/*
Theme Name: Quadratic Formula
Theme URI: https://quadraticformula.info/
Description: A graph-paper notebook theme for a maths formula site: squared paper, navy ink, a red margin rule and highlighter yellow, Libre Baskerville headings, Fira Sans text and Fira Code numbers, index-card formula boxes, worked example sheets, KaTeX maths, printable formula sheets and calculators with step-by-step working.
Version: 1.0.0
Requires at least: 6.0
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: quadraticformula
*/

/* Fonts: Libre Baskerville, Fira Sans, Fira Code and Sarala (SIL OFL), served locally. */
@font-face{font-family:"Libre Baskerville";src:url(assets/fonts/libre-baskerville-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Libre Baskerville";src:url(assets/fonts/libre-baskerville-latin-700-normal.woff2) format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"Libre Baskerville";src:url(assets/fonts/libre-baskerville-latin-400-italic.woff2) format("woff2");font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"Fira Sans";src:url(assets/fonts/fira-sans-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Fira Sans";src:url(assets/fonts/fira-sans-latin-400-italic.woff2) format("woff2");font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"Fira Sans";src:url(assets/fonts/fira-sans-latin-500-normal.woff2) format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"Fira Sans";src:url(assets/fonts/fira-sans-latin-700-normal.woff2) format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"Fira Code";src:url(assets/fonts/fira-code-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Fira Code";src:url(assets/fonts/fira-code-latin-600-normal.woff2) format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Sarala";src:url(assets/fonts/sarala-devanagari-400-normal.woff2) format("woff2");font-weight:400;font-display:swap;unicode-range:U+0900-097F,U+1CD0-1CF9,U+200C-200D,U+20A8,U+20B9,U+25CC,U+A830-A839,U+A8E0-A8FF}
@font-face{font-family:"Sarala";src:url(assets/fonts/sarala-devanagari-700-normal.woff2) format("woff2");font-weight:700;font-display:swap;unicode-range:U+0900-097F,U+1CD0-1CF9,U+200C-200D,U+20A8,U+20B9,U+25CC,U+A830-A839,U+A8E0-A8FF}

:root{
	--paper:#fbfaf6;--card:#ffffff;--grid:rgba(29,52,97,.075);--grid2:rgba(29,52,97,.14);
	--ink:#16223d;--ink2:#3c4862;--mute:#737d93;--line:#e2e1d8;--line2:#cfd3dd;
	--navy:#1d3461;--navy2:#132447;--red:#d64545;--hi:#ffe46b;--hi2:#fff4b8;--green:#2a7f62;--st:#1d3461;
	--serif:"Libre Baskerville",Georgia,"Times New Roman",serif;
	--sans:"Fira Sans","Sarala",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
	--mono:"Fira Code",ui-monospace,Menlo,Consolas,monospace;
	--sq:linear-gradient(var(--grid) 1px,transparent 1px) 0 0/24px 24px,linear-gradient(90deg,var(--grid) 1px,transparent 1px) 0 0/24px 24px;
	--sq2:linear-gradient(var(--grid2) 1px,transparent 1px) 0 0/120px 120px,linear-gradient(90deg,var(--grid2) 1px,transparent 1px) 0 0/120px 120px;
	--shadow:0 1px 0 rgba(22,34,61,.06),0 14px 30px -22px rgba(22,34,61,.5);
	--r:6px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px;overflow-x:clip}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17.5px/1.72 var(--sans);overflow-x:clip}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy);text-decoration-color:var(--red);text-decoration-thickness:1.5px;text-underline-offset:3px}
a:hover{color:var(--red)}
h1,h2,h3{font-family:var(--serif);font-weight:700;color:var(--ink);letter-spacing:-.2px}
[lang="hi"]{font-family:"Sarala",var(--sans)}
.qx-wrap{max-width:1180px;margin:0 auto;padding:0 18px}
.qx-skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:#fff;padding:8px 14px;z-index:99}
.qx-skip:focus{left:8px}

