@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#173d33;--muted:#6b766f;--bg:#f7f8f2;--paper:#fff;--line:#dce3d9;--lime:#deee8b;--soft:#edf1e7;--orange:#f0b778;--danger:#9e3a29;--shadow:0 12px 40px #183f350a}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.65 'DM Sans',sans-serif}button,input,select{font:inherit}button,a{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-underline-offset:3px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #abbd38;outline-offset:4px}button{color:var(--ink)}header{height:100px;max-width:1480px;margin:auto;padding:0 5%;display:flex;align-items:center;gap:35px;border-bottom:1px solid 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@media(min-width:1500px){main{padding-top:50px}.hero{min-height:390px}h1{font-size:60px}}@media(max-width:1100px){header{gap:20px;padding:0 25px}nav{gap:16px}.scope-button{display:none}.dashboard{grid-template-columns:1fr 250px}.hero{gap:25px}h1{font-size:45px}.stat{padding:0 13px}.lesson-layout{grid-template-columns:220px 1fr;gap:25px}}@media(max-width:800px){header{height:auto;min-height:85px;flex-wrap:wrap;padding:20px 22px 0;gap:12px}.brand{font-size:20px}nav{order:3;width:100%;overflow-x:auto;gap:24px;white-space:nowrap;margin:5px 0 0}nav a{font-size:12px}main{padding:27px 20px 45px}.hero{grid-template-columns:1fr;gap:25px}.hero-art{min-height:260px}.hero-art svg{height:270px}h1{font-size:43px;letter-spacing:-1.6px}.hero p{font-size:14px}.stats-strip{grid-template-columns:repeat(2,1fr);gap:20px;padding:20px;margin:25px 0}.stat:nth-child(2){border:0}.stat strong{font-size:23px}.dashboard{grid-template-columns:1fr}.rail{display:grid;grid-template-columns:1fr 1fr;gap:15px}.rail-card{margin:0}.visual-grid,.fine-grid{grid-template-columns:repeat(2,1fr)}.lesson-layout{grid-template-columns:1fr}.lesson-sidebar{position:static;max-height:220px}.lesson-sidebar h3{margin-top:0}.chapter{padding:24px}.page-heading h1{font-size:34px}.visual-explain{grid-template-columns:1fr}.quiz-card{padding:25px}.quiz-card h2{font-size:21px}.changes{grid-template-columns:1fr}.source-grid{grid-template-columns:1fr}.scope-row{grid-template-columns:1fr;gap:10px}.scope-row .status{justify-self:start}footer{padding:20px;flex-direction:column;gap:7px}.table-scroll{margin-left:-5px;margin-right:-5px}.prose{font-size:14px}}@media(max-width:480px){.courses{grid-template-columns:1fr}.course:first-child{grid-column:span 1;grid-template-columns:45px 1fr;gap:14px}.course:first-child .arrow-circle{display:none}.rail{grid-template-columns:1fr}.visual-grid,.fine-grid{grid-template-columns:1fr}.stat{padding:0 5px;gap:9px}.stat span{font-size:10px}.stat strong{font-size:21px}.course{padding:20px}.section-top{align-items:flex-start}h2{font-size:23px}.hero-art{min-height:240px}.hero-art svg{height:250px}.art-label.top{left:15px;top:15px}.art-label.bottom{right:12px;bottom:12px}.quiz-config{padding:18px}.quiz-config>div,.quiz-config select{width:100%}.quiz-config .btn{width:100%}.lesson-end{flex-direction:column;align-items:stretch}.toolbar .search{min-width:0;width:100%}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}@media print{header,footer,.lesson-sidebar,.actions,.lesson-end,.reading-check{display:none}.lesson-layout{display:block}main{max-width:none;padding:0}.chapter{break-inside:avoid;border:0;padding:15px}.prose{font-size:11px}body{background:white}}

.fine-details{font-size:12px;margin:16px 0}.fine-details summary{cursor:pointer;font-weight:600}.fine-details p{margin:12px 0;overflow-wrap:anywhere}.fine-points{font-size:12px;background:var(--soft);padding:9px;border-radius:6px}.fine-important{background:#f6f1e1;border-radius:6px;padding:10px;margin-top:12px}.fine-card h3{line-height:1.5}.fine-card a{display:inline-block;margin-top:10px}

