/* Layout: dark security-console / observatory. One bold element — the interactive Nexus map.
     Everything else quiet. Left-aligned editorial type over a faint radar field. */
  :root{
    /* Core palette — the Arc identity (pinned by the brand logo) */
    --ground:#070f16;        /* deepest navy-black */
    --surface:#0b1623;       /* panels */
    --surface-2:#102030;     /* raised panels */
    --line:#1d3141;          /* hairlines, navy-biased */
    --line-soft:#152636;
    --fg:#e8f0f7;            /* primary text */
    --muted:#8ba2b8;         /* secondary text, navy-grey */
    --faint:#5c7488;         /* captions, meta */
    --accent:#00d4ff;        /* Nexus cyan */
    --accent-deep:#0a6f99;
    /* Module signal hues */
    --edr:#00d4ff;
    --strike:#ff4560;
    --pulse:#ffb020;
    --compliance:#00c06f;
    color-scheme:dark;

    --maxw:1140px;
    --r:14px;
    --r-sm:10px;
    --step--1:clamp(.8rem,.76rem + .2vw,.9rem);
    --step-0:clamp(1rem,.95rem + .25vw,1.12rem);
    --step-1:clamp(1.2rem,1.1rem + .5vw,1.5rem);
    --step-2:clamp(1.6rem,1.35rem + 1.2vw,2.4rem);
    --step-3:clamp(2.2rem,1.7rem + 2.5vw,4rem);
    --ff-display:"Archivo","Archivo Expanded",system-ui,sans-serif;
    --ff-body:"IBM Plex Sans",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
    --ff-mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
  }

  *{box-sizing:border-box}
  body{
    margin:0;background:var(--ground);color:var(--fg);
    font-family:var(--ff-body);font-size:var(--step-0);line-height:1.6;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
    background-image:
      radial-gradient(1100px 620px at 78% -8%, rgba(0,212,255,.10), transparent 60%),
      radial-gradient(900px 520px at 12% 4%, rgba(0,192,111,.06), transparent 55%);
    background-attachment:fixed;
  }
  h1,h2,h3{font-family:var(--ff-display);font-weight:800;line-height:1.05;letter-spacing:-.02em;text-wrap:balance;margin:0}
  p{margin:0}
  a{color:inherit;text-decoration:none}
  :focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}

  .wrap{width:100%;max-width:var(--maxw);margin-inline:auto;
    padding-left:max(20px,env(safe-area-inset-left,0px));
    padding-right:max(20px,env(safe-area-inset-right,0px));}

  /* ---------- header ---------- */
  .site-head{position:sticky;top:env(safe-area-inset-top,0px);z-index:40;
    background:rgba(7,15,22,.78);backdrop-filter:blur(12px);
    border-bottom:1px solid var(--line-soft);}
  body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:41;background:rgba(7,15,22,.9)}
  .nav{display:flex;align-items:center;gap:24px;min-height:66px}
  .brand{display:flex;align-items:center;gap:11px;font-family:var(--ff-display);font-weight:800;font-size:1.18rem;letter-spacing:-.02em}
  .brand svg{width:34px;height:34px;flex:0 0 auto}
  .brand b{color:var(--fg)}.brand span{color:var(--accent)}
  .nav-links{display:flex;gap:22px;margin-left:auto;align-items:center}
  .nav-links a{color:var(--muted);font-size:var(--step--1);font-weight:500;transition:color .15s}
  .nav-links a:hover{color:var(--fg)}
  .btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--ff-body);font-weight:600;
    font-size:var(--step--1);padding:10px 18px;border-radius:999px;border:1px solid transparent;cursor:pointer;transition:.18s}
  .btn-primary{background:var(--accent);color:#04202b;box-shadow:0 0 0 1px rgba(0,212,255,.3),0 10px 30px -12px rgba(0,212,255,.55)}
  .btn-primary:hover{background:#4fe2ff;transform:translateY(-1px)}
  .btn-ghost{border-color:var(--line);color:var(--fg);background:rgba(255,255,255,.02)}
  .btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
  .nav-cta{margin-left:4px}
  .menu-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);color:var(--fg);
    border-radius:9px;width:42px;height:38px;cursor:pointer;font-size:1.1rem}