/* -------------------------------------------------------------------- top */
.qx-top{position:sticky;top:0;z-index:40;background:rgba(251,250,246,.97);backdrop-filter:blur(6px);border-bottom:1px solid var(--line2)}
.qx-top::after{content:"";display:block;height:3px;background:linear-gradient(var(--red),var(--red)) 0 0/100% 1px no-repeat,linear-gradient(var(--red),var(--red)) 0 2px/100% 1px no-repeat;opacity:.75}
.qx-top-row{display:flex;align-items:center;gap:16px;min-height:66px}
.qx-logo{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;flex:none}
.qx-logo span{font:400 21px/1 var(--serif);letter-spacing:-.3px}
.qx-logo b{font-weight:700;color:var(--navy)}
.qx-nav{display:flex;gap:2px;margin-left:auto}
.qx-nav a{color:var(--ink2);text-decoration:none;font:500 15px/1 var(--sans);padding:10px 12px;border-radius:4px;position:relative}
.qx-nav a:hover{color:var(--navy);background:linear-gradient(transparent 58%,var(--hi) 58%,var(--hi) 88%,transparent 88%)}
.qx-menubtn{display:flex;align-items:center;gap:9px;white-space:nowrap;flex:none;border:1.5px solid var(--navy);background:var(--navy);color:#fff;font:500 14.5px/1 var(--sans);border-radius:4px;padding:10px 15px;cursor:pointer}
.qx-menubtn:hover{background:var(--navy2)}
.qx-menubtn-bars{width:15px;height:2px;background:currentColor;position:relative;display:inline-block}
.qx-menubtn-bars::before,.qx-menubtn-bars::after{content:"";position:absolute;left:0;right:0;height:2px;background:currentColor}
.qx-menubtn-bars::before{top:-5px}.qx-menubtn-bars::after{top:5px}
.qx-drawer{background:var(--card);border-bottom:1px solid var(--line2);background-image:var(--sq)}
.qx-drawer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;padding:22px 18px 26px}
.qx-drawer-col{background:var(--card);border:1px solid var(--line2);border-top:4px solid var(--st);padding:12px 12px 8px}
.qx-drawer-h{margin:0 0 6px;font:700 15px/1.3 var(--serif);color:var(--st)}
.qx-drawer-col ul{list-style:none;margin:0;padding:0}
.qx-drawer-col a{display:block;color:var(--ink2);text-decoration:none;padding:5px 6px;font-size:15.5px}
.qx-drawer-col a:hover{color:var(--navy);background:var(--hi2)}

/* ------------------------------------------------------------------- hero */
.qx-hero{position:relative;padding:44px 0 36px;background:var(--sq2),var(--sq),var(--paper);border-bottom:1px solid var(--line2)}
.qx-hero::before{content:"";position:absolute;top:0;bottom:0;left:max(18px,calc(50% - 600px));width:2px;background:rgba(214,69,69,.45)}
.qx-hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(320px,.95fr);gap:44px;align-items:center;padding-left:34px}
.qx-eyebrow{display:inline-block;margin:0 0 14px;font:italic 400 17px/1.3 var(--serif);color:var(--red)}
.qx-hero h1{margin:0 0 14px;font-size:clamp(34px,4.8vw,58px);line-height:1.08;letter-spacing:-.8px}
.qx-hero-lede{margin:0 0 22px;font-size:18.5px;color:var(--ink2);max-width:54ch}
.qx-hero-acts{display:flex;flex-wrap:wrap;gap:10px}
.qx-btn{display:inline-flex;align-items:center;gap:8px;border:1.5px solid var(--navy);background:var(--card);color:var(--navy);font:500 15.5px/1 var(--sans);border-radius:4px;padding:12px 18px;text-decoration:none;cursor:pointer;box-shadow:3px 3px 0 var(--grid2)}
.qx-btn:hover{background:var(--hi2);color:var(--navy2)}
.qx-btn--main{background:var(--navy);color:#fff;box-shadow:3px 3px 0 var(--red)}
.qx-btn--main:hover{background:var(--navy2);color:#fff}
.qx-hero-card{position:relative;background:var(--card);border:1px solid var(--line2);padding:26px 26px 30px;transform:rotate(-1.2deg);box-shadow:0 22px 40px -26px rgba(22,34,61,.55);background-image:linear-gradient(transparent 31px,rgba(29,52,97,.09) 32px);background-size:100% 32px}
.qx-hero-card::before{content:"";position:absolute;left:44px;top:0;bottom:0;width:1.5px;background:rgba(214,69,69,.5)}
.qx-hero-card::after{content:"";position:absolute;right:26px;top:-12px;width:86px;height:26px;background:rgba(255,228,107,.85);transform:rotate(4deg)}
.qx-hero-card-h{margin:0 0 8px 34px;font:italic 400 15px/1.4 var(--serif);color:var(--mute)}
.qx-hero-card .katex-display{margin:14px 0 18px;font-size:1.55em;overflow:visible}
.qx-hero-note{margin:0;font:500 14px/1.4 var(--sans);color:var(--ink2);padding-left:34px}
.qx-hero-note b{font-family:var(--mono);font-weight:600;color:var(--red);background:var(--hi2);padding:1px 5px}
.qx-hero-note--a{margin-top:4px;color:var(--mute)}

