.qt-shell{--qt-blue:#185fa5;--qt-navy:#142a45;--qt-teal:#0f6e56;--qt-amber:#ba7517;--qt-red:#b42318;--qt-purple:#534ab7;max-width:1120px;margin:auto;padding:24px}.qt-hero{padding:48px;border:1px solid var(--line);border-radius:24px;background:linear-gradient(135deg,var(--tint),var(--card));position:relative;overflow:hidden}.qt-hero:after{content:"";position:absolute;width:300px;height:300px;border-radius:50%;right:-120px;top:-120px;background:color-mix(in srgb,var(--teal) 14%,transparent)}.qt-kicker{font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--teal);font-size:12px}.qt-hero h1{font-size:clamp(34px,5vw,60px);line-height:1.02;margin:12px 0 16px}.qt-hero p{max-width:760px;font-size:17px;line-height:1.7;color:var(--muted)}.qt-pills{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}.qt-pill{border:1px solid var(--line);background:var(--card);padding:7px 11px;border-radius:999px;font-size:12px;font-weight:700}.qt-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:18px;margin:28px 0}.qt-card{grid-column:span 4;border:1px solid var(--line);background:var(--card);border-radius:18px;padding:22px;box-shadow:0 12px 30px rgba(15,23,42,.05)}.qt-card.wide{grid-column:span 8}.qt-card.full{grid-column:1/-1}.qt-card h2,.qt-card h3{margin-top:0}.qt-callout{border-left:4px solid var(--qt-blue);background:color-mix(in srgb,var(--qt-blue) 8%,var(--card));padding:16px 18px;border-radius:10px}.qt-workbench{border:1px solid var(--line);border-radius:18px;padding:22px;background:var(--card)}.qt-toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:end;margin-bottom:18px}.qt-toolbar label{display:flex;flex-direction:column;gap:6px;font-size:12px;font-weight:700}.qt-toolbar input,.qt-toolbar select,.qt-toolbar textarea{border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:8px;padding:10px;font:inherit}.qt-btn{border:0;border-radius:9px;padding:10px 14px;font-weight:800;cursor:pointer;background:var(--qt-blue);color:#fff}.qt-btn.secondary{background:var(--card);color:var(--ink);border:1px solid var(--line)}.qt-sequence{display:flex;gap:10px;overflow-x:auto;padding:10px 2px}.qt-step{min-width:145px;border:1px solid var(--line);border-radius:14px;padding:14px;background:var(--card);cursor:pointer}.qt-step.active{outline:3px solid color-mix(in srgb,var(--qt-blue) 35%,transparent)}.qt-step b{display:block}.qt-step small{color:var(--muted)}.qt-chart{width:100%;height:320px;border-radius:12px;background:linear-gradient(to bottom,var(--tint),transparent);position:relative;overflow:hidden}.qt-bars{height:260px;display:flex;align-items:end;gap:12px;padding:20px}.qt-bar{flex:1;background:var(--qt-blue);min-width:26px;border-radius:7px 7px 0 0;position:relative;transition:.25s}.qt-bar span{position:absolute;bottom:100%;left:50%;transform:translateX(-50%);font-size:11px;font-weight:800}.qt-bar label{position:absolute;top:100%;left:50%;transform:translateX(-50%);font-size:11px;text-align:center;width:95px}.qt-fishbone{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.qt-bone{border:1px dashed var(--line);border-radius:12px;padding:12px;min-height:120px}.qt-chip{display:inline-flex;margin:4px;padding:7px 9px;border-radius:999px;background:var(--tint);font-size:12px;cursor:grab}.qt-quiz button{display:block;width:100%;text-align:left;margin:8px 0;border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:10px;padding:12px;cursor:pointer}.qt-feedback{font-weight:700;min-height:24px;margin-top:8px}.qt-map{display:grid;grid-template-columns:repeat(7,minmax(120px,1fr));gap:9px;overflow-x:auto}.qt-node{border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center;background:var(--card);cursor:pointer}.qt-node.active{background:color-mix(in srgb,var(--qt-teal) 12%,var(--card));border-color:var(--qt-teal)}.qt-progress{height:9px;background:var(--tint);border-radius:999px;overflow:hidden}.qt-progress>span{display:block;height:100%;background:var(--qt-teal);transition:.25s}.qt-scenario{padding:18px;border:1px solid var(--line);border-radius:14px;background:var(--tint)}.qt-table{width:100%;border-collapse:collapse}.qt-table th,.qt-table td{border:1px solid var(--line);padding:10px;text-align:left}.qt-table th{background:var(--tint)}.qt-hidden{display:none!important}

