/* Red Shell · Common Errors viewer
   Same palette as the slide deck so the course reads as one thing.

   One colour code everywhere:
     red     the mistake: a flagged row, a field at fault, a missing milestone
     yellow  the exact words to look at, marked inside the task's own text
     green   what it should have been, and task text that already does it right
     blue    a task file you can open, and links
   Task content sits on panels headed "From the task" or "Task file". Everything
   else is the course talking about it. */
:root{
  --bg:#080d1a; --bg2:#0c1426; --card:#101a30; --card2:#0e1729; --paper:#0b1323;
  --line:#1d2b47; --line2:#26375a;
  --ink:#e8eefb; --ink2:#a9b8d4; --ink3:#7084a8;
  --red:#ff4d63; --red-d:#7a1b2b; --red-bg:#1e0f1a;
  --blue:#4d9bff; --blue-d:#1b3a6b;
  --green:#3ddc97; --green-d:#1d5c46; --green-bg:#0b1f1b;
  --amber:#ffb84d; --orange:#ff8a3d;
  --spot:#ffe066; --spot-ink:#15171b;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
  --sans:"Segoe UI",Inter,system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.6 var(--sans);
  -webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{margin:0;line-height:1.2;letter-spacing:-.02em}
code{font-family:var(--mono);font-size:.88em}
[hidden]{display:none !important}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.sp{flex:1}
.skip{position:absolute;left:-9999px;top:8px;z-index:99;background:var(--card);color:var(--ink);
  padding:8px 12px;border-radius:8px}
.skip:focus{left:12px}

/* the exact words: yellow in every panel, as on a golden page */
mark{border-radius:3px;padding:0 2px}
mark.spot{background:var(--spot);color:var(--spot-ink);box-shadow:0 0 0 1px var(--red)}
mark.spot.cur{box-shadow:0 0 0 2px var(--red),0 0 0 5px rgba(255,77,99,.3)}
mark.good{background:rgba(61,220,151,.16);color:#d3ffe9;box-shadow:inset 0 -2px 0 var(--green)}

/* header */
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:12px 24px;background:rgba(8,13,26,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:650;letter-spacing:.01em;
  white-space:nowrap}
.bd{width:9px;height:9px;background:var(--red);border-radius:2px;box-shadow:0 0 12px var(--red)}
.top nav{display:flex;gap:18px;font-size:13.5px;flex-wrap:wrap;justify-content:flex-end}
.top nav a{color:var(--ink2)}
.top nav a[aria-current]{color:var(--ink);box-shadow:inset 0 -2px 0 var(--red)}

/* Back to slides, on every page reached from an example on the slides: fixed at the bottom left,
   above the example and its evidence. The page and the dialog keep a strip free for it, so it
   never covers anything, Expand included. */
.toslides{position:fixed;left:16px;bottom:14px;z-index:60;display:inline-flex;align-items:center;gap:9px;
  height:42px;padding:0 18px 0 13px;border-radius:999px;background:var(--blue);color:#06122a;
  font:700 14px/1 var(--sans);text-decoration:none;white-space:nowrap;
  box-shadow:0 10px 28px rgba(0,0,0,.5),0 0 0 1px rgba(255,255,255,.12) inset}
.toslides:hover{background:#6aacff;text-decoration:none}
.toslides:focus-visible{outline:2px solid #fff;outline-offset:3px}
.toslides svg{width:16px;height:16px;flex:none;fill:none;stroke:currentColor;stroke-width:2.2;
  stroke-linecap:round;stroke-linejoin:round}
.toslides small{font-size:12.5px;font-weight:650;padding-left:9px;border-left:1px solid rgba(6,18,42,.35)}
html.fromslides body{padding-bottom:70px}
html.fromslides .ovback,html.fromslides .ovback.wide{padding-bottom:70px}

/* hero */
.hero{padding:52px 24px 30px;max-width:1180px;margin:0 auto}
.hero.slim{padding-bottom:10px}
.eyebrow{margin:0 0 12px;color:var(--red);font-size:11.5px;font-weight:700;letter-spacing:.18em;
  text-transform:uppercase}
.hero h1{font-size:clamp(30px,5vw,48px);font-weight:800}
.lede{max-width:68ch;color:var(--ink2);font-size:16px;margin:14px 0 0}

.wrap{max-width:1180px;margin:0 auto;padding:0 24px 80px}

/* badges: what a mistake costs */
.bad{flex:none;display:inline-block;font-size:10px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;
  padding:4px 8px;border-radius:5px;white-space:nowrap;line-height:1.3}
.bad.fail{background:var(--red-bg);color:var(--red);border:1px solid var(--red-d)}
.bad.bleed{background:#1c1a2a;color:var(--amber);border:1px solid #4a3a1c}
.bad.core{background:#1f140f;color:var(--orange);border:1px solid #5c3217}
.mcf{display:inline-block;background:#1b1430;color:#c4a4ff;border:1px solid #4a3277;font-size:10px;font-weight:700;
  letter-spacing:.09em;text-transform:uppercase;padding:3px 7px;border-radius:5px;white-space:nowrap}

