/* velvetbet.casino, design v6: calculation workbench.
   Phones: one column, the dark offer banner after the intro. From 1100px: three tracks, [c] side-heads and figures,
   [t] the text lane, [r] the sticky deal rail. Type and tracks are in rem; the root grows from 16px at 1440 to 20px at 2560.
   Palette: research/PALETTE.md tokens only; tints via color-mix. */

@font-face{font-family:"Readex Pro";src:url("assets/fonts/readex-pro-latin.woff2") format("woff2");font-weight:160 700;font-style:normal;font-display:swap;
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Readex Pro";src:url("assets/fonts/readex-pro-latin-ext.woff2") format("woff2");font-weight:160 700;font-style:normal;font-display:swap;
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Azeret Mono";src:url("assets/fonts/azeret-mono-latin.woff2") format("woff2");font-weight:100 900;font-style:normal;font-display:swap;
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Azeret Mono";src:url("assets/fonts/azeret-mono-latin-ext.woff2") format("woff2");font-weight:100 900;font-style:normal;font-display:swap;
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

:root{
  --vb-bg:#11110F;--vb-surface:#131313;--vb-surface-2:#181916;--vb-surface-3:#1E1D1D;--vb-text:#EAEAEA;
  --vb-text-body:rgba(255,255,255,.6);--vb-text-muted:#BCBCC0;--vb-brand:#95F400;--vb-on-brand:#11110F;
  --vb-border:#3C3C3D;--vb-accent:#FFDD2A;--vb-error:#FE0000;color-scheme:dark;

  --f-text:"Readex Pro",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --f-fig:"Azeret Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --hair:color-mix(in srgb,var(--vb-border) 62%,transparent);
  --lime-wash:color-mix(in srgb,var(--vb-brand) 10%,transparent);
  --sec-gap:28px;
  --ring:0 0 0 2px var(--vb-bg),0 0 0 4px var(--vb-text);
  /* wide tracks (from 1100px): the side-head / input column and the text lane (about 31em of body text); --wbox is the container */
  --wc:20rem;--wt:33rem;--wg:3rem;--wbox:calc(var(--wc) + var(--wg) + var(--wt));
}

*,*::before,*::after{box-sizing:border-box}
html{font-size:clamp(16px,0.4464vw + 9.57px,21px);background:var(--vb-bg);-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:16px;
  -webkit-tap-highlight-color:color-mix(in srgb,var(--vb-brand) 18%,transparent)}
a,button,label,input,summary{touch-action:manipulation}
body{margin:0;background:var(--vb-bg);color:var(--vb-text-muted);font:400 1rem/1.625 var(--f-text);font-synthesis:none;
  -webkit-font-smoothing:antialiased;overflow-wrap:break-word}
img{max-width:100%}
h1,h2,h3{color:var(--vb-text);text-wrap:balance;margin:0}
p,li,dd{text-wrap:pretty}
p{margin:0}
a{color:var(--vb-text);text-decoration:underline;text-decoration-color:color-mix(in srgb,var(--vb-text) 45%,transparent);
  text-decoration-thickness:1px;text-underline-offset:3px;transition:color 120ms}
a:hover{color:var(--vb-brand)}
q{quotes:"\201C" "\201D"}
:focus-visible{outline:2px solid transparent;box-shadow:var(--ring);border-radius:4px}
.ic{width:20px;height:20px;flex:none}

/* ---------- header: the floating island ---------- */
.top{max-width:calc(34rem + 32px);margin:0 auto;padding:8px 12px 0}
.island{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:48px;padding:2px 4px 2px 14px;
  background:var(--vb-surface-2);border:1px solid var(--hair);border-radius:10px}
.mark{display:inline-flex;align-items:center;min-height:44px;font-size:1.125rem;line-height:1;letter-spacing:-.015em;text-decoration:none;color:var(--vb-text)}
.mark-l{font-weight:700}
.mark-a{font-weight:300;color:var(--vb-brand)}
.mark:hover{color:var(--vb-text)}
.island-nav{display:flex;align-items:center}
.island-links{display:none;list-style:none;margin:0;padding:0}
.island-links a{display:inline-flex;white-space:nowrap;align-items:center;min-height:44px;padding:0 .75rem;border-radius:7px;font-size:.9375rem;line-height:1.3;
  color:var(--vb-text-muted);text-decoration:none;transition:color 120ms,background-color 120ms}
.island-links a:hover{color:var(--vb-text);background:var(--vb-surface-3)}
.island-links a[aria-current=page]{position:relative;color:var(--vb-text)}
.island-links a[aria-current=page]::after{content:"";position:absolute;left:.75rem;right:.75rem;bottom:8px;height:2px;border-radius:1px;background:var(--vb-brand)}
.pages-btn{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 10px 0 14px;border:1px solid var(--vb-border);border-radius:7px;
  background:var(--vb-surface-3);color:var(--vb-text);font:500 .9375rem/1 var(--f-text);cursor:pointer}
.pages-btn .ic{width:18px;height:18px;transition:transform 160ms}
.pages-btn:hover{filter:brightness(1.08)}
.pages{position:fixed;inset:60px 16px auto auto;margin:0;overscroll-behavior:contain;width:min(300px,calc(100vw - 32px));padding:6px;
  background:var(--vb-surface-2);color:var(--vb-text);border:1px solid var(--vb-border);border-radius:10px}
.pages::backdrop{background:rgb(0 0 0 / .45)}
.pages ul{list-style:none;margin:0;padding:0}
.pages a{display:flex;align-items:center;min-height:48px;padding:0 14px;border-radius:7px;text-decoration:none;font-size:1rem;color:var(--vb-text)}
.pages a:hover{background:var(--vb-surface-3);color:var(--vb-text)}
.pages a[aria-current=page]{box-shadow:inset 3px 0 0 var(--vb-brand)}
.top-tag{margin:4px 4px 0;font-size:.875rem;line-height:1.3;color:var(--vb-text-muted)}