/* Keep measured bar lengths separate from their readable labels. */
.distance-legend{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px;font-size:13px;font-weight:600}
.distance-legend span{display:inline-flex;align-items:center;gap:7px}
.distance-legend span::before{content:"";width:12px;height:12px;border-radius:3px;flex:none;background:var(--lime)}
.distance-legend .brake-key::before{background:var(--ink)}
.demo .distance-scale{font-size:11px;margin-bottom:22px}
.hero>*,.dashboard>*,.lesson-layout>*,.visual-explain>*,.fine-grid>*,.visual-grid>*{min-width:0}
.prose,.notice,.fine-card,.source-card{overflow-wrap:anywhere}
.signal-row{flex-wrap:wrap}.signal-row button,.filter{min-height:44px}
@media(max-width:800px){nav{flex-wrap:wrap;gap:0 20px;overflow:visible;white-space:normal}nav a{min-height:44px;display:flex;align-items:center}.scope-button{display:block;margin-left:auto}.toolbar select.search{max-width:100%}input[type=search],select.search{font-size:16px}}
@media(max-width:480px){main{padding-left:16px;padding-right:16px}header{padding-left:16px;padding-right:16px}.demo,.chapter{padding:20px}.page-heading h1{font-size:30px}.scope-button{margin-left:0}.section-top{flex-wrap:wrap;gap:10px}.option{min-height:48px}.hero-art .art-label{font-size:10px;padding:8px}.hero-art .art-label small{font-size:9px}.stats-strip{padding:16px}.distance-legend{gap:8px 16px}.btn{min-height:44px}}

.lesson-memory{margin:22px 0 26px;padding:18px;background:#f3f6ed;border:1px solid var(--line);border-radius:12px}
.lesson-memory figcaption{font:700 14px/1.5 Manrope,sans-serif;margin-bottom:14px}
.memory-steps,.memory-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(155px,100%),1fr));gap:10px}
.memory-steps>div,.memory-cards>div{padding:12px;background:white;border:1px solid var(--line);border-radius:9px;min-width:0}
.memory-steps strong,.memory-cards strong{display:block;font-size:13px;margin-bottom:6px}.memory-steps span,.memory-cards div>span:last-child{display:block;font-size:12px;line-height:1.6;color:var(--muted)}
.memory-icon{display:inline-flex!important;align-items:center;justify-content:center;background:var(--soft);color:var(--ink)!important;font-size:20px!important;font-weight:700;min-width:36px;height:36px;border-radius:8px;margin-bottom:9px}
.memory-caption{font-size:12px;line-height:1.7;color:var(--muted);margin:13px 0 0}.vehicle-tree>strong{display:block;text-align:center;padding:10px;margin-bottom:12px;border:1px solid var(--line);border-radius:8px;background:var(--lime)}
.road-cross{display:flex;gap:7px;align-items:stretch;text-align:center;font-size:12px}.road-cross>span{background:#dfe9d6;padding:14px 8px;writing-mode:vertical-rl}.road-cross>div{display:grid;grid-template-columns:1fr 1fr;flex:1;background:#e1e7e1;border-radius:5px;padding:12px 3px}.road-cross>div>span{padding:10px 3px}.road-cross>div>span:first-child{border-right:2px dashed white}.road-cross strong{grid-column:span 2;border-top:2px solid white;padding-top:8px}
.stop-memory{display:flex;align-items:center;gap:12px}.stop-memory>span{padding:13px;background:var(--lime);border-radius:8px;flex:1;font-size:14px;font-weight:700}.stop-memory>span:last-child{background:var(--ink);color:white}.stop-memory small{display:block;font-weight:400;font-size:11px;margin-top:6px}.memory-link{display:inline-block;font-size:12px;margin-top:14px}.roundabout-memory{display:block;width:min(100%,320px);height:auto;margin:auto}.memory-emphasis{font-size:14px;font-weight:700;text-align:center;margin-top:8px}
@media(max-width:480px){.lesson-memory{padding:14px;margin-left:-5px;margin-right:-5px}.memory-steps,.memory-cards{grid-template-columns:1fr}.memory-cards>div{display:grid;grid-template-columns:38px 1fr;gap:0 10px}.memory-cards strong,.memory-cards div>span:last-child{grid-column:2}.memory-icon{grid-row:span 2;margin:0}.stop-memory{flex-wrap:wrap;gap:7px}.stop-memory>span{flex-basis:100%}.stop-memory>b{margin:auto}.memory-caption{font-size:12px}}

.distance-legend{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:18px}
.distance-legend>span{display:block;padding:15px;border:1px solid #b2c596;border-radius:10px;background:#eef4d8;color:#173d33}
.distance-legend>span::before{display:none}.distance-legend>span.brake-key{background:#173d33;color:#fff;border-color:#173d33}
.distance-legend small{display:block;font-size:12px;line-height:1.5;font-weight:500}.distance-legend strong{display:block;font:700 26px/1.4 Manrope,sans-serif;margin:5px 0}
@media(max-width:480px){.distance-legend{gap:8px}.distance-legend>span{padding:12px}.distance-legend small{font-size:11px}.distance-legend strong{font-size:24px}}