  /* ---------- hero ---------- */
  .hero{padding-block:clamp(48px,6vw,88px) clamp(40px,5vw,72px);position:relative}
  .hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,520px);gap:clamp(32px,5vw,64px);align-items:center}
  .kicker{display:inline-flex;align-items:center;gap:9px;font-family:var(--ff-mono);font-size:.74rem;
    letter-spacing:.06em;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:5px 13px;margin-bottom:22px}
  .kicker .dot{width:7px;height:7px;border-radius:50%;background:var(--compliance);box-shadow:0 0 10px var(--compliance)}
  .hero h1{font-size:var(--step-3)}
  .hero h1 em{font-style:normal;color:var(--accent)}
  .hero .lead{color:var(--muted);font-size:var(--step-1);margin-top:20px;max-width:34ch;line-height:1.4}
  .hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
  .hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
  .tag{display:inline-flex;align-items:center;gap:8px;font-family:var(--ff-mono);font-size:.76rem;
    color:var(--muted);border:1px solid var(--line);border-radius:8px;padding:6px 11px}
  .tag i{width:8px;height:8px;border-radius:2px;display:inline-block}

  /* ---------- nexus map (signature) ---------- */
  .nexus-stage{position:relative;aspect-ratio:1/1;max-width:100%;margin-inline:auto;width:100%}
  .nexus-stage svg{width:100%;height:100%;overflow:visible;display:block}
  .nx-node{cursor:pointer}
  .nx-ring{fill:none;stroke-width:2}
  .nx-link{stroke-width:2;opacity:.22;transition:opacity .25s,stroke-width .25s}
  .nexus-stage.hot .nx-link{opacity:.07}
  .nx-link.lit{opacity:.95;stroke-width:3}
  .nx-chip{fill:var(--surface-2);stroke:var(--line)}
  .nx-label{font-family:var(--ff-display);font-weight:700;font-size:15px;fill:var(--fg)}
  .nx-sub{font-family:var(--ff-mono);font-size:9.5px;letter-spacing:.04em}
  .nx-core-label{font-family:var(--ff-display);font-weight:800;font-size:16px;fill:#eafcff}
  .nx-flow{fill:var(--muted);font-family:var(--ff-mono);font-size:11px;opacity:0;transition:opacity .25s}
  .nx-flow.show{opacity:1}
  .nexus-cap{text-align:center;color:var(--faint);font-family:var(--ff-mono);font-size:.72rem;margin-top:14px;letter-spacing:.03em}

  /* ---------- section shell ---------- */
  section{position:relative}
  .band{padding-block:clamp(56px,7vw,104px)}
  .band.alt{background:linear-gradient(180deg,transparent,rgba(16,32,48,.45) 12%,rgba(16,32,48,.45) 88%,transparent)}
  .eyebrow{font-family:var(--ff-mono);font-size:.76rem;letter-spacing:.08em;color:var(--accent);margin-bottom:14px}
  .sec-head{max-width:60ch}
  .sec-head h2{font-size:var(--step-2)}
  .sec-head p{color:var(--muted);margin-top:16px;font-size:var(--step-1);line-height:1.45}

  /* ---------- interconnection flows ---------- */
  .flows{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;margin-top:40px}
  .flow{border:1px solid var(--line);border-radius:var(--r);padding:22px 22px 24px;background:var(--surface);position:relative;overflow:hidden}
  .flow::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--c,var(--accent))}
  .flow .route{display:flex;align-items:center;gap:9px;font-family:var(--ff-mono);font-size:.78rem;margin-bottom:12px;flex-wrap:wrap}
  .flow .route b{color:var(--fg);font-weight:600}
  .flow .route .ar{color:var(--faint)}
  .flow .route .m{padding:2px 8px;border-radius:6px;border:1px solid var(--line);color:var(--mc,var(--fg))}
  .flow h3{font-size:1.06rem;margin-bottom:8px}
  .flow p{color:var(--muted);font-size:var(--step--1);line-height:1.55}

