/* Layout: a squared school-notebook page; sticker-like cards with an ink outline and offset shadow */
:root{
  --paper:#F6F9FF; --grid:#DCE6F7; --ink:#1C2554; --ink-2:#56608A; --card:#FFFFFF;
  --edge:#1C2554; --drop:#1C2554;
  --marker:#FFD43B; --pen:#E0464E; --ok:#1F9D63; --blue:#3461E0; --on-blue:#FFFFFF;
  --m0:#3461E0; --m1:#E0464E; --m2:#1F9D63; --m3:#F08C00; --m4:#8E5CF7; --m5:#D6336C;
  --f-display:'Unbounded','Arial Black',system-ui,sans-serif;
  --f-body:'Nunito','Segoe UI',system-ui,sans-serif;
  --r:14px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#11162B; --grid:#1A2140; --ink:#EEF1FC; --ink-2:#A6AED0; --card:#1A2140;
    --edge:#4A5794; --drop:#05070F;
    --marker:#FFD43B; --pen:#FF6B72; --ok:#3CCB8A; --blue:#7B95FF; --on-blue:#0B1030;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --paper:#11162B; --grid:#1A2140; --ink:#EEF1FC; --ink-2:#A6AED0; --card:#1A2140;
  --edge:#4A5794; --drop:#05070F;
  --marker:#FFD43B; --pen:#FF6B72; --ok:#3CCB8A; --blue:#7B95FF; --on-blue:#0B1030;
  color-scheme:dark;
}
*{box-sizing:border-box}
/* the page toggles elements with the hidden attribute; component display rules must not override it */
[hidden]{display:none!important}
html,body{min-height:100%}
body{
  background-color:var(--paper);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:24px 24px;
  color:var(--ink); font-family:var(--f-body); font-size:17px; line-height:1.55;
}
button{font:inherit;color:inherit}
h1,h2,h3{font-family:var(--f-display);line-height:1.2;text-wrap:balance;margin:0}
p{margin:0}
:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
.wrap{max-width:1080px;margin:0 auto;padding-inline:16px}
.muted{color:var(--ink-2)}

/* ---------- header ---------- */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(6px);border-bottom:2px solid var(--edge)}
.top .wrap{display:flex;align-items:center;gap:12px;padding-block:10px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit;font-family:var(--f-display);font-weight:700;font-size:1.05rem;background:none;border:0;padding:0;cursor:pointer}
.brand svg{width:34px;height:34px;flex:none}
.top .sp{flex:1}
.pill{display:inline-flex;align-items:center;gap:6px;border:2px solid var(--edge);border-radius:999px;padding:3px 12px;background:var(--card);font-weight:800;font-variant-numeric:tabular-nums}
.lang{display:inline-flex;border:2px solid var(--edge);border-radius:999px;overflow:hidden;background:var(--card)}
.lang button{border:0;background:none;padding:6px 10px;font-weight:900;font-size:.85rem;cursor:pointer;color:var(--ink)}
.lang button+button{border-left:2px solid var(--edge)}
.lang button.on{background:var(--marker);color:#1C2554}
.icon-btn{border:2px solid var(--edge);background:var(--card);border-radius:999px;width:40px;height:40px;cursor:pointer;font-size:1.1rem;display:grid;place-items:center}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:2px solid var(--edge);border-radius:12px;padding:10px 18px;background:var(--card);font-weight:800;cursor:pointer;box-shadow:3px 3px 0 var(--drop);transition:transform .08s, box-shadow .08s;text-decoration:none}
.btn:hover{transform:translate(-1px,-1px);box-shadow:4px 4px 0 var(--drop)}
.btn:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--drop)}
.btn.primary{background:var(--blue);color:var(--on-blue)}
.btn.marker{background:var(--marker);color:#1C2554}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:3px 3px 0 var(--drop)}
.btn.small{padding:6px 12px;font-size:.92rem}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.row-end{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-end;margin-top:16px}

/* ---------- home ---------- */
main{padding-block:24px 64px}
.hero{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:28px;align-items:center;padding-block:12px 28px}
.hero h1{font-size:clamp(1.7rem,4.2vw,2.8rem);font-weight:800}
.hero h1 mark{background:linear-gradient(transparent 55%,var(--marker) 55%);color:inherit;padding-inline:4px}
.hero p.lead{margin-top:14px;font-size:1.1rem;max-width:34em;color:var(--ink-2)}
.code{font-family:ui-monospace,'SF Mono',Menlo,Consolas,monospace;font-size:.88rem;color:var(--ink-2)}
.code b{color:var(--blue)}
.loop-card{background:var(--card);border:2px solid var(--edge);border-radius:var(--r);box-shadow:var(--shadow, 5px 5px 0 var(--drop));padding:18px;min-width:0}
.loop-card{box-shadow:5px 5px 0 var(--drop)}
.iters{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:12px}
.iter{border:2px dashed color-mix(in srgb,var(--edge) 45%,transparent);border-radius:10px;padding:8px 4px;text-align:center;font-weight:800;line-height:1.15;color:var(--ink-2);background:transparent}
.iter small{display:block;font-weight:600;font-size:.72rem}
.iter.on{border-style:solid;border-color:var(--edge);background:var(--marker);color:#1C2554;box-shadow:2px 2px 0 var(--drop)}
.prog-big{margin-top:14px;display:flex;align-items:center;gap:12px}
.bar{flex:1;height:14px;border:2px solid var(--edge);border-radius:999px;overflow:hidden;background:var(--paper)}
.bar i{display:block;height:100%;background:var(--ok);width:0;transition:width .4s}
.sec-h{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-block:8px 16px;flex-wrap:wrap}
.sec-h h2{font-size:1.35rem}
.topics{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:18px}
.tcard{position:relative;text-align:left;background:var(--card);border:2px solid var(--edge);border-radius:var(--r);padding:16px;cursor:pointer;box-shadow:4px 4px 0 var(--drop);display:flex;flex-direction:column;gap:10px;transition:transform .12s, box-shadow .12s;min-width:0}
.tcard:hover{transform:translate(-2px,-2px) rotate(-.4deg);box-shadow:6px 6px 0 var(--drop)}
.sticker{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;font-size:2rem;background:color-mix(in srgb,var(--tc) 22%,var(--card));border:2px solid var(--tc)}
.tcard .num{position:absolute;top:12px;right:14px;font-family:var(--f-display);font-size:.8rem;color:var(--ink-2)}
.tcard h3{font-size:1.02rem;font-weight:700}
.tcard .meta{display:flex;justify-content:space-between;align-items:center;font-size:.9rem;color:var(--ink-2);font-weight:700;margin-top:auto;font-variant-numeric:tabular-nums}
.stars{color:#E8A400;letter-spacing:1px;white-space:nowrap}
.stars .off{color:color-mix(in srgb,var(--ink-2) 40%,transparent)}
.note{margin-top:32px;font-size:.92rem;color:var(--ink-2);max-width:62em}

/* ---------- topic ---------- */
.crumbs{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-weight:700;color:var(--ink-2);margin-bottom:16px}
.crumbs button{background:none;border:0;padding:0;cursor:pointer;color:var(--blue);font-weight:800;text-decoration:underline;text-underline-offset:3px}
.topic-head{display:flex;gap:18px;align-items:center;margin-bottom:22px;flex-wrap:wrap}
.topic-head .sticker{width:84px;height:84px;font-size:2.7rem}
.topic-head h1{font-size:clamp(1.4rem,3.4vw,2.2rem)}
.topic-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:22px;align-items:start}
.panel{background:var(--card);border:2px solid var(--edge);border-radius:var(--r);box-shadow:4px 4px 0 var(--drop);padding:18px;min-width:0}
.panel h2{font-size:1.1rem;margin-bottom:10px}
.theory-list{margin:10px 0 16px;padding-left:1.3em;color:var(--ink-2);font-weight:600}
.tasks{display:grid;gap:12px}
.task-row{display:flex;align-items:center;gap:14px;text-align:left;width:100%;background:var(--card);border:2px solid var(--edge);border-radius:12px;padding:12px 14px;cursor:pointer;box-shadow:3px 3px 0 var(--drop);transition:transform .08s}
.task-row:hover{transform:translate(-1px,-1px)}
.task-row .ti{width:44px;height:44px;border-radius:10px;display:grid;place-items:center;font-size:1.4rem;background:color-mix(in srgb,var(--tc) 18%,var(--card));flex:none}
.task-row .tt{flex:1;min-width:0}
.task-row .tt b{display:block}
.task-row .tt small{color:var(--ink-2);font-weight:700;text-transform:uppercase;letter-spacing:.06em;font-size:.72rem}
.check{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--ok);color:#fff;font-size:.8rem;font-weight:900}

