:root{color-scheme:light;--accent:#743ce6;--accent-hover:#6029cd;--ink:#242033;--muted:#756f86;--line:#e7e3ee;--page:#f7f6fa;--sidebar:270px;--header:76px;--code:#211c30}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;background:var(--page);color:var(--ink);font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}button,summary{font:inherit;cursor:pointer}a,button{touch-action:manipulation}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #b695fa;outline-offset:4px}a:hover{color:var(--accent-hover)}.skip{position:fixed;top:-80px;left:20px;padding:10px 20px;background:white;border-radius:8px;z-index:100}.skip:focus{top:12px}.reading-progress{height:3px;position:fixed;inset:0 0 auto;z-index:40;pointer-events:none}.reading-progress span{display:block;width:0;height:100%;background:var(--accent)}.topbar{position:fixed;inset:0 0 auto;height:var(--header);z-index:30;display:flex;align-items:center;gap:20px;padding:0 30px;background:#ffffffef;border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}.brand{display:flex;align-items:center;gap:13px;color:var(--ink);font-size:17px;font-weight:650;letter-spacing:-.025em;line-height:1.3}.brand:hover{color:var(--ink)}.brand-symbol{display:grid;place-items:center;background:var(--accent);color:white;width:38px;height:38px;border-radius:11px;font:700 19px/1 ui-monospace,monospace;box-shadow:0 4px 10px #743ce61a;flex-shrink:0}.brand-divider{padding:0 6px;font-weight:400;color:#bbb3cc}.header-badge{margin-left:auto;font-size:12px;font-weight:600;padding:5px 12px;border:1px solid var(--line);border-radius:20px;color:var(--muted);white-space:nowrap}.menu-button{display:none;align-items:center;justify-content:center;gap:8px;background:white;border:1px solid var(--line);border-radius:10px;padding:8px 11px;font-size:14px;color:var(--ink)}.sidebar{position:fixed;inset:var(--header) auto 0 0;width:var(--sidebar);z-index:25;background:#fcfbfe;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:24px 16px 0}.module-card{border-radius:14px;background:linear-gradient(135deg,#7b42e9,#5830b1);color:white;padding:19px 20px;display:grid;gap:2px;box-shadow:0 6px 16px #6d3bd315;margin-bottom:14px;flex-shrink:0}.module-card-label{font-size:11px;letter-spacing:.1em;font-weight:600;opacity:.72}.module-card strong{font-size:23px;line-height:1.45;letter-spacing:-.025em;font-weight:650}.module-card>span:last-child{font-size:12px;opacity:.85}.sidebar nav{flex:1;overflow-y:auto;margin:0 -4px;padding:0 4px 18px;scrollbar-width:thin;scrollbar-color:#ded7ed transparent}.nav-section{font-size:11px;color:#8b829c;letter-spacing:.1em;text-transform:uppercase;font-weight:700;margin:19px 12px 9px}.sidebar nav a{display:flex;align-items:center;gap:12px;min-height:43px;margin:3px 0;padding:8px 12px;border-radius:9px;color:#696174;font-size:14px;line-height:1.4;transition:background .15s,color .15s}.sidebar nav a:hover{background:#f0eaf9;color:var(--ink)}.sidebar nav a[aria-current]{background:#ece3fc;color:#6231c9;font-weight:650;box-shadow:inset 3px 0 0 var(--accent)}.nav-number{display:grid;place-items:center;width:25px;height:25px;font:12px/1 ui-monospace,SFMono-Regular,Consolas,monospace;color:#9a90ad;border:1px solid #e9e3f0;background:#fff;border-radius:7px;flex-shrink:0}.sidebar a[aria-current] .nav-number{background:#743ce6;color:white;border-color:transparent}.sidebar-source{display:flex;align-items:center;gap:10px;padding:19px 9px;border-top:1px solid var(--line);margin:0 -2px;flex-shrink:0;background:#fcfbfe;font-size:12px;line-height:1.6}.sidebar-source>div{display:grid}.sidebar-source strong{font-size:13px;font-weight:600}.sidebar-source div>span{color:#8c809f;font-size:12px}.avatar{width:34px;height:34px;display:grid;place-items:center;border:1px solid #e3d8f5;background:#efe7fd;color:#8654dc;border-radius:50%;font-size:11px;flex-shrink:0}.workspace{margin-left:var(--sidebar);padding:calc(var(--header) + 36px) 44px 36px;display:grid;grid-template-columns:minmax(0,850px) 204px;gap:40px;justify-content:center;align-items:start}main{min-width:0}.breadcrumb{display:flex;align-items:center;gap:12px;font-size:13px;color:#8b829c;margin-bottom:24px}.breadcrumb a{color:#6f6384}.crumb-separator{color:#c4bbd1}.page-title{margin-bottom:30px}.page-eyebrow{display:flex;align-items:center;gap:12px;color:#8d829f;font-size:12px;line-height:1.5}.page-eyebrow span:first-child{color:#7542c9;background:#eee5fc;padding:5px 10px;border-radius:6px;font-weight:600}.page-title h1{font-size:34px;line-height:1.2;letter-spacing:-.04em;margin:17px 0 0;font-weight:700;max-width:730px}article{background:white;border:1px solid var(--line);border-radius:18px;padding:34px 38px;box-shadow:0 3px 12px #3c275903}.contents{overflow-wrap:break-word;font-size:16px;line-height:1.85;color:#454052}.contents h1{font-size:24px;line-height:1.35;letter-spacing:-.03em;margin:42px 0 21px;color:#2f263e;font-weight:650;padding-bottom:15px;border-bottom:1px solid #eee9f4}.contents h1:first-child{margin-top:0}.contents h2{font-size:21px;line-height:1.4;letter-spacing:-.025em;margin:40px 0 18px;color:#34273f;font-weight:650}.contents h3{font-size:18px;line-height:1.5;margin:30px 