/* ------------------------------------------------------------------ tiles */
.qx-stream{padding:34px 0 6px}
.qx-row-h{display:flex;align-items:center;gap:12px;margin:0 0 18px;font-size:clamp(24px,2.8vw,32px)}
.qx-row-h::after{content:"";flex:1;height:1px;background:var(--line2)}
.qx-row-h::before{content:"";width:12px;height:12px;background:var(--st);transform:rotate(45deg)}
.qx-tiles{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}
.qx-tile a{display:flex;flex-direction:column;height:100%;text-decoration:none;color:var(--ink);background:var(--card);border:1px solid var(--line2);box-shadow:var(--shadow);transition:transform .15s ease,box-shadow .15s ease}
.qx-tile a:hover{transform:translate(-2px,-2px);box-shadow:5px 5px 0 var(--st)}
.qx-tile-img{position:relative;display:block;aspect-ratio:4/3;overflow:hidden;background:var(--paper);border-bottom:1px solid var(--line2)}
.qx-tile-img img{width:100%;height:100%;object-fit:cover}
.qx-tile-badge{position:absolute;right:10px;top:10px;font:600 12px/1 var(--mono);color:var(--ink);background:var(--hi);padding:6px 8px;border:1px solid rgba(0,0,0,.12)}
.qx-tile-body{display:flex;flex-direction:column;gap:5px;padding:13px 14px 15px;border-top:3px solid var(--st)}
.qx-tile-name{font:700 18px/1.25 var(--serif)}
.qx-tile-meta{font:400 13px/1.3 var(--mono);color:var(--mute)}

/* ------------------------------------------------------------ page header */
.qx-pagehead{position:relative;padding:30px 0 20px;background:var(--sq),var(--paper);border-bottom:1px solid var(--line2)}
.qx-trail{display:flex;flex-wrap:wrap;gap:8px;font:500 13.5px/1.3 var(--sans);color:var(--mute);margin:0 0 12px}
.qx-trail a{color:var(--mute);text-decoration:none}
.qx-trail a:hover{color:var(--red)}
.qx-pagehead h1{margin:0 0 14px;font-size:clamp(29px,4.2vw,46px);line-height:1.12;max-width:26ch}
.qx-pagehead-meta{display:flex;flex-wrap:wrap;gap:8px;margin:0}
.qx-pagehead-meta span{font:400 13px/1 var(--mono);color:var(--ink2);background:var(--card);border:1px solid var(--line2);padding:7px 10px}
.qx-pagehead-meta span:first-child{background:var(--hi);border-color:#e9cf4c;color:var(--ink)}

/* ---------------------------------------------------------------- reading */
.qx-read{display:grid;grid-template-columns:minmax(0,1fr);gap:28px;padding:26px 18px 36px;max-width:900px}
.qx-read--narrow{max-width:780px}
.qx-read--home{padding-top:30px}
.qx-article{min-width:0}
.qx-article p,.qx-article li{color:var(--ink2)}
.qx-article strong{color:var(--ink)}
.qx-intro p{font-size:18.5px;margin:0 0 14px}
.qx-intro p:first-child{font:400 19.5px/1.7 var(--serif);color:var(--ink)}
.qx-hero-img{margin:22px 0;border:1px solid var(--line2);box-shadow:var(--shadow);background:var(--card);padding:8px}
.qx-hero-img img{width:100%}
.qx-math{overflow-x:auto;overflow-y:hidden;margin:14px 0;padding:2px 0}
.katex{font-size:1.1em}
.katex-display{margin:.6em 0;overflow-x:auto;overflow-y:hidden;padding:4px 2px}
.qx-part .katex-display,.qx-faq .katex-display{background:linear-gradient(90deg,var(--hi2),rgba(255,244,184,0) 80%);border-left:3px solid var(--hi);padding:10px 12px}