/* ---------- theory ---------- */
.slide{background:var(--card);border:2px solid var(--edge);border-radius:var(--r);box-shadow:5px 5px 0 var(--drop);padding:clamp(18px,4vw,36px);display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.5fr);gap:28px;align-items:center;min-height:340px}
.slide .pic{font-size:clamp(3rem,9vw,5.5rem);text-align:center;line-height:1.25;background:color-mix(in srgb,var(--tc) 14%,var(--card));border-radius:12px;padding:24px 12px;word-break:break-word}
.slide h2{font-size:clamp(1.2rem,2.8vw,1.6rem);margin-bottom:12px}
.slide p{max-width:62ch}
.slide p + p{margin-top:10px}
.slide ul{margin:10px 0 0;padding:0;list-style:none;display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px 12px;align-items:start}
/* each item's two spans become cells of the list grid, so all rows share one column width */
.slide li{display:contents}
.slide li .e{min-width:1.6em;text-align:center;font-size:1.2em;white-space:nowrap}
.slide ul.kv{gap:0;width:max-content;max-width:100%;border:2px solid color-mix(in srgb,var(--edge) 30%,transparent);border-radius:10px;overflow:hidden}
.slide ul.kv li>span{padding:6px 14px;border-bottom:1px solid color-mix(in srgb,var(--edge) 18%,transparent);overflow-wrap:anywhere}
.slide ul.kv li:last-child>span{border-bottom:0}
/* a first row like “A B” is the table header */
.slide ul.kv.head li:first-child>span{font-weight:900;background:color-mix(in srgb,var(--tc) 24%,var(--card));border-bottom:2px solid color-mix(in srgb,var(--edge) 30%,transparent)}
.slide ul.kv li .e{font-family:ui-monospace,Menlo,Consolas,monospace;font-weight:800;font-size:1rem;text-align:left;letter-spacing:.04em;background:color-mix(in srgb,var(--tc) 12%,var(--card))}
.remember{margin-top:16px;background:var(--marker);color:#1C2554;border:2px solid var(--edge);border-radius:10px;padding:10px 14px;font-weight:800;transform:rotate(-.6deg)}
.slide-nav{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:18px;flex-wrap:wrap}
.dots{display:flex;gap:6px;flex-wrap:wrap}
/* slide dots are buttons: a 12px dot inside a larger tap area */
.dots button{width:22px;height:22px;padding:5px;margin:-3px;border:0;background:none;cursor:pointer;border-radius:50%}
.dots button::before{content:'';display:block;width:12px;height:12px;border-radius:50%;border:2px solid var(--edge);box-sizing:border-box;background:transparent;transition:transform .1s}
.dots button:hover::before{transform:scale(1.25)}
.dots button.seen::before{background:var(--ok)}
.dots button.on::before{background:var(--blue);box-shadow:0 0 0 3px color-mix(in srgb,var(--blue) 30%,transparent)}
.say{background:none;border:2px solid var(--edge);border-radius:999px;padding:4px 12px;cursor:pointer;font-weight:800;font-size:.88rem;margin-top:14px}

/* ---------- task shell ---------- */
.task-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.task-head h1{font-size:clamp(1.25rem,3vw,1.8rem)}
.bit{display:flex;gap:12px;align-items:flex-start;margin-bottom:18px}
.bit-face{flex:none;width:52px;height:52px;border-radius:50%;background:var(--card);border:2px solid var(--edge);display:grid;place-items:center;font-size:1.8rem}
.bubble{position:relative;background:var(--card);border:2px solid var(--edge);border-radius:14px;padding:10px 14px;font-weight:700;max-width:60ch}
.bubble::before{content:"";position:absolute;left:-9px;top:16px;width:14px;height:14px;background:var(--card);border-left:2px solid var(--edge);border-bottom:2px solid var(--edge);transform:rotate(45deg)}
.stage{background:var(--card);border:2px solid var(--edge);border-radius:var(--r);box-shadow:5px 5px 0 var(--drop);padding:clamp(14px,3vw,26px);min-width:0}
.pz-head{display:flex;gap:10px;align-items:center;margin-bottom:12px;flex-wrap:wrap}
.pz-count{font-family:var(--f-display);font-size:.8rem;border:2px solid var(--edge);border-radius:999px;padding:2px 10px;background:var(--marker);color:#1C2554}

/* chips / sort */
.pool{display:flex;flex-wrap:wrap;gap:10px;min-height:56px;padding:12px;border:2px dashed color-mix(in srgb,var(--edge) 40%,transparent);border-radius:12px;margin-bottom:16px}
.chip{display:inline-flex;align-items:center;gap:8px;border:2px solid var(--edge);border-radius:999px;padding:6px 14px 6px 8px;background:var(--card);font-weight:800;cursor:grab;touch-action:none;user-select:none;-webkit-user-select:none;box-shadow:2px 2px 0 var(--drop);text-align:left}
.chip-e{font-size:1.5rem;line-height:1}
.chip.sel{background:var(--marker);color:#1C2554}
.chip.dragging{opacity:.35}
.chip.placed{cursor:default;box-shadow:none;border-color:var(--ok);background:color-mix(in srgb,var(--ok) 14%,var(--card));font-size:.92rem;padding:3px 10px 3px 6px}
.chip.placed .chip-e{font-size:1.15rem}
.ghost{position:fixed;z-index:100;pointer-events:none;transform:rotate(-4deg) scale(1.06);box-shadow:6px 6px 0 var(--drop)}
.buckets{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px}
.bucket{border:2px solid var(--edge);border-radius:12px;padding:10px;min-height:140px;background:color-mix(in srgb,var(--tc) 8%,var(--card));cursor:pointer;transition:background .15s,transform .15s;min-width:0}
.bucket.over{background:color-mix(in srgb,var(--marker) 45%,var(--card));transform:scale(1.02)}
.bucket.good{background:color-mix(in srgb,var(--ok) 30%,var(--card))}
.bucket.bad{background:color-mix(in srgb,var(--pen) 30%,var(--card))}
.bucket-head{display:flex;align-items:center;gap:8px;font-weight:900;margin-bottom:8px;line-height:1.2}
.bucket-ic{font-size:1.7rem}
.bucket-list{display:flex;flex-wrap:wrap;gap:6px}

/* quiz */
.q{display:grid;gap:10px;margin:8px 0 18px}
.q-pic{font-size:clamp(2.2rem,7vw,3.6rem);letter-spacing:.08em;line-height:1.3;word-break:break-word}
.q-text{font-size:1.25rem;font-weight:800;max-width:52ch}
.opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
.opts.big{grid-template-columns:repeat(auto-fit,minmax(130px,1fr))}
.opts.big .opt{font-size:1.15rem;flex-direction:column;text-align:center;padding:16px 10px}
.opts.big .opt .oe{font-size:2.6rem}
.opts.tf{grid-template-columns:repeat(2,minmax(0,1fr))}
.opts.tf .opt{justify-content:center;font-size:1.2rem;padding:18px}
.opt{display:flex;align-items:center;gap:10px;border:2px solid var(--edge);border-radius:12px;padding:12px 16px;background:var(--card);font-weight:800;cursor:pointer;text-align:left;box-shadow:3px 3px 0 var(--drop);transition:transform .08s;min-width:0;white-space:pre-line}
.opt:hover:not(:disabled){transform:translate(-1px,-1px)}
.opt.right{background:color-mix(in srgb,var(--ok) 25%,var(--card));border-color:var(--ok)}
.opt.wrong{background:color-mix(in srgb,var(--pen) 22%,var(--card));border-color:var(--pen);text-decoration:line-through;text-decoration-color:var(--pen)}
.opt:disabled:not(.right){opacity:.55;cursor:default}
.explain{margin-top:14px;padding:10px 14px;border-left:5px solid var(--ok);background:color-mix(in srgb,var(--ok) 10%,var(--card));border-radius:0 10px 10px 0;font-weight:700}
.qdots{display:flex;gap:6px;margin-bottom:6px}
.qdots i{flex:1;max-width:40px;height:8px;border-radius:4px;background:color-mix(in srgb,var(--ink-2) 25%,transparent)}
.qdots i.on{background:var(--blue)}
.qdots i.done{background:var(--ok)}

/* match */
.match{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.mcol{display:grid;gap:10px;align-content:start;min-width:0}
.mitem{border:2px solid var(--edge);border-radius:12px;padding:12px 14px;background:var(--card);font-weight:800;text-align:left;cursor:pointer;box-shadow:2px 2px 0 var(--drop);min-width:0}
.mitem.sel{background:var(--marker);color:#1C2554}
.mitem.done{background:color-mix(in srgb,var(--mc) 22%,var(--card));border-color:var(--mc);box-shadow:none;cursor:default}

/* order */
.slots{list-style:none;counter-reset:s;padding:0;margin:0 0 16px;display:grid;gap:8px}
.slot{counter-increment:s;display:flex;align-items:center;gap:12px;min-height:46px;border:2px dashed color-mix(in srgb,var(--edge) 40%,transparent);border-radius:10px;padding:6px 12px;font-weight:800}
.slot::before{content:counter(s);flex:none;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--paper);border:2px solid var(--edge);font-family:var(--f-display);font-size:.8rem}
.slot.filled{border-style:solid;border-color:var(--ok);background:color-mix(in srgb,var(--ok) 12%,var(--card));animation:pop .3s}
.slot.filled::before{background:var(--ok);color:#fff;border-color:var(--ok)}

/* robot */
.robot{display:grid;grid-template-columns:minmax(0,340px) minmax(0,1fr);gap:22px;align-items:start}
.board{position:relative;display:grid;grid-template-columns:repeat(var(--n),1fr);border:2px solid var(--edge);border-radius:10px;overflow:hidden;aspect-ratio:1;max-width:100%;background:color-mix(in srgb,var(--ok) 10%,var(--card))}
.cell{border-right:1px solid color-mix(in srgb,var(--edge) 25%,transparent);border-bottom:1px solid color-mix(in srgb,var(--edge) 25%,transparent);display:grid;place-items:center;font-size:clamp(1.3rem,5vw,2rem)}
.bot{position:absolute;display:grid;place-items:center;font-size:clamp(1.5rem,6vw,2.4rem);transition:left .3s ease, top .3s ease;z-index:2}
.bot.bump{animation:shake .4s}
.program{display:flex;flex-wrap:wrap;gap:6px;min-height:58px;padding:8px;border:2px dashed color-mix(in srgb,var(--edge) 40%,transparent);border-radius:10px;margin-block:10px;align-items:center}
.cmd{width:42px;height:42px;border:2px solid var(--edge);border-radius:8px;background:var(--card);font-size:1.3rem;font-weight:900;cursor:pointer}
.cmd.now{background:var(--marker);color:#1C2554;transform:scale(1.1)}
.pad{display:grid;grid-template-columns:repeat(3,58px);grid-template-rows:repeat(2,58px);gap:8px}
.arrow{border:2px solid var(--edge);border-radius:12px;background:var(--blue);color:var(--on-blue);font-size:1.6rem;font-weight:900;cursor:pointer;box-shadow:3px 3px 0 var(--drop)}
.arrow:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--drop)}
.a-up{grid-column:2;grid-row:1}.a-left{grid-column:1;grid-row:2}.a-down{grid-column:2;grid-row:2}.a-right{grid-column:3;grid-row:2}
.robot-msg{font-weight:800;min-height:1.6em;margin-top:10px}

