/* ==========================================================================
   Tetracta — shared design system (v5, 9 Nov 2026)
   Petrol + paper + ink. Newsreader for headings 28px and up, IBM Plex Sans for everything else.
   Chosen in two blind rounds (9 visitor profiles + 3 expert referees each).
   ========================================================================== */
/* Self-hosted fonts (SIL Open Font License 1.1, see /assets/fonts/OFL-*.txt). No requests to third parties. */
@font-face{font-family:"Newsreader";font-style:normal;font-weight:400;font-display:swap;src:url(/assets/fonts/newsreader-latin-ext.woff2) format("woff2");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-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:400 600;font-display:swap;src:url(/assets/fonts/plex-sans-latin-ext.woff2) format("woff2");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-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF}
@font-face{font-family:"Newsreader";font-style:normal;font-weight:400;font-display:swap;src:url(/assets/fonts/newsreader-latin.woff2) format("woff2");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:"IBM Plex Sans";font-style:normal;font-weight:400 600;font-display:swap;src:url(/assets/fonts/plex-sans-latin.woff2) format("woff2");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}
:root{
  /* brand surfaces: two shades of petrol, the dark end of the logo's own cyan */
  --cobalt:#0c4250;
  --cobalt-deep:#082f3a;
  /* one accent for links and key figures */
  --cobalt-ink:#005a70;
  --accent:#005a70;
  --paper:#f7f9fa;
  --mist:#e8eff1;
  --line:#cddbdf;
  --ink:#0e1c1f;
  --ink-2:#34474d;
  --on-blue:#ffffff;
  --on-blue-2:#cfe0e5;
  --signal:#46e0ff; /* logo cyan: focus rings and live dots on dark only */
  --ok:#0b6b52; --warn:#7a4d00; --bad:#a3262b;
  --display:"Newsreader",Georgia,"Times New Roman",serif;
  --text:"IBM Plex Sans","Helvetica Neue",Arial,sans-serif;
  --w:1200px;
  --g:clamp(16px,4vw,48px);
  --r:6px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.6 var(--text);font-variant-numeric:proportional-nums lining-nums;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg,video{max-width:100%}
a{color:var(--cobalt-ink);text-underline-offset:.2em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
.nb{white-space:nowrap}
h1,h2,h3{text-wrap:balance}
p{text-wrap:pretty}
.wrap{max-width:var(--w);margin:0 auto;padding:0 var(--g)}
.skip{position:absolute;left:-999px}.skip:focus{left:16px;top:12px;background:#fff;color:var(--ink);padding:8px 12px;z-index:20}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
.blue :focus-visible,.deep :focus-visible{outline-color:var(--signal)}

/* ---------- surfaces ---------- */
.blue{background:var(--cobalt);color:var(--on-blue)}
.deep{background:var(--cobalt-deep);color:var(--on-blue)}
.blue a,.deep a{color:var(--on-blue)}
.mist{background:var(--mist)}

/* ---------- header ---------- */
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:76px;gap:24px}
.brand{display:block;line-height:0}
.brand img{display:block;height:40px;width:auto}
.menu{display:flex;align-items:center;gap:32px;list-style:none;margin:0;padding:0;font-size:15px;font-weight:500}
.menu a{text-decoration:none}
.menu a:hover,.menu a[aria-current]{text-decoration:underline;text-decoration-thickness:2px}
.menu .menu-cta{border:1.5px solid currentColor;border-radius:var(--r);padding:8px 16px}
.menu .menu-cta:hover{background:#fff;color:var(--cobalt-ink);text-decoration:none}
#navToggle{display:none;background:transparent;border:1.5px solid rgba(255,255,255,.6);color:#fff;font:500 15px var(--text);padding:8px 16px;border-radius:var(--r);cursor:pointer}

/* ---------- buttons ---------- */
.btn{display:inline-block;font:600 16px/1 var(--text);padding:16px 24px;border-radius:var(--r);text-decoration:none;border:0;cursor:pointer;white-space:nowrap}
.btn-light{background:#fff;color:var(--cobalt-ink)}
.btn-light:hover{background:var(--ink);color:#fff;text-decoration:none}
.btn-blue{background:var(--cobalt);color:#fff}
.btn-line{background:transparent;color:#fff;box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.75)}
.btn-line:hover{background:#fff;color:var(--cobalt-ink);text-decoration:none}
.btn-blue:hover{background:var(--ink);text-decoration:none}
.blue .btn-light,.deep .btn-light{color:var(--cobalt-ink)}
.blue .btn-light:hover,.deep .btn-light:hover{color:#fff}
.more{font-weight:600}