/* ---------- main column ---------- */
main{display:grid;grid-template-columns:minmax(0,1fr);row-gap:var(--sec-gap);max-width:calc(34rem + 32px);margin:0 auto;padding:8px 16px 0}
main > *{min-width:0}

/* opening: H1 with the subject plate, lede, intro */
.opening,main > .hero{display:grid;grid-template-columns:minmax(0,1fr) auto;column-gap:12px;row-gap:6px;align-items:center}
.opening h1,main > .hero h1{grid-column:1;grid-row:1;font-size:clamp(2.125rem,9vw,2.5rem);line-height:1.1;font-weight:700;letter-spacing:-.02em}
.opening h1,.opening [data-plate]{align-self:last baseline}
main > .hero h1{grid-column:1 / -1;grid-row:2}
.plate,[data-plate]{display:inline-flex;align-items:center;justify-self:end;padding:7px 10px;background:var(--vb-bg);border:1px solid var(--vb-border);border-radius:8px}
.opening [data-plate]{grid-column:2;grid-row:1}
main > .hero .plate{grid-column:1 / -1;grid-row:1;justify-self:start}
.plate img,[data-plate] img{display:block;width:88px;height:auto}
.lede,.intro{grid-column:1 / -1}
.lede{font-size:.875rem;line-height:1.45;font-weight:500;color:var(--vb-brand)}
.intro{font-size:1rem;line-height:1.5;color:var(--vb-text-muted);font-variant-numeric:tabular-nums lining-nums}

/* ---------- the deal: a dark offer banner; lime only as type, a 3px spine, a 5px stripe tape under the figure and the button ---------- */
.banner{position:relative;margin:0;background:var(--vb-surface);border:1px solid var(--vb-border);border-radius:16px;overflow:hidden;color:var(--vb-text)}
.banner-head{display:flex;align-items:flex-start;flex-wrap:wrap;gap:6px 12px;padding:8px 16px 10px}
.banner-plate{display:inline-flex;padding:4px 8px;background:var(--vb-bg);border:1px solid var(--vb-border);border-radius:8px}
.banner-plate img{display:block;width:96px;height:auto}
.banner-k{flex:1 1 12em;font-size:.875rem;line-height:1.4;color:var(--vb-text-muted)}
.banner-field{position:relative;isolation:isolate;padding:18px 16px 20px 19px;border-block:1px solid var(--hair);background:var(--vb-surface-3);
  box-shadow:inset 3px 0 0 var(--vb-brand)}
.banner-field::after{content:"";position:absolute;left:19px;bottom:0;width:min(10rem,45%);height:5px;
  background:repeating-linear-gradient(118deg,var(--vb-brand) 0 2px,transparent 2px 8px)}
.banner-offer{font-weight:700;font-size:clamp(1.75rem,8vw,2.125rem);line-height:1.2;letter-spacing:-.025em;max-width:13em;text-wrap:balance}
.banner-offer span{color:var(--vb-brand)}
.banner-body{display:grid;gap:16px;padding:6px 16px 14px}
.termsheet{list-style:none;margin:0;padding:0}
.termsheet li{padding:10px 0 10px 20px;position:relative;font-size:1rem;line-height:1.5;color:var(--vb-text)}
.termsheet li + li{border-top:1px solid var(--hair)}
.termsheet li::before{content:"";position:absolute;left:0;top:1.25rem;width:10px;height:2px;background:var(--vb-text-muted)}
.banner-act{display:grid;gap:10px;align-content:start}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 18px;border-radius:7px;
  background:var(--vb-brand);color:var(--vb-on-brand);font:600 1rem/1.25 var(--f-text);text-decoration:none;transition:filter 120ms}
.btn:hover{color:var(--vb-on-brand);filter:brightness(1.08)}
.btn .ic{width:18px;height:18px}
.banner-fine{display:flex;align-items:center;gap:10px;font-size:.875rem;line-height:1.4;color:var(--vb-text-muted)}
.banner-aff{font-size:1rem;line-height:1.55;color:var(--vb-text-muted)}
.b18{display:inline-flex;align-items:center;justify-content:center;min-width:32px;height:32px;padding:0 4px;border:2px solid var(--vb-error);
  border-radius:50%;font:700 .875rem/1 var(--f-text);color:var(--vb-text);flex:none}

/* ---------- sections ---------- */
.sec,main > section{display:grid;grid-template-columns:minmax(0,1fr);row-gap:16px;align-content:start}
.sec > *,main > section > *{min-width:0}
main h2{font-size:1.5rem;line-height:1.25;font-weight:700;letter-spacing:-.012em}
main h3{font-size:1.1875rem;line-height:1.37;font-weight:600;color:var(--vb-brand)}
.notes{display:grid;row-gap:16px}
.v5-pending{padding:14px 16px;border:2px dashed var(--vb-border);border-radius:8px;font-size:.875rem;line-height:1.45;color:var(--vb-text-muted)}

