/* ============================================================
   The Long/Short Desk — shared shell styles
   Used by every page. Page-specific rules stay in the page.
   ============================================================ */
/* ---------- Theme tokens: light = ledger paper (default) ---------- */
:root{
  --bg:#F3EEE2;
  --surface:#FBF7EE;
  --surface-2:#EDE5D3;
  --line:#DBD0B8;
  --line-strong:#C7BA9C;
  --ink:#221F18;
  --ink-dim:#5B5646;
  --ink-faint:#8A8271;
  --accent:#9A6B12;      /* signal gold, deep enough for paper */
  --accent-soft:#EFE0BC;
  --long:#2E7D52;        /* gains / long book */
  --short:#B4432F;       /* losses / short book / risk */
  --info:#2E6B8C;        /* interactive highlight */
  --grid:#E4DBC5;
  --shadow:0 1px 2px rgba(40,34,18,.06), 0 8px 30px rgba(40,34,18,.08);
  color-scheme:light;
}
/* System default (no stamp) on a dark OS -> cockpit dark */
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0D1417;
    --surface:#131F22;
    --surface-2:#1A292C;
    --line:#2A3A3D;
    --line-strong:#3A4C4F;
    --ink:#ECE6D8;
    --ink-dim:#A3B2B0;
    --ink-faint:#6C7E7C;
    --accent:#E0A82E;
    --accent-soft:#33301f;
    --long:#5BB88A;
    --short:#E0705F;
    --info:#7BB5D4;
    --grid:#1E2E31;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 10px 34px rgba(0,0,0,.45);
    color-scheme:dark;
  }
}
/* Explicit dark choice wins in both directions */
:root[data-theme="dark"]{
  --bg:#0D1417;
  --surface:#131F22;
  --surface-2:#1A292C;
  --line:#2A3A3D;
  --line-strong:#3A4C4F;
  --ink:#ECE6D8;
  --ink-dim:#A3B2B0;
  --ink-faint:#6C7E7C;
  --accent:#E0A82E;
  --accent-soft:#33301f;
  --long:#5BB88A;
  --short:#E0705F;
  --info:#7BB5D4;
  --grid:#1E2E31;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 10px 34px rgba(0,0,0,.45);
  color-scheme:dark;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
:root{
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,serif;
  --mono:"SFMono-Regular","SF Mono","JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
}

.wrap{max-width:960px;margin:0 auto;padding:0 22px}

/* ---------- Header ---------- */
header.masthead{
  border-bottom:1px solid var(--line);
  padding:52px 0 34px;
  margin-bottom:8px;
}
.kicker{
  font-family:var(--mono);
  font-size:12px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--accent);margin:0 0 18px;
}
h1.title{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(38px,7vw,68px);
  line-height:.98;letter-spacing:-.01em;
  margin:0 0 20px;text-wrap:balance;
}
h1.title em{font-style:italic;color:var(--accent)}
.lede{
  font-size:clamp(17px,2.3vw,20px);
  color:var(--ink-dim);max-width:60ch;margin:0 0 22px;
}
.howto{
  display:flex;gap:12px;align-items:flex-start;
  font-size:14.5px;color:var(--ink-dim);
  background:var(--surface);border:1px solid var(--line);
  border-left:3px solid var(--accent);
  border-radius:8px;padding:14px 16px;max-width:62ch;
}
.howto b{color:var(--ink)}
.howto .term{margin:0 1px}

/* ---------- Section scaffold ---------- */
section.module{
  padding:44px 0;
  border-bottom:1px solid var(--line);
}
.sec-index{
  font-family:var(--mono);font-size:12px;letter-spacing:.18em;
  color:var(--ink-faint);text-transform:uppercase;
  display:flex;align-items:center;gap:10px;margin-bottom:12px;
}
.sec-index .dot{width:6px;height:6px;border-radius:50%;background:var(--accent)}
h2.sec-title{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(25px,3.6vw,34px);line-height:1.08;
  margin:0 0 12px;letter-spacing:-.01em;text-wrap:balance;
}
.sec-blurb{color:var(--ink-dim);max-width:62ch;margin:0 0 24px;font-size:16px}
.sec-blurb.tight{margin-bottom:18px}

