:root{color-scheme:light;--paper:#fff;--canvas:#fafbfc;--ink:#25313c;--muted:#606d79;--line:#dce3e8;--accent:#245c83;--tint:#eef5f9;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;font-size:16px;color:var(--ink);background:var(--canvas)}
*{box-sizing:border-box}body{margin:0}a{color:var(--accent);text-underline-offset:.2em}a:hover{text-decoration-thickness:2px}a:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #4182b0;outline-offset:4px}button,summary,a{-webkit-tap-highlight-color:transparent}
.site-header{min-height:88px;padding:20px 38px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line);background:var(--paper)}.brand{display:flex;align-items:center;gap:14px;font-size:16px;font-weight:650;color:var(--ink);text-decoration:none}.brand-mark{font-family:var(--mono);font-size:22px;letter-spacing:-2px;border-left:3px solid var(--accent);padding:4px 10px;color:var(--accent)}.brand-caption{display:block;font-size:13px;color:var(--muted);font-weight:400;margin-top:5px}.edition{font-size:13px;color:var(--muted)}
.layout{display:grid;grid-template-columns:230px minmax(0,790px) 200px;gap:48px;max-width:1400px;padding:42px 38px 0;margin:auto}.course-nav,.page-nav{position:sticky;top:30px;align-self:start;max-height:calc(100vh - 60px);overflow:auto}.eyebrow{font-size:12px;font-weight:600;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);line-height:1.7;margin:0 0 24px}.module-title{display:flex;gap:12px;font-size:14px;line-height:1.5;margin:26px 0 10px;font-weight:600}.module-title span{font-family:var(--mono);color:#748391;font-weight:400}.course-nav section:first-child .module-title{margin-top:0}.course-nav nav a{display:block;margin-left:25px;padding:11px 12px;border-left:2px solid transparent;font-size:14px;line-height:1.5;text-decoration:none}.course-nav a[aria-current=page]{border-color:var(--accent);background:var(--tint);color:#204e70}.sample-note,.reading-note{font-size:13px;line-height:1.7;color:var(--muted);border-top:1px solid var(--line);margin:32px 0 0;padding-top:20px}.page-nav nav a{display:block;padding:7px 0 7px 12px;border-left:1px solid var(--line);font-size:14px;line-height:1.45;color:var(--muted);text-decoration:none}.page-nav nav a[aria-current=location]{border-color:var(--accent);color:var(--accent);font-weight:600}.page-nav .eyebrow{margin-bottom:14px}
main{min-width:0;padding-bottom:48px}main:focus{outline:none}#lesson-meta{font-size:12px;letter-spacing:.04em;margin:0 0 18px}article{font-size:17px;line-height:1.8}h1{font-size:clamp(30px,3vw,42px);font-weight:650;letter-spacing:-.035em;line-height:1.2;margin:0 0 24px;max-width:700px}h2{font-size:25px;line-height:1.35;letter-spacing:-.02em;font-weight:620;margin:52px 0 18px;scroll-margin-top:28px}h3{font-size:19px;line-height:1.5;margin:28px 0 12px}p{margin:0 0 20px}article>p:first-of-type{font-size:19px;line-height:1.7;color:#52616d}strong{font-weight:650}ul,ol{padding-left:24px;margin:16px 0 24px}li{padding-left:4px;margin:7px 0}blockquote{border-left:3px solid var(--accent);padding:16px 22px;background:var(--tint);margin:28px 0;color:#354b5a;font-size:16px}blockquote p:last-child{margin-bottom:0}code{font-family:var(--mono);font-size:.88em;background:#edf0f3;padding:2px 5px;border-radius:3px}pre{background:#f0f3f6;border:1px solid var(--line);padding:20px;overflow:auto;line-height:1.7;font-size:15px;margin:24px 0}pre code{padding:0;background:none}table{border-collapse:collapse;width:100%;font-size:15px;line-height:1.6}th,td{padding:13px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}th{color:var(--muted);font-weight:600;background:#f0f3f5}td:first-child{min-width:145px}td:last-child{min-width:180px}.table-scroll{overflow-x:auto;margin:24px 0}article img{display:block;width:100%;height:auto;margin:28px 0 10px;background:white;border:1px solid var(--line);border-radius:4px}article