/* Code Quest design tokens and components. Static, no external requests. */
@font-face{font-family:"Chakra Petch";font-weight:500;font-display:swap;src:url(fonts/chakra-petch-latin-500-normal.woff2) format("woff2")}
@font-face{font-family:"Chakra Petch";font-weight:600;font-display:swap;src:url(fonts/chakra-petch-latin-600-normal.woff2) format("woff2")}
@font-face{font-family:"Chakra Petch";font-weight:700;font-display:swap;src:url(fonts/chakra-petch-latin-700-normal.woff2) format("woff2")}
@font-face{font-family:"Atkinson Hyperlegible";font-weight:400;font-display:swap;src:url(fonts/atkinson-hyperlegible-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"Atkinson Hyperlegible";font-weight:700;font-display:swap;src:url(fonts/atkinson-hyperlegible-latin-700-normal.woff2) format("woff2")}
@font-face{font-family:"JetBrains Mono";font-weight:400;font-display:swap;src:url(fonts/jetbrains-mono-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"JetBrains Mono";font-weight:700;font-display:swap;src:url(fonts/jetbrains-mono-latin-700-normal.woff2) format("woff2")}

:root{
  /* board: blue solder-mask, not black */
  --board:#101a33; --board-2:#16223f; --panel:#1b2a4d; --panel-2:#22345c; --line:#30456f;
  --silk:#eef2fb; --silk-2:#aebbd6; --silk-3:#7d8db0;
  --t1:#2ed3b7; --t2:#ffb547; --arena:#a98bff;
  --ok:#5bd68a; --bad:#ff7b72; --warn:#ffd166;
  --bronze:#d39263; --silver:#cbd5e6; --gold:#f5c84c; --diamond:#86e6f7;
  --trace-off:#3a4d78; --pad:#0b1226;
  --accent:var(--t1);
  --f-display:"Chakra Petch","Trebuchet MS",sans-serif;
  --f-body:"Atkinson Hyperlegible","Segoe UI",Arial,sans-serif;
  --f-mono:"JetBrains Mono",Consolas,monospace;
  --r:10px; --r-sm:6px;
  --shadow:0 10px 30px rgba(3,8,22,.45);
}
:root[data-theme="light"]{
  --board:#eef1f8; --board-2:#e3e8f3; --panel:#ffffff; --panel-2:#f4f6fb; --line:#cfd7e8;
  --silk:#14203d; --silk-2:#44557d; --silk-3:#6b7a9c;
  --t1:#0d8f7c; --t2:#b36b00; --arena:#6b4fd8;
  --ok:#1c8a4b; --bad:#c7362c; --warn:#946200;
  --bronze:#a8683c; --silver:#7d8aa3; --gold:#b98a00; --diamond:#1493ad;
  --trace-off:#b9c4dc; --pad:#ffffff;
  --shadow:0 8px 24px rgba(20,32,61,.12);
}
*{box-sizing:border-box}
html{font-size:17px}
body{margin:0;background:var(--board);color:var(--silk);font-family:var(--f-body);line-height:1.5;
  background-image:radial-gradient(circle at 1px 1px,rgba(140,165,220,.11) 1px,transparent 1.4px);background-size:22px 22px}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:600;line-height:1.15;margin:0 0 .4em;letter-spacing:.01em}
h1{font-size:clamp(1.7rem,3.2vw,2.5rem);font-weight:700}
h2{font-size:1.45rem} h3{font-size:1.12rem} h4{font-size:1rem}
p{margin:0 0 .8em}
a{color:var(--accent)}
code,pre,.mono{font-family:var(--f-mono)}
:focus-visible{outline:3px solid var(--warn);outline-offset:2px;border-radius:4px}
.t1{--accent:var(--t1)} .t2{--accent:var(--t2)} .ar{--accent:var(--arena)}

/* silkscreen label: the small printed text on a circuit board */
.silk{font-family:var(--f-display);font-weight:600;font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--silk-3)}
.silk b{color:var(--accent);font-weight:700}

/* layout */
.app{display:grid;grid-template-columns:220px 1fr;min-height:100vh}
.rail{background:var(--board-2);border-right:1px solid var(--line);padding:18px 14px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:6px}
.brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;text-decoration:none;color:var(--silk)}
.brand-name{font-family:var(--f-display);font-weight:700;font-size:1.25rem;letter-spacing:.02em}
.brand-name span{color:var(--t1)}
.nav a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--r-sm);color:var(--silk-2);text-decoration:none;font-weight:700;border:1px solid transparent}
.nav a svg{width:20px;height:20px;flex:none}
.nav a:hover{color:var(--silk);background:var(--panel)}
.nav a[aria-current="page"]{color:var(--silk);background:var(--panel);border-color:var(--line);box-shadow:inset 3px 0 0 var(--t1)}
.rail-foot{margin-top:auto;display:grid;gap:8px}
.main{padding:22px clamp(16px,3vw,36px) 90px;max-width:1240px;width:100%}
.topbar{display:flex;align-items:center;gap:12px;justify-content:space-between;margin-bottom:18px;flex-wrap:wrap}
.who{display:flex;align-items:center;gap:10px}
.who .avatar{width:44px;height:44px}
.mock-note{font-size:.8rem;color:var(--silk-3);border:1px dashed var(--line);border-radius:99px;padding:3px 12px}
.tabbar{display:none}
@media (max-width:860px){
  html{font-size:16px}
  .app{grid-template-columns:1fr}
  .rail{display:none}
  .tabbar{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;background:var(--board-2);border-top:1px solid var(--line);z-index:20}
  .tabbar a{display:grid;justify-items:center;gap:2px;padding:8px 2px 10px;color:var(--silk-3);text-decoration:none;font-size:.72rem;font-weight:700}
  .tabbar a svg{width:22px;height:22px}
  .tabbar a[aria-current="page"]{color:var(--t1)}
}

/* panels */
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:var(--shadow);position:relative}
.panel.flat{box-shadow:none}
.panel > .silk:first-child{display:block;margin-bottom:8px}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:1.35fr 1fr} .g3{grid-template-columns:repeat(3,1fr)}
@media (max-width:980px){.g2,.g3{grid-template-columns:1fr}}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.spread{justify-content:space-between}
.muted{color:var(--silk-2)} .small{font-size:.86rem}

/* buttons and chips */
.btn{font:700 .95rem var(--f-body);color:var(--silk);background:var(--panel-2);border:1px solid var(--line);border-radius:var(--r-sm);padding:9px 14px;cursor:pointer;display:inline-flex;gap:8px;align-items:center;text-decoration:none}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#081226}
:root[data-theme="light"] .btn.primary{color:#fff}
.btn.ghost{background:transparent}
.btn svg{width:18px;height:18px}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.chip{display:inline-flex;align-items:center;gap:6px;font:700 .78rem var(--f-mono);padding:3px 9px;border-radius:99px;border:1px solid var(--line);color:var(--silk-2);background:var(--board-2);white-space:nowrap}
.chip.acc{border-color:var(--accent);color:var(--accent)}
.badge-pp{font:700 .72rem var(--f-display);letter-spacing:.1em;text-transform:uppercase;padding:3px 9px;border-radius:4px;background:var(--silk);color:var(--board)}
.badge-es{font:700 .72rem var(--f-display);letter-spacing:.1em;text-transform:uppercase;padding:3px 9px;border-radius:4px;border:1px solid var(--silk-3);color:var(--silk-2)}

/* segmented route switch */
.seg{display:inline-flex;border:1px solid var(--line);border-radius:var(--r-sm);overflow:hidden;background:var(--board-2)}
.seg button{font:700 .86rem var(--f-body);color:var(--silk-2);background:transparent;border:0;padding:8px 13px;cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--accent);color:#081226}
:root[data-theme="light"] .seg button[aria-pressed="true"]{color:#fff}

/* checkpoint strip */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin:16px 0;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--board-2)}
.steps button{all:unset;cursor:pointer;padding:12px 14px;display:grid;gap:2px;border-right:1px solid var(--line);position:relative}
.steps button:last-child{border-right:0}
.steps .n{font:600 .7rem var(--f-display);letter-spacing:.14em;color:var(--silk-3);text-transform:uppercase}
.steps .t{font:600 1.02rem var(--f-display)}
.steps button[aria-selected="true"]{background:var(--panel)}
.steps button[aria-selected="true"]::after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--accent)}
.steps .here{font:700 .66rem var(--f-mono);color:var(--accent)}
.steps .done{color:var(--ok)}
@media (max-width:620px){.steps .t{font-size:.9rem}.steps button{padding:10px 8px}}

/* code and tables */
.code{background:var(--pad);border:1px solid var(--line);border-radius:var(--r-sm);padding:12px 0;font:400 .92rem/1.7 var(--f-mono);overflow-x:auto;margin:0}
.code .ln{display:grid;grid-template-columns:2.6em 1fr;padding:0 14px 0 0;white-space:pre}
.code .ln i{font-style:normal;color:var(--silk-3);text-align:right;padding-right:.9em;user-select:none}
.code .ln.on{background:color-mix(in srgb,var(--accent) 22%,transparent);box-shadow:inset 3px 0 0 var(--accent)}
.kw{color:var(--t2);font-weight:700}
table.tt{border-collapse:collapse;font:400 .95rem var(--f-mono);width:100%}
table.tt th{font:600 .74rem var(--f-display);letter-spacing:.08em;text-transform:uppercase;color:var(--silk-2);padding:7px 6px;border:1px solid var(--line);background:var(--board-2)}
table.tt td{border:1px solid var(--line);padding:0;text-align:center;height:38px;min-width:44px}
table.tt td.given{background:var(--board-2);color:var(--silk-2)}
table.tt td.new{animation:pop .5s ease}
table.tt input{width:100%;height:38px;border:0;background:transparent;color:var(--silk);font:700 .98rem var(--f-mono);text-align:center}
table.tt input:focus{outline:2px solid var(--warn);outline-offset:-2px}
table.tt td.r-ok{background:color-mix(in srgb,var(--ok) 20%,transparent)}
table.tt td.r-bad{background:color-mix(in srgb,var(--bad) 22%,transparent)}
.scroll-x{overflow-x:auto}
@keyframes pop{from{background:color-mix(in srgb,var(--accent) 55%,transparent)}to{background:transparent}}