/* ---------- Clickable math terms ---------- */
.term{
  font:inherit;color:var(--info);
  background:transparent;border:0;padding:0;cursor:pointer;
  border-bottom:1px dashed color-mix(in srgb,var(--info) 55%, transparent);
  line-height:1.2;
}
.term:hover{color:var(--accent);border-bottom-color:var(--accent)}
.term:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:3px}
.term.sym{font-family:var(--mono);font-weight:600}

/* ---------- Formula plate ---------- */
.fml{
  font-family:var(--mono);font-size:15.5px;
  background:var(--surface-2);border:1px solid var(--line);
  border-radius:8px;padding:12px 16px;margin:0 0 20px;
  overflow-x:auto;white-space:nowrap;
}
.fml .op{color:var(--ink-faint)}
.fml.center{text-align:center}

/* ---------- Interactive card ---------- */
.card{
  background:var(--surface);border:1px solid var(--line);
  border-radius:14px;padding:22px;box-shadow:var(--shadow);
}
.card + .card{margin-top:18px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:start}
@media(max-width:720px){.grid2{grid-template-columns:1fr}}

.controls{display:flex;flex-direction:column;gap:16px}
.ctrl label{
  display:flex;justify-content:space-between;align-items:baseline;
  font-size:13.5px;color:var(--ink-dim);margin-bottom:6px;gap:10px;
}
.ctrl label .val{
  font-family:var(--mono);font-size:15px;color:var(--ink);font-weight:600;
  font-variant-numeric:tabular-nums;
}
input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:5px;
  background:var(--line-strong);border-radius:5px;outline:none;margin:2px 0;
}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:18px;height:18px;border-radius:50%;
  background:var(--accent);border:2px solid var(--surface);cursor:pointer;
  box-shadow:0 1px 3px rgba(0,0,0,.3);
}
input[type=range]::-moz-range-thumb{
  width:18px;height:18px;border-radius:50%;background:var(--accent);
  border:2px solid var(--surface);cursor:pointer;
}
input[type=range]:focus-visible::-webkit-slider-thumb{outline:2px solid var(--info);outline-offset:2px}
input[type=number]{
  font-family:var(--mono);font-size:14px;font-variant-numeric:tabular-nums;
  background:var(--bg);color:var(--ink);border:1px solid var(--line-strong);
  border-radius:6px;padding:6px 8px;width:100%;
}
input[type=number]:focus-visible{outline:2px solid var(--info);outline-offset:1px;border-color:var(--info)}
select.rl-sel{
  font-family:var(--mono);font-size:13.5px;font-variant-numeric:tabular-nums;
  background:var(--bg);color:var(--ink);border:1px solid var(--line-strong);
  border-radius:6px;padding:8px 10px;width:100%;cursor:pointer;
}
select.rl-sel:focus-visible{outline:2px solid var(--info);outline-offset:1px;border-color:var(--info)}
input.rl-inp{
  font-family:var(--mono);font-size:13px;font-variant-numeric:tabular-nums;
  background:var(--bg);color:var(--ink);border:1px solid var(--line-strong);
  border-radius:6px;padding:8px 10px;width:100%;
}
input.rl-inp:focus-visible{outline:2px solid var(--info);outline-offset:1px;border-color:var(--info)}
.num-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.num-row .ctrl label{margin-bottom:4px}

/* ---------- Readouts ---------- */
.readout{display:flex;flex-direction:column;gap:2px}
.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.stat{
  background:var(--surface-2);border:1px solid var(--line);
  border-radius:10px;padding:12px 14px;
}
.stat .k{font-size:12px;color:var(--ink-dim);letter-spacing:.02em;margin-bottom:4px;display:flex;align-items:center;gap:6px}
.stat .v{
  font-family:var(--mono);font-size:23px;font-weight:600;line-height:1.05;
  font-variant-numeric:tabular-nums;letter-spacing:-.01em;
}
.stat .v.sm{font-size:18px}
.stat .sub{font-size:12px;color:var(--ink-faint);margin-top:3px;font-family:var(--mono)}
.v.pos{color:var(--long)} .v.neg{color:var(--short)} .v.hot{color:var(--accent)}

canvas{display:block;width:100%;height:auto;border-radius:10px}
.chart-wrap{background:var(--surface-2);border:1px solid var(--line);border-radius:10px;padding:12px}
.chart-cap{font-size:12px;color:var(--ink-faint);font-family:var(--mono);margin-top:8px;text-align:center}