  /* ---------- modules ---------- */
  .modules{display:flex;flex-direction:column;gap:20px;margin-top:40px}
  .mod{display:grid;grid-template-columns:76px minmax(0,1fr) auto;gap:26px;align-items:start;
    border:1px solid var(--line);border-radius:var(--r);background:var(--surface);
    padding:26px clamp(22px,3vw,34px);transition:border-color .2s,transform .2s;position:relative}
  .mod:hover{border-color:color-mix(in srgb,var(--mc) 55%,var(--line));transform:translateY(-2px)}
  .mod-ico{width:60px;height:60px;border-radius:15px;display:grid;place-items:center;
    background:color-mix(in srgb,var(--mc) 14%,var(--surface-2));border:1px solid color-mix(in srgb,var(--mc) 40%,var(--line))}
  .mod-ico svg{width:32px;height:32px}
  .mod-main{min-width:0}
  .mod-top{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:8px}
  .mod-top h3{font-size:1.34rem}
  .mod-top h3 span{color:var(--mc)}
  .status{font-family:var(--ff-mono);font-size:.68rem;letter-spacing:.05em;padding:3px 9px;border-radius:999px;border:1px solid}
  .status.live{color:var(--compliance);border-color:color-mix(in srgb,var(--compliance) 50%,transparent);background:color-mix(in srgb,var(--compliance) 12%,transparent)}
  .status.soon{color:var(--pulse);border-color:color-mix(in srgb,var(--pulse) 45%,transparent);background:color-mix(in srgb,var(--pulse) 10%,transparent)}
  .mod-desc{color:var(--muted);font-size:var(--step--1);line-height:1.55;max-width:62ch}
  .mod-caps{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
  .cap{font-family:var(--ff-mono);font-size:.72rem;color:var(--muted);border:1px solid var(--line-soft);border-radius:7px;padding:4px 9px;background:var(--ground)}
  .mod-side{display:flex;flex-direction:column;gap:9px;align-items:flex-end;white-space:nowrap}
  .mlink{font-size:var(--step--1);font-weight:600;color:var(--mc)}
  .mlink:hover{text-decoration:underline}
  .mlink.muted{color:var(--muted)}

  /* ---------- console preview ---------- */
  .console{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.9fr);gap:clamp(28px,4vw,52px);align-items:center;margin-top:12px}
  .panel{border:1px solid var(--line);border-radius:var(--r);background:
    linear-gradient(180deg,var(--surface-2),var(--surface));overflow:hidden;box-shadow:0 30px 70px -40px rgba(0,0,0,.8)}
  .panel-bar{display:flex;align-items:center;gap:8px;padding:12px 16px;border-bottom:1px solid var(--line);font-family:var(--ff-mono);font-size:.74rem;color:var(--muted)}
  .panel-bar .live{margin-left:auto;display:inline-flex;align-items:center;gap:7px;color:var(--compliance)}
  .panel-bar .live i{width:7px;height:7px;border-radius:50%;background:var(--compliance);box-shadow:0 0 8px var(--compliance);animation:blink 2.4s infinite}
  @keyframes blink{0%,100%{opacity:1}50%{opacity:.35}}
  .kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line)}
  .kpi{background:var(--surface);padding:16px}
  .kpi .n{font-family:var(--ff-display);font-weight:800;font-size:1.7rem;font-variant-numeric:tabular-nums}
  .kpi .l{font-family:var(--ff-mono);font-size:.68rem;color:var(--muted);margin-top:3px}
  .feed{padding:8px 0;max-height:210px;overflow:hidden}
  .ev{display:grid;grid-template-columns:auto auto 1fr auto;gap:10px;align-items:center;padding:7px 16px;font-family:var(--ff-mono);font-size:.74rem;border-bottom:1px solid var(--line-soft)}
  .ev:last-child{border-bottom:0}
  .ev .t{color:var(--faint)}
  .ev .sev{padding:1px 7px;border-radius:5px;font-size:.66rem}
  .ev .sev.c{color:var(--strike);background:color-mix(in srgb,var(--strike) 15%,transparent)}
  .ev .sev.h{color:var(--pulse);background:color-mix(in srgb,var(--pulse) 15%,transparent)}
  .ev .sev.i{color:var(--edr);background:color-mix(in srgb,var(--edr) 15%,transparent)}
  .ev .msg{color:var(--fg);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .ev .src{color:var(--muted)}