/* memory boxes */
.mem{display:flex;gap:10px;flex-wrap:wrap}
.box{border:2px solid var(--line);border-radius:var(--r-sm);min-width:78px;text-align:center;background:var(--pad)}
.box .nm{font:600 .7rem var(--f-display);letter-spacing:.1em;text-transform:uppercase;color:var(--silk-2);padding:4px 8px;border-bottom:1px solid var(--line)}
.box .vl{font:700 1.35rem var(--f-mono);padding:6px 8px}
.box.hot{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 25%,transparent)}
.say{border-left:3px solid var(--accent);padding:8px 12px;background:var(--board-2);border-radius:0 var(--r-sm) var(--r-sm) 0}

/* question card */
.qcard{border:1px solid var(--line);border-radius:var(--r);background:var(--panel);overflow:hidden;box-shadow:var(--shadow)}
.qhead{display:flex;gap:10px;align-items:center;justify-content:space-between;flex-wrap:wrap;padding:12px 16px;border-bottom:1px solid var(--line);background:var(--panel-2)}
.qbody{padding:16px;display:grid;gap:14px}
.qfoot{display:flex;gap:10px;flex-wrap:wrap;align-items:center;padding:12px 16px;border-top:1px solid var(--line);background:var(--panel-2)}
.marks{font:700 .9rem var(--f-mono);color:var(--silk-2)}
textarea.ans{width:100%;min-height:110px;background:var(--pad);border:1px solid var(--line);border-radius:var(--r-sm);color:var(--silk);font:400 1rem/1.5 var(--f-body);padding:10px 12px;resize:vertical}
input.short{background:var(--pad);border:1px solid var(--line);border-radius:var(--r-sm);color:var(--silk);font:700 1.05rem var(--f-mono);padding:8px 10px;width:6em;text-align:center}
.fb{border:1px solid var(--line);border-radius:var(--r-sm);overflow:hidden}
.fb-top{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 14px;background:var(--board-2);flex-wrap:wrap}
.score{font:700 1.5rem var(--f-display)}
.score small{font:600 .8rem var(--f-display);color:var(--silk-2);letter-spacing:.08em}
.mp{display:grid;grid-template-columns:26px 1fr auto;gap:10px;align-items:start;padding:9px 14px;border-top:1px solid var(--line)}
.mp .ic{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font:700 .8rem var(--f-mono);color:#081226}
.mp.ok .ic{background:var(--ok)} .mp.no .ic{background:var(--bad)}
.mp.no{background:color-mix(in srgb,var(--bad) 9%,transparent)}
.mp .pt{font:700 .8rem var(--f-mono);color:var(--silk-2)}
.crack{color:var(--bad);font-weight:700}
.repair{color:var(--ok);font-weight:700}

/* hints */
details.hint{border:1px solid var(--line);border-radius:var(--r-sm);background:var(--board-2)}
details.hint + details.hint{margin-top:6px}
details.hint summary{cursor:pointer;padding:8px 12px;font-weight:700;list-style:none;display:flex;gap:8px;align-items:center}
details.hint summary::before{content:"+";font:700 1rem var(--f-mono);color:var(--accent);width:1em}
details.hint[open] summary::before{content:"–"}
details.hint div{padding:0 12px 10px 32px;color:var(--silk-2)}

/* illustration placeholder (Gemini later) */
.ph{border:2px dashed var(--line);border-radius:var(--r);min-height:170px;display:grid;place-items:center;text-align:center;padding:16px;color:var(--silk-3);
  background:repeating-linear-gradient(135deg,transparent 0 14px,rgba(125,141,176,.07) 14px 28px)}
.ph b{display:block;font:600 .8rem var(--f-display);letter-spacing:.12em;text-transform:uppercase;color:var(--silk-2)}

/* progress */
.bar{height:10px;border-radius:99px;background:var(--board-2);border:1px solid var(--line);overflow:hidden}
.bar i{display:block;height:100%;background:var(--accent);border-radius:99px}
.task{display:grid;grid-template-columns:24px 1fr auto;gap:10px;align-items:center;padding:9px 0;border-top:1px solid var(--line)}
.task:first-of-type{border-top:0}
.tick{width:22px;height:22px;border-radius:5px;border:2px solid var(--silk-3);display:grid;place-items:center;font:700 .8rem var(--f-mono)}
.tick.on{background:var(--ok);border-color:var(--ok);color:#081226}

/* map */
.mapwrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--pad)}
.mapwrap svg{display:block;min-width:1040px;width:100%;height:auto}
.trace{fill:none;stroke:var(--trace-off);stroke-width:5;stroke-linecap:round;stroke-linejoin:round}
.trace.on{stroke:var(--accent);filter:drop-shadow(0 0 5px var(--accent))}
.flow{fill:none;stroke:#fff;stroke-width:2;stroke-dasharray:3 26;stroke-linecap:round;opacity:.75;animation:flow 1.6s linear infinite}
@keyframes flow{to{stroke-dashoffset:-29}}
.st{cursor:pointer}
.st .ring{fill:var(--pad);stroke:var(--trace-off);stroke-width:4}
.st .core{fill:var(--trace-off)}
.st.done .ring{stroke:var(--accent)} .st.done .core{fill:var(--accent)}
.st.now .ring{stroke:var(--silk)} .st.now .core{fill:var(--accent)}
.st.now .pulse{fill:none;stroke:var(--accent);stroke-width:2;animation:pulse 1.8s ease-out infinite;transform-box:fill-box;transform-origin:center}
@keyframes pulse{from{transform:scale(.7);opacity:1}to{transform:scale(1.7);opacity:0}}
.st text{font:700 11px var(--f-body);fill:var(--silk-2);text-anchor:middle}
.st:hover text,.st:focus text{fill:var(--silk)}
.st:focus{outline:none} .st:focus .ring{stroke:var(--warn)}
.maplabel{font:700 12px var(--f-display);letter-spacing:.14em;fill:var(--silk-3)}
.maplabel.big{font-size:15px;fill:var(--accent)}
.chipbody{fill:var(--panel);stroke:var(--accent);stroke-width:3}
.pin{stroke:var(--silk-3);stroke-width:3;stroke-linecap:round}
.legend{display:flex;gap:16px;flex-wrap:wrap;font-size:.84rem;color:var(--silk-2);margin-top:10px}
.legend span{display:inline-flex;gap:6px;align-items:center}
.legend svg{width:20px;height:20px}

/* tracker */
.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(92px,1fr));gap:8px}
.tile{all:unset;cursor:pointer;box-sizing:border-box;border:1px solid var(--line);border-radius:var(--r-sm);padding:9px 8px;background:var(--board-2);display:grid;gap:5px;justify-items:start;min-height:74px}
.tile .cd{font:700 1rem var(--f-mono)}
.tile .rk{display:flex;align-items:center;gap:5px;font:600 .66rem var(--f-display);letter-spacing:.1em;text-transform:uppercase;color:var(--silk-3)}
.tile svg{width:18px;height:18px}
.tile[aria-pressed="true"]{border-color:var(--accent);box-shadow:0 0 0 2px color-mix(in srgb,var(--accent) 35%,transparent)}
.tile.gap{border-color:var(--bad)}

/* heatmap */
table.heat{border-collapse:separate;border-spacing:3px;font-size:.84rem}
table.heat th{font:600 .72rem var(--f-mono);color:var(--silk-2);padding:2px 4px;font-weight:700}
table.heat th.nm{text-align:left;font-family:var(--f-body);font-size:.88rem;color:var(--silk);white-space:nowrap;padding-right:10px}
table.heat td{width:38px;height:30px;border-radius:4px;text-align:center;font:700 .78rem var(--f-mono);color:#081226}
.h0{background:var(--trace-off);color:var(--silk-2)!important} .h1{background:var(--bad)} .h2{background:var(--warn)} .h3{background:var(--ok)}

/* modal */
.modal{position:fixed;inset:0;background:rgba(4,8,20,.72);display:grid;place-items:center;z-index:50;padding:16px}
.modal[hidden]{display:none}
.modal .sheet{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);max-width:760px;width:100%;max-height:92vh;overflow:auto;padding:18px}
.modal canvas{width:100%;height:auto;border-radius:var(--r-sm);border:1px solid var(--line);display:block}

select,input[type=text]{font:400 1rem var(--f-body);background:var(--pad);color:var(--silk);border:1px solid var(--line);border-radius:var(--r-sm);padding:8px 10px}
label.ck{display:inline-flex;gap:7px;align-items:center;margin-right:14px}
hr{border:0;border-top:1px solid var(--line);margin:16px 0}
.sw{border-radius:var(--r-sm);border:1px solid var(--line);overflow:hidden}
.sw i{display:block;height:54px}
.sw div{padding:6px 8px;font:400 .76rem var(--f-mono);background:var(--panel)}
.swatches{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:10px}
.artgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:12px}
.artgrid figure{margin:0;text-align:center;font-size:.74rem;color:var(--silk-2)}
.artgrid svg{width:72px;height:72px}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
/* stop wide tables and code from stretching the page on phones */
.grid > *, .qbody > *, .main, .row > div{min-width:0}
.main{overflow-x:clip}
.qsplit{grid-template-columns:minmax(0,380px) minmax(0,1fr)}
@media (max-width:980px){.qsplit{grid-template-columns:1fr}}
.mp.na .ic{background:var(--trace-off);color:var(--silk)}
@media (max-width:620px){.steps .w{display:none}.steps .here{font-size:.6rem}}

/* generated pictures */
figure.hook{margin:0;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);background:#101a33;position:relative}
figure.hook img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover}
figure.hook figcaption{padding:10px 14px;background:var(--panel);font-size:.9rem;color:var(--silk-2)}
figure.hook figcaption b{color:var(--accent)}
.banner{position:relative;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);margin-bottom:16px;background:#101a33}
.banner img{display:block;width:100%;height:auto;min-height:150px;object-fit:cover;object-position:right center}
.banner-text{position:absolute;left:clamp(16px,3vw,32px);top:50%;transform:translateY(-50%);max-width:46%}
.banner-text h1{margin:.1em 0 .2em}.banner-text p{margin:0;color:#aebbd6}
.banner-text .silk,.banner-text h1{color:#eef2fb}
@media (max-width:620px){.banner img{min-height:170px;object-position:72% center}.banner-text{max-width:60%}.banner-text p{display:none}}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px}
.gallery figure{margin:0}.gallery img{width:100%;height:auto;display:block;border-radius:var(--r-sm);border:1px solid var(--line)}
.gallery figcaption{font-size:.78rem;color:var(--silk-2);margin-top:4px}
.banner img{max-height:300px;aspect-ratio:auto}

