@layer reset{*,:before,:after{box-sizing:border-box}html{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;text-rendering:optimizelegibility;background:#f5f1e8;min-width:20rem;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.5}body,h1,h2,h3,p{margin:0}body{min-height:100vh}button,input,textarea,select{font:inherit}a{color:inherit}}@layer base{[hidden]{display:none!important}:root{--paper:#f5f1e8;--surface:#fffdf8;--surface-strong:#fff;--ink:#152d35;--ink-soft:#52656a;--line:#c9d1cd;--line-strong:#819397;--teal:#0a6b69;--teal-dark:#064d4c;--teal-pale:#d8efea;--amber-pale:#fff1c9;--coral:#b74d3d;--shadow:0 1rem 3rem #17303617;--radius-small:.65rem;--radius:1rem;--radius-large:1.5rem;--page-width:74rem}body{background:radial-gradient(circle at 92% 0%, #0a6b6914, transparent 28rem), var(--paper);min-height:100vh;color:var(--ink);flex-direction:column;display:flex}main{flex:1}h1,h2,h3{letter-spacing:-.025em;text-wrap:balance;font-family:Georgia,Times New Roman,serif;font-weight:700;line-height:1.08}h1{font-size:clamp(2.4rem,6vw,5.25rem)}h2{font-size:clamp(1.75rem,3vw,2.7rem)}h3{font-size:1.35rem}p{color:var(--ink-soft)}:focus-visible{outline:.2rem solid var(--coral);outline-offset:.2rem}.page-width{width:min(calc(100% - 2.5rem), var(--page-width));margin-inline:auto}.eyebrow{color:var(--teal-dark);letter-spacing:.11em;text-transform:uppercase;font-size:.78rem;font-weight:800}.lede{max-width:42rem;font-size:clamp(1.05rem,1.5vw,1.25rem)}.skip-link{z-index:100;border-radius:var(--radius-small);background:var(--ink);color:#fff;padding:.75rem 1rem;font-weight:700;position:fixed;top:.75rem;left:.75rem;transform:translateY(-150%)}.skip-link:focus{transform:translateY(0)}}@layer components{home-progress,pilot-access{display:block}.site-header{-webkit-backdrop-filter:blur(.75rem);backdrop-filter:blur(.75rem);background:#f5f1e8e6;border-bottom:1px solid #81939761}.header-inner{justify-content:space-between;align-items:center;gap:2rem;min-height:5rem;display:flex}.brand{align-items:center;gap:.75rem;min-height:2.75rem;text-decoration:none;display:inline-flex}.brand strong,.brand small{display:block}.brand strong{color:var(--ink);font-family:Georgia,Times New Roman,serif;font-size:1.08rem}.brand small{color:var(--ink-soft);font-size:.72rem}.brand-mark{border:2px solid var(--teal-dark);background:var(--teal-pale);border-radius:50%;flex:none;place-items:center;width:2.65rem;height:2.65rem;display:grid;position:relative}.brand-mark:before,.brand-mark:after,.brand-mark span{background:var(--teal-dark);content:"";display:block;position:absolute}.brand-mark:before{width:1.2rem;height:.14rem}.brand-mark:after{width:.14rem;height:1.2rem}.brand-mark span{width:.4rem;height:.4rem;box-shadow:1rem 0 0 var(--teal-dark), -1rem 0 0 var(--teal-dark);border-radius:50%}nav{gap:.35rem;display:flex}nav a{min-height:2.75rem;color:var(--ink-soft);border-radius:999px;padding:.68rem .9rem;font-size:.92rem;font-weight:750;text-decoration:none}nav a:hover,nav a[aria-current=page]{background:var(--surface);color:var(--ink);box-shadow:inset 0 0 0 1px var(--line)}.button{background:var(--teal);color:#fff;border:2px solid #0000;border-radius:999px;justify-content:center;align-items:center;gap:.6rem;min-height:3rem;padding:.72rem 1.1rem;font-weight:800;text-decoration:none;transition:background-color .16s,transform .16s;display:inline-flex}.button:hover{background:var(--teal-dark);transform:translateY(-1px)}.button.secondary{border-color:var(--line-strong);color:var(--ink);background:0 0}.button.secondary:hover{border-color:var(--ink);background:var(--surface)}.home-hero{grid-template-columns:minmax(0,1.5fr) minmax(16rem,.65fr);gap:clamp(2rem,6vw,5rem);padding-block:clamp(3.5rem,8vw,7rem);display:grid}.hero-copy{align-content:center;gap:1.4rem;display:grid}.hero-copy h1{max-width:13ch}.hero-actions{flex-wrap:wrap;gap:.75rem;margin-top:.35rem;display:flex}.home-progress-summary{border-left:.25rem solid var(--teal);max-width:44rem;color:var(--ink);background:#d8efea8c;padding:.8rem 1rem;font-weight:700}.week-note{border:1px solid