/* keyboard */
.target{display:flex;align-items:center;gap:16px;margin-bottom:16px;flex-wrap:wrap}
.target .glyph{min-width:88px;height:88px;padding-inline:16px;border:3px solid var(--edge);border-radius:14px;display:grid;place-items:center;font-family:var(--f-display);font-size:2.6rem;background:var(--marker);color:#1C2554;box-shadow:4px 4px 0 var(--drop)}
.target .glyph.word{font-size:1.3rem}
.kbd-wrap{overflow-x:auto;padding-bottom:6px}
.kbd{display:grid;gap:6px;min-width:560px}
.krow{display:flex;gap:6px}
.key{flex:1;height:46px;border:2px solid var(--edge);border-radius:8px;background:var(--card);font-weight:900;font-size:1.05rem;cursor:pointer;box-shadow:0 3px 0 var(--drop);padding:0 4px;white-space:nowrap}
.key.w2{flex:2}.key.w6{flex:7}
.key.hint{background:color-mix(in srgb,var(--marker) 60%,var(--card));animation:pulse 1s infinite}
.key.good{background:var(--ok);color:#fff}
.key.bad{background:var(--pen);color:#fff}
.krow.off{padding-left:3%}.krow.off2{padding-left:6%}

/* mouse */
.field{position:relative;height:300px;border:2px dashed color-mix(in srgb,var(--edge) 40%,transparent);border-radius:12px;overflow:hidden;background:color-mix(in srgb,var(--blue) 6%,var(--card))}
.balloon{position:absolute;font-size:3rem;background:none;border:0;cursor:pointer;line-height:1;transition:transform .2s}
.balloon.pop{transform:scale(1.8);opacity:0}
.gifts{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:14px}
.gift{font-size:3.4rem;height:120px;border:2px solid var(--edge);border-radius:14px;background:var(--card);cursor:pointer;box-shadow:3px 3px 0 var(--drop);user-select:none;-webkit-user-select:none}
.gift.open{background:color-mix(in srgb,var(--ok) 18%,var(--card));animation:pop .35s}
.basket{margin-top:14px;min-height:130px;border:3px dashed var(--edge);border-radius:16px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:center;font-weight:900;font-size:1.1rem;padding:12px;background:color-mix(in srgb,var(--marker) 14%,var(--card))}
.basket.over{background:color-mix(in srgb,var(--marker) 45%,var(--card))}
.hint-line{min-height:1.6em;font-weight:800;color:var(--pen);margin-top:10px}

/* explorer */
.goal{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:12px;font-weight:800}
.goal .file-tag{border:2px solid var(--edge);border-radius:8px;padding:4px 10px;background:var(--marker);color:#1C2554}
.explorer{border:2px solid var(--edge);border-radius:12px;overflow:hidden}
.ex-bar{display:flex;align-items:center;gap:10px;padding:8px 10px;border-bottom:2px solid var(--edge);background:var(--paper);flex-wrap:wrap}
.ex-path{font-weight:800;font-size:.95rem;min-width:0;overflow-wrap:anywhere}
.ex-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:10px;padding:14px;min-height:200px;align-content:start}
.fitem{display:flex;flex-direction:column;align-items:center;gap:4px;border:2px solid transparent;border-radius:10px;padding:10px 6px;background:none;cursor:pointer;font-weight:800;font-size:.9rem;text-align:center;overflow-wrap:anywhere}
.fitem:hover{border-color:color-mix(in srgb,var(--edge) 40%,transparent);background:color-mix(in srgb,var(--blue) 8%,var(--card))}
.fitem .fi{font-size:2.6rem;line-height:1}
.fitem .ext{color:var(--ink-2);font-weight:600}
.fitem.found{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 18%,var(--card))}

/* paint */
.paint{display:grid;gap:12px}
.tools{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.tool{min-width:44px;height:44px;border:2px solid var(--edge);border-radius:10px;background:var(--card);font-size:1.25rem;cursor:pointer;display:inline-flex;align-items:center;gap:6px;padding:0 8px}
.tool span{font-size:.8rem;font-weight:800}
.tool.on{background:var(--marker);color:#1C2554;box-shadow:inset 0 -3px 0 var(--edge)}
.swatches{display:flex;flex-wrap:wrap;gap:6px}
.sw{width:32px;height:32px;border-radius:50%;border:2px solid var(--edge);cursor:pointer}
.sw.on{outline:3px solid var(--blue);outline-offset:2px}
.canvas-wrap{border:2px solid var(--edge);border-radius:10px;overflow:hidden;background:#fff;max-width:100%}
.canvas-wrap canvas{display:block;width:100%;height:auto;touch-action:none;cursor:crosshair}

/* pixel */
.pixel{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);gap:22px;align-items:start}
.pgrid{display:grid;grid-template-columns:repeat(var(--n),1fr);border:2px solid var(--edge);aspect-ratio:1;max-width:100%;touch-action:none;user-select:none;-webkit-user-select:none}
.pgrid .px{border:1px solid rgba(28,37,84,.15)}
.pgrid.live .px{cursor:pointer}
.pgrid .px.err{outline:3px solid var(--pen);outline-offset:-3px;animation:pulse .6s 2}
.plabel{font-weight:800;margin-bottom:6px;font-size:.9rem;color:var(--ink-2);text-transform:uppercase;letter-spacing:.06em}

/* eyes */
.eyes-field{position:relative;height:320px;border:2px solid var(--edge);border-radius:14px;overflow:hidden;background:color-mix(in srgb,var(--blue) 8%,var(--card))}
.orbit{position:absolute;left:50%;top:50%;width:0;height:0}
.orbit .dot{position:absolute;left:0;top:0;width:46px;height:46px;margin:-23px 0 0 -23px;border-radius:50%;background:var(--pen);border:3px solid var(--edge);box-shadow:0 0 0 8px color-mix(in srgb,var(--pen) 25%,transparent)}
.orbit.lr{animation:lr 1.6s ease-in-out infinite alternate}
.orbit.ud{animation:ud 1.6s ease-in-out infinite alternate}
.orbit.circle{animation:spin 3.2s linear infinite}
.orbit.circle .dot{top:-110px}
.orbit.blink .dot{animation:blink .5s steps(2) infinite}
.orbit.rest .dot{display:none}
.eyes-say{position:absolute;left:0;right:0;top:12px;text-align:center;font-weight:900;font-size:1.1rem;padding-inline:12px}
.eyes-big{position:absolute;inset:0;display:grid;place-items:center;font-size:4rem}

/* result */
.overlay{position:fixed;inset:0;z-index:50;background:color-mix(in srgb,var(--ink) 45%,transparent);display:grid;place-items:center;padding:16px}
.modal{background:var(--card);border:3px solid var(--edge);border-radius:18px;box-shadow:8px 8px 0 var(--drop);padding:28px 24px;max-width:440px;width:100%;text-align:center;animation:pop .35s}
.modal .big-stars{font-size:3rem;letter-spacing:6px}
.modal .big-stars span{display:inline-block;animation:starIn .45s backwards;color:color-mix(in srgb,var(--ink-2) 35%,transparent)}
.modal .big-stars span.on{color:#E8A400}
.modal h2{margin-top:6px;font-size:1.5rem}
.modal p{margin-top:8px;color:var(--ink-2);font-weight:700}
.modal .row{justify-content:center;margin-top:20px}

.shake{animation:shake .4s}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-8px)}40%{transform:translateX(8px)}60%{transform:translateX(-5px)}80%{transform:translateX(5px)}}
@keyframes pop{0%{transform:scale(.85)}60%{transform:scale(1.05)}100%{transform:scale(1)}}
@keyframes pulse{50%{transform:scale(1.08)}}
@keyframes starIn{from{transform:scale(0) rotate(-90deg);opacity:0}}
@keyframes lr{from{left:10%}to{left:90%}}
@keyframes ud{from{top:16%}to{top:88%}}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes blink{50%{opacity:.15}}
@media (prefers-reduced-motion: reduce){
  .tcard,.btn,.task-row{transition:none}
  .shake,.slot.filled,.modal,.gift.open,.key.hint{animation:none}
}

@media (max-width:820px){
  .hero,.topic-grid,.robot,.pixel{grid-template-columns:minmax(0,1fr)}
  .slide{grid-template-columns:minmax(0,1fr);min-height:0}
  .slide .pic{padding:14px}
}
@media (max-width:520px){
  body{font-size:16px}
  .match{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:8px}
  .mitem{padding:10px;font-size:.9rem}
  .opts.tf{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .brand .bt{display:none}
  #iterPill{display:none}
}

