/* Layout: one long page of sections under a sticky nav; a schematic of the real node grid opens it, docs sit in tabs */
:root{
  --bg:#F2F4F6; --surface:#FFFFFF; --ink:#0F1C2B; --muted:#56657A; --line:#D4DCE5;
  --accent:#1D4ED8; --accent-soft:#E3EAFB; --copper:#B4602A; --copper-soft:#F5E6DA; --code:#0F1C2B; --code-ink:#DCE5F0;
  --display:"IBM Plex Sans","Segoe UI",system-ui,sans-serif;
  --body:"IBM Plex Sans","Segoe UI",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Consolas,monospace;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0C131D; --surface:#121C29; --ink:#E6ECF3; --muted:#93A2B5; --line:#24324A;
  --accent:#7EA2FF; --accent-soft:#18264A; --copper:#E39A66; --copper-soft:#33231A; --code:#070C13; --code-ink:#DCE5F0; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0C131D; --surface:#121C29; --ink:#E6ECF3; --muted:#93A2B5; --line:#24324A;
  --accent:#7EA2FF; --accent-soft:#18264A; --copper:#E39A66; --copper-soft:#33231A; --code:#070C13; --code-ink:#DCE5F0; color-scheme:dark}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.6;margin:0;font-synthesis:none;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
b,strong{font-weight:600}
.wrap{max-width:1120px;margin:0 auto;padding-inline:clamp(16px,4vw,40px)}
a{color:var(--accent)}
a:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
h1,h2,h3{font-family:var(--display);text-wrap:balance;line-height:1.15;margin:0;letter-spacing:-.015em}
h2{font-size:clamp(1.5rem,3vw,2rem);font-weight:700}
h3{font-size:1.1rem;font-weight:600}
p{margin:0}
.eyebrow{font-family:var(--mono);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.muted{color:var(--muted)}

/* header */
header{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:24px;padding-block:14px}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--display);font-weight:700;font-size:1.1rem;color:var(--ink);text-decoration:none;flex:none}
.logo-mark{display:grid;grid-template-columns:repeat(3,6px);gap:2px}
.logo-mark i{width:6px;height:6px;background:var(--accent);border-radius:1px}
.logo-mark i:nth-child(5){background:var(--copper)}
nav{display:flex;gap:18px;margin-left:auto;flex-wrap:wrap}
nav a{color:var(--muted);text-decoration:none;font-size:.9rem;font-weight:500}
nav a:hover{color:var(--ink)}
.langs{display:flex;border:1px solid var(--line);border-radius:999px;padding:2px;flex:none}
.langs button{font:500 .78rem var(--mono);letter-spacing:.04em;background:none;border:0;color:var(--muted);padding:5px 10px;border-radius:999px;cursor:pointer}
.langs button[aria-pressed="true"]{background:var(--ink);color:var(--bg)}
@media (max-width:900px){nav{display:none}.langs{margin-left:auto}}

/* hero */
.hero{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:clamp(32px,5vw,64px);align-items:center;padding-block:clamp(48px,8vw,96px) clamp(40px,6vw,72px)}
.hero h1{font-size:clamp(2.4rem,5.6vw,4.2rem);font-weight:700;margin-block:14px 20px;letter-spacing:-.025em}
.hero h1 span{color:var(--accent)}
.lead{font-size:1.15rem;color:var(--muted);max-width:34em}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:.95rem;padding:12px 20px;border-radius:8px;text-decoration:none;border:1px solid transparent}
.btn-main{background:var(--accent);color:#fff}
:root[data-theme="dark"] .btn-main{color:#0C131D}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .btn-main{color:#0C131D}}
.btn-ghost{border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink)}
@media (max-width:860px){.hero{grid-template-columns:1fr}}

/* node schematic */
.rack{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:20px;display:grid;gap:20px}
.cluster{display:grid;gap:10px}
.cluster-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.cluster-head b{font-family:var(--display);font-weight:600;font-size:1rem}
.cluster-head span{font:400 .75rem var(--mono);color:var(--muted)}
.nodes{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:6px}
.node{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;padding:4px;border:1px solid var(--line);border-radius:4px}
.node i{aspect-ratio:1;max-width:100%;background:var(--accent);opacity:.85;border-radius:1px}
.cluster.abinit .node i{background:var(--copper)}
.node-label{font:400 .62rem var(--mono);color:var(--muted);text-align:center;margin-top:3px}
.rack-note{font:400 .75rem var(--mono);color:var(--muted);border-top:1px dashed var(--line);padding-top:12px}
@media (prefers-reduced-motion:no-preference){
  .node i{animation:pulse 3.2s ease-in-out infinite;animation-delay:calc(var(--d)*1ms)}
  @keyframes pulse{0%,100%{opacity:.85}50%{opacity:.45}}
}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-block:1px solid var(--line)}
.stat{padding:24px 20px;border-left:1px solid var(--line)}
.stat:first-child{border-left:0;padding-left:0}
.stat b{display:block;font-family:var(--display);font-size:clamp(1.6rem,3vw,2.2rem);font-weight:700;font-variant-numeric:tabular-nums}
.stat span{color:var(--muted);font-size:.9rem}
@media (max-width:640px){.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.stat:nth-child(3){border-left:0;padding-left:0}.stat:nth-child(n+3){border-top:1px solid var(--line)}}