  /* ---------- trust ---------- */
  .trust{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;margin-top:40px}
  .trust .t{border:1px solid var(--line);border-radius:var(--r);padding:22px;background:var(--surface)}
  .trust .t h3{font-size:1.04rem;margin-bottom:8px}
  .trust .t p{color:var(--muted);font-size:var(--step--1);line-height:1.5}
  .trust .t .ic{width:30px;height:30px;color:var(--accent);margin-bottom:14px}

  /* ---------- cta + footer ---------- */
  .cta-band{text-align:center;padding-block:clamp(60px,8vw,110px)}
  .cta-band h2{font-size:var(--step-2);max-width:18ch;margin-inline:auto}
  .cta-band p{color:var(--muted);margin-top:16px;max-width:52ch;margin-inline:auto;font-size:var(--step-1)}
  .cta-band .hero-cta{justify-content:center;margin-top:30px}
  .contact-line{margin-top:22px;font-family:var(--ff-mono);font-size:.82rem;color:var(--muted)}
  .contact-line b{color:var(--fg);font-weight:600;user-select:all}
  .site-foot{border-top:1px solid var(--line-soft);padding-block:40px 48px;color:var(--muted)}
  .foot-grid{display:flex;flex-wrap:wrap;gap:30px;justify-content:space-between;align-items:flex-start}
  .foot-brand{max-width:30ch}
  .foot-brand p{font-size:var(--step--1);margin-top:12px;line-height:1.5}
  .foot-cols{display:flex;gap:54px;flex-wrap:wrap}
  .foot-col h4{font-family:var(--ff-mono);font-size:.72rem;letter-spacing:.06em;color:var(--faint);margin:0 0 12px;font-weight:600}
  .foot-col a{display:block;color:var(--muted);font-size:var(--step--1);padding:4px 0}
  .foot-col a:hover{color:var(--fg)}
  .foot-base{margin-top:34px;padding-top:20px;border-top:1px solid var(--line-soft);
    display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:.78rem;color:var(--faint)}

  @media(max-width:860px){
    .hero-grid{grid-template-columns:1fr;gap:36px}
    .nexus-stage{max-width:440px}
    .console{grid-template-columns:1fr}
    .nav-links{display:none}
    .nav-links.open{display:flex;position:absolute;top:66px;right:0;left:0;flex-direction:column;
      background:var(--ground);border-bottom:1px solid var(--line);padding:16px 20px;gap:14px;align-items:flex-start}
    .nav-links.open .nav-cta{margin:4px 0 0}
    .menu-toggle{display:block}
    .mod{grid-template-columns:52px minmax(0,1fr);gap:16px}
    .mod-ico{width:50px;height:50px}.mod-ico svg{width:26px;height:26px}
    .mod-side{grid-column:1/-1;flex-direction:row;align-items:center;gap:16px;padding-top:4px;border-top:1px solid var(--line-soft);margin-top:4px}
  }
  @media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ===== product & contact pages ===== */
.crumb{font-family:var(--ff-mono);font-size:.76rem;color:var(--faint);padding-block:22px 0}
.crumb a{color:var(--muted)}.crumb a:hover{color:var(--accent)}
.crumb .sep{margin:0 8px;color:var(--line)}

.phero{padding-block:clamp(30px,4vw,54px) clamp(36px,5vw,64px)}
.phero .mark{width:64px;height:64px;border-radius:16px;display:grid;place-items:center;
  background:color-mix(in srgb,var(--mc) 14%,var(--surface-2));border:1px solid color-mix(in srgb,var(--mc) 40%,var(--line));margin-bottom:22px}
.phero .mark svg{width:34px;height:34px}
.phero .pk{display:inline-flex;align-items:center;gap:9px;font-family:var(--ff-mono);font-size:.74rem;letter-spacing:.05em;color:var(--mc);margin-bottom:16px}
.phero .pk .st{font-size:.66rem;letter-spacing:.05em;padding:3px 9px;border-radius:999px;border:1px solid}
.phero .pk .st.live{color:var(--compliance);border-color:color-mix(in srgb,var(--compliance) 50%,transparent);background:color-mix(in srgb,var(--compliance) 12%,transparent)}
.phero .pk .st.soon{color:var(--pulse);border-color:color-mix(in srgb,var(--pulse) 45%,transparent);background:color-mix(in srgb,var(--pulse) 10%,transparent)}
.phero h1{font-size:var(--step-3)}.phero h1 em{font-style:normal;color:var(--mc)}
.phero .lead{color:var(--muted);font-size:var(--step-1);margin-top:18px;max-width:52ch;line-height:1.45}
.phero .hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.btn-mc{background:var(--mc);color:#04202b;border:1px solid transparent}
.btn-mc:hover{filter:brightness(1.12);transform:translateY(-1px)}