/* key formulas: index cards */
.qx-key{margin:26px 0;background:var(--card);border:1px solid var(--line2);box-shadow:var(--shadow);position:relative;padding:18px 18px 12px 58px;background-image:linear-gradient(transparent 29px,rgba(29,52,97,.06) 30px);background-size:100% 30px}
.qx-key::before{content:"";position:absolute;left:38px;top:0;bottom:0;width:2px;background:rgba(214,69,69,.55)}
.qx-key-h{margin:0 0 10px;font:700 21px/1.2 var(--serif);color:var(--navy)}
.qx-key-h::after{content:"";display:inline-block;width:46px;height:9px;margin-left:10px;background:var(--hi);vertical-align:middle}
.qx-key ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:10px 16px}
.qx-key li{margin:0;padding:10px 0 8px;border-bottom:1px dashed var(--line2);min-width:0}
.qx-key-name{margin:0;font:500 13.5px/1.3 var(--sans);color:var(--red);text-transform:uppercase;letter-spacing:.4px}
.qx-key-math .katex-display{margin:4px 0;text-align:left;font-size:1.02em}
.qx-key-math .katex-display>.katex{text-align:left}
.qx-key-val{margin:4px 0;color:var(--ink);font-size:16.5px}
.qx-key-val p{margin:0;color:var(--ink)}
.qx-key-note{margin:2px 0 0;font-size:13.5px !important;line-height:1.45;color:var(--mute) !important}

/* table of contents */
.qx-toc{margin:28px 0;padding:16px 20px;background:var(--card);border:1px solid var(--line2);border-left:4px solid var(--navy)}
.qx-toc p{margin:0 0 8px;font:700 16px/1 var(--serif);color:var(--navy)}
.qx-toc ol{margin:0;padding-left:24px;columns:2;column-gap:28px}
.qx-toc li{margin:0 0 6px;break-inside:avoid;font-size:15.5px}
.qx-toc li::marker{font:600 13px var(--mono);color:var(--red)}
.qx-toc a{color:var(--ink2);text-decoration:none}
.qx-toc a:hover,.qx-toc a[aria-current]{color:var(--navy);background:linear-gradient(transparent 60%,var(--hi) 60%)}

/* sections */
.qx-part{padding:2px 0 6px}
.qx-part h2{margin:38px 0 12px;font-size:clamp(25px,3vw,32px);line-height:1.2;padding-bottom:10px;border-bottom:1px solid var(--line2);position:relative}
.qx-part h2::after{content:"";position:absolute;left:0;bottom:-2px;width:72px;height:3px;background:var(--red)}
.qx-part h3{margin:22px 0 8px;font-size:21px;color:var(--navy)}
.qx-part ol,.qx-part ul{padding-left:24px}
.qx-part li{margin:0 0 8px}
.qx-part ul>li::marker{color:var(--red)}
.qx-part ol>li::marker{font:600 14px var(--mono);color:var(--navy)}
.qx-example{position:relative;margin:22px 0;padding:18px 20px 8px;background:var(--card);border:1px solid var(--line2);box-shadow:var(--shadow);background-image:var(--sq)}
.qx-example::before{content:"Worked example";position:absolute;top:-11px;left:16px;font:600 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.6px;background:var(--navy);color:#fff;padding:5px 9px}
.qx-example h3{margin:6px 0 10px;font-size:19px;color:var(--ink)}
.qx-example p:last-child strong:first-child{background:var(--hi);color:var(--ink);padding:1px 6px}
.qx-note{margin:20px 0;padding:14px 18px;background:var(--hi2);border-left:4px solid var(--hi);position:relative}
.qx-note::before{content:"Note";display:block;font:italic 700 15px/1.2 var(--serif);color:var(--red);margin-bottom:4px}
.qx-note p:last-child,.qx-example p:last-child{margin-bottom:10px}
.qx-note h3{margin-top:4px;font-size:18px}
.qx-table{overflow-x:auto;margin:18px 0;background:var(--card);border:1px solid var(--line2)}
.qx-table table{border-collapse:collapse;width:100%;font-size:15.5px}
.qx-table caption{caption-side:top;text-align:left;font:italic 400 15px var(--serif);padding:10px 14px;color:var(--mute)}
.qx-table th{background:var(--navy);color:#fff;text-align:left;font:500 14px/1.3 var(--sans);padding:11px 14px;white-space:nowrap}
.qx-table td{padding:10px 14px;border-top:1px solid var(--line);color:var(--ink2);vertical-align:top}
.qx-table tbody tr:nth-child(even) td{background:#fbfbf8}
.qx-table td .katex{font-size:1em}

