:root{--blue:#2143F3;--blue-dark:#1733c4;--green:#33E79B;--green-dark:#22d68a;--ink:#23222D;--text:#4B4B57;--muted:#757575;--line:#E6E8EF;--grey:#F4F5F9;--head:"Graphik",system-ui,-apple-system,"Segoe UI",sans-serif;--body:"Source Sans 3","Source Sans Pro",system-ui,sans-serif}
*{box-sizing:border-box}
section[id],nav[id]{scroll-margin-top:70px}
body{margin:0;font:18px/1.55 var(--body);color:var(--text);background:#fff}
h1,h2,h3,.eyebrow,.btn,.chip,.toc-title,.stat b,.picker-label{font-family:var(--head);color:var(--ink)}
h1{font-size:clamp(38px,5vw,64px);line-height:1.04;font-weight:700;letter-spacing:-.015em;margin:.25em 0 .45em;color:#fff}
h1 .year{color:var(--green)}
h2{font-size:clamp(26px,3vw,40px);line-height:1.15;font-weight:700;margin:0 0 .5em}
h2 .accent{color:var(--blue)}
p{margin:0 0 1em}
a{color:var(--blue)}
.wrap{max-width:1140px;margin:0 auto;padding:0 24px}
.eyebrow{display:inline-block;font-size:14px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--blue)}
.eyebrow.light{color:var(--blue)}
.eyebrow.dark{color:var(--green)}
.btn{display:inline-block;background:var(--blue);color:#fff;text-decoration:none;font-weight:500;font-size:16px;padding:12px 26px;border-radius:3px;white-space:nowrap;border:0;cursor:pointer}
.btn:hover{background:var(--blue-dark)}
.btn.green{background:var(--green);color:var(--ink)}.btn.green:hover{background:var(--green-dark)}

/* hero */
.hero{background:var(--blue);color:#fff;padding:64px 0 56px}
.hero .wrap{display:grid;grid-template-columns:1.35fr .65fr;gap:56px;align-items:start}
.hero .kicker{font:600 15px var(--head);color:var(--green)}
.hero .kicker small{display:block;font:400 14px var(--body);color:rgba(255,255,255,.75);margin-top:2px}
.hero .dates{font-size:15px;line-height:1.4;color:rgba(255,255,255,.8);margin:-.6em 0 1.4em}.hero .dates span{white-space:nowrap}
.hero .lede{font-size:20px;line-height:1.5;color:#fff;max-width:600px}
.hero .why{font:600 16px var(--head);color:#fff;margin:22px 0 6px}
.hero ul{margin:0;padding-left:20px;color:#fff}
.hero li{margin:4px 0}
/* the revision history (revisions.py, KS 2026-10-17): a faint "Updated <date>" in the lower right corner of the cover, the history in a popover */
.hero .wrap{position:relative}
.rev-open{position:absolute;right:24px;bottom:-40px;padding:2px 0;border:0;background:none;font:400 13px/1.4 var(--body);color:rgba(255,255,255,.55);cursor:pointer}
.rev-open:hover,.rev-open:focus-visible{color:#fff;text-decoration:underline}
.rev-pop{display:none;width:min(520px,calc(100vw - 32px));max-height:min(70vh,560px);overflow:auto;margin:auto;padding:20px 24px 8px;border:0;border-radius:10px;background:#fff;color:var(--text);box-shadow:0 12px 40px rgba(35,34,45,.18);text-align:left}
.rev-pop:popover-open{display:block}
.rev-pop::backdrop{background:rgba(244,245,249,.75)}
.rev-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:8px}
.rev-head h2{font-size:22px;margin:0;color:var(--ink)}
.rev-x{flex:none;width:36px;height:36px;border:0;border-radius:50%;background:var(--grey);color:var(--ink);font:400 24px/36px var(--body);cursor:pointer}
.rev-list{list-style:none;margin:0;padding:0}
.rev-list li{padding:12px 0;border-top:1px solid var(--line)}
.rev-list time{display:block;font:600 14px var(--head);color:var(--ink)}
.rev-list p{margin:4px 0 0;font-size:16px;line-height:1.5}
.stats{display:grid;gap:12px;align-content:start}