/* index: filters, sections, cards */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.fchip{background:var(--card);border:1px solid var(--line2);color:var(--ink2);border-radius:999px;
  padding:6px 13px;font:inherit;font-size:13px;cursor:pointer}
.fchip b{color:var(--ink);margin-left:4px;font-variant-numeric:tabular-nums}
.fchip:hover{border-color:var(--blue);color:var(--ink)}
.fchip.on{background:#14203b;border-color:var(--blue);color:var(--ink)}
.fchip.f-fail.on{border-color:var(--red)}
.fchip.f-core.on{border-color:var(--orange)}
.fchip.f-bleed.on{border-color:var(--amber)}
.nomatch{color:var(--ink3);margin-top:40px}
.sec{margin-top:46px}
.sech{display:flex;gap:16px;align-items:flex-start;padding-bottom:14px;border-bottom:1px solid var(--line)}
.secn{flex:none;width:34px;height:34px;display:grid;place-items:center;border:1px solid var(--red-d);
  color:var(--red);border-radius:9px;font-weight:700;font-size:15px}
.sech h2{font-size:21px}
.sech p{margin:6px 0 0;color:var(--ink3);max-width:80ch;font-size:13.5px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:12px;margin-top:18px}
.mi{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);
  border-left:3px solid var(--line2);border-radius:12px;padding:15px 17px;color:var(--ink);transition:.14s}
.mi:hover{border-left-color:var(--red);background:var(--card2);text-decoration:none;transform:translateY(-1px)}
.mi[data-cost=fail]{border-left-color:var(--red-d)}
.mih{display:flex;gap:10px;align-items:baseline}
.min{flex:none;color:var(--ink3);font-family:var(--mono);font-size:12px}
.mi h3{font-size:15.5px;font-weight:650}
.mi p{margin:8px 0 0;color:var(--ink2);font-size:13.5px;flex:1}
.mif{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:12px}
.mix{color:var(--ink3);font-size:12px;white-space:nowrap}

/* ─── a mistake's page ───────────────────────────────────────────────────── */
.mpage{padding-top:26px}
.mtop{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.crumb{flex:1;min-width:0;color:var(--ink3);font-size:12.5px;margin:0}
.cs{margin:0 8px;color:var(--line2)}
.mnav{display:flex;align-items:center;gap:12px;font-size:12.5px}
.mnav .pos{color:var(--ink3);font-variant-numeric:tabular-nums}
.mnav .off{color:var(--line2)}
.mhead{margin-top:16px}
.mhead h1{font-size:clamp(24px,3.4vw,34px);font-weight:800;max-width:30ch}
.mnum{color:var(--ink3);font-family:var(--mono);font-size:.55em;font-weight:600;margin-right:12px;
  vertical-align:.3em;letter-spacing:0}
.sevline{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:12px 0 0}
.dim{color:var(--blue);font-family:var(--mono);font-size:12px}

/* the mistake and the fix, side by side */
.gist{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}
.gw,.gf{border-radius:12px;padding:16px 18px;border:1px solid var(--line)}
.gw{background:var(--red-bg);border-color:var(--red-d);border-top:3px solid var(--red)}
.gf{background:var(--green-bg);border-color:var(--green-d);border-top:3px solid var(--green)}
.gl{font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;font-weight:750}
.gw .gl{color:var(--red)}
.gf .gl{color:var(--green)}
.gw .gl::before{content:"\2717  "}
.gf .gl::before{content:"\2713  "}
.gw p,.gf p{margin:8px 0 0;font-size:15px;line-height:1.55}
.note{margin-top:12px;padding:11px 15px;border-radius:10px;background:#131c33;border:1px solid var(--blue-d);
  color:var(--ink2);font-size:13.5px}
.note b{color:var(--blue);margin-right:6px}

.blk{margin-top:34px}
.blkh{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px}
.blk h2{font-size:19px;letter-spacing:-.01em}
.hint{color:var(--ink3);font-size:13px}
.catch p{margin:9px 0 0;color:var(--ink);font-size:14.5px;max-width:92ch;padding:12px 16px;
  background:var(--card2);border:1px solid var(--line);border-left:3px solid var(--blue);border-radius:10px}

/* what the colours mean, once, beside the examples */
.legend{display:flex;flex-wrap:wrap;gap:6px 16px;margin:8px 0 0;color:var(--ink3);font-size:12px}
.lg::before{content:"";display:inline-block;width:18px;height:11px;margin-right:6px;border-radius:3px;vertical-align:-1px}
.lg-y::before{background:var(--spot);box-shadow:0 0 0 1px var(--red)}
.lg-r::before{background:var(--red-bg);border:1.5px solid var(--red)}
.lg-m::before{border:1.5px dashed var(--red)}
.lg-g::before{background:rgba(61,220,151,.16);box-shadow:inset 0 -2px 0 var(--green)}
.lg-b::before{background:#0d1a33;border:1px solid var(--blue)}

