:root{color-scheme:light;--ground:#f5f5f5;--surface:#fff;--ink:#2d3142;--muted:#4f5d75;--rule:#c8cdd4;--accent:#a94019;--tint:#fff0e8;--blue:#285299;--success:#226044;--success-bg:#eaf5ee;--error:#952f30;--error-bg:#fff0ef;--sidebar:#e9edf1;--focus:#285299;font-family:"Geist",-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;font-size:16px;line-height:1.65}
*{box-sizing:border-box}body{margin:0;background:var(--ground);color:var(--ink)}html{scroll-behavior:smooth;scroll-padding-top:24px}h1,h2,h3,h4{line-height:1.2;text-wrap:balance}h1{font-size:2.1rem;font-weight:600;letter-spacing:-.025em;margin:0 0 16px}h2{font-size:1.8rem;letter-spacing:-.02em;margin:0 0 16px}h3{font-size:1.15rem;margin:32px 0 12px}h4{font-size:1rem;margin:24px 0 8px}p{max-width:72ch;text-wrap:pretty;margin:0 0 16px}ul,ol{padding-left:1.25rem}li+li{margin-top:8px}a{color:var(--blue);text-underline-offset:4px}a:hover{text-decoration-thickness:2px}button,input,select,textarea{font:inherit}button,select{cursor:pointer}input,select,textarea{max-width:100%;color:var(--ink);background:var(--surface);border:1px solid #939cac;border-radius:6px;padding:10px 12px;min-height:44px;caret-color:var(--accent)}input::placeholder,textarea::placeholder{color:#586275;opacity:1}input:not([type=checkbox]):not([type=radio]):not([type=range]),select,textarea{width:100%}textarea{resize:vertical;min-height:100px}input[type=checkbox],input[type=radio]{accent-color:var(--accent);width:18px;height:18px;min-height:18px;flex:0 0 18px;margin:4px 0 0}input[type=range]{padding:0;accent-color:var(--accent);width:100%;border:0}button:disabled{cursor:not-allowed;opacity:.52}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:3px}h2:focus,h3:focus{outline:none}::selection{background:#efd1c4;color:#222638}button{transition:background-color .18s ease-out,color .18s ease-out}label{font-weight:600;font-size:.9rem;display:block;margin-bottom:6px}fieldset{min-width:0;border:0;padding:0;margin:0 0 24px}legend{font-weight:600;line-height:1.5;padding:0;margin-bottom:12px}summary{cursor:pointer;font-weight:600;min-height:44px;padding:12px 0}summary::marker{color:var(--accent)}.small,.link-note{font-size:.78rem;color:var(--muted);line-height:1.55}.small{margin:8px 0 0}.skip-link{position:fixed;top:8px;left:8px;z-index:10;transform:translateY(-160%);background:var(--surface);padding:12px}.skip-link:focus{transform:translateY(0)}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:20px 36px;border-bottom:1px solid var(--rule);background:var(--surface)}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none}.brand svg{width:32px;height:32px;stroke:var(--accent);stroke-width:1.8;fill:none}.brand strong{font-size:1.15rem}.brand span{font-size:.88rem;border-left:1px solid var(--rule);padding-left:16px;color:var(--muted)}.topbar nav{display:flex;flex-wrap:wrap;gap:12px 24px;font-size:.8rem}.course-intro{max-width:1600px;margin:0 auto;padding:36px;display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:48px;align-items:center}.course-intro p{color:var(--muted);font-size:1rem;margin:0;max-width:72ch}.course-context{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding:16px 0;display:flex;flex-direction:column;gap:4px;font-size:.83rem}.course-context strong{font-size:.9rem}.course-context span{color:var(--muted)}.course-context a{margin-top:6px}