0 15px;color:#34273f}.contents p{margin:0 0 18px}.contents strong{color:#332b40;font-weight:650}.contents a{color:var(--accent);text-decoration:underline;text-decoration-color:#d4bbfa;text-underline-offset:3px}.contents ul,.contents ol{margin:16px 0 25px;padding-left:24px}.contents li{padding-left:4px;margin:7px 0}.contents li::marker{color:#9c79d4}.contents blockquote{margin:24px 0;padding:19px 22px;background:#f5f0fe;border:1px solid #e5d8fc;border-left:3px solid var(--accent);border-radius:0 10px 10px 0;color:#665178;font-size:15px}.contents blockquote p:last-child{margin-bottom:0}.contents hr{height:1px;border:0;background:var(--line);margin:28px 0}.contents code{font:14px/1.7 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;border:1px solid #e8def7;border-radius:5px;padding:2px 5px;background:#f5f0fc;color:#743bb5;box-decoration-break:clone;-webkit-box-decoration-break:clone}.contents .code-toolbar{position:relative;background:var(--code);border:1px solid #312841;border-radius:12px;margin:22px 0 26px;padding-top:43px;overflow:hidden;box-shadow:0 5px 13px #211c300b}.contents pre{font:14px/1.85 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;background:var(--code);color:#e7dfef;white-space:pre;overflow:auto;margin:0;padding:19px 22px 22px;tab-size:4;scrollbar-width:thin;scrollbar-color:#56496b transparent}.contents pre code{color:inherit;background:none;border:0;border-radius:0;padding:0;font:inherit;white-space:pre}.toolbar{position:absolute;inset:0 0 auto;height:43px;display:flex;align-items:center;justify-content:space-between;padding:0 14px 0 20px;background:#2a223a;border-bottom:1px solid #3b304b}.code-label{font:11px/1 ui-monospace,monospace;letter-spacing:.03em;color:#afa0c6}.toolbar button{display:flex;align-items:center;gap:7px;background:#ffffff07;border:1px solid #ffffff15;border-radius:6px;color:#d9cde9;font-size:12px;padding:5px 9px;line-height:1.4}.toolbar button:hover{color:white;background:#ffffff10}.toolbar button svg{width:13px;height:13px}.line-numbers-rows,.sf-hidden,.toc-anchor{display:none!important}.token.comment{color:#a194b1}.token.string{color:#bce0a1}.token.keyword{color:#c4a5ff}.token.operator{color:#e5bf91}.contents img{display:block;max-width:100%;height:auto;margin:25px 0 30px;border:1px solid #e1dbe9;border-radius:9px;box-shadow:0 3px 12px #28203307;cursor:zoom-in}.contents table{border-collapse:separate;border-spacing:0;font-size:14px;display:block;max-width:100%;overflow:auto;margin:25px 0;border:1px solid var(--line);border-radius:9px}.contents th,.contents td{padding:11px 14px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);text-align:left}.contents tr:last-child td{border-bottom:0}.contents th{background:#f5f1fb;color:#5d407e;font-weight:600}.contents .diagram{max-width:100%;overflow:auto;background:#fff;padding:18px 10px;border:1px solid var(--line);border-radius:12px;margin:26px 0;scrollbar-width:thin}.contents .diagram svg{display:block;margin:auto;max-width:none}.toc{position:sticky;top:calc(var(--header) + 34px);padding-top:5px;max-height:calc(100vh - var(--header) - 60px);overflow:auto;scrollbar-width:thin}.toc-label{color:#5f526e;font-size:12px;font-weight:650;margin-bottom:19px}.toc nav{display:grid;border-left:1px solid #ded7e8}.toc nav a{font-size:13px;color:#92849f;line-height:1.55;padding:7px 0 7px 17px;margin-left:-1px;border-left:2px solid transparent;transition:color .15s}.toc nav a:hover{color:#6533b8}.toc nav a.active{color:var(--accent);border-left-color:var(--accent);font-weight:600}.toc-h2,.toc-h3{font-size:12px!important}.toc-rule{width:28px;height:1px;background:#d9d0e5;margin:25px 0 14px}.toc-note{font-size:11px;color:#9a8ba7}.mobile-toc{display:none}.pagination{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:24px}.pagination a{display:grid;gap:7px;align-content:center;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 22px;color:#51455f;transition:border-color .15s,background .15s}.pagination a:hover{border-color:#ccb4f1;background:#fcfaff}.pagination small{font-size:11px;color:#9b8ba9}.pagination strong{font-size:14px;font-weight:600;line-height:1.5}.pagination a:last-child{text-align:right}footer{display:flex;justify-content:space-between;gap:20px;padding:24px 3px 0;font-size:11px;color:#a294ae}footer a{color:#94819f}.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#30223f;color:#fff;box-shadow:0 8px 30px #36214930;padding:11px 19px;border-radius:10px;font-size:14px;z-index:100;display:none}.toast.visible{display:block}.menu-backdrop{display:none}.image-dialog{border:0;border-radius:15px;padding:50px 22px 22px;max-width:calc(100vw - 40px);max-height:calc(100vh - 40px);background:#fff;box-shadow:0 15px 80px #0004}.image-dialog::backdrop{background:#160e25c9;backdrop-filter:blur(5px)}.image-dialog img{display:block;max-width:100%;max-height:calc(100vh - 130px);object-fit:contain;margin:auto}.image-close{position:absolute;top:12px;right:16px;border:0;background:#f3eff9;color:#6a527e;border-radius:7px;padding:5px 12px;font-size:12px}.image-close