/* the real tasks, one card each: each card is the diagnosis itself */
.exlist{display:grid;grid-template-columns:1fr;gap:14px;margin-top:14px}
.excard{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);
  border-left:3px solid var(--red);border-radius:12px;padding:14px 16px 12px;color:var(--ink);cursor:pointer;
  transition:.14s}
.excard:hover{border-color:var(--line2);border-left-color:var(--red)}
.exh{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.exn{color:var(--red);font-size:11px;font-weight:750;letter-spacing:.12em;text-transform:uppercase}
.exm{color:var(--ink3);font-size:12px}
.exctx{margin:8px 0 0;color:var(--ink2);font-size:13.5px;line-height:1.5}
/* What is wrong: the mistake in a sentence or two, before anything else on the card and the rail */
.exgist{margin:10px 0 0;color:var(--ink);font-size:14.5px;line-height:1.5;font-weight:500}
.exgist .xl,.rsec.wrongr .rl{color:var(--red)}
.rsec.wrongr p{color:var(--ink);font-size:14.5px;font-weight:500}
.xl{display:block;color:var(--ink3);font-size:10.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  margin-bottom:3px}
.exf{display:flex;align-items:center;gap:14px;margin-top:10px}
.exfull{font-size:12.5px}
.btn{background:var(--card);border:1px solid var(--line2);color:var(--ink);border-radius:7px;
  padding:5px 11px;font:inherit;font-size:12.5px;cursor:pointer}
.btn:hover{background:var(--card2);border-color:var(--blue)}
.btn.q{color:var(--ink2);border-color:var(--line)}
.exopen{background:#14203b;border-color:var(--blue-d);color:var(--ink);font-weight:600}

.jl{color:var(--ink3);font-size:10.5px;letter-spacing:.09em;text-transform:uppercase;margin-right:2px}
.evjump{border-radius:6px;padding:3px 9px;font:inherit;font-size:12px;cursor:pointer;line-height:1.4;
  background:#0d1a33;border:1px solid var(--blue-d);color:#9cc8ff}
.evjump:hover{border-color:var(--blue);color:#fff}

/* a reference inside the prose: jumps to what it names */
.ref{background:none;border:0;padding:0;margin:0;font:inherit;color:#8fc0ff;cursor:pointer;
  text-align:inherit;border-bottom:1px dotted #5f8fcf;line-height:inherit}
.ref:hover{color:#fff;border-bottom-style:solid}
.ref.q{color:inherit;border-bottom:1px solid rgba(255,224,102,.55);background:rgba(255,224,102,.07)}
.ref.q:hover{background:rgba(255,224,102,.18)}

/* ─── the diagnosis: where it shows beside what it should have been ────────
   Each line names where it sits in the task (a chip that opens it there), the one
   field at fault or the one that changes, and its words: the task's quoted, the
   course's plain, the words at fault in yellow and the right ones in green. */
.dx{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}
.dxc{min-width:0;border-radius:10px;padding:10px 12px 12px;border:1px solid var(--line)}
.dxw{background:var(--red-bg);border-color:var(--red-d)}
.dxr{background:var(--green-bg);border-color:var(--green-d)}
.dxl{font-size:10.5px;font-weight:750;letter-spacing:.1em;text-transform:uppercase;margin:0 0 9px}
.dxw .dxl{color:var(--red)}
.dxr .dxl{color:var(--green)}
.dxw .dxl::before{content:"\2717  "}
.dxr .dxl::before{content:"\2713  "}
.dls{display:grid;gap:9px}
.dl{min-width:0;border-left:3px solid var(--line2);padding:1px 0 1px 10px}
.dl.l-was{border-left-color:var(--red)}
.dl.l-ctx{border-left-color:var(--blue-d)}
.dl.l-now{border-left-color:var(--green)}
.dl.miss{border-left-style:dashed}
.dlh{display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.dlw{flex:none;font-size:11.5px;font-weight:650;color:var(--ink2);background:#0a1224;border:1px solid var(--line2);
  border-radius:5px;padding:0 7px;line-height:1.55}
a.ref.dlw{font-size:11.5px;font-weight:650;padding:0 7px;border-radius:5px;background:#0a1224;
  color:#d7e7ff;border:1px solid var(--line2);line-height:1.55}
a.ref.dlw::after{content:" \2197";color:var(--blue);font-weight:400}
a.ref.dlw:hover{border-color:var(--blue);color:#fff;text-decoration:none}
.dl.l-was .dlw{border-color:var(--red-d)}
.dl.l-now .dlw{border-color:var(--green-d)}
.dl.miss .dlw{border-style:dashed;border-color:var(--red)}
.dlt{margin-top:4px;font-size:13.5px;line-height:1.55;overflow-wrap:anywhere}
.dq{color:var(--ink)}
.dq::before{content:"\201C";color:var(--ink3)}
.dq::after{content:"\201D";color:var(--ink3)}
.df{color:var(--ink2)}
.dl.miss .df{color:#ffc2cc;font-style:italic}
.dn{display:block;margin-top:2px;color:var(--ink3);font-size:12px}
.dlt code,.dm code{font-size:.9em}
mark.dm,a.dm{border-radius:3px;padding:0 2px}
.dm.wrong{background:var(--spot);color:var(--spot-ink);box-shadow:0 0 0 1px var(--red)}
.dm.right{background:rgba(61,220,151,.16);color:#d3ffe9;box-shadow:inset 0 -2px 0 var(--green)}
a.ref.dm{border-bottom:0;line-height:inherit;padding:0 2px;border-radius:3px}
a.ref.dm.wrong{color:var(--spot-ink)}
a.ref.dm.right{color:#d3ffe9}
a.ref.dm:hover{box-shadow:0 0 0 2px var(--blue);text-decoration:none}
.dl .w,.dl .f{font-size:10.5px}
.w.fixed,.f.fixed{border:1.5px solid var(--green);background:#0f2a20;color:#d3ffe9;box-shadow:0 0 0 3px rgba(61,220,151,.15)}
.f.fixed em{color:#8fe3bd}
.dl .w.fault,.dl .f.fault{box-shadow:none}
.op{font-size:10px;font-weight:750;letter-spacing:.08em;text-transform:uppercase;border-radius:4px;padding:1px 6px}
.op-delete .op{background:#2c0f1a;color:#ff9aa9;border:1px solid var(--red-d)}
.op-add .op{background:#0f2a20;color:#8fe3bd;border:1px solid var(--green-d)}
.op-keep .op{background:#0a1224;color:var(--ink3);border:1px solid var(--line2)}
.op-delete .dlw{text-decoration:line-through;text-decoration-color:var(--red)}
.dxwhy{margin:12px 0 0;font-size:14px;line-height:1.55;color:var(--ink)}
.dxrule{margin:10px 0 0;padding:8px 12px;border-left:3px solid var(--blue);background:#0d1730;border-radius:0 8px 8px 0;
  font-size:13px;line-height:1.55;color:var(--ink2)}
.rlink{color:var(--blue);font-family:var(--mono);font-size:12px}
.rlink b{color:var(--ink2);font-family:var(--sans);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;font-weight:700}
.dxrule q{color:var(--ink)}
.dxm{display:block;margin-top:3px;color:var(--ink3);font-size:12px}
.rulecard.lit,.railrule.lit{border-color:var(--blue);box-shadow:0 0 0 3px rgba(77,155,255,.25)}

