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sans-serif;--radius:4px;--radius-panel:6px;--control-height:36px;--nav-item-height:34px;--sidebar-width:270px;--mobile-bar-height:57px}h1,h2,h3,h4{color:var(--text);letter-spacing:0;font-weight:600;line-height:1.2}h1{letter-spacing:.03em;text-transform:uppercase;overflow-wrap:break-word;max-width:30ch;margin:8px 0 14px;font-size:clamp(1.9rem,2.5vw,2.3rem);font-weight:700;line-height:1.15}h2{margin:0 0 16px;font-size:1.6rem}h3{margin:0 0 12px;font-size:1.3rem}h4{font-size:1.1rem}strong{color:var(--text);font-weight:600}button strong{color:inherit}a{color:var(--gold)}.course-main p,.course-main li{line-height:1.65}.eyebrow,.sidebar-progress>span{color:var(--gold);font-family:var(--font-sans);letter-spacing:.18em;text-transform:uppercase;margin:0 0 10px;font-size:12px;font-weight:600;display:block}code,pre,kbd,samp{font-family:var(--font-mono)}pre{border:1px solid var(--hair);border-radius:var(--radius);background:var(--raised);max-width:100%;color:var(--text-2);white-space:pre;overflow-wrap:normal;padding:18px;font-size:14px;line-height:1.55;overflow-x:auto}.course-main textarea{width:100%;padding:14px}.code-editor{font-family:var(--font-mono);resize:vertical;background:var(--inset);min-height:360px;padding:20px;font-size:14px;line-height:1.6}.plain-reading,.plain-reading button,.plain-reading input,.plain-reading select,.plain-reading label,.plain-reading h1,.plain-reading h2,.plain-reading h3,.plain-reading .site-brand strong,.plain-reading .site-sidebar nav a{font-family:var(--font-plain)}.plain-reading{font-size:18px;line-height:1.8}.plain-reading h1{text-transform:none;letter-spacing:0}.course-main .course-lesson{background:0 0;border:0;padding:16px 0}.course-main .course-lab{padding:20px}.goals-card{border:1px solid var(--hair);border-radius:var(--radius);background:var(--raised);margin:18px 0 4px;padding:14px 18px}.goals-card ul{margin:6px 0 0;padding-left:22px}.goals-card li{margin:2px 0}.widget-caption{margin-top:22px}.widget-caption strong{color:var(--gold)}.sync-line{margin-top:8px}.course-quiz{padding:4px 0}.course-quiz legend{color:var(--muted);padding:0 8px}.quiz-option{border-radius:var(--radius);color:var(--text);border:1px solid #0000;align-items:flex-start;padding:10px 12px}.quiz-option span{gap:4px;display:grid}.quiz-option small{color:var(--text-2);font-size:.95rem;line-height:1.45}.quiz-option.right{border-color:var(--success);background:#5fb5831f}.quiz-option.right span:before{content:"✓ correct answer";color:var(--success);font-size:.85rem;font-weight:600}.quiz-option.wrong{border-color:var(--error);background:#d94f451f}.quiz-option.wrong span:before{content:"✗ your prediction";color:var(--text);font-size:.85rem;font-weight:600}.course-quiz:disabled .quiz-option{opacity:1}.unit-card h2{margin-bottom:4px}.unit-card small{color:var(--muted)}.unit-lessons{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:8px;margin:10px 0 0;padding:0;list-style:none;display:grid}.unit-lessons button{background:var(--raised);text-align:left;justify-content:flex-start;gap:12px;width:100%;min-height:56px;padding:8px 12px;font-size:1rem}.unit-lessons .lesson-number{border:1px solid var(--strong);width:30px;height:30px;color:var(--text);font-family:var(--font-mono);border-radius:50%;flex:none;place-items:center;font-size:.85rem;display:grid}.unit-lessons .lesson-name{line-height:1.25;display:grid}.unit-lessons .lesson-name small{color:var(--muted);font-size:.85rem}.unit-lessons button.done .lesson-number{border-color:var(--success);background:var(--success);color:#000}.unit-lessons button.started .lesson-number{border-color:var(--gold)}.circuit-diagram,.math-block{border:1px solid var(--hair);border-radius:var(--radius);background:var(--raised);margin:14px 0;padding:10px 12px;overflow-x:auto}.circuit-diagram 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0;border:0;padding:0}.widget-status{border-left:3px solid var(--gold);background:var(--hover);margin:14px 