span{font-size:18px;margin-left:6px}.menu-open{overflow:hidden}@media(min-width:1600px){.workspace{gap:52px;padding-left:64px;padding-right:64px}}@media(max-width:1279px){.workspace{grid-template-columns:minmax(0,850px);padding:calc(var(--header) + 32px) 34px 30px}.toc{display:none}.mobile-toc{display:block;background:#f0eafa;border:1px solid #e4d9f1;border-radius:10px;margin:0 0 20px;color:#7c6396;font-size:13px;padding:12px 16px}.mobile-toc summary{font-weight:600}.mobile-toc nav{display:grid;gap:7px;margin-top:14px}.mobile-toc nav a{color:#816594;font-size:13px;line-height:1.5;padding:2px 0}}@media(max-width:1023px){:root{--header:68px}.menu-button{display:flex}.topbar{padding:0 22px;gap:16px}.brand-symbol{display:none}.brand{font-size:16px;min-width:0}.sidebar{transform:translateX(-100%);transition:transform .2s;box-shadow:10px 0 30px #25143b10}.sidebar.open{transform:translateX(0)}.workspace{margin-left:0;padding-left:32px;padding-right:32px}.menu-backdrop:not([hidden]){display:block;position:fixed;inset:var(--header) 0 0;background:#1e123b45;backdrop-filter:blur(3px);z-index:24;border:0}.page-title h1{font-size:32px}.module-card{padding:18px 19px}.sidebar{padding-top:18px}}@media(max-width:599px){.topbar{padding:0 16px;gap:12px}.menu-button{padding:9px;flex-shrink:0}.menu-button span{display:none}.brand{font-size:14px;line-height:1.35;max-width:285px}.brand-divider{padding:0 2px}.header-badge{display:none}.workspace{padding:calc(var(--header) + 23px) 16px 26px}.breadcrumb{font-size:12px;gap:9px;margin-bottom:22px}.page-title{margin-bottom:22px}.page-title h1{font-size:28px;line-height:1.24;letter-spacing:-.035em}.page-eyebrow{gap:9px;font-size:11px}.page-eyebrow span:first-child{padding:4px 8px}article{padding:24px 20px;border-radius:14px}.contents{font-size:16px;line-height:1.8}.contents h1{font-size:23px;line-height:1.35;margin-top:35px}.contents h2{font-size:20px;line-height:1.4;margin-top:34px}.contents ul,.contents ol{padding-left:20px}.contents blockquote{padding:16px;font-size:14px}.contents .code-toolbar{margin-left:-7px;margin-right:-7px;border-radius:9px}.contents pre{padding:17px 15px 20px;font-size:13px}.toolbar{padding-left:15px}.toolbar button{font-size:11px}.contents img{border-radius:6px;margin:23px 0}.pagination{gap:10px}.pagination a{padding:15px 14px;border-radius:10px}.pagination strong{font-size:12px}.pagination small{font-size:10px}footer{font-size:10px;gap:8px;flex-wrap:wrap}.toast{bottom:20px;width:max-content;max-width:calc(100vw - 30px);font-size:13px}.image-dialog{max-width:calc(100vw - 20px);padding:48px 10px 14px}.mobile-toc{margin-bottom:16px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}@media print{body{background:#fff}.topbar,.sidebar,.toc,.pagination,.breadcrumb,.toolbar,.toast,.mobile-toc,.reading-progress{display:none!important}.workspace{margin:0;padding:0;display:block}article{border:0;padding:0;box-shadow:none}.contents pre{white-space:pre-wrap;background:#f5f5f5;color:black}.contents pre code{color:black}.contents .code-toolbar{padding:0;background:white;border:1px solid #ddd}.contents img{break-inside:avoid;box-shadow:none}.page-title{margin:0 0 20px}a{color:inherit}}

.contact-footer{margin-top:28px;padding:25px 26px 27px;background:#fff;border:1px solid var(--line);border-radius:15px;box-shadow:0 3px 12px #3c275903}.contact-heading{display:flex;align-items:center;gap:13px;margin-bottom:20px}.contact-monogram{display:grid;place-items:center;flex-shrink:0;width:40px;height:40px;color:#8853d5;background:#f0e7fe;border:1px solid #e4d4fb;border-radius:12px;font-size:12px;font-weight:650}.contact-heading h2{font-size:17px;font-weight:650;letter-spacing:-.02em;line-height:1.4;margin:0;color:#362842}.contact-heading p{font-size:12px;margin:3px 0 0;color:#9a85ad}.social-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:11px}.social-link{display:flex;align-items:center;justify-content:center;gap:9px;min-height:46px;padding:10px 13px;background:#fcfaff;color:#6f4a92;border:1px solid #e6ddf1;border-radius:9px;font-size:13px;font-weight:600;line-height:1.4;transition:background .15s,border-color .15s,box-shadow .15s}.social-link svg{width:18px;height:18px;flex-shrink:0}.social-link:hover{background:#f1e7fe;border-color:#c8a4f3;color:#6630b5;box-shadow:0 3px 10px #743ce610}.social-link-primary{background:var(--accent);border-color:var(--accent);color:#fff}.social-link-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);color:#fff}.social-link[disabled]{cursor:default;opacity:.6}@media(max-width:599px){.contact-footer{padding:21px 20px;border-radius:12px}.social-links{grid-template-columns:1fr;gap:9px}.contact-heading{margin-bottom:17px}.social-link{justify-content:flex-start;padding:11px 16px;font-size:14px}.contact-heading h2{font-size:16px}}@media print{.contact-footer{display:none}}

.site-footer{display:block;padding:0}.source-row{display:flex;justify-content:space-between;gap:16px;padding:22px 3px 0}@media(max-width:599px){.source-row{flex-wrap:wrap;gap:9px}}

.header-badge{display:block;flex-shrink:0}@media(max-width:1023px){.brand{flex-shrink:1}}@media(max-width:599px){.header-badge{font-size:clamp(10px,2.85vw,12px);padding:5px 9px}}
/* Reading tools and catalogue */