var(--line);border-radius:var(--radius-large);background:var(--surface);box-shadow:var(--shadow);align-self:center;padding:1.5rem;position:relative;overflow:hidden}.week-note:before{border:1.1rem solid var(--amber-pale);content:"";border-radius:50%;width:7rem;height:7rem;position:absolute;inset:-3rem -2.5rem auto auto}.week-note strong{margin-block:.35rem 1rem;font-family:Georgia,Times New Roman,serif;font-size:1.6rem;display:block}.week-note ol{color:var(--ink-soft);gap:.75rem;margin:0;padding-left:1.3rem;display:grid}.sessions-section{padding-block:1rem 6rem}.section-heading{justify-content:space-between;align-items:end;gap:1.5rem;margin-bottom:1.5rem;display:flex}.section-heading>div{gap:.65rem;display:grid}.session-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;display:grid}.session-card{border:1px solid var(--line);border-radius:var(--radius);background:#fffdf8b8;grid-template-rows:auto auto 1fr auto;gap:1rem;min-height:17rem;padding:clamp(1.25rem,3vw,1.75rem);display:grid}.session-card.featured{border-color:var(--teal);background:var(--surface-strong);box-shadow:var(--shadow)}.session-card-topline,.session-card-footer{justify-content:space-between;align-items:center;gap:1rem;display:flex}.session-date{color:var(--ink-soft);font-size:.83rem;font-weight:650}.session-date span{color:var(--ink);font-weight:850}.status-chip{background:var(--teal-pale);min-height:1.8rem;color:var(--teal-dark);border-radius:999px;align-items:center;padding:.3rem .65rem;font-size:.72rem;font-weight:850;display:inline-flex}.session-card-footer{border-top:1px solid var(--line);color:var(--ink-soft);padding-top:1rem;font-size:.85rem;font-weight:700}.session-card-footer a{min-height:2.75rem;color:var(--teal-dark);text-underline-offset:.2rem;padding:.65rem;font-weight:850;text-decoration-thickness:.12rem}.optional-session{grid-column:1/-1;min-height:auto}.access-section{grid-template-columns:minmax(0,1fr) minmax(20rem,.9fr);align-items:start;gap:clamp(1.5rem,5vw,4rem);padding-block:0 6rem;display:grid}.access-section>div:first-child{gap:.75rem;display:grid}.access-section h2{max-width:18ch}.access-code-card,.pilot-access-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow);gap:1rem;padding:clamp(1.25rem,3vw,1.75rem);display:grid}.access-code-card>span,.pilot-access-card form>label{color:var(--ink);font-size:.85rem;font-weight:800}.access-code-card output{overflow-wrap:anywhere;color:var(--ink);letter-spacing:.05em;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:clamp(1rem,2.2vw,1.35rem);font-weight:800}.access-actions{flex-wrap:wrap;gap:.65rem;display:flex}.access-code-card>p,.pilot-access-card form>p{font-size:.85rem}.access-page{width:min(100% - 2.5rem,48rem);padding-block:clamp(2rem,6vw,5rem)}.pilot-access-card header,.pilot-access-card form{gap:1rem;display:grid}.pilot-access-card h1{max-width:14ch;font-size:clamp(2.2rem,6vw,4rem)}.pilot-access-card input{border:2px solid var(--line-strong);border-radius:var(--radius-small);background:var(--surface-strong);width:100%;min-height:3.5rem;color:var(--ink);letter-spacing:.04em;text-transform:uppercase;padding:.75rem .9rem;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:1rem}.pilot-access-card input:focus{border-color:var(--teal-dark)}.access-form-status{min-height:1.5rem;color:var(--coral);font-weight:750}.task-page,.parent-page{padding-block:clamp(2rem,5vw,4rem) 5rem}.back-link{min-height:2.75rem;color:var(--teal-dark);text-underline-offset:.2rem;align-items:center;margin-bottom:1.25rem;font-weight:800;display:inline-flex}.task-heading,.parent-heading{gap:.8rem;margin-bottom:2rem;display:grid}.task-heading h1,.parent-heading h1{max-width:18ch;font-size:clamp(2.2rem,5vw,4rem)}.progress-block{gap:.5rem;width:min(100%,24rem);margin-top:.5rem;display:grid}.progress-labels{color:var(--ink-soft);justify-content:space-between;font-size:.78rem;font-weight:750;display:flex}.progress-track{background:#d7dedb;border-radius:999px;height:.6rem;overflow:hidden}.progress-track