/* ---------- iteration 2 additions ---------- */
button.iter{font:inherit;cursor:not-allowed}
button.iter.open{cursor:pointer;border-style:solid;border-color:color-mix(in srgb,var(--edge) 70%,transparent);color:var(--ink)}
button.iter.open:hover{background:color-mix(in srgb,var(--marker) 30%,transparent)}
.pz-count.over{background:var(--pen);color:#fff}
.cmd.rep{width:auto;padding:0 8px;display:inline-flex;align-items:center;gap:2px}
.cmd small{font-size:.8rem;font-weight:900}
.cipher-key{display:grid;grid-template-columns:repeat(auto-fill,minmax(76px,1fr));gap:6px}
.ck{display:flex;align-items:center;gap:6px;border:2px solid color-mix(in srgb,var(--edge) 35%,transparent);border-radius:8px;padding:4px 8px;font-weight:900}
.sym{font-size:1.4rem;color:var(--blue);font-variant-emoji:text;font-family:'Segoe UI Symbol','Apple Symbols',system-ui,sans-serif}
.cword{display:flex;flex-wrap:wrap;gap:10px}
.cslot{width:62px;border:2px solid var(--edge);border-radius:12px;display:grid;justify-items:center;padding:6px 0;background:var(--card)}
.cslot .sym{font-size:2rem}
.cslot .lt{min-height:1.6em;font-family:var(--f-display);font-size:1.3rem;border-top:2px dashed color-mix(in srgb,var(--edge) 35%,transparent);width:80%;text-align:center}
.cslot.cur{background:color-mix(in srgb,var(--marker) 40%,var(--card))}
.cslot.done{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 14%,var(--card))}
.letter-bank{display:flex;flex-wrap:wrap;gap:6px}
.letter-bank .key{flex:0 0 46px}
.phrase{font-family:var(--f-display);font-size:clamp(1.3rem,4vw,2rem);letter-spacing:.06em;overflow-wrap:anywhere}
.phrase span{border-bottom:3px solid transparent;padding-inline:1px}
.phrase span.sp{display:inline-block;min-width:.6em}
.phrase span.done{color:var(--ok)}
.phrase span.cur{background:var(--marker);color:#1C2554;border-bottom-color:var(--edge)}
.code-rows{display:grid;gap:2px;font-family:ui-monospace,'SF Mono',Menlo,Consolas,monospace;font-size:clamp(1rem,3.4vw,1.35rem);font-weight:800;letter-spacing:.35em}
.code-rows span{color:var(--ink-2)}
.code-rows span.one{color:var(--blue)}
.fix-line{font-size:clamp(1.2rem,3.6vw,1.6rem);line-height:2.1;font-weight:700}
.tok{border:0;background:none;padding:2px 3px;border-radius:6px;cursor:pointer;font:inherit;color:inherit}
.tok:hover{background:color-mix(in srgb,var(--marker) 35%,transparent)}
.tok.fixed{background:color-mix(in srgb,var(--ok) 25%,transparent);color:var(--ok);text-decoration:underline;text-decoration-thickness:3px;cursor:default}
.tok.nope{background:color-mix(in srgb,var(--pen) 25%,transparent)}

/* ---------- iteration 3 additions ---------- */
.cmd.grp{width:auto;height:auto;min-height:42px;padding:2px 8px;display:inline-flex;align-items:center;gap:4px;border-style:solid;background:color-mix(in srgb,var(--blue) 12%,var(--card))}
.cmd.grp.open{border-style:dashed;background:color-mix(in srgb,var(--marker) 35%,var(--card))}
.cmd.grp span{font-size:1.2rem}
.table-wrap{overflow-x:auto;border:2px solid var(--edge);border-radius:10px}
.dtable{border-collapse:collapse;width:100%;min-width:420px;font-variant-numeric:tabular-nums}
.dtable th,.dtable td{border:1px solid color-mix(in srgb,var(--edge) 30%,transparent);padding:0;text-align:left}
.dtable thead th{background:color-mix(in srgb,var(--tc) 18%,var(--card));padding:8px 10px;font-weight:900}
.cellbtn{display:block;width:100%;border:0;background:none;padding:9px 10px;text-align:left;cursor:pointer;font-weight:700}
.cellbtn:hover{background:color-mix(in srgb,var(--marker) 30%,transparent)}
.dtable .right{background:color-mix(in srgb,var(--ok) 28%,var(--card))}
.dtable .wrong{background:color-mix(in srgb,var(--pen) 25%,var(--card))}
.coords{display:grid;grid-template-columns:minmax(0,420px) minmax(0,1fr);gap:22px;align-items:start}
.cgrid-wrap{max-width:100%}
.cgrid{display:grid;grid-template-columns:28px repeat(var(--n),1fr);gap:3px;align-items:center}
.clabel{text-align:center;font-family:var(--f-display);font-size:.85rem;color:var(--ink-2)}
.ccell{aspect-ratio:1;border:2px solid color-mix(in srgb,var(--edge) 35%,transparent);border-radius:6px;background:var(--card);cursor:pointer;font-size:clamp(1rem,4vw,1.6rem);padding:0;display:grid;place-items:center}
.ccell:hover{background:color-mix(in srgb,var(--marker) 30%,var(--card))}
.ccell.hl{border-color:var(--blue);box-shadow:0 0 0 3px color-mix(in srgb,var(--blue) 35%,transparent)}
.ccell.set{border-color:var(--ok)}
@media (max-width:820px){ .coords{grid-template-columns:minmax(0,1fr)} }

/* ---------- richer lesson slides (iteration 2+) ---------- */
.fact{margin-top:14px;padding:10px 14px;border:2px dashed var(--blue);border-radius:10px;background:color-mix(in srgb,var(--blue) 8%,var(--card));max-width:62ch}
.fact strong{color:var(--blue)}
.slide.dense{grid-template-columns:minmax(0,.62fr) minmax(0,1.8fr);align-items:start;font-size:.96rem}
.slide.dense .pic{font-size:clamp(2.4rem,6vw,3.8rem);padding:18px 10px;position:sticky;top:90px}
@media (max-width:820px){ .slide.dense{grid-template-columns:minmax(0,1fr)} .slide.dense .pic{position:static} }

/* ---------- "learn more" links on slides ---------- */
.links{margin-top:14px;padding:10px 14px;border:2px solid color-mix(in srgb,var(--edge) 30%,transparent);border-radius:10px;max-width:62ch}
.links ul{margin:6px 0 4px;padding:0;list-style:none;display:grid;gap:4px}
/* the slide's two-column list layout must not apply here: one link per line */
.slide .links ul{grid-template-columns:minmax(0,1fr)}
.slide .links li{display:block}
.links a{color:var(--blue);font-weight:800;text-underline-offset:3px;overflow-wrap:anywhere}
.links small{font-size:.8rem}

/* ---------- iteration 4 additions ---------- */
.bcards{display:flex;flex-wrap:wrap;gap:10px;margin-block:8px 4px}
.bcard{flex:1 1 90px;max-width:130px;min-height:150px;border:2px solid var(--edge);border-radius:12px;background:var(--card);cursor:pointer;display:grid;grid-template-rows:auto 1fr auto;align-items:center;justify-items:center;padding:10px 6px;box-shadow:3px 3px 0 var(--drop);color:var(--ink-2)}
.bcard .bv{font-family:var(--f-display);font-size:1.5rem;color:var(--ink)}
.bcard .bdots{font-size:.6rem;line-height:1.1;letter-spacing:1px;word-break:break-all;max-width:80px;text-align:center}
.bcard .bb{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:1.4rem;font-weight:900}
.bcard.on{background:var(--marker);color:#1C2554;border-color:var(--edge)}
.bcard.on .bv{color:#1C2554}
.bcard:not(.on) .bdots{opacity:.25}
.bin-sum{display:block;font-size:1.1rem;font-variant-numeric:tabular-nums}
.bin-bits{font-size:1.2rem;font-weight:900;letter-spacing:.2em;color:var(--blue)}

/* ---------- iteration 5 additions ---------- */
.fx-bar{display:flex;align-items:center;gap:10px;border:2px solid var(--edge);border-radius:10px;padding:8px 12px;margin-bottom:12px;background:var(--paper);overflow-x:auto}
.fx-label{font-style:italic;font-weight:900;color:var(--ink-2)}
.fx{font-size:1.15rem;font-weight:900;color:var(--blue);white-space:nowrap}
.sheet td,.sheet th{padding:8px 10px;text-align:center;font-variant-numeric:tabular-nums}
.sheet tbody th{background:color-mix(in srgb,var(--tc) 12%,var(--card));width:40px}
.sheet td.ref{background:color-mix(in srgb,var(--marker) 55%,var(--card));color:#1C2554;font-weight:900;outline:2px solid var(--edge);outline-offset:-2px}
.sheet-input{width:9em;font:inherit;font-size:1.1rem;font-weight:800;padding:8px 10px;border:2px solid var(--edge);border-radius:10px;background:var(--card);color:var(--ink)}
.flow-wrap{margin-bottom:20px}
.flow{list-style:none;margin:0;padding:0;display:grid;gap:22px;max-width:520px}
.flow-node{position:relative;display:grid;grid-template-columns:30px minmax(0,1fr);gap:10px;align-items:center}
.flow-node:not(:last-child)::after{content:"↓";position:absolute;left:calc(30px + 10px + 50%);bottom:-22px;transform:translateX(-50%);color:var(--ink-2);font-weight:900}
.flow-num{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;border:2px solid var(--edge);font-family:var(--f-display);font-size:.8rem;background:var(--card)}
.flow-box{border:2px solid var(--edge);padding:9px 14px;font-weight:800;text-align:center;background:var(--card)}
.k-start .flow-box,.k-end .flow-box{border-radius:999px;background:color-mix(in srgb,var(--ok) 15%,var(--card))}
.k-in .flow-box,.k-out .flow-box{transform:skewX(-12deg);background:color-mix(in srgb,var(--blue) 10%,var(--card))}
.k-proc .flow-box{border-radius:4px}
.k-if .flow-box{border-radius:18px;border-width:3px;border-style:double;background:color-mix(in srgb,var(--marker) 30%,var(--card));color:var(--ink)}
.flow-jumps{grid-column:2;display:flex;gap:14px;font-weight:800;font-size:.9rem;margin-top:-4px;flex-wrap:wrap}
.flow-jumps .yes{color:var(--ok)}
.flow-jumps .no{color:var(--pen)}