.course-layout{max-width:1600px;margin:0 auto;display:grid;grid-template-columns:252px minmax(0,1fr);gap:36px;padding:0 36px 48px}.course-sidebar{align-self:start;background:var(--sidebar);padding:20px 16px;border-radius:8px}.role-control select{font-size:.83rem;padding-left:9px}.progress-wrap{padding:24px 0 20px;border-bottom:1px solid var(--rule);margin-bottom:12px}.progress-wrap label{font-size:.82rem}progress{width:100%;height:8px;display:block;border:0;border-radius:4px;background:#d1d8df;overflow:hidden;margin:12px 0}progress::-webkit-progress-bar{background:#d1d8df}progress::-webkit-progress-value{background:var(--accent)}progress::-moz-progress-bar{background:var(--accent)}#course-menu>summary{font-size:.85rem}.nav-item,.lesson-link{font-size:.84rem;line-height:1.4;text-decoration:none;color:var(--ink);display:block;padding:12px 10px;border-radius:5px;margin:3px 0;border:1px solid transparent}.nav-item:hover,.lesson-link:hover{background:#f7f9fb}.nav-item.is-active,.lesson-link.is-active,[aria-current=step]{background:var(--surface);border-color:#a7b0bf;font-weight:600}.is-complete{color:var(--success)}.nav-item small,.lesson-link small{display:block;margin-top:4px;color:var(--muted);font-size:.72rem}.nav-item .tag,.lesson-link .tag{font-size:.66rem;padding:1px 4px;margin-top:4px}.progress-tools{margin-top:20px;padding-top:20px;border-top:1px solid var(--rule)}.progress-tools .button{width:100%;font-size:.77rem;padding:9px 8px}.text-button{padding:8px 0;color:var(--muted);border:0;background:none;text-decoration:underline;text-underline-offset:3px;font-size:.78rem;min-height:40px}
.lesson-heading{padding:8px 0 26px;border-bottom:1px solid var(--rule);margin-bottom:28px}.lesson-meta{color:var(--muted);font-size:.82rem;margin-bottom:10px}.lesson-heading h2{font-size:1.85rem}.lesson-goal{font-size:1rem;max-width:80ch;margin-bottom:10px}.practice-jump{font-size:.82rem}.workbench{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(330px,.95fr);gap:36px;align-items:start}#lesson-content{min-width:0;font-size:.94rem}#lesson-content>:first-child{margin-top:0}.prose{max-width:72ch}.prose p{line-height:1.75}.concept-list{margin:24px 0}.concept-list dt{font-weight:600;margin-top:16px}.concept-list dd{margin:4px 0 0;color:var(--muted)}.concept-list p{margin-bottom:12px}.steps{padding-left:22px}.steps li{padding-left:6px;margin-bottom:20px}.steps h3,.steps h4{margin:0 0 6px;font-size:.98rem}.steps p{margin:4px 0 0}.io-pair{display:grid;grid-template-columns:1fr 1fr;gap:24px;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding:16px 0;margin:24px 0}.io-pair h3,.io-pair h4{margin:0 0 8px}.io-pair ul{font-size:.85rem;margin:0}.notice,.prototype-note{padding:16px;background:#e9edf1;border-radius:6px;font-size:.85rem;line-height:1.65;margin:20px 0}.notice strong,.prototype-note strong{color:var(--ink)}.notice p:last-child,.prototype-note p:last-child{margin-bottom:0}.tag{font-size:.75rem;line-height:1.5;display:inline-block;padding:2px 8px;border:1px solid var(--rule);border-radius:4px;color:var(--muted);font-weight:500}.quizzes{border-top:1px solid var(--rule);margin-top:32px;padding-top:8px}.quiz-question{padding:12px 0 20px}.options{display:grid;gap:8px}.option{display:flex;align-items:flex-start;gap:10px;font-size:.87rem;font-weight:400;border:1px solid var(--rule);border-radius:6px;padding:12px;margin:0;background:var(--surface);line-height:1.5;cursor:pointer}.option:has(input:checked){border-color:var(--accent);background:var(--tint)}.option:focus-within{outline:2px solid var(--focus);outline-offset:2px}.feedback{margin:16px 0 0;padding:14px 16px;border-radius:6px;border:1px solid var(--rule);font-size:.86rem;line-height:1.6;background:#edf1f7;color:var(--ink)}.feedback[data-tone=success]{background:var(--success-bg);color:var(--success);border-color:#a4c4b2}.feedback[data-tone=error]{background:var(--error-bg);color:var(--error);border-color:#d7aeab}.feedback:empty{display:none}.feedback ul{margin:8px 0}.feedback p:last-child{margin-bottom:0}