/* ---- app additions (Step 4) */
.skip{position:absolute;left:-999px;top:8px;background:var(--panel);color:var(--silk);padding:8px 12px;border-radius:6px;z-index:99}
.skip:focus{left:8px}
#view:focus{outline:none}
body.joining .rail,body.joining .tabbar{display:none}
body.joining .app{grid-template-columns:1fr}
body.joining .main{margin:0 auto}
.join{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:center;max-width:1040px;margin:4vh auto 0}
@media (max-width:860px){.join{grid-template-columns:1fr;margin-top:0}}
.pick button{all:unset;cursor:pointer;border:1px solid var(--line);border-radius:6px;padding:4px 10px;font-size:.84rem;margin:0 6px 6px 0}
.pick button[aria-pressed="true"]{border-color:var(--t1);color:var(--t1)}
.pick button[disabled]{opacity:.45;cursor:not-allowed}
.pick button:focus-visible{outline:3px solid var(--warn)}
.pick .silk{margin:4px 0}
.only-small{display:none}
#toast{position:fixed;left:50%;bottom:84px;transform:translateX(-50%);background:var(--silk);color:var(--board);font-weight:700;padding:10px 16px;border-radius:99px;z-index:60;box-shadow:var(--shadow);max-width:90vw}
#toast[hidden]{display:none}
table.ref{border-collapse:collapse;width:100%;font-size:.88rem}
table.ref td{border-top:1px solid var(--line);padding:7px 8px 7px 0;vertical-align:top}
table.ref td.mono{font-size:.8rem;color:var(--accent)}
table.ref td:last-child{color:var(--t2)}
label{font-size:.9rem;color:var(--silk-2)}
@media (max-width:860px){.only-small{display:flex}.tabbar{grid-template-columns:repeat(5,1fr)}.tabbar a{font-size:.66rem}}
/* ---- Step 5: question engine */
.qnav{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.qchip{min-width:38px;height:38px;border-radius:var(--r-sm);border:1px solid var(--line);background:var(--board-2);color:var(--silk);font:700 .85rem var(--f-mono);cursor:pointer}
.qchip[aria-current=true]{outline:2px solid var(--accent);outline-offset:1px}
.qchip.ok{background:color-mix(in srgb,var(--ok) 28%,var(--board-2));border-color:var(--ok)}
.qchip.no{background:color-mix(in srgb,var(--bad) 26%,var(--board-2));border-color:var(--bad)}
.qchip.pr{border-style:dashed;color:var(--silk-3)}
.qimg{display:block;width:100%;max-width:820px;height:auto;background:#fff;border-radius:var(--r-sm);padding:10px;margin:0 0 10px;border:1px solid var(--line)}
.qbody{display:grid;gap:12px}
.qbody .hint .qimg{margin-top:8px}
.opt{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--board-2);cursor:pointer;font-weight:700}
.opt:has(input:checked){border-color:var(--accent);background:color-mix(in srgb,var(--accent) 18%,var(--board-2))}
textarea.ans.mono{font-family:var(--f-mono);font-size:.92rem}
select#selfScore{font:700 1rem var(--f-mono);padding:4px 8px;border-radius:var(--r-sm);background:var(--board-2);color:var(--silk);border:1px solid var(--line)}
@media (max-width:600px){.qfoot .small.muted{display:none}.qimg{padding:4px}}
/* ---- Step 6: Code Lab */
.lab{border:1px solid var(--line);border-radius:var(--r);background:var(--panel);overflow:hidden}
.lab-bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:10px 12px;border-bottom:1px solid var(--line);background:var(--panel-2)}
.lab-steps{display:inline-flex;gap:6px;align-items:center;flex-wrap:wrap}
.lab-steps[hidden]{display:none}
.lab-steps input[type=range]{width:80px;vertical-align:middle;accent-color:var(--accent)}
.lab-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr)}
.lab-left{border-right:1px solid var(--line);min-width:0;display:flex;flex-direction:column}
.lab-right{display:grid;gap:12px;padding:12px;align-content:start;min-width:0}
.ed{position:relative;display:grid;grid-template-columns:3em 1fr;background:var(--pad);min-height:260px;flex:1}
.ed[hidden],.lab-trace[hidden],.lab-say[hidden]{display:none}
.ed .gut{margin:0;padding:12px 8px 12px 0;text-align:right;color:var(--silk-3);font:400 .92rem/1.6 var(--f-mono);overflow:hidden;user-select:none;max-height:460px}
.ed .gut .bad{color:#fff;background:var(--bad);border-radius:3px;padding:0 3px}
.ed textarea{border:0;resize:vertical;background:transparent;color:var(--silk);font:400 .92rem/1.6 var(--f-mono);padding:12px 12px 12px 4px;min-height:260px;max-height:460px;white-space:pre;overflow:auto;tab-size:4;outline:0}
.ed:focus-within{box-shadow:inset 0 0 0 2px var(--accent)}
.lab-trace{border:0;border-radius:0;max-height:460px;overflow:auto;flex:1}
.lab-say{padding:10px 14px;border-top:1px solid var(--line);background:color-mix(in srgb,var(--accent) 12%,var(--panel-2))}
.lab-ln{font:700 .8rem var(--f-mono);color:var(--accent);display:block;margin-bottom:2px}
.con{background:var(--pad);border:1px solid var(--line);border-radius:var(--r-sm);padding:10px 12px;min-height:90px;max-height:240px;overflow:auto;font:400 .9rem/1.55 var(--f-mono);white-space:pre-wrap;word-break:break-word}
.con .cin{display:inline-block;min-width:8em;width:40%;background:transparent;border:0;border-bottom:2px solid var(--warn);color:var(--silk);font:inherit;outline:0}
.cerr{margin-top:8px;padding:8px 10px;border-radius:var(--r-sm);background:color-mix(in srgb,var(--bad) 16%,transparent);border-left:3px solid var(--bad);white-space:normal;font-family:var(--f-body)}
.vgrp+.vgrp{margin-top:8px}
.vrow{display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}
.var{display:grid;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--board-2);min-width:74px;max-width:100%;overflow:hidden}
.var .vn{font:700 .72rem var(--f-display);letter-spacing:.06em;padding:3px 8px;background:var(--panel-2);color:var(--silk-2)}
.var .vv{font:700 .95rem var(--f-mono);padding:4px 8px;word-break:break-all}
.var .vt{font:400 .68rem var(--f-mono);color:var(--silk-3);padding:0 8px 3px}
.var.chg{border-color:var(--warn);animation:pop .5s ease}
.var.chg .vn{background:color-mix(in srgb,var(--warn) 30%,var(--panel-2));color:var(--silk)}
.var.fn .vv{color:var(--silk-3);font-weight:400}
.stk{display:flex;flex-wrap:wrap;gap:4px;align-items:center;margin-top:4px}
.tests{margin-top:8px}
@media (max-width:860px){.lab-grid{grid-template-columns:1fr}.lab-left{border-right:0;border-bottom:1px solid var(--line)}}
@media (prefers-reduced-motion:reduce){.var.chg{animation:none}}
.var.fn .vt{display:none}
/* ---- Step 7: visual engines (flowchart, trace table, AlgoLab, block builder) */
.alab{border:1px solid var(--line);border-radius:var(--r);background:var(--panel);overflow:hidden;outline:0}
.scrub{flex:1;min-width:110px;accent-color:var(--accent)}
.lab-bar label input[type=range]{width:80px;vertical-align:middle;accent-color:var(--accent)}
.alab-in{display:flex;flex-wrap:wrap;gap:6px 18px;align-items:center;justify-content:space-between;padding:8px 12px;border-bottom:1px solid var(--line)}
.alab-in input.short{width:min(26em,60vw);margin-left:6px}
.alab-tabs{display:none;gap:6px;padding:8px 12px 0}
.alab-tabs [aria-pressed=true]{border-color:var(--accent);color:var(--accent)}
.alab-top{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);border-bottom:1px solid var(--line)}
.alab.is-build .alab-top{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr)}
.alab-top>section{min-width:0;padding:10px 12px;max-height:540px;overflow:auto;scroll-behavior:smooth}
.alab-code{border-right:1px solid var(--line)}
.alab-lines{margin:6px 0 0;font-size:.86rem}
.alab-lines .ln em{font:700 .68rem var(--f-display);letter-spacing:.08em;font-style:normal;margin-left:10px;padding:1px 6px;border-radius:99px;background:var(--warn);color:#1b1400}
.alab-lines .ln em:empty{display:none}
.alab-lines .ln.peek{background:color-mix(in srgb,var(--warn) 22%,transparent)}
.alab-say{border-top:0;min-height:62px}
.alab-say .waitin{display:block;margin-top:6px}
.alab-bot{display:grid;grid-template-columns:minmax(0,1fr) minmax(200px,300px);gap:14px;padding:12px}
.alab-bot>section{min-width:0}
/* flowchart */
.flowhost{margin-top:6px;overflow:auto;text-align:center}
.flowsvg{display:inline-block;max-width:none}
.flowsvg text{font:500 13px var(--f-mono);fill:var(--silk);pointer-events:none}
.flowsvg .fl{font:700 11.5px var(--f-display);letter-spacing:.06em;fill:var(--silk-2)}
.flowsvg .sh{fill:var(--board-2);stroke:var(--trace-off);stroke-width:1.7;transition:fill .25s,stroke .25s}
.flowsvg .sh.in{fill:none}
.flowsvg .k-decision .sh{stroke:color-mix(in srgb,var(--arena) 55%,var(--trace-off))}
.flowsvg .k-io .sh{stroke:color-mix(in srgb,var(--t2) 55%,var(--trace-off))}
.flowsvg .k-terminator .sh{stroke:var(--silk-3)}
.flowsvg .fn{cursor:pointer}
.flowsvg .fn.seen .sh{fill:color-mix(in srgb,var(--accent) 10%,var(--board-2));stroke:color-mix(in srgb,var(--accent) 70%,var(--trace-off))}