section{padding-block:clamp(56px,8vw,96px) 0}
section:last-of-type{padding-bottom:clamp(56px,8vw,96px)}
.sec-head{display:grid;gap:10px;margin-bottom:36px;max-width:42em}
.sec-head p{color:var(--muted)}

/* about */
.about{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:clamp(28px,5vw,64px);align-items:start}
.about-text{display:grid;gap:16px;font-size:1.05rem}
.facts{list-style:none;margin:0;padding:0;display:grid;gap:0;border-top:1px solid var(--line)}
.facts li{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;padding:14px 0;border-bottom:1px solid var(--line)}
.facts li span{color:var(--muted)}
.facts li b{font-family:var(--mono);font-weight:500;text-align:right}
@media (max-width:760px){.about{grid-template-columns:1fr}}

/* table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:640px;font-size:.95rem}
th,td{text-align:left;padding:14px 18px;border-bottom:1px solid var(--line);vertical-align:top}
th{font:500 .74rem var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:var(--bg)}
tr:last-child td{border-bottom:0}
.tag{display:inline-block;font:500 .72rem var(--mono);padding:2px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);margin:2px 4px 2px 0}
.tag.cu{background:var(--copper-soft);color:var(--copper)}
td.num{font-variant-numeric:tabular-nums;font-family:var(--mono)}
td code,.rules code,p code{font-family:var(--mono);font-size:.88em;background:var(--accent-soft);color:var(--ink);padding:1px 6px;border-radius:4px}
.foot-note{color:var(--muted);font-size:.9rem;margin-top:14px}

/* infrastructure */
.infra{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:28px}
.box{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:24px;display:grid;gap:10px;align-content:start}
.box .code{font:500 .76rem var(--mono);color:var(--copper);letter-spacing:.04em}
.box p{color:var(--muted);font-size:.95rem}
.box.wide{grid-column:span 2}
.box.plan{border-style:dashed}
.tags{display:flex;flex-wrap:wrap}
@media (max-width:860px){.infra{grid-template-columns:1fr}.box.wide{grid-column:auto}}

/* services */
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.cell{background:var(--surface);padding:28px;display:grid;gap:10px;align-content:start}
.cell .code{font:500 .78rem var(--mono);color:var(--copper)}
.cell p{color:var(--muted)}
@media (max-width:700px){.grid{grid-template-columns:1fr}}

/* research */
.topics{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:28px}
.topic{display:grid;gap:8px;border-top:2px solid var(--ink);padding-top:16px}
.topic p{color:var(--muted);font-size:.95rem}

/* docs */
.tabs{display:flex;gap:4px;flex-wrap:wrap;border-bottom:1px solid var(--line);margin-bottom:28px}
.tabs button{font:500 .92rem var(--body);background:none;border:0;border-bottom:2px solid transparent;color:var(--muted);padding:10px 14px;cursor:pointer;margin-bottom:-1px}
.tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--accent)}
.panel{display:grid;gap:20px}
.os{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
@media (max-width:760px){.os{grid-template-columns:1fr}}
.os .box ol{margin:0;padding-left:20px;color:var(--muted);display:grid;gap:6px;font-size:.95rem}
.code-block{position:relative;background:var(--code);color:var(--code-ink);border-radius:12px;overflow:hidden}
.code-block pre{margin:0;padding:20px;overflow-x:auto;font:400 .85rem/1.6 var(--mono)}
.code-block .copy{position:absolute;top:10px;right:10px;font:500 .72rem var(--mono);background:rgba(255,255,255,.08);color:var(--code-ink);border:1px solid rgba(255,255,255,.16);border-radius:6px;padding:5px 10px;cursor:pointer}
.code-block .copy:hover{background:rgba(255,255,255,.16)}
.rules{margin:0;padding:0;list-style:none;display:grid;gap:0;border-top:1px solid var(--line)}
.rules li{display:grid;grid-template-columns:28px minmax(0,1fr);gap:12px;padding:16px 0;border-bottom:1px solid var(--line)}
.rules li::before{content:"";width:10px;height:10px;margin-top:8px;border-radius:2px;background:var(--copper)}
.rules li b{display:block;font-weight:600}
.rules li span{color:var(--muted);font-size:.95rem}