/* ---------- review additions: my block, turtle, states, chart, Caesar, swap sort ---------- */
.program.def{border-style:solid;border-color:color-mix(in srgb,var(--edge) 35%,transparent);background:color-mix(in srgb,var(--marker) 10%,var(--card))}
.program.def.open{border-color:var(--edge);background:color-mix(in srgb,var(--marker) 35%,var(--card))}
.cmd.call{background:color-mix(in srgb,var(--marker) 45%,var(--card))}
.turtle-wrap{border:2px solid var(--edge);border-radius:10px;background:var(--card);aspect-ratio:1;max-width:100%}
.turtle-svg{display:block;width:100%;height:100%}
.t-dot{fill:var(--ink-2);opacity:.45}
.t-target{stroke:var(--ink-2);stroke-width:.12;stroke-dasharray:.18 .12;stroke-linecap:round;opacity:.55}
.t-trail{stroke:var(--blue);stroke-width:.14;stroke-linecap:round}
.arrow.t-btn{padding:10px 14px;font-size:1rem;width:auto}
.st-states{display:flex;flex-wrap:wrap;gap:10px;margin-block:8px 12px}
.st-state{display:flex;flex-direction:column;align-items:center;gap:2px;min-width:92px;padding:10px 12px;border:2px solid var(--edge);border-radius:999px;background:var(--card);font-weight:800;text-align:center;transition:background .2s,transform .2s}
.st-state .st-e{font-size:1.6rem}
.st-state.on{background:var(--marker);color:#1C2554;transform:scale(1.06)}
.st-arrows{list-style:none;margin:0;padding:0;display:grid;gap:4px;font-weight:700;font-size:.95rem}
.st-in{color:var(--blue);font-weight:900}
.c-chart{display:grid;grid-template-columns:44px minmax(0,1fr);gap:8px;height:300px;margin-top:10px}
.c-axis{position:relative;border-right:2px solid var(--edge);font-size:.8rem;color:var(--ink-2);font-variant-numeric:tabular-nums}
.c-axis span{position:absolute;right:6px;transform:translateY(50%)}
.c-bars{display:flex;align-items:flex-end;gap:10px;border-bottom:2px solid var(--edge);padding-bottom:0;min-width:0}
.c-bar{flex:1;height:100%;display:flex;flex-direction:column;justify-content:flex-end;align-items:stretch;background:none;border:0;padding:0;cursor:pointer;position:relative;min-width:0}
.c-fill{display:block;background:color-mix(in srgb,var(--tc) 70%,var(--card));border:2px solid var(--edge);border-bottom:0;border-radius:6px 6px 0 0}
.c-lab{position:absolute;top:100%;left:0;right:0;margin-top:4px;font-size:.78rem;font-weight:800;text-align:center;overflow-wrap:anywhere}
.c-bar.right .c-fill{background:var(--ok)}
.c-bar.wrong .c-fill{background:var(--pen)}
.c-chart{margin-bottom:46px}
.caesar{display:grid;gap:2px;min-width:560px;padding:6px}
.cz-row{display:flex;gap:2px}
.cz-row span{flex:1;text-align:center;font-weight:900;font-family:ui-monospace,Menlo,Consolas,monospace;padding:3px 0;border-radius:4px;background:var(--paper)}
.cz-row .cz-lab{flex:0 0 7.5em;text-align:left;background:none;font-family:var(--f-body);font-size:.8rem;color:var(--ink-2)}
.cz-ciph span:not(.cz-lab){background:color-mix(in srgb,var(--blue) 15%,var(--card));color:var(--blue)}
.sw-row{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin-block:12px}
.sw-card{min-width:58px;padding:14px 10px;border:2px solid var(--edge);border-radius:10px;background:var(--card);font-family:var(--f-display);font-size:1.2rem;text-align:center;box-shadow:2px 2px 0 var(--drop)}
.sw-swap{border:2px dashed color-mix(in srgb,var(--edge) 45%,transparent);border-radius:999px;background:none;width:34px;height:34px;cursor:pointer;font-weight:900;color:var(--blue)}
.sw-swap:hover{background:color-mix(in srgb,var(--marker) 35%,transparent)}

/* ---------- hands-on projects on other sites ---------- */
.proj-card{max-width:760px}
.proj-head{display:flex;gap:14px;align-items:flex-start}
.proj-icon{font-size:2.6rem;line-height:1}
.proj-name{font-size:1.3rem;margin-top:2px}
.proj-steps{margin:8px 0 0;padding-left:0;list-style:none;display:grid;gap:8px;counter-reset:ps}
.proj-steps li{display:flex;gap:10px;align-items:flex-start;padding:8px 10px;border:2px dashed color-mix(in srgb,var(--edge) 30%,transparent);border-radius:10px}
.proj-steps input{width:20px;height:20px;margin-top:2px;flex:none;accent-color:var(--ok)}
.proj-steps label{font-weight:700;cursor:pointer}
.proj-steps li:has(input:checked){border-style:solid;border-color:var(--ok);background:color-mix(in srgb,var(--ok) 10%,var(--card))}
a.btn{color:inherit}
a.btn.primary{color:var(--on-blue)}

/* ---------- Tower of Hanoi ---------- */
.hn-board{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(6px,2vw,16px);margin-top:8px;user-select:none;-webkit-user-select:none}
.hn-peg{position:relative;height:calc(var(--hn-n) * var(--dh) + 64px);border:2px dashed transparent;border-radius:12px;cursor:pointer;touch-action:none}
.hn-peg:hover{background:color-mix(in srgb,var(--blue) 6%,transparent)}
.hn-peg.sel,.hn-peg.over{border-color:var(--blue);background:color-mix(in srgb,var(--blue) 10%,transparent)}
.hn-peg.hint-to{border-color:var(--ok);border-style:solid}
.hn-peg::after{content:"";position:absolute;left:4%;right:4%;bottom:26px;height:8px;border-radius:4px;background:var(--edge)}
.hn-rod{position:absolute;left:50%;bottom:30px;width:10px;height:calc(var(--hn-n) * var(--dh) + 22px);transform:translateX(-50%);border-radius:5px 5px 0 0;background:var(--ink-2)}
.hn-name{position:absolute;left:0;right:0;bottom:0;text-align:center;font-family:var(--f-display);font-size:.95rem}
.hn-disc{position:absolute;left:50%;margin-bottom:34px;height:calc(var(--dh) - 3px);transform:translateX(-50%);border:2px solid var(--edge);border-radius:999px;color:#fff;font-weight:900;font-size:.8rem;display:grid;place-items:center;text-shadow:0 1px 1px rgba(0,0,0,.45);transition:transform .15s;z-index:1}
.hn-disc.up{transform:translate(-50%,-26px);box-shadow:0 8px 0 rgba(0,0,0,.18)}
.hn-disc.last{outline:3px solid var(--marker);outline-offset:1px}
.hn-disc.hint{animation:hn-pulse .9s ease-in-out infinite}
.hn-disc.ghost{position:fixed;margin:0;transform:none;pointer-events:none;z-index:50;height:26px}
.hn-disc.dragging{opacity:.35}
@keyframes hn-pulse{50%{transform:translate(-50%,-12px)}}
.hn-counter{margin-top:18px;padding-top:14px;border-top:2px dashed var(--grid)}
.hn-bitrow{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:6px}
.hn-bits{display:flex;gap:6px}
.hn-bit{width:36px;height:42px;display:grid;place-items:center;border:2px solid var(--edge);border-radius:10px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:1.3rem;font-weight:900;background:var(--card);border-bottom:6px solid var(--bc,var(--edge))}
.hn-bit.low{background:var(--bc);color:#fff;text-shadow:0 1px 1px rgba(0,0,0,.45)}
.hn-dec{font-family:var(--f-display);font-size:1.1rem}
.hn-sizes{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.hn-rules{margin:0;padding-left:20px;display:grid;gap:6px}
.game-card{display:flex;gap:16px;align-items:center;text-align:left;width:100%;background:var(--card);border:2px solid var(--edge);border-radius:var(--r);padding:16px;cursor:pointer;box-shadow:4px 4px 0 var(--drop);transition:transform .12s, box-shadow .12s}
.game-card:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--drop)}
.game-card .sticker{flex:none}
.game-card h3{font-size:1.05rem;margin-bottom:4px}
.site-card{color:inherit;text-decoration:none}
.site-card .ext-ic{opacity:.6;font-weight:400}
.site-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.site-tags span{font-size:.78rem;font-weight:800;border:2px solid var(--edge);border-radius:999px;padding:1px 8px;background:var(--paper)}
.site-tags .acc-no{border-color:var(--ok)}
.site-tags .acc-yes{border-color:#D6336C}
.site-note{font-size:.85rem;margin-top:6px}
.games{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px;margin-bottom:24px}
@media (prefers-reduced-motion: reduce){ .hn-disc.hint{animation:none;outline:3px dashed var(--ok)} }
@media (max-width:520px){ .hn-bit{width:30px;height:38px;font-size:1.1rem} .hn-disc{font-size:.7rem} }