/* downloads */
.qx-downloads{margin:36px 0 10px}
.qx-downloads h2{font-size:clamp(25px,3vw,32px);margin:0 0 14px}
.qx-dl-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.qx-dl a{display:flex;flex-direction:column;gap:6px;height:100%;padding:12px 12px 14px;background:var(--card);border:1px solid var(--line2);text-decoration:none;color:var(--ink);box-shadow:var(--shadow)}
.qx-dl a:hover{box-shadow:5px 5px 0 var(--navy)}
.qx-dl-img{display:block;aspect-ratio:600/424;overflow:hidden;border:1px solid var(--line);background:var(--paper)}
.qx-dl-img img{width:100%;height:100%;object-fit:cover;object-position:top}
.qx-dl-t{font:700 17px/1.3 var(--serif)}
.qx-dl-d{font-size:14.5px;color:var(--ink2);line-height:1.5}
.qx-dl-m{font:400 12.5px/1.3 var(--mono);color:var(--mute)}
.qx-dl .qx-btn{align-self:flex-start;margin-top:auto;padding:9px 14px;font-size:14px}

/* faq */
.qx-faq{margin:36px 0 8px}
.qx-faq h2{font-size:clamp(25px,3vw,32px);margin:0 0 14px}
.qx-faq details{background:var(--card);border:1px solid var(--line2);margin:0 0 -1px}
.qx-faq details[open]{border-left:4px solid var(--red)}
.qx-faq summary{cursor:pointer;padding:15px 52px 15px 18px;font:500 16.5px/1.45 var(--sans);color:var(--ink);list-style:none;position:relative}
.qx-faq summary::-webkit-details-marker{display:none}
.qx-faq summary::after{content:"+";position:absolute;right:16px;top:12px;width:26px;height:26px;border:1.5px solid var(--navy);color:var(--navy);font:600 18px/23px var(--mono);text-align:center}
.qx-faq details[open] summary::after{content:"−";background:var(--navy);color:#fff}
.qx-faq-a{padding:0 18px 12px}
.qx-faq-a p{margin:0 0 8px}

/* related */
.qx-related{border-top:1px solid var(--line2);padding-top:6px}
.qx-related h2{font-size:26px;margin:16px 0 14px}
.qx-related ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.qx-related a{display:flex;flex-direction:column;height:100%;text-decoration:none;background:var(--card);border:1px solid var(--line2)}
.qx-related a:hover{box-shadow:4px 4px 0 var(--navy)}
.qx-related img{aspect-ratio:4/3;object-fit:cover;width:100%;border-bottom:1px solid var(--line2)}
.qx-related b{font:700 16.5px/1.25 var(--serif);color:var(--ink);padding:10px 12px 2px}
.qx-related span{font:400 12.5px/1.3 var(--mono);color:var(--mute);padding:0 12px 12px}
.qx-ad{margin:22px 0;text-align:center}