span{border-radius:inherit;background:var(--teal);width:16.66%;height:100%;display:block}.task-layout{grid-template-columns:minmax(0,1fr) minmax(16rem,20rem);align-items:start;gap:1rem;display:grid}.task-card,.support-card,.summary-card,.parent-panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.task-card{box-shadow:var(--shadow);padding:clamp(1.25rem,3.5vw,2rem)}.task-instruction{gap:.7rem;margin-bottom:1.5rem;display:grid}.task-instruction h2{font-size:clamp(1.6rem,3vw,2.3rem)}.lesson-runner{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow);padding:clamp(1rem,3vw,2rem);display:block}.runner-loading{min-height:12rem;color:var(--ink-soft);place-items:center;font-weight:800;display:grid}.runner-toolbar,.runner-actions{flex-wrap:wrap;align-items:center;gap:.75rem;display:flex}.runner-toolbar{justify-content:space-between;margin-bottom:1.25rem}.runner-back,.review-link,.hint-button{min-height:2.75rem;color:var(--teal-dark);cursor:pointer;text-underline-offset:.2rem;background:0 0;border:0;padding:.55rem .75rem;font-weight:850;text-decoration:underline;text-decoration-thickness:.1rem}.runner-back:disabled{color:var(--ink-soft);cursor:default;opacity:.55;text-decoration:none}.runner-position{color:var(--ink-soft);justify-content:space-between;gap:1rem;font-size:.82rem;font-weight:750;display:flex}.runner-position strong{color:var(--ink)}.runner-progress{width:100%;margin-block:.55rem 1.75rem}.runner-progress span{width:0;transition:width .18s}.runner-step{gap:1.25rem;display:grid}.runner-step[hidden]{display:none}.runner-step-heading{gap:.6rem;max-width:48rem;display:grid}.runner-step-heading h2,.runner-finish h2{font-size:clamp(1.75rem,4vw,2.8rem)}.answer-fieldset{border:0;margin:0;padding:0}.answer-fieldset legend{color:var(--ink);margin-bottom:.85rem;font-family:Georgia,Times New Roman,serif;font-size:1.25rem;font-weight:700}.answer-options{gap:.65rem;display:grid}.answer-option{border:2px solid var(--line);border-radius:var(--radius-small);background:var(--surface-strong);min-height:3.4rem;color:var(--ink);cursor:pointer;grid-template-columns:1.25rem 1fr;align-items:center;gap:.75rem;padding:.8rem 1rem;font-weight:700;display:grid}.answer-option:hover,.answer-option:has(input:checked){border-color:var(--teal-dark);background:var(--teal-pale)}.answer-option:has(input:focus-visible){outline:.2rem solid var(--coral);outline-offset:.15rem}.answer-option input{width:1.2rem;height:1.2rem;accent-color:var(--teal-dark)}.explanation-card,.self-check-card,.movement-card{border:1px solid var(--line);border-radius:var(--radius-small);background:#f8faf7;gap:1rem;padding:clamp(1rem,3vw,1.5rem);display:grid}.explanation-card>p{max-width:65ch;color:var(--ink);font-size:1.02rem}.learning-visual{border:1px solid var(--line);border-radius:var(--radius-small);background:var(--surface-strong);margin:0;overflow:hidden}.learning-visual>svg{width:100%;max-height:22rem;display:block}.learning-visual figcaption{border-top:1px solid var(--line);color:var(--ink);padding:.75rem 1rem;font-size:.9rem;font-weight:700}.learning-visual .symbol-wire,.learning-visual .symbol-source line,.learning-visual .symbol-lamp circle,.learning-visual .symbol-lamp path,.learning-visual .unused-line,.symbol-link-grid svg line,.symbol-link-grid svg circle,.symbol-link-grid svg path{fill:none;stroke:var(--ink);stroke-linecap:round;stroke-linejoin:round;stroke-width:5px;vector-effect:non-scaling-stroke}.symbol-link-grid svg text{fill:var(--ink);font-family:Inter,ui-sans-serif,system-ui,sans-serif;font-size:13px;font-weight:800}.learning-visual .unused-line{stroke:var(--line-strong);stroke-dasharray:8 10}.position-marker circle{fill:var(--amber-pale);stroke:var(--coral);stroke-width:3px}.position-marker text,.visual-label{fill:var(--ink);font-family:Inter,ui-sans-serif,system-ui,sans-serif;font-size:20px;font-weight:900}.position-marker.unused circle{fill:var(--surface);stroke:var(--line-strong)}.symbol-link-grid{grid-template-columns:repeat(4,minmax(0,1fr));display:grid}.symbol-link-grid>div{text-align:center;grid-template-rows:4rem minmax(2.75rem,auto) 5.5rem;place-items:center;gap:.75rem;min-width:0;padding:1rem .75rem;display:grid}.symbol-link-grid>div+div{border-left:1px