/* Layout: one centred exercise-book card, one question at a time; results as a grade ruler per subject */
:root{
  --paper:#EEF4FA; --card:#FFFFFF; --ink:#1D2B53; --muted:#5A6B8C; --line:#D5E1EE;
  --pencil:#F2B300; --pencil-ink:#1D2B53; --good:#1F8A55; --good-bg:#E3F4EA; --bad:#C63D52; --bad-bg:#FBE6EA;
  --band:#FFF3C7;
  --blue:#2F6FDB; --berry:#D2437A; --leaf:#1F9D63; --sun:#E08A00;
  --display:"Baloo 2","Trebuchet MS",system-ui,sans-serif;
  --body:"Atkinson Hyperlegible",Verdana,system-ui,sans-serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  color-scheme:dark;--paper:#0F1626;--card:#18223A;--ink:#E7EEF8;--muted:#9AABC8;--line:#2B3A5A;
  --pencil:#F5C23A;--pencil-ink:#1A1400;--good:#4CC98A;--good-bg:#173A2B;--bad:#F07A8C;--bad-bg:#3E1C26;--band:#3A3316;--blue:#5B8FF0;--berry:#EC6A9B;--leaf:#3DBB80;--sun:#F2A433;}}
:root[data-theme="dark"]{
  color-scheme:dark;--paper:#0F1626;--card:#18223A;--ink:#E7EEF8;--muted:#9AABC8;--line:#2B3A5A;
  --pencil:#F5C23A;--pencil-ink:#1A1400;--good:#4CC98A;--good-bg:#173A2B;--bad:#F07A8C;--bad-bg:#3E1C26;--band:#3A3316;--blue:#5B8FF0;--berry:#EC6A9B;--leaf:#3DBB80;--sun:#F2A433;}
*{box-sizing:border-box}
html{padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
[hidden]{display:none!important}
img{max-width:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:18px/1.55 var(--body);padding-inline:16px;padding-block:32px 48px}
.wrap{max-width:640px;margin:0 auto;display:grid;gap:20px}
.card{background:var(--card);border:2px solid var(--line);border-radius:20px;padding:28px 24px;display:grid;gap:18px;
  background-image:linear-gradient(var(--card),var(--card)),repeating-linear-gradient(transparent 0 35px,var(--line) 35px 36px)}
h1,h2{font-family:var(--display);font-weight:800;line-height:1.1;margin:0;text-wrap:balance}
h1{font-size:2.4rem} h2{font-size:1.6rem}
p{margin:0}
.muted{color:var(--muted)}
.eyebrow{font:700 .78rem/1 var(--body);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
label{font-weight:700}
input[type=text]{font:inherit;color:var(--ink);background:var(--paper);border:2px solid var(--line);border-radius:12px;padding:12px 14px;width:100%}
input[type=text]:focus-visible,button:focus-visible{outline:3px solid var(--pencil);outline-offset:2px}
.subjects{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.subjects li{border:2px solid var(--line);border-radius:999px;padding:4px 14px;font-weight:700;font-size:.95rem}
button{font:inherit;cursor:pointer;border:0;border-radius:14px;touch-action:manipulation;-webkit-tap-highlight-color:transparent}
.go{background:var(--pencil);color:var(--pencil-ink);font:800 1.3rem/1 var(--display);padding:16px 28px;justify-self:start;box-shadow:0 4px 0 color-mix(in srgb,var(--pencil) 60%,#000)}
.go:active{transform:translateY(2px);box-shadow:0 2px 0 color-mix(in srgb,var(--pencil) 60%,#000)}
.ghost{background:transparent;color:var(--ink);border:2px solid var(--line);padding:10px 16px;font-weight:700}
.top{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.progress{height:10px;background:var(--line);border-radius:99px;overflow:hidden}
.progress i{display:block;height:100%;background:var(--pencil);transition:width .3s}
.q{font:800 1.9rem/1.2 var(--display)}
.answers{display:grid;gap:12px}
.ans{display:flex;align-items:center;gap:14px;text-align:left;background:var(--paper);color:var(--ink);border:2px solid var(--line);padding:14px 16px;font-size:1.15rem;min-height:60px}
@media (hover:hover){.ans:hover:not(:disabled){border-color:var(--pencil)}}
.ans b{flex:none;display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--card);border:2px solid var(--line);font-family:var(--display)}
.ans.right{background:var(--good-bg);border-color:var(--good)}
.ans.wrong{background:var(--bad-bg);border-color:var(--bad)}
.ans:disabled{cursor:default}
.feedback{font-weight:700;min-height:1.6em}
.feedback.good{color:var(--good)} .feedback.bad{color:var(--bad)}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.results{display:grid;gap:18px}
.subj{display:grid;gap:8px}
.subj-head{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;align-items:baseline}
.subj-head strong{font:800 1.25rem/1.2 var(--display)}
.pill{font-size:.85rem;font-weight:700;border-radius:99px;padding:3px 12px;border:2px solid currentColor}
.pill.ahead{color:var(--good)} .pill.ontrack{color:var(--ink)} .pill.practice{color:var(--bad)}
.ruler{display:grid;grid-template-columns:repeat(5,1fr);border:2px solid var(--line);border-radius:10px;overflow:hidden}
.ruler span{padding:6px 0;text-align:center;font-size:.8rem;font-weight:700;color:var(--muted);border-left:2px solid var(--line);font-variant-numeric:tabular-nums}
.ruler span:first-child{border-left:0}
.ruler span.band{background:var(--band)}
.ruler span.on{background:var(--pencil);color:var(--pencil-ink)}
.small{font-size:.9rem}
.missed{margin:0;padding-left:20px;display:grid;gap:6px}