.flowsvg .fn.on .sh{fill:color-mix(in srgb,var(--accent) 24%,var(--board-2));stroke:var(--accent);stroke-width:2.8;filter:drop-shadow(0 0 7px color-mix(in srgb,var(--accent) 70%,transparent))}
.flowsvg .fn.on text{font-weight:700}
.flowsvg .wire{fill:none;stroke:var(--trace-off);stroke-width:1.8;transition:stroke .25s}
.flowsvg .ah{fill:var(--trace-off);transition:fill .25s}
.flowsvg .fe.seen .wire{stroke:color-mix(in srgb,var(--accent) 75%,var(--trace-off))}
.flowsvg .fe.seen .ah{fill:color-mix(in srgb,var(--accent) 75%,var(--trace-off))}
.flowsvg .fe.seen .fl,.flowsvg .fe.on .fl{fill:var(--accent)}
.flowsvg .fe.on .wire{stroke:var(--accent);stroke-width:2.6}
.flowsvg .fe.on .ah{fill:var(--accent)}
.flowsvg .pulse{fill:none;stroke:var(--warn);stroke-width:4;stroke-linecap:round;stroke-dasharray:16 4000;stroke-dashoffset:16;opacity:0;filter:drop-shadow(0 0 4px var(--warn))}
.flowsvg .fe.on .pulse{animation:wirepulse .55s cubic-bezier(.4,0,.6,1) forwards}
@keyframes wirepulse{0%{opacity:1;stroke-dashoffset:16}85%{opacity:1}100%{opacity:0;stroke-dashoffset:calc(-1px * var(--len,200))}}
.flowkey{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:.74rem;color:var(--silk-3);margin-top:4px}
.flowkey i{display:inline-block;width:18px;height:10px;border:1.6px solid var(--silk-3);margin-right:5px;vertical-align:-1px}
.flowkey .t{border-radius:6px}.flowkey .io{transform:skewX(-18deg);border-color:var(--t2)}.flowkey .d{width:11px;height:11px;transform:rotate(45deg);border-color:var(--arena);margin-right:8px}
/* trace table */
table.ttx th{text-transform:none;font:700 .8rem var(--f-mono);letter-spacing:0;white-space:nowrap}
table.ttx td{padding:0 8px;font-weight:700;white-space:nowrap}
table.ttx td.new{animation:cellin .6s ease;box-shadow:inset 0 0 0 2px var(--warn)}
table.ttx td.carry{color:var(--silk-3);font-weight:400;opacity:.55}
table.ttx td.ask{padding:0;box-shadow:inset 0 0 0 2px var(--warn);background:color-mix(in srgb,var(--warn) 14%,transparent)}
table.ttx td:has(input){padding:0}
table.ttx input.ok{background:color-mix(in srgb,var(--ok) 24%,transparent)}
table.ttx input.no{background:color-mix(in srgb,var(--bad) 26%,transparent)}
table.ttx td.ask input.no{animation:shake .3s}
.colres.ok{color:var(--ok)}.colres.no{color:var(--bad)}
@keyframes cellin{0%{background:var(--warn);color:#1b1400;transform:scale(1.12)}100%{background:transparent;transform:none}}
@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
/* block builder */
.pal{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.pchip{font:700 .8rem var(--f-display);letter-spacing:.04em;padding:7px 12px;border-radius:var(--r-sm);border:1.6px solid var(--trace-off);background:var(--board-2);color:var(--silk);cursor:grab}
.pchip.k-io{border-color:var(--t2)}.pchip.k-decision{border-color:var(--arena)}
.pchip:hover{background:var(--panel-2)}
.bl{display:grid;gap:0}
.blk{border-radius:var(--r-sm)}
.bh{display:flex;flex-wrap:wrap;align-items:center;gap:6px;padding:6px 8px;border:1.6px solid var(--trace-off);border-left-width:5px;border-radius:var(--r-sm);background:var(--board-2);font:400 .86rem var(--f-mono);cursor:grab}
.bh b{font:700 .78rem var(--f-mono);color:var(--silk-2)}
.bh.k-io{border-color:color-mix(in srgb,var(--t2) 70%,var(--trace-off))}.bh.k-decision{border-color:color-mix(in srgb,var(--arena) 70%,var(--trace-off))}
.blk.on>.bh{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 20%,var(--board-2));box-shadow:0 0 0 2px color-mix(in srgb,var(--accent) 35%,transparent)}
.blk.bad>.bh{border-color:var(--bad)}
.grip{color:var(--silk-3);letter-spacing:-2px;cursor:grab}
.bf{font:700 .86rem var(--f-mono);background:var(--pad);color:var(--silk);border:1px solid var(--line);border-radius:4px;padding:3px 5px;max-width:100%}
.bf:focus{outline:2px solid var(--warn);outline-offset:0}
.bx{margin-left:auto;border:0;background:transparent;color:var(--silk-3);font-size:1.1rem;line-height:1;cursor:pointer;padding:2px 6px;border-radius:4px}
.bx:hover{color:var(--bad);background:color-mix(in srgb,var(--bad) 15%,transparent)}
.bb{margin-left:14px;padding-left:10px;border-left:2px dashed var(--trace-off)}
.bm{font:700 .76rem var(--f-mono);color:var(--silk-3);padding:3px 10px;display:flex;gap:6px;align-items:center}
.slot{display:flex;align-items:center;justify-content:center;width:100%;height:14px;border:0;background:transparent;cursor:pointer;padding:0;position:relative}
.slot span{display:none;font:700 .8rem var(--f-mono);color:#06241f;background:var(--accent);border-radius:99px;width:20px;height:20px;line-height:20px;z-index:1}
.slot::before{content:"";position:absolute;left:0;right:0;top:6px;height:2px;border-radius:2px;background:transparent}
.slot:hover span,.slot:focus-visible span,.slot.on span,.slot.over span{display:block}
.slot.on{height:24px}.slot.on::before{top:11px;background:var(--accent)}
.slot.over{height:30px}.slot.over::before{top:14px;background:var(--warn);height:4px}
.dragging .slot{height:22px}.dragging .slot::before{top:10px;background:color-mix(in srgb,var(--accent) 35%,transparent)}
.bl>.slot:last-child,.bb>.slot:last-child{height:26px}.bl>.slot:last-child span,.bb>.slot:last-child span{display:block;opacity:.55}
.bl>.slot.on:last-child span,.bb>.slot.on:last-child span{opacity:1}
@media (max-width:900px){.alab .alab-top,.alab.is-build .alab-top{grid-template-columns:1fr}.alab.is-build .alab-code{max-height:none}.alab-code{border-right:0}.alab-tabs{display:flex}
  .alab [data-pane]{display:none}.alab:not([data-show=flow]) [data-pane=code],.alab[data-show=flow] [data-pane=flow]{display:block}
  .alab-in label{display:grid;width:100%}.alab-in input.short{width:100%;margin:4px 0 0}
  .alab-top>section{max-height:380px}.alab-bot{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){.flowsvg .fe.on .pulse,table.ttx td.new,table.ttx td.ask input.no{animation:none}.alab-top>section{scroll-behavior:auto}}
.alab-lines .ln{position:relative}
.alab-lines .ln em{position:absolute;right:8px;top:50%;transform:translateY(-50%);margin:0}
/* ---- Step 8: mission template (Learn stations, flip cards, Practise) */
.stations{list-style:none;display:flex;margin:0 0 14px;padding:0;counter-reset:st}
.stations li{flex:1;position:relative;text-align:center}
.stations li+li::before{content:"";position:absolute;left:-50%;right:50%;top:17px;height:3px;background:var(--trace-off)}
.stations li.done+li::before,.stations li.done+li.done::before{background:var(--accent)}
.stations button{all:unset;cursor:pointer;display:grid;justify-items:center;gap:5px;width:100%;position:relative}
.stations .dot{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font:700 .9rem var(--f-mono);background:var(--board-2);border:2.5px solid var(--trace-off);color:var(--silk-2);transition:.2s}
.stations .nm{font:600 .78rem var(--f-display);letter-spacing:.04em;color:var(--silk-3)}
.stations li.done .dot{background:var(--accent);border-color:var(--accent);color:#06241f}
.stations li.here .dot{border-color:var(--warn);box-shadow:0 0 0 4px color-mix(in srgb,var(--warn) 28%,transparent)}
.stations li.here .nm{color:var(--silk)}
.stations button:focus-visible .dot{outline:2px solid var(--silk);outline-offset:3px}
.flips{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px;margin-top:10px}
.flip{all:unset;cursor:pointer;position:relative;min-height:150px;perspective:900px;display:block}
.flip .ff,.flip .fb2{position:absolute;inset:0;border-radius:var(--r);border:1.6px solid var(--line);padding:14px;display:grid;align-content:center;gap:6px;backface-visibility:hidden;transition:transform .45s cubic-bezier(.3,.9,.4,1)}
.flip .ff{background:var(--board-2);text-align:center}
.flip .ff b{font:700 1.15rem var(--f-display)}
.flip .ff i{font:400 .72rem var(--f-mono);color:var(--silk-3);font-style:normal}
.flip .fb2{background:color-mix(in srgb,var(--accent) 12%,var(--panel-2));border-color:var(--accent);transform:rotateY(180deg);font-size:.9rem;align-content:start}
.flip .fb2 b{font:700 .8rem var(--f-display);letter-spacing:.06em;color:var(--accent)}
.flip .fb2 code{font:400 .8rem var(--f-mono);background:var(--pad);padding:3px 6px;border-radius:4px;justify-self:start}
.flip[aria-pressed=true] .ff{transform:rotateY(180deg)}.flip[aria-pressed=true] .fb2{transform:rotateY(360deg)}
.flip:focus-visible .ff,.flip:focus-visible .fb2{outline:2px solid var(--warn);outline-offset:2px}
.notice{margin-top:10px;padding:9px 12px;border-radius:var(--r-sm);border-left:4px solid var(--warn);background:color-mix(in srgb,var(--warn) 14%,transparent)}