/* Official sign details and compact teaching illustrations. */
.lesson-sign-grid,.vehicle-illustrations,.line-illustrations{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.lesson-sign,.vehicle-illustrations>div,.line-illustrations>div{min-width:0;background:white;border:1px solid var(--line);border-radius:10px;padding:14px;text-align:center}
.lesson-sign>svg{display:block;width:100%;height:115px;overflow:hidden;margin:0 auto 12px}.lesson-sign strong,.vehicle-illustrations strong,.line-illustrations strong{display:block;font-size:13px;line-height:1.5}.lesson-sign p,.vehicle-illustrations p,.line-illustrations p{font-size:12px;line-height:1.6;margin:6px 0 0;color:var(--muted)}
.vehicle-illustrations svg{display:block;width:100%;height:85px;margin-bottom:10px}.memory-icon svg{width:30px;height:30px;display:block}
.table-sign-icon{display:inline-block;vertical-align:middle;width:34px;height:34px;margin:2px 9px 2px 0;flex:none}.table-sign-icon svg{display:block;width:100%;height:100%}
#chapter-6 td:first-child{min-width:170px}.prose td:first-child{overflow-wrap:normal;word-break:normal;min-width:100px}
.lesson-signal-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lesson-signal-pair>div{padding:15px;background:white;border:1px solid var(--line);border-radius:10px;text-align:center}.lesson-signal-pair svg{display:block;width:65px;height:125px;margin:0 auto 12px}.lesson-signal-pair strong{display:block;font-size:13px}.lesson-signal-pair p{font-size:12px;margin:8px 0 0;color:var(--muted)}
.road-line{display:block;height:60px;background:#60716c;border-radius:6px;position:relative;margin-bottom:12px}.road-line::before,.road-line::after{content:"";position:absolute;top:28px;left:10px;right:10px;border-top:3px solid white}.road-line.dashed::before{border-top-style:dashed}.road-line.double::before,.road-line.mixed::before{top:23px}.road-line.double::after,.road-line.mixed::after{top:33px}.road-line.mixed::before{border-top-style:dashed}.road-line.solid::after,.road-line.dashed::after{display:none}
@media(max-width:480px){.lesson-sign-grid,.vehicle-illustrations,.line-illustrations{gap:8px}.lesson-sign,.vehicle-illustrations>div,.line-illustrations>div{padding:10px}.lesson-sign>svg{height:90px}.lesson-sign strong{font-size:12px}.lesson-sign p{font-size:11px}.lesson-signal-pair{gap:8px}.lesson-signal-pair>div{padding:12px 8px}}

.crossing-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.crossing-grid>div{padding:12px;border:1px solid var(--line);border-radius:9px;background:white}.crossing-grid svg{display:block;width:100%;height:auto}.crossing-grid strong{display:block;font-size:13px;margin-top:8px}.crossing-grid p{font-size:12px;line-height:1.6;color:var(--muted);margin:7px 0 0}
.question-picture{margin:22px 0;padding:15px;background:#f6f8f2;border:1px solid var(--line);border-radius:12px}.question-picture>svg{display:block;width:min(100%,360px);height:auto;margin:auto}.question-picture figcaption{font-size:12px;line-height:1.7;margin:12px 0 0;color:var(--ink)}.question-picture .lesson-memory{margin:0;padding:0;border:0}.quiz-sign-pair{display:flex;justify-content:center;gap:45px}.quiz-sign-pair>div{text-align:center}.quiz-sign-pair svg{width:100px;height:100px;display:block;margin-bottom:8px}
@media(max-width:600px){.crossing-grid{grid-template-columns:1fr}.crossing-grid>div{display:grid;grid-template-columns:110px 1fr;gap:0 12px;align-items:center}.crossing-grid svg{grid-row:span 2}.crossing-grid strong{margin:0}.crossing-grid p{margin:5px 0 0}.question-picture{padding:10px}.quiz-sign-pair{gap:22px}.quiz-sign-pair svg{width:85px;height:85px}}

.lesson-sign>svg{width:115px;max-width:100%;height:115px}
@media(max-width:480px){.lesson-sign>svg{width:90px;height:90px}}

.table-light-icon{display:inline-flex;gap:4px;vertical-align:middle;background:#293e32;padding:5px;border-radius:5px;margin-right:8px}.table-light-icon i{width:12px;height:12px;border-radius:50%;display:block}

