:root{
  --ink:#0a0e1a;--body:#3f4a63;--muted:#5b6680;--blue:#2f5cff;--blue-ink:#1f3fc4;--violet:#7b5cff;
  --line:#dfe5f1;--wash:#f4f6fa;--card:#fff;--amber:#fff6e0;--amber-line:#e7c36a;--amber-ink:#7a4b00;
  --green:#e8f6ef;--green-ink:#106142;--grey-chip:#eef1f7;
  --display:"Space Grotesk","Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --text:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,"Cascadia Mono",Consolas,monospace;
  --radius:14px
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;color:var(--ink);background:#fff;font:16px/1.6 var(--text)}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px;border-radius:4px}
.wrap{width:min(1140px,calc(100% - 64px));margin-inline:auto}
.skip{position:absolute;left:12px;top:8px;transform:translateY(-160%);z-index:10;background:#fff;padding:8px 12px;border:2px solid var(--blue);border-radius:8px}
.skip:focus{transform:none}
.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}

/* Header */
header.site{border-bottom:1px solid var(--line);background:#fff}
header.site nav{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:16px 24px;flex-wrap:wrap;padding-block:10px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--display);font-weight:750;text-decoration:none;font-size:17px}
.mark{width:32px;height:32px;display:grid;place-items:center;border-radius:9px;background:linear-gradient(140deg,var(--blue),var(--violet));color:#fff;font-size:22px;line-height:1}
.brand small{font-weight:600;color:var(--muted);border-left:1px solid var(--line);padding-left:11px;font-size:14px}
.links{display:flex;align-items:center;gap:6px 22px;flex-wrap:wrap;font-size:15px;font-weight:650}
.links a{text-decoration:none}
.links a:not(.button):hover{text-decoration:underline;text-underline-offset:4px}
.links a[aria-current="page"]:not(.button){color:var(--blue-ink);text-decoration:underline;text-underline-offset:5px;text-decoration-thickness:2px}

/* Buttons */
.button{display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:10px;background:linear-gradient(105deg,#2549e9,#6945e8);color:#fff;font-weight:700;text-decoration:none;box-shadow:0 8px 22px -12px #4f40e3;border:0;font:inherit;font-weight:700;cursor:pointer}
.button:hover{filter:brightness(1.08)}
.button.small{padding:8px 14px;font-size:14px}
.button.ghost{background:#fff;color:var(--blue-ink);border:1.5px solid #c9d4f3;box-shadow:none}
.button.ghost:hover{background:#f5f8ff;filter:none}
.textlink{color:var(--blue-ink);font-weight:700;text-decoration:none}
.textlink:hover{text-decoration:underline;text-underline-offset:4px}
.actions{display:flex;align-items:center;gap:14px 22px;flex-wrap:wrap}

/* Type */
h1,h2,h3{font-family:var(--display);line-height:1.12;margin:0;letter-spacing:-.03em}
h1{font-size:clamp(34px,4.1vw,54px);max-width:18ch}
h2{font-size:clamp(28px,3.6vw,42px);max-width:24ch}
h3{font-size:20px;letter-spacing:-.02em}
p{margin:0 0 14px;overflow-wrap:anywhere}
q,dd,li,td{overflow-wrap:anywhere}
.eyebrow{font:650 12px/1.4 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--blue-ink);margin:0 0 16px;display:flex;align-items:center;gap:9px}
.eyebrow:before{content:"";width:16px;height:1px;background:currentColor}
.accent{background:linear-gradient(105deg,#284bdf,#7046dd);-webkit-background-clip:text;background-clip:text;color:transparent}
.lede{max-width:58ch;font-size:18px;color:var(--body);margin:16px 0 22px}
.section-intro{max-width:64ch;color:var(--body);font-size:17px;margin-top:14px}
code,.mono{font-family:var(--mono);font-size:.88em}
p code,li code,td code{background:var(--grey-chip);padding:1px 5px;border-radius:5px;overflow-wrap:anywhere}