.notice.in{animation:noticein .45s ease}
@keyframes noticein{from{transform:translateY(-6px);opacity:0;background:color-mix(in srgb,var(--warn) 45%,transparent)}}
.qc{padding:12px 0;border-top:1px solid var(--line)}.qc:first-of-type{border-top:0}
.qc p{margin:0 0 8px}
.opt2.ok{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 22%,transparent)}
.opt2.no{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 18%,transparent)}
.ask2{display:grid;gap:4px;margin-top:12px;font-weight:700}
.ask2 input.ok{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 18%,transparent)}
.ask2 input.no{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 16%,transparent)}
.sess{margin:12px 0 0}
/* AlgoLab without a flowchart: code on the left, table on the right */
.alab.no-flow [data-pane=flow],.alab.no-flow .alab-tabs{display:none!important}
.alab.no-flow [data-pane=code]{display:block!important}
@media (min-width:901px){.alab.no-flow{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr)}.alab.no-flow>.lab-bar,.alab.no-flow>.alab-in{grid-column:1/-1}
  .alab.no-flow>.alab-top{grid-column:1;grid-row:3/span 2;display:block;border-bottom:0}.alab.no-flow>.alab-say{grid-column:2}.alab.no-flow>.alab-bot{grid-column:2;grid-template-columns:1fr}}
@media (max-width:600px){.stations .nm{font-size:.62rem}.stations .dot{width:30px;height:30px}.stations li+li::before{top:14px}}
@media (prefers-reduced-motion:reduce){.flip .ff,.flip .fb2{transition:none}.notice.in{animation:none}}
/* code must show <= and <> as typed: no font ligatures anywhere */
html,pre,code,input,textarea,table,svg text{font-variant-ligatures:none;font-feature-settings:"liga" 0,"calt" 0}
.stations li.done .dot{font-family:var(--f-body);font-size:1rem}
[hidden]{display:none!important}
.notice{color:var(--silk)}
/* ---- Step 9: game layer */
.chip.hd{border-color:var(--warn);color:var(--warn)}
/* map: boss nodes and themes */
.st.boss .bhex{fill:var(--pad);stroke:var(--bad);stroke-width:3;transition:.2s}
.st.boss .bico{font:700 14px var(--f-display);fill:var(--bad)}
.st.boss.won .bhex{stroke:var(--gold);fill:color-mix(in srgb,var(--gold) 18%,var(--pad))}.st.boss.won .bico{fill:var(--gold)}
.st.boss:hover .bhex,.st.boss:focus-visible .bhex{stroke-width:4.5}
.mapwrap[data-maptheme=copper]{--t1:#e0905a;--t2:#f2c14e;--arena:#d9744a}
.mapwrap[data-maptheme=arctic]{--t1:#7fd3ff;--t2:#c3e9ff;--arena:#9fb6ff}
.mapwrap[data-maptheme=aurora]{--t1:#7cf2a6;--t2:#c48bff;--arena:#6fd6ff}
.mapwrap[data-maptheme=solar]{--t1:#ffd34d;--t2:#ff8f5a;--arena:#ffb347}
/* week strip and retest banner */
.week{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin-top:10px}
.wd{display:grid;justify-items:center;gap:2px;padding:6px 0;border-radius:var(--r-sm);border:1px solid var(--line);background:var(--board-2);font-size:.72rem;color:var(--silk-3)}
.wd b{font:700 1rem var(--f-mono);min-height:1.2em;color:var(--silk)}
.wd.rest{opacity:.55}.wd.today{border-color:var(--accent);box-shadow:0 0 0 2px color-mix(in srgb,var(--accent) 30%,transparent)}
.wd.done{background:color-mix(in srgb,var(--accent) 22%,var(--board-2));border-color:var(--accent)}.wd.done b{color:var(--accent)}
.wd.frz b{color:var(--diamond)}
.dmd{display:flex;gap:12px;align-items:center;flex-wrap:wrap;padding:10px 14px;border-radius:var(--r);border:1px solid var(--line);background:var(--board-2);margin-bottom:12px}
.dmd>div{flex:1;min-width:200px}.dmd.due{border-color:var(--diamond);background:color-mix(in srgb,var(--diamond) 12%,var(--board-2))}
/* question runs */
.runhead{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin:6px 0 12px}
.pips{display:flex;gap:6px;flex-wrap:wrap}
.pip{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font:700 .8rem var(--f-mono);border:2px solid var(--trace-off);background:var(--board-2);color:var(--silk-3)}
.pip.ok{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 25%,var(--board-2));color:var(--silk)}
.pip.part{border-color:var(--warn);color:var(--silk)}.pip.no{border-color:var(--bad);color:var(--silk)}
/* boss */
.bossart{width:100%;height:auto;display:block;overflow:visible}
.bossart .xeyes{display:none}.bossart.down .xeyes{display:block}.bossart.down .eyes,.bossart.down .glitch{display:none}
.bossart.down{filter:grayscale(.85);opacity:.7}
.bossart.idle .body{animation:bob 2.6s ease-in-out infinite}.bossart.idle .glitch{animation:glitch 1.8s steps(2) infinite}
.bossart.idle .eyes rect{animation:blink 4s infinite;transform-box:fill-box;transform-origin:center}
.bossart.hit{animation:hit .45s ease}.bossart.hit .body{fill:color-mix(in srgb,var(--bad) 35%,var(--board-2))}
@keyframes bob{50%{transform:translateY(-3px)}}
@keyframes glitch{0%{transform:translateX(0)}50%{transform:translateX(6px)}}
@keyframes blink{0%,92%,100%{transform:scaleY(1)}95%{transform:scaleY(.1)}}
@keyframes hit{20%{transform:translateX(-8px) rotate(-3deg)}40%{transform:translateX(7px) rotate(2deg)}60%{transform:translateX(-4px)}100%{transform:none}}
.bossstage{max-width:340px;margin:0 auto;padding:10px}
.bossbar{display:flex;gap:12px;align-items:center;margin-bottom:10px;padding:10px 14px;border:1px solid var(--line);border-radius:var(--r);background:var(--panel)}
.bossmini{width:64px;flex:none}
.hp{position:relative;height:22px;border-radius:99px;background:var(--board-2);border:1px solid var(--line);overflow:hidden;margin-top:6px}
.hp i{display:block;height:100%;background:linear-gradient(90deg,var(--bad),#ff8a5c);transition:width .6s cubic-bezier(.3,.9,.4,1)}
.hp span{position:absolute;inset:0;display:grid;place-items:center;font:700 .74rem var(--f-mono);color:var(--silk)}
.trophies{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:8px}
.trophy{display:grid;justify-items:center;gap:2px;text-decoration:none;color:var(--silk-3);padding:6px;border-radius:var(--r-sm);border:1px dashed var(--line)}
.trophy span{width:56px;opacity:.35;filter:grayscale(1)}.trophy.won{border:1px solid var(--gold);color:var(--gold)}.trophy.won span{opacity:1;filter:none}
/* Class Mainframe */
.mf-grid{display:grid;grid-template-columns:minmax(230px,300px) minmax(0,1fr);grid-template-areas:"core rack" "stats rack" "chal chal";gap:16px;align-items:start}
.mf-core{grid-area:core}.mf-rack{grid-area:rack}.mf-chal{grid-area:chal}.mf-stats{grid-area:stats}
.mf-core{display:grid;justify-items:center;text-align:center;gap:4px}
.gauge{width:100%;max-width:240px}
.gauge .g0{fill:none;stroke:var(--board-2);stroke-width:16}
.gauge .g1{fill:none;stroke:var(--t1);stroke-width:16;stroke-linecap:round;transform:rotate(-90deg);transform-origin:center;filter:drop-shadow(0 0 8px color-mix(in srgb,var(--t1) 60%,transparent));transition:stroke-dasharray 1s}
.gauge .fan{transform-origin:100px 100px;animation:spin linear infinite;fill:color-mix(in srgb,var(--t1) 35%,var(--board-2))}
.gauge .hub{fill:var(--pad);stroke:var(--t1);stroke-width:3}
@keyframes spin{to{transform:rotate(360deg)}}
.mf-pct{font:700 2.6rem var(--f-display);line-height:1}
.rack{width:100%;height:auto;display:block}
.rack .bl{fill:var(--board-2);stroke:var(--line);stroke-width:1.5}.rack .handle{fill:var(--trace-off)}
.rack .bt{font:700 15px var(--f-display);fill:var(--t1)}.rack .bn{font:600 10px var(--f-display);letter-spacing:.1em;fill:var(--silk-3)}
.rack .sock{fill:var(--pad);stroke:var(--line)}.rack .vent{fill:var(--pad)}
.rack .led.on{filter:drop-shadow(0 0 5px currentColor);animation:led 3.2s ease-in-out infinite}
@keyframes led{50%{opacity:.55}}
.mf-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:14px 10px}
.mfs{display:grid;gap:2px}.mfs b{font:700 2rem var(--f-display);line-height:1}.mfs span{font-size:.8rem;color:var(--silk-3)}
.bar.big{height:18px}
body.projector .rail,body.projector .tabbar,body.projector #topbar,body.projector .no-proj{display:none!important}
body.projector .main{padding:18px 26px;max-width:none}
body.projector .mf{font-size:1.25rem}body.projector .mf-pct{font-size:4rem}body.projector .mfs b{font-size:3rem}
@media (max-width:860px){.mf-grid{grid-template-columns:1fr;grid-template-areas:"core" "chal" "rack" "stats"}}
@media (prefers-reduced-motion:reduce){.bossart.idle .body,.bossart.idle .glitch,.bossart.idle .eyes rect,.bossart.hit,.gauge .fan,.rack .led.on{animation:none}}
/* ---- Step 10: data structure viewer */
.dvs{display:grid;gap:12px;margin-top:6px;text-align:left}
.dv-host{text-align:left}
.dv{border:1px solid var(--line);border-radius:var(--r-sm);background:var(--board-2);padding:8px 10px;min-width:0}
.dv.fresh{animation:pop .5s ease}
.dv-h{display:flex;gap:8px;align-items:baseline;margin-bottom:6px}