/* ---------- Melody ---------- */
.mel-palette{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:6px;margin-top:8px}
.mel-key{display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:2px;min-height:76px;padding:6px 2px;border:2px solid var(--edge);border-radius:10px;background:var(--nc);color:#fff;cursor:pointer;box-shadow:3px 3px 0 var(--drop);text-shadow:0 1px 1px rgba(0,0,0,.45);transition:transform .08s}
.mel-key:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--drop)}
.mel-key b{font-size:.9rem;line-height:1.1}
.mel-key small{font-size:.7rem;opacity:.85}
.mel-key.rest{background:var(--card);color:var(--ink-2);text-shadow:none}
.mel-prog{display:flex;flex-wrap:wrap;gap:6px;align-items:center;min-height:52px}
.mel-note{border:2px solid var(--edge);border-radius:999px;background:var(--nc);color:#fff;font-weight:800;font-size:.8rem;padding:4px 9px;cursor:pointer;text-shadow:0 1px 1px rgba(0,0,0,.45)}
.mel-note.now,.mel-grp.now{outline:3px solid var(--marker);outline-offset:2px}
.mel-grp{display:flex;flex-wrap:wrap;gap:4px;align-items:center;border:2px dashed var(--edge);border-radius:12px;padding:4px 6px;background:color-mix(in srgb,var(--marker) 18%,var(--card))}
.mel-grp.open{border-color:var(--blue);border-style:solid}
.mel-grp-h{border:0;background:none;font-weight:900;cursor:pointer;padding:0 4px}
.mel-row{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:6px}
.mel-strip{display:flex;gap:2px;overflow-x:auto;padding:6px;border:2px solid var(--grid);border-radius:10px;min-height:118px;background:repeating-linear-gradient(0deg,transparent 0 11px,var(--grid) 11px 12px);margin-bottom:8px}
.mel-strip.sample{background-color:color-mix(in srgb,var(--blue) 5%,var(--card))}
.mel-col{position:relative;flex:0 0 18px;height:104px;border-radius:6px}
.mel-col.now{background:color-mix(in srgb,var(--marker) 45%,transparent)}
.mel-col.wrong{background:color-mix(in srgb,var(--pen) 30%,transparent)}
.mel-dot{position:absolute;left:2px;width:14px;height:14px;border-radius:50%;border:2px solid var(--edge)}
.mel-rest{position:absolute;left:5px;bottom:46px;width:8px;height:3px;border-radius:2px;background:var(--ink-2)}
@media (max-width:520px){ .mel-palette{grid-template-columns:repeat(5,minmax(0,1fr))} .mel-key{min-height:60px} }

/* ---------- River crossing ---------- */
.rv-scene{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr) minmax(0,1fr);gap:0;margin-top:12px;border:2px solid var(--edge);border-radius:var(--r);overflow:hidden;min-height:170px}
.rv-bank{background:color-mix(in srgb,var(--ok) 22%,var(--card));padding:10px;display:flex;flex-wrap:wrap;align-content:flex-start;gap:6px}
.rv-label{flex-basis:100%;font-weight:800;font-size:.85rem;color:var(--ink-2)}
.rv-water{background:repeating-linear-gradient(170deg,color-mix(in srgb,var(--blue) 30%,var(--card)) 0 14px,color-mix(in srgb,var(--blue) 22%,var(--card)) 14px 28px);display:flex;align-items:center;justify-content:flex-start;padding:10px}
.rv-water.right{justify-content:flex-end}
.rv-boat{position:relative;display:flex;gap:4px;align-items:center;padding:8px 10px 18px;border:2px solid var(--edge);border-radius:12px 12px 40px 40px;background:#B07A45;min-width:96px;min-height:64px;transition:transform .6s}
.rv-item{font-size:2rem;line-height:1;border:2px solid var(--edge);border-radius:12px;background:var(--card);padding:6px;cursor:pointer;box-shadow:2px 2px 0 var(--drop)}
.rv-item.small{font-size:1.6rem;padding:4px}
.rv-item:disabled{cursor:default;box-shadow:none;opacity:.9}
.rv-scene.fail{animation:shake .45s}
.rv-hist{margin:6px 0 0;padding-left:28px;display:grid;gap:2px;font-variant-numeric:tabular-nums;max-height:220px;overflow:auto}
.rv-hist li.bad{color:var(--pen);font-weight:800}
@media (max-width:520px){ .rv-item{font-size:1.5rem;padding:4px} .rv-item.small{font-size:1.3rem} .rv-boat{min-width:70px} }

/* ---------- Nonogram ---------- */
.nn-wrap{overflow-x:auto;padding:4px 0}
.nn-grid{display:grid;grid-template-columns:auto repeat(var(--cols),var(--cs));gap:0;width:max-content;margin-inline:auto;user-select:none;-webkit-user-select:none;touch-action:none}
.nn-corner{min-width:12px}
.nn-clue{display:flex;font-weight:800;font-variant-numeric:tabular-nums;color:var(--ink);font-size:.85rem}
.nn-clue.col{flex-direction:column;justify-content:flex-end;align-items:center;padding-bottom:4px;line-height:1.15}
.nn-clue.row{justify-content:flex-end;align-items:center;gap:6px;padding-right:8px}
.nn-clue.done{color:var(--ink-2);opacity:.55}
.nn-cell{width:var(--cs);height:var(--cs);border:1px solid color-mix(in srgb,var(--edge) 35%,transparent);background:var(--card);padding:0;cursor:pointer;font-size:.8rem;color:var(--ink-2);display:grid;place-items:center}
.nn-cell.br{border-right:2px solid var(--edge)}
.nn-cell.bb{border-bottom:2px solid var(--edge)}
.nn-cell.on{background:var(--ink)}
.nn-cell.wrong{background:var(--pen)}
.nn-grid.solved .nn-cell.on{background:var(--ok);transition:background .4s}
.nn-picker{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:16px}
.nn-pick{display:flex;flex-direction:column;align-items:center;gap:4px;width:74px;padding:8px 6px;border:2px solid var(--edge);border-radius:12px;background:var(--card);cursor:pointer;box-shadow:3px 3px 0 var(--drop)}
.nn-pick.on{background:var(--marker);color:#1C2554}
.nn-pick small{font-weight:800}
.nn-q{font-family:var(--f-display);font-size:1.6rem;line-height:44px}
.nn-mini{display:grid;width:44px;height:44px;gap:0}
.nn-mini i{background:transparent}
.nn-mini i.on{background:var(--ok)}

/* ---------- Logic circuits ---------- */
.lg-box{border:2px solid var(--grid);border-radius:12px;padding:6px;background:var(--card);margin-top:8px}
.lg-svg{display:block;max-width:100%;height:auto;margin-inline:auto}
.lg-wire{fill:none;stroke:var(--ink-2);stroke-width:4;stroke-linejoin:round;opacity:.55}
.lg-wire.on{stroke:#F5B400;opacity:1;stroke-width:6}
.lg-wire.off{stroke:var(--ink-2);opacity:.35}
.lg-switch rect{fill:var(--card);stroke:var(--edge);stroke-width:2.5}
.lg-switch circle{fill:var(--ink-2)}
.lg-switch text{font-family:var(--f-display);font-size:16px;fill:var(--ink)}
.lg-switch.on rect{fill:#FFD43B}
.lg-switch.on circle{fill:#1C2554}
.lg-switch.on text{fill:#1C2554}
.lg-switch:not(.locked){cursor:pointer}
.lg-switch:focus-visible rect{stroke:var(--blue);stroke-width:4}
.lg-gate rect{fill:color-mix(in srgb,var(--blue) 14%,var(--card));stroke:var(--edge);stroke-width:2.5}
.lg-gate.hidden-gate rect{fill:color-mix(in srgb,var(--marker) 30%,var(--card));stroke-dasharray:6 4}
.lg-gate.on rect{stroke:#F5B400;stroke-width:4}
.lg-gate text{font-family:var(--f-display);font-size:15px;fill:var(--ink)}
.lg-lamp circle{fill:var(--card);stroke:var(--edge);stroke-width:2.5}
.lg-lamp text{font-size:20px;opacity:.35}
.lg-lamp.on circle{fill:#FFE066;filter:drop-shadow(0 0 10px #FFD43B)}
.lg-lamp.on text{opacity:1}
.lg-table{border-collapse:collapse;margin:12px 0;font-weight:800;font-variant-numeric:tabular-nums}
.lg-table th,.lg-table td{border:2px solid var(--edge);padding:4px 12px;text-align:center}
.lg-table th{background:color-mix(in srgb,var(--blue) 12%,var(--card))}
.lg-table tr.wrong td{background:color-mix(in srgb,var(--pen) 25%,var(--card))}
.lg-guess{border:0;background:none;font-size:1.2rem;cursor:pointer;min-width:36px;font-weight:900}

/* ---------- Reading ---------- */
.rd-idea{font-size:1.08rem;font-weight:700;margin-bottom:8px}
.rd-sec{margin-top:26px}
.rd-sec > h2{font-size:1.25rem;margin-bottom:4px}
.rd-timeline{display:grid;gap:14px;margin-top:12px;border-left:4px solid var(--tc);padding-left:16px}
.rd-event{display:grid;grid-template-columns:110px minmax(0,1fr);gap:14px;background:var(--card);border:2px solid var(--edge);border-radius:var(--r);box-shadow:4px 4px 0 var(--drop);padding:14px;position:relative}
.rd-event::before{content:"";position:absolute;left:-27px;top:20px;width:14px;height:14px;border-radius:50%;background:var(--tc);border:3px solid var(--card)}
.rd-date{font-family:var(--f-display);font-size:.95rem;line-height:1.25}
.rd-body h3{font-size:1.05rem;margin:2px 0 6px}
.rd-kind{font-size:.82rem;font-weight:800;color:var(--ink-2);text-transform:uppercase;letter-spacing:.03em}
.rd-src{font-size:.85rem;margin-top:8px}
.rd-src a,.rd-coord a,.rd-ed a{color:var(--blue);font-weight:700}
.rd-museums{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-top:12px}
.rd-museum{background:var(--card);border:2px solid var(--edge);border-radius:var(--r);box-shadow:4px 4px 0 var(--drop);padding:14px;display:grid;gap:4px;align-content:start}
.rd-museum h3{font-size:1rem}
.rd-coord{font-variant-numeric:tabular-nums;font-weight:700}
.rd-status{font-size:.8rem}
.rd-status.ok{background:color-mix(in srgb,var(--ok) 18%,var(--card))}
.rd-ed{margin:6px 0 0;padding-left:20px;display:grid;gap:4px}
@media (max-width:520px){ .rd-event{grid-template-columns:minmax(0,1fr);gap:4px} }
/* fixed keys (Morse, Braille): signs can be several characters long */
.cipher-key.fixed .sym{font-family:ui-monospace,Menlo,Consolas,monospace;letter-spacing:2px;white-space:nowrap}
.cword.fixed .cslot{width:auto;min-width:62px;padding:6px 10px}
.cword.fixed .sym{font-size:1.5rem;font-family:ui-monospace,Menlo,Consolas,monospace;letter-spacing:2px;white-space:nowrap}