0 2px;padding:10px 14px}.widget-step{color:var(--gold);margin:6px 0;font-size:1.2rem;font-weight:600}.amplitudes{font-family:var(--font-mono)}.gate-legend{color:var(--muted);margin:6px 0 0;padding-left:20px}.register{flex-wrap:wrap;gap:10px;margin:8px 0 12px;display:flex}.register button{gap:0;min-width:64px;min-height:64px;padding:6px 12px;display:grid}.register small{color:var(--muted);font-family:var(--font-mono);font-size:.8rem}.register strong{color:inherit;font-family:var(--font-mono);font-size:1.6rem}.pair-grid>div{flex-wrap:wrap;gap:6px;display:flex}.pair-grid span{border-radius:var(--radius);color:var(--text);font-family:var(--font-mono);border:1px solid;padding:4px 8px}.pair-grid .agree{border-color:var(--success);background:#5fb5831f}.pair-grid .disagree{border-color:var(--error);background:#d94f451f}.curve-plot,.amp-bars,.phasors{margin:8px 0;display:block}.glossary-search{gap:6px;max-width:460px;margin:16px 0;display:grid}.glossary-entry p,.notebook-entry p{margin:6px 0}.glossary-entry strong,.notebook-entry strong{color:var(--gold)}@media (max-width:760px){.widget-grid{grid-template-columns:1fr}.panel.widget{padding:14px}.course-main .panel{padding:16px}}@media (max-width:540px){.course-main .course-lab{padding:12px}.course-main .course-lesson{padding:12px 0}.course-stages{gap:8px}}.mobile-bar{display:none}@media (max-width:880px){.mobile-bar{z-index:20;background:var(--inset);border-bottom:1px solid var(--hair);color:var(--text);align-items:center;gap:12px;padding:10px 16px;display:flex;position:sticky;top:0}.mobile-bar strong{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;font-weight:600;overflow:hidden}.site-sidebar{display:none}.site-sidebar.open{top:var(--mobile-bar-height);z-index:19;max-height:calc(100vh - var(--mobile-bar-height));display:flex;position:sticky;overflow-y:auto}.site-sidebar.open nav{display:grid;overflow:visible}.site-sidebar.open .sidebar-lesson{display:grid}.site-sidebar.open .sidebar-progress{margin-top:18px;display:block}}
.auth-paper{max-width:850px;min-height:75vh;margin:32px auto 60px}.auth-paper>h1{margin:20px 0}.auth-paper form{gap:20px;max-width:520px;margin:24px 0;display:grid}.auth-paper label{color:var(--text);gap:7px;display:grid}.auth-paper small{color:var(--muted)}.auth-paper form button{justify-self:start}.auth-paper input{min-height:44px}.auth-links{flex-wrap:wrap;gap:20px;margin-top:26px;display:flex}.auth-error,.auth-message{border:1px solid var(--error);border-radius:var(--radius);color:var(--text);background:#d94f451f;border-left-width:3px;padding:12px 16px}.auth-message{border-color:var(--success);background:#5fb5831f}.account-menu{color:var(--muted);flex-wrap:wrap;align-items:center;gap:10px;margin:0 0 24px;font-size:14px;display:flex}.account-menu p{color:var(--text);margin:0}.profile-section{border-top:1px solid var(--hair);margin-top:32px;padding-top:24px}.profile-avatar{border:1px solid var(--strong);-o-object-fit:cover;object-fit:cover;border-radius:50%;width:128px;height:128px;margin-bottom:18px;display:block}.avatar-placeholder{background:var(--raised);color:var(--gold);place-items:center;font-size:3rem;font-weight:600;display:grid}@media (max-width:880px){.auth-paper{width:auto;margin:12px 16px 40px}}.notebook-sync{border:1px solid var(--hair);border-radius:var(--radius);background:var(--raised);margin:16px 0 24px;padding:12px 16px}.notebook-sync>p{margin:0 0 8px}.notebook-sync button{margin:4px 0}.notebook-sync details{border-top:1px solid var(--hair);padding:12px 0}.notebook-conflict{grid-template-columns:1fr 1fr;gap:16px;display:grid}.notebook-conflict>div{min-width:0}.notebook-conflict pre{white-space:pre-wrap;max-height:250px;overflow:auto}@media (max-width:600px){.notebook-conflict{grid-template-columns:1fr}}