/* the rules, quoted from the project's own documents */
.rulecard{margin-top:12px;background:#0d1730;border:1px solid var(--line);
  border-left:3px solid var(--blue);border-radius:11px;padding:14px 17px}
.rsrc{margin:0 0 8px;color:var(--blue);font-family:var(--mono);font-size:12px}
.rsrc b{color:var(--ink2);font-family:var(--sans);font-size:11px;letter-spacing:.1em;text-transform:uppercase}
.rulecard blockquote,.railrule blockquote{margin:0;color:var(--ink);font-size:14.5px;line-height:1.6;max-width:94ch}
.rcm{margin:9px 0 0;padding-top:8px;border-top:1px dashed var(--line2);color:var(--ink2);font-size:13.5px;max-width:94ch}
.morerules{margin-top:12px}
.morerules>summary,.why>summary{cursor:pointer;color:var(--blue);font-size:13.5px;list-style:none}
.morerules>summary::-webkit-details-marker,.why>summary::-webkit-details-marker,
.rrules>summary::-webkit-details-marker,.xtoc summary::-webkit-details-marker{display:none}
.morerules>summary::before,.why>summary::before,.rrules>summary::before{content:"\25B8";display:inline-block;
  width:14px;transition:transform .12s}
.morerules[open]>summary::before,.why[open]>summary::before,.rrules[open]>summary::before{transform:rotate(90deg)}
.why{border-top:1px solid var(--line);padding-top:18px}
.why>summary{color:var(--ink);font-size:16px;font-weight:650}
.why p{margin:10px 0 0;color:var(--ink2);font-size:14.5px;max-width:92ch}
.fullx{margin:16px 0 0;color:var(--ink3);font-size:13px}
.fullx.big{margin-top:30px;padding:14px 16px;background:var(--card2);border:1px solid var(--line);border-radius:10px;
  font-size:14px;color:var(--ink2)}

.pager{display:flex;justify-content:space-between;gap:16px;margin-top:36px;padding-top:20px;
  border-top:1px solid var(--line);font-size:13.5px}

/* checklist */
.cl{display:grid;gap:10px;margin-top:18px}
.clsec{margin-top:32px}
.clsec h2{font-size:18px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.cli{display:flex;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:12px 15px;cursor:pointer}
.clb{flex:none;width:18px;height:18px;border:1.5px solid var(--line2);border-radius:5px;margin-top:2px;
  background:none;padding:0;cursor:pointer;display:grid;place-items:center;color:var(--bg);font-size:12px}
.cli.done{opacity:.55}
.cli.done .clb{background:var(--green);border-color:var(--green)}
.cli.done .clb::after{content:"\2713";font-weight:800}
.cli p{margin:0;font-size:14px}
.cli a{font-size:12px;color:var(--ink3);display:inline-block;margin-top:4px}

footer{border-top:1px solid var(--line);padding:24px;text-align:center;color:var(--ink3);font-size:12.5px}