/* ---------- Glossary ---------- */
.gl-tools{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:10px}
.gl-search{flex:1 1 260px;font:inherit;padding:10px 14px;border:2px solid var(--edge);border-radius:12px;background:var(--card);color:var(--ink);box-shadow:3px 3px 0 var(--drop)}
.gl-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:10px;margin-top:14px}
.gl-letter{grid-column:1/-1;font-family:var(--f-display);font-size:1.2rem;margin-top:8px;border-bottom:2px dashed var(--grid)}
.gl-card{display:flex;gap:12px;align-items:flex-start;text-align:left;background:var(--card);border:2px solid var(--edge);border-radius:var(--r);padding:12px;cursor:pointer;box-shadow:3px 3px 0 var(--drop);color:var(--ink)}
.gl-card:hover{transform:translate(-1px,-1px);box-shadow:4px 4px 0 var(--drop)}
.gl-card.big{cursor:default;display:block;padding:18px;box-shadow:4px 4px 0 var(--drop)}
.gl-card.big:hover{transform:none}
.gl-e{font-size:1.6rem;line-height:1;flex:none}
.gl-s{display:block;font-size:.9rem;color:var(--ink-2);margin-top:2px}
.gl-head{display:flex;gap:14px;align-items:center;margin-bottom:10px}
.gl-head .gl-e{font-size:2.6rem}
.gl-short{font-weight:800;font-size:1.08rem;margin-bottom:6px}
.gl-card.big p{margin-top:8px}
.gl-ex{background:color-mix(in srgb,var(--marker) 22%,var(--card));border-radius:10px;padding:8px 12px}
.gl-rel{display:flex;gap:6px;flex-wrap:wrap;align-items:center;margin-top:10px}
.gl-rel .pill{cursor:pointer}
.gl-group{margin-top:12px}
.gl-group h3{font-size:1rem;margin-bottom:6px}
.gl-refs{display:flex;flex-wrap:wrap;gap:8px}
.gl-ref{border:2px solid var(--edge);border-radius:999px;background:var(--card);padding:4px 12px;font-weight:700;cursor:pointer;color:var(--ink)}
.gl-ref:hover{background:color-mix(in srgb,var(--marker) 30%,var(--card))}
.gl-term{all:unset;cursor:help;border-bottom:2px dotted var(--blue);color:inherit}
.gl-term:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
.gl-pop{position:absolute;z-index:60;max-width:min(320px,calc(100vw - 16px));background:var(--card);border:2px solid var(--edge);border-radius:12px;box-shadow:4px 4px 0 var(--drop);padding:12px 14px;display:grid;gap:6px;color:var(--ink)}
.gl-pop p{font-size:.95rem}
.gl-pop .btn{justify-self:start}
.gl-x{position:absolute;top:4px;right:6px;border:0;background:none;cursor:pointer;font-size:.9rem;color:var(--ink-2)}
.gl-sel{position:absolute;z-index:61;border:2px solid var(--edge);border-radius:999px;background:var(--marker);color:#1C2554;font-weight:800;padding:4px 12px;cursor:pointer;box-shadow:2px 2px 0 var(--drop)}

/* ===== Program code: language tabs, colours, run, tests (js/app.js "PROGRAM CODE") ===== */
.code{margin:14px 0;border:2.5px solid var(--edge);border-radius:var(--r);background:var(--card);overflow:hidden;min-width:0}
.code-bar{display:flex;align-items:center;gap:8px;padding:6px 8px;border-bottom:2px solid var(--grid);flex-wrap:wrap}
.code-bar .sp{flex:1}
.code-tabs{display:flex;gap:4px}
.code-tabs button{font:800 .9rem var(--f-body);color:var(--ink-2);background:none;border:2px solid transparent;border-radius:9px;padding:3px 10px;cursor:pointer}
.code-tabs button.on{color:var(--ink);border-color:var(--edge);background:var(--marker);color:#1C2554}
.code-src,.code-edit,.code-out pre,.code-in,.code-test pre,.parsons-line code,.parsons-done{font:500 .9rem/1.5 ui-monospace,'SF Mono',Menlo,Consolas,monospace;tab-size:4}
.code-src{margin:0;padding:10px 14px;overflow-x:auto;white-space:pre;background:color-mix(in srgb,var(--grid) 35%,var(--card))}
.code-edit{display:block;width:100%;box-sizing:border-box;border:0;padding:10px 14px;resize:vertical;white-space:pre;overflow:auto;color:var(--ink);background:color-mix(in srgb,var(--marker) 8%,var(--card))}
.code-edit:focus{outline:3px solid var(--blue);outline-offset:-3px}
.c-kw{color:var(--blue);font-weight:700} .c-st{color:var(--ok)} .c-nu{color:var(--m3)} .c-cm{color:var(--ink-2);font-style:italic} .c-at{color:var(--m4)}
.code-lbl{display:block;padding:6px 14px 0;font-weight:800;font-size:.85rem;color:var(--ink-2)}
.code-in{display:block;width:100%;box-sizing:border-box;margin-top:4px;padding:6px 10px;border:2px solid var(--grid);border-radius:8px;background:var(--card);color:var(--ink);resize:vertical}
.code .row{padding:8px 14px}
.code-out{margin:0 14px 10px;padding:8px 12px;border-radius:10px;border:2px solid var(--ok);background:color-mix(in srgb,var(--ok) 8%,var(--card))}
.code-out.bad{border-color:var(--pen);background:color-mix(in srgb,var(--pen) 8%,var(--card))}
.code-out pre{margin:0;white-space:pre-wrap;word-break:break-word}
.code-out pre.err,.code-msg{color:var(--pen)}
.code-out:not(.bad) .code-msg{color:var(--ink-2)}
.code-msg{font-weight:800;margin:4px 0}
.code-msg.good{color:var(--ok)}
.code-note{font-family:var(--f-body);display:block;padding:0 14px 10px;font-size:.8rem}
.stage>.code-note{padding:6px 0}
.code-preview{display:block;width:calc(100% - 28px);margin:4px 14px 14px;height:220px;border:2px dashed var(--edge);border-radius:10px;background:#fff}
.code-tests{display:grid;gap:8px;margin-top:12px}
.code-test{border:2px solid var(--grid);border-radius:10px;padding:6px 12px;background:var(--card)}
.code-test.pass{border-color:var(--ok)} .code-test.fail{border-color:var(--pen)}
.code-test summary{font-weight:800;cursor:pointer}
.code-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px;margin-top:6px}
.code-cols small{font-weight:800;color:var(--ink-2)}
.code-test pre{margin:2px 0 0;padding:6px 8px;border-radius:8px;background:color-mix(in srgb,var(--grid) 35%,var(--card));white-space:pre-wrap;word-break:break-word}
.parsons-pool{display:flex;flex-direction:column;gap:6px;align-items:flex-start;margin:8px 0 14px}
.parsons-line{border:2px solid var(--edge);border-radius:9px;background:var(--card);color:var(--ink);padding:5px 12px;cursor:pointer;text-align:left;box-shadow:0 3px 0 var(--drop);max-width:100%;overflow-x:auto}
.parsons-line code{white-space:pre}
.parsons-done{list-style:none;margin:0;padding:10px 14px;min-height:3em;border:2.5px dashed var(--edge);border-radius:var(--r);counter-reset:ln}
.parsons-done li{white-space:pre;counter-increment:ln}
.parsons-done li::before{content:counter(ln);display:inline-block;width:2em;color:var(--ink-2);font-size:.8em}
.q + .code, .slide .code{max-width:100%}

/* per-language note under a code listing */
.code-tip{font-family:var(--f-body);margin:0;padding:8px 14px;border-top:2px dashed var(--grid);font-size:.92rem;line-height:1.45;background:color-mix(in srgb,var(--blue) 6%,var(--card))}
.code-tip-l{display:inline-block;font:800 .75rem var(--f-body);padding:1px 7px;border-radius:6px;background:var(--marker);color:#1C2554;margin-right:4px}

/* SQL listings and tasks: the data tables and query results */
.sql-data{margin:0;padding:6px 14px;border-bottom:2px solid var(--grid);font-size:.92rem}
.sql-data summary{font-weight:800;cursor:pointer;padding:4px 0}
.stage>.sql-data{border:2px solid var(--grid);border-radius:var(--r);margin:10px 0;background:var(--card)}
.sql-res{font-size:.88rem;margin:6px 0}
.sql-res caption{text-align:left;font-weight:800;padding:4px 0;font-family:ui-monospace,Menlo,Consolas,monospace}
.code-out .sql-res td,.code-out .sql-res th{padding:3px 8px}