p:has(>img)+p>em:only-child{display:block;font-size:14px;color:var(--muted);font-style:normal;line-height:1.6}details{border:1px solid var(--line);background:var(--paper);border-radius:4px;padding:0 20px;margin:24px 0;font-size:16px}summary{cursor:pointer;font-weight:600;padding:16px 0;line-height:1.5;color:#33566f}details[open] summary{border-bottom:1px solid var(--line);margin-bottom:16px}details p:last-child{margin-bottom:20px}details details{margin:12px 0}hr{border:0;border-top:1px solid var(--line);margin:36px 0}.lesson-footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:50px;padding-top:22px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.skip-link{position:fixed;top:-100px;left:16px;background:white;padding:12px;z-index:5}.skip-link:focus{top:12px}.mobile-toc{display:none}
@media(min-width:1600px){.layout{gap:60px;max-width:1480px;grid-template-columns:245px minmax(0,790px) 205px}}
@media(max-width:1180px){.layout{grid-template-columns:200px minmax(0,740px);gap:38px}.page-nav{display:none}.mobile-toc{display:block;margin:0 0 24px;font-size:14px}.mobile-toc a{display:block;margin:10px 0}.mobile-toc nav{padding-bottom:12px}}
@media(max-width:760px){.site-header{padding:17px 20px;min-height:76px}.edition{display:none}.brand{font-size:14px}.brand-caption{font-size:12px}.layout{display:block;padding:26px 20px 0}.course-nav{position:static;max-height:none;border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:28px}.course-nav>.eyebrow,.sample-note,.course-nav section:not(:has(a)){display:none}.course-nav nav a{margin-left:0;padding-left:12px}.module-title{margin:0 0 8px!important}.course-nav section{margin:0}article{font-size:17px}h1{font-size:32px}h2{font-size:24px;margin-top:38px}blockquote{padding:14px 17px}details{padding:0 16px}#lesson-meta{font-size:12px}th,td{padding:11px}article img{margin-top:22px}}
.diagram-scroll{overflow-x:auto}.diagram-scroll img{margin:0;min-width:720px}.diagram-scroll{margin:28px 0 10px}
#course-menu{border:0;padding:0;margin:0;background:transparent}#course-menu>summary{display:none}.nav-module{border:0;background:transparent;padding:0;margin:0 0 18px}.nav-module[open] summary{border:0;margin:0 0 8px}.nav-module summary.module-title{padding:0;margin:0!important;color:var(--ink);display:list-item}.nav-module summary span{margin-right:10px}.nav-module a{margin-left:0!important}.nav-module summary::marker{color:var(--muted);font-size:12px}#lesson-pagination{display:flex;justify-content:space-between;gap:24px;border-top:1px solid var(--line);padding-top:22px;margin-top:45px;font-size:14px;line-height:1.6}#lesson-pagination a{max-width:48%}.lesson-footer{margin-top:25px}.course-nav nav{padding-left:13px}
@media(max-width:760px){#course-menu>summary{display:list-item;padding:0;font-size:15px}#course-menu[open]>summary{margin-bottom:18px}.course-nav{padding-bottom:16px}.course-nav nav{max-height:300px;overflow:auto;padding:0 4px 0 15px}.nav-module summary.module-title{margin-bottom:8px!important}#lesson-pagination{flex-direction:column;gap:15px}#lesson-pagination a{max-width:none}}
@media(max-width:760px){.diagram-scroll img{min-width:720px}.diagram-scroll::before{content:"Схема · можно прокрутить по горизонтали";display:block;font-size:13px;color:var(--muted);margin-bottom:8px}}
@media print{body{background:white}.site-header,.course-nav,.page-nav,.mobile-toc,.lesson-footer,.skip-link{display:none}.layout{display:block;padding:0;max-width:none}main{padding:0}article{font-size:11pt;line-height:1.6}h1{font-size:25pt}h2{font-size:17pt;break-after:avoid}img,pre,tr{break-inside:avoid}details{break-inside:avoid}a{color:inherit}pre{white-space:pre-wrap}.table-scroll,.diagram-scroll{overflow:visible}.diagram-scroll img{min-width:0}.diagram-scroll::before{display:none}}

article .reference-image img{width:auto;max-width:100%;max-height:520px;margin:24px auto 10px;object-fit:contain}