.note{
  font-size:14px;color:var(--ink-dim);margin-top:16px;
  padding-left:14px;border-left:2px solid var(--line-strong);
}
.note.warn{border-left-color:var(--short)}
.note.key{border-left-color:var(--accent)}
.note b{color:var(--ink)}

/* ledger-style worked example table */
.ledger{width:100%;border-collapse:collapse;font-family:var(--mono);font-size:13.5px;font-variant-numeric:tabular-nums}
.ledger td,.ledger th{padding:7px 10px;text-align:right;border-bottom:1px solid var(--line)}
.ledger th{color:var(--ink-faint);font-weight:500;text-align:right;font-size:11.5px;letter-spacing:.05em;text-transform:uppercase}
.ledger td:first-child,.ledger th:first-child{text-align:left;color:var(--ink-dim)}
.ledger tr:last-child td{border-bottom:0}
.ledger .em td{color:var(--ink);font-weight:600;border-top:1.5px solid var(--line-strong)}

.seg{display:inline-flex;background:var(--surface-2);border:1px solid var(--line);border-radius:9px;padding:3px;gap:2px;flex-wrap:wrap}
.seg button{
  font-family:var(--mono);font-size:13px;color:var(--ink-dim);
  background:transparent;border:0;border-radius:6px;padding:6px 12px;cursor:pointer;
}
.seg button.on{background:var(--accent);color:#fff;font-weight:600}
:root[data-theme="dark"] .seg button.on,
:root:not([data-theme="light"]) .seg button.on{color:#12100a}
@media (prefers-color-scheme:light){:root:not([data-theme="dark"]) .seg button.on{color:#fff}}

.btn{
  font-family:-apple-system,sans-serif;font-size:14px;font-weight:600;
  background:var(--accent);color:#fff;border:0;border-radius:9px;
  padding:11px 18px;cursor:pointer;
}
:root[data-theme="dark"] .btn,:root:not([data-theme="light"]) .btn{color:#12100a}
@media (prefers-color-scheme:light){:root:not([data-theme="dark"]) .btn{color:#fff}}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line-strong)}
.btn:focus-visible{outline:2px solid var(--info);outline-offset:2px}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:6px}