/* the equation strip: the signature */
.equation{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:2px 14px;padding:11px 14px;
  background:var(--vb-surface-2);border:1px solid var(--hair);border-radius:8px;
  font:500 1rem/1.5 var(--f-fig);font-variant-numeric:tabular-nums;color:var(--vb-text);letter-spacing:-.03em;word-spacing:-.22em}
.equation b{font-weight:700;color:var(--vb-brand);white-space:nowrap;text-decoration:underline double;text-decoration-thickness:1px;text-underline-offset:5px}
.equation .eq-w{font-family:var(--f-text);font-weight:600;letter-spacing:0;word-spacing:0}
.equation.is-cap b{color:var(--vb-accent)}
.equation.is-key{justify-content:flex-start;font-size:clamp(1.1875rem,5.4vw,1.5rem);line-height:1.35;padding:14px 16px}
.eq-key{font-size:.875rem;line-height:1.4;color:var(--vb-text-muted)}
.margin-sum{display:grid;grid-template-columns:minmax(0,1fr);row-gap:12px}
.sum{display:grid;row-gap:8px}
.margin-sum > .sum .equation{font-size:1.125rem;line-height:1.45;padding:13px 16px}

/* steps: a worked example as a column of equation lines (a real sequence) */
.equation.steps{display:block;list-style:none;margin:0;padding:6px 14px;counter-reset:st}
.equation.steps li{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:2px 14px;padding:8px 0;counter-increment:st}
.equation.steps li + li{border-top:1px dashed var(--hair)}
.equation.steps li > span{font-family:var(--f-text);font-size:.9375rem;letter-spacing:0;word-spacing:0;color:var(--vb-text-muted)}
.equation.steps li > span::before{content:counter(st) ". ";font-family:var(--f-fig);color:var(--vb-text-muted)}
.equation.steps li b{font-weight:600;color:var(--vb-text);text-decoration:none}
.equation.steps li.total{border-top:2px solid var(--vb-brand)}
.equation.steps li.total b{color:var(--vb-brand);font-weight:700;text-decoration:underline double;text-decoration-thickness:1px;text-underline-offset:5px}
.equation.steps li.total > span{font-family:var(--f-fig);letter-spacing:-.03em;word-spacing:-.22em;color:var(--vb-text)}

/* worksheet tables */
.worksheet,.tbl{container-type:inline-size;overflow-x:auto;border:1px solid var(--vb-border);border-radius:10px;background-color:var(--vb-surface);
  background-image:linear-gradient(90deg,var(--vb-surface) 30%,transparent),linear-gradient(270deg,var(--vb-surface) 30%,transparent),radial-gradient(farthest-side at 0 50%,rgb(0 0 0 / .55),transparent),radial-gradient(farthest-side at 100% 50%,rgb(0 0 0 / .55),transparent);
  background-position:left,right,left,right;background-size:28px 100%,28px 100%,12px 100%,12px 100%;background-repeat:no-repeat;background-attachment:local,local,scroll,scroll}
.worksheet table,.tbl table{width:100%;border-collapse:collapse;font-size:.9375rem;line-height:1.47}
.worksheet caption,.tbl caption{position:sticky;left:0;max-width:100cqi;box-sizing:border-box;caption-side:top;text-align:left;padding:12px 14px;font-weight:600;color:var(--vb-text);border-bottom:1px solid var(--vb-border);text-wrap:balance}
.worksheet th,.worksheet td,.tbl th,.tbl td{padding:10px 12px;text-align:left;vertical-align:top;border-top:1px solid var(--hair)}
.worksheet th + td,.worksheet td + td,.worksheet th + th,.tbl th + td,.tbl td + td,.tbl th + th{border-left:1px solid var(--hair)}
.worksheet thead th,.tbl thead th{border-top:0;background:var(--vb-surface-3);font-size:.875rem;line-height:1.4;font-weight:500;color:var(--vb-text-muted)}
.worksheet tbody th,.tbl tbody th{font-weight:600;color:var(--vb-text)}
.worksheet td,.tbl td{color:var(--vb-text-muted)}
.worksheet .fig{font-family:var(--f-fig);font-weight:500;font-variant-numeric:tabular-nums;letter-spacing:-.03em;color:var(--vb-text);text-align:right}
.worksheet .formula th,.worksheet .formula td{background:color-mix(in srgb,var(--vb-text) 4%,transparent);font-family:var(--f-fig);font-size:.875rem}
.worksheet .total th,.worksheet .total td{border-top:2px solid var(--vb-brand);background:var(--vb-surface-3);color:var(--vb-text);font-weight:600}
.worksheet .total .fig{color:var(--vb-brand);font-weight:700;text-decoration:underline double;text-decoration-thickness:1px;text-underline-offset:5px}
.worksheet .cell-q{font-family:var(--f-text);font-weight:400;color:var(--vb-text-muted)}
.worksheet.pair thead th + th{color:var(--vb-text)}

/* timeline */
.deadline{list-style:none;margin:0;padding:0 0 0 18px;border-left:2px solid var(--vb-border)}
.deadline li{position:relative;padding:0 0 16px 6px}
.deadline li::before{content:"";position:absolute;left:-25px;top:8px;width:12px;height:12px;border-radius:50%;background:var(--vb-bg);border:2px solid var(--vb-brand)}
.deadline b{display:block;font:600 .9375rem/1.47 var(--f-text);color:var(--vb-text)}