/* ─── the task, opened over the error rather than on a page of its own ───── */
.ovback{position:fixed;inset:0;z-index:50;background:rgba(4,7,15,.76);backdrop-filter:blur(3px);
  display:flex;align-items:center;justify-content:center;padding:16px;animation:ovin .14s ease-out}
@keyframes ovin{from{opacity:0}to{opacity:1}}
.ov{display:flex;flex-direction:column;width:min(1380px,100%);height:min(100%,960px);min-height:0;
  background:var(--bg);border:1px solid var(--line2);border-radius:14px;
  box-shadow:0 24px 70px rgba(0,0,0,.6);overflow:hidden}
.ovback.wide{padding:0}
.ovback.wide .ov{width:100%;height:100%;border-radius:0}
.ovh{flex:none;display:grid;gap:5px;padding:11px 16px;background:var(--bg2);border-bottom:1px solid var(--line)}
.ovline{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.ovnum{color:var(--red);font-size:11.5px;font-weight:750;letter-spacing:.12em;text-transform:uppercase}
.ovttl{font-weight:650;font-size:15px}
.ovmeta{display:flex;flex-wrap:wrap;gap:14px;color:var(--ink3);font-size:12px}
.ovid{font-family:var(--mono);background:#0a1224;border:1px solid var(--line);padding:1px 6px;
  border-radius:5px;font-size:11px;color:var(--ink3)}
.ovbody{flex:1;min-height:0;display:flex}

/* the rail: the course talking about the task */
.ovrail{flex:none;width:380px;overflow:auto;padding:14px 16px 20px;background:var(--bg2);
  border-right:1px solid var(--line)}
.ovbody.railoff .ovrail{display:none}
.railh{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.railh .eyebrow{margin:0;font-size:10.5px}
.raillist{display:grid;gap:12px}
.rsec{margin:0}
.rsec p{margin:5px 0 0;font-size:13.5px;line-height:1.55;color:var(--ink2)}
.rl{font-size:10.5px;font-weight:750;letter-spacing:.1em;text-transform:uppercase;color:var(--ink3)}
.rsec.ctx p{font-size:13px;color:var(--ink3)}
.tq{font-style:italic}
.tqs{font-size:11.5px !important;margin-top:2px !important}
.rsec.badr{background:var(--red-bg);border:1px solid var(--red-d);border-left:3px solid var(--red);
  border-radius:10px;padding:10px 12px}
.rsec.badr .rl{color:var(--red)}
.rsec.badr .rl::before{content:"\2717  "}
.rsec.badr p{color:var(--ink);font-size:14px}
.rsec.goodr{background:var(--green-bg);border:1px solid var(--green-d);border-left:3px solid var(--green);
  border-radius:10px;padding:10px 12px}
.rsec.goodr .rl{color:var(--green)}
.rsec.goodr .rl::before{content:"\2713  "}
.rsec.goodr p{color:var(--ink)}
.rsec.why p{color:var(--ink2)}
.rrules{border-top:1px solid var(--line);padding-top:10px}
.rrules>summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:6px}
.rrules>summary .rl{color:var(--blue)}
.rcount{background:#0d1a33;border:1px solid var(--blue-d);color:#9cc8ff;border-radius:4px;padding:0 6px;
  font-size:10.5px;font-family:var(--mono)}
.railrule{margin-top:9px;background:#0d1730;border:1px solid var(--line);border-left:3px solid var(--blue);
  border-radius:9px;padding:10px 12px}
.railrule .rsrc{font-size:10.5px;margin-bottom:6px}
.railrule blockquote{font-size:12.5px;line-height:1.55}
.railrule .rcm{margin:7px 0 0;font-size:12px}
.ovrail .fullx{margin:2px 0 0;font-size:12.5px}

/* the task's own fields, tabbed */
.ovev{flex:1;min-width:0;display:flex;flex-direction:column}
.ovtabs{flex:none;display:flex;align-items:flex-end;gap:4px;overflow-x:auto;padding:9px 12px 0;
  border-bottom:1px solid var(--line);scrollbar-width:thin}
.ovtab{flex:none;background:transparent;border:1px solid transparent;border-bottom:0;color:var(--ink3);
  border-radius:8px 8px 0 0;padding:7px 12px;font:inherit;font-size:12.5px;cursor:pointer;white-space:nowrap}
.ovtab:hover{color:var(--ink)}
.ovtab.on{background:var(--card);border-color:var(--line);color:var(--ink);font-weight:600}
.tn2{margin-left:7px;background:var(--red-bg);color:#ffc2cc;border:1px solid var(--red-d);
  border-radius:4px;padding:0 5px;font-size:10px;font-family:var(--mono)}
.evtabb{color:#8fbfff}
.evtabb::before{content:"";display:inline-block;width:6px;height:6px;margin-right:7px;border-radius:50%;
  background:var(--blue);vertical-align:middle}
.showrail{display:none;color:var(--blue)}
.ovbody.railoff .showrail{display:block}
.keys{flex:none;color:var(--ink3);font-size:11px;padding:0 4px 8px;white-space:nowrap}
kbd{font-family:var(--mono);font-size:10.5px;background:#0a1224;border:1px solid var(--line2);border-radius:4px;
  padding:0 4px;color:var(--ink2)}
.ovpanes{flex:1;min-height:0;overflow:auto;padding:12px}
.ovpane{display:none}
.ovpane.on{display:block}