/* --------------------------------------------------------------- calculators */
.qx-tool{margin:26px 0}
.qx-calc{position:relative;background:var(--card);border:1.5px solid var(--navy);box-shadow:6px 6px 0 var(--grid2);padding:20px 20px 18px}
.qx-calc::before{content:"";position:absolute;inset:0 0 auto 0;height:6px;background:repeating-linear-gradient(90deg,var(--navy) 0 12px,transparent 12px 18px)}
.qx-calc-h{margin:6px 0 2px;font:700 22px/1.25 var(--serif);color:var(--ink)}
.qx-calc-sub{margin:0 0 14px;font-size:14.5px;color:var(--mute)}
.qx-fields{display:grid;gap:12px;margin:0 0 12px}
.qx-fields--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.qx-fields--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.qx-fields--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.qx-field{display:flex;flex-direction:column;gap:5px;min-width:0}
.qx-field span{font:500 13.5px/1.2 var(--sans);color:var(--ink2)}
.qx-field input,.qx-field select,.qx-field textarea{width:100%;font:500 17px/1.3 var(--mono);color:var(--ink);background:var(--paper);border:1.5px solid var(--line2);border-radius:3px;padding:10px 11px;min-width:0}
.qx-field textarea{font-size:15.5px;resize:vertical}
.qx-field select{font-family:var(--sans);font-size:15.5px}
.qx-field input:focus,.qx-field select:focus,.qx-field textarea:focus{outline:none;border-color:var(--navy);box-shadow:0 0 0 3px var(--hi)}
.qx-field--wide{margin-bottom:12px}
.qx-seg{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 14px}
.qx-seg button{border:1.5px solid var(--line2);background:var(--paper);color:var(--ink2);font:500 14px/1 var(--sans);padding:9px 12px;border-radius:3px;cursor:pointer}
.qx-seg button[aria-pressed="true"]{background:var(--navy);border-color:var(--navy);color:#fff}
.qx-out{border-top:1px dashed var(--line2);padding-top:14px}
.qx-eq{margin:0 0 6px;font:600 20px/1.3 var(--mono);color:var(--ink)}
.qx-nature{margin:0 0 12px;color:var(--green) !important;font-weight:500}
.qx-res-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin:0 0 12px}
.qx-res-row--6{grid-template-columns:repeat(auto-fit,minmax(110px,1fr))}
.qx-res{display:flex;flex-direction:column;gap:4px;padding:12px 14px;background:var(--hi2);border:1px solid #efdc85;min-width:0}
.qx-res span{font:500 12.5px/1.2 var(--sans);color:var(--ink2);text-transform:uppercase;letter-spacing:.4px}
.qx-res b{font:600 21px/1.25 var(--mono);color:var(--ink);overflow-wrap:anywhere}
.qx-res small{font-size:13px;color:var(--mute)}
.qx-steps{margin:8px 0 12px;padding-left:24px;font-size:15.5px}
.qx-steps li{margin:0 0 7px;color:var(--ink2)}
.qx-steps li::marker{font:600 13px var(--mono);color:var(--red)}
.qx-steps b{font-family:var(--mono);color:var(--ink)}
.qx-err{margin:0;padding:10px 14px;background:#fdecec;border-left:4px solid var(--red);color:#8f2424 !important}
.qx-fr{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;font-size:.92em;line-height:1.15;margin:0 2px}
.qx-fr>span:first-child{border-bottom:1.5px solid currentColor;padding:0 3px}
.qx-fr>span:last-child{padding:0 3px}
.qx-rt{white-space:nowrap}
.qx-rt>span{border-top:1.5px solid currentColor;padding:0 2px;margin-left:1px}
.qx-graph{width:100%;height:auto;margin:6px 0 0;background:var(--paper);border:1px solid var(--line2)}
.qx-graph .g{stroke:var(--grid2);stroke-width:1}
.qx-graph .ax{stroke:var(--ink2);stroke-width:1.5}
.qx-graph .axis{stroke:var(--red);stroke-width:1.2;stroke-dasharray:5 5}
.qx-graph .curve{fill:none;stroke:var(--navy);stroke-width:3}
.qx-graph .root{fill:var(--hi);stroke:var(--ink);stroke-width:1.5}
.qx-graph .vtx{fill:var(--red)}
.qx-graph text{font:500 13px var(--mono);fill:var(--ink)}

/* -------------------------------------------------------------- blog bits */
.qx-latest{padding:12px 18px 34px}
.qx-latest h2{font-size:28px}
.qx-latest ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.qx-latest a{display:flex;justify-content:space-between;gap:14px;padding:13px 16px;background:var(--card);border:1px solid var(--line2);text-decoration:none;color:var(--ink)}
.qx-latest small{font-family:var(--mono);color:var(--mute);flex:none}
.qx-latest-more{display:inline-block;margin-top:12px;font-weight:500}
.qx-list-title{padding:30px 0 8px}
.qx-list-title h1{margin:0;font-size:clamp(30px,3.8vw,42px)}
.qx-postlist{display:grid;gap:12px;padding:6px 0 26px}
.qx-postrow{padding:16px 18px;background:var(--card);border:1px solid var(--line2)}
.qx-postrow h2{margin:0 0 4px;font-size:21px}
.qx-postrow h2 a{color:var(--ink);text-decoration:none}
.qx-date{color:var(--mute);font:400 13px var(--mono);margin:0 0 6px}
.qx-pager{display:flex;gap:8px;justify-content:center;padding:6px 0 30px}
.qx-pager a,.qx-pager span{padding:9px 14px;background:var(--card);border:1px solid var(--line2);text-decoration:none}
.qx-article--post p{color:var(--ink2)}

