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i{width:7px;height:10px}}:root.art-r4{--art-blue:#1479b8;--art-ink:#143b61;--art-orange:#f46b27;--art-yellow:#ffd344;--art-white:#fff;--ink:#143b61;--academy-paper:#fff;--academy-ink:#143b61;--academy-teal:#1479b8;--academy-gold:#ffd344}html.art-r4 body{color:var(--art-ink)}html.art-r4 button,html.art-r4 a,html.art-r4 input,html.art-r4 select{touch-action:manipulation}html.art-r4 button:focus-visible,html.art-r4 a:focus-visible{outline-offset:3px;outline:4px solid #143b61}html.art-r4 :is(button,.academy-card),html.art-r4 .academy-home .welcome button,html.art-r4 .academy-home .card-action,html.art-r4 #math-lesson button{border-radius:8px!important}html.art-r4 #math-lesson[data-phase=subtract] .dispatch-controls button[data-dispatch]{color:#143b61!important;background:#fff!important;border-color:#1479b8!important;box-shadow:0 3px #105781!important}html.art-r4 #math-lesson .dispatch-seats .passenger-face{object-fit:contain;width:100%;height:100%;max-height:36px;display:block}html.art-r4 #math-lesson .dispatch-seats .occupied{background:#fff;justify-content:center;align-items:center;display:flex;overflow:hidden}html.art-r4 #math-lesson .dispatch-coupler{writing-mode:vertical-rl;letter-spacing:2px;white-space:nowrap;font-size:11px}html.art-r4 .academy-home .card-action,html.art-r4 #academy-start,html.art-r4 #safety-begin,html.art-r4 #safety-next,html.art-r4 #safety-finish,html.art-r4 #start,html.art-r4 #start-button,html.art-r4 .child-action,html.art-r4 #math-lesson .dispatch-controls button:last-child{color:#0b2942!important}html.art-r4 .done-button{min-height:60px}@media (width<=1100px),(hover:none){html.art-r4 .key-help,html.art-r4 kbd{display:none!important}}html.art-r4 .academy-nav{height:calc(64px + env(safe-area-inset-top,0px));min-height:64px}html.art-r4 body.academy-game{--academy-nav-height:calc(64px + env(safe-area-inset-top,0px))}html.art-r4 body[data-game=train] .child-console>button,html.art-r4 .academy-nav a{border-radius:8px!important}@media (width<=600px){html.art-r4 .academy-nav .passport-open{flex-direction:column;gap:0;min-width:60px;padding:0 3px}html.art-r4 .academy-nav .passport-open img{width:24px;height:24px}}html.art-r4 body:not([data-game]){background:#73c9f3 url(../art/r4/coast.webp) 50%/cover no-repeat fixed}html.art-r4 .sky-decor{display:none}html.art-r4 .academy-home{grid-template-rows:82px minmax(240px,.95fr) 64px minmax(230px,1fr);gap:12px;max-width:1320px;height:100dvh;min-height:568px;padding:0 24px 18px}html.art-r4 .home-header{gap:12px;height:82px;min-height:0}html.art-r4 .academy-brand{letter-spacing:0;gap:8px;min-width:0}html.art-r4 .academy-brand .academy-mark{width:56px;height:56px;box-shadow:none;border-radius:18px}html.art-r4 .brand-wordmark{object-fit:contain;width:170px;height:72px;display:block}html.art-r4 .academy-brand small{display:none}html.art-r4 .header-tools{gap:10px}html.art-r4 .header-tools button,html.art-r4 .header-tools .star-shelf{border:2px solid var(--art-blue);min-height:60px;color:var(--art-ink);background:#fff;border-radius:20px;box-shadow:0 4px #105781}html.art-r4 .passport-open{justify-content:center;align-items:center;gap:6px;display:inline-flex}html.art-r4 .passport-open img{object-fit:contain;width:30px;height:30px}html.art-r4 .header-tools #music-toggle{background:var(--art-yellow);min-width:60px}html.art-r4 .header-tools #home-settings{background:#fff;padding:0 16px;font-size:14px}html.art-r4 .header-tools .passport-open{background:var(--art-yellow);color:#143b61;border-color:#ba7d15}html.art-r4 .header-tools .star-shelf{box-shadow:none;gap:6px;padding:0 12px}html.art-r4 .star-shelf img{object-fit:contain;width:38px;height:38px}html.art-r4 .star-shelf strong{color:#143b61}html.art-r4 .academy-mission{background:0 0;border:0;border-radius:0;grid-template-columns:minmax(0,1fr) minmax(180px,.6fr);align-items:stretch;gap:20px;padding:0;display:grid;position:relative}html.art-r4 .mission-sign{border:3px solid var(--art-blue);background:#ffffffef;border-radius:28px;align-self:center;padding:18px 22px 16px;position:relative;overflow:hidden;box-shadow:0 6px #105781,0 8px 20px #143b6120}html.art-r4 .mission-sign:before{content:"";pointer-events:none;background:#fff url(../art/r4/panel.png) 50%/cover no-repeat;height:12px;display:block;position:absolute;top:0;left:0;right:0}html.art-r4 .coach-intro{letter-spacing:2px;color:#1479b8;margin:2px 0 7px;font-size:13px;font-weight:900}html.art-r4 .academy-mission h1{letter-spacing:0;color:var(--art-ink);text-shadow:none;margin:0 0 8px;font-size:clamp(22px,2.5vw,32px);line-height:1.25}html.art-r4 #academy-story{color:var(--art-ink);font-size:15px;line-height:1.5}html.art-r4 #academy-route{color:#346184;margin:10px 0 6px;font-size:12px}html.art-r4 #academy-record{color:#143b61;margin:5px 0 10px;font-size:13px}html.art-r4 #academy-start{background:var(--art-orange);color:#143b61;text-align:left;border:2px solid #b9430d;border-radius:18px;grid-area:auto;justify-content:space-between;align-items:center;width:100%;min-width:60px;min-height:64px;padding:10px 18px;font-size:19px;display:flex;box-shadow:0 4px #b9430d}html.art-r4 #academy-start:after{content:"→";padding-left:8px;font-size:27px}html.art-r4 .coach-stage{isolation:isolate;justify-content:center;align-items:center;min-height:0;display:flex;position:relative}html.art-r4 .coach-stage>img{object-fit:contain;filter:drop-shadow(0 8px 1px #143b6124);max-width:100%;height:96%;position:absolute;bottom:8%}html.art-r4 .coach-name{color:#143b61;white-space:nowrap;background:#fff;border:3px solid #1479b8;border-radius:18px;padding:5px 18px 6px;font-size:14px;font-weight:900;position:absolute;bottom:0}html.art-r4 .welcome{align-items:stretch;gap:12px}html.art-r4 .welcome button{justify-content:center;align-items:center;gap:8px;display:flex;border:3px solid var(--art-blue)!important;color:#143b61!important;background:#fff!important;border-radius:20px!important;min-height:60px!important;padding:4px 16px!important;font-size:16px!important;box-shadow:0 4px #105781!important}html.art-r4 .welcome button:before{content:"";background:50%/contain no-repeat;flex-shrink:0;width:42px;height:42px}html.art-r4 .welcome #safety-start:before{background-image:url(../art/r4/signal.png)}html.art-r4 .welcome #math-practice:before{background-image:url(../art/r4/train.png)}html.art-r4 .vehicle-gallery{grid-template-rows:1fr;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;min-height:0;display:grid}html.art-r4 .academy-card{background:#fff;border:3px solid #1479b8;border-radius:24px;grid-template-columns:44% minmax(0,1fr);min-height:0;transition:transform .15s;display:grid;overflow:hidden;box-shadow:0 