/* checklists: the assumption-style list (RG close, footer ledger) */
.assumptions,main > section.rg:not(.sec) ul{list-style:none;margin:0;padding:0}
.assumptions li,main > section.rg:not(.sec) ul li{position:relative;padding:11px 0 11px 22px;border-top:1px solid var(--hair)}
.assumptions li:last-child,main > section.rg:not(.sec) ul li:last-child{border-bottom:1px solid var(--hair)}
.assumptions li::before,main > section.rg:not(.sec) ul li::before{content:"";position:absolute;left:0;top:1.5rem;width:12px;height:2px;background:var(--vb-text-muted)}
/* inner-page lists: a numbered calculation sequence and inline name chips */
main > section ol.steps:not(.equation){list-style:none;margin:0;padding:0;counter-reset:st}
main > section ol.steps:not(.equation) li{position:relative;padding:12px 0 12px 40px;border-top:1px solid var(--hair);counter-increment:st}
main > section ol.steps:not(.equation) li:last-child{border-bottom:1px solid var(--hair)}
main > section ol.steps:not(.equation) li::before{content:counter(st);position:absolute;left:0;top:12px;width:26px;height:26px;display:grid;place-items:center;
  border:1px solid var(--vb-border);border-radius:7px;font:500 .875rem/1 var(--f-fig);color:var(--vb-brand)}
main > section ol.steps:not(.equation) b{color:var(--vb-text)}
ul.coins{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
ul.coins li{padding:5px 10px;border:1px solid var(--vb-border);border-radius:7px;background:var(--vb-surface-2);font-size:.875rem;line-height:1.45;color:var(--vb-text)}
.age{display:flex;align-items:center;gap:10px;font-size:1rem;line-height:1.55;color:var(--vb-text)}
/* inner-page plain lists take the dash list */
main section:not(.sec) ul:not([class]){list-style:none;margin:0;padding:0}
main section:not(.sec) ul:not([class]) > li{position:relative;padding:11px 0 11px 22px;border-top:1px solid var(--hair)}
main section:not(.sec) ul:not([class]) > li:last-child{border-bottom:1px solid var(--hair)}
main section:not(.sec) ul:not([class]) > li::before{content:"";position:absolute;left:0;top:1.5rem;width:12px;height:2px;background:var(--vb-text-muted)}

/* ---------- the workbench ---------- */
.bench{display:grid;grid-template-columns:minmax(0,1fr);row-gap:20px}
.bench-notes{display:grid;row-gap:16px}
.tool{container-type:inline-size;background:var(--vb-surface-2);border:1px solid var(--hair);border-radius:16px;overflow:clip}
.tool-form{display:grid;gap:16px;padding:16px;align-content:start}
.seg{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;margin:0;padding:0;border:0;min-width:0}
.seg legend{padding:0;margin:0 0 8px;font-size:.875rem;line-height:1.45;color:var(--vb-text-muted)}
.seg label{position:relative;display:flex;align-items:center;justify-content:center;min-height:48px;padding:0 4px;
  background:var(--vb-surface-3);border:1px solid var(--vb-border);border-radius:7px;font:600 1rem/1 var(--f-text);color:var(--vb-text);
  cursor:pointer;transition:background-color 120ms,color 120ms}
.seg input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer}
.seg label:hover{filter:brightness(1.08)}
.seg label:has(input:checked){background:var(--vb-brand);border-color:var(--vb-brand);color:var(--vb-on-brand)}
.seg label:has(input:focus-visible){box-shadow:var(--ring)}
.seg input:focus-visible{box-shadow:none}
.amt{display:grid;gap:8px}
.amt > label{font-size:.875rem;line-height:1.45;color:var(--vb-text-muted)}
.amt-box{display:flex;align-items:center;gap:10px;min-height:56px;padding:0 14px;background:var(--vb-bg);border:1px solid var(--vb-border);border-radius:7px}
.amt-box span{font:500 1.0625rem/1 var(--f-fig);color:var(--vb-text-muted)}
.amt-box input{flex:1;align-self:stretch;min-height:44px;min-width:0;width:100%;padding:0;margin:0;background:transparent;border:0;color:var(--vb-text);
  font:500 1.5rem/1.2 var(--f-fig);font-variant-numeric:tabular-nums;text-align:right;outline:none}
.amt-box input:focus-visible{box-shadow:none}
.amt-box:has(input:focus-visible){box-shadow:var(--ring);border-color:var(--vb-text-muted)}
.amt-hint{font-size:.875rem;line-height:1.45;color:var(--vb-text-muted)}

