}.code-block header div{align-items:center;gap:9px;min-width:0;display:flex}.code-block header span{color:var(--reader-brand-strong);text-transform:uppercase;background:#dce8ff;border-radius:4px;flex:none;padding:3px 5px;font:700 10px/14px ui-monospace,monospace}.code-block header strong{min-width:0;color:var(--reader-secondary);text-overflow:ellipsis;white-space:nowrap;font:500 11px/17px ui-monospace,monospace;overflow:hidden}.code-block button{border:1px solid var(--reader-line-strong);min-height:28px;color:var(--reader-text);background:var(--reader-surface);cursor:pointer;border-radius:6px;flex:none;padding:0 8px;font-size:11px}.code-block button:hover{color:var(--reader-ink);background:#fafbfc;border-color:#98a2b3}.code-block pre{color:#273142;background:var(--reader-code);tab-size:2;overscroll-behavior-inline:contain;max-width:100%;margin:0;padding:17px 18px;font:14px/23px ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;overflow:auto}.watermark-layer{z-index:5;pointer-events:none;opacity:.14;grid-template-columns:repeat(2,minmax(0,1fr));align-content:space-around;display:grid;position:absolute;inset:0;overflow:hidden}.watermark-layer span{color:#506070;overflow-wrap:anywhere;text-align:center;white-space:normal;justify-self:center;width:min(300px,92%);font:700 9px/1.45 ui-monospace,monospace;transform:rotate(-22deg)}.protected-copy{-webkit-user-select:none;user-select:none}.copy-allowed,.copy-allowed *{-webkit-user-select:text;user-select:text}.load-sentinel{overflow-anchor:none;min-height:88px;color:var(--reader-secondary);justify-content:center;align-items:center;gap:9px;font-size:12px;line-height:20px;display:flex}.load-sentinel i{border:2px solid var(--reader-line);border-top-color:var(--reader-brand);border-radius:50%;width:15px;height:15px;animation:.8s linear infinite reader-spin}.lesson-finished{color:#067647;background:#ecfdf3;border-radius:7px;align-items:center;gap:7px;padding:7px 10px;display:inline-flex}.lesson-finished svg{width:16px;height:16px}.reader-error{background:#fff1ef;border:1px solid #f1c9c2;border-radius:8px;margin:27px 0;padding:16px 17px}.reader-error strong{font-size:14px;line-height:21px}.reader-error p{color:#8a5048;margin:5px 0 11px;font-size:13px;line-height:21px}.reader-error button{color:#fff;cursor:pointer;background:#9b3b2f;border:0;border-radius:6px;min-height:34px;padding:0 11px;font-size:12px}@keyframes reader-spin{to{transform:rotate(360deg)}}.desktop-outline-hover-zone{z-index:60;width:40px;height:42px;position:fixed;top:68px;left:228px}.desktop-outline-trigger{border:1px solid var(--reader-line-strong);width:40px;height:42px;color:var(--reader-secondary);background:var(--reader-surface);cursor:pointer;border-radius:7px;align-content:center;place-items:center;gap:1px;padding:0;transition:border-color .16s ease-out,color .16s ease-out,background-color .16s ease-out;display:grid}.mobile-reader-navigation>summary::-webkit-details-marker{display:none}.desktop-outline-trigger svg{width:16px;height:16px;color:var(--reader-brand)}.desktop-outline-trigger span{font-size:9px;font-weight:600;line-height:11px}.desktop-outline-hover-zone[data-visible=true] .desktop-outline-trigger{color:var(--reader-brand-strong);background:#f7faff;border-color:#9dbcf1}.desktop-outline-panel{visibility:hidden;opacity:0;pointer-events:none;width:312px;padding-top:8px;transition:opacity .16s ease-out,transform .16s ease-out,visibility 0s linear .16s;display:block;position:absolute;top:42px;left:58px;transform:translateY(-4px)}.desktop-outline-hover-zone[data-visible=true] .desktop-outline-panel{visibility:visible;opacity:1;pointer-events:auto;transition-delay:0s;transform:translateY(0)}.desktop-outline-content{overscroll-behavior:contain;border:1px