/* Rain Chain — site styles. Brand: INK #212121, ACID #E6FF00, GREY #7A7A7A, LINE #DAD9D9, SOFT #F4F4F2 */
:root{
  --ink:#212121;--ink2:#181818;--ink3:#2b2b2b;--acid:#E6FF00;--grey:#7A7A7A;--line:#DAD9D9;--soft:#F4F4F2;
  --dline:#3a3a3a;--dtext:#cfcfcf;--muted:#5e5e5e;
  --f:"Helvetica Now","Helvetica Neue",Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --w:1200px;--r:4px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--f);color:var(--ink);background:#fff;font-size:17px;line-height:1.55;text-rendering:optimizeLegibility}
img,svg{max-width:100%;height:auto;display:block}
a{color:inherit}
a:focus-visible,button:focus-visible{outline:3px solid var(--acid);outline-offset:2px;box-shadow:0 0 0 5px var(--ink)}
.skip{position:absolute;left:-9999px;top:0;background:var(--acid);color:var(--ink);padding:10px 16px;z-index:100;font-weight:700}
.skip:focus{left:12px;top:12px}
.wrap{max-width:var(--w);margin:0 auto;padding:0 28px}
h1,h2,h3,h4{letter-spacing:-.02em;line-height:1.08;margin:0 0 .5em;font-weight:700}
h1{font-size:clamp(40px,6.4vw,84px);font-weight:800;letter-spacing:-.035em}
h2{font-size:clamp(30px,3.8vw,48px)}
h3{font-size:22px;letter-spacing:-.01em}
h4{font-size:17px}
p{margin:0 0 1em}
.lead{font-size:clamp(18px,1.6vw,22px);font-weight:300;color:var(--muted);max-width:760px}
.dark .lead{color:var(--dtext)}
.eyebrow{font-size:13px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--grey);margin:0 0 18px;display:flex;align-items:center;gap:10px}
.eyebrow::before{content:"";width:22px;height:3px;background:var(--acid);display:inline-block}
.dark .eyebrow{color:#a8a8a8}
.hl{background:linear-gradient(transparent 62%,var(--acid) 62%,var(--acid) 92%,transparent 92%);padding:0 .06em}
.dark .hl{background:none;color:var(--acid)}
code,.mono{font-family:var(--mono);font-size:.88em}
p code,li code,td code{background:var(--soft);padding:1px 6px;border-radius:3px}
.dark p code,.dark li code{background:var(--ink3);color:#eee}

/* header */
.top{position:sticky;top:0;z-index:50;background:rgba(33,33,33,.97);color:#fff;border-bottom:1px solid #333;}
.top .wrap{display:flex;align-items:center;gap:28px;height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;font-size:20px;letter-spacing:-.02em;white-space:nowrap}
.brand svg,.brand img{width:30px;height:30px;border-radius:7px;display:block}
.brand span b{color:var(--acid);font-weight:800}
.nav{display:flex;gap:4px;margin-left:auto;align-items:center}
.nav a{text-decoration:none;color:#d9d9d9;font-size:15px;padding:8px 12px;border-radius:var(--r);font-weight:500}
.nav a:hover{color:#fff;background:#2e2e2e}
.nav a[aria-current=page]{color:var(--ink);background:var(--acid)}
.nav .btn{margin-left:8px}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid #555;color:#fff;border-radius:var(--r);height:40px;width:44px;cursor:pointer;align-items:center;justify-content:center}
.menu-btn span,.menu-btn span::before,.menu-btn span::after{display:block;width:18px;height:2px;background:#fff;position:relative;content:"";transition:.2s}
.menu-btn span::before{position:absolute;top:-6px}.menu-btn span::after{position:absolute;top:6px}
.menu-btn[aria-expanded=true] span{background:transparent}
.menu-btn[aria-expanded=true] span::before{top:0;transform:rotate(45deg)}
.menu-btn[aria-expanded=true] span::after{top:0;transform:rotate(-45deg)}
.status{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;border:1px solid #4a4a4a;border-radius:99px;padding:5px 12px 5px 10px;color:#e8e8e8;white-space:nowrap;text-decoration:none}
.status i{width:8px;height:8px;border-radius:50%;background:var(--acid);box-shadow:0 0 0 0 rgba(230,255,0,.6);animation:pulse 2.2s infinite}
.light .status{border-color:var(--line);color:var(--ink)}
.light .status i{background:var(--ink);animation:none}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(230,255,0,.55)}70%{box-shadow:0 0 0 9px rgba(230,255,0,0)}100%{box-shadow:0 0 0 0 rgba(230,255,0,0)}}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-weight:700;font-size:15px;padding:12px 20px;border-radius:var(--r);border:2px solid var(--ink);background:var(--ink);color:#fff;transition:transform .15s,background .15s;white-space:nowrap}
.btn:hover{transform:translateY(-1px)}
.btn.acid{background:var(--acid);border-color:var(--acid);color:var(--ink)}
.btn.ghost{background:transparent;color:var(--ink)}
.dark .btn.ghost,.top .btn.ghost{color:#fff;border-color:#6a6a6a}
.btn.sm{padding:8px 14px;font-size:14px}
.btn .arr{transition:transform .15s}.btn:hover .arr{transform:translateX(3px)}
.ctas{display:flex;gap:12px;flex-wrap:wrap;margin-top:32px}