.vehicle-families{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.vehicle-families>div{background:white;border:1px solid var(--line);border-radius:10px;padding:14px}.vehicle-lineup{display:flex;align-items:center;gap:4px;min-height:88px}.vehicle-lineup svg{min-width:0;flex:1;width:50px;height:auto}.vehicle-families strong{display:block;font-size:14px}.vehicle-families p{font-size:12px;line-height:1.7;color:var(--muted);margin:8px 0 0}.road-layout-picture{display:block;width:100%;height:auto;margin:8px 0 12px}
@media(max-width:480px){.vehicle-families{grid-template-columns:1fr}.vehicle-lineup{max-width:300px;margin:auto;min-height:78px}.vehicle-families>div{padding:12px}}

/* One accessible card link, with an explicit, touch-sized action. */
.course>div:last-of-type{display:flex;flex-direction:column;flex:1}.course-meta{gap:12px;align-items:center;flex-wrap:wrap;margin-top:20px;font-size:11px}.course-cta{display:inline-flex;align-items:center;justify-content:center;gap:16px;min-height:44px;padding:10px 17px;border:1px solid var(--ink);border-radius:8px;background:var(--ink);color:white;font-size:13px;font-weight:700;line-height:1.4;white-space:nowrap}.course:hover,.course:focus-visible{border-color:#497862}.course:hover .course-cta,.course:focus-visible .course-cta{background:#285647;border-color:#285647}.course:first-child{grid-template-columns:62px 1fr}
@media(max-width:480px){.course:first-child{grid-template-columns:45px 1fr}.course-meta{align-items:stretch}.course-meta>span:first-child{width:100%}.course-cta{width:100%;min-height:46px}}

.aid-picture-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.aid-picture-grid>div{min-width:0;padding:14px;background:white;border:1px solid var(--line);border-radius:10px}.aid-drawing{display:block;width:120px;max-width:100%;height:105px;margin:0 auto 12px}.aid-picture-grid strong,.aid-age-grid strong{display:block;font-size:14px;line-height:1.5}.aid-picture-grid p{font-size:12px;line-height:1.7;color:var(--muted);margin:7px 0 0}.aid-age-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;text-align:center}.aid-age-grid>div{background:white;border:1px solid var(--line);border-radius:10px;padding:10px}.aid-age-grid svg{display:block;width:100%;height:150px}
@media(max-width:480px){.aid-picture-grid{grid-template-columns:1fr;gap:9px}.aid-picture-grid>div{display:grid;grid-template-columns:85px 1fr;column-gap:12px;padding:12px}.aid-drawing{grid-row:span 2;width:85px;height:80px;margin:auto}.aid-picture-grid strong{align-self:end;font-size:13px}.aid-picture-grid p{margin:6px 0 0}.aid-age-grid{gap:6px}.aid-age-grid>div{padding:7px}.aid-age-grid svg{height:115px}.aid-age-grid strong{font-size:12px}}