/* the output (pinned script output: ids and classes kept) */
.out{border-top:1px solid var(--vb-border);background:var(--vb-surface)}
.tape{min-height:30rem;padding:14px 16px 16px}
.tool > .tape{border-top:1px solid var(--vb-border);background:var(--vb-surface)}
.tape.is-warn{box-shadow:inset 3px 0 0 var(--vb-error)}
.tape__title{margin:0 0 8px;font-size:.9375rem;line-height:1.47;font-weight:600;color:var(--vb-text)}
.tape .big{font-size:1.0625rem;line-height:1.55;color:var(--vb-text)}
.rows{margin:0;border-radius:8px}
.rows > div{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;column-gap:12px;row-gap:2px;padding:8px 0;border-top:1px solid var(--hair)}
.rows > div:first-child{border-top:0}
.rows dt{flex:1 1 9.5em;font-size:.875rem;line-height:1.45;color:var(--vb-text-muted)}
.rows dd{margin:0 0 0 auto;font:500 .9375rem/1.35 var(--f-fig);font-variant-numeric:tabular-nums;letter-spacing:-.03em;color:var(--vb-text);white-space:nowrap;text-align:right}
.rows > .rows__key{display:grid;row-gap:4px;margin:4px -8px;padding:12px 8px 12px 11px;border-top:0;border-radius:8px;background:var(--vb-surface-3);box-shadow:inset 3px 0 0 var(--vb-brand)}
.rows > .rows__key + div{border-top:0}
.rows__key dt{color:var(--vb-text);font-weight:600}
.rows__key dd{margin:0;text-align:left;white-space:normal;text-wrap:balance;font-size:clamp(1.375rem,9cqi,2rem);line-height:1.15;font-weight:700;color:var(--vb-brand)}
.rows__faint dt,.rows__faint dd{font-size:.875rem;color:var(--vb-text-muted)}
.rows > .rows__open{padding-left:10px;box-shadow:inset 2px 0 0 var(--vb-accent)}
.rows__open dd{font-family:var(--f-text);font-weight:500;white-space:normal}
.rows > div:last-child:not(.rows__open):not(.rows__key) dd{color:var(--vb-accent)}
.readings{margin-top:12px;padding:10px 12px;background:var(--vb-surface-3);border-left:2px solid var(--vb-accent);border-radius:0 8px 8px 0}
.readings__intro{font-size:1rem;line-height:1.55;color:var(--vb-text)}
.readings__list{margin:8px 0 0;padding-left:18px;font-size:1rem;line-height:1.55;color:var(--vb-text)}
.tape__note{margin-top:12px;font-size:1rem;line-height:1.55;color:var(--vb-text-muted)}
@keyframes recompute{from{background-color:color-mix(in srgb,var(--vb-brand) 16%,transparent)}to{background-color:transparent}}
.tool:focus-within .rows,.tool:focus-within .big{animation:recompute 160ms ease-out}

/* contents box: chips of the calculation steps */
.chips{display:flex;gap:8px;overflow-x:auto;scroll-snap-type:x proximity;padding-bottom:4px}
.chips p{flex:none;align-self:center;font-size:.875rem;color:var(--vb-text-muted);margin-right:4px}
.chips ul{display:flex;gap:8px;list-style:none;margin:0;padding:0}
.chips a{display:inline-flex;align-items:center;min-height:44px;padding:0 14px;border:1px solid var(--vb-border);border-radius:7px;
  background:var(--vb-surface-2);font-size:.9375rem;text-decoration:none;white-space:nowrap;scroll-snap-align:start}
.chips a:hover{color:var(--vb-text);border-color:var(--vb-brand)}

/* operator box: term-sheet rows */
.opbox{padding:18px 16px;border:1px solid var(--vb-border);border-radius:16px;display:grid;row-gap:12px}
.opbox-t{font-size:1.0625rem;line-height:1.4;font-weight:700;color:var(--vb-text)}
.opbox dl{margin:0}
.opbox dl > div{display:grid;grid-template-columns:minmax(0,1fr);row-gap:2px;padding:10px 0;border-top:1px solid var(--hair)}
.opbox dt{font-size:.875rem;line-height:1.4;color:var(--vb-text-muted)}
.opbox dd{margin:0;font-size:1rem;line-height:1.55;color:var(--vb-text)}
.opbox > p:last-child{font-size:1rem;line-height:1.55}

/* FAQ: full-width accordion rows; the question H3 sits on the marker's line */
.rows-acc details,main > section.faq:not(.sec) > details{border-top:1px solid var(--vb-border)}
.rows-acc details:last-child,main > section.faq:not(.sec) > details:last-of-type{border-bottom:1px solid var(--vb-border)}
.rows-acc summary,main > section.faq:not(.sec) summary{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:56px;padding:12px 0;
  list-style:none;cursor:pointer}
.rows-acc summary::-webkit-details-marker,main > section.faq:not(.sec) summary::-webkit-details-marker{display:none}
.rows-acc summary::after,main > section.faq:not(.sec) summary::after{content:"";flex:none;width:9px;height:9px;margin:0 6px 4px 0;
  border-right:2px solid var(--vb-text-muted);border-bottom:2px solid var(--vb-text-muted);transform:rotate(45deg);transition:transform 160ms}
.rows-acc details[open] > summary::after,main > section.faq:not(.sec) details[open] > summary::after{transform:rotate(225deg);margin-bottom:-4px}
summary h3{flex:1 1 auto;margin:0;padding:0;font-size:1.1875rem;line-height:1.37}
summary:hover h3{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px}
.ans{display:grid;row-gap:12px;padding:0 0 18px}
/* a closed row's answer takes no box at all (Chrome otherwise reports phantom rects below the section) */
details:not([open]) > :not(summary){display:none}
main > section.faq:not(.sec) > details > p,.rows-acc details > p{padding:0 0 18px}

/* byline */
.byline{display:flex;gap:12px;align-items:flex-start;padding:16px 0 0;border-top:1px solid var(--hair)}
.by-tx{display:grid;gap:2px;font-size:.875rem;line-height:1.5}
.by-n{font-weight:600;color:var(--vb-text)}
.by-n a{display:inline-block;padding-block:13px;margin-block:-13px}
.by-up{color:var(--vb-text-muted)}