/* a panel of task content: headed so it cannot be mistaken for the course's words */
.panel{background:var(--paper);border:1px solid var(--line);border-radius:11px}
.ph{position:sticky;top:-12px;z-index:3;display:flex;align-items:center;gap:10px;padding:8px 12px;
  background:#0b1425;border-bottom:1px solid var(--line);border-radius:11px 11px 0 0}
.src{flex:none;color:var(--bg);background:var(--ink3);font-size:9.5px;font-weight:800;letter-spacing:.1em;
  text-transform:uppercase;padding:2px 7px;border-radius:4px}
.pht{color:var(--ink2);font-size:12px;font-weight:600;min-width:0;overflow:hidden;text-overflow:ellipsis;
  white-space:nowrap}
.stepper{flex:none;display:inline-flex;align-items:center;border:1px solid var(--red-d);border-radius:7px;
  overflow:hidden;background:var(--red-bg)}
.stepper .stp,.stepper .stn{background:none;border:0;color:#ffc2cc;font:inherit;font-size:12px;cursor:pointer;
  padding:3px 9px;line-height:1.4}
.stepper .stp{font-size:15px;padding:1px 9px}
.stepper .stp:hover:not(:disabled),.stepper .stn:hover{background:#2c1422;color:#fff}
.stepper .stp:disabled{color:#6b3a47;cursor:default}
.stepper .stn{border-left:1px solid var(--red-d);border-right:1px solid var(--red-d);font-variant-numeric:tabular-nums}
.pb{padding:14px}
.prose{color:var(--ink2);font-size:14px;white-space:pre-wrap;overflow-wrap:anywhere}

.turn{position:relative;display:flex;gap:12px;padding:10px 0;border-bottom:1px dashed var(--line)}
.turn:last-child{border-bottom:0;padding-bottom:0}
.tn{flex:none;width:64px;color:var(--ink3);font-size:10.5px;font-weight:700;letter-spacing:.07em;
  text-transform:uppercase;padding-top:2px}
.tt{color:var(--ink2);font-size:13.5px;white-space:pre-wrap;overflow-wrap:anywhere;min-width:0}

.rows{display:grid;gap:8px}
.row{position:relative;display:flex;gap:12px;padding:11px 13px;background:var(--card2);
  border:1px solid var(--line);border-left:3px solid var(--line2);border-radius:9px}
.row.flagged,.turn.flagged,.gm.flagged{border-color:var(--red-d);border-left:3px solid var(--red);
  background:var(--red-bg)}
.turn.flagged,.gm.flagged{border-width:1px 1px 1px 3px;border-style:solid;border-radius:9px;padding:13px 14px;
  margin:4px 0}
.row.gap{background:transparent;border:1.5px dashed var(--red);border-left-width:3px}
.row.gap .rt{color:#ffc2cc;font-style:italic}
.rnote{margin:0 0 7px;color:#ffb3bf;font-size:12px;line-height:1.45}
.rnote::before{content:"Marked ";color:var(--red);font-weight:700;font-size:10px;letter-spacing:.1em;text-transform:uppercase}
.ptr{position:absolute;top:-9px;right:12px;background:var(--red);color:#fff;font-size:9.5px;
  font-weight:800;letter-spacing:.1em;text-transform:uppercase;padding:2px 8px;border-radius:4px;
  max-width:70%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rn{flex:none;min-width:28px;height:22px;padding:0 4px;display:grid;place-items:center;background:#0a1224;
  border:1px solid var(--line2);border-radius:5px;font-family:var(--mono);font-size:11.5px;color:var(--ink3)}
.row.flagged .rn{border-color:var(--red-d);color:#ffc2cc}
.rc{flex:1;min-width:0}
.rt{font-size:13.5px;color:var(--ink);overflow-wrap:anywhere}
.rm{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px;align-items:center;font-size:11px;color:var(--ink3)}
.mt,.mc,.f{font-family:var(--mono);font-size:11px;background:#0a1224;border:1px solid var(--line);
  padding:1px 7px;border-radius:5px;color:var(--ink)}
.mt em,.mc em,.f em{color:var(--ink3);font-style:normal;margin-right:6px;font-size:9.5px;letter-spacing:.06em;
  text-transform:uppercase;font-family:var(--sans)}
.mc{color:#9cc8ff}
.w{font-family:var(--mono);font-weight:700;font-size:11.5px;padding:1px 7px;border-radius:5px}
.w-hi{background:#12283f;color:#7cc0ff;border:1px solid var(--blue-d)}
.w-mid{background:#0f2133;color:#63a8e8;border:1px solid #1a3454}
.w-lo{background:#101a2c;color:var(--ink3);border:1px solid var(--line)}
.w-neg{background:#2a0f18;color:var(--red);border:1px solid var(--red-d)}
/* the one field at fault on a row: ringed, the rest of the row left plain */
.mt.fault,.mc.fault,.f.fault,.w.fault{border:1.5px solid var(--red);background:#2c0f1a;color:#fff;
  box-shadow:0 0 0 3px rgba(255,77,99,.18)}
.mt.fault em,.mc.fault em,.f.fault em{color:#ff9aa9}
.fields{display:flex;flex-wrap:wrap;gap:8px;margin-top:9px}
.cont{margin:9px 0 0;padding-left:18px;color:var(--ink2);font-size:12.5px}
.cont li{margin:2px 0}
.cont li.miss{list-style:none;margin:6px 0 0 -18px;padding:4px 9px;border:1.5px dashed var(--red);border-radius:7px;
  color:#ffc2cc;font-style:italic}
.cont li.miss::before{content:"missing  ";color:var(--red);font-style:normal;font-weight:800;font-size:9.5px;
  letter-spacing:.1em;text-transform:uppercase}
.cont.empty{padding-left:0;color:var(--red);font-style:italic}

