/* ==========================================================================
   GlobXAI — Industrial design system  (self-contained, no Tailwind)
   Premium industrial engineering consultancy x modern tech-implementation.
   Palette: graphite / off-white / steel grey + restrained signal-blue accent.
   Sharp corners, strong type, generous spacing. Light + dark aware.
   ========================================================================== */
:root{
  --graphite:#14171c;      /* near-black industrial base */
  --graphite-2:#1c2026;
  --ink:#14171c;           /* headings on light */
  --body:#3f454e;          /* body text */
  --muted:#6b7280;         /* secondary */
  --faint:#9aa1ab;         /* tertiary */
  --paper:#ffffff;
  --off:#f6f6f4;           /* off-white section */
  --steel:#e7e9ec;         /* steel grey surfaces */
  --steel-2:#dcdfe4;
  --line:#e6e8eb;          /* hairline */
  --line-2:#d7dade;
  --accent:#2F5BFF;        /* signal blue */
  --accent-700:#1f43d6;
  --accent-ink:#14233f;    /* deep blue text on tint */
  --accent-tint:#eef2ff;
  --amber:#e08a00;         /* data/alert highlight, used sparingly */
  --ok:#1f8a4c;
  --warn:#b4540a;
  --sh-sm:0 1px 2px rgba(16,18,28,.06), 0 1px 1px rgba(16,18,28,.04);
  --sh-md:0 12px 34px -16px rgba(16,18,28,.18), 0 4px 12px -8px rgba(16,18,28,.10);
  --sh-lg:0 30px 70px -30px rgba(16,18,28,.28), 0 12px 28px -16px rgba(16,18,28,.12);
  --ease:cubic-bezier(.2,.6,.2,1);
  --maxw:1180px;
  --radius:3px;
}
:root:not([data-theme="light"]) { }
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --ink:#f3f5f8; --body:#c2c7d0; --muted:#8e97a4; --faint:#6b7480;
    --paper:#0f1216; --off:#14181d; --steel:#1b2027; --steel-2:#222933;
    --line:#242b33; --line-2:#2c333d; --accent:#6f90ff; --accent-700:#89a3ff;
    --accent-ink:#cdd9ff; --accent-tint:#161c2b; --graphite:#0b0d10; --graphite-2:#12151a;
    --sh-sm:0 1px 2px rgba(0,0,0,.4); --sh-md:0 14px 34px -18px rgba(0,0,0,.6);
    --sh-lg:0 30px 70px -30px rgba(0,0,0,.7);
  }
}
:root[data-theme="dark"]{
  --ink:#f3f5f8; --body:#c2c7d0; --muted:#8e97a4; --faint:#6b7480;
  --paper:#0f1216; --off:#14181d; --steel:#1b2027; --steel-2:#222933;
  --line:#242b33; --line-2:#2c333d; --accent:#6f90ff; --accent-700:#89a3ff;
  --accent-ink:#cdd9ff; --accent-tint:#161c2b; --graphite:#0b0d10; --graphite-2:#12151a;
  --sh-sm:0 1px 2px rgba(0,0,0,.4); --sh-md:0 14px 34px -18px rgba(0,0,0,.6);
  --sh-lg:0 30px 70px -30px rgba(0,0,0,.7);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--paper);color:var(--body);
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  font-weight:400;line-height:1.62;font-size:16.5px;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  letter-spacing:-.006em;overflow-x:hidden;
}
::selection{background:var(--accent);color:#fff}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
svg{display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none}
h1,h2,h3,h4{color:var(--ink);font-weight:500;line-height:1.1;letter-spacing:-.022em;overflow-wrap:break-word;text-wrap:balance}
p{text-wrap:pretty}
strong{color:var(--ink);font-weight:600}
:focus-visible{outline:2.5px solid var(--accent);outline-offset:2px;border-radius:2px}