.score{font:800 3rem/1 var(--display);font-variant-numeric:tabular-nums}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
/* App shell: home dashboard, course paths, lesson end */
.stats{display:flex;gap:10px;flex-wrap:wrap}
.stat{border:2px solid var(--line);border-radius:14px;padding:8px 14px;background:var(--card);display:grid;gap:2px;min-width:0}
.stat b{font:800 1.4rem/1 var(--display);font-variant-numeric:tabular-nums}
.stat span{font-size:.8rem;color:var(--muted);font-weight:700}
.goal{height:8px;background:var(--line);border-radius:99px;overflow:hidden}
.goal i{display:block;height:100%;background:var(--good)}
.course{display:grid;gap:12px}
.course h2{font-size:1.35rem}
.path{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:12px}
.node{width:100%;display:grid;justify-items:center;gap:6px;background:transparent;color:var(--ink);padding:0;text-align:center}
.node .dot{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;font:800 1.4rem/1 var(--display);
  background:var(--paper);border:3px solid var(--line);box-shadow:0 4px 0 var(--line)}
.node small{font-size:.8rem;font-weight:700;line-height:1.25}
.node.done .dot{background:var(--pencil);border-color:var(--pencil);color:var(--pencil-ink);box-shadow:0 4px 0 color-mix(in srgb,var(--pencil) 60%,#000)}
.node.next .dot{border-color:var(--pencil)}
.node:disabled{opacity:.45;cursor:default}
.linkbtn{background:none;color:var(--muted);font-weight:700;text-decoration:underline;padding:4px 0;justify-self:start}
.big{font:800 3.4rem/1 var(--display);font-variant-numeric:tabular-nums}
.hist{border-collapse:collapse;width:100%;font-size:.95rem;font-variant-numeric:tabular-nums}
.hist th,.hist td{text-align:left;padding:8px 10px;border-bottom:2px solid var(--line);white-space:nowrap}
.hist th{font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}

/* Kid mode: everything a child taps is big, coloured and labelled with a shape */
.hero{justify-items:start}
.hero h1{font-size:clamp(2.4rem,7vw,3.4rem)}
.lead{font-size:1.4rem;font-weight:700}
.hero input[type=text]{font-size:1.6rem;padding:16px 18px}
.start{font-size:1.8rem;padding:22px 44px;border-radius:20px}
.wide{justify-self:stretch;font-size:1.5rem;padding:20px}
.quiz .q{font-size:clamp(1.7rem,4.6vw,2.3rem)}
.area{font:800 1.3rem/1 var(--display)}
.listen{justify-self:start;background:var(--paper);color:var(--ink);border:2px solid var(--line);border-radius:99px;padding:10px 20px;font-weight:700;font-size:1.1rem}
.ans{min-height:76px;font-size:1.35rem;font-weight:700;border-width:3px;transition:transform .12s,opacity .2s}
.ans b{width:48px;height:48px;border:0;color:#fff;font-size:1.4rem;background:var(--c)}
.ans.c-blue{--c:var(--blue)} .ans.c-berry{--c:var(--berry)} .ans.c-leaf{--c:var(--leaf)} .ans.c-sun{--c:var(--sun)}
@media (hover:hover){.ans:hover:not(:disabled){border-color:var(--c)}}
.ans:active:not(:disabled){transform:scale(.98)}
.ans.dim{opacity:.4}
.feedback{font-size:1.3rem}
.answers{grid-template-columns:1fr}
@media (min-width:700px){.answers{grid-template-columns:1fr 1fr}}
.dots{list-style:none;margin:0;padding:0;display:flex;gap:8px;flex-wrap:wrap}
.dots li{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font:800 1rem/1 var(--display);border:3px solid var(--line);color:var(--muted);background:var(--card)}
.dots li.done{background:var(--good);border-color:var(--good);color:#fff}
.dots li.now{border-color:var(--pencil);color:var(--ink)}
.exit{background:transparent;color:var(--muted);font-weight:700;border:2px solid var(--line);border-radius:99px;padding:8px 14px;font-size:.95rem}
.parents summary{font:800 1.1rem/1.2 var(--display);cursor:pointer;color:var(--muted)}
.parents[open] summary{color:var(--ink)}
.hint{background:var(--band);border-radius:14px;padding:12px 16px;font-weight:700;font-size:1.15rem}

/* Dew, the guide */
.dew{display:flex;align-items:center;gap:12px}
.dew-img{width:120px;height:120px;flex:none}
.dew.small .dew-img{width:84px;height:84px}
.bubble{position:relative;margin:0;background:var(--paper);border:2px solid var(--line);border-radius:18px;padding:10px 16px;font:800 1.2rem/1.3 var(--display);color:var(--ink)}
.bubble::before{content:"";position:absolute;left:-9px;top:50%;width:14px;height:14px;background:var(--paper);border-left:2px solid var(--line);border-bottom:2px solid var(--line);transform:translateY(-50%) rotate(45deg)}
.qrow{display:flex;align-items:center;gap:12px}
.qrow .q{flex:1;min-width:0}
.bounce .dew-img{animation:dew-hop .5s ease-out}
@keyframes dew-hop{0%{transform:translateY(0)}35%{transform:translateY(-14px) scale(1.04)}70%{transform:translateY(2px) scale(.98,1.02)}100%{transform:none}}
@media (prefers-reduced-motion:reduce){.bounce .dew-img{animation:none}}
.feedback:empty{display:none}
.dew.react{background:var(--paper);border-radius:18px;padding:8px 12px}
.dew.react .dew-img{width:96px;height:96px}
.dew.react .bubble{background:var(--card)}
.dew.react .bubble::before{background:var(--card)}
.dew.tappable .dew-img{cursor:pointer}