.cert-sheet-box{width:100%;container-type:inline-size}.cert-sheet{--mm:calc(100cqw / 297);--c-bg:#000;--c-ink:#fff;--c-soft:#ffffffa8;--c-faint:#fff6;--c-hair:#ffffff24;--c-gold:#d9b463;--c-logo-filter:none;aspect-ratio:297/210;width:100%;padding:calc(var(--mm) * 18) calc(var(--mm) * 20) calc(var(--mm) * 14);background:var(--c-bg);color:var(--c-ink);text-align:left;-webkit-print-color-adjust:exact;print-color-adjust:exact;font-family:TASA Orbiter,system-ui,sans-serif;font-weight:500;line-height:1.3;position:relative;overflow:hidden}.cert-sheet.light{--c-bg:#fbfaf6;--c-ink:#151b1b;--c-soft:#151b1bb8;--c-faint:#151b1b80;--c-hair:#151b1b29;--c-gold:#a77f2e;--c-logo-filter:invert(1) hue-rotate(180deg)}.cert-sheet :where(p){margin:0}.cert-frame{inset:calc(var(--mm) * 9);border:calc(var(--mm) * .3) solid var(--c-hair);pointer-events:none;position:absolute}.cert-frame i{width:calc(var(--mm) * 7);height:calc(var(--mm) * 7);border:0 solid var(--c-gold);position:absolute}.cert-frame i:first-child{top:calc(var(--mm) * -.3);left:calc(var(--mm) * -.3);border-top-width:calc(var(--mm) * .6);border-left-width:calc(var(--mm) * .6)}.cert-frame i:nth-child(2){top:calc(var(--mm) * -.3);right:calc(var(--mm) * -.3);border-top-width:calc(var(--mm) * .6);border-right-width:calc(var(--mm) * .6)}.cert-frame i:nth-child(3){bottom:calc(var(--mm) * -.3);left:calc(var(--mm) * -.3);border-bottom-width:calc(var(--mm) * .6);border-left-width:calc(var(--mm) * .6)}.cert-frame i:nth-child(4){bottom:calc(var(--mm) * -.3);right:calc(var(--mm) * -.3);border-bottom-width:calc(var(--mm) * .6);border-right-width:calc(var(--mm) * .6)}.cert-top{justify-content:space-between;align-items:center;display:flex}.cert-logo{height:calc(var(--mm) * 9);filter:var(--c-logo-filter)}.cert-kicker{font-size:calc(var(--mm) * 3);letter-spacing:.24em;text-transform:uppercase;color:var(--c-faint)}.cert-kicker b{color:var(--c-gold);font-weight:500}.cert-sheet .cert-body strong{color:var(--c-ink);font-weight:600}.cert-main{grid-template-columns:1fr calc(var(--mm) * 62);gap:calc(var(--mm) * 12);margin-top:calc(var(--mm) * 25);align-items:center;display:grid}.cert-label{font-size:calc(var(--mm) * 3.4);letter-spacing:.24em;text-transform:uppercase;color:var(--c-gold);margin-bottom:calc(var(--mm) * 7)}.cert-certifies{font-size:calc(var(--mm) * 4.6);color:var(--c-soft);margin-bottom:calc(var(--mm) * 2)}.cert-name{font-size:calc(var(--mm) * 17);letter-spacing:-.01em;color:var(--c-ink);overflow-wrap:anywhere;margin-bottom:calc(var(--mm) * 7);font-weight:700;line-height:1.02}.cert-dot{color:var(--c-gold)}.cert-body{font-size:calc(var(--mm) * 4.6);color:var(--c-soft);max-width:calc(var(--mm) * 170);margin-bottom:calc(var(--mm) * 6);line-height:1.5}.cert-topics{font-family:Space Mono,ui-monospace,monospace;font-size:calc(var(--mm) * 2.7);color:var(--c-faint);white-space:nowrap}.cert-topics span+span:before{content:" / ";color:var(--c-gold)}.cert-sketch{width:calc(var(--mm) * 62);height:calc(var(--mm) * 62)}.cert-sketch .ink{stroke:var(--c-ink);opacity:.75}.cert-sketch .gold{stroke:var(--c-gold)}.cert-sketch .dot{fill:var(--c-gold)}.cert-sketch text{fill:var(--c-soft);font-family:Space Mono,monospace;font-size:5.2px}.cert-bottom{left:calc(var(--mm) * 20);right:calc(var(--mm) * 20);bottom:calc(var(--mm) * 19);justify-content:space-between;align-items:flex-end;gap:calc(var(--mm) * 8);display:flex;position:absolute}.cert-facts{gap:calc(var(--mm) * 11);display:flex}.cert-facts .k{font-size:calc(var(--mm) * 2.5);letter-spacing:.24em;text-transform:uppercase;color:var(--c-faint);margin-bottom:calc(var(--mm) * 1.6)}.cert-facts .v{font-size:calc(var(--mm) * 3.6);color:var(--c-ink);white-space:nowrap}.cert-facts .v.mono{font-family:Space Mono,monospace;font-size:calc(var(--mm) * 3.2)}.cert-sign{flex:0 0 calc(var(--mm) * 66)}.cert-sign .script{height:calc(var(--mm) * 9)}.cert-sign .line{border-top:calc(var(--mm) * .3) solid var(--c-soft);margin-bottom:calc(var(--mm) * 2)}.cert-sign .who{font-size:calc(var(--mm) * 3.8);font-weight:600}.cert-sign .role{font-size:calc(var(--mm) * 3);color:var(--c-soft);margin-top:calc(var(--mm) * .6)}.cert-fine{left:calc(var(--mm) * 20);right:calc(var(--mm) * 