/* The glyso blog. Shares the homepage's tokens, nav and footer; one file for
   the blog index and every article so a new post is HTML only. */
:root{
  --ground:#FFFFFF; --ink:#16191A; --body:#3A4345; --secondary:#5C6668;
  --mark:#98A1A2; --hair:#E4E7E6; --fill:#EDEFEE;
  --cream:#F7F0E4; --cream-edge:#E9E0D0;
  --accent:#C67139; --halo:#F6DFC8;
  --sage:#6D9B7E; --band:#F0F4EC; --band-edge:#D9E2D2; --ai:#F7FAF5;
  --soft-on-ink:#B9C1C2; --ink-raise:#22272A; --ink-line:#343B3E;
  --sans:'IBM Plex Sans',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --r-sm:12px; --r-md:14px; --r-lg:22px; --wrap:1180px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--ground);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;height:auto;display:block}
a{color:inherit}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:6px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip:focus{position:fixed;top:12px;left:12px;width:auto;height:auto;clip:auto;background:#fff;padding:10px 14px;border-radius:999px;z-index:50}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 32px}
.over{font-size:11px;font-weight:600;letter-spacing:1.6px;text-transform:uppercase;color:var(--secondary)}
h1,h2{text-wrap:balance}
.btn{display:inline-flex;align-items:center;gap:10px;font:600 14px/1 var(--sans);text-decoration:none;border-radius:999px;padding:11px 20px;border:1px solid transparent;background:var(--ink);color:#fff;cursor:pointer}
.btn:hover{background:#2C3234}
.btn-lg{font-size:15px;padding:16px 26px}
.btn-on-ink{background:#fff;color:var(--ink)}
.btn-on-ink:hover{background:var(--fill)}

/* nav and footer: the homepage's */
.nav{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--hair)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:600;font-size:21px;letter-spacing:-.02em}
.brand img{width:34px;height:34px}
.nav ul{display:flex;gap:30px;list-style:none;font-size:14.5px;font-weight:500;color:var(--body)}
.nav ul a{text-decoration:none}
.nav ul a:hover,.nav ul a[aria-current]{color:var(--ink)}
.nav ul a[aria-current]{text-decoration:underline;text-underline-offset:6px;text-decoration-thickness:1.5px}
footer{background:var(--ink);color:var(--soft-on-ink);padding:40px 0 64px;font-size:13px}
footer .wrap{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:start}
footer .brand{color:#fff;font-size:18px}
footer .brand img{width:28px;height:28px}
footer nav{display:flex;gap:22px;flex-wrap:wrap}
footer a{color:var(--soft-on-ink);text-decoration:none}
footer a:hover{color:#fff}
footer :focus-visible{outline-color:#fff}
footer .legal,footer .disclaimer{grid-column:1/-1;max-width:78ch;font-size:12px;line-height:1.65;color:#8E9799;margin:0}

/* breadcrumb */
.crumbs{padding-top:28px;font-size:13px;color:var(--secondary)}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px}
.crumbs li+li::before{content:"/";margin-right:8px;color:var(--mark)}
.crumbs a{text-decoration:none}
.crumbs a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:3px}

/* ── blog index ── */
.bhead{padding-top:40px;padding-bottom:48px}
.bhead h1{margin-top:16px;font-weight:300;font-size:clamp(42px,6.4vw,80px);line-height:1;letter-spacing:-.035em;max-width:14ch}
.bhead .lede{margin-top:20px;font-size:18px;line-height:1.6;color:var(--body);max-width:56ch}
.themes{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px;list-style:none}
.themes a{display:inline-flex;align-items:center;gap:8px;font:500 14px/1 var(--sans);text-decoration:none;padding:11px 16px;border:1px solid var(--hair);border-radius:999px;color:var(--body)}
.themes a:hover{border-color:var(--ink);color:var(--ink)}
.themes .n{font:500 12px var(--mono);color:var(--secondary)}