.stat{display:flex;align-items:center;gap:16px;text-decoration:none;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);border-radius:12px;padding:12px 20px;transition:.15s}.stat:hover{background:rgba(255,255,255,.2);border-color:rgba(255,255,255,.6)}
.stat b{font-size:52px;min-width:120px;font-weight:700;line-height:1;color:var(--green)}
.stat span{font:600 17px/1.25 var(--head);color:#fff;max-width:170px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.btn.outline{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.7)}.btn.outline:hover{background:rgba(255,255,255,.12)}
.takeaways-section{padding:64px 0 56px;background:var(--green);color:var(--ink)}.takeaways-section .eyebrow{color:var(--ink)}.takeaways-section h2 .accent{color:#fff}.takeaways-section .lede-dark{font-size:19px;max-width:720px}.picker{margin-top:22px}
.hero-card{background:#fff;color:var(--text);border-radius:6px;padding:28px 28px 22px;box-shadow:0 12px 40px rgba(0,0,0,.18)}
.hero-card h3{font:700 20px var(--head);color:var(--ink);margin:0 0 10px}
.hero-card p{font-size:16px;margin:0 0 14px}
.picker-label{font-size:14px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--ink);margin:0 0 10px}
.chips{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.chip{border:1.5px solid transparent;background:#fff;color:var(--ink);font-weight:500;font-size:15px;padding:9px 14px;border-radius:999px;cursor:pointer;transition:.15s}
.chip:hover{border-color:var(--blue);color:var(--blue)}
.chip[aria-pressed="true"]{background:var(--blue);border-color:var(--blue);color:#fff}
.chips select{font:500 15px var(--head);padding:9px 12px;margin-left:6px;border-radius:999px;border:1.5px solid var(--line);background:#fff;color:var(--ink);max-width:100%}
.hero-card .hint{font-size:14px;color:var(--muted);margin:14px 0 0}
/* trusted */
.trusted{background:var(--grey);padding:28px 0}
.trusted .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:20px 48px}
.trusted .label{font:700 18px/1.2 var(--head);color:var(--ink);max-width:140px}
.trusted .logos{display:flex;flex-wrap:wrap;gap:16px 44px;align-items:center}
.trusted .logos span{font:700 22px var(--head);color:#9a9ba6;letter-spacing:-.01em}
/* two-tone band */
.two-tone{display:grid;grid-template-columns:1.25fr .75fr;gap:0;border-radius:8px;overflow:hidden}
.tone{padding:36px 36px 32px}
.tone.blue{background:#fff;color:var(--ink)}
.tone.green{background:var(--blue);color:#fff}
.tone .eyebrow{margin-bottom:14px}
.takeaways{list-style:none;margin:0;padding:0;display:grid;gap:18px}
.takeaways li{display:flex;gap:14px}
.takeaways .n{flex:0 0 30px;height:30px;border-radius:50%;background:var(--blue);color:#fff;font:700 15px/30px var(--head);text-align:center}
.takeaways p{margin:0 0 4px;color:var(--ink);font-size:17px;line-height:1.45}
.evidence{font:600 14px var(--head);color:var(--blue);text-decoration:none}
.learn{margin:0 0 22px;padding-left:22px;font-size:17px;color:#fff}
.learn li{margin:8px 0}
.cta-note{font-size:15px;color:rgba(255,255,255,.85);margin:14px 0 0}
/* ask a question */
.ask{margin-top:48px}.ask h2{font-size:clamp(24px,2.4vw,32px)}
.ask-form{display:flex;flex-direction:column;align-items:flex-start;gap:12px;max-width:820px}
.ask-form textarea{width:100%;min-height:140px;font:18px/1.5 var(--body);color:var(--ink);background:#fff;border:1.5px solid rgba(0,0,0,.18);border-radius:8px;padding:12px 14px;resize:vertical}
.ask-form textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(33,67,243,.18)}
/* faq */
.faq{margin-top:48px}
.faq h2{font-size:clamp(24px,2.4vw,32px)}