/* Independent prototype: the original stopping-distance controls stay intact. */
.braking-lab{grid-column:1/-1;grid-row:1;background:linear-gradient(145deg,#fff,#f4f7eb);padding:28px}.visual-explain>.demo:last-child{grid-column:1/-1;grid-row:2}.braking-lab-badge{display:inline-block;padding:5px 9px;background:#f7e8bd;color:#765b20;border-radius:6px;font-size:10px;font-weight:700;letter-spacing:1px}.braking-lab h3{margin:12px 0 8px;font-size:24px}.braking-lab-heading p{font-size:13px;margin:0;color:var(--muted)}.braking-lab-controls{display:flex;align-items:center;gap:25px;margin:24px 0}.braking-lab-controls>div:first-child{flex:1}.braking-lab-controls label{display:flex;justify-content:space-between;gap:15px;font-size:13px;margin-bottom:10px}.braking-lab-controls label strong{font-size:18px}.braking-lab input[type=range]{min-height:30px}.braking-road-buttons{display:flex;gap:7px;padding:5px;border:1px solid var(--line);border-radius:10px;background:white}.braking-road-buttons button{border:0;padding:11px 15px;background:none;border-radius:7px;font-size:13px;min-height:44px}.braking-road-buttons button[aria-pressed=true]{background:var(--ink);color:white}.braking-stage-legend{padding:0;list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:20px 0 12px}.braking-stage-legend li{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:600}.braking-stage-legend b{background:#dfe9ce;border-radius:50%;width:26px;height:26px;display:grid;place-items:center;flex:none}.braking-stage-legend li:last-child b{background:var(--ink);color:white}.braking-scene{border:1px solid #d9e4d1;border-radius:14px;overflow:hidden;background:#eaf0df}.braking-road{display:block;width:100%;height:auto}.braking-lab.is-wet .braking-scene{background:#e4eef0;border-color:#b5cdd0}.braking-lab.is-wet .braking-road>rect:first-of-type{fill:#e1eced}.braking-lab .braking-scene-caption{font-size:11px;text-align:center;margin:10px 0 20px}.braking-lab-metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.braking-lab-metrics>div{border:1px solid var(--line);border-radius:11px;padding:18px;background:white;min-width:0}.braking-lab-metrics span,.braking-lab-metrics small{display:block;font-size:12px;line-height:1.6}.braking-lab-metrics strong{display:block;font:700 30px/1.4 Manrope,sans-serif;margin:5px 0}.braking-lab-metrics small{color:var(--muted);font-size:11px}.braking-lab-metrics .lab-reaction{background:#edf4d5;border-color:#d5dfa9}.braking-lab-metrics .lab-brake{background:#173d33;color:white;border-color:#173d33}.braking-lab-metrics .lab-brake small{color:#d2e3d9}.braking-lab-metrics .lab-total{background:#f1f4e8}.braking-lab-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:23px}.braking-lab-actions>span{font-size:12px;color:var(--muted);margin-left:auto}.braking-model-note{font-size:12px;margin-top:22px;border-top:1px solid var(--line);padding-top:15px}.braking-model-note summary{cursor:pointer;font-weight:600}.braking-lab .braking-model-note p{font-size:12px;margin:12px 0 0}.braking-lab.is-braking #lab-moving-car{filter:drop-shadow(-4px 0 3px #d2725e88)}
@media(max-width:800px){.visual-explain>.braking-lab,.visual-explain>.demo:last-child{grid-column:auto;grid-row:auto}.braking-lab-controls{flex-wrap:wrap;gap:14px}.braking-lab-controls>div:first-child{flex-basis:100%}.braking-road-buttons{width:100%}.braking-road-buttons button{flex:1}.braking-lab h3{font-size:22px}}
@media(max-width:480px){.braking-lab{padding:20px}.braking-stage-legend{gap:8px}.braking-stage-legend li{flex-direction:column;align-items:flex-start;font-size:11px;line-height:1.5}.braking-lab-metrics{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.braking-lab-metrics>div{padding:13px}.braking-lab-metrics .lab-total{grid-column:1/-1;text-align:center}.braking-lab-metrics strong{font-size:25px}.braking-lab-actions .btn{flex:1;padding:11px 12px;gap:6px}.braking-lab-actions>span{flex-basis:100%;margin:3px 0 0;text-align:center}.braking-lab .braking-scene-caption{font-size:10px}}

.lesson-video-panel{margin-top:26px;padding-top:20px;border-top:1px solid var(--line)}.lesson-video-panel>h3{font-size:17px;margin:0 0 12px}.study-video-note{font-size:12px;line-height:1.7;background:#faf2db;border:1px solid #e6d6a4;border-radius:8px;padding:12px;color:#6d5726;margin:0 0 16px}.study-video-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(220px,100%),1fr));gap:14px}.study-video{min-width:0;max-width:520px;border:1px solid var(--line);border-radius:11px;overflow:hidden;background:white}.study-video-stage{aspect-ratio:16/9;background:#dde7d6;position:relative}.study-video-play{border:0;display:block;width:100%;height:100%;padding:0;position:relative;background:linear-gradient(140deg,#dce6d2,#9bb49f);color:white}.study-video-play[hidden]{display:none}.study-video-play img{display:block;width:100%;height:100%;object-fit:cover}.study-video-triangle{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);display:grid;place-items:center;width:58px;height:42px;background:#173d33ed;border:1px solid #ffffff80;border-radius:10px;font-size:22px;padding-left:3px}.study-video-play:hover .study-video-triangle,.study-video-play:focus-visible .study-video-triangle{background:#285f49}.study-video-tap{position:absolute;bottom:9px;left:50%;transform:translateX(-50%);white-space:nowrap;background:#173d33ed;border-radius:5px;padding:4px 8px;font-size:11px}.study-video-stage iframe{display:block;width:100%;height:100%;border:0;position:absolute;inset:0}.study-video-copy{padding:14px}.study-video-copy h4{font-size:14px;line-height:1.5;margin:8px 0}.study-video-copy p{font-size:11px;line-height:1.6;color:var(--muted);margin:8px 0}.study-video-copy>a{display:inline-flex;align-items:center;min-height:40px;font-size:12px;font-weight:600}.study-video-age{font-size:9px;letter-spacing:.5px;font-weight:700;color:#81612a}.video-archive-list>summary{padding:14px;border:1px solid var(--line);border-radius:8px;cursor:pointer;font-size:14px;font-weight:600;background:var(--soft)}.video-topic-group{margin:24px 0}.video-topic-group>h3{font-size:18px}.video-playlist-source{font-size:11px;color:var(--muted);margin:20px 0 0}
@media(max-width:480px){.study-video-grid{grid-template-columns:1fr}.study-video-note{font-size:11px;padding:10px}.study-video-copy{padding:12px}.study-video-triangle{width:54px;height:40px}}