.feature{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:0;border:1px solid var(--hair);border-radius:var(--r-lg);overflow:hidden;text-decoration:none;transition:border-color .2s}
.feature:hover{border-color:var(--ink)}
.feature .art{background:var(--cream);border-right:1px solid var(--hair);display:flex;align-items:center;justify-content:center;padding:36px;min-height:300px}
.feature .txt{padding:40px 40px 36px;display:flex;flex-direction:column}
.feature h2{margin-top:14px;font-weight:400;font-size:clamp(26px,3vw,36px);line-height:1.12;letter-spacing:-.02em}
.feature p{margin-top:14px;color:var(--body);font-size:16px;max-width:46ch}
.feature .meta,.card .meta{margin-top:auto;padding-top:22px;font:500 12.5px var(--mono);color:var(--secondary)}
.more{margin-top:10px;font-weight:600;font-size:14.5px;color:var(--ink)}

.theme{padding-top:72px;scroll-margin-top:80px}
.theme-head{display:flex;justify-content:space-between;align-items:baseline;gap:20px;border-bottom:1px solid var(--hair);padding-bottom:14px}
.theme-head h2{font-weight:500;font-size:22px;letter-spacing:-.015em}
.theme-head p{font-size:14px;color:var(--secondary);max-width:52ch}
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin-top:24px;list-style:none}
.card{display:flex;flex-direction:column;height:100%;text-decoration:none;border:1px solid var(--hair);border-radius:var(--r-lg);padding:26px 24px 22px;transition:border-color .2s}
.card:hover{border-color:var(--ink)}
.card h3{margin-top:10px;font-weight:500;font-size:19px;line-height:1.3;letter-spacing:-.01em}
.card p{margin-top:10px;font-size:15px;color:var(--body)}
.card.soon{border-style:dashed;color:var(--secondary)}
.card.soon h3{color:var(--body)}
.blog-end{padding-bottom:112px}

/* ── article ── */
.ahead{padding-top:32px;padding-bottom:40px;border-bottom:1px solid var(--hair)}
.ahead .over a{text-decoration:none}
.ahead h1{margin-top:16px;font-weight:300;font-size:clamp(38px,5.6vw,66px);line-height:1.02;letter-spacing:-.035em;max-width:17ch}
.ahead .standfirst{margin-top:20px;font-size:19px;line-height:1.55;color:var(--body);max-width:52ch}
.byline{margin-top:24px;display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;font-size:13.5px;color:var(--secondary)}
.byline b{font-weight:600;color:var(--ink)}
.byline .mono{font:500 12.5px var(--mono)}

.article{display:grid;grid-template-columns:220px minmax(0,1fr);gap:72px;padding-top:44px;padding-bottom:96px}
.toc{position:sticky;top:96px;align-self:start}
.toc summary{list-style:none;cursor:default}
.toc summary::-webkit-details-marker{display:none}
.toc ol{list-style:none;margin-top:14px;border-left:1px solid var(--hair)}
.toc li a{display:block;padding:6px 0 6px 14px;margin-left:-1px;border-left:2px solid transparent;font-size:13.5px;line-height:1.4;color:var(--secondary);text-decoration:none}
.toc li a:hover{color:var(--ink)}
.toc li a.on{color:var(--ink);border-left-color:var(--ink);font-weight:500}

.prose{max-width:66ch;font-size:17px;line-height:1.72;color:var(--body)}
.prose h2{scroll-margin-top:96px;margin:60px 0 14px;padding-top:30px;border-top:1px solid var(--hair);font-weight:500;font-size:26px;line-height:1.22;letter-spacing:-.018em;color:var(--ink)}
.prose h3{margin:28px 0 8px;font-weight:600;font-size:17.5px;color:var(--ink)}
.prose p{margin:0 0 18px}
.prose strong{font-weight:600;color:var(--ink)}
.prose a{color:var(--ink);text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--mark)}
.prose a:hover{text-decoration-color:var(--ink)}
.prose ul,.prose ol{margin:0 0 20px 22px}
.prose li{margin-bottom:8px;padding-left:4px}
.prose li::marker{color:var(--secondary)}