/* sections */
section{padding:96px 0}
.dark{background:var(--ink);color:#fff}
.darker{background:var(--ink2);color:#fff}
.soft{background:var(--soft)}
.sec-head{max-width:820px;margin-bottom:52px}
.hero{padding:96px 0 88px;position:relative;overflow:hidden}
.hero h1{max-width:980px}
.hero .grid-bg{position:absolute;inset:0;background-image:linear-gradient(#2c2c2c 1px,transparent 1px),linear-gradient(90deg,#2c2c2c 1px,transparent 1px);background-size:56px 56px;mask-image:radial-gradient(ellipse at 70% 30%,#000 10%,transparent 70%);-webkit-mask-image:radial-gradient(ellipse at 70% 30%,#000 10%,transparent 70%);opacity:.7;pointer-events:none}
.hero .wrap{position:relative}
.page-hero{padding:84px 0 72px}
.page-hero h1{font-size:clamp(38px,5.2vw,68px)}
.crumbs{font-size:14px;color:#a0a0a0;margin-bottom:22px}
.crumbs a{color:#a0a0a0}

/* grids & cards */
.g2,.g3,.g4{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{border:1px solid var(--line);border-radius:6px;padding:28px;background:#fff;position:relative}
.card h3{margin-bottom:10px}
.card p:last-child,.card ul:last-child{margin-bottom:0}
.card .k{font-family:var(--mono);font-size:12.5px;color:var(--grey);letter-spacing:.04em;display:block;margin-bottom:14px}
.dark .card,.darker .card{background:var(--ink3);border-color:var(--dline);color:#f0f0f0}
.dark .card p,.darker .card p{color:var(--dtext)}
.card.accent{border-top:4px solid var(--acid)}
.card .icon{width:44px;height:44px;border-radius:6px;background:var(--ink);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.dark .card .icon{background:var(--acid)}
.card .icon svg{width:24px;height:24px}
.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.split.top-al{align-items:start}
ul.ticks{list-style:none;padding:0;margin:0 0 1em}
ul.ticks li{padding-left:28px;position:relative;margin-bottom:10px}
ul.ticks li::before{content:"";position:absolute;left:0;top:.5em;width:14px;height:8px;border-left:3px solid var(--ink);border-bottom:3px solid var(--ink);transform:rotate(-45deg) translateY(-4px)}
.dark ul.ticks li::before,.darker ul.ticks li::before{border-color:var(--acid)}
ul.plain{padding-left:20px}ul.plain li{margin-bottom:8px}

/* numbers */
.nums{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--dline);border-left:1px solid var(--dline)}
.nums>div{padding:28px 24px;border-right:1px solid var(--dline);border-bottom:1px solid var(--dline)}
.nums b{display:block;font-size:clamp(34px,3.6vw,50px);font-weight:800;letter-spacing:-.03em;line-height:1;color:var(--acid);margin-bottom:10px}
.nums span{font-size:15px;color:var(--dtext);display:block}
.nums small{display:block;font-size:12px;color:#8d8d8d;margin-top:6px;text-transform:uppercase;letter-spacing:.06em}
.light-nums{border-color:var(--line)}
.light-nums>div{border-color:var(--line)}
.light-nums b{color:var(--ink)}
.light-nums span{color:var(--muted)}

/* tables */
.tbl{width:100%;overflow-x:auto;margin:8px 0 24px;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:6px}
table{width:100%;border-collapse:collapse;font-size:15px;min-width:520px}
th{background:var(--ink);color:#fff;text-align:left;font-weight:700;padding:12px 16px;font-size:14px;white-space:nowrap}
td{padding:12px 16px;border-top:1px solid var(--line);vertical-align:top}
tr:nth-child(even) td{background:#fafaf8}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}
.dark .tbl{border-color:var(--dline)}
.dark th{background:#111}
.dark td{border-color:var(--dline)}
.dark tr:nth-child(even) td{background:#262626}
.tba{display:inline-block;font-family:var(--mono);font-size:12.5px;background:var(--soft);color:var(--muted);border:1px dashed #bdbdbd;border-radius:3px;padding:1px 8px}
.pill{display:inline-block;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;padding:3px 10px;border-radius:99px;background:var(--soft);border:1px solid var(--line);white-space:nowrap}
.pill.done{background:var(--acid);border-color:var(--acid)}
.pill.now{background:var(--ink);color:var(--acid);border-color:var(--ink)}