/* Hero */
.hero{background:radial-gradient(ellipse at 88% 8%,#e1e8ff,transparent 52%),linear-gradient(180deg,transparent 60%,#fff),linear-gradient(#0a0e1a08 1px,transparent 1px),linear-gradient(90deg,#0a0e1a08 1px,transparent 1px);background-size:auto,auto,32px 32px,32px 32px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:52px;align-items:start;padding:44px 0 56px}
.hero.inner .hero-grid{display:block;padding:56px 0 40px}
.hero.inner h1{max-width:22ch}
.problem{border-left:4px solid var(--amber-line);background:var(--amber);border-radius:0 12px 12px 0;padding:14px 18px;margin:24px 0 0;max-width:58ch;color:#3b2a05;font-size:15.5px}
.problem strong{color:#2a1c00}
.problem p{margin:0}
.audience{font-size:14.5px;color:var(--muted);margin:14px 0 0}

/* Proof card (hero visual) */
.proof{background:#fff;border:1px solid #d6def0;border-radius:18px;box-shadow:0 28px 60px -40px #2c3fa3;overflow:hidden}
.proof-head{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;align-items:center;padding:12px 16px;background:#f8faff;border-bottom:1px solid var(--line);font:600 11.5px/1.35 var(--mono);letter-spacing:.04em;text-transform:uppercase;color:var(--muted)}
.proof figure{margin:0}
.proof .diagram-link{display:block;padding:10px;border-bottom:1px solid var(--line);overflow-x:auto;-webkit-overflow-scrolling:touch}
.proof .scroll-hint{padding:8px 16px 0}
.proof figcaption{padding:10px 16px 0;font-size:13.5px;color:var(--muted)}
.proof figcaption a{color:var(--blue-ink);font-weight:650}
.decision-card{margin:14px 16px 16px;border:1px solid var(--amber-line);background:var(--amber);border-radius:12px;padding:13px 15px}
.decision-card .meta{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;font:600 11.5px/1.4 var(--mono);color:var(--amber-ink);margin-bottom:6px}
.decision-card p{margin:0;font-weight:650;color:#2a1c00;font-size:15.5px;line-height:1.45}
.decision-card .why{font-weight:400;font-size:14px;color:#4a3a14;margin-top:6px}

/* Chips */
.chip{display:inline-block;font:650 11px/1.3 var(--mono);letter-spacing:.03em;text-transform:uppercase;border-radius:999px;padding:3px 9px;background:var(--grey-chip);color:var(--body);white-space:nowrap}
.chip.ok{background:var(--green);color:var(--green-ink)}
.chip.warn{background:#fff0d6;color:var(--amber-ink)}
.chip.dev{background:#ece8ff;color:#4b2fb8}
.chip.no{background:#f3f4f7;color:#4d5568}

/* Sections */
.band{padding:72px 0}
.band.wash{background:var(--wash);border-block:1px solid var(--line)}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card h3{margin-bottom:8px}
.card p{color:var(--body);font-size:15.5px}
.card p:last-child{margin-bottom:0}
.card .kicker{font:650 11.5px/1.4 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--blue-ink);margin-bottom:8px}

/* Model hub */
.hub{display:grid;grid-template-columns:1fr 1.1fr 1fr;grid-template-areas:"a core b" "c core d";gap:16px;margin-top:34px;align-items:stretch}
.hub .core{grid-area:core;display:flex;flex-direction:column;justify-content:center;background:linear-gradient(160deg,#1f3fc4,#5b3fd8);color:#fff;border-radius:18px;padding:26px;box-shadow:0 24px 50px -30px #3a2fb0}
.hub .core h3{font-size:24px;margin-bottom:10px}
.hub .core p{color:#e7eaff;font-size:15.5px}
.hub .core .lang{display:grid;gap:10px;margin-top:8px}
.hub .core .lang div{background:#ffffff1a;border:1px solid #ffffff33;border-radius:10px;padding:10px 12px;font-size:14.5px;color:#fff}
.hub .core .lang strong{font-family:var(--mono);font-size:13px;letter-spacing:.04em}
.hub .a{grid-area:a}.hub .b{grid-area:b}.hub .c{grid-area:c}.hub .d{grid-area:d}
.hub .card{position:relative}
.hub .card .example{font-size:14px;color:var(--muted);border-top:1px dashed var(--line);padding-top:10px;margin-top:10px}

.checks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:22px}
.checks .card h3{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.checks ul{margin:6px 0 0;padding-left:20px;color:var(--body);font-size:15px}
.checks li{margin-bottom:6px}

/* Roles */
.roles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;border:1px solid var(--line);border-radius:var(--radius);background:#fff;margin-top:28px;overflow:hidden}
.roles>div{padding:22px}
.roles>div+div{border-left:1px solid var(--line)}
.roles h3{font-size:17px;margin-bottom:6px}
.roles p{margin:0;color:var(--body);font-size:15px}

