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.learning-markdown>h1:first-child{font-size:clamp(38px,4.4vw,58px);line-height:1.08}
.learning-system-links{display:grid;gap:10px;margin:0 18px 24px}.learning-system-links .learning-index-link{margin:0}
.reading-progress{position:fixed;top:82px;right:0;left:340px;z-index:40;height:3px;pointer-events:none}.reading-progress i{display:block;width:100%;height:100%;transform:scaleX(0);transform-origin:left;background:var(--acid)}
.reading-actions{display:flex;align-items:center;gap:14px}.reading-tools{display:flex;padding:3px;border:1px solid #d5d1db;border-radius:6px;background:#f5f4f7}.reading-tools button{min-width:38px;height:34px;padding:0 9px;border:0;border-right:1px solid #ddd9e2;background:transparent;color:var(--ink-2);font-weight:700;cursor:pointer}.reading-tools button:last-child{min-width:52px;border-right:0}.reading-tools button:hover,.reading-tools button:focus-visible{color:var(--purple);background:#fff}
.learning-document-layout{display:grid;grid-template-columns:minmax(0,820px) minmax(150px,190px);gap:44px;justify-content:center;max-width:1260px;margin:0 auto;padding:0 34px}.learning-document-layout .learning-markdown{width:100%;max-width:none;margin:0;padding:clamp(42px,6vw,82px) 0}.learning-markdown p,.learning-markdown li{font-size:calc(18px * var(--reading-scale,1));line-height:1.9}.learning-markdown blockquote{font-size:calc(16px * var(--reading-scale,1));line-height:1.8}
.learning-toc{position:sticky;top:235px;align-self:start;max-height:calc(100vh - 265px);margin-top:82px;overflow-y:auto;border-left:1px solid var(--line);padding-left:18px}.learning-toc>p{margin:0 0 14px;color:var(--muted);font:750 11px/1 ui-monospace,monospace;letter-spacing:.11em}.learning-toc nav{display:grid;gap:8px}.learning-toc a{color:var(--muted);font-size:13px;line-height:1.45;text-decoration:none}.learning-toc a:hover{color:var(--purple)}.learning-toc .toc-h3{padding-left:13px;font-size:12px}.wide-reading .learning-document-layout{grid-template-columns:minmax(0,1000px) minmax(150px,190px);max-width:1440px}.wide-reading .learning-markdown p{max-width:1000px}
@media(max-width:980px){.reading-progress{left:280px}.learning-document-layout,.wide-reading .learning-document-layout{display:block;max-width:900px;padding:0 36px}.learning-toc{display:none}.learning-document-layout .learning-markdown{padding:48px 0}}
@media(max-width:720px){.reading-progress{top:70px;left:0}.learning-system-links{margin:0 20px 18px}.learning-system-links .learning-index-link{margin:0}.learning-reader-head{align-items:flex-start}.reading-actions{margin-left:auto}.reading-tools button{min-width:34px;padding:0 6px}.reading-tools button:last-child{display:none}.learning-document-layout,.wide-reading .learning-document-layout{padding:0 20px}.learning-document-layout .learning-markdown{padding:32px 0}.learning-markdown p,.learning-markdown li{font-size:calc(17px * var(--reading-scale,1));line-height:1.85}}

.markdown-body h4{margin:28px 0 12px;font-size:19px}.markdown-body h5{margin:24px 0 10px;font-size:17px}.markdown-body h6{margin:20px 0 10px;font-size:16px}