.feat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px;margin-top:42px}
.feat{border:1px solid var(--line);border-radius:var(--r);background:var(--surface);padding:22px}
.feat .fi{width:30px;height:30px;color:var(--mc);margin-bottom:14px}
.feat h3{font-size:1.08rem;margin-bottom:8px}
.feat p{color:var(--muted);font-size:var(--step--1);line-height:1.55}

.speclist{display:flex;flex-direction:column;gap:0;margin-top:34px;border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.speclist .row{display:grid;grid-template-columns:200px 1fr;gap:18px;padding:16px 22px;border-bottom:1px solid var(--line-soft);background:var(--surface)}
.speclist .row:last-child{border-bottom:0}
.speclist .row .k{font-family:var(--ff-mono);font-size:.78rem;color:var(--faint);text-transform:uppercase;letter-spacing:.04em}
.speclist .row .v{color:var(--fg);font-size:var(--step--1)}
.speclist .row .v b{color:var(--mc)}

.xmods{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin-top:40px}
.xmod{border:1px solid var(--line);border-radius:var(--r);padding:20px;background:var(--surface);position:relative}
.xmod::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--xc)}
.xmod .rt{display:flex;align-items:center;gap:9px;font-family:var(--ff-mono);font-size:.78rem;margin-bottom:10px;flex-wrap:wrap}
.xmod .rt .m{padding:2px 8px;border-radius:6px;border:1px solid var(--line)}
.xmod .rt .ar{color:var(--faint)}
.xmod p{color:var(--muted);font-size:var(--step--1);line-height:1.55}

ul.checks{list-style:none;margin:24px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px 24px}
ul.checks li{position:relative;padding-left:26px;color:var(--muted);font-size:var(--step--1);line-height:1.5}
ul.checks li::before{content:"";position:absolute;left:0;top:7px;width:12px;height:12px;border-radius:3px;background:color-mix(in srgb,var(--mc) 25%,transparent);border:1px solid var(--mc)}

/* contact */
.contact-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.8fr);gap:clamp(28px,4vw,56px);margin-top:14px;align-items:start}
.form{display:flex;flex-direction:column;gap:14px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-family:var(--ff-mono);font-size:.74rem;letter-spacing:.04em;color:var(--muted)}
.field input,.field textarea,.field select{font-family:var(--ff-body);font-size:var(--step-0);color:var(--fg);background:var(--surface);
  border:1px solid var(--line);border-radius:10px;padding:11px 13px;width:100%}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--accent);outline:none}
.field textarea{resize:vertical;min-height:110px}
.form .row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.formnote{font-size:.82rem;color:var(--faint);line-height:1.5}
.formok{display:none;border:1px solid var(--compliance);background:color-mix(in srgb,var(--compliance) 10%,transparent);
  border-radius:12px;padding:18px;color:var(--fg);font-size:var(--step--1);line-height:1.5}
.formok.show{display:block}
.cside{border:1px solid var(--line);border-radius:var(--r);background:var(--surface);padding:24px;display:flex;flex-direction:column;gap:18px}
.cside .ci h3{font-size:1rem;margin-bottom:5px}
.cside .ci p{color:var(--muted);font-size:var(--step--1);line-height:1.5}
.cside .ci b{color:var(--fg);user-select:all}
@media(max-width:720px){.contact-grid{grid-template-columns:1fr}.form .row2{grid-template-columns:1fr}.speclist .row{grid-template-columns:1fr;gap:4px}}
.formok.err{border-color:var(--strike);background:color-mix(in srgb,var(--strike) 10%,transparent)}