/* ---------- layout ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,48px)}
.section{padding:clamp(64px,9vw,112px) 0}
.section.tight{padding:clamp(44px,6vw,72px) 0}
.section.off{background:var(--off)}
.section.steel{background:var(--steel)}
.dark{background:var(--graphite);color:rgba(255,255,255,.76)}
.dark h1,.dark h2,.dark h3,.dark h4{color:#fff}
.dark .muted{color:rgba(255,255,255,.6)}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:18px}
.kicker::before{content:"";width:22px;height:1.5px;background:var(--accent);display:inline-block}
.dark .kicker{color:var(--accent)}
.eyebrow{font-size:13px;font-weight:600;letter-spacing:.04em;color:var(--muted);text-transform:uppercase}
.h1{font-size:clamp(34px,5.2vw,62px);font-weight:600;letter-spacing:-.03em;line-height:1.04}
.h2{font-size:clamp(27px,3.4vw,42px);font-weight:600;letter-spacing:-.028em;line-height:1.08;margin-bottom:16px}
.h3{font-size:clamp(20px,2vw,25px);font-weight:600;letter-spacing:-.02em}
.lede{font-size:clamp(17px,1.5vw,20px);line-height:1.6;color:var(--body);max-width:62ch}
.muted{color:var(--muted)}
.measure{max-width:70ch}
.center{text-align:center}
.center .lede{margin-left:auto;margin-right:auto}
.grid{display:grid;gap:clamp(18px,2.4vw,30px)}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(28px,5vw,72px);align-items:center}
.stack>*+*{margin-top:16px}
.mt0{margin-top:0}.mt1{margin-top:10px}.mt2{margin-top:22px}.mt3{margin-top:36px}.mt4{margin-top:56px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 26px;font-size:15px;font-weight:600;letter-spacing:-.01em;
  border-radius:var(--radius);transition:all .2s var(--ease);white-space:nowrap}
.btn .arr{transition:transform .22s var(--ease)}
.btn:hover .arr{transform:translateX(4px)}
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 1px 2px rgba(47,91,255,.25),0 10px 26px -12px rgba(47,91,255,.55)}
.btn-accent:hover{background:var(--accent-700);transform:translateY(-1px)}
.btn-line{border:1px solid var(--line-2);color:var(--ink);background:var(--paper)}
.btn-line:hover{border-color:var(--muted);transform:translateY(-1px);box-shadow:var(--sh-sm)}
.dark .btn-line{border-color:rgba(255,255,255,.24);color:#fff;background:transparent}
.dark .btn-line:hover{border-color:rgba(255,255,255,.5);background:rgba(255,255,255,.06)}
.dark .btn-accent{background:#fff;color:var(--graphite);box-shadow:none}
.dark .btn-accent:hover{background:#e9edff}
.btn-sm{padding:10px 18px;font-size:13.5px}
.btn-ghost{color:var(--accent);font-weight:600}
.btn-ghost:hover{text-decoration:underline}
.cta-row{display:flex;gap:14px;flex-wrap:wrap}
.center .cta-row{justify-content:center}

/* ---------- header ---------- */
header.hd{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--paper) 82%,transparent);
  backdrop-filter:blur(18px) saturate(160%);-webkit-backdrop-filter:blur(18px) saturate(160%);
  border-bottom:1px solid var(--line);transition:box-shadow .3s}
header.hd.scrolled{box-shadow:0 8px 26px -20px rgba(16,18,28,.4)}
.hd-in{display:flex;align-items:center;justify-content:space-between;height:66px;max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,48px)}
.logo{display:inline-flex;align-items:center;font-weight:600;font-size:20px;letter-spacing:.22em;color:var(--ink);line-height:1}
.logo .xm{width:30px;height:30px;margin:-4px -2px -3px 2px;flex-shrink:0}
nav.main{display:flex;gap:26px;align-items:center}
nav.main a{font-size:14.5px;font-weight:500;color:var(--muted);transition:color .18s;position:relative;white-space:nowrap}
nav.main a:hover,nav.main a.active{color:var(--ink)}
nav.main a.active::after{content:"";position:absolute;left:0;right:0;bottom:-22px;height:2px;background:var(--accent)}
nav.main .btn{color:#fff}
nav.main .btn-line{color:var(--ink)}
.burger{display:none;flex-direction:column;gap:5px;width:26px}
.burger span{height:2px;background:var(--ink);border-radius:2px;transition:.3s}
#mnav{display:none}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0;background-size:cover;background-position:center}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,var(--graphite) 30%,rgba(20,23,28,.82) 60%,rgba(20,23,28,.55))}
.hero-in{position:relative;z-index:1;padding:clamp(72px,12vh,140px) 0 clamp(60px,9vh,110px);color:#fff}
.hero-in .kicker{color:#9bb4ff}
.hero-in h1{color:#fff;max-width:17ch}
.hero-in .lede{color:rgba(255,255,255,.82);margin-top:24px;max-width:56ch}
.hero-in .cta-row{margin-top:36px}
.hero-stats{display:flex;gap:clamp(24px,5vw,64px);margin-top:48px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.14);padding-top:28px}
.hero-stats .s b{display:block;font-size:clamp(24px,3vw,34px);font-weight:600;color:#fff;letter-spacing:-.02em;line-height:1}
.hero-stats .s span{font-size:13px;color:rgba(255,255,255,.6);margin-top:7px;display:block}

/* ---------- principles strip ---------- */
.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.principles .p{background:var(--paper);padding:clamp(26px,3vw,38px)}
.principles .p .n{font-size:13px;font-weight:600;color:var(--accent);letter-spacing:.06em}
.principles .p h3{margin:12px 0 8px;font-size:21px}

/* ---------- cards ---------- */
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(22px,2.5vw,30px);transition:border-color .2s,box-shadow .25s,transform .2s}
.card.hover:hover{border-color:var(--line-2);box-shadow:var(--sh-md);transform:translateY(-2px)}
.card h3{font-size:20px;margin-bottom:10px}
.card p{font-size:15.5px;color:var(--body)}
.card .ic{width:44px;height:44px;border-radius:var(--radius);background:var(--accent-tint);color:var(--accent);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.card .ic svg{width:22px;height:22px;stroke:currentColor;stroke-width:1.6;fill:none}
.tag{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.03em;padding:4px 10px;border-radius:30px;background:var(--accent-tint);color:var(--accent-ink)}
.dark .tag{background:rgba(255,