.practice-panel{background:var(--surface);border:1px solid var(--rule);border-radius:8px;padding:24px;min-width:0;position:relative}.practice-header{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;padding-bottom:18px;border-bottom:1px solid var(--rule);margin-bottom:20px}.practice-header h3{margin:0;font-size:1.2rem}.practice-status{font-size:.7rem;color:var(--accent);background:var(--tint);padding:4px 8px;border-radius:4px}.lab-form{margin-top:20px}.field{margin-bottom:16px;min-width:0}.field small{display:block;color:var(--muted);line-height:1.5;margin-top:6px}.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}.lab-form label{font-size:.83rem}.lab-form input,.lab-form select,.lab-form textarea{font-size:.87rem}.lab-preview{background:var(--ground);border:1px solid var(--rule);border-radius:6px;padding:16px;font-size:.85rem;margin:20px 0;overflow-wrap:anywhere}.lab-preview h4{margin:0 0 12px}.lab-preview p{margin-bottom:8px}.lab-preview p:last-child{margin-bottom:0}.check-list{display:grid;gap:10px}.check-list label{display:flex;gap:10px;align-items:flex-start;font-weight:400;line-height:1.5;font-size:.87rem}.trace-strip{display:flex;flex-wrap:wrap;gap:8px;padding:14px 0}.trace-item{font-size:.76rem;border:1px solid var(--rule);border-radius:4px;padding:8px;background:var(--surface);overflow-wrap:anywhere}.trace-item.is-active{border-color:var(--accent);background:var(--tint)}.button{display:inline-flex;justify-content:center;align-items:center;gap:8px;background:var(--accent);color:white;border:1px solid var(--accent);border-radius:6px;padding:11px 16px;min-height:44px;font-size:.85rem;font-weight:600;text-decoration:none}.button:hover{background:#8a3012;color:white}.button-secondary{background:var(--surface);color:var(--ink);border-color:#9ca6b5}.button-secondary:hover{background:#e9edf1;color:var(--ink)}.lesson-controls{display:flex;justify-content:space-between;align-items:center;gap:16px;border-top:1px solid var(--rule);margin-top:40px;padding-top:24px}.lesson-controls p{font-size:.78rem;color:var(--muted);margin:0;max-width:36ch;text-align:center}.lesson-controls .button{white-space:nowrap}
.reference-section,.facilitator-section{max-width:1528px;margin:0 auto;padding:40px 0;border-top:1px solid var(--rule);scroll-margin-top:24px}.section-heading{display:grid;grid-template-columns:1fr 1.4fr;gap:48px;margin-bottom:24px}.section-heading h2{font-size:1.6rem}.section-heading p{font-size:.92rem;color:var(--muted);margin:0}.reference-section>label{font-size:.87rem}.reference-section>input{max-width:760px;margin-bottom:20px}.resource-row{padding:18px 0;border-bottom:1px solid var(--rule);font-size:.86rem}.resource-row h3,.resource-row h4{font-size:1rem;margin:0 0 12px}.resource-row p{max-width:110ch;margin-bottom:8px}.resource-row .tag{margin-left:8px}.resource-row summary{padding:0;display:block}.resource-row summary::before{content:'+';display:inline-block;font-weight:400;margin-right:10px}.resource-row[open] summary::before{content:'−'}.resource-row dl{display:grid;grid-template-columns:110px 1fr;gap:8px 24px}.resource-row dt{font-weight:600}.resource-row dd{margin:0}.reference-detail{border-top:1px solid var(--rule);margin-top:28px;padding-top:8px}.reference-detail summary{font-size:.95rem}.glossary{columns:2;column-gap:48px}.glossary>div{break-inside:avoid;margin:0 0 18px}.glossary dt{font-weight:600;font-size:.93rem}.glossary dd{font-size:.85rem;color:var(--muted);margin:4px 0 18px;max-width:65ch}.facilitator-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}.facilitator-grid h3{margin-top:0}.agenda{list-style:none;padding:0}.agenda li{display:grid;grid-template-columns:64px 1fr;gap:20px;padding:12px 0;border-bottom:1px solid var(--rule);font-size:.88rem}.agenda