.faq-item{border-top:1px solid rgba(0,0,0,.18);padding:4px 0}
.faq-item:last-child{border-bottom:1px solid rgba(0,0,0,.18)}
.faq-item summary{cursor:pointer;font:600 18px var(--head);color:var(--ink);padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";color:var(--ink);font-weight:400;font-size:24px;line-height:1}
.faq-item[open] summary::after{content:"–"}
.faq-item p{margin:0 0 14px;max-width:820px;color:#1f3a2e}
/* contents */
.contents{padding:64px 0}
.toc{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px;margin-top:24px}
.toc-card{display:flex;flex-direction:column;gap:6px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:22px;text-decoration:none;color:var(--text);transition:.15s}
.toc-card:hover{border-color:var(--blue);transform:translateY(-2px)}
.toc-n{font:700 13px var(--head);color:var(--blue);letter-spacing:.06em}
.toc-title{font-size:20px;font-weight:700}
.toc-blurb{font-size:15px;color:var(--muted)}
/* models teaser */
.models{padding:56px 0 8px}
.models .sub{font:600 17px var(--head);color:var(--blue);margin:8px 0 18px}
.vendors{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px 18px}
.vendors li{display:flex;align-items:flex-start;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:8px;background:#fff}
.vendors .logo{flex:0 0 40px;width:40px;height:40px;display:flex;align-items:center;justify-content:center}
.vendors .logo img{max-width:40px;max-height:40px;object-fit:contain}
.vendors .mark{width:40px;height:40px;border-radius:8px;background:var(--grey);border:1px solid var(--line);font:700 15px/40px var(--head);color:var(--muted);text-align:center}
.vendors b{display:block;font:600 16px var(--head);color:var(--ink);line-height:1.2}
.vendors .fam{display:block;font-size:14px;color:var(--muted);line-height:1.35;margin-top:3px}
.chip-ow{display:inline-block;font:600 11px var(--head);color:var(--ink);background:#E6FBF1;border:1px solid #9fe9c8;border-radius:999px;padding:1px 7px;vertical-align:middle;margin-left:2px}
.models .more,.spec .more{margin:22px 0 0}
.legal{font-size:13px;line-height:1.45;color:var(--muted);margin:14px 0 0}
/* closing band */
.closing{background:var(--blue);color:#fff;text-align:center;padding:64px 0}
.closing h2{color:#fff;font-size:clamp(28px,3.4vw,44px)}
.closing h2 .accent{color:var(--green)}
@media (max-width:860px){.hero .wrap,.two-tone{grid-template-columns:1fr}.stats{display:grid;gap:12px;align-content:start}.stat b{font-size:44px}}

.tk-title{font-size:clamp(28px,3.2vw,44px);line-height:1.25;margin:0 0 8px}
.role-word{font:inherit;color:var(--ink);background:transparent;border:0;border-bottom:3px solid transparent;padding:0 2px 2px;cursor:pointer;opacity:.55;white-space:nowrap}
.role-word:hover{opacity:.85}
.role-word[aria-pressed="true"]{opacity:1;border-bottom-color:var(--ink)}
.role-word-select{font:inherit;color:var(--ink);background:transparent;border:0;border-bottom:3px solid transparent;border-radius:0;padding:0 .8em 2px 2px;cursor:pointer;opacity:.55;-webkit-appearance:none;appearance:none;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='20' height='12' viewBox='0 0 20 12'><path d='M2 2l8 8 8-8' fill='none' stroke='%2323222D' stroke-width='2.5'/></svg>");background-repeat:no-repeat;background-position:right .05em center;background-size:.5em}.role-word-select:hover{opacity:.85}.role-word-select.active{opacity:1;border-bottom-color:var(--ink)}.role-word-select option{font-size:16px;color:var(--ink)}