/* notes */
.note{border-left:4px solid var(--acid);background:var(--soft);padding:18px 22px;border-radius:0 6px 6px 0;margin:24px 0;font-size:15.5px}
.note b:first-child{display:block;margin-bottom:4px}
.dark .note{background:var(--ink3);color:var(--dtext)}
.note.warn{border-color:var(--ink)}

/* figures */
figure{margin:0}
figcaption{font-size:14px;color:var(--grey);margin-top:14px}
.fig{border:1px solid var(--line);border-radius:8px;padding:28px;background:#fff}
.dark .fig{background:var(--ink2);border-color:var(--dline)}

/* code */
pre{background:#161616;color:#e9e9e9;padding:22px 24px;border-radius:6px;overflow-x:auto;font-family:var(--mono);font-size:14px;line-height:1.6;margin:0 0 24px;border:1px solid #2f2f2f;position:relative}
pre .c{color:#8a8a8a}pre .s{color:var(--acid)}pre .k{color:#9ecbff}pre .n{color:#ffb86b}
.code-label{display:flex;justify-content:space-between;align-items:center;background:#0f0f0f;color:#bdbdbd;font-size:12.5px;font-family:var(--mono);padding:8px 16px;border-radius:6px 6px 0 0;border:1px solid #2f2f2f;border-bottom:0}
.code-label+pre{border-radius:0 0 6px 6px}
.code-label b{color:var(--acid);font-weight:600}

/* roadmap */
.road{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:3px solid var(--dline);position:relative}
.road>div{padding:28px 22px 4px 0;position:relative}
.road>div::before{content:"";position:absolute;top:-10px;left:0;width:17px;height:17px;border-radius:50%;background:var(--ink);border:3px solid #555}
.road>div.cur::before{background:var(--acid);border-color:var(--acid);box-shadow:0 0 0 6px rgba(230,255,0,.18)}
.road h4{font-size:19px;margin:10px 0 6px}
.road p{font-size:15px;color:var(--dtext);margin-bottom:8px}
.road .when{font-family:var(--mono);font-size:12.5px;color:#9a9a9a}
.light .road{border-color:var(--line)}
.light .road p{color:var(--muted)}
.light .road>div::before{background:#fff;border-color:var(--line)}
.light .road>div.cur::before{background:var(--acid);border-color:var(--ink)}

/* toc side layout */
.doc{display:grid;grid-template-columns:230px 1fr;gap:56px;align-items:start}
.toc{position:sticky;top:96px;font-size:14.5px;border-left:2px solid var(--line);padding-left:18px}
.toc b{display:block;font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:var(--grey);margin-bottom:10px}
.toc a{display:block;text-decoration:none;color:var(--muted);padding:5px 0}
.toc a:hover{color:var(--ink)}
.doc-body>section{padding:0 0 72px;scroll-margin-top:90px}
.doc-body>section+section{border-top:1px solid var(--line);padding-top:56px}
.doc-body h2{font-size:clamp(28px,3vw,38px)}
.doc-body h3{margin-top:30px}
.doc-body p,.doc-body li{max-width:780px}
.req{font-family:var(--mono);font-size:12px;color:var(--grey);border:1px solid var(--line);border-radius:3px;padding:1px 6px;margin-left:6px;white-space:nowrap;vertical-align:2px}

/* ordering animation */
.ord-anim .lane{opacity:0;animation:fadein .6s forwards}
.ord-anim .l1{animation-delay:.2s}.ord-anim .l2{animation-delay:1.0s}.ord-anim .l3{animation-delay:1.8s}
.ord-anim .exec{stroke-dasharray:900;stroke-dashoffset:900;animation:draw 2.4s .4s forwards ease-out}
@keyframes fadein{to{opacity:1}}
@keyframes draw{to{stroke-dashoffset:0}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}.ord-anim .lane{opacity:1}.ord-anim .exec{stroke-dashoffset:0}}