solid var(--reader-line);background:var(--reader-surface);border-radius:9px;max-height:calc(100dvh - 134px);padding:15px 14px 17px;display:block;overflow:auto;box-shadow:0 18px 48px #1018282e}.desktop-outline-content header{padding:0 6px 10px}.desktop-outline-content header span{color:var(--reader-secondary);font-size:10px;font-weight:600;line-height:16px}.desktop-outline-content h2{color:var(--reader-ink);margin:2px 0 0;font-size:15px;font-weight:600;line-height:23px}.desktop-outline-content nav{padding-bottom:2px}.desktop-outline-content nav a{color:var(--reader-secondary);overflow-wrap:anywhere;border-radius:5px;margin:1px 0;padding:6px;font-size:13px;line-height:20px;display:block}.desktop-outline-content nav a:hover{color:var(--reader-ink);background:var(--reader-hover)}.desktop-outline-content nav a[aria-current=location]{color:var(--reader-brand-strong);background:#eff4ff;font-weight:600}.desktop-outline-content nav a.outline-level-three{padding-left:21px;font-size:12px}.desktop-outline-content nav p{color:var(--reader-tertiary);margin:3px 6px;font-size:12px;line-height:20px}.mobile-reader-navigation{display:none}.lesson-pagination{border-top:1px solid var(--reader-line);grid-column:1;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;min-width:0;margin-top:35px;padding-top:24px;display:grid}.lesson-pagination>a{border:1px solid var(--reader-line);min-width:0;color:var(--reader-text);background:var(--reader-surface);border-radius:8px;padding:14px 16px}.lesson-pagination>a:hover{background:#fafbfc;border-color:#aeb5bf}.lesson-pagination>a.next{border-color:var(--reader-brand);color:#fff;background:var(--reader-brand);text-align:right}.lesson-pagination>a.next:hover{border-color:var(--reader-brand-strong);background:var(--reader-brand-strong)}.lesson-pagination>a span,.lesson-pagination>a strong{text-overflow:ellipsis;white-space:nowrap;display:block;overflow:hidden}.lesson-pagination>a span{color:var(--reader-secondary);margin-bottom:5px;font-size:11px;line-height:17px}.lesson-pagination>a.next span{color:#f3f7ff}.lesson-pagination>a strong{font-size:13px;line-height:21px}@media (width<=1359px){.reader-main{grid-template-columns:minmax(0,820px)}}@media (width<=1100px){.reader-topbar{grid-template-columns:226px minmax(170px,1fr) 190px;gap:16px;padding-right:18px}.reader-topbar-actions{display:none}}@media (width<=820px){.reader-page{min-height:100dvh;display:block}.reader-topbar{grid-template-columns:auto minmax(0,1fr);gap:13px;height:56px;padding:0 72px 0 16px;position:sticky}.reader-topbar .brand{font-size:14px}.reader-topbar-course{display:block}.reader-topbar-course span{font-size:9px;line-height:14px}.reader-topbar-course strong{font-size:11px;line-height:16px}.reader-path-progress,.reader-topbar-actions,.reader-sidebar,.desktop-outline-hover-zone{display:none}.reader-main{width:100%;padding:25px 20px 62px;display:block}.lesson-header{padding:0 0 27px}.lesson-kicker{margin-top:24px}.lesson-header h1{letter-spacing:-.018em;margin-top:7px;font-size:28px;line-height:38px}.lesson-header>p{font-size:15px;line-height:25px}.reader-blocks{padding-top:21px}.reader-blocks>h2{margin-top:42px;margin-bottom:13px;font-size:23px;line-height:34px}.reader-blocks>h3{margin-top:31px;margin-bottom:10px;font-size:20px;line-height:30px}.reader-blocks>p,.reader-blocks>ul li,.reader-blocks>ol li,.reader-blocks>.reader-lead{font-size:17px;line-height:29px}.reader-callout{padding:15px 16px}.reader-checkpoint{padding:22px 20px}.reader-table{min-width:580px}.code-block pre{padding:16px;font-size:14px;line-height:22px}.reader-image 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