.files{display:grid;gap:6px}
.file{display:flex;align-items:center;gap:10px;padding:7px 11px;background:var(--card2);
  border:1px solid var(--line);border-radius:8px;font-size:13px}
.file code{color:var(--ink);flex:1;min-width:0;overflow-wrap:anywhere}
.fx,.fs{flex:none;color:var(--ink3);font-size:11px;font-family:var(--mono)}
.file .evjump{flex:none}

.gm{position:relative;padding:10px 0;border-bottom:1px dashed var(--line)}
.gm:last-child{border-bottom:0;padding-bottom:0}
.gr{color:#9cc8ff;font-size:10.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;margin-bottom:5px}
.gt{color:var(--ink2);font-size:13.5px;white-space:pre-wrap;overflow-wrap:anywhere}

.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:9px}
.tile{background:var(--card2);border:1px solid var(--line);border-radius:9px;padding:11px 13px}
.tile.fault{border:1.5px solid var(--red);background:var(--red-bg)}
.tile.wide{grid-column:1/-1}
.tv{font-size:21px;font-weight:750;font-variant-numeric:tabular-nums}
.tile.fault .tv{color:var(--red)}
.tl{color:var(--ink3);font-size:11px;margin-top:3px}
.wsv{display:flex;flex-wrap:wrap;gap:12px;font-size:14px}
.wsp{display:inline-flex;align-items:center;gap:5px}
.wsp b{font-weight:600;color:var(--ink2);font-size:13px}

/* one shared note per panel, instead of the same banner on every row */
.pnote{padding:9px 14px;background:var(--red-bg);border-bottom:1px solid var(--red-d);
  color:#ffc9d2;font-size:12.5px;line-height:1.5}
.pnote b,.evnote b{font-size:10px;letter-spacing:.1em;text-transform:uppercase;margin-right:7px}
.pnote b{color:var(--red)}
.pmore{padding:9px 14px;border-top:1px dashed var(--line);color:var(--ink3);font-size:12px}

/* the spot the stepper is on: rows, fields and figures get a ring, words get theirs above */
.spot.cur:not(mark){box-shadow:0 0 0 2px var(--red),0 0 0 6px rgba(255,77,99,.2)}
tr.spot.cur td{box-shadow:inset 0 2px 0 var(--red),inset 0 -2px 0 var(--red)}
.pulse{animation:pulsering 1.6s ease-out}
@keyframes pulsering{0%,100%{box-shadow:0 0 0 0 rgba(255,77,99,0)}
  14%{box-shadow:0 0 0 5px rgba(255,77,99,.55)}60%{box-shadow:0 0 0 5px rgba(255,77,99,.2)}}
mark.pulse{animation:markpulse 1.6s ease-out}
@keyframes markpulse{0%,100%{box-shadow:0 0 0 2px var(--red),0 0 0 5px rgba(255,77,99,.3)}
  20%{box-shadow:0 0 0 2px var(--red),0 0 0 10px rgba(255,224,102,.45)}}

/* ─── evidence: the files an example turns on, opened where the claim is made ─ */
.evnote{padding:10px 14px;background:#0f1a30;border-bottom:1px solid var(--blue-d);color:var(--ink2);
  font-size:13px;line-height:1.5}
.evnote b{color:var(--blue)}
.ev{display:grid;gap:16px}
.ev.evpair{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.evi{min-width:0}
.evh{display:flex;align-items:baseline;gap:10px;margin-bottom:8px}
.evh code{color:var(--ink);overflow-wrap:anywhere}
.evr{flex:none;color:var(--ink3);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase}
.evimg{display:block;width:100%;padding:0;border:1px solid var(--line);border-radius:9px;background:#05080f;
  cursor:zoom-in;overflow:auto;max-height:70vh}
.evimg img{display:block;max-width:100%;max-height:68vh;width:auto;height:auto;margin:0 auto}
.evimg.full{cursor:zoom-out;max-height:none}
.evimg.full img{max-width:none;max-height:none}
/* a PDF, drawn page by page */
.evpdf{display:grid;gap:14px}
.evpg{margin:0;border:1px solid var(--line);border-radius:9px;overflow:hidden;background:#fff}
.evpg img{display:block;width:100%;height:auto}
.evpg figcaption{padding:5px 10px;background:var(--bg2);color:var(--ink3);font-size:11.5px;border-top:1px solid var(--line)}
.evmedia{display:block;width:100%;max-height:64vh;background:#000;border:1px solid var(--line);border-radius:9px}
audio.evmedia{max-height:none;background:transparent;border:0}
.evmarks{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:0 0 10px}
.evmark{background:var(--red-bg);border:1px solid var(--red-d);color:var(--ink2);border-radius:6px;padding:5px 10px;
  font:inherit;font-size:12px;cursor:pointer;text-align:left}
.evmark:hover{border-color:var(--red);color:var(--ink)}
.evmark b{color:#ffc2cc;font-family:var(--mono);font-weight:600;margin-right:8px}
.evframe{border:1px solid var(--line);border-radius:9px;overflow:hidden;background:#fff}
.evframe iframe{display:block;width:100%;height:max(440px,62vh);border:0;background:#fff}
.ovback.wide .evframe iframe{height:max(480px,calc(100vh - 230px))}
.evtext{margin:0;max-height:64vh;overflow:auto;padding:12px 14px;background:#0a1224;border:1px solid var(--line);
  border-radius:9px;color:var(--ink2);font:12.5px/1.55 var(--mono);white-space:pre-wrap;overflow-wrap:anywhere}
.evtab{max-height:62vh;overflow:auto;border:1px solid var(--line);border-radius:9px;background:#0a1224}
.evtab table{border-collapse:collapse;font:11.5px/1.4 var(--mono);color:var(--ink2);min-width:100%}
.evtab th{position:sticky;top:0;background:#0b1425;color:var(--ink3);text-align:left;font-weight:600;
  padding:6px 9px;border-bottom:1px solid var(--line2);white-space:nowrap}
.evtab td{padding:4px 9px;border-bottom:1px solid var(--line);white-space:nowrap;max-width:260px;
  overflow:hidden;text-overflow:ellipsis}
.evtab tr.hit td{background:var(--spot);color:var(--spot-ink)}
.evtab td.nil{color:var(--red);font-style:italic;outline:2px dashed var(--red);outline-offset:-3px;background:#fff3b0}
.evcut{margin-top:7px;color:var(--ink3);font-size:11.5px}