:root{--surface:#fff;--surface-soft:#fcfbfe;--soft:#f0eafa;--shadow:0 6px 24px #30204009}
.reader-tools{display:flex;gap:10px;align-items:center;margin:0 0 20px;flex-wrap:wrap}.tool-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:9px;padding:9px 13px;font-size:13px;line-height:1.5}.tool-button:hover{border-color:var(--accent);color:var(--accent)}.search-open{flex:1;justify-content:flex-start;min-width:175px}.tool-button kbd{margin-left:auto;color:var(--muted);font:10px/1.4 inherit;border:1px solid var(--line);border-radius:4px;padding:2px 5px}.task-state{display:flex;gap:12px;justify-content:space-between;align-items:center;padding:13px 16px;margin:0 0 20px;background:var(--surface);border:1px solid var(--line);border-radius:10px;font-size:14px}.task-state label{display:flex;align-items:center;gap:9px;font-weight:600;cursor:pointer}.task-state input{width:18px;height:18px;accent-color:var(--accent);flex-shrink:0}.task-state>span{font-size:11px;color:var(--muted)}.sidebar .is-complete .nav-number{background:#e7f5ed;color:#246642;border-color:#bfdec9}.sidebar .is-complete .nav-name::after{content:' ✓';color:#28784a}.resume-banner{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin-bottom:20px;display:flex;gap:14px;align-items:center;justify-content:space-between}.resume-banner strong{display:block;font-size:14px}.resume-banner p{margin:3px 0 0;font-size:12px;color:var(--muted)}.resume-banner .tool-button{flex-shrink:0}.section-share{margin-left:10px;padding:3px 7px;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--muted);vertical-align:middle;font-size:12px;line-height:1.5;min-width:28px}.section-share:hover{color:var(--accent);border-color:var(--accent)}
.search-dialog{color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:24px;width:720px;max-width:calc(100vw - 32px);max-height:calc(100dvh - 60px);box-shadow:0 20px 100px #0003;overflow:auto}.search-dialog::backdrop{background:#1a1027aa;backdrop-filter:blur(4px)}.search-header{display:flex;gap:12px;justify-content:space-between;align-items:center;margin-bottom:17px}.search-header h2{font-size:21px;margin:0;letter-spacing:-.025em}.search-dialog label{display:block;font-size:12px;color:var(--muted);margin-bottom:8px}.search-dialog input{width:100%;font:16px/1.5 inherit;color:var(--ink);background:var(--page);padding:12px 14px;border:1px solid var(--line);border-radius:10px;outline-offset:2px}.search-dialog input:focus{outline:2px solid var(--accent)}.search-status{font-size:12px;color:var(--muted);margin:14px 0}.search-results{display:grid;gap:10px}.search-result{display:block;padding:13px 15px;background:var(--page);border:1px solid var(--line);border-radius:10px;color:var(--ink)}.search-result:hover{border-color:var(--accent);color:var(--ink)}.search-result strong{display:block;font-size:14px}.search-result small{display:block;color:var(--accent);font-size:12px;margin:3px 0}.search-result p{font-size:13px;line-height:1.6;color:var(--muted);margin:6px 0 0;overflow-wrap:anywhere}.search-result mark{background:#e6d6ff;color:#52258d;border-radius:2px}.home-workspace{grid-template-columns:minmax(0,1080px)}.home-title h1{font-size:46px;line-height:1.1;max-width:850px}.home-title>p{color:var(--muted);font-size:17px;line-height:1.65;margin:18px 0 0}.module-overview{display:grid;grid-template-columns:1.3fr 1fr;gap:24px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:26px 28px;margin:24px 0 16px}.module-kicker{font-size:11px;letter-spacing:.12em;color:var(--accent);font-weight:700}.module-overview h2{margin:9px 0;font-size:24px;line-height:1.35;letter-spacing:-.025em}.module-overview p{color:var(--muted);font-size:13px;margin:0}.course-progress{display:grid;gap:10px}.course-progress strong{font-size:14px}.course-progress small{font-size:11px;color:var(--muted)}.completion-progress{width:100%;height:7px;border:0;border-radius:8px;overflow:hidden;accent-color:var(--accent)}progress::-webkit-progress-bar{background:var(--soft)}progress::-webkit-progress-value{background:var(--accent);border-radius:8px}progress::-moz-progress-bar{background:var(--accent)}.start-links{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:24px}.start-links a{padding:13px 18px;border:1px solid var(--line);border-radius:10px;background:var(--soft);font-size:13px;font-weight:600;display:flex;justify-content:space-between}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.lesson-card{display:flex;flex-direction:column;align-items:flex-start;background:var(--surface);color:var(--ink);padding:23px 24px;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);transition:border-color .15s,transform .15s}.lesson-card:hover{border-color:var(--accent);color:var(--ink);transform:translateY(-2px)}.card-top{display:flex;align-items:center;justify-content:space-between;gap:10px;width:100%}.card-number{font-size:11px;font-weight:600;color:var(--muted)}.card-status{font-size:10px;line-height:1.5;padding:3px 8px;border:1px solid var(--line);border-radius:20px;color:var(--muted)}.lesson-card.is-complete .card-status{color:#246642;background:#e7f5ed;border-color:#bfdec9}.lesson-card h3{font-size:20px;letter-spacing:-.025em;line-height:1.35;margin:16px 0 10px}.lesson-card p{font-size:13px;color:var(--muted);line-height:1.7;margin:0 0 20px}.card-link{display:flex;gap:15px;justify-content:space-between;width:100%;font-size:12px;font-weight:600;color:var(--accent);margin-top:auto}.future-modules{color:var(--muted);font-size:12px;margin:25px 0 0}