/* Clear video actions with comfortable touch targets. */
.video-playlist-source{display:flex;flex-wrap:wrap;align-items:center;gap:12px}
.video-playlist-source>a,.study-video-copy>a{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:12px 18px;border:1px solid #173d33;border-radius:9px;background:#173d33;color:#fff;font-size:14px;font-weight:700;line-height:1.5;text-decoration:none;text-align:center;box-sizing:border-box;transition:background .15s}
.video-playlist-source>a:hover,.study-video-copy>a:hover{background:#285f49;border-color:#285f49;color:#fff}
.video-playlist-source>a:focus-visible,.study-video-copy>a:focus-visible{outline:3px solid #64812b;outline-offset:3px}
.study-video-copy>a{width:100%;margin-top:6px}
@media(max-width:600px){.video-playlist-source>a{width:100%}.video-playlist-source>span{display:block;width:100%}}

/* Keep scope and source information visible at every screen size. */
.scope-button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:11px 16px;background:var(--lime);border:1px solid #bbc96e;color:var(--ink);font-size:13px;font-weight:700;text-decoration:none;flex-shrink:0}
.scope-button:hover{background:#d0e477}
@media(min-width:801px) and (max-width:1200px){header{height:auto;min-height:100px;flex-wrap:wrap;padding-top:18px;padding-bottom:12px}header nav{order:3;width:100%;margin:0;justify-content:center;flex-wrap:wrap}.scope-button{margin-left:auto}}
@media(max-width:800px){.scope-button{display:inline-flex;margin-left:auto}}
@media(max-width:480px){.scope-button{width:100%;margin-left:0;order:2}header nav{order:3}}

.junction-lab{grid-column:1/-1;grid-row:2;background:linear-gradient(145deg,#fff,#f4f7eb)}
.visual-explain>.demo:last-child{grid-row:3}
.junction-badge{display:inline-block;background:#e3edc4;color:#355538;padding:5px 9px;border-radius:6px;font-size:10px;font-weight:700;letter-spacing:1px}
.junction-heading h3{font-size:25px;margin:12px 0 6px}.junction-heading>p{font-size:14px;color:var(--muted);margin:0 0 22px}
.junction-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px;align-items:start}.junction-lab .question-picture{margin:0;padding:0;background:none;border:0}.junction-lab .question-picture svg{width:100%;max-width:460px;display:block;margin:auto}.junction-lab figcaption{font-size:12px;color:var(--muted);line-height:1.6;margin-top:12px}
.junction-condition{margin:0 0 18px;font-size:14px;padding:15px;background:#edf1e7;border:1px solid var(--line);border-radius:10px;line-height:1.7}.junction-condition strong{display:block;margin-bottom:5px}.junction-task h4{font-size:17px;margin:0 0 12px}.junction-options{display:grid;grid-template-columns:1fr 1fr;gap:10px}.junction-options button{min-height:50px;padding:10px;border:1px solid #c5d2c2;border-radius:9px;background:#fff;font-size:13px;font-weight:600;text-align:left}.junction-options b{display:inline-grid;place-items:center;width:26px;height:26px;margin-right:4px;border-radius:50%;background:#edf1e7}.junction-options button:hover:not(:disabled){border-color:#173d33;background:#f0f5e9}.junction-options .is-correct{background:#dfedb6;border:2px solid #386543;color:#173d33}.junction-options .is-wrong{background:#fff0ea;border:2px solid #a24933}.junction-options button:disabled{cursor:default;opacity:1}
.junction-feedback{margin-top:16px;padding:14px;border:1px dashed #bdcbb8;border-radius:10px;font-size:13px;color:#52674e;line-height:1.7}.junction-feedback.is-revealed{background:#f1f6e4;border-style:solid;color:#173d33}.junction-feedback p{margin:8px 0;font-size:13px}.junction-order{display:flex;flex-wrap:wrap;gap:9px;align-items:center;font-size:13px;font-weight:700}.junction-order span{padding:5px 9px;background:#deebc2;border-radius:6px}.junction-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.junction-actions .btn{min-height:46px}.junction-actions button:disabled{opacity:.5;cursor:not-allowed}.junction-phase{font-size:12px;min-height:22px;margin:12px 0 0;color:#496443}
@media(max-width:800px){.junction-lab{grid-row:auto;grid-column:auto}.visual-explain>.demo:last-child{grid-row:auto}.junction-layout{grid-template-columns:1fr;gap:20px}.junction-lab .question-picture svg{max-width:380px}}
@media(max-width:480px){.junction-heading h3{font-size:23px}.junction-actions .btn{flex:1;padding:11px 10px}.junction-options button{font-size:12px}.junction-condition{font-size:13px}}