/* ─── the explanations, published beside the viewer ──────────────────────── */
.xwrap{display:grid;grid-template-columns:270px minmax(0,1fr);gap:40px;align-items:start}
.xtoc{position:sticky;top:64px;max-height:calc(100vh - 80px);overflow:auto;font-size:13px;padding-bottom:20px}
.xtoc summary{cursor:pointer;color:var(--ink3);font-size:11px;font-weight:700;letter-spacing:.12em;
  text-transform:uppercase;list-style:none;margin-bottom:8px}
.toc,.toc ol{list-style:none;margin:0;padding:0}
.toc>li{margin:10px 0}
.toc ol{margin:4px 0 0 2px;border-left:1px solid var(--line);padding-left:10px}
.toc ol li{margin:3px 0}
.toc a{color:var(--ink2)}
.toc a span{color:var(--ink3);font-family:var(--mono);font-size:11px;margin-right:7px}
.toc a.tsec{color:var(--ink);font-weight:600}
.xdoc{max-width:80ch;font-size:15px;line-height:1.65;color:var(--ink2)}
.xdoc [id]{scroll-margin-top:72px}
.xdoc h2{color:var(--ink);font-size:24px;margin:48px 0 12px;padding-top:24px;border-top:1px solid var(--line)}
.xdoc h2:first-child{margin-top:8px;border-top:0;padding-top:0}
.xdoc h3{color:var(--ink);font-size:19px;margin:38px 0 6px;display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px}
.xdoc h4{color:var(--ink);font-size:15px;margin:22px 0 6px}
.xdoc h4 a{font-weight:500}
.xdoc p{margin:10px 0}
.xdoc strong{color:var(--ink)}
.xdoc blockquote{margin:12px 0;padding:10px 16px;background:#0d1730;border-left:3px solid var(--blue);
  border-radius:0 9px 9px 0;color:var(--ink);font-size:14.5px}
.xdoc blockquote p{margin:6px 0}
.xdoc blockquote strong{color:var(--blue);font-weight:600}
.xdoc table{border-collapse:collapse;width:100%;font-size:13.5px;margin:14px 0}
.xdoc th,.xdoc td{border:1px solid var(--line);padding:7px 10px;text-align:left;vertical-align:top}
.xdoc th{background:var(--card);color:var(--ink)}
.xdoc hr{border:0;border-top:1px solid var(--line);margin:34px 0}
.xdoc code{background:#0a1224;border:1px solid var(--line);border-radius:4px;padding:0 4px}
.xdoc ol,.xdoc ul{padding-left:22px}
.xdoc .sev{display:inline-block;margin:4px 0 6px;padding:4px 10px;border-radius:6px;font-size:13px}
.sev-fail{background:var(--red-bg);border:1px solid var(--red-d)}
.sev-core{background:#1f140f;border:1px solid #5c3217}
.sev-bleed{background:#1c1a2a;border:1px solid #4a3a1c}
.toviewer{font-size:12.5px;font-weight:500;letter-spacing:0;white-space:nowrap}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none !important;transition:none !important}
  html{scroll-behavior:auto}
}

/* ─── narrow screens ─────────────────────────────────────────────────────── */
@media (max-width:980px){
  .ovback{padding:0}
  .ov{border-radius:0;height:100%;width:100%}
  .ovbody{flex-direction:column}
  .ovrail{width:auto;max-height:42%;border-right:0;border-bottom:1px solid var(--line)}
  .keys{display:none}
  .xwrap{grid-template-columns:1fr;gap:10px}
  .xtoc{position:static;max-height:none}
  .xtoc details:not([open]) summary{margin-bottom:0}
}
@media (max-width:760px){
  .gist,.dx{grid-template-columns:1fr}
  .exlist,.grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .hero{padding:32px 16px 20px}.wrap{padding:0 16px 56px}.top{padding:10px 16px}
  .top{flex-direction:column;align-items:flex-start;gap:6px}
  .mnav .pos{display:none}
  .ovh{padding:10px 12px}
  .ovline .ovwide{display:none}
}