/* ---------- footer: assumption ledger, links, RG ---------- */
.foot{margin-top:56px;background:var(--vb-surface);border-top:1px solid var(--vb-border);color:var(--vb-text-muted);font-size:.875rem;line-height:1.5}
.foot-in{display:grid;grid-template-columns:minmax(0,1fr);row-gap:28px;max-width:calc(34rem + 32px);margin:0 auto;
  padding:32px 16px calc(32px + env(safe-area-inset-bottom,0px))}
.ledger{display:grid;row-gap:10px}
.ledger-h{font-size:1.0625rem;line-height:1.4;font-weight:700;color:var(--vb-text)}
.ledger-list{list-style:none;margin:0;padding:0;display:grid}
.ledger-list li{position:relative;padding:9px 0 9px 22px;border-top:1px solid var(--hair);color:var(--vb-text-muted)}
.ledger-list li::before{content:"";position:absolute;left:0;top:1.2rem;width:12px;height:2px;background:var(--vb-text-muted)}
.foot-nav{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px 24px}
.foot-h{font-weight:600;color:var(--vb-text)}
.foot-col ul{list-style:none;margin:4px 0 0;padding:0}
.foot-col a,.foot-col span{display:inline-flex;align-items:center;min-height:44px}
.foot-col a{color:var(--vb-text-muted);text-decoration-color:var(--hair)}
.foot-col a:hover{color:var(--vb-brand)}
.foot-rg{display:flex;gap:12px;align-items:flex-start;padding:14px;border:1px solid var(--hair);border-radius:10px;color:var(--vb-text-muted)}
.foot-fine{font-size:.875rem;line-height:1.45}
.foot-indep{color:var(--vb-text)}
.foot-indep + .foot-fine{margin-top:-20px}

/* ---------- below 1100: the answer leads the tape; the banner runs edge to edge ---------- */
@media (max-width:1099px){
  .banner{margin-inline:-16px;border-radius:0;border-inline:0}
  main > :is(.opening,.hero) + .deal{margin-top:calc(16px - var(--sec-gap))}
  .rows{display:flex;flex-direction:column}
  .rows > .rows__key{order:-1;margin-top:0}
  .rows > .rows__key + div{border-top:1px solid var(--hair)}
}
@media (max-width:639px){
  .tbl th,.tbl td{padding:8px 9px}
  .tbl table{font-size:.875rem;line-height:1.43}
}
@media (min-width:640px){
  body{font-size:1.0625rem;line-height:1.65}
  .lede{font-size:1.125rem;line-height:1.5}
  .intro{font-size:1.0625rem;line-height:1.65}
  .opening h1{font-size:2.5rem;line-height:1.15}
  .banner-head{align-items:center;padding:12px 16px}
  .banner-plate{padding:6px 9px}
  .banner-field{padding:24px 16px 26px 19px}
  .banner-body{padding:8px 16px 18px}
  .plate img,[data-plate] img{width:112px}
  .banner-btn{justify-self:start}
}
@media (min-width:1024px){
  .opbox dd,.opbox > p:last-child,.banner-aff,.readings__intro,.readings__list,.tape__note,.age{font-size:1.0625rem;line-height:1.6}
  .termsheet li{font-size:1.0625rem;line-height:1.55}
}

/* ---------- wide: two tracks (side-head / input column | text lane), the full-width deal banner, workbench bands ---------- */
@media (min-width:1100px){
  .top{max-width:calc(var(--wbox) + 3rem);padding:1rem 1.5rem 0}
  .island-links{display:flex;gap:2px}
  .pages-btn,.pages{display:none}
  .island{min-height:3.75rem;padding:4px 6px 4px 1.25rem}
  .mark{font-size:1.25rem}
  .top-tag{margin:.75rem 0 0;font-size:.875rem}

  main{max-width:none;padding:2.5rem 0 0;row-gap:0;column-gap:0;
    grid-template-columns:[full-start] minmax(1.5rem,1fr) [c-start] minmax(14rem,var(--wc)) [c-end] var(--wg) [t-start] minmax(26rem,var(--wt)) [t-end] minmax(1.5rem,1fr) [full-end]}
  main > *{grid-column:c-start / t-end;margin-top:3rem}
  main > :first-child{margin-top:0}

  /* hero: plate and lede in the side-head track, H1 and intro in the lane, a rule beneath */
  main > :is(.opening,.hero){display:grid;grid-template-columns:subgrid;column-gap:0;row-gap:1.5rem;align-items:start;
    padding-bottom:2.5rem;border-bottom:1px solid var(--hair)}
  .opening h1,main > .hero h1{grid-column:t;grid-row:1;align-self:end;font-size:3.75rem;line-height:1.02;text-wrap:balance}
  main > .hero h1{font-size:2.625rem;line-height:1.12}
  :is(.opening,main > .hero) :is(.plate,[data-plate]){grid-column:c;grid-row:1;align-self:end;justify-self:start;padding:.55rem .8rem}
  .plate img,[data-plate] img{width:8rem}
  .lede{grid-column:c;grid-row:2;padding-right:.5rem;font-size:1.25rem;line-height:1.5}
  .intro{grid-column:t;grid-row:2;font-size:1.0625rem;line-height:1.65}