20);bottom:calc(var(--mm) * 11.5);font-size:calc(var(--mm) * 2.2);color:var(--c-faint);letter-spacing:.02em;position:absolute}.cert-page{max-width:1040px;color:var(--text-2);margin:0 auto;padding:40px 32px 56px}.cert-page .back{margin-bottom:28px;font-size:15px;display:inline-block}.cert-page .kicker{letter-spacing:.24em;text-transform:uppercase;color:var(--muted);margin:0 0 14px;font-size:12px}.cert-page .kicker b{color:var(--gold);font-weight:500}.cert-page h1{letter-spacing:0;text-transform:none;max-width:none;margin:0 0 10px;font-size:clamp(32px,5vw,44px);line-height:1.05}.cert-page h1 .dot{color:var(--gold)}.cert-page>p{max-width:720px}.cert-page .lede{max-width:640px;margin:0 0 28px;font-size:17px}.cert-page h2{margin:32px 0 12px;font-size:20px}.cert-page .label{letter-spacing:.24em;text-transform:uppercase;color:var(--muted);font-size:12px}.cert-controls{flex-wrap:wrap;align-items:center;gap:14px 18px;margin:0 0 20px;display:flex}.cert-switch{border:1px solid var(--strong);border-radius:999px;padding:3px;display:inline-flex}.cert-switch button{min-height:36px;color:var(--text-2);letter-spacing:.12em;text-transform:uppercase;border:0;border-radius:999px;padding:0 16px;font-size:13px}.cert-switch .swatch{border:1px solid var(--muted);border-radius:50%;width:12px;height:12px}.cert-switch button[data-theme=dark] .swatch{background:#000}.cert-switch button[data-theme=light] .swatch{background:#fbfaf6}.cert-switch button[aria-pressed=true],.cert-switch button[aria-pressed=true]:hover:not(:disabled){background:var(--text);color:#000}.cert-switch button[aria-pressed=true] .swatch{border-color:#000}.cert-hint{color:var(--muted);font-size:14px}.cert-preview{border:1px solid var(--hair);border-radius:var(--radius);background:var(--raised);padding:18px}.cert-actions{flex-wrap:wrap;gap:12px;margin-top:22px;display:flex}.cert-actions .btn{border:1px solid var(--strong);min-height:48px;color:var(--text);letter-spacing:.14em;text-transform:uppercase;background:0 0;border-radius:0;justify-content:center;align-items:center;padding:0 22px;font-size:13px;text-decoration:none;display:inline-flex}.cert-actions .btn:hover{background:var(--hover)}.cert-actions .btn.primary,.cert-actions .btn.primary:hover:not(:disabled){background:var(--gold);border-color:var(--gold);color:#151b1b;font-weight:600}.cert-note{color:var(--muted);margin:16px 0 0;font-size:14px}.cert-note code{color:var(--text-2);overflow-wrap:anywhere}.cert-note a{color:var(--text-2)}.cert-progress{gap:8px;max-width:520px;margin:0 0 8px;display:grid}.cert-progress progress{width:100%;height:10px;accent-color:var(--gold)}.cert-missing{gap:8px;margin:0;padding:0;list-style:none;display:grid}.cert-missing a{border:1px solid var(--hair);border-radius:var(--radius);background:var(--raised);color:var(--text);justify-content:space-between;align-items:center;gap:16px;padding:12px 16px;text-decoration:none;display:flex}.cert-missing a:hover{background:var(--hover)}.cert-missing small{color:var(--gold);letter-spacing:.08em;text-transform:uppercase;flex:none;font-size:13px}.cert-form{gap:16px;max-width:560px;display:grid}.cert-form label{color:var(--text);gap:7px;display:grid}.cert-form small{color:var(--muted)}.cert-form .buttons{flex-wrap:wrap;gap:12px;display:flex}.cert-warning{border:1px solid var(--gold);border-radius:var(--radius);color:var(--text);background:#d9b4631a;border-left-width:3px;margin:0;padding:12px 16px}.cert-links{flex-wrap:wrap;gap:12px;margin-top:20px;display:flex}@media (max-width:540px){.cert-page{padding:24px 16px 40px}.cert-preview{padding:8px}.cert-actions .btn{flex:100%}.cert-missing a{flex-direction:column;align-items:flex-start;gap:2px}}@media print{html,body{background:0 0;margin:0}.cert-print-hide{display:none!important}.cert-page{max-width:none;margin:0;padding:0}.cert-preview{background:0 0;border:0;border-radius:0;padding:0}.cert-sheet-box{width:297mm}.cert-sheet{aspect-ratio:auto;-moz-column-break-inside:avoid;break-inside:avoid;height:210mm}}