.theme-toggle{display:inline-flex;align-items:center;justify-content:center;min-height:44px;flex-shrink:0;border:1px solid var(--line);border-radius:9px;padding:10px 13px;background:var(--soft);color:var(--ink);font-size:12px;font-weight:700;white-space:nowrap}
@media(min-width:1201px){header{gap:20px;padding-left:3%;padding-right:3%}header nav{gap:20px}}
@media(max-width:800px){.theme-toggle{margin-left:auto;order:1}.scope-button{order:2}header nav{order:3}}
[data-theme="forest"]{--ink:#e6eee7;--muted:#b3c4b9;--bg:#101e19;--paper:#1b2b23;--line:#3d5145;--lime:#d9e993;--soft:#25372d;--shadow:0 12px 40px #0002}
[data-theme="forest"] :is(.chapter,.demo,.course,.stats-strip,.lesson-sidebar,.visual-card,.quiz-card,.quiz-config,.source-card,.fine-card,.change,.study-video,.art-label){background:var(--paper);color:var(--ink)}
[data-theme="forest"] :is(.braking-lab,.junction-lab){background:linear-gradient(145deg,#1b2b23,#213629)}
[data-theme="forest"] :is(.light-card,.teacher-box,.lesson-memory,.memory-cards>div,.search,.filter,.option,.junction-condition,.junction-options button,.video-archive-list>summary){background:var(--soft);color:var(--ink);border-color:var(--line)}
[data-theme="forest"] :is(th,thead){background:#2a3e30;color:var(--ink)}
[data-theme="forest"] tbody tr:nth-child(even){background:#203128}
[data-theme="forest"] :is(.primary,.course-action,.filter.active,.scope-button,.video-playlist-source>a,.study-video-copy>a){background:#d0e58d;color:#14281b;border-color:#b5cc72}
[data-theme="forest"] :is(.rail-card,.lesson-end,.brandmark){background:#284735;color:#f0f5ed}
[data-theme="forest"] :is(.notice,.study-video-note,.fine-important){background:#352e1c;color:#f0dfaf;border-color:#6a5a2e}
[data-theme="forest"] .status{background:#2d4333;color:#d5e9bf}
[data-theme="forest"] .braking-lab-metrics>div{background:#25372d;color:var(--ink);border-color:var(--line)}
[data-theme="forest"] .braking-lab-metrics .lab-reaction{background:#354324;color:#eff5d7}
[data-theme="forest"] .braking-lab-metrics .lab-brake{background:#163f34;color:#f3f8f4}
[data-theme="forest"] .braking-road-buttons button{background:#25372d;color:var(--ink);border-color:var(--line)}
[data-theme="forest"] .braking-road-buttons button[aria-pressed="true"]{background:#d0e58d;color:#14281b;border-color:#b5cc72}
[data-theme="forest"] :is(.junction-feedback,.junction-feedback.is-revealed){background:#253b2b;color:#e2efd8;border-color:#526d47}
[data-theme="forest"] .junction-options .is-correct{background:#40572c;color:#f0f6dc;border-color:#b5d17d}
[data-theme="forest"] .junction-options .is-wrong{background:#4a2c23;color:#ffe7dd;border-color:#d69173}
[data-theme="forest"] :is(.junction-order span,.junction-options b,.junction-badge){background:#394f2b;color:#e7f0d2}
[data-theme="forest"] :is(.junction-phase,.junction-feedback){color:#c6d7bd}
[data-theme="forest"] .memory-emphasis{background:#3c512a;color:#edf4d4}
[data-theme="forest"] a:focus-visible,[data-theme="forest"] button:focus-visible{outline-color:#d9e993}