/* ---------- Theme toggle ---------- */
.theme-btn{
  position:fixed;top:16px;right:16px;z-index:40;
  width:40px;height:40px;border-radius:50%;
  background:var(--surface);border:1px solid var(--line-strong);
  color:var(--ink);cursor:pointer;font-size:17px;line-height:1;
  box-shadow:var(--shadow);display:grid;place-items:center;
}
.theme-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ---------- Explanation drawer ---------- */
.scrim{
  position:fixed;inset:0;background:rgba(10,12,10,.42);
  opacity:0;pointer-events:none;transition:opacity .28s ease;z-index:50;
  backdrop-filter:blur(1.5px);
}
.scrim.open{opacity:1;pointer-events:auto}
.drawer{
  position:fixed;top:0;right:0;height:100%;width:min(480px,92vw);
  background:var(--surface);border-left:1px solid var(--line-strong);
  box-shadow:-14px 0 46px rgba(0,0,0,.28);
  transform:translateX(102%);transition:transform .32s cubic-bezier(.4,0,.15,1);
  z-index:51;display:flex;flex-direction:column;
}
.drawer.open{transform:translateX(0)}
.drawer-head{
  padding:20px 22px 16px;border-bottom:1px solid var(--line);
  display:flex;justify-content:space-between;align-items:flex-start;gap:14px;flex-shrink:0;
}
.drawer-eyebrow{font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin:0 0 6px}
.drawer-title{font-family:var(--serif);font-size:26px;font-weight:600;margin:0;line-height:1.05}
.drawer-title .sym{font-family:var(--mono);color:var(--ink-dim);font-size:18px;font-style:normal;margin-left:8px}
.drawer-close{
  background:var(--surface-2);border:1px solid var(--line);color:var(--ink);
  width:34px;height:34px;border-radius:8px;cursor:pointer;font-size:18px;flex-shrink:0;
}
.drawer-close:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.drawer-body{padding:20px 22px 60px;overflow-y:auto;font-size:15.5px;line-height:1.65}
.drawer-body h4{
  font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink-faint);margin:22px 0 8px;
}
.drawer-body h4:first-child{margin-top:0}
.drawer-body p{margin:0 0 12px;color:var(--ink-dim)}
.drawer-body p strong,.drawer-body li strong{color:var(--ink)}
.drawer-body .fml{white-space:normal;font-size:14.5px}
.drawer-body ul{margin:0 0 12px;padding-left:20px;color:var(--ink-dim)}
.drawer-body li{margin-bottom:6px}
.drawer-body .exbox{
  background:var(--surface-2);border:1px solid var(--line);border-radius:10px;
  padding:14px 16px;margin:4px 0 14px;font-size:14.5px;
}
.drawer-body .exbox .xh{font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:8px}
.drawer-body .exbox code{font-family:var(--mono);color:var(--ink)}
.drawer-body .related{margin-top:24px;padding-top:16px;border-top:1px solid var(--line)}
.drawer-body .related .rlab{font-size:12px;color:var(--ink-faint);margin-bottom:8px}
.chip{
  display:inline-block;font-family:var(--mono);font-size:12.5px;
  background:var(--surface-2);border:1px solid var(--line-strong);color:var(--info);
  border-radius:20px;padding:4px 12px;margin:0 6px 6px 0;cursor:pointer;
}
.chip:hover{border-color:var(--accent);color:var(--accent)}
.chip:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

footer{padding:40px 0 70px;color:var(--ink-faint);font-size:13.5px}
footer .fml{display:inline-block;margin:0}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* ---------- Export toolbar · chart PNG buttons · toast ---------- */
.toolbar{
  position:fixed;left:16px;bottom:16px;z-index:40;display:flex;gap:6px;align-items:center;
  background:var(--surface);border:1px solid var(--line-strong);border-radius:12px;
  padding:6px 8px;box-shadow:var(--shadow);
}
.toolbar .tlabel{font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint);padding:0 6px 0 4px}
.toolbar button{font-family:var(--mono);font-size:12.5px;color:var(--ink-dim);background:transparent;border:0;border-radius:7px;padding:6px 10px;cursor:pointer}
.toolbar button:hover{background:var(--surface-2);color:var(--ink)}
.toolbar button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.toolbar .tsep{width:1px;height:18px;background:var(--line)}
.chart-wrap{position:relative}
.png-btn{
  position:absolute;top:20px;right:20px;font-family:var(--mono);font-size:11px;color:var(--ink-dim);
  background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:3px 8px;cursor:pointer;opacity:.72;z-index:2;
}
.png-btn:hover{opacity:1;color:var(--ink);border-color:var(--line-strong)}
.png-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px;opacity:1}
.toast{
  position:fixed;left:50%;bottom:74px;transform:translateX(-50%) translateY(10px);z-index:60;
  background:var(--ink);color:var(--bg);font-family:var(--mono);font-size:12.5px;
  padding:9px 16px;border-radius:20px;opacity:0;pointer-events:none;
  transition:opacity .25s ease,transform .25s ease;box-shadow:var(--shadow);
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toolbar a{
  font-family:var(--mono);font-size:12.5px;color:var(--ink-dim);text-decoration:none;
  border-radius:7px;padding:6px 10px;display:inline-block;
}
.toolbar a:hover{background:var(--surface-2);color:var(--ink)}
.toolbar a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media (max-width:640px){ .toolbar{left:8px;right:8px;bottom:8px;justify-content:center} .toolbar .tlabel{display:none} }
@media print{ .toolbar,.png-btn,.theme-btn,.toast{display:none} }