  /* the deal: one full-width banner after the opening. Head row; the offer on plain dark with the button and the ad mark beside it;
     the term sheet beneath in two columns at body size; the disclosure last, never smaller than the terms */
  main > .deal{margin-top:2.5rem}
  .banner{display:grid;grid-template-columns:minmax(0,1fr) auto;border-radius:1rem}
  .banner::before{content:"";grid-area:2 / 1 / 4 / -1;background:var(--vb-surface-3);border-block:1px solid var(--hair);box-shadow:inset 3px 0 0 var(--vb-brand)}
  .banner-head{grid-area:1 / 1 / 2 / -1;padding:1rem 1.75rem}
  .banner-plate{padding:.4rem .7rem}
  .banner-plate img{width:7.5rem}
  .banner-k{font-size:1rem;line-height:1.45}
  .banner-field{grid-area:2 / 1 / 4 / 2;display:flex;align-items:center;min-height:9rem;padding:1.75rem 2rem 2.125rem 2.125rem;
    background:none;border:0;box-shadow:none}
  .banner-field::after{left:2.125rem;bottom:.875rem;width:12rem}
  .banner-offer{max-width:15em;font-size:3.25rem;line-height:1.08;letter-spacing:-.03em}
  .banner-body,.banner-act{display:contents}
  .banner-btn{grid-area:2 / 2;align-self:end;justify-self:end;position:relative;z-index:1;margin:1.75rem 1.75rem .625rem 0;
    min-height:3.25rem;padding:0 1.5rem;font-size:1.0625rem}
  .banner-fine{grid-area:3 / 2;align-self:start;justify-self:end;position:relative;z-index:1;margin:0 1.75rem 1.75rem 0}
  .termsheet{grid-area:4 / 1 / 5 / -1;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:2.5rem;padding:.5rem 1.75rem 0}
  .termsheet li{padding-block:.75rem;border-top:1px solid var(--hair)}
  .termsheet li:nth-child(-n+2){border-top:0}
  .termsheet li::before{top:1.55rem}
  .banner-aff{grid-area:5 / 1 / 6 / -1;margin:0 1.75rem;padding:1rem 0 1.5rem;border-top:1px solid var(--hair)}

  main h2{font-size:1.625rem;line-height:1.25}
  main h3{font-size:1.25rem;line-height:1.4}

  /* lane sections: the H2 is a sticky side-head on a lime tab; everything else runs in the lane */
  main > :is(.sec,section){display:grid;grid-template-columns:subgrid;column-gap:0;row-gap:0;align-content:start}
  main > :is(.sec,section) > *{grid-column:t;margin-top:1.125rem}
  main > :is(.sec,section) > h2{grid-column:c;grid-row:1 / span 40;align-self:start;position:sticky;top:1.25rem;margin-top:0;
    padding:.875rem .75rem 0 0;border-top:2px solid var(--vb-brand)}
  main > :is(.sec,section) > h3{margin-top:2rem}
  main > :is(.sec,section) > h3 + *{margin-top:.625rem}
  main > :is(.sec,section) > h2 + *{margin-top:0}
  main > :is(.sec,section) > h2 + :is(p,h3,ul,ol){padding-top:.75rem}

  /* workbench bands: framed surface-2 panels across both tracks. Prose stays in the lane; the H2 (and an H3 with prose after it)
     sits in the input column beside its first paragraph; the paired worksheets and the cap sums span both tracks. */
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair){
    grid-template-columns:[c-start] minmax(0,var(--wc)) [c-end] var(--wg) [t-start] minmax(0,1fr) [t-end];row-gap:0;
    padding:2.25rem 2rem 2.5rem;background:var(--vb-surface-2);border:1px solid var(--hair);border-radius:1rem}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) > h2{grid-column:c-start / t-end;grid-row:auto;position:static;padding:0;border-top:0;font-size:1.875rem;line-height:1.2}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) > h2 + *{margin-top:1.25rem}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) > h2 + :is(p,h3,ul,ol){padding-top:0}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) > h2:has(+ p){grid-column:c;grid-row:1 / span 3;align-self:start;padding:.875rem .75rem 0 0;border-top:2px solid var(--vb-brand);
    font-size:1.625rem;line-height:1.25}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) > h2:has(+ p) + p{margin-top:0;padding-top:.75rem}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) > h3{margin-top:2rem}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) > h3:has(+ p){grid-column:c;grid-row:span 2;align-self:start;padding-right:.75rem}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) > h3:has(+ p) + p{margin-top:2rem}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) > :is(.margin-sum,.worksheet){grid-column:c-start / t-end}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) > .equation.steps{grid-column:t}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) .worksheet{background-color:var(--vb-surface)}
  :is(.sec,main > section) > .margin-sum{grid-template-columns:subgrid;column-gap:0;row-gap:1rem;align-items:start}
  main > :is(.sec,section):not(:has([data-tool],.steps,.is-cap,.worksheet.pair)) > .margin-sum{grid-template-columns:minmax(0,1fr)}
  :is(.sec,main > section) > .margin-sum > *{grid-column:t}
  main > :is(.sec,section):has([data-tool],.steps,.is-cap,.worksheet.pair) > .margin-sum > .sum{grid-column:c;grid-row:1}
  main > :is(.sec,section):not(:has([data-tool],.steps,.is-cap,.worksheet.pair)) > .margin-sum > *{grid-column:1}