.dv-h b{font:700 .86rem var(--f-mono);color:var(--accent)}.dv-h span{font:400 .7rem var(--f-mono);color:var(--silk-3)}
.dv-row{display:flex;flex-wrap:wrap;gap:4px 0;padding-bottom:16px}
.dv-slot{display:grid;justify-items:center;position:relative;min-width:44px}
.dv-slot>i{font:400 .68rem var(--f-mono);font-style:normal;color:var(--silk-3)}
.dv-slot .dv-c{border-radius:0;border-right-width:0;min-width:44px}
.dv-slot:first-child .dv-c{border-radius:6px 0 0 6px}.dv-slot:last-child .dv-c{border-radius:0 6px 6px 0;border-right-width:1.6px}.dv-slot:only-child .dv-c{border-radius:6px}
.dv-slot>em{position:absolute;top:100%;font:700 .64rem var(--f-mono);font-style:normal;color:var(--warn);white-space:nowrap;margin-top:1px}
.dv-slot.at .dv-c{border-color:var(--warn);border-right-width:1.6px;box-shadow:0 0 0 2px color-mix(in srgb,var(--warn) 30%,transparent);position:relative;z-index:1}
.dv-c{display:inline-grid;place-items:center;min-width:34px;padding:5px 8px;border:1.6px solid var(--trace-off);background:var(--pad);border-radius:6px;font:700 .9rem var(--f-mono);white-space:nowrap}
.dv-c.chg,.dv-t td.chg,.dv-card div.chg dd{background:color-mix(in srgb,var(--warn) 30%,var(--pad));border-color:var(--warn);animation:cellin .6s ease}
.dv-c.no{border-color:var(--bad);color:var(--bad)}
.dv-vars{display:flex;flex-wrap:wrap;gap:8px}
.dv-var{display:grid;justify-items:start;padding:6px 8px}.dv-var .dv-h{margin-bottom:3px}.dv-ty{font:400 .66rem var(--f-mono);color:var(--silk-3);margin-top:2px}
table.dv-t{border-collapse:collapse;font:700 .88rem var(--f-mono)}
.dv-t th{font:400 .7rem var(--f-mono);color:var(--silk-3);padding:2px 8px;text-transform:none;letter-spacing:0;background:none;border:0}
.dv-t.rec tr:first-child th{font-weight:700;color:var(--silk-2);border-bottom:2px solid var(--trace-off);text-align:left}
.dv-t td{border:1.6px solid var(--trace-off);background:var(--pad);padding:5px 10px;text-align:center;min-width:40px}
.dv-t.rec td{text-align:left}
.dv-t th.at{color:var(--warn);font-weight:700}.dv-t td.at{border-color:var(--warn);box-shadow:inset 0 0 0 2px var(--warn)}.dv-t td.rowat,.dv-t tr.rowat td{background:color-mix(in srgb,var(--warn) 12%,var(--pad))}
.dv-card dl{margin:0;display:grid;gap:3px}.dv-card dl div{display:grid;grid-template-columns:8em 1fr;gap:8px}.dv-card dt{font:400 .78rem var(--f-mono);color:var(--silk-3)}.dv-card dd{margin:0;font:700 .88rem var(--f-mono);padding:1px 6px;border-radius:4px}
/* console and file simulator */
.iov{display:grid;gap:10px}
.io-pipe{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:10px;border:1px dashed var(--trace-off);border-radius:var(--r-sm);background:var(--board-2)}
.io-st{display:grid;justify-items:center;gap:3px;padding:6px 10px;border-radius:var(--r-sm);border:1px solid var(--line);background:var(--panel);min-width:84px;text-align:center}
.io-st small{font-size:.68rem;color:var(--silk-3);max-width:15em}.io-cap{font:700 .62rem var(--f-display);letter-spacing:.1em;text-transform:uppercase;color:var(--silk-3)}
.io-st kbd{font:700 .9rem var(--f-mono);padding:4px 10px;border-radius:6px;background:var(--pad);border:1.6px solid var(--silk-3);box-shadow:0 3px 0 var(--trace-off);min-width:2em}
.io-st.mach{border:2px solid var(--arena);background:color-mix(in srgb,var(--arena) 14%,var(--panel))}.io-st.mach b{font:700 1rem var(--f-mono)}
.io-st.mach.fresh b{animation:whirr .6s ease}.io-st.mach.jam{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 14%,var(--panel));animation:shake .3s 2}
.io-st.err small{color:var(--bad)}.io-st.ghost{opacity:.55;border-style:dashed}.io-st.fresh{animation:pop .5s ease}
.io-arr{color:var(--silk-3);font-weight:700}
@keyframes whirr{0%{transform:scale(1)}40%{transform:scale(1.2) rotate(-4deg)}70%{transform:scale(1.1) rotate(3deg)}100%{transform:none}}
.cab{display:grid;gap:8px}
.drawer{border:1.6px solid var(--trace-off);border-radius:var(--r-sm);background:var(--board-2);overflow:hidden;transition:border-color .2s}
.drawer.open{border-color:var(--accent)}.drawer.hot{box-shadow:0 0 0 2px color-mix(in srgb,var(--warn) 40%,transparent)}.drawer.missing{border-color:var(--bad);border-style:dashed}
.dr-front{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:8px 10px;background:var(--panel-2)}
.dr-handle{width:26px;height:8px;border-radius:4px;border:2px solid var(--silk-3);flex:none}.drawer.open .dr-handle{border-color:var(--accent);background:var(--accent)}
.dr-body{padding:6px 8px 8px;background:var(--pad);animation:slidein .3s ease}
@keyframes slidein{from{opacity:0;transform:translateY(-6px)}}
.fl{display:grid;grid-template-columns:2em 1fr auto;gap:6px;font:400 .86rem/1.6 var(--f-mono);padding:0 6px;border-radius:4px}
.fl i{font-style:normal;color:var(--silk-3);text-align:right}.fl em{font-style:normal;font-size:.68rem;color:var(--silk-3);opacity:.6}
.fl.seen{color:var(--silk-3)}.fl.now{background:color-mix(in srgb,var(--warn) 28%,transparent);color:var(--silk);font-weight:700}.fl.new{background:color-mix(in srgb,var(--ok) 24%,transparent);font-weight:700;animation:cellin .6s ease}
.fnote{margin-top:6px;font-size:.78rem;color:var(--silk-2);padding:4px 6px;border-left:3px solid var(--warn)}
/* algorithm animator */
.aa{border:1px solid var(--line);border-radius:var(--r);background:var(--panel);overflow:hidden;outline:0}
.aa-top{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;padding:10px 14px 0}
.aa-title{font:700 1rem var(--f-display)}.aa-count{display:flex;gap:6px}
.aa-stage{position:relative;margin:8px 12px 4px;min-height:120px}
.aa-floor{position:absolute;left:0;right:0;height:5px;border-radius:3px;background:var(--trace-off)}
.aa-item{position:absolute;left:0;top:0;transition:transform .42s cubic-bezier(.3,.9,.4,1),height .3s;display:grid;justify-items:center;align-content:start}
.aa-shape{position:absolute;inset:0;border-radius:6px 6px 2px 2px;background:color-mix(in srgb,var(--accent) 34%,var(--board-2));border:1.6px solid color-mix(in srgb,var(--accent) 70%,var(--trace-off));transition:background .2s,border-color .2s}
.aa-item b{position:relative;font:700 .86rem var(--f-mono);margin-top:5px;z-index:1}
.aa-item>i{position:absolute;top:100%;margin-top:10px;font:400 .66rem var(--f-mono);font-style:normal;color:var(--silk-3)}
.aa-item.cmp .aa-shape{background:color-mix(in srgb,var(--warn) 60%,var(--board-2));border-color:var(--warn);box-shadow:0 0 12px color-mix(in srgb,var(--warn) 50%,transparent)}
.aa-item.cmp b{color:#1b1400}.aa-item.swp .aa-shape{background:var(--arena);border-color:var(--arena)}.aa-item.swp b{color:#fff}
.aa-item.done .aa-shape{background:color-mix(in srgb,var(--ok) 45%,var(--board-2));border-color:var(--ok)}
.aa-item.found .aa-shape{background:var(--ok);border-color:var(--ok);box-shadow:0 0 14px var(--ok)}.aa-item.found b{color:#06241f}
.aa-item.out{opacity:.28}.aa-item.out .aa-shape{background:var(--board-2);border-style:dashed}.aa-item.seen{opacity:.5}
.is-shelf .aa-shape{border-radius:3px;border-left-width:5px}.is-shelf .aa-item b{writing-mode:vertical-rl;margin-top:10px;font-size:.84rem;letter-spacing:.04em}
.aa-ptr{position:absolute;left:0;top:0;transform-origin:left;transition:transform .42s cubic-bezier(.3,.9,.4,1);font:700 .66rem var(--f-display);letter-spacing:.06em;text-transform:uppercase;padding:1px 6px;border-radius:99px;background:var(--silk);color:var(--pad);margin-left:-18px;white-space:nowrap}
.aa-ptr.p-mid,.aa-ptr.p-i{background:var(--warn);color:#1b1400;margin-top:16px}.aa-ptr.p-high{margin-left:-6px}.aa-ptr.p-low{margin-left:-30px}
.aa-say{border-top:1px solid var(--line);min-height:64px}.aa-ask:empty{display:none}
.aa-pass{padding:0 14px 14px}.aa-pass th{font:400 .72rem var(--f-mono);color:var(--silk-3);text-align:left;padding-left:10px;background:none;border:0}
.aa.compact .aa-say{min-height:0;font-size:.86rem}.aa.compact .lab-ln{display:none}
.mg-row{display:grid;grid-template-columns:54px 1fr;align-items:center;gap:8px;padding:5px 0;border-radius:6px}
.mg-row.hl{background:color-mix(in srgb,var(--accent) 12%,transparent)}
.mg-lab{font:700 .64rem var(--f-display);letter-spacing:.1em;text-transform:uppercase;color:var(--silk-3);text-align:right}
.mg-row.join .mg-lab{color:var(--accent)}
.mg-groups{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 14px}
.mg-g{display:inline-flex;gap:2px;padding:3px;border:1.6px solid var(--trace-off);border-radius:8px;background:var(--board-2);min-height:36px;min-width:34px;animation:pop .4s ease}
.mg-g b{display:grid;place-items:center;min-width:26px;height:26px;border-radius:5px;background:var(--pad);font:700 .86rem var(--f-mono)}