.key{border:1px solid var(--band-edge);background:var(--ai);border-radius:var(--r-lg);padding:24px 26px 8px}
.key .over{color:var(--ink)}
.key ul{list-style:none;margin:14px 0 0}
.key li{position:relative;padding-left:22px;margin-bottom:14px;font-size:16px;line-height:1.55}
.key li::before{content:"";position:absolute;left:2px;top:.62em;width:8px;height:8px;border-radius:50%;background:var(--sage)}

.fig{margin:32px 0 34px}
.fig .frame{border:1px solid var(--hair);border-radius:var(--r-lg);padding:26px 24px 20px;background:#fff}
.fig figcaption{margin-top:12px;font-size:13.5px;line-height:1.5;color:var(--secondary)}
.fig svg text{font-family:var(--sans)}

/* the timeline */
.tl{list-style:none;margin:0;padding:0;position:relative}
.tl::before{content:"";position:absolute;left:84px;top:8px;bottom:8px;width:1px;background:var(--hair)}
.tl li{display:grid;grid-template-columns:72px 24px minmax(0,1fr);gap:0;align-items:start;padding:10px 0;margin:0}
.tl .yr{font:500 13px/1.5 var(--mono);color:var(--ink);text-align:right;padding-top:1px}
.tl .dot{width:9px;height:9px;border-radius:50%;background:#fff;border:2px solid var(--ink);margin:6px 0 0 8px;position:relative;z-index:1}
.tl li.hl .dot{background:var(--accent);border-color:var(--accent)}
.tl .ev{font-size:15px;line-height:1.5;color:var(--body);padding-left:10px}
.tl .ev b{display:block;font-weight:600;color:var(--ink);font-size:15.5px}

.callout{margin:28px 0;padding:20px 22px;border-left:3px solid var(--accent);background:var(--cream);border-radius:0 var(--r-md) var(--r-md) 0;font-size:16px}
.callout p:last-child{margin-bottom:0}

.faq details{border-bottom:1px solid var(--hair);padding:16px 0}
.faq details:first-of-type{border-top:1px solid var(--hair)}
.faq summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:20px;font-weight:600;color:var(--ink);font-size:16.5px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";flex:none;width:12px;height:12px;margin-top:7px;background:linear-gradient(var(--ink),var(--ink)) center/12px 1.5px no-repeat,linear-gradient(var(--ink),var(--ink)) center/1.5px 12px no-repeat;transition:transform .25s ease-out}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin:10px 0 0}

.sources{font-size:14px;line-height:1.55;color:var(--secondary)}
.sources ol{margin-left:20px}
.sources li{margin-bottom:8px}
.sources a{color:var(--secondary)}

.author{display:flex;gap:16px;align-items:flex-start;margin-top:40px;padding:22px 0;border-top:1px solid var(--hair);border-bottom:1px solid var(--hair);font-size:14.5px;color:var(--body)}
.author img{width:44px;height:44px;flex:none}
.author b{display:block;color:var(--ink);font-weight:600;font-size:15px}
.note{margin-top:20px;font-size:13px;line-height:1.6;color:var(--secondary)}

.cta{margin-top:48px;background:var(--ink);color:#fff;border-radius:var(--r-lg);padding:36px 34px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:center}
.cta h2{margin:0;padding:0;border:0;color:#fff;font-weight:300;font-size:28px;line-height:1.15;letter-spacing:-.02em}
.cta h2 b{font-weight:600}
.cta p{margin:10px 0 0;color:var(--soft-on-ink);font-size:15px;max-width:44ch}