solid var(--line)}.plain-component{border:2px solid var(--line-strong);min-width:4.5rem;min-height:3rem;color:var(--ink);background:#eef4f0;border-radius:.5rem;place-items:center;font-size:.78rem;font-weight:850;display:grid}.wire-block{background:0 0;border:0;position:relative}.wire-block:after{background:var(--ink);content:"";border-radius:999px;width:4.5rem;height:.3rem}.lamp-block{border-radius:50%}.topology-comparison{gap:.75rem;display:grid}.topology-selector{flex-wrap:wrap;gap:.55rem;display:flex}.topology-selector button{border:2px solid var(--line-strong);background:var(--surface-strong);min-height:3rem;color:var(--ink);cursor:pointer;border-radius:999px;padding:.65rem .9rem;font-weight:800}.topology-selector button[aria-pressed=true]{border-color:var(--teal-dark);background:var(--teal-pale);box-shadow:inset 0 0 0 1px var(--teal-dark)}.topology-comparison>section{gap:.65rem;display:grid}.topology-comparison>section>p{color:var(--ink);font-weight:700}.key-terms{grid-template-columns:repeat(3,minmax(0,1fr));gap:.65rem;margin:0;display:grid}.key-terms>div{border-left:.25rem solid var(--teal);background:var(--surface-strong);padding:.8rem}.key-terms dt{color:var(--ink);font-weight:850}.key-terms dd{color:var(--ink-soft);margin:.2rem 0 0;font-size:.88rem}.movement-card{background:var(--amber-pale);grid-template-columns:auto 1fr;align-items:center}.movement-card span{font-size:2rem;font-weight:900}.movement-card p{color:var(--ink);font-weight:750}.runner-hints{border:1px dashed var(--line-strong);border-radius:var(--radius-small);padding:.75rem 1rem}.hint-copy{border-top:1px solid var(--line);color:var(--ink);padding-block:.65rem}.hint-copy[hidden]{display:none}.runner-feedback{border:2px solid var(--teal);border-radius:var(--radius-small);background:var(--teal-pale);color:var(--ink);padding:1rem;font-weight:750}.runner-feedback[data-result=incorrect]{border-color:var(--coral);background:#fff0eb}.runner-actions{padding-top:.25rem}.review-link{color:var(--ink-soft);font-size:.88rem}.runner-finish{border:1px solid var(--teal);border-radius:var(--radius-small);background:var(--teal-pale);place-content:center;justify-items:start;gap:1rem;min-height:18rem;padding:clamp(1rem,5vw,3rem);display:grid}.runner-finish[hidden]{display:none}.learner-feedback-card{border:1px solid var(--line-strong);border-radius:var(--radius-small);background:var(--surface-strong);gap:1rem;width:min(100%,54rem);padding:clamp(1rem,3vw,1.5rem);display:grid}.feedback-heading{justify-content:space-between;align-items:end;gap:1rem;display:flex}.feedback-heading>div{gap:.35rem;display:grid}.feedback-heading h3{font-size:1.5rem}.feedback-heading>p{max-width:26rem;font-size:.88rem}[data-learner-feedback-form]{grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;display:grid}.feedback-question{border:0;min-width:0;margin:0;padding:0}.feedback-question legend,.feedback-comment>span{color:var(--ink);margin-bottom:.55rem;font-weight:800}.feedback-options{grid-template-columns:repeat(3,minmax(0,1fr));gap:.4rem;display:grid}.feedback-options label{border:2px solid var(--line);border-radius:var(--radius-small);min-height:3rem;color:var(--ink);cursor:pointer;align-items:center;gap:.45rem;padding:.55rem .65rem;font-size:.84rem;font-weight:750;display:flex}.feedback-options label:hover,.feedback-options label:has(input:checked){border-color:var(--teal-dark);background:var(--teal-pale)}.feedback-options label:has(input:focus-visible){outline:.2rem solid var(--coral);outline-offset:.15rem}.feedback-options input{width:1.1rem;height:1.1rem;accent-color:var(--teal-dark);flex:none}.feedback-comment{grid-column:1/-1;display:grid}.feedback-comment small{color:var(--ink-soft);font-weight:600}.feedback-comment textarea{resize:vertical;border:2px solid var(--line);border-radius:var(--radius-small);background:var(--surface);width:100%;min-height:4.5rem;color:var(--ink);padding:.75rem}.feedback-comment textarea:focus{border-color:var(--teal-dark)}.feedback-form-status{color:var(--coral);font-size:.88rem;font-weight:750}.feedback-form-status:empty{display:none}.feedback-thanks{border-radius:var(--radius-small);background:var(--teal-pale);gap:.25rem;padding:1rem;display:grid}.feedback-thanks