/* acceptance criteria tasks (checked by the teacher) and their printed checklist */
.ac-story{font-size:1.05rem;margin-top:8px}
.ac-list{list-style:none;padding:0;margin:8px 0;display:grid;gap:8px}
.ac-list li{display:flex;gap:10px;align-items:flex-start;border:2px solid var(--grid);border-radius:12px;padding:10px 12px;background:var(--card)}
.ac-list input{width:22px;height:22px;margin-top:2px;flex:none}
.ac-crit{display:flex;gap:10px}
.ac-n{font:800 .8rem var(--f-body);background:var(--marker);color:#1C2554;border-radius:6px;padding:2px 6px;height:fit-content}
.ac-print{display:none}
@media print{
  body.printing > *:not(.ac-print){display:none !important}
  body.printing{background:#fff !important;color:#000}
  body.printing .ac-print{display:block;font:12pt/1.4 Georgia,serif;color:#000}
  .ac-print h1{font-size:18pt;margin:0 0 8pt}
  .ac-print table{width:100%;border-collapse:collapse;margin:10pt 0}
  .ac-print th,.ac-print td{border:1px solid #000;padding:5pt;vertical-align:top;text-align:left}
  .ac-print td:nth-child(3),.ac-print td:nth-child(4){text-align:center;font-size:16pt;width:9%}
  .ac-print td:nth-child(5){width:24%}
  .ac-fields{margin:10pt 0}
}

/* reading the theory before the tasks: a thin bar fills while the slide is read; locked task lists */
.read-bar{height:5px;margin:-6px 6px 10px;border-radius:3px;background:var(--grid);overflow:hidden}
.read-bar i{display:block;height:100%;width:0;background:var(--blue);transition:width .25s linear}
.read-bar.done i{background:var(--ok)}
.read-mark{font-weight:800;font-size:.85rem;color:var(--ink-2)}
.locked-note{font-weight:700;padding:10px 12px;border:2px dashed var(--edge);border-radius:12px;background:color-mix(in srgb,var(--marker) 18%,var(--card))}
.tasks.locked .task-row{opacity:.55;cursor:not-allowed}

/* logic game progress and the 'same input' note */
.lg-count{margin-left:auto;font-weight:800}
.lg-same{font-size:.9rem;margin-top:6px}
.lg-done{text-align:center;padding:20px 0}
.lg-done .row{justify-content:center;margin-top:14px}
.game-prog{font-weight:800;font-size:.85rem;margin-top:4px;color:var(--ink-2)}

/* accounts (js/accounts.js) */
.au-box{max-width:640px;margin-bottom:20px}
.au-form{display:flex;flex-direction:column;gap:12px}
.au-form.row{flex-direction:row;flex-wrap:wrap;align-items:flex-end}
.au-field{display:flex;flex-direction:column;gap:4px;font-weight:700;flex:1 1 220px}
.au-field input{font:inherit;padding:10px 12px;border:2px solid var(--edge);border-radius:12px;background:var(--card);color:var(--ink)}
.au-role{border:0;padding:0;display:flex;gap:16px;flex-wrap:wrap;font-weight:700}
.au-role legend{margin-bottom:4px}
.au-msg{min-height:1.4em;font-weight:700}
.au-msg.bad{color:#C2255C}
.au-msg.good{color:var(--ok)}
.au-list{list-style:none;padding:0;display:grid;gap:6px;font-weight:700}
.au-classes{display:grid;gap:12px}
.au-scroll{overflow-x:auto;max-width:100%}
.au-table td,.au-table th{text-align:center;padding:6px 8px;border:1px solid color-mix(in srgb,var(--edge) 30%,transparent);white-space:nowrap}
.au-table th[scope=row]{text-align:left}
.au-table td.full{background:color-mix(in srgb,var(--ok) 22%,transparent)}
.au-table td.part{background:color-mix(in srgb,var(--marker) 30%,transparent)}
.au-acts{display:flex;gap:6px;justify-content:center}
.au-danger{border-color:#C2255C;margin-top:8px}
.au-del{border-color:#C2255C;color:#C2255C}
.au-name{background:none;border:0;padding:0;font:inherit;font-weight:800;color:var(--blue);text-decoration:underline;cursor:pointer}
.au-st{font-size:1.1rem}
.au-legend{font-size:.88rem;margin-top:8px}
.au-card{margin-top:14px;border-style:dashed}
.au-card-text{font:inherit;font-weight:700;white-space:pre-wrap;margin:8px 0}
.au-dl{display:grid;grid-template-columns:max-content 1fr;gap:6px 14px;margin:10px 0 14px}
.au-dl dt{font-weight:800}
.au-dl dd{margin:0}
.au-profile{margin-top:18px}
.au-classhead{display:flex;align-items:center;justify-content:space-between;gap:12px 20px;flex-wrap:wrap;margin-bottom:6px}
.au-classhead h1{margin:0}
.au-code{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.05rem;border:2px solid var(--edge);border-radius:12px;padding:6px 6px 6px 14px;background:var(--card);box-shadow:3px 3px 0 var(--drop)}
.au-h{margin:18px 0 4px}
.au-add{margin-top:0}
.au-points{margin:10px 0 0;padding-left:0;list-style:none;display:grid;gap:8px;font-weight:700}
.au-recovery{border-color:var(--blue)}
/* in a stacked form the fields take their own height (flex-basis 220px is for fields side by side) */
.au-form:not(.row) .au-field{flex:0 0 auto}
.au-form{gap:10px}
.au-google{gap:10px;background:var(--card)}
.au-g{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;background:#fff;color:#4285F4;font-weight:900;border:1px solid #dadce0}
.au-or{display:flex;align-items:center;gap:10px;margin:14px 0 10px;color:var(--ink-2);font-weight:700}
.au-or::before,.au-or::after{content:'';flex:1;border-top:2px solid color-mix(in srgb,var(--edge) 25%,transparent)}
.au-role-btn{font-size:1.1rem;padding:16px 26px}
.au-select{font:inherit;padding:10px 12px;border:2px solid var(--edge);border-radius:12px;background:var(--card);color:var(--ink)}

/* Neurons and activation (js/accounts.js, rules/neurons.md) */
.au-coin{display:inline-block;width:22px;height:22px;vertical-align:middle;flex:none}
.au-coin svg,.au-iter-ic svg{width:100%;height:100%;display:block}
.au-coin.big{width:32px;height:32px}
.nrn-pill{display:inline-flex;align-items:center;gap:6px;padding:3px 10px 3px 4px;cursor:pointer;font:inherit}
.au-home-h{font-size:clamp(1.4rem,4vw,2rem);margin:0}
.iter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;margin-bottom:24px}
.iter-tile{display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;background:var(--card);border:2px solid var(--edge);border-radius:var(--r);padding:16px 12px;box-shadow:4px 4px 0 var(--drop);cursor:pointer;font:inherit;color:var(--ink);transition:transform .12s,box-shadow .12s}
.iter-tile:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--drop)}
.iter-tile .au-iter-ic{width:84px;height:84px;display:block}
.iter-tile h3{margin:0;font-size:1.05rem}
.iter-tile p{margin:0}
.iter-tile .bar{width:100%;height:8px;border:2px solid var(--edge);border-radius:99px;overflow:hidden;background:var(--paper)}
.iter-tile .bar i{display:block;height:100%;background:var(--ok)}
.iter-tile-m{font-weight:800;font-size:.9rem}
.iter-tile.off{background:color-mix(in srgb,var(--card) 70%,var(--grid))}
.iter-tile.off .au-iter-ic{filter:grayscale(1);opacity:.45}
.iter-tile.off h3,.iter-tile.off p{color:var(--ink-2)}
.iter-tile.full{border-color:var(--ok)}
.tcard.locked{filter:grayscale(1);opacity:.6}
.au-act .au-act-ic{width:96px;height:96px;margin:0 auto 6px}
.au-act .au-act-ic .au-iter-ic{width:100%;height:100%;display:block;animation:pop .5s}
.au-act .au-act-ic.grey{filter:grayscale(1);opacity:.6}
.au-act-price{display:flex;align-items:center;justify-content:center;gap:8px;font-size:1.2rem;margin:12px 0}
.au-warn{font-weight:700;color:var(--pen)}
.au-balance{font-size:1.4rem;margin:4px 0}
.au-balance b{font-size:2rem}
.au-ledger .plus{color:var(--ok);font-weight:900}
.au-ledger .minus{color:var(--pen);font-weight:900}
.au-cls-it{border-top:1px solid color-mix(in srgb,var(--edge) 20%,transparent);padding:8px 0}
.au-cls-it summary{display:flex;align-items:center;gap:10px;cursor:pointer;list-style:none}
.au-cls-it summary .au-iter-ic{width:36px;height:36px;display:inline-block}
.au-chip{font:inherit;font-size:.88rem;font-weight:700;border:2px solid var(--edge);border-radius:999px;padding:4px 10px;background:var(--card);color:var(--ink);cursor:pointer}
.au-chip.on{border-color:var(--ok);cursor:default}
@media (max-width:520px){
  .iter-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
  .iter-tile{padding:12px 8px}
  .iter-tile .au-iter-ic{width:60px;height:60px}
  .iter-tile h3{font-size:.95rem}
  .iter-tile-m{font-size:.8rem}
}
.au-iter-card{display:flex;flex-direction:column;align-items:center;text-align:center;gap:6px}
.au-iter-card-ic{width:110px;height:110px}
.au-iter-card-ic .au-iter-ic{width:100%;height:100%;display:block}
.au-iter-card .prog-big{width:100%}
.au-iter-card-btns{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:6px}
.au-cls-it summary{justify-content:space-between}
.au-cls-name{display:flex;flex-direction:column;flex:1;min-width:0}
.au-cls-topics{list-style:none;margin:8px 0 4px;padding:0 0 0 46px;display:grid;gap:6px}
.au-cls-topics li{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:4px 0;border-bottom:1px dashed color-mix(in srgb,var(--edge) 20%,transparent)}
.au-open{color:var(--ok);font-weight:800;white-space:nowrap}
@media (max-width:520px){ .au-cls-topics{padding-left:0} }