.related{padding-bottom:104px}
.related .theme-head{padding-top:0}

@media (max-width:980px){
  .nav .wrap{flex-wrap:wrap;height:auto;padding-top:12px;padding-bottom:8px;row-gap:6px}
  .nav ul{order:3;width:100%;overflow-x:auto;gap:22px;padding:6px 0 4px;font-size:14px;white-space:nowrap;scrollbar-width:none}
  .nav ul::-webkit-scrollbar{display:none}
  .prose h2{scroll-margin-top:124px}
  .article{grid-template-columns:1fr;gap:28px;padding-top:28px}
  .toc{position:static;border:1px solid var(--hair);border-radius:var(--r-md);padding:14px 16px}
  .toc summary{cursor:pointer;display:flex;justify-content:space-between;align-items:center}
  .toc summary::after{content:"";width:11px;height:11px;background:linear-gradient(var(--ink),var(--ink)) center/11px 1.5px no-repeat,linear-gradient(var(--ink),var(--ink)) center/1.5px 11px no-repeat;transition:transform .25s ease-out}
  .toc[open] summary::after{transform:rotate(45deg)}
  .feature{grid-template-columns:1fr}
  .feature .art{border-right:0;border-bottom:1px solid var(--hair);min-height:0;padding:28px}
  .cards{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .wrap{padding-left:20px;padding-right:20px}
  .prose{font-size:16.5px}
  .feature .txt{padding:26px 22px 24px}
  .cards{grid-template-columns:1fr}
  .theme-head{flex-direction:column;gap:6px}
  .tl::before{left:64px}
  .tl li{grid-template-columns:52px 24px minmax(0,1fr)}
  .cta{grid-template-columns:1fr;padding:28px 24px}
  .fig .frame{padding:20px 14px 16px}
  footer .wrap{grid-template-columns:1fr}
}
@media (prefers-reduced-motion: reduce){ html{scroll-behavior:auto} }

/* article figures: drawn in the homepage's chart language */
.f-track{fill:var(--fill)}
.f-band{fill:var(--band)}
.f-spill{fill:var(--halo)}
.f-thr{stroke:var(--accent);stroke-width:1.6;stroke-dasharray:5 4}
.f-grid{stroke:var(--hair);stroke-width:1;stroke-dasharray:3 4}
.f-line{fill:none;stroke:var(--accent);stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.f-seen{fill:var(--halo)}
.f-low{fill:#fff;stroke:var(--ink);stroke-width:2}
.f-lab{font:600 13px var(--sans);fill:var(--ink)}
.f-in{font:500 13px var(--sans);fill:var(--secondary)}
.f-in-ink{fill:var(--ink)}
.f-tick{font:500 11.5px var(--mono);fill:var(--secondary)}
.f-note{font:500 11.5px var(--sans);fill:var(--secondary)}
.chip-soon{display:inline-flex;align-items:center;gap:8px;font:500 14px/1 var(--sans);padding:11px 16px;border:1px dashed var(--hair);border-radius:999px;color:var(--secondary)}
.chip-soon .n{font:500 12px var(--mono);color:var(--mark)}
.feature .art svg{width:100%;max-width:360px}
/* each figure is drawn twice: a wide one, and a narrow one with type that stays readable on a phone */
.fig-narrow{display:none}
@media (max-width:640px){ .fig-wide{display:none} .fig-narrow{display:block} }

/* round 1 fixes */
.f-band{fill:var(--band-edge);stroke:var(--sage);stroke-width:1}
.callout{background:var(--fill)}
.chip-soon .n{color:var(--secondary)}
.nav .btn{min-height:44px}
.themes a,.chip-soon{min-height:44px;padding:0 16px}
.faq summary{min-height:44px;align-items:center}
.faq summary::after{margin-top:0}
.faq details{padding:6px 0}
.crumbs a,.ahead .over a{display:inline-block;padding:13px 0;margin:-13px 0}
.cta .cta-h{margin:0;color:#fff;font-weight:300;font-size:28px;line-height:1.15;letter-spacing:-.02em}
.cta .cta-h b{font-weight:600}
@media (max-width:980px){ .toc li a{padding:11px 0 11px 14px} }
/* round 2 fixes */
.f-band{stroke:none}
.prose a.btn,.cta .btn{text-decoration:none;justify-content:center}
.toc{padding-top:0;padding-bottom:0}
.toc summary{min-height:44px;display:flex;align-items:center}
.fig-narrow .f-tick,.fig-narrow .f-note,.feature .art .f-tick,.feature .art .f-note{font-size:12.5px}
.nav ul a,footer nav a{display:inline-block;padding:13px 0}
@media (max-width:980px){ .toc li a{padding:12.5px 0 12.5px 14px} }
.card.soon{border-color:var(--mark)}