strong{color:var(--ink)}.runner-save-status{border-top:1px solid var(--line);margin-top:1.25rem;padding-top:.8rem;font-size:.78rem}.circuit-workspace{border-radius:calc(var(--radius) - .2rem);background-color:#eef4f0;background-image:linear-gradient(#0a6b6912 1px,#0000 1px),linear-gradient(90deg,#0a6b6912 1px,#0000 1px);background-size:2rem 2rem;border:1px solid #b8c8c3;place-items:center;min-height:25rem;display:grid;position:relative;overflow:hidden}.workspace-note{border:1px solid var(--line);border-radius:var(--radius-small);text-align:center;background:#fffdf8f0;width:min(100% - 2rem,24rem);padding:1.4rem;box-shadow:0 .5rem 2rem #17303614}.workspace-note strong{margin-bottom:.35rem;font-family:Georgia,Times New Roman,serif;font-size:1.3rem;display:block}.interactive-circuit{border-radius:calc(var(--radius) - .2rem);background:#eef4f0;border:1px solid #b8c8c3;display:grid;overflow:hidden}.circuit-controls{background:var(--surface);border-bottom:1px solid #b8c8c3;gap:.5rem;padding:1rem;display:grid}.circuit-controls fieldset{border:0;min-width:0;margin:0;padding:0}.circuit-controls legend{color:var(--ink);margin-bottom:.65rem;font-weight:850}.circuit-control-list{flex-wrap:wrap;gap:.55rem;display:flex}.circuit-control{border:2px solid var(--line-strong);background:var(--surface-strong);min-height:3rem;color:var(--ink);cursor:pointer;border-radius:999px;align-items:center;gap:.45rem;padding:.65rem .9rem;font-weight:800;display:inline-flex}.circuit-control:before{content:"○";font-size:1.15rem;line-height:1}.circuit-control:hover{border-color:var(--teal-dark)}.circuit-control[aria-pressed=true]{border-color:var(--teal-dark);background:var(--teal-pale);box-shadow:inset 0 0 0 1px var(--teal-dark)}.circuit-control[aria-pressed=true]:before{content:"✓"}.control-note{font-size:.8rem}.circuit-stage{background-image:linear-gradient(#0a6b6912 1px,#0000 1px),linear-gradient(90deg,#0a6b6912 1px,#0000 1px);background-size:2rem 2rem;padding:clamp(.5rem,2vw,1.25rem);overflow-x:auto}.circuit-diagram{width:100%;min-width:34rem;min-height:18rem;color:var(--ink);display:block}.circuit-topology[hidden]{display:none}.circuit-wire,.source-symbol line,.lamp-symbol circle,.lamp-symbol path,.circuit-gap line,.circuit-gap circle{vector-effect:non-scaling-stroke}.circuit-wire,.source-symbol line{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:5px}.source-symbol line:nth-of-type(3),.source-symbol line:nth-of-type(4){stroke-width:6px}.source-symbol text,.lamp-symbol text,.circuit-gap text{fill:var(--ink);font-family:Inter,ui-sans-serif,system-ui,sans-serif;font-size:16px;font-weight:750}.source-symbol text:not(:last-child){font-size:22px;font-weight:900}.circuit-gap circle{fill:var(--surface-strong);stroke:currentColor;stroke-width:3px}.circuit-gap .gap-blade{stroke:currentColor;stroke-linecap:round;stroke-width:5px;transform-origin:0;transition:transform .16s}.circuit-gap[data-gap-state=open]{color:var(--coral)}.circuit-gap[data-gap-state=open] .gap-blade{opacity:0;transform:none}circuit-workspace[data-control-mode=switch] .circuit-gap[data-gap=single] .gap-blade{opacity:1}.circuit-gap[data-gap-state=open] text{fill:var(--coral);font-weight:900}.lamp-symbol circle{fill:var(--surface-strong);stroke:currentColor;stroke-width:4px;transition:fill .16s,filter .16s}.lamp-symbol path{fill:none;stroke:currentColor;stroke-linecap:round;stroke-width:3px}.lamp-symbol[data-powered=true] circle{fill:rgb(255 211 84/calc(.25 + (var(--lamp-brightness,1) * .75)));filter:drop-shadow(0 0 .65rem rgb(214 155 0/calc(var(--lamp-brightness,1) * .55)))}.lamp-state{letter-spacing:.08em;font-weight:900!important}.circuit-announcement{border:1px solid var(--line);border-radius:var(--radius-small);width:fit-content;max-width:44rem;color:var(--ink);text-align:center;background:#fffdf8f0;margin:.25rem auto 0;padding:.65rem .85rem;font-size:.88rem;font-weight:750}.circuit-readings{background:var(--surface);border-top:1px solid #b8c8c3;grid-template-columns:repeat(2,minmax(0,1fr));margin:0;display:grid}.circuit-readings>div{border-right:1px solid var(--line);border-bottom:1px solid var(--line);min-width:0;padding:.8rem 1rem}.circuit-readings>div:nth-child(2n){border-right:0}.circuit-readings dt{color:var(--ink-soft);letter-spacing:.06em;text-transform:uppercase;font-size:.72rem;font-weight:800}.circuit-readings dd{color:var(--ink);margin:.2rem 0 0;font-size:.9rem;font-weight:700}.task-footer{justify-content:space-between;align-items:center;gap:1rem;margin-top:1.25rem;display:flex}.task-footer p{font-size:.84rem}.support-column{gap:1rem;display:grid}.support-card{padding:1.25rem}.support-card h2{letter-spacing:0;margin-bottom:.6rem;font-family:inherit;font-size:1rem}details summary{min-height:2.75rem;color:var(--teal-dark);cursor:pointer;padding-block:.65rem;font-weight:800}details p{border-top:1px solid var(--line);padding-top:.6rem}.guide-page{padding-block:clamp(2.5rem,7vw,5rem)}.guide-hero{justify-content:space-between;align-items:end;gap:2rem;margin-bottom:1.5rem;display:flex}.guide-hero>div{max-width:48rem}.guide-hero h1{max-width:44rem}.guide-section-nav{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);flex-wrap:wrap;gap:.5rem;margin-bottom:1rem;padding:.65rem;display:flex}.guide-section-nav a{min-height:2.75rem;color:var(--teal-dark);border-radius:.5rem;padding:.65rem .9rem;font-weight:800;text-decoration:none}.guide-section-nav a:hover{background:var(--teal-pale)}.guide-section{border-top:1px solid var(--line);grid-template-columns:minmax(14rem,.6fr) minmax(0,1.4fr);gap:clamp(1.5rem,4vw,3rem);padding-block:clamp(2.5rem,6vw,4rem);scroll-margin-top:1rem;display:grid}.guide-section-heading h2,.source-map-section h2{font-size:clamp(1.7rem,3vw,2.35rem)}.guide-copy{gap:1.1rem;display:grid}.guide-copy>h3{margin-top:.75rem;font-size:1.05rem}.source-links{flex-wrap:wrap;gap:.65rem;display:flex}.source-links a{border:1px solid var(--line-strong);min-height:2.75rem;color:var(--teal-dark);border-radius:999px;padding:.65rem .9rem;font-size:.84rem;font-weight:800}.guide-note,.guide-limit{border-left:4px solid var(--teal);background:var(--teal-pale);padding:1rem 1.1rem}.guide-note p{margin-top:.35rem;font-size:.88rem}.model-cases,.data-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:.75rem;display:grid}.model-cases article,.data-grid article{border:1px solid var(--line);border-radius:var(--radius-small);background:var(--surface);padding:1rem}.model-cases strong,.model-cases span{display:block}.model-cases span{color:var(--ink-soft);margin-top:.35rem;font-size:.82rem}.guide-list,.data-grid ul{gap:.45rem;margin:0;padding-left:1.2rem;display:grid}.guide-list li,.data-grid li{padding-left:.2rem}.data-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.data-grid h3{margin-bottom:.7rem;font-size:1rem}.data-grid li{font-size:.84rem}.source-map-section{border-top:1px solid var(--line);padding-top:clamp(2.5rem,6vw,4rem);scroll-margin-top:1rem}.source-map-list{gap:.75rem;display:grid}.source-session{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.source-session>summary{justify-content:space-between;align-items:center;gap:1rem;min-height:4rem;padding:1rem 1.25rem;list-style:none;display:flex}.source-session>summary::-webkit-details-marker{display:none}.source-session>summary:after{content:"+";color:var(--teal);font-size:1.4rem;font-weight:800}.source-session[open]>summary:after{content:"−"}.source-session>summary span:last-child{color:var(--ink-soft);margin-left:auto;font-size:.78rem}.source-activities{border-top:1px solid var(--line);grid-template-columns:repeat(2,minmax(0,1fr));gap:.75rem;padding:0 1rem 1rem;display:grid}.source-activity{border:1px solid var(--line);border-radius:var(--radius-small);background:#fbfcf9;align-content:start;gap:.8rem;padding:1rem;display:grid}.source-activity header>span,.reference-list span{color:var(--teal-dark);letter-spacing:.06em;text-transform:uppercase;font-size:.68rem;font-weight:800;display:block}.source-activity h3{letter-spacing:0;margin-top:.2rem;font-family:inherit;font-size:1rem}.source-activity>div>strong{font-size:.78rem}.source-activity