/* access steps */
.steps{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;counter-reset:s}
.steps li{counter-increment:s;display:grid;gap:8px;align-content:start}
.steps li::before{content:counter(s);font-family:var(--display);font-weight:700;font-size:1.1rem;width:40px;height:40px;display:grid;place-items:center;border-radius:50%;background:var(--accent-soft);color:var(--accent)}
.steps p{color:var(--muted);font-size:.95rem}
@media (max-width:760px){.steps{grid-template-columns:1fr}}

/* collaboration */
.collab{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:clamp(24px,4vw,48px);background:var(--accent-soft);border-radius:12px;padding:clamp(24px,4vw,44px)}
.offer{list-style:none;margin:0;padding:0;display:grid;gap:16px}
.offer li{display:grid;gap:4px;padding-left:16px;border-left:2px solid var(--accent)}
.offer li span{color:var(--muted);font-size:.95rem}
@media (max-width:760px){.collab{grid-template-columns:1fr}}

/* news */
.news{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.news li{display:grid;grid-template-columns:150px minmax(0,1fr);gap:24px;padding:22px 0;border-bottom:1px solid var(--line)}
.news time{font:500 .82rem var(--mono);color:var(--copper);padding-top:2px}
.news h3{margin-bottom:6px}
.news p{color:var(--muted);font-size:.95rem;max-width:62ch}
@media (max-width:600px){.news li{grid-template-columns:1fr;gap:6px}}

/* cite */
.cite{display:grid;gap:16px;margin-top:36px}
.cite blockquote{margin:0;font-size:1.05rem;padding:20px 24px;background:var(--surface);border:1px solid var(--line);border-radius:12px;display:grid;gap:12px}
.cite blockquote p{max-width:70ch}
.cite .row{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.btn-sm{font:500 .78rem var(--mono);background:none;border:1px solid var(--line);color:var(--ink);border-radius:6px;padding:6px 12px;cursor:pointer}
.btn-sm:hover{border-color:var(--ink)}

/* contact */
.contact{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:clamp(24px,4vw,40px)}
.contact dl{margin:0;display:grid;gap:18px}
.contact dt{font:500 .74rem var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.contact dd{margin:4px 0 0;font-size:1.05rem}
@media (max-width:700px){.contact{grid-template-columns:1fr}}

footer{border-top:1px solid var(--line);padding-block:28px;color:var(--muted);font-size:.85rem}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

/* multi-page additions */
.page-head{padding-block:clamp(40px,6vw,72px) 0;display:grid;gap:10px}
.page-head h1{font-size:clamp(2rem,4.6vw,3.2rem);font-weight:700;letter-spacing:-.01em}
.page-head + section{padding-top:clamp(28px,4vw,48px)}
nav a[aria-current="page"]{color:var(--ink);box-shadow:inset 0 -2px 0 var(--accent)}
.menu-btn{display:none;font:500 .85rem var(--body);background:none;border:1px solid var(--line);color:var(--ink);border-radius:8px;padding:6px 12px;cursor:pointer;flex:none}
@media (max-width:900px){
  .menu-btn{display:inline-flex}
  .langs{margin-left:auto}
  header nav{position:absolute;left:0;right:0;top:100%;flex-direction:column;gap:0;background:var(--bg);border-bottom:1px solid var(--line);padding:8px clamp(16px,4vw,40px) 16px}
  header nav.open{display:flex}
  header nav a{padding:10px 0;border-bottom:1px solid var(--line)}
  header nav a[aria-current="page"]{box-shadow:none;color:var(--accent)}
}
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:24px;display:grid;gap:10px;align-content:start;text-decoration:none;color:var(--ink);transition:border-color .15s}
.card:hover{border-color:var(--accent)}
.card .code{font:500 .76rem var(--mono);color:var(--copper);letter-spacing:.04em}
.card p{color:var(--muted);font-size:.95rem}
.card .more{font-weight:600;font-size:.9rem;color:var(--accent)}
@media (max-width:860px){.cards{grid-template-columns:1fr}}
.foot-nav{display:flex;gap:16px;flex-wrap:wrap}
.foot-nav a{color:var(--muted);text-decoration:none}
.foot-nav a:hover{color:var(--ink)}
.see-all{margin-top:20px}