/* ---------- type scale ---------- */
.h-xl{font:400 clamp(40px,6.2vw,84px)/1.04 var(--display);font-optical-sizing:auto;letter-spacing:-.012em;margin:0}
h2,.h2{font:400 clamp(32px,4.2vw,54px)/1.08 var(--display);font-optical-sizing:auto;letter-spacing:-.008em;margin:0 0 18px}
h3,.h3{font:500 clamp(20px,1.9vw,24px)/1.25 var(--text);letter-spacing:-.005em;margin:0 0 12px}
h4{font:600 18px/1.35 var(--text);margin:28px 0 8px}
.lede{font-size:clamp(18px,1.6vw,21px);color:var(--ink-2);max-width:60ch;margin:0}
.blue .lede,.deep .lede{color:var(--on-blue-2)}
.small{font-size:15px;color:var(--ink-2)}
.blue .small,.deep .small{color:var(--on-blue-2)}

/* ---------- sections ---------- */
.sec{padding:clamp(64px,9vw,120px) 0}
.sec-tight{padding:clamp(48px,6vw,80px) 0}
.sec-head{display:grid;grid-template-columns:minmax(0,1fr);gap:14px;align-items:start;margin-bottom:clamp(32px,4vw,56px)}
.sec-head h2{max-width:22ch;margin:0}
.sec-head .lede{max-width:62ch}
.sec-head .lede{justify-self:start}

/* ---------- offers (home) ---------- */
.offer{display:grid;grid-template-columns:5fr 7fr;gap:20px 64px;padding:clamp(32px,4vw,48px) 0;border-top:1px solid var(--line)}
.offer>header{position:sticky;top:24px;align-self:start}
.offer h3{margin:0 0 10px}
.offer .for{color:var(--ink-2);font-size:17px;margin:0;max-width:32ch}
.offer p{margin:0 0 14px;max-width:62ch}
.proof{border-top:1px solid var(--line);padding:14px 0 0;margin:14px 0 0}
.proof strong{font-weight:600}

/* ---------- facts strip (page heads) ---------- */
.facts-strip{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:0;margin:40px 0 0;border-top:1px solid rgba(255,255,255,.3)}
.facts-strip div{padding:16px 20px 4px 0}
.facts-strip dt{font-size:15px;color:var(--on-blue-2);margin:0 0 4px}
.facts-strip dd{margin:0;font-weight:600;font-size:17px}

/* ---------- page head (sub-pages) ---------- */
.page-head{padding:clamp(28px,4vw,56px) 0 clamp(36px,5vw,56px)}
.crumb{font-size:15px;margin:0 0 18px;color:var(--on-blue-2)}
.crumb a{color:var(--on-blue-2)}
.page-head h1{font:400 clamp(38px,5.4vw,70px)/1.05 var(--display);font-optical-sizing:auto;letter-spacing:-.012em;margin:0 0 20px;max-width:18ch}
.page-head .lede{max-width:62ch}

/* ---------- article body (sub-pages) ---------- */
.doc{display:grid;grid-template-columns:220px minmax(0,1fr);gap:56px;padding:clamp(48px,7vw,96px) var(--g)}
.toc{position:sticky;top:24px;align-self:start;font-size:15px}
.toc ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--line)}
.toc li a{display:block;padding:6px 0 6px 16px;color:var(--ink-2);text-decoration:none}
.toc li a:hover{color:var(--ink);text-decoration:underline}
.body{max-width:76ch}
.body section{padding-bottom:16px;margin-bottom:40px;border-bottom:1px solid var(--line)}
.body section:last-child{border-bottom:0}
.body h2{font-size:clamp(30px,3vw,40px);margin-top:0}
.body p,.body ul,.body ol{margin:0 0 16px}
.body li{margin:0 0 6px}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;margin:8px 0 24px}
table{border-collapse:collapse;width:100%;font-size:15px;line-height:1.45;font-variant-numeric:tabular-nums lining-nums}
caption{text-align:left;font-size:15px;color:var(--ink-2);padding:0 0 10px}
th,td{text-align:left;padding:11px 14px 11px 0;border-bottom:1px solid var(--line);vertical-align:top}
th{font-weight:600;border-bottom:2px solid var(--ink)}
td.num,th.num{text-align:right}