ul{gap:.45rem;margin:.4rem 0 0;padding-left:1.1rem;display:grid}.source-activity li,.source-format-note{color:var(--ink-soft);font-size:.78rem}.source-format-note{border-top:0;padding-top:0}.parent-intro{justify-content:space-between;align-items:end;gap:1.5rem;margin-bottom:2rem;display:flex}.parent-intro .parent-heading{margin-bottom:0}.parent-actions{flex-wrap:wrap;gap:.65rem;display:flex}.parent-sync-status{color:var(--ink-soft);margin:-1rem 0 1.25rem;font-size:.84rem}.parent-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;margin-bottom:1rem;display:grid}.summary-card{min-height:9.5rem;padding:1.25rem}.summary-card span{color:var(--ink-soft);letter-spacing:.08em;text-transform:uppercase;margin-bottom:.7rem;font-size:.78rem;font-weight:800;display:block}.summary-card strong{margin-bottom:.25rem;font-family:Georgia,Times New Roman,serif;font-size:1.65rem;display:block}.parent-layout{grid-template-columns:minmax(0,1.25fr) minmax(17rem,.75fr);gap:1rem;display:grid}.parent-decision,.safety-summary{grid-template-columns:minmax(14rem,.7fr) minmax(0,1.3fr);gap:1.5rem;margin-bottom:1rem;display:grid}.parent-decision h2,.safety-summary h2{font-size:1.45rem}.parent-decision>p:not(.evidence-caution),.safety-summary>p{color:var(--ink);font-size:1rem;font-weight:700}.evidence-caution{color:var(--ink-soft);grid-column:2;font-size:.8rem}.safety-summary .panel-heading{margin-bottom:0}.parent-sessions{margin-top:2.5rem}.parent-sessions-heading{align-items:end}.parent-session-list{gap:1rem;display:grid}.parent-session-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);box-shadow:var(--shadow);padding:clamp(1.25rem,3vw,1.75rem)}.parent-session-header,.parent-session-position{justify-content:space-between;align-items:start;gap:1rem;display:flex}.parent-session-header h3{margin-top:.2rem;font-size:1.4rem}.parent-session-position{border-radius:var(--radius-small);background:var(--teal-pale);align-items:center;margin-top:1rem;padding:1rem}.parent-session-position span{color:var(--ink-soft);letter-spacing:.07em;text-transform:uppercase;margin-bottom:.25rem;font-size:.72rem;font-weight:800;display:block}.parent-session-position strong{display:block}.parent-session-position a,.parent-data-note a{color:var(--teal-dark);font-weight:800}.parent-session-metrics{border-block:1px solid var(--line);grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin:1.25rem 0;display:grid}.parent-session-metrics div{border-left:1px solid var(--line);padding:.9rem 1rem}.parent-session-metrics div:first-child{border-left:0;padding-left:0}.parent-session-metrics dt,.parent-feedback dt{color:var(--ink-soft);letter-spacing:.05em;text-transform:uppercase;font-size:.72rem;font-weight:800}.parent-session-metrics dd,.parent-feedback dd{color:var(--ink);margin:.25rem 0 0;font-weight:800}.parent-evidence-groups{grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;display:grid}.parent-evidence-groups[hidden]{display:none}.parent-evidence-groups section,.parent-feedback{border:1px solid var(--line);border-radius:var(--radius-small);background:#fbfcf9;padding:1rem}.parent-evidence-groups h4,.parent-feedback h4{margin-bottom:.75rem;font-size:.92rem}.parent-evidence-groups ul{gap:.75rem;margin:0;padding:0;list-style:none;display:grid}.parent-evidence-groups li{gap:.15rem;display:grid}.parent-evidence-groups li strong{font-size:.86rem}.parent-evidence-groups li span{color:var(--ink-soft);font-size:.8rem}.parent-feedback{background:var(--amber-pale);margin-top:1rem}.parent-feedback dl{grid-template-columns:repeat(4,minmax(0,1fr));gap:1rem;margin:0;display:grid}.parent-feedback blockquote{border-left:3px solid var(--teal);color:var(--ink);margin:1rem 0 0;padding:.75rem 1rem}.parent-data-note{border:1px dashed var(--line-strong);border-radius:var(--radius-small);grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:1rem;margin-top:1rem;padding:1rem 1.25rem;display:grid}.parent-data-note p{font-size:.8rem}.parent-panel{padding:clamp(1.25rem,3vw,1.75rem)}.panel-heading{justify-content:space-between;align-items:start;gap:1rem;margin-bottom:1.25rem;display:flex}.panel-heading