time{color:var(--muted);font-variant-numeric:tabular-nums}.facilitator-grid ol{font-size:.9rem}.support-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:36px}.support-grid li{font-size:.85rem}.support-grid h3{font-size:1rem}footer{max-width:1528px;margin:16px auto 0;border-top:1px solid var(--rule);padding:28px 0;font-size:.78rem;color:var(--muted)}footer p{max-width:120ch}.noscript{position:fixed;bottom:0;background:var(--error-bg);border:1px solid var(--error);padding:20px;width:100%}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.lab-actions{display:flex;flex-wrap:wrap;gap:12px;margin:20px 0 0}.lesson-completion{margin:24px 0;padding:16px;border:1px solid var(--rule);border-radius:6px;font-size:.86rem}.nav-item{display:grid;grid-template-columns:22px minmax(0,1fr);gap:3px 8px}.nav-item>span:last-child{grid-column:2}.nav-item .nav-number{font-variant-numeric:tabular-nums;color:var(--muted)}
@media(min-width:1600px){.course-layout{gap:48px}.workbench{gap:48px}}
@media(max-width:1599px){.reference-section,.facilitator-section,footer{margin-left:36px;margin-right:36px}}
@media(max-width:1200px){.workbench{grid-template-columns:minmax(0,1fr)}.practice-panel{position:static}.course-layout{grid-template-columns:230px minmax(0,1fr);gap:28px}.lesson-heading h2{font-size:1.65rem}.topbar{padding:16px 24px}.course-intro{padding:28px 24px;gap:28px;grid-template-columns:1fr 280px}.course-layout{padding:0 24px 40px}.reference-section,.facilitator-section,footer{margin-left:24px;margin-right:24px}.brand span{display:none}.support-grid{grid-template-columns:1fr}}
@media(max-width:760px){.topbar{align-items:flex-start;padding:16px;gap:12px}.topbar nav{gap:8px 14px;justify-content:flex-end;font-size:.72rem}.topbar .link-note{display:none}.brand{gap:8px}.brand svg{width:26px;height:26px}.course-intro{grid-template-columns:1fr;padding:24px 16px;gap:20px}h1{font-size:1.65rem}.course-context{font-size:.8rem}.course-layout{grid-template-columns:1fr;padding:0 16px 32px;gap:24px}.course-sidebar{padding:16px}.role-control{display:grid;grid-template-columns:1fr 1fr;gap:6px 12px;align-items:center}.role-control label{margin:0}.role-control p{grid-column:1/-1}.progress-wrap{padding:12px 0;margin:0}.progress-tools{margin-top:12px;padding-top:12px;display:grid;grid-template-columns:1fr 1fr;gap:0 12px}.progress-tools .small{grid-column:1/-1}.progress-tools .button{font-size:.74rem}.lesson-heading{padding-top:0;margin-bottom:24px}.lesson-heading h2{font-size:1.6rem}.workbench{gap:28px}.practice-panel{padding:20px}.io-pair{gap:16px}.lesson-controls{flex-wrap:wrap}.lesson-controls p{order:3;max-width:none;text-align:left;flex:1 0 100%}.reference-section,.facilitator-section,footer{margin-left:16px;margin-right:16px}.section-heading{grid-template-columns:1fr;gap:0}.facilitator-grid{grid-template-columns:1fr;gap:28px}.section-heading h2{font-size:1.4rem}.glossary{columns:1}.field-grid{grid-template-columns:1fr}.resource-row dl{grid-template-columns:1fr;gap:4px}.resource-row dd{margin-bottom:12px}.agenda li{grid-template-columns:50px 1fr;gap:12px}.topbar nav a:last-child{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}
@media print{.topbar,.course-sidebar,.practice-panel,.lesson-controls,.reference-section,footer,.course-context,.practice-jump,.facilitator-section{display:none}.course-layout,.workbench{display:block;padding:0}.course-intro{display:block;padding:0}.lesson-heading{margin-top:24px}body{background:white}.quizzes{break-before:page}}
#resource-results{max-height:36rem;overflow:auto;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding-right:12px;scrollbar-color:#8995a5 #e9edf1}#resource-results:focus-visible{outline:3px solid var(--focus);outline-offset:4px}