  /* the calculator band: the workbench split. The inputs open the input column; the result tape beneath them stays in view
     (sticky) down the whole section while the explanation of every line of the result runs beside it in the lane.
     :has(> .bench[data-tool]) outranks the shared band rules above. */
  main > :is(.sec,section):has(> .bench[data-tool]) > h2:has(+ p){grid-row:1}
  main > :is(.sec,section):has(> .bench[data-tool]) > .bench{display:contents}
  main > :is(.sec,section):has(> .bench[data-tool]) > .bench > .bench-lead,
  main > :is(.sec,section):has(> .bench[data-tool]) > .bench > .bench-notes > *{grid-column:t;margin-top:1.125rem}
  main > :is(.sec,section):has(> .bench[data-tool]) > .bench > .bench-notes{display:contents}
  main > :is(.sec,section):has(> .bench[data-tool]) > .bench > .tool{grid-column:c;grid-row:2 / span 40;align-self:stretch;margin-top:1.125rem;
    display:flex;flex-direction:column;row-gap:1rem;background:none;border:0;border-radius:0;overflow:visible}
  main > :is(.sec,section):has(> .bench[data-tool]) > .bench > .tool + .bench-notes > :first-child{margin-top:1.5rem}
  main > :is(.sec,section):has(> .bench[data-tool]) > :is(.margin-sum,.worksheet){grid-column:t}
  main > :is(.sec,section):has(> .bench[data-tool]) > .margin-sum{grid-template-columns:minmax(0,1fr)}
  main > :is(.sec,section):has(> .bench[data-tool]) > .margin-sum > :is(.notes,.sum){grid-column:1;grid-row:auto}
  main > :is(.sec,section):has(> .bench[data-tool]) .tool .tool-form{padding:1.25rem 1.25rem 1.375rem;background:var(--vb-surface-2);
    border:1px solid var(--hair);border-radius:1rem}
  main > :is(.sec,section):has(> .bench[data-tool]) .tool .out{position:sticky;top:1rem;border:1px solid var(--vb-border);border-radius:1rem;overflow:clip}
  main > :is(.sec,section):has(> .bench[data-tool]) .tool .rows{display:flex;flex-direction:column}
  main > :is(.sec,section):has(> .bench[data-tool]) .tool .rows > .rows__key{order:-1;margin-top:0}
  main > :is(.sec,section):has(> .bench[data-tool]) .tool .rows > .rows__key + div{border-top:1px solid var(--hair)}
  main > :is(.sec,section):has(> .bench[data-tool]) .tool .tape{min-height:0;padding:1rem 1.25rem 1.25rem}

  /* the calculator page: inputs | tape across both tracks; the inputs stay in view while the tape runs */
  main > .tool{display:grid;grid-template-columns:minmax(0,var(--wc)) minmax(0,1fr);align-items:stretch}
  main > .tool .tool-form{padding:1.5rem 1.25rem;position:sticky;top:1rem;align-self:start}
  main > .tool > :is(.out,.tape){border-top:0;border-left:1px solid var(--vb-border)}
  main > .tool .tape{padding:1.25rem 1.5rem 1.5rem}

  /* contents chips: a 3 x 2 grid of step tiles */
  main > .chips{display:grid;row-gap:.75rem;overflow:visible;padding:0}
  .chips ul{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.5rem}
  .chips a{display:flex;white-space:normal;min-height:3.25rem;padding:.5rem 1rem;line-height:1.35}

  .opbox{padding:1.5rem 1.75rem}
  .opbox dl > div{grid-template-columns:calc(var(--wc) - 1.75rem - 1px) minmax(0,1fr);column-gap:var(--wg)}
  .opbox > p:last-child{margin-left:calc(var(--wc) - 1.75rem - 1px + var(--wg))}
  .opbox-t{font-size:1.1875rem}
  .byline{padding-top:1.25rem}

  /* footer: the assumption ledger on the same two tracks */
  .foot{margin-top:4.5rem}
  .foot-in{max-width:calc(var(--wbox) + 3rem);padding-inline:1.5rem;row-gap:2rem;column-gap:0;
    grid-template-columns:[c-start] minmax(0,var(--wc)) [c-end] var(--wg) [t-start] minmax(0,1fr) [t-end]}
  .foot-in > *{grid-column:t}
  .ledger{grid-column:c-start / t-end;grid-template-columns:subgrid;column-gap:0}
  .ledger-h{grid-column:c;font-size:1.1875rem}
  .ledger-list{grid-column:t;grid-template-columns:1fr 1fr;column-gap:2.5rem}
  .foot-nav{grid-column:c-start / t-end;grid-template-columns:minmax(0,var(--wc)) var(--wg) minmax(0,1fr) 2.5rem minmax(0,1fr);column-gap:0}
  .foot-col:nth-child(3n+1){grid-column:1}
  .foot-col:nth-child(3n+2){grid-column:3}
  .foot-col:nth-child(3n){grid-column:5}
}

/* ---------- 1800 and wider: a wider container and larger running text keep each margin near a fifth of the screen ---------- */
@media (min-width:1800px){
  :root{--wc:min(25rem,23vw);--wt:35rem;--wg:4rem}
  body{font-size:1.125rem;line-height:1.65}
  .intro{font-size:1.125rem}
  .banner-offer{font-size:3.5rem}
}
/* ---------- 2200 and wider (polish round 2): the root keeps growing with the screen, continuous with the clamp above at 2200
   (19.4px) and reaching 22px at 2560, so the whole two-track box scales as one piece. The lane stays 35rem of 1.125rem text,
   so the measure stays at about 74 characters; the side-head column and the gutter take the extra width. ---------- */
@media (min-width:2200px){
  html{font-size:clamp(16px,0.725vw + 3.44px,22px)}
  :root{--wc:min(26rem,22.5vw);--wg:4.5rem}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}
@media (forced-colors:active){
  :focus-visible{outline:2px solid CanvasText}
}