/* ---------- status tags ---------- */
.tag{display:inline-block;font:600 14px/1 var(--text);padding:4px 8px;border:1px solid currentColor;border-radius:3px;background:transparent;vertical-align:middle;white-space:nowrap}
.tag-current{color:var(--accent)}
.tag-prov{color:var(--ink-2);border-style:dashed}
.tag-withdrawn{color:var(--ink-2);text-decoration:line-through}
.tag-preview{color:var(--accent);border-style:dashed}

/* ---------- figures ---------- */
figure{margin:24px 0}
figure img{display:block;width:100%;height:auto;border-radius:var(--r);background:var(--mist)}
figcaption{font-size:15px;color:var(--ink-2);margin-top:10px}

/* ---------- callouts ---------- */
.note{background:var(--mist);border-radius:var(--r);padding:18px 22px;margin:20px 0}
.cta-box{background:var(--cobalt);color:#fff;border-radius:var(--r);padding:clamp(28px,4vw,44px);display:grid;grid-template-columns:1fr auto;gap:20px 40px;align-items:center;margin:16px 0 0}
.cta-box h2{font-size:clamp(28px,3vw,36px);margin:0 0 8px}
.cta-box p{margin:0;color:var(--on-blue-2)}

/* ---------- lists of items (index pages) ---------- */
.rows{border-top:2px solid var(--ink)}
.row-item{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,6fr) 170px;gap:12px 40px;padding:24px 0;border-bottom:1px solid var(--line);align-items:start}
.row-item h3{font-size:21px;margin:0}
.row-item p{margin:0;color:var(--ink-2)}
.row-item > a{justify-self:end;text-align:right}

/* ---------- forms ---------- */
form label{display:block;font-size:15px;font-weight:500;margin:0 0 8px}
input,select,textarea{width:100%;font:inherit;font-size:17px;color:var(--ink);background:#fff;border:1.5px solid transparent;border-radius:var(--r);padding:14px 16px}
input:focus,select:focus,textarea:focus{border-color:var(--ink)}
textarea{min-height:140px;resize:vertical}
.row{margin:0 0 18px}.split{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.consent{display:flex;gap:12px;align-items:flex-start;font-size:15px}
.consent input{width:20px;height:20px;margin-top:2px;flex:none}
.consent label{font-weight:400;margin:0}
.hp{position:absolute;left:-9999px}
#lf-note{min-height:1.4em;margin:14px 0 0}

/* ---------- footer ---------- */
footer.site{background:var(--cobalt-deep);color:var(--on-blue-2);font-size:15px;padding:48px 0 56px}
footer.site .wrap{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:28px 40px}
footer.site h4{color:#fff;margin:0 0 10px;font-size:15px}
footer.site ul{list-style:none;margin:0;padding:0}
footer.site li{margin:0 0 6px}
footer.site a{color:var(--on-blue);text-decoration:none}
footer.site a:hover{text-decoration:underline}
footer.site .brand img{height:34px;margin-bottom:14px}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .sec-head,.offer,.cta-box{grid-template-columns:1fr}
  .doc{grid-template-columns:minmax(0,1fr)}
  .offer>header,.toc{position:static}
  .toc{display:block;position:static}
  .toc ol{display:flex;flex-wrap:wrap;gap:2px 18px;border:0;border-block:1px solid var(--line);padding:10px 0}
  .toc li a{padding:6px 0}
  .row-item{grid-template-columns:1fr}
  .row-item > a{justify-self:start;text-align:left}
  footer.site .wrap{grid-template-columns:1fr 1fr}
  #navToggle{display:block}
  .top{position:relative}
  .menu{display:none;position:absolute;z-index:10;top:76px;left:0;right:0;flex-direction:column;align-items:flex-start;gap:0;background:var(--cobalt);padding:8px var(--g) 22px;border-bottom:1px solid rgba(255,255,255,.3)}
  .menu.open{display:flex}
  .menu a{display:block;padding:12px 0;font-size:19px;color:#fff}
  .menu .menu-cta{border:0;padding:12px 0}
}
@media (max-width:560px){
  body{font-size:17px}
  .split{grid-template-columns:1fr}
  footer.site .wrap{grid-template-columns:1fr}
  .btn{white-space:normal}
}