6px #105781}html.art-r4 .academy-card:hover{transform:translateY(-3px)}html.art-r4 .academy-card:active{transform:translateY(3px);box-shadow:0 2px #105781}html.art-r4 .card-image{background:#b4dbef;border-right:2px dashed #1479b8;flex:none;min-width:0;min-height:0;position:relative}html.art-r4 .card-image img{object-fit:cover;filter:none;width:100%;height:100%;object-position:center!important}html.art-r4 .card-image:after{display:none}html.art-r4 .card-image .vehicle-symbol{background:#fff;border:2px solid #1479b8;border-radius:18px;width:60px;height:60px;padding:3px;animation:none;display:block;position:absolute;top:8px;left:8px;box-shadow:0 3px #105781}html.art-r4 .vehicle-symbol img{filter:none;object-fit:contain!important}html.art-r4 .card-stars{box-shadow:none;background:#fff;border:2px solid #e7a71f;padding:4px 8px;font-size:13px;inset:auto auto 9px 8px}html.art-r4 .card-copy{flex-direction:column;justify-content:center;align-items:stretch;min-width:0;padding:14px 12px;display:flex}html.art-r4 .card-english{letter-spacing:1px;color:#1479b8;font-size:12px;font-weight:900}html.art-r4 .card-copy h2{color:#143b61;letter-spacing:0;margin:5px 0 7px;font-size:26px;line-height:1.25}html.art-r4 .card-copy p{color:#346184;margin:0 0 12px;font-size:13px;line-height:1.5}html.art-r4 .card-action{text-shadow:none;background:#f46b27;border:2px solid #b9430d;border-radius:16px;justify-content:space-between;gap:4px;min-height:60px;padding:0 10px;font-size:16px;box-shadow:0 4px #b9430d;color:#143b61!important}html.art-r4 .card-action b{font-size:22px}html.art-r4 #math-lesson{color:#143b61;background:#fff;border:3px solid #1479b8;border-radius:26px;width:min(1040px,100vw - 16px);height:min(790px,100dvh - 16px)}html.art-r4 #math-lesson::backdrop,html.art-r4 #passport-dialog::backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#143b6173}html.art-r4 .dispatch-top{color:#143b61;background:#fff;border-bottom:3px solid #1479b8;padding:2px 8px}html.art-r4 .dispatch-body{background:linear-gradient(#ffffffed 0 8%,#ffffffba 50%,#ffffff20),url(../art/r4/coast.webp) bottom/cover;flex-direction:column;justify-content:center;padding:12px 24px;display:flex;position:relative}html.art-r4 .dispatch-route{flex-shrink:0}html.art-r4 .dispatch-route [aria-current]{color:#b9430d}html.art-r4 .dispatch-instruction{color:#143b61;max-width:720px;margin:4px auto}html.art-r4 .dispatch-train{width:100%;max-width:850px;min-height:100px;margin:20px auto}html.art-r4 .dispatch-carriage{background:#d4f0ff;border:3px solid #1479b8;border-radius:22px;padding:14px 14px 0;box-shadow:0 5px #105781}html.art-r4 .dispatch-carriage.rear{background:#ffe4bf;border-color:#bb4e17;box-shadow:0 5px #bb4e17}html.art-r4 .dispatch-carriage h2{color:#143b61}html.art-r4 .dispatch-carriage strong{font-size:36px}html.art-r4 .dispatch-seats span{color:#1479b8;border:2px solid #1479b8;border-radius:11px;font-size:28px;line-height:38px}html.art-r4 .dispatch-seats .empty{color:#346184;background:#ffffffb8}html.art-r4 .dispatch-wheels{color:#143b61;font-size:24px;line-height:28px}html.art-r4 .dispatch-equation{color:#143b61}html.art-r4 .dispatch-feedback{color:#143b61;background:#ffffffc9;border-radius:12px;padding:5px}html.art-r4 .dispatch-controls{background:#fff;border-top:3px solid #1479b8;gap:10px;padding:10px}html.art-r4 #math-lesson button{color:#143b61;border:2px solid #1479b8;border-radius:16px;min-height:60px;box-shadow:0 3px #105781}html.art-r4 #math-lesson .dispatch-controls button:last-child{color:#143b61;box-shadow:0 3px #b9430d;background:#f46b27!important;border-color:#b9430d!important}html.art-r4 .dispatch-coach{background:#fff;border:2px solid #1479b8;border-radius:22px;justify-content:center;align-items:center;gap:12px;max-width:500px;margin:4px auto 0;padding:6px 18px;font-size:14px;font-weight:800;display:flex}html.art-r4 .dispatch-coach img{object-fit:contain;width:70px;height:90px}html.art-r4 .math-save{color:#143b61;background:#ffffffbf;border-radius:10px;align-self:center;padding:4px 10px}html.art-r4 #passport-dialog{color:#143b61;background:#fff;border:4px solid #1479b8;border-radius:26px;padding:20px;box-shadow:0 8px #105781}html.art-r4 .passport-header>div{background:url(../art/r4/badge.png) 0/64px 64px no-repeat;flex-direction:column;justify-content:center;min-height:64px;padding-left:76px;display:flex}html.art-r4 .passport-open{color:#143b61;background:#ffd344;border:2px solid #1479b8;border-radius:16px}html.art-r4 #passport-close{color:#143b61;background:#d4f0ff;border:2px solid #1479b8;border-radius:18px}html.art-r4 .passport-tabs button{color:#143b61;border:2px solid #1479b8;border-radius:16px}html.art-r4 .passport-tabs button[aria-pressed=true]{color:#fff;background:#1479b8;border-color:#105781}html.art-r4 .passport-chapter{color:#143b61;background:#f1faff;border:2px solid #1479b8;border-left:10px solid #f46b27;border-radius:16px}html.art-r4 .passport-chapter:disabled{color:#527089;background:#f1f4f7;border-color:#a8c2d4}html.art-r4 .passport-rating{color:#8a5d00}html.art-r4 .journey-result button{color:#143b61;background:#ffd344;border-color:#1479b8;border-radius:16px}html.art-r4 #safety-lesson{color:#143b61;background:#cfeeff url(../art/r4/coast.webp) 50%/cover}html.art-r4 #safety-lesson button{color:#143b61;background:#fff;border:2px solid #1479b8;border-radius:18px;box-shadow:0 3px #105781;min-height:60px!important}html.art-r4 .safety-header{border-color:#1479b8}html.art-r4 .safety-header>span{background:#fff;border-radius:16px;padding:10px 18px}html.art-r4 .safety-route span{color:#143b61;background:#fff;border:2px solid #1479b8;border-radius:12px}html.art-r4 .safety-route [aria-current=true]{color:#fff;background:#1479b8}html.art-r4 .safety-scene{border:3px solid #1479b8;border-radius:24px;box-shadow:0 5px #105781}html.art-r4 .safety-scene-caption{color:#143b61;background:#fff;border:2px solid #1479b8;border-radius:12px}html.art-r4 .safety-signal{color:#143b61;background:#ffffffed}html.art-r4 .safety-signal progress{accent-color:#1479b8}html.art-r4 .safety-work{background:#fff;border:3px solid #1479b8;border-radius:26px;padding:22px;box-shadow:0 5px #105781}html.art-r4 .safety-coach{object-fit:contain;float:right;width:76px;height:100px;margin:-14px 0 5px 8px}html.art-r4 #safety-step{color:#1479b8}html.art-r4 #safety-hint{color:#143b61}html.art-r4 #safety-lesson .safety-controls #safety-begin,html.art-r4 #safety-lesson .safety-controls #safety-next,html.art-r4 #safety-lesson .safety-controls #safety-finish{color:#143b61;background:#f46b27;border-color:#b9430d;box-shadow:0 3px #b9430d}html.art-r4 #safety-paused{background:#e8f7fff5}html.art-r4 #safety-brake[aria-pressed=true]{background:#ffd344}html.art-r4 .academy-nav{color:#143b61;background:#fff;border-bottom:3px solid #1479b8}html.art-r4 .academy-nav a{color:#143b61;border-radius:12px;gap:5px}html.art-r4 .academy-nav a img{object-fit:contain;width:30px;height:30px}html.art-r4 .academy-nav a[aria-current]{background:#d4f0ff}html.art-r4 .academy-nav .passport-open{color:#143b61;background:#ffd344;border-color:#1479b8}html.art-r4 body[data-game]{--ink:#143b61;--muted:#346184;--paper:#fff;--lime:#ffd344;color:#143b61}html.art-r4 body[data-game=car]:not(.driving) .vignette{background:linear-gradient(90deg,#eefafff0 0%,#eefaffc9 22%,#0000 60%),linear-gradient(#0000 62%,#d4f0ff9e)}html.art-r4 body[data-game=car] .vehicle-panel,html.art-r4 body[data-game=car] .trip-panel{background:#ffffffed;border:3px solid #1479b8;border-radius:22px;box-shadow:0 4px #105781}html.art-r4 body[data-game=car] .vehicle-choice{color:#143b61;background:#e4f5ff;border-radius:12px}html.art-r4 body[data-game=car] .vehicle-choice.selected{background:#fff4c0;border:2px solid #1479b8}html.art-r4 .start-button,html.art-r4 body[data-game=car] .primary{border:2px solid #b9430d;border-radius:16px;box-shadow:0 4px #b9430d;color:#143b61!important;background:#f46b27!important}html.art-r4 body[data-game=car] .map-card.selected{border-color:#1479b8}html.art-r4 body[data-game=car] .title-outline{color:#1479b8;-webkit-text-stroke:0}html.art-r4 body[data-game=car] .topbar{border-color:#1479b8}html.art-r4 body[data-game=train] .masthead,html.art-r4 body[data-game=train] .coach{color:#143b61;background:#fff;border-color:#1479b8}html.art-r4 body[data-game=train] .child-console{color:#143b61;background:#d4f0ff;border-top:3px solid #1479b8}html.art-r4 body[data-game=train] .child-console>button{color:#143b61;border:2px solid #1479b8;border-radius:18px;box-shadow:0 4px #105781}html.art-r4 body[data-game=train] .child-console .child-note,html.art-r4 body[data-game=train] .child-console .child-note button{color:#143b61}html.art-r4 body[data-game=train] .coach-label{flex-direction:row;align-items:center;gap:8px}html.art-r4 .coach-avatar{object-fit:contain;width:48px;height:58px}html.art-r4 body[data-game=train] .coach-next{outline-color:#f46b27!important;animation:none!important}html.art-r4 body[data-game=train] .rail-mark{color:#fff;background:#1479b8}html.art-r4 body[data-game=train] .coach p,html.art-r4 body[data-game=flight] #menu{color:#143b61}html.art-r4 body[data-game=flight] .dispatch-card{color:#143b61;background:#fff;border:3px solid #1479b8;border-radius:26px;box-shadow:0 6px #105781}html.art-r4 body[data-game=flight] .dispatch-card :is(h2,p,legend,label,strong,small,summary,.dispatch-title,.eyebrow,.select-row,.learning-note){color:#143b61}html.art-r4 body[data-game=flight] .dispatch-card :is(button,select){color:#143b61;background:#e4f5ff;border:2px solid #1479b8;border-radius:14px}html.art-r4 body[data-game=flight] .dispatch-card .selected{color:#143b61;background:#ffd344;border-color:#b67f00}html.art-r4 body[data-game=flight] #start{color:#143b61;background:#f46b27;border:2px solid #b9430d;border-radius:16px;box-shadow:0 4px #b9430d}html.art-r4 body[data-game=flight] #menu .brand{color:#143b61}html.art-r4 body[data-game=flight] #menu .brand h1{color:#143b61;text-shadow:0 2px 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