html[data-theme=dark]{color-scheme:dark;--accent:#b996ff;--accent-hover:#d0baff;--ink:#eee9f5;--muted:#aaa0ba;--line:#373043;--page:#17131f;--surface:#211c2a;--surface-soft:#1d1826;--soft:#2d233e;--code:#120f19;--shadow:0 6px 24px #0001}html[data-theme=dark] .topbar{background:#211c2aef}html[data-theme=dark] :is(.sidebar,.sidebar-source){background:var(--surface-soft)}html[data-theme=dark] :is(article,.pagination a,.contact-footer,.menu-button,.nav-number,.image-dialog,.skip){background:var(--surface)}html[data-theme=dark] :is(.contents,.contents strong,.contents h1,.contents h2,.contents h3,.contact-heading h2,.pagination a,.toc-label){color:var(--ink)}html[data-theme=dark] :is(.sidebar nav a,.breadcrumb,.breadcrumb a,.page-eyebrow,.toc nav a,.toc-note,.nav-section,.source-row,.source-row a,.sidebar-source div>span,.contact-heading p,.pagination small){color:var(--muted)}html[data-theme=dark] :is(.sidebar nav a:hover,.sidebar nav a[aria-current],.mobile-toc,.contents blockquote,.page-eyebrow span:first-child,.avatar,.contact-monogram,.social-link,.image-close){background:var(--soft);color:var(--accent);border-color:var(--line)}html[data-theme=dark] .contents code{background:#31243e;color:#d3adff;border-color:#483354}html[data-theme=dark] .contents pre code{background:none;color:inherit;border:0}html[data-theme=dark] .contents h1{border-color:var(--line)}html[data-theme=dark] .contents th{background:var(--soft);color:var(--ink)}html[data-theme=dark] .toc nav{border-color:var(--line)}html[data-theme=dark] :is(.contents img,.nav-number){border-color:var(--line)}html[data-theme=dark] .contents .diagram{background:#fff;color:#242033}html[data-theme=dark] .pagination a:hover{background:var(--soft)}html[data-theme=dark] .brand-symbol{color:#21132f}html[data-theme=dark] .is-complete .card-status,html[data-theme=dark] .sidebar .is-complete .nav-number{background:#193326;color:#9ed5b0;border-color:#375846}html[data-theme=dark] .sidebar .is-complete .nav-name::after{color:#9ed5b0}html[data-theme=dark] .search-result mark{background:#523275;color:#f4e8ff}
@media(max-width:599px){.reader-tools{gap:8px}.tool-button{padding:9px 11px}.tool-button kbd{display:none}.task-state{flex-wrap:wrap;gap:4px}.task-state>span{padding-left:27px}.resume-banner{align-items:flex-start;flex-direction:column;gap:10px}.resume-banner .tool-button{width:100%}.search-dialog{padding:18px;max-height:calc(100dvh - 32px)}.search-header h2{font-size:18px}.search-close{font-size:11px}.home-title h1{font-size:34px}.home-title>p{font-size:15px}.module-overview{grid-template-columns:1fr;gap:21px;padding:22px}.module-overview h2{font-size:23px}.lesson-grid{grid-template-columns:1fr;gap:12px}.lesson-card{padding:21px}.start-links{grid-template-columns:1fr;gap:9px}.breadcrumb{flex-wrap:wrap}.section-share{margin-left:7px}}
@media print{.reader-tools,.task-state,.resume-slot,.section-share,.search-dialog{display:none!important}html[data-theme=dark]{--ink:#242033;--page:#fff;--surface:#fff;--line:#ddd;color-scheme:light}html[data-theme=dark] :is(.contents,.contents strong,.contents h1,.contents h2,.contents h3){color:#222}}

/* Module selection and catalogue spacing. */
.module-switcher{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;margin-bottom:12px;flex-shrink:0}.module-switcher a{display:flex;align-items:center;justify-content:center;min-width:0;width:100%;height:34px;padding:0 4px;text-align:center;font-size:12px;font-weight:600;line-height:1;white-space:nowrap;border:1px solid var(--line);border-radius:8px;color:var(--muted);background:var(--surface)}.module-switcher a:hover,.module-switcher a[aria-current]{color:var(--accent);border-color:var(--accent);background:var(--soft)}.home-page .lesson-grid+.module-overview{margin-top:48px}.breadcrumb{flex-wrap:wrap}@media print{.module-switcher{display:none}}

/* Compact module cards on the homepage. */
+.home-page .module-overview+.module-overview{margin-top:16px}.module-action{display:grid;gap:16px;min-width:0}.module-study{display:inline-flex;align-items:center;justify-content:center;gap:18px;justify-self:start;padding:10px 17px;background:linear-gradient(135deg,#7b42e9,#5830b1);color:#fff;border:1px solid transparent;border-radius:9px;font-size:13px;font-weight:600;line-height:1.6;transition:filter .15s}.module-study:hover{filter:brightness(.94);color:#fff}@media(max-width:599px){.module-study{justify-self:stretch}}

/* Theme control stays in the header while reading. */
.header-actions{margin-left:auto;display:flex;align-items:center;gap:12px;flex-shrink:0}.header-actions .header-badge{margin-left:0}.topbar .theme-toggle{flex-shrink:0;min-height:38px}.theme-toggle svg{width:18px;height:18px;flex-shrink:0}.theme-toggle .theme-sun{display:none}html[data-theme=dark] .theme-toggle .theme-moon{display:none}html[data-theme=dark] .theme-toggle .theme-sun{display:block}