.bib{white-space:pre-wrap;font:inherit;font-size:15px;overflow-x:auto}
.body section h2:not(:first-child),.body section h3{margin-top:40px}
.body section h3{font-size:clamp(19px,1.5vw,21px)}

.menu .menu-live{font-weight:500}
.menu .menu-live.is-live{font-weight:600}
.is-live::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--signal);margin-right:8px;vertical-align:1px}
.mist .is-live::before,.sec .is-live::before{background:var(--ok)}
.blue .is-live::before,.deep .is-live::before{background:var(--signal)}

pre.code{margin:0;overflow-x:auto;font:inherit;font-size:15px;line-height:1.5;white-space:pre}

/* ---- review round 1 fixes ---- */
footer.site :focus-visible,.cta-box :focus-visible{outline-color:var(--signal)}
td.num,th.num{font-variant-numeric:tabular-nums lining-nums;white-space:nowrap}
caption{font-variant-numeric:proportional-nums lining-nums}
td.num.dp1{padding-right:calc(14px + 1ch)}
td.num.dp1:last-child{padding-right:1ch}
th:last-child,td:last-child{padding-right:0}
.table-wrap caption{position:sticky;left:0;max-width:calc(100vw - 2*var(--g))}
.table-wrap:focus-visible{outline-offset:2px}
@media (max-width:720px){
  th,td{padding-right:10px}
  .table-wrap :is(td,th):first-child{position:sticky;left:0;z-index:1;background:var(--paper)}
  .table-wrap{background:linear-gradient(270deg,var(--paper) 30%,transparent) right/40px 100% no-repeat local,linear-gradient(270deg,rgba(14,28,31,.18),transparent) right/14px 100% no-repeat scroll}
}
.doc.wide{grid-template-columns:minmax(0,1fr)}
.doc.wide .toc{display:none}
.doc.wide .body{max-width:none}
.doc.wide .body>section>:not(.table-wrap){max-width:76ch}
.tag-neutral{color:var(--ink-2)}
footer.site .foot-h{font:600 15px/1.35 var(--text);letter-spacing:0;color:#fff;margin:0 0 10px}
.consent input{width:24px;height:24px}
.acts{display:flex;flex-wrap:wrap;gap:6px 24px}
@media (max-width:960px){ #navToggle{margin-left:auto} .top nav{flex:0 0 0} }
.head-acts{display:flex;flex-wrap:wrap;align-items:center;gap:12px 24px;margin:28px 0 0}

/* ---- v5 identity (9 Nov 2026): referee fixes from round 2 ---- */
a{color:var(--accent)}
.blue a,.deep a{color:var(--on-blue)}
.lede,.small,.crumb{font-variant-numeric:proportional-nums lining-nums}


/* ---- v5.1 polish (9 Nov 2026): final referee pass ---- */
.body section>:not(.table-wrap):not(figure){max-width:64ch}
.body section>.table-wrap:last-child{margin-bottom:0}
.body section>.table-wrap:last-child tr:last-child>*{border-bottom:0}
.sec.mist{background:var(--paper);border-top:1px solid var(--line)}
.sec+.sec:not(.blue):not(.deep):not(.mist){border-top:1px solid var(--line)}
.status-key{list-style:none;margin:0 0 16px;padding:0}
.status-key li{display:grid;grid-template-columns:12ch minmax(0,1fr);gap:4px 16px;align-items:baseline;margin:0 0 12px}
.status-key .tag{justify-self:start}
@media (max-width:960px){
  .top .wrap{column-gap:0}
  #navToggle{min-height:44px}
}