/* ---------------------------------------------------------------- footer */
.qx-foot{margin-top:34px;background:var(--navy2);color:#c9d3e6;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:24px 24px}
.qx-foot::before{content:"";display:block;height:4px;background:var(--red)}
.qx-foot-grid{display:grid;grid-template-columns:minmax(0,1.4fr) repeat(auto-fit,minmax(170px,1fr));gap:26px;padding:36px 18px 22px}
.qx-foot-brand p{margin:0 0 10px;font-size:14.5px;color:#a9b6cf;max-width:46ch}
.qx-logo--foot span{font:400 22px/1 var(--serif);color:#fff}
.qx-logo--foot b{color:var(--hi)}
.qx-foot-legal-note{font-size:13px !important;color:#8796b3 !important}
.qx-foot a{color:#e7ecf6}
.qx-foot-h{margin:0 0 8px;font:700 15px/1.2 var(--serif);color:var(--hi)}
.qx-foot-col ul{list-style:none;margin:0;padding:0}
.qx-foot-col a{display:block;padding:3px 0;font-size:14.5px;text-decoration:none}
.qx-foot-col a:hover{color:#fff;text-decoration:underline}
.qx-foot-legal{display:flex;flex-wrap:wrap;gap:8px 18px;padding:14px 18px 22px;border-top:1px solid rgba(255,255,255,.12);font-size:13px;color:#8796b3}
.qx-foot-legal a{color:#8796b3;text-decoration:none}
.qx-toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--navy);color:#fff;padding:11px 18px;font-weight:500;z-index:95}

/* ------------------------------------------------------------- print */
@media print{
	.qx-top,.qx-foot,.qx-toc,.qx-tool,.qx-related,.qx-ad,.qx-downloads,.qx-hero-img{display:none !important}
	body{background:#fff;font-size:12pt}
	.qx-faq details{border:0}.qx-faq details>*{display:block}
}

/* ------------------------------------------------------------ responsive */
@media (max-width:960px){.qx-hero-grid{grid-template-columns:1fr;padding-left:22px}.qx-nav{display:none}.qx-menubtn{margin-left:auto}.qx-hero-card{transform:none}}
@media (max-width:640px){
	body{font-size:16.5px}
	.qx-hero{padding:30px 0 26px}
	.qx-hero::before{left:10px}
	.qx-hero-grid{padding-left:34px;gap:26px}
	.qx-hero-card{padding:20px 14px 22px}
	.qx-hero-card::before{left:24px}
	.qx-hero-card-h,.qx-hero-note{margin-left:0;padding-left:20px}
	.qx-hero-card .katex-display{font-size:1.15em}
	.qx-toc ol{columns:1}
	.qx-foot-grid{grid-template-columns:1fr}
	.qx-logo span{font-size:18px}
	.qx-logo img{width:30px;height:30px}
	.qx-tiles{grid-template-columns:1fr 1fr;gap:12px}
	.qx-tile-name{font-size:15.5px}
	.qx-tile-body{padding:10px 10px 12px}
	.qx-key{padding:16px 12px 10px 30px}
	.qx-key::before{left:16px}
	.qx-key-math .katex-display{font-size:.9em}
	.qx-key ul{grid-template-columns:1fr}
	.qx-fields--3,.qx-fields--4{grid-template-columns:repeat(2,minmax(0,1fr))}
	.qx-calc{padding:18px 14px 14px;box-shadow:4px 4px 0 var(--grid2)}
	.qx-res b{font-size:18px}
	.qx-example{padding:18px 14px 6px}
}
@media (max-width:380px){.qx-fields--2,.qx-fields--3,.qx-fields--4{grid-template-columns:1fr}.qx-tiles{grid-template-columns:1fr}}