/* ============================================================
   Multi-page shell: the course nav, and the teaching components
   the simulation pages share.
   ============================================================ */

/* ---------- Top page nav (rendered by Desk.initShell) ---------- */
.pagenav{border-bottom:1px solid var(--line);background:var(--surface)}
.pagenav .wrap{
  display:flex;align-items:center;gap:6px;flex-wrap:wrap;
  padding-top:9px;padding-bottom:9px;padding-right:64px;   /* clear the fixed theme button */
}
.pagenav .mark{
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--accent);margin-right:8px;white-space:nowrap;
}
.pagenav a{
  font-family:var(--mono);font-size:12.5px;color:var(--ink-dim);text-decoration:none;
  padding:5px 10px;border-radius:7px;border:1px solid transparent;white-space:nowrap;
}
.pagenav a:hover{background:var(--surface-2);color:var(--ink)}
.pagenav a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.pagenav a[aria-current="page"]{
  background:var(--surface-2);color:var(--ink);border-color:var(--line-strong);font-weight:600;
}
.pagenav a .n{color:var(--ink-faint);margin-right:6px}
.pagenav a[aria-current="page"] .n{color:var(--accent)}
.pagenav .spacer{flex:1}
.pagenav a.course{color:var(--accent);border-color:color-mix(in srgb,var(--accent) 40%,transparent)}
@media(max-width:860px){
  .pagenav .wrap{gap:4px;padding-right:56px}
  .pagenav a{font-size:11.5px;padding:4px 8px}
  .pagenav .mark{display:none}
  .pagenav .spacer{display:none}
}
/* On a phone the module numbers cost a whole extra row of wrapping. */
@media(max-width:560px){
  .pagenav .wrap{gap:3px;padding-left:12px;padding-right:52px}
  .pagenav a{font-size:11px;padding:4px 7px}
  .pagenav a .n{display:none}
  .pagenav a.course .n{display:inline;margin-right:4px}
}

/* ---------- Footer prev/next ---------- */
.nextup{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-top:26px;padding-top:22px;border-top:1px solid var(--line)}
.nextup a{
  display:block;text-decoration:none;color:var(--ink);
  background:var(--surface);border:1px solid var(--line);border-radius:11px;
  padding:13px 17px;min-width:210px;flex:1;
}
.nextup a:hover{border-color:var(--accent)}
.nextup a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.nextup .dir{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:4px}
.nextup .to{font-family:var(--serif);font-size:18px;font-weight:600}
.nextup a.fwd{text-align:right;border-left:3px solid var(--accent)}
.nextup a.back{border-right:3px solid var(--line-strong)}

/* ---------- "Try this" — the guided-path block on every module ---------- */
.tryit{
  background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--info);
  border-radius:10px;padding:15px 18px;margin-top:18px;
}
.tryit .th{
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--info);margin-bottom:10px;
}
.tryit .tr{display:flex;gap:12px;font-size:14.5px;color:var(--ink-dim);margin-bottom:7px;align-items:baseline}
.tryit .tr:last-child{margin-bottom:0}
.tryit .tk{
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink-faint);flex:0 0 52px;text-align:right;padding-top:2px;
}
.tryit b{color:var(--ink)}
@media(max-width:520px){
  .tryit .tr{flex-direction:column;gap:2px}
  .tryit .tk{text-align:left;flex:none}
}

/* ---------- Derivation steps: numbered algebra ---------- */
.derive{counter-reset:dstep;margin:0 0 6px}
.dstep{
  position:relative;padding:0 0 22px 46px;border-left:1px solid var(--line);
  margin-left:13px;
}
.dstep:last-child{border-left-color:transparent;padding-bottom:4px}
.dstep::before{
  counter-increment:dstep;content:counter(dstep);
  position:absolute;left:-13px;top:0;width:26px;height:26px;border-radius:50%;
  background:var(--surface-2);border:1px solid var(--line-strong);color:var(--accent);
  font-family:var(--mono);font-size:12px;font-weight:600;
  display:grid;place-items:center;
}
.dstep h4{
  font-family:var(--serif);font-size:19px;font-weight:600;margin:1px 0 8px;color:var(--ink);
}
.dstep p{margin:0 0 12px;color:var(--ink-dim);font-size:15.5px;max-width:60ch}
.dstep .fml{margin-bottom:12px}
.dstep p:last-child,.dstep .fml:last-child{margin-bottom:0}