/* Status table */
.status{width:100%;border-collapse:collapse;margin-top:26px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;font-size:15px}
.status th,.status td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
.status th{font:650 12px/1.4 var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:#f8faff}
.status tr:last-child td{border-bottom:0}
.status td:first-child{font-weight:650;width:30%}
.status td p{margin:0;color:var(--body)}

/* Walkthrough steps */
.walk{list-style:none;margin:36px 0 0;padding:0;counter-reset:step;display:grid;gap:22px}
.walk>li{counter-increment:step;background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px 26px 22px;position:relative}
.walk>li>h3{display:flex;gap:14px;align-items:baseline;font-size:23px;margin-bottom:6px}
.walk>li>h3:before{content:counter(step);flex:none;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(140deg,var(--blue),var(--violet));color:#fff;font:700 16px/1 var(--display);transform:translateY(-3px)}
.walk .step-lede{color:var(--body);max-width:70ch;margin:0 0 16px 48px}
.triple{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.triple>div{background:var(--wash);border:1px solid var(--line);border-radius:12px;padding:14px 15px;font-size:15px;color:var(--body)}
.triple>div p:last-child{margin:0}
.triple .label{font:650 11px/1.3 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--blue-ink);margin-bottom:6px}
.triple>div:nth-child(2){background:#f5f3ff;border-color:#ddd5ff}
.triple>div:nth-child(2) .label{color:#4b2fb8}

/* Artifacts */
.artifact{margin:16px 0 0;border:1px solid #1f2740;border-radius:12px;overflow:hidden;background:#0f1424}
.artifact .bar{display:flex;justify-content:space-between;gap:8px 14px;flex-wrap:wrap;padding:9px 14px;background:#1a2136;color:#aeb8d6;font:600 11.5px/1.4 var(--mono)}
.artifact pre{margin:0;padding:14px 16px;overflow-x:auto;color:#e6ebff;font:13.5px/1.6 var(--mono);white-space:pre-wrap;overflow-wrap:anywhere}
.artifact .k{color:#9db4ff}.artifact .s{color:#ffd59a}.artifact .c{color:#7d88a8}.artifact .g{color:#7fe0b0}.artifact .r{color:#ff9d9d}
.attrib{font-size:13px;color:var(--muted);margin-top:8px}
.attrib a{color:var(--blue-ink)}

.callout{border:1px solid #c9d4f3;background:#f5f8ff;border-radius:14px;padding:18px 20px;margin-top:22px}
.callout h3{font-size:18px;margin-bottom:6px}
.callout p{color:var(--body);font-size:15.5px}
.callout p:last-child{margin:0}
.callout.amber{border-color:var(--amber-line);background:var(--amber)}
.callout.amber p{color:#46370f}

/* Diagram figure */
.diagram{margin:26px 0 0;background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden}
.diagram .scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.diagram .scroll img{width:100%;min-width:0}
.diagram figcaption{padding:14px 18px;border-top:1px solid var(--line);font-size:14px;color:var(--body);background:#fbfcfe}
.diagram figcaption p{margin:0 0 6px}
.diagram figcaption p:last-child{margin:0}
.scroll-hint{display:none}

/* Boundary scenarios */
.boundary{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:24px}
.scenario{border-radius:14px;padding:20px;border:1px solid var(--line);background:#fff}
.scenario.inside{border-top:5px solid #2a9d6b}
.scenario.outside{border-top:5px solid #c9772a}
.scenario h3{font-size:19px;margin:8px 0 10px}
.scenario dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:6px 12px;font-size:15px}
.scenario dt{font:650 12px/1.6 var(--mono);text-transform:uppercase;color:var(--muted)}
.scenario dd{margin:0;color:var(--body)}
.timeline-bar{margin-top:22px;position:relative;height:78px}
.timeline-bar .track{position:absolute;left:0;right:0;top:22px;height:10px;border-radius:999px;background:linear-gradient(90deg,#bfe7d3 0 78%,#f5d2ad 78% 100%)}
.timeline-bar .tick{position:absolute;top:0;transform:translateX(-50%);font:650 12px/1.2 var(--mono);color:var(--body);text-align:center;white-space:nowrap}
.timeline-bar .tick:after{content:"";display:block;width:2px;height:16px;background:currentColor;margin:4px auto 0}
.timeline-bar .tick.w{color:#1b1f2c;top:18px}
.timeline-bar .tick.w:after{display:none}
.timeline-bar .tick.w:before{content:"";display:block;width:2px;height:22px;background:currentColor;margin:0 auto 4px}