/* Production site chrome and Lesson Creation Guild integration */
.skip-link{position:fixed;left:16px;top:-80px;z-index:10000;padding:11px 15px;border-radius:8px;background:var(--navy);color:#fff;font-weight:700;transition:top .15s ease}.skip-link:focus{top:16px}.lesson-wrapper{min-width:0}.lesson-toc,.lesson-requirement-section{max-width:960px;margin:32px auto;padding:22px;border:1px solid var(--line);border-radius:14px;background:var(--card);color:var(--ink)}.lesson-toc ol{columns:2;column-gap:32px;margin:0;padding-left:22px}.lesson-toc li{break-inside:avoid;margin:7px 0}.lesson-toc a{color:var(--teal)}.practice-card{padding:18px;border-left:4px solid var(--amber);background:var(--tint);border-radius:10px}.practice-answer{margin-top:16px;padding:14px;border:1px solid var(--line);border-radius:9px;background:var(--surface-soft,var(--tint))}.lesson-action-button{min-height:44px;border:1px solid var(--line);border-radius:9px;background:var(--teal);color:#fff;padding:10px 14px;font:inherit;font-weight:700;cursor:pointer}.lesson-action-button.secondary{background:var(--card);color:var(--ink)}.lesson-guide-quiz fieldset{margin:18px 0;padding:16px;border:1px solid var(--line);border-radius:10px}.lesson-guide-quiz legend{padding:0 6px;font-weight:700}.lesson-guide-quiz label{display:block;margin:8px 0;padding:10px;border:1px solid transparent;border-radius:8px;cursor:pointer}.lesson-guide-quiz label:focus-within{outline:3px solid color-mix(in srgb,var(--teal) 35%,transparent)}.lesson-guide-quiz .correct-answer{border-color:var(--success);background:color-mix(in srgb,var(--success) 12%,var(--card))}.lesson-guide-quiz .incorrect-answer{border-color:var(--danger);background:color-mix(in srgb,var(--danger) 10%,var(--card))}.lesson-guide-quiz .needs-answer{border-color:var(--warning)}.quiz-explanation{margin:10px 0 0;color:var(--ink-soft)}.quiz-actions{display:flex;flex-wrap:wrap;gap:10px}.quiz-score{font-weight:800;min-height:24px}.remember-box{padding:16px;border-left:4px solid var(--teal);background:var(--tint);border-radius:9px;line-height:1.7}.feedback-success{color:var(--success)}.feedback-error{color:var(--danger)}

.lesson-hero-controls{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}.lesson-section-back{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:10px 15px;border:1px solid var(--line);border-radius:9px;background:var(--card);color:var(--ink);font-size:13.5px;font-weight:700;text-decoration:none;box-shadow:0 1px 2px rgba(15,23,42,.04)}.lesson-section-back:hover{border-color:var(--teal);color:var(--teal);background:var(--tint)}.lesson-meta-line{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.lesson-meta-line span{display:inline-flex;align-items:center;min-height:30px;padding:5px 10px;border:1px solid var(--line);border-radius:999px;background:var(--card);color:var(--ink-soft);font-size:12px;font-weight:700}

.lesson-completion-panel{padding:54px 20px;border-top:1px solid var(--line);background:var(--tint)}.lesson-completion-inner{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:22px;align-items:center;max-width:1180px;margin:0 auto;padding:28px;border:1px solid var(--line);border-radius:16px;background:var(--card);box-shadow:0 12px 30px rgba(15,23,42,.06)}.lesson-completion-icon{display:grid;place-items:center;width:52px;height:52px;border-radius:50%;background:color-mix(in srgb,var(--teal) 14%,var(--card));color:var(--teal);font-size:26px;font-weight:800}.lesson-completion-kicker{margin:0 0 6px;color:var(--teal);font-size:11.5px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.lesson-completion-panel h2{margin:0 0 7px;font-size:24px}.lesson-completion-copy{margin:0;color:var(--muted);line-height:1.6}.lesson-completion-actions{display:flex;justify-content:flex-end;gap:10px;flex-wrap:wrap}.lesson-completion-actions .btn{white-space:nowrap}

button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid color-mix(in srgb,var(--teal) 40%,transparent);outline-offset:2px}

@media(max-width:1040px){header.site .desktop-nav{gap:18px}.lesson-completion-inner{grid-template-columns:auto 1fr}.lesson-completion-actions{grid-column:1/-1;justify-content:flex-start;padding-left:74px}.lesson-toc ol{columns:1}}
@media(max-width:800px){.qt-shell{padding:14px}.qt-hero{padding:28px 22px}.qt-card,.qt-card.wide{grid-column:1/-1}.qt-fishbone{grid-template-columns:1fr}.qt-map{grid-template-columns:repeat(7,140px)}.lesson-toc,.lesson-requirement-section{margin:24px 0;padding:18px}.lesson-guide-quiz fieldset{padding:12px}.lesson-hero-controls{align-items:flex-start}.lesson-completion-panel{padding:34px 14px}.lesson-completion-inner{grid-template-columns:1fr;padding:22px}.lesson-completion-actions{grid-column:auto;padding-left:0;justify-content:flex-start}.lesson-completion-actions .btn{width:100%;justify-content:center;text-align:center}}
@media(max-width:560px){.lesson-meta-line{width:100%}.lesson-meta-line span{flex:1;justify-content:center}.lesson-section-back{width:100%;justify-content:center}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}