.mg-row.join .mg-g{border-color:color-mix(in srgb,var(--accent) 60%,var(--trace-off))}.mg-g.building{border-color:var(--warn);border-style:dashed}.mg-g b.took{background:var(--warn);color:#1b1400;animation:cellin .5s ease}
.mg-act{display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:center;margin-top:8px;padding:8px;border-top:1px dashed var(--trace-off)}
.mg-g.src b.used{opacity:.25;text-decoration:line-through}.mg-g.src b.head{background:var(--warn);color:#1b1400}
.race-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:10px 0}.race [data-pick][aria-pressed=true]{border-color:var(--accent);color:var(--accent)}
.race>.lab-bar{border:1px solid var(--line);border-radius:var(--r)}.race-res{border-radius:var(--r);border:1px solid var(--line)}
/* hotspot explorer */
.hs{border:1px solid var(--line);border-radius:var(--r);background:var(--panel);overflow:hidden}
.hs-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr)}
.hs-code{margin:0;border:0;border-radius:0;padding:12px;display:grid;gap:0;transition:gap .45s cubic-bezier(.3,.9,.4,1)}
.hs-part{all:unset;display:block;position:relative;border-left:4px solid transparent;border-radius:6px;transition:margin .45s cubic-bezier(.3,.9,.4,1),padding .45s,background .3s,border-color .3s,box-shadow .3s;cursor:pointer}
.hs-tag{position:absolute;right:8px;top:-9px;font:700 .64rem var(--f-display);letter-spacing:.08em;text-transform:uppercase;padding:1px 8px;border-radius:99px;background:var(--pc);color:#0b1226;opacity:0;transform:translateY(6px);transition:.35s;pointer-events:none}
.hs.open .hs-code{gap:12px}
.hs.open .hs-part{border-left-color:var(--pc);background:color-mix(in srgb,var(--pc) 10%,transparent);padding:6px 0;box-shadow:0 0 0 1px color-mix(in srgb,var(--pc) 40%,transparent)}
.hs.open .hs-tag{opacity:1;transform:none}
.hs.open .hs-part:hover,.hs-part:focus-visible{background:color-mix(in srgb,var(--pc) 22%,transparent)}
.hs.open .hs-part.on{background:color-mix(in srgb,var(--pc) 26%,transparent);box-shadow:0 0 0 2px var(--pc)}
.hs-info{padding:16px;border-left:1px solid var(--line);align-self:start;position:sticky;top:0}
/* layered map */
.lm-grid{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(240px,1fr);gap:16px;align-items:start}
.lm-map svg{width:100%;height:auto;display:block;border-radius:var(--r);border:1px solid var(--line)}
.lm-land{fill:#dfe6cf}[data-theme=dark] .lm-land{fill:#c9d2b6}
.lm-layer{transition:opacity .45s}.lm-layer.off{opacity:0}
.lm-layers{display:grid;gap:6px}
.lm-sw{display:flex;align-items:center;gap:10px;cursor:pointer;font-weight:700}
.lm-sw input{position:absolute;opacity:0}
.lm-sw .sw{width:40px;height:22px;border-radius:99px;background:var(--board-2);border:1.6px solid var(--trace-off);position:relative;transition:.2s;flex:none}
.lm-sw .sw::after{content:"";position:absolute;left:2px;top:2px;width:15px;height:15px;border-radius:50%;background:var(--silk-3);transition:.2s}
.lm-sw input:checked+.sw{background:color-mix(in srgb,var(--accent) 40%,var(--board-2));border-color:var(--accent)}.lm-sw input:checked+.sw::after{left:20px;background:var(--accent)}
.lm-sw input:focus-visible+.sw{outline:2px solid var(--warn);outline-offset:2px}
/* builders */
.pcard{font:600 .88rem var(--f-body);text-align:left;padding:8px 12px;border-radius:var(--r-sm);border:1.6px solid var(--trace-off);background:var(--panel-2);color:var(--silk);cursor:grab;max-width:100%}
.pcard:hover{border-color:var(--silk-3)}.pcard.sel{border-color:var(--warn);box-shadow:0 0 0 3px color-mix(in srgb,var(--warn) 35%,transparent)}
.pcard.no{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 16%,var(--panel-2))}.pcard.ok{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 16%,var(--panel-2))}
.pcard.sub{border-color:var(--accent);font-weight:700}
.pb-tray{border:1px dashed var(--trace-off);border-radius:var(--r);padding:10px 12px;background:var(--board-2)}
.pb-cards{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px;min-height:38px}
.pb-cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:12px}
.pb-col{border:1.6px solid var(--line);border-radius:var(--r);padding:10px;background:var(--panel);min-height:150px;transition:.15s}
.pb-col .pb-cards{flex-direction:column}
.placing [data-zone]{border-color:var(--accent);border-style:dashed}.placing [data-zone]:hover,[data-zone].over{background:color-mix(in srgb,var(--accent) 14%,var(--panel));border-color:var(--accent)}
.lio-list{display:grid}
.lio-slot{height:8px;border-radius:4px;transition:.12s}.placing .lio-slot{height:16px;background:color-mix(in srgb,var(--accent) 16%,transparent)}.lio-slot.over,.placing .lio-slot:hover{background:var(--accent)}
.lio-line{display:flex;align-items:center;gap:8px;padding:5px 8px;border:1.6px solid var(--trace-off);border-radius:var(--r-sm);background:var(--pad);cursor:grab;transition:margin .2s}
.lio-line code{font:700 .88rem var(--f-mono);flex:1;white-space:pre-wrap}
.lio-line.sel{border-color:var(--warn)}.lio-line.no{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 14%,var(--pad))}.lio-line.ok{border-color:var(--ok)}
.lio-btns{display:flex;gap:2px}.lio-btns button{all:unset;cursor:pointer;width:28px;height:28px;display:grid;place-items:center;border-radius:5px;color:var(--silk-2);font-size:.8rem}
.lio-btns button:hover:not(:disabled){background:var(--panel-2);color:var(--silk)}.lio-btns button:disabled{opacity:.25;cursor:default}.lio-btns button:focus-visible{outline:2px solid var(--warn)}
.dt-root{display:grid;justify-items:center;gap:2px;margin:0 auto;width:fit-content;max-width:100%;padding:10px 18px;border:2px solid var(--accent);border-radius:var(--r);background:color-mix(in srgb,var(--accent) 12%,var(--panel))}
.dt-fan{height:26px;margin:0 calc(50% / var(--n));border:2px solid var(--trace-off);border-bottom:0;border-radius:8px 8px 0 0;position:relative;margin-top:14px}
.dt-fan::before{content:"";position:absolute;left:50%;top:-16px;height:14px;border-left:2px solid var(--trace-off)}.dt-fan::after{content:"";position:absolute;left:50%;top:0;height:100%;border-left:2px solid var(--trace-off)}
.dt-branches{display:grid;grid-template-columns:repeat(var(--n),minmax(0,1fr));gap:10px;margin-bottom:14px}
.dt-b{display:grid;gap:8px;align-content:start}
.dt-head,.dt-tasks{border:1.6px solid var(--line);border-radius:var(--r-sm);padding:8px;background:var(--panel);display:grid;gap:6px;min-height:48px;align-content:center}
.dt-head{border-color:color-mix(in srgb,var(--accent) 50%,var(--line))}.dt-tasks{min-height:96px;align-content:start;margin-left:14px;position:relative}
.dt-stub{margin:0;padding:8px 10px;font-size:.78rem;animation:pop .5s ease;margin-left:14px}
/* logic sandbox */
.ll{border:1px solid var(--line);border-radius:var(--r);background:var(--panel);overflow:hidden}
.ll-presets{display:flex;flex-wrap:wrap;gap:6px;padding:8px 12px;border-bottom:1px solid var(--line);align-items:center}.ll-presets .chip{cursor:pointer;font-family:var(--f-mono)}
.ll-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:0}
.ll-circuit{padding:14px;border-right:1px solid var(--line);overflow:auto}.ll-table{padding:14px;min-width:0}
.lsvg{width:100%;height:auto;display:block}
.lw{fill:none;stroke:var(--trace-off);stroke-width:3;stroke-linejoin:round;transition:stroke .2s}.lw.on{stroke:var(--warn);filter:drop-shadow(0 0 4px color-mix(in srgb,var(--warn) 70%,transparent))}
.ldot{fill:var(--trace-off)}.ldot.on{fill:var(--warn)}
.lg{fill:var(--board-2);stroke:var(--silk-2);stroke-width:2.2;transition:.2s}.lgate.on .lg{stroke:var(--warn);fill:color-mix(in srgb,var(--warn) 18%,var(--board-2))}
.lgt{font:700 10px var(--f-display);letter-spacing:.06em;fill:var(--silk);text-anchor:middle}.lval{font:700 12px var(--f-mono);fill:var(--silk-3)}.lgate.on .lval{fill:var(--warn)}
.lsw{cursor:pointer;outline:0}.swbg{fill:var(--board-2);stroke:var(--trace-off);stroke-width:2;transition:.2s}.swk{fill:var(--silk-3);transition:.2s}
.lsw.on .swbg{fill:color-mix(in srgb,var(--warn) 30%,var(--board-2));stroke:var(--warn)}.lsw.on .swk{fill:var(--warn)}.lsw:focus-visible .swbg{stroke:var(--silk);stroke-width:3}
.swv{font:700 11px var(--f-mono);fill:var(--silk-2);text-anchor:middle}.swn{font:700 13px var(--f-mono);fill:var(--silk);text-anchor:middle}
.bulb{fill:var(--board-2);stroke:var(--silk-3);stroke-width:2.5;transition:.25s}.fil{fill:none;stroke:var(--silk-3);stroke-width:2;transition:.25s}
.lamp.on .bulb{fill:var(--warn);stroke:var(--warn);filter:drop-shadow(0 0 16px var(--warn))}.lamp.on .fil{stroke:#6b4a00}