/* Contributed table */
.contrib{width:100%;border-collapse:collapse;margin-top:22px;font-size:15px;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.contrib th,.contrib td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.contrib th{background:#f8faff;font:650 12px/1.4 var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.contrib tr:last-child td{border-bottom:0}
.contrib td{color:var(--body)}

/* CTA band */
.cta{padding:64px 0;text-align:center}
.cta h2{margin-inline:auto}
.cta p{color:var(--body);max-width:56ch;margin:14px auto 24px}
.cta .actions{justify-content:center}

/* Updates page */
.contact-card{max-width:720px;background:#fff;border:1px solid #d6def0;border-radius:18px;padding:26px;box-shadow:0 22px 50px -40px #2c3fa3}
.address{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:16px 0 6px}
.address output,.address .addr{font:600 18px/1.3 var(--mono);background:var(--wash);border:1px solid var(--line);border-radius:10px;padding:10px 14px;user-select:all;overflow-wrap:anywhere}
.copy-status{min-height:1.4em;font-size:14px;color:var(--green-ink);margin:4px 0 0}
.next-steps{counter-reset:n;list-style:none;padding:0;margin:18px 0 0;display:grid;gap:12px}
.next-steps li{counter-increment:n;display:grid;grid-template-columns:30px 1fr;gap:12px;color:var(--body);font-size:15.5px}
.next-steps li:before{content:counter(n);width:28px;height:28px;border-radius:50%;background:var(--grey-chip);display:grid;place-items:center;font:700 14px/1 var(--display);color:var(--blue-ink)}

/* Footer */
footer.site{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font-size:14px}
footer.site .wrap{display:flex;justify-content:space-between;gap:12px 18px;flex-wrap:wrap}
footer.site nav{display:flex;flex-wrap:wrap;gap:8px 18px}
footer.site a{text-decoration:none}
footer.site a:hover{text-decoration:underline}

@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:36px;padding:52px 0}
  .hub{grid-template-columns:1fr 1fr;grid-template-areas:"core core" "a b" "c d"}
  .triple{grid-template-columns:1fr}
  .walk .step-lede{margin-left:0}
}
@media (max-width:760px){
  .wrap{width:calc(100% - 32px)}
  .band{padding:52px 0}
  .grid-2,.grid-3,.checks,.boundary{grid-template-columns:1fr}
  .roles{grid-template-columns:1fr}
  .roles>div+div{border-left:0;border-top:1px solid var(--line)}
  .hub{grid-template-columns:1fr;grid-template-areas:"core" "a" "b" "c" "d"}
  .status td:first-child{width:auto}
  .status thead{display:none}
  .status tr{display:block;border-bottom:1px solid var(--line)}
  .status td{display:block;border:0;padding:8px 16px}
  .status td:first-child{padding-top:16px}
  .status td:last-child{padding-bottom:16px}
  .diagram .scroll img,.proof .scroll img{min-width:760px}
  .scroll-hint{display:block;font-size:13px;color:var(--muted);padding:8px 18px 0}
  .walk>li{padding:20px 18px 18px}
  .artifact pre{font-size:12.5px;padding:12px}
  .walk>li>h3{font-size:20px}
  .lede{font-size:17px}
  .contrib thead{display:none}
  .contrib tr{display:block;border-bottom:1px solid var(--line)}
  .contrib td{display:block;border:0;padding:6px 14px}
  .contrib td:first-child{padding-top:14px;font-weight:650;color:var(--ink)}
  .contrib td:last-child{padding-bottom:14px}
}
@media (max-width:520px){
  .hide-sm{display:none}
  .hero-grid{padding-top:28px}
  .hero.inner .hero-grid{padding-top:32px}
  .brand small{display:none}
  header.site nav{gap:10px}
  .links{gap:6px 16px;font-size:14.5px}
  .links .button{padding:8px 12px}
  .actions .button{width:100%;justify-content:center}
  .proof .diagram-link{padding:6px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.timeline-bar .tick.start:after{margin-left:0}