h2{font-size:1.5rem}.session-status-list{gap:0;margin:0;padding:0;list-style:none;display:grid}.session-status-list li{border-top:1px solid var(--line);grid-template-columns:minmax(7rem,.55fr) minmax(0,1fr) auto;align-items:center;gap:1rem;padding-block:1rem;display:grid}.session-status-list li:first-child{border-top:0}.session-status-list strong{font-size:.92rem}.session-status-list p,.session-status-list span{font-size:.82rem}.empty-state{border:1px dashed var(--line-strong);border-radius:var(--radius-small);background:#f8faf7;gap:.65rem;padding:1.25rem;display:grid}.empty-state strong{color:var(--ink)}.site-footer{border-top:1px solid #81939761}.footer-inner{justify-content:space-between;align-items:center;gap:1rem;min-height:5rem;font-size:.78rem;display:flex}.footer-inner p:first-child{color:var(--ink);font-weight:800}}@layer utilities{.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}}@media (width<=56rem){.home-hero,.task-layout,.parent-layout,.access-section{grid-template-columns:1fr}.week-note{align-self:stretch}.support-column{grid-template-columns:repeat(2,minmax(0,1fr))}.parent-grid{grid-template-columns:1fr 1fr}.parent-grid .summary-card:last-child{grid-column:1/-1}.parent-decision,.safety-summary{grid-template-columns:1fr}.evidence-caution{grid-column:1}.guide-section{grid-template-columns:1fr}}@media (width<=40rem){.page-width{width:min(calc(100% - 1.5rem), var(--page-width))}.header-inner{flex-direction:column;align-items:stretch;gap:.75rem;min-height:auto;padding-block:.8rem}.brand{align-self:flex-start}nav{grid-template-columns:1fr 1fr;display:grid}nav a{text-align:center}.home-hero{gap:2rem;padding-block:3rem}.hero-actions,.access-actions,.parent-actions,.parent-intro,.guide-hero,.task-footer,.footer-inner{flex-direction:column;align-items:stretch}.hero-actions .button,.access-actions .button,.parent-intro .button,.parent-actions .button,.task-footer .button{width:100%}.session-grid,.support-column,.parent-grid{grid-template-columns:1fr}.parent-grid .summary-card:last-child{grid-column:auto}.parent-session-header,.parent-session-position,.parent-data-note{flex-direction:column;align-items:stretch}.parent-session-position a{align-self:flex-start}.parent-session-metrics,.parent-evidence-groups,.parent-feedback dl,.model-cases,.data-grid,.source-activities{grid-template-columns:1fr}.guide-section-nav{grid-template-columns:1fr 1fr;display:grid}.guide-section-nav a{text-align:center}.source-session>summary{align-items:start}.parent-session-metrics div,.parent-session-metrics div:first-child{border-top:1px solid var(--line);border-left:0;padding:.75rem 0}.parent-session-metrics div:first-child{border-top:0}.parent-data-note{display:flex}.section-heading{flex-direction:column;align-items:start}.session-card{min-height:15rem}.circuit-workspace{min-height:19rem}.runner-toolbar,.runner-position,.runner-actions{flex-direction:column;align-items:stretch}.runner-toolbar .button,.runner-actions .button,.runner-actions .review-link{width:100%}.runner-position{gap:.2rem}.feedback-heading{flex-direction:column;align-items:start}[data-learner-feedback-form]{grid-template-columns:1fr}.feedback-comment{grid-column:auto}.feedback-options,.key-terms{grid-template-columns:1fr}.symbol-link-grid{grid-template-columns:1fr 1fr}.symbol-link-grid>div+div{border-left:0}.symbol-link-grid>div:nth-child(2n){border-left:1px solid var(--line)}.symbol-link-grid>div:nth-child(n+3){border-top:1px solid var(--line)}.circuit-control-list{display:grid}.circuit-control{justify-content:flex-start;width:100%}.circuit-diagram{min-width:0;min-height:0}.circuit-diagram .source-symbol text,.circuit-diagram .lamp-symbol text,.circuit-diagram .circuit-gap text{font-size:22px}.circuit-readings{grid-template-columns:1fr}.circuit-readings>div,.circuit-readings>div:nth-child(2n){border-right:0}.session-status-list li{grid-template-columns:1fr auto}.session-status-list li p{grid-area:2/1/auto/-1}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}.button:hover{transform:none}}