/* v5.2: on phones the contact call stays within reach after the first screen */
.sticky-cta{display:none}
@media (max-width:720px){
  /* step 5: a full-width bar docked to the bottom edge, with page padding of the same height, so it never sits on top of text */
  .sticky-cta{display:block;position:fixed;left:0;right:0;bottom:0;z-index:40;box-sizing:border-box;min-height:52px;font:600 16px/20px var(--text);padding:16px 16px calc(16px + env(safe-area-inset-bottom));text-align:center;background:var(--cobalt);color:#fff;text-decoration:underline;text-underline-offset:3px;border-top:1px solid rgba(255,255,255,.5);box-shadow:0 -6px 16px rgba(14,28,31,.16);transform:translateY(110%);transition:transform .2s ease}
  .sticky-cta.on{transform:none}
  footer.site{padding-bottom:calc(56px + 52px + env(safe-area-inset-bottom))}
  .table-wrap caption{background:var(--paper)}
  .chart-scroll{overflow-x:auto}
  .chart-scroll img{min-width:560px}
}
@media (prefers-reduced-motion:reduce){.sticky-cta{transition:none}}
/* v5.2: tap targets and landing position */
#contact,#leadForm{scroll-margin-top:16px}
.lf-reassure{margin:10px 0 0;font-size:15px;color:var(--on-blue-2)}
#lf-note a{color:#fff}
@media (max-width:960px){
  footer.site li{margin:0}
  footer.site li a{display:inline-block;min-width:44px;padding:12px 0}
  .more,.acts a,.hero-actions a:not(.btn){display:inline-block;padding:10px 0}
  .toc a{display:block;padding:10px 0}
}

/* final gate, 10 Nov */
.facts-strip .tag{color:#fff;border-color:rgba(255,255,255,.55)}
tbody th{border-bottom:1px solid var(--line)}

/* tap targets (10 Nov): larger hit area, unchanged appearance */
.brand{padding:4px 0}
footer.site .brand{display:inline-block;padding:5px 0}
.crumb a{display:inline-block;padding:10px 0;margin:-10px 0}
@media (max-width:960px){.toc a{padding:12px 0} footer.site li a{display:inline-block;padding:6px 0}}
.sticky-cta:not(.on){visibility:hidden}

/* form: mark invalid fields (10 Nov) */
#leadForm [aria-invalid="true"]{outline:2px solid #ffb4a8;outline-offset:1px}
#leadForm input[type="checkbox"][aria-invalid="true"]{outline-offset:3px}

/* heat-map tables on research notes (10 Nov) */
.heat td.num,.heat thead th{padding:8px 10px;text-align:right}
.heat td.num:last-child,.heat thead th:last-child{padding-right:10px}
.heat .hm1{background:#fff2d4;color:#5c4a18}
.heat .hm2{background:#ffd691;color:#5c3a0e}
.heat .hm3{background:#ffab5e;color:#472400}
.heat .hm4{background:#f57c4b;color:#3a1400}
.heat .hm5{background:#df4630;color:#fff}
.heat .hm6{background:#a81d12;color:#fff}
.heat-key i{display:inline-block;width:22px;height:12px;border-radius:3px;margin:0 2px;vertical-align:middle}
.heat-key .hm1{background:#fff2d4}.heat-key .hm2{background:#ffd691}.heat-key .hm3{background:#ffab5e}.heat-key .hm4{background:#f57c4b}.heat-key .hm5{background:#df4630}.heat-key .hm6{background:#a81d12}
.page-head h1.long{font-size:clamp(30px,3.6vw,48px);max-width:26ch}

/* Check It pages (10 Nov) */
.tag-ok{color:#1d6b3a;border-color:#1d6b3a}.tag-warn{color:#8a5a00;border-color:#8a5a00}.tag-bad{color:#a12a1e;border-color:#a12a1e}
.doc details{margin:0 0 16px}.doc summary{cursor:pointer;font-weight:600;padding:12px 0}
.body details{margin:0 0 16px}.body summary{cursor:pointer;font-weight:600;padding:12px 0}
@media (max-width:720px){.chart-scroll svg{min-width:560px}}
.head-acts .small a[aria-current]{text-decoration:none;font-weight:600}
.chart-scroll svg{display:block;width:100%;height:auto}
.doc details[open]>summary{margin-bottom:16px}
.doc blockquote,.body blockquote{margin:8px 0 0;padding-left:16px;border-left:2px solid var(--line)}
.doc,.body{overflow-wrap:break-word}
.doc code,.body code{font-size:.9em}

/* gate 4 fixes (10 Nov) */
@media (max-width:820px){.chart-scroll svg{min-width:760px}}
.body section>.table-wrap:last-child thead tr>*{border-bottom:2px solid var(--ink)}
.heat td.num,.heat thead th{padding:8px 7px}
.heat td.num:last-child,.heat thead th:last-child{padding-right:7px}
.body figure img.shot{max-width:min(100%,620px);border:1px solid var(--line);border-radius:var(--r)}