.tk-list{margin-top:12px}
.tk{padding:36px 0;border-top:1px solid rgba(0,0,0,.14)}
.tk[hidden]{display:none}
.tk-head{margin-bottom:8px}
.tk-row{display:grid;grid-template-columns:2fr 1fr;gap:40px;align-items:start}
.tk-row.solo{grid-template-columns:1fr}
.tk-n{display:inline-block;font:700 13px var(--head);letter-spacing:.08em;text-transform:uppercase;color:var(--blue);margin-bottom:10px}
.tk h3{font-size:clamp(22px,2.2vw,28px);line-height:1.25;margin:0 0 12px}
.tk p,.tk li{font-size:18px;margin:0 0 12px;color:#1f3a2e}.tk ul,.tk ol{padding-left:22px;margin:0 0 12px}.tk li{margin:0 0 6px}
.tk .tk-links{margin-top:6px}
.tk-figure{margin:0;background:#fff;border-radius:10px;padding:14px;box-shadow:0 8px 30px rgba(0,0,0,.08)}
.tk-figure svg{width:100%;height:auto;display:block}
.tk-figure figcaption{font-size:14px;color:var(--muted);padding:8px 4px 0}
.tk-figure .tiles{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.tk-figure .tile{background:var(--grey);border-radius:10px;padding:10px 12px}
.tk-figure .tile .v{font:600 24px/1.1 var(--head);color:var(--blue)}.tk-figure .tile .v.doc{color:var(--ink)}.tk-figure .tile .l{font-size:13px;margin-top:4px;color:var(--text)}.tk-figure .small{font-size:13px}
.tk-figure.zoomable{cursor:zoom-in}
.lb{position:fixed;inset:0;background:rgba(255,255,255,0);z-index:50;display:flex;align-items:center;justify-content:center;overflow:hidden;transition:background .28s}
.lb.on{background:rgba(244,245,249,.97)}.lb[hidden]{display:none}
.lb-img{background:#fff;border-radius:10px;box-shadow:0 12px 40px rgba(0,0,0,.12);transform-origin:center center;will-change:transform;cursor:zoom-in;user-select:none}.lb-img svg{display:block}
.lb-x{position:absolute;top:14px;right:18px;width:44px;height:44px;border:0;border-radius:50%;background:var(--ink);color:#fff;font:400 26px/44px var(--body);cursor:pointer;z-index:2}
.cta{display:flex;gap:24px;align-items:center;justify-content:space-between;margin:40px 0 8px;padding:24px 28px;border-radius:12px;background:var(--blue);color:#fff}
.cta-title{font:700 20px var(--head);color:#fff;margin:0 0 4px}.cta-text{margin:0;opacity:.85}
.tk-cta{margin:0 0 36px}.cta[hidden]{display:none}
@media (max-width:860px){.tk-row{grid-template-columns:1fr}.cta{flex-direction:column;align-items:flex-start}.tk-title .role-word{display:inline}}

.spec{padding:56px 0}
.spec.alt{background:var(--grey)}
.spec .lede-dark{font-size:19px;max-width:760px;margin-bottom:28px}
.levels{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.level{background:#fff;border:1px solid var(--line);border-radius:8px;padding:24px;position:relative}
.level:nth-child(2){border-top:4px solid var(--blue)}.level:nth-child(3){border-top:4px solid var(--green)}.level:nth-child(1){border-top:4px solid #C9D2FB}
.lv-n{display:block;font:700 13px var(--head);letter-spacing:.08em;color:var(--blue);text-transform:uppercase}
.lv-name{display:block;font:700 26px var(--head);color:var(--ink);margin:6px 0 2px}
.lv-sub{display:block;font:600 15px var(--head);color:var(--blue);margin-top:12px}
.level p{font-size:15px;color:var(--text);margin:8px 0 0}
.langs{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.langs li{font:500 14px var(--head);color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 12px}
.langs li.excluded{background:var(--grey);color:var(--muted);border-color:var(--grey)}
.langs li:has(a){padding:0}
.langs li a{display:block;padding:6px 12px;color:inherit;text-decoration:none;border-radius:999px}