@media(max-width:599px){.topbar{padding:0 12px;gap:8px}.topbar .brand{flex:1;min-width:0;font-size:13px}.header-actions{gap:6px}.header-actions .header-badge{font-size:10px;padding:5px 6px}.topbar .theme-toggle{width:38px;height:38px;padding:9px}.topbar .theme-label{display:none}}

/* Keep manual search available in the fixed header. */
.topbar .header-search{flex:0 1 auto;min-width:0;min-height:38px;gap:10px}.header-search svg{width:18px;height:18px;flex-shrink:0}.header-search .search-label{white-space:nowrap}.header-search kbd{margin-left:12px}
@media(max-width:899px){.header-search kbd{display:none}}
@media(max-width:799px){.topbar .header-search{width:38px;height:38px;padding:9px;justify-content:center}.header-search .search-label{display:none}}

/* Motion follows the existing violet palette without changing layout or tab sizes. */
:root{--motion-ease:cubic-bezier(.22,1,.36,1)}
@media(prefers-reduced-motion:no-preference){
 .motion-enabled .motion-pending{opacity:0;translate:0 16px}
 .motion-enabled .motion-revealed{animation:pgk-reveal 620ms var(--motion-ease) var(--reveal-delay,0ms) both}
 .motion-enabled .topbar{animation:pgk-header 500ms var(--motion-ease) both}
 .motion-enabled .brand-symbol{transition:transform 360ms var(--motion-ease),box-shadow 360ms}
 .motion-enabled .module-card{background-size:160% 160%;animation:pgk-gradient 1400ms var(--motion-ease) both}
 .motion-enabled :is(.tool-button,.module-switcher a,.menu-button,.social-link,.pagination a,.module-study,.section-share,.toolbar button,.search-result){transition:transform 250ms var(--motion-ease),background-color 250ms,border-color 250ms,color 250ms,box-shadow 250ms,filter 250ms}
 .motion-enabled .module-study{position:relative;overflow:hidden;isolation:isolate}
 .motion-enabled .module-study::before{content:'';position:absolute;inset:-50% -25%;background:linear-gradient(110deg,transparent 35%,#ffffff22 49%,transparent 63%);transform:translateX(-110%);pointer-events:none;z-index:-1}
 .motion-enabled .module-study:is(:hover,:focus-visible)::before{animation:pgk-sheen 850ms var(--motion-ease)}
 .motion-enabled .module-study span{transition:transform 300ms var(--motion-ease)}
 .motion-enabled .module-overview{transition:border-color 300ms,box-shadow 300ms}
 .motion-enabled .sidebar nav a{transition:background-color 230ms,color 230ms,translate 260ms var(--motion-ease)}
 .motion-enabled .nav-number{transition:background-color 250ms,color 250ms,transform 300ms var(--motion-ease)}
 .motion-enabled .contents :is(.code-toolbar,img){transition:box-shadow 300ms,border-color 300ms,transform 350ms var(--motion-ease)}
 .motion-enabled .reading-progress span{transition:width 120ms linear}
 .motion-enabled .search-dialog[open]:not([data-closing]),.motion-enabled .image-dialog[open]:not([data-closing]){animation:pgk-dialog 380ms var(--motion-ease) both}
 .motion-enabled dialog[open]::backdrop{animation:pgk-fade 260ms ease both}
 .motion-enabled dialog[data-closing]::backdrop{animation:pgk-fade 180ms ease reverse both}
 .motion-enabled .search-result{animation:pgk-reveal 400ms var(--motion-ease) var(--result-delay,0ms) both}
 .motion-enabled .mobile-toc[open] nav{animation:pgk-reveal 330ms var(--motion-ease) both}
 .motion-enabled .menu-button svg{transition:transform 350ms var(--motion-ease)}
 .motion-enabled .menu-button[aria-expanded=true] svg{transform:rotate(90deg)}
 .motion-enabled .contents :is(h1,h2,h3):target{animation:pgk-anchor 1000ms ease}
 .motion-enabled :is(.tool-button,.module-study,.social-link,.module-switcher a,.toolbar button):active{transform:scale(.97)}
 .theme-changing body,.theme-changing :is(.topbar,.sidebar,.sidebar-source,article,.module-overview,.contact-footer,.tool-button,.mobile-toc,.task-state,.nav-number,.pagination a,.contents code,.contents th){transition:background-color 450ms ease,color 450ms ease,border-color 450ms ease}
 @media(hover:hover) and (pointer:fine){
  .motion-enabled :is(.tool-button,.module-switcher a,.social-link,.pagination a,.module-study):hover{transform:translateY(-2px);box-shadow:0 6px 18px #743ce618}
  .motion-enabled .module-overview:hover{border-color:var(--accent);box-shadow:0 10px 30px #743ce612}
  .motion-enabled .module-study:hover span{transform:translate(3px,-3px)}
  .motion-enabled .sidebar nav a:hover{translate:3px 0}
  .motion-enabled .sidebar nav a:hover .nav-number{transform:scale(1.07)}
  .motion-enabled .brand:hover .brand-symbol{transform:rotate(-6deg) scale(1.04);box-shadow:0 6px 20px #743ce633}
  .motion-enabled .contents .code-toolbar:hover{border-color:#8f67c0;box-shadow:0 8px 24px #743ce618}
  .motion-enabled .contents img:hover{transform:scale(1.006);border-color:var(--accent);box-shadow:0 8px 28px #743ce618}
 }
 @media(max-width:1023px){
  .motion-enabled .sidebar{transition:transform 420ms var(--motion-ease)}
  .motion-enabled .sidebar.open :is(.module-switcher,.module-card){animation:pgk-nav 420ms var(--motion-ease) 70ms both}
  .motion-enabled .sidebar.open nav a{animation:pgk-nav 380ms var(--motion-ease) calc(100ms + var(--nav-delay,0ms)) both}