/* Forest theme: readable content, actions and teaching cards in every state. */
[data-theme="forest"]{--danger:#ffb69c}
[data-theme="forest"] .prose{color:#d7e3da}
[data-theme="forest"] .prose a{color:#d2e99c}
[data-theme="forest"] :is(.prose td,.prose li,.prose p){color:inherit}
[data-theme="forest"] :is(.course-cta,.btn.lime,.lesson-end .btn){background:#d0e58d;color:#14281b;border-color:#b5cc72}
[data-theme="forest"] .course:hover .course-cta,[data-theme="forest"] .course:focus-visible .course-cta{background:#e2f1ae;color:#14281b;border-color:#d0e58d}
[data-theme="forest"] :is(.btn.primary:hover,.scope-button:hover,.video-playlist-source>a:hover,.study-video-copy>a:hover){background:#e2f1ae;color:#14281b;border-color:#d0e58d}
[data-theme="forest"] :is(.aid-picture-grid>div,.aid-age-grid>div,.memory-steps>div,.memory-cards>div,.lesson-sign,.vehicle-illustrations>div,.line-illustrations>div,.lesson-signal-pair>div,.crossing-grid>div,.vehicle-families>div,.scope-row,.quiz-config select,dialog,.skip){background:var(--paper);color:var(--ink);border-color:var(--line)}
[data-theme="forest"] :is(.lesson-memory,.question-picture,.braking-road-buttons){background:var(--soft);color:var(--ink);border-color:var(--line)}
[data-theme="forest"] .junction-lab .question-picture{background:none}
[data-theme="forest"] :is(.aid-picture-grid strong,.aid-age-grid strong,.memory-cards strong,.memory-steps strong,.lesson-sign strong,.vehicle-families strong){color:var(--ink)}
[data-theme="forest"] :is(.notice strong,.study-video-age,.status.pending){color:#f0dfaf}
[data-theme="forest"] .status.pending{background:#44391f}
[data-theme="forest"] .option.correct{background:#304b29;color:#edf7e7;border-color:#a7cc83}
[data-theme="forest"] :is(.option.wrong,.feedback.bad){background:#4a2c23;color:#ffe7dd;border-color:#d69173}
[data-theme="forest"] .option:disabled{color:var(--ink)}
[data-theme="forest"] :is(.vehicle-tree>strong,.stop-memory>span,.braking-stage-legend b){background:#d0e58d;color:#14281b}
[data-theme="forest"] :is(.stop-memory>span:last-child,.braking-stage-legend li:last-child b){background:#294c3b;color:#f0f5ed}
[data-theme="forest"] .road-cross>span{background:#334b35;color:#e6eee7}
[data-theme="forest"] .road-cross>div{background:#34453b;color:#e6eee7}
[data-theme="forest"] #toast{background:#d0e58d;color:#14281b}
[data-theme="forest"] .junction-options button:hover:not(:disabled){background:#344b35;color:#eff6e8;border-color:#a3bc85}
[data-theme="forest"] :is(input,select){accent-color:#c7df8a}

/* Explicit range styling for Chromium/Opera, Safari and Firefox. */
.braking-lab #lab-speed{-webkit-appearance:none;appearance:none;display:block;width:100%;height:44px;min-height:44px;margin:0;padding:0;border:0;border-radius:0;background:transparent;cursor:pointer;--slider-track:#dce4d7;--slider-fill:#245b48;--slider-thumb:#173d33;--slider-ring:#fff}
.braking-lab #lab-speed::-webkit-slider-runnable-track{height:10px;border:1px solid #9eafa1;border-radius:999px;background:linear-gradient(to right,var(--slider-fill) 0%,var(--slider-fill) var(--range-progress,27.27%),var(--slider-track) var(--range-progress,27.27%),var(--slider-track) 100%)}
.braking-lab #lab-speed::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:26px;height:26px;margin-top:-9px;border:3px solid var(--slider-ring);border-radius:50%;background:var(--slider-thumb);box-shadow:0 0 0 2px var(--slider-fill)}
.braking-lab #lab-speed::-moz-range-track{height:8px;border:1px solid #9eafa1;border-radius:999px;background:var(--slider-track)}
.braking-lab #lab-speed::-moz-range-progress{height:8px;border-radius:999px;background:var(--slider-fill)}
.braking-lab #lab-speed::-moz-range-thumb{width:20px;height:20px;border:3px solid var(--slider-ring);border-radius:50%;background:var(--slider-thumb);box-shadow:0 0 0 2px var(--slider-fill)}
.braking-lab #lab-speed:focus-visible{outline:3px solid #6c882b;outline-offset:3px;border-radius:8px}
[data-theme="forest"] .braking-lab #lab-speed{--slider-track:#344c3e;--slider-fill:#c7df8a;--slider-thumb:#d9e993;--slider-ring:#1b2b23}
@media(forced-colors:active){.braking-lab #lab-speed{forced-color-adjust:auto;--slider-track:Canvas;--slider-fill:Highlight;--slider-thumb:Highlight;--slider-ring:Canvas}}