.langs li:has(a):hover{border-color:var(--blue)}
.langs li a:hover{color:var(--blue)}
@media (max-width:860px){.levels{grid-template-columns:1fr}}

.subnav{position:sticky;top:0;z-index:15;background:#fff;border-bottom:1px solid var(--line);transform:translateY(-100%);opacity:0;pointer-events:none;transition:.2s;height:0;overflow:hidden}
.subnav.on{transform:none;opacity:1;pointer-events:auto;height:auto;overflow:visible}
.subnav .wrap{display:flex;align-items:center;gap:22px;height:52px;overflow-x:auto}
.subnav a{font:500 15px var(--head);color:var(--ink);text-decoration:none;white-space:nowrap;opacity:.8}
.subnav a:hover,.subnav a.active{color:var(--blue);opacity:1}
.subnav a.strong{font-weight:700}
.subnav .chip-demo{margin-left:auto;background:var(--blue);color:#fff;padding:7px 14px;border-radius:999px;opacity:1}
.subnav .chip-demo:hover{background:var(--blue-dark);color:#fff}
/* sticky bar menu: when the links do not fit next to "Book a demo", they fold behind a hamburger on the left */
.nav-links{display:flex;align-items:center;gap:22px}
.nav-burger{display:none;flex:0 0 auto;align-items:center;justify-content:center;width:40px;height:40px;margin-left:-9px;padding:0;border:0;border-radius:8px;background:none;color:var(--ink);cursor:pointer}
.nav-burger:hover,.open .nav-burger{color:var(--blue);background:var(--grey)}
.compact .nav-burger{display:flex}.compact .wrap{overflow:visible}
.compact .nav-links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;padding:6px 0;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 14px 28px rgba(0,0,0,.10)}
.compact.open .nav-links{display:flex}
.compact .nav-links a{padding:12px 24px;font-size:16px;opacity:1}.compact .nav-links a+a{border-top:1px solid var(--line)}

.more-chip{display:none;font:600 14px var(--head);color:var(--blue);background:#fff;border:1.5px solid var(--blue);border-radius:999px;padding:7px 14px;cursor:pointer;margin-top:10px}
@media (max-width:860px){
  .collapsible.collapsed > li:nth-child(n+11){display:none}
  .collapsible.collapsed + .more-chip{display:inline-block}
}

.tk-chapter{color:var(--blue);text-decoration:none;border-bottom:1px solid currentColor}


.levels-ladder{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.level-step{background:#fff;border:1px solid var(--line);border-radius:8px;padding:18px 18px 16px;border-top:5px solid var(--blue)}
.level-step.next{border-top-color:var(--green)}
.level-step.out{border-top-color:#C9CDD6;background:var(--grey)}
.level-step.out h3,.level-step.out p{color:var(--muted)}
.ls-head{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:10px}
.ls-n{display:inline-block;width:30px;height:30px;border-radius:50%;background:var(--blue);color:#fff;font:700 15px/30px var(--head);text-align:center}
.level-step.next .ls-n{background:var(--green);color:var(--ink)}.level-step.out .ls-n{background:#C9CDD6;color:#fff}
.ls-status{font:600 12px var(--head);color:var(--ink);background:#EEF1FE;border-radius:999px;padding:3px 9px;white-space:nowrap}
.level-step.next .ls-status,.legend .ls-status.next{background:#E6FBF1}
.level-step.out .ls-status,.legend .ls-status.out{background:#fff;border:1px solid var(--line);color:var(--muted)}
.level-step h3{font-size:18px;line-height:1.25;margin:0 0 6px}
.level-step p{font-size:15px;color:var(--text);margin:0}
.legend{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
@media (max-width:860px){.levels-ladder{grid-template-columns:1fr}}