 }
}
/* Toasts retain their position while fading in and out. */
.toast{display:block;opacity:0;visibility:hidden;pointer-events:none;translate:0 8px;transition:opacity 200ms ease,translate 250ms var(--motion-ease),visibility 200ms}
.toast.visible{opacity:1;visibility:visible;translate:0 0}
@keyframes pgk-reveal{from{opacity:0;translate:0 16px}to{opacity:1;translate:0 0}}
@keyframes pgk-nav{from{opacity:0;transform:translateX(-8px)}to{opacity:1;transform:none}}
@keyframes pgk-header{from{opacity:0;translate:0 -8px}to{opacity:1;translate:0 0}}
@keyframes pgk-dialog{from{opacity:0;transform:translateY(18px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}
@keyframes pgk-fade{from{opacity:0}to{opacity:1}}
@keyframes pgk-gradient{from{background-position:0% 0%}to{background-position:100% 100%}}
@keyframes pgk-sheen{to{transform:translateX(110%)}}
@keyframes pgk-anchor{0%,100%{background:transparent}35%{background:var(--soft)}}
@media(prefers-reduced-motion:reduce){.motion-pending{opacity:1!important;translate:none!important}.toast{translate:none}}
@media print{.motion-pending,.motion-revealed{opacity:1!important;translate:none!important;animation:none!important}.toast{display:none!important}}

/* Granular article reveals: text, list rows and frames keep independent timing. */
@media(prefers-reduced-motion:no-preference){
 .motion-enabled :is(.motion-container,.motion-inline).motion-pending{translate:none}
 .motion-enabled :is(.motion-container,.motion-inline).motion-revealed{animation-name:pgk-fade;animation-duration:440ms;animation-delay:var(--reveal-delay,0ms)}
 .motion-enabled .motion-instant{animation:none!important;opacity:1;translate:none}
}

/* Focus reading keeps the article centred and its controls within reach. */
:root{--reader-scale:1;--focus-tools-height:58px}
.focus-toggle svg{width:18px;height:18px;flex-shrink:0}
.topbar .focus-toggle{min-height:38px;white-space:nowrap}
.focus-toggle[aria-pressed=true]{background:var(--soft);border-color:var(--accent);color:var(--accent)}
.focus-toolbar{position:fixed;inset:var(--header) 0 auto;z-index:29;height:var(--focus-tools-height);background:var(--surface);border-bottom:1px solid var(--line)}
.focus-toolbar[hidden]{display:none}
.focus-toolbar-inner{height:100%;max-width:850px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:0 8px}
.focus-caption{font-size:13px;color:var(--muted)}
.reader-size-controls{display:flex;align-items:center;gap:6px}
.reader-size-controls .tool-button{height:36px;min-width:38px;padding:6px 10px;font-size:15px;line-height:1}
.reader-size-controls .reader-reset{min-width:64px;font-size:12px;font-variant-numeric:tabular-nums}
.reader-size-controls button:disabled{opacity:.38;cursor:default;transform:none;box-shadow:none}
html.focus-mode{scroll-padding-top:calc(var(--header) + var(--focus-tools-height) + 24px)}
.focus-mode :is(.sidebar,.toc,.mobile-toc,.menu-button,.menu-backdrop,.site-footer){display:none!important}
.focus-mode .workspace{margin-left:0;grid-template-columns:minmax(0,850px);gap:0;padding:calc(var(--header) + var(--focus-tools-height) + 32px) 32px 36px}
.focus-mode .contents{font-size:calc(16px * var(--reader-scale))}
.focus-mode .contents h1{font-size:calc(24px * var(--reader-scale))}
.focus-mode .contents h2{font-size:calc(21px * var(--reader-scale))}
.focus-mode .contents h3{font-size:calc(18px * var(--reader-scale))}
.focus-mode .contents blockquote{font-size:calc(15px * var(--reader-scale))}
.focus-mode .contents :is(code,pre,table){font-size:calc(14px * var(--reader-scale))}
.focus-mode .contents pre code{font-size:inherit}
@media(max-width:899px){.topbar .focus-toggle{width:38px;height:38px;padding:9px}.focus-label{display:none}}
@media(max-width:919px){.focus-toolbar-inner{padding:0 32px}}
@media(max-width:599px){
 .focus-mode .workspace{padding:calc(var(--header) + var(--focus-tools-height) + 23px) 16px 26px}
 .focus-toolbar-inner{padding:0 16px}
 .focus-mode .contents{padding:24px 20px}
 .focus-mode .contents h1{font-size:calc(23px * var(--reader-scale))}
 .focus-mode .contents h2{font-size:calc(20px * var(--reader-scale))}
 .focus-mode .contents blockquote{font-size:calc(14px * var(--reader-scale))}
 .focus-mode .contents pre{font-size:calc(13px * var(--reader-scale))}
}
@media(prefers-reduced-motion:no-preference){.motion-enabled.focus-mode .focus-toolbar{animation:pgk-fade 240ms ease both}}
@media print{.focus-toolbar{display:none!important}.focus-mode .workspace{margin:0;padding:0;display:block}}

/* Smiling terminal mark: preserve the existing brand tile. */
.brand-symbol .brand-logo{display:block;width:100%;height:100%;flex-shrink:0;overflow:visible}

/* A short introduction credits the original manual and its author. */
body.welcome-open{overflow:hidden}
.welcome-dialog{color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:0;width:600px;max-width:calc(100vw - 32px);max-height:calc(100dvh - 40px);overflow:hidden;box-shadow:0 30px 120px #0005}
.welcome-dialog[open]{display:flex;flex-direction:column}
.welcome-dialog::backdrop{background:#120d20ad;backdrop-filter:blur(8px)}