.ll-table th.fin{color:var(--warn)}.ll-table tr.cur td{box-shadow:inset 0 2px 0 var(--warn),inset 0 -2px 0 var(--warn)}.ll-table tbody tr{cursor:pointer}
.ll-table td.hid{background:repeating-linear-gradient(135deg,transparent 0 6px,color-mix(in srgb,var(--trace-off) 40%,transparent) 6px 8px)}
.ll-table td.okc{background:color-mix(in srgb,var(--ok) 22%,transparent)}.ll-table td.noc{background:color-mix(in srgb,var(--bad) 22%,transparent)}.ll-table td small{color:var(--silk-2);font-weight:400}
.tgl{all:unset;display:block;width:100%;text-align:center;cursor:pointer;font:700 1rem var(--f-mono);padding:6px 0;min-width:44px}.tgl:focus-visible{outline:2px solid var(--warn);outline-offset:-2px}
@media (max-width:900px){.hs-grid,.lm-grid,.ll-grid,.race-grid{grid-template-columns:1fr}.hs-info{border-left:0;border-top:1px solid var(--line);position:static}.ll-circuit{border-right:0;border-bottom:1px solid var(--line)}
  .pb-cols{grid-template-columns:repeat(2,minmax(0,1fr))}.dt-branches{grid-template-columns:1fr}.dt-fan{display:none}.dt-tasks,.dt-stub{margin-left:14px}.lio-btns button{width:34px;height:34px}}
@media (prefers-reduced-motion:reduce){.aa-item,.aa-ptr,.hs-part,.hs-code,.hs-tag,.lm-layer{transition:none}.dv.fresh,.dv-c.chg,.io-st.fresh,.io-st.mach.fresh b,.io-st.mach.jam,.dr-body,.mg-g,.dt-stub,.fl.new{animation:none}}
*,*::before,*::after{font-variant-ligatures:none!important;font-feature-settings:"liga" 0,"calt" 0!important}
.lab-right{overflow:hidden}.lab-right>section{min-width:0}.lab-right .dvs,.lab-right .iov{min-width:0}.io-pipe{overflow-x:auto}
.hs-part,.hs-plain{min-width:0}.hs-code .ln{grid-template-columns:2.4em minmax(0,1fr)}.hs-code .ln span{white-space:pre-wrap;overflow-wrap:anywhere}
/* ---- Step 11: mission kit (three views, twin view, task kinds) */
.tv{display:grid;gap:12px}
.tv-steps{padding:12px 14px}
.tv-steps ol{list-style:none;margin:8px 0 0;padding:0;display:grid;gap:6px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.tv-steps button{all:unset;box-sizing:border-box;text-align:left;cursor:pointer;display:grid;grid-template-columns:30px 22px 1fr;gap:8px;align-items:center;width:100%;min-height:44px;padding:6px 10px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--panel);font-size:.95rem;line-height:1.35;transition:border-color .2s,background .2s}
.tv-steps button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.tv-steps .tv-n{font:700 .8rem var(--f-display);color:var(--silk-3);text-align:center}
.tv-steps .tv-bot{width:30px;height:30px;opacity:0;transform:translateX(-6px) scale(.8);transition:opacity .25s,transform .25s}
.tv-steps button.on{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 16%,var(--panel))}
.tv-steps button.on .tv-bot{opacity:1;transform:none}
.tv-steps button.on .tv-n{color:var(--accent)}
.flowsvg .fn.peek .sh{stroke:var(--warn);stroke-width:2.6;fill:color-mix(in srgb,var(--warn) 18%,var(--board-2))}
.twin{border:1px solid var(--line);border-radius:var(--r);background:var(--panel);overflow:hidden;outline:0}
.twin>p{padding:0 12px}
.twin-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0;border-top:1px solid var(--line);margin-top:8px}
.twin-grid section{padding:10px 12px;min-width:0}
.twin-grid section+section{border-left:1px solid var(--line)}
.twin-grid pre{margin:6px 0 0;font-size:.86rem;overflow-x:auto}
.twin-rule{padding:9px 14px;border-top:1px solid var(--line);border-left:4px solid var(--warn);background:color-mix(in srgb,var(--warn) 10%,var(--panel-2));min-height:2.6em}
.twin-rule code{background:var(--pad);padding:1px 6px;border-radius:4px}
.twin-bot{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);border-top:1px solid var(--line)}
.twin-bot section{padding:10px 12px;min-width:0}.twin-bot section+section{border-left:1px solid var(--line)}
.twin-bot .con{min-height:60px}
.twin-vars{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.tvar{display:inline-grid;grid-auto-flow:column;gap:6px;align-items:center;padding:4px 9px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--pad);font:400 .85rem var(--f-mono)}
.tvar b{color:var(--silk-2);font-weight:700}
.tvar.new{border-color:var(--accent);animation:tvarIn .5s ease}
@keyframes tvarIn{from{background:color-mix(in srgb,var(--accent) 35%,var(--pad))}}
.twin>.row{padding:0 12px 12px}
.kit-given{margin-bottom:12px}.kit-given pre{margin:6px 0 0}
.kit-qgrid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px;align-items:start}
.kit-qgrid.solo{grid-template-columns:1fr}
.kit-src pre{margin:6px 0 0}
.kit-src .kit-flow{margin:6px 0 10px;max-height:560px;overflow:auto;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--board-2);padding:8px}
#tflow{max-height:520px;overflow:auto;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--board-2);padding:8px;margin-top:6px}
.kit-asks .ask2:first-child{margin-top:0}
.kq .row{margin-top:2px}.kq .opt2{text-align:left;font-weight:400;white-space:normal}
.kq .opt2[aria-pressed="true"]:not(.ok):not(.no){border-color:var(--accent)}
.kit .tests{list-style:none;padding:0;margin:10px 0 0;display:grid;gap:4px}
.kit .tests li{padding:6px 10px;border-radius:var(--r-sm);border:1px solid var(--line);font-size:.92rem}
.kit .tests li.ok{border-color:color-mix(in srgb,var(--ok) 60%,var(--line))}.kit .tests li.no{border-color:color-mix(in srgb,var(--bad) 60%,var(--line))}
.kit-asks{margin-top:10px}
pre.code.py .ln span{color:var(--silk)}
@media (max-width:860px){.twin-grid,.twin-bot,.kit-qgrid{grid-template-columns:1fr}.twin-grid section+section,.twin-bot section+section{border-left:0;border-top:1px solid var(--line)}}
@media (prefers-reduced-motion:reduce){.tv-steps .tv-bot,.tv-steps button{transition:none}.tvar.new{animation:none}}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
/* bug lab */
.bug-lines{margin:6px 0 0;font-size:.88rem}
.bug-lines .ln{align-items:center}
.bug-pick{all:unset;box-sizing:border-box;cursor:pointer;white-space:pre;flex:1;min-height:26px;padding:1px 6px;border-radius:4px;font:inherit}
.bug-pick:hover,.bug-pick:focus-visible{background:color-mix(in srgb,var(--warn) 18%,transparent);outline:1px dashed var(--warn)}
.bug-lines .ln.fixed .bug-pick{background:color-mix(in srgb,var(--accent) 18%,transparent);box-shadow:inset 3px 0 0 var(--accent)}
.bug-edit{white-space:pre;flex:1;display:flex}
.bug-edit input{flex:1;min-width:0;font:inherit;color:var(--silk);background:var(--board);border:1px solid var(--warn);border-radius:4px;padding:2px 6px}
.bug-res,.tlab-res{margin-top:10px;width:100%}
.bug-res tr.ok td:last-child,.tlab-res tr.ok td:last-child{color:var(--ok);font-weight:700}
.bug-res tr.no td:last-child,.tlab-res tr.no td:last-child{color:var(--bad);font-weight:700}
.bug-res tr.no td:nth-child(3),.tlab-res tr.no td:nth-child(3){color:var(--bad)}
/* test lab */
.tlab-req{padding:9px 12px;border-left:4px solid var(--accent);background:color-mix(in srgb,var(--accent) 10%,var(--panel-2));border-radius:var(--r-sm)}
.tlab-line{position:relative;height:108px;margin:14px 18px 0}
.tlab-axis{position:absolute;left:0;right:0;top:56px;height:3px;background:var(--silk-3);border-radius:2px}
.tlab-band{position:absolute;top:62px;height:16px;background:color-mix(in srgb,var(--ok) 20%,transparent);border:1px solid color-mix(in srgb,var(--ok) 55%,transparent);border-radius:4px;font:700 .68rem var(--f-display);letter-spacing:.06em;color:var(--ok);text-align:center;line-height:16px;font-size:.62rem;overflow:hidden;white-space:nowrap}
.tlab-tick{position:absolute;top:52px;width:1px;height:11px;background:var(--silk-3)}
.tlab-tick i{position:absolute;top:30px;left:50%;transform:translateX(-50%);font:400 .72rem var(--f-mono);font-style:normal;color:var(--silk-3)}
.tlab-pin{position:absolute;top:4px;transform:translateX(-50%);display:grid;place-items:center;width:28px;height:28px;border-radius:50%;font-weight:700;animation:pinDrop .35s ease}
.tlab-pin::after{content:"";position:absolute;bottom:-14px;left:50%;width:2px;height:14px;background:currentColor}
.tlab-pin i{position:absolute;top:-16px;font:700 .7rem var(--f-mono);font-style:normal}
.tlab-pin.ok{background:color-mix(in srgb,var(--ok) 30%,var(--panel));color:var(--ok);border:2px solid var(--ok)}
.tlab-pin.no{background:color-mix(in srgb,var(--bad) 30%,var(--panel));color:var(--bad);border:2px solid var(--bad)}
@keyframes pinDrop{from{transform:translate(-50%,-18px);opacity:0}}
.tchip.ok{border-color:var(--ok)}.tchip.no{border-color:var(--bad);color:var(--bad)}
.tlab-res tr.new td{animation:tvarIn .6s ease}
@media (prefers-reduced-motion:reduce){.tlab-pin,.tlab-res tr.new td{animation:none}}