/* ---------- Assumption ledger: model vs. reality ---------- */
.ledger td.ok{color:var(--long)}
.ledger td.bad{color:var(--short)}
.ledger.left td,.ledger.left th{text-align:left}
.ledger.left td:last-child,.ledger.left th:last-child{text-align:left}
.ledger .wrap-cell{white-space:normal;font-family:-apple-system,sans-serif;font-size:13.5px;line-height:1.5}

/* ---------- The course page ---------- */
.stage{margin-bottom:34px}
.stage-h{display:flex;align-items:baseline;gap:12px;margin-bottom:6px;flex-wrap:wrap}
.stage-h .sn{font-family:var(--mono);font-size:12px;letter-spacing:.16em;color:var(--accent);text-transform:uppercase}
.stage-h h3{font-family:var(--serif);font-size:24px;font-weight:600;margin:0}
.stage-blurb{color:var(--ink-dim);font-size:15px;margin:0 0 16px;max-width:62ch}
.step{
  display:flex;gap:14px;align-items:flex-start;
  background:var(--surface);border:1px solid var(--line);border-radius:11px;
  padding:14px 16px;margin-bottom:10px;
}
.step.done{border-color:color-mix(in srgb,var(--long) 45%,var(--line))}
.step input[type=checkbox]{
  appearance:none;-webkit-appearance:none;flex:0 0 auto;
  width:20px;height:20px;margin:2px 0 0;border-radius:6px;cursor:pointer;
  background:var(--bg);border:1.5px solid var(--line-strong);display:grid;place-items:center;
}
.step input[type=checkbox]:checked{background:var(--long);border-color:var(--long)}
.step input[type=checkbox]:checked::after{content:"✓";color:var(--surface);font-size:13px;font-weight:700;line-height:1}
.step input[type=checkbox]:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.step .sbody{flex:1;min-width:0}
.step .stitle{font-size:15.5px;font-weight:600;color:var(--ink);margin-bottom:3px}
.step .stitle a{color:inherit;text-decoration:none;border-bottom:1px solid var(--line-strong)}
.step .stitle a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.step .swhat{font-size:14px;color:var(--ink-dim)}
.step .smeta{font-family:var(--mono);font-size:11px;color:var(--ink-faint);margin-top:5px;letter-spacing:.04em}
.progress-wrap{background:var(--surface-2);border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin-bottom:8px}
.progress-bar{height:8px;border-radius:5px;background:var(--line);overflow:hidden;margin-top:9px}
.progress-bar i{display:block;height:100%;background:var(--accent);border-radius:5px;transition:width .3s ease}

/* ---------- Small shared bits ---------- */
.stat-grid.three{grid-template-columns:1fr 1fr 1fr}
.stat-grid.four{grid-template-columns:repeat(4,1fr)}
@media(max-width:520px){.stat-grid.three,.stat-grid.four{grid-template-columns:1fr 1fr}}
.pill{
  display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.06em;
  background:var(--surface-2);border:1px solid var(--line);border-radius:20px;
  padding:2px 10px;color:var(--ink-dim);
}
.pill.good{color:var(--long);border-color:color-mix(in srgb,var(--long) 40%,transparent)}
.pill.bad{color:var(--short);border-color:color-mix(in srgb,var(--short) 40%,transparent)}
.legend{display:flex;gap:16px;flex-wrap:wrap;font-family:var(--mono);font-size:11.5px;color:var(--ink-faint);margin-top:10px;justify-content:center}
.legend span{display:inline-flex;align-items:center;gap:6px}
.legend i{width:14px;height:3px;border-radius:2px;display:inline-block}

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