.welcome-content{overflow:auto;min-height:0;padding:30px;scrollbar-width:thin;scrollbar-color:var(--line) transparent}
.welcome-brand{display:flex;align-items:center;gap:12px;margin-bottom:23px;padding-right:30px;color:var(--muted);font-size:13px;font-weight:650;line-height:1.4}
.welcome-mark{display:grid;place-items:center;width:48px;height:48px;border-radius:14px;background:var(--accent);color:#fff;flex-shrink:0}
.welcome-mark svg{display:block;width:100%;height:100%}
html[data-theme=dark] .welcome-mark{color:#21132f}
.welcome-close{position:absolute;right:16px;top:16px;z-index:1;width:34px;height:34px;padding:8px;background:var(--surface);border-color:transparent;color:var(--muted)}
.welcome-close svg{width:18px;height:18px}
.welcome-dialog h2{margin:0 0 14px;font-size:28px;line-height:1.2;letter-spacing:-.035em;max-width:450px}
.welcome-dialog h2:focus{outline:none}
.welcome-dialog p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}
.welcome-credit{margin-top:23px;padding:19px 20px;background:var(--soft);border:1px solid var(--line);border-radius:14px}
.welcome-eyebrow{display:block;color:var(--muted);font-size:10px;line-height:1.5;letter-spacing:.09em;text-transform:uppercase;font-weight:700}
.welcome-credit h3{margin:7px 0 10px;font-size:18px;line-height:1.35;letter-spacing:-.02em}
.welcome-credit h3 a{color:var(--accent)}
.welcome-credit h3 a:hover{text-decoration:underline;text-underline-offset:4px}
.welcome-credit .welcome-thanks{margin-top:12px;color:var(--ink);font-size:13px;font-weight:550}
.welcome-contacts{margin-top:22px}
.welcome-contacts .social-links{margin-top:9px}
.welcome-contacts .social-link{min-height:42px;font-size:12px;justify-content:center;padding:9px 10px}
.welcome-actions{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 30px;border-top:1px solid var(--line);background:var(--surface);flex-shrink:0}
.welcome-preference{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:11px;line-height:1.4;cursor:pointer}
.welcome-preference input{width:15px;height:15px;margin:0;accent-color:var(--accent);flex-shrink:0}
.welcome-start{display:inline-flex;align-items:center;justify-content:center;gap:10px;border:0;border-radius:10px;padding:12px 17px;color:#fff;background:linear-gradient(135deg,#7b42e9,#5830b1);font-size:13px;font-weight:650;line-height:1.4;white-space:nowrap}
.welcome-start:hover{filter:brightness(1.08)}
.welcome-reopen{padding:0;border:0;background:none;color:var(--accent);font:inherit;cursor:pointer;white-space:nowrap}
.welcome-reopen:hover{text-decoration:underline;text-underline-offset:3px}
@media(max-width:599px){
 .welcome-dialog{border-radius:19px;max-width:calc(100vw - 24px);max-height:calc(100dvh - 24px)}
 .welcome-content{padding:18px 16px}
 .welcome-brand{margin-bottom:12px;gap:9px;font-size:11px;padding-right:30px}
 .welcome-mark{width:32px;height:32px;border-radius:9px}
 .welcome-close{top:12px;right:12px}
 .welcome-dialog h2{font-size:23px;margin-bottom:12px;max-width:300px}
 .welcome-dialog p{font-size:13px;line-height:1.5}
 .welcome-credit{padding:12px 14px;margin-top:18px;border-radius:12px}
 .welcome-credit .welcome-eyebrow{display:none}
 .welcome-contacts>.welcome-eyebrow{margin-bottom:7px}
 .welcome-credit h3{font-size:16px;margin:0 0 10px}
 .welcome-credit .welcome-thanks{margin-top:14px;font-size:12px}
 .welcome-contacts{margin-top:18px}
 .welcome-contacts .social-links{margin-top:0;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}
 .welcome-contacts .social-link{min-height:42px;font-size:11px;gap:5px;padding:9px 4px}
 .welcome-contacts .social-link svg{width:14px;height:14px}
 .welcome-actions{padding:12px 16px;flex-direction:column-reverse;gap:9px;align-items:stretch}
 .welcome-start{width:100%;min-height:42px;padding:10px 14px}
 .welcome-preference{justify-content:center;font-size:11px}
}
@media(max-width:599px) and (max-height:700px){
 .welcome-dialog{max-width:calc(100vw - 16px);max-height:calc(100dvh - 16px)}
 .welcome-content{padding:14px}
 .welcome-brand{margin-bottom:10px}
 .welcome-mark{width:28px;height:28px;border-radius:8px}
 .welcome-dialog h2{font-size:21px;margin-bottom:10px}
 .welcome-dialog p{font-size:12px;line-height:1.45}
 .welcome-credit{margin-top:14px;padding:10px 12px}
 .welcome-credit h3{font-size:15px;margin-bottom:8px}
 .welcome-credit .welcome-thanks{font-size:12px;margin-top:12px}
 .welcome-contacts{margin-top:14px}
 .welcome-actions{padding:10px 14px;gap:8px}
}
@media(max-width:359px) and (max-height:700px){
 .welcome-content{padding:12px;scrollbar-width:none}
 .welcome-mark{width:24px;height:24px;border-radius:7px}
 .welcome-dialog h2{font-size:20px}
 .welcome-dialog p{line-height:1.4}
 .welcome-credit{padding:8px 10px}
 .welcome-actions{padding:8px 12px}
}
@media(prefers-reduced-motion:no-preference){
 .motion-enabled .welcome-dialog[open]:not([data-closing]){animation:pgk-dialog 380ms var(--motion-ease) both}
 .motion-enabled .welcome-start{transition:transform 250ms var(--motion-ease),filter 250ms}
 .motion-enabled .welcome-start:active{transform:scale(.97)}
}
@media print{.welcome-dialog,.welcome-reopen{display:none!important}body.welcome-open{overflow:visible}}