/* bar chart */
.bars{display:grid;grid-template-columns:repeat(10,1fr);gap:10px;align-items:end;height:260px;border-bottom:2px solid var(--ink);padding-top:28px}
.bars .b{position:relative;display:flex;flex-direction:column;justify-content:flex-end;height:100%}
.bars .b i{display:block;background:var(--ink);border-radius:3px 3px 0 0;position:relative}
.bars .b i.inf{background:var(--acid);border:1px solid #c7dc00;border-radius:0}
.bars .b em{position:absolute;top:-24px;left:0;right:0;text-align:center;font-style:normal;font-size:12.5px;font-weight:700}
.bars-x{display:grid;grid-template-columns:repeat(10,1fr);gap:10px;font-size:13px;color:var(--grey);text-align:center;margin-top:8px}
.legend{display:flex;gap:22px;flex-wrap:wrap;font-size:14px;color:var(--muted);margin-top:18px}
.legend i{display:inline-block;width:14px;height:14px;vertical-align:-2px;margin-right:7px;border-radius:2px}

/* split bar */
.splitbar{display:flex;height:58px;border-radius:6px;overflow:hidden;font-weight:700;font-size:15px}
.splitbar>div{display:flex;align-items:center;justify-content:center;padding:0 8px;text-align:center;line-height:1.15}

/* waterfall */
.steps{counter-reset:s;display:grid;gap:14px}
.steps>div{counter-increment:s;display:grid;grid-template-columns:60px 1fr;gap:20px;border:1px solid var(--line);border-radius:6px;padding:20px 22px;background:#fff;align-items:start}
.steps>div::before{content:counter(s);font-size:30px;font-weight:800;width:52px;height:52px;border-radius:6px;background:var(--ink);color:var(--acid);display:flex;align-items:center;justify-content:center}
.steps h4{margin:2px 0 6px}
.steps p{margin:0;color:var(--muted);font-size:15.5px}

/* cta */
.cta{background:var(--acid);color:var(--ink);padding:80px 0}
.cta .wrap{display:flex;justify-content:space-between;align-items:center;gap:32px;flex-wrap:wrap}
.cta h2{margin:0;max-width:720px}
.cta p{margin:10px 0 0;font-size:18px}

/* footer */
footer.foot{background:var(--ink2);color:#bdbdbd;padding:64px 0 32px;font-size:15px}
.foot .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
.foot h4{color:#fff;font-size:13px;text-transform:uppercase;letter-spacing:.12em;margin-bottom:14px}
.foot a{color:#bdbdbd;text-decoration:none;display:block;padding:4px 0}
.foot a:hover{color:var(--acid)}
.foot .brand{color:#fff;margin-bottom:16px}
.foot .legal{border-top:1px solid #333;margin-top:48px;padding-top:24px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:13.5px;color:#8f8f8f}
.foot .status{margin-top:8px}

/* responsive */
@media (max-width:1080px){
  .g4{grid-template-columns:repeat(2,1fr)}
  .nums{grid-template-columns:repeat(2,1fr)}
  .nav a{padding:8px 9px;font-size:14.5px}
  .top .status{display:none}
}
@media (max-width:920px){
  .menu-btn{display:inline-flex}
  .nav{position:fixed;top:68px;left:0;right:0;bottom:0;background:var(--ink);flex-direction:column;align-items:stretch;padding:20px 24px;gap:2px;display:none;overflow-y:auto}
  .nav.open{display:flex}
  .nav a{font-size:19px;padding:14px 12px;border-bottom:1px solid #333;border-radius:0}
  .nav .btn{margin:18px 0 0;justify-content:center;border-bottom:2px solid var(--acid);border-radius:var(--r)}
  .g3,.split,.doc{grid-template-columns:1fr}
  .split{gap:40px}
  .toc{position:static;display:none}
  .road{grid-template-columns:1fr 1fr;row-gap:28px}
  .foot .cols{grid-template-columns:1fr 1fr}
}
@media (max-width:600px){
  body{font-size:16px}
  .wrap{padding:0 20px}
  section{padding:68px 0}
  .hero{padding:64px 0 60px}
  .page-hero{padding:56px 0 48px}
  .g2,.g4,.road{grid-template-columns:1fr}
  .nums{grid-template-columns:1fr 1fr}
  .nums>div{padding:20px 16px}
  .card{padding:22px}
  .fig{padding:14px}
  .cta{padding:60px 0}
  .bars{gap:5px;height:220px}.bars-x{gap:5px;font-size:11px}
  .bars .b em{font-size:10px;top:-20px}
  .steps>div{grid-template-columns:44px 1fr;gap:14px;padding:16px}
  .steps>div::before{width:40px;height:40px;font-size:22px}
  .splitbar{height:auto;flex-wrap:wrap}.splitbar>div{padding:12px 8px}
  .foot .cols{grid-template-columns:1fr}
  .brand{font-size:18px}
  .btn{padding:11px 16px}
}
/* grid children must be allowed to shrink (wide tables scroll inside .tbl) */
.doc>*,.split>*,.g2>*,.g3>*,.g4>*,.doc-body>section{min-width:0}
pre{max-width:100%}
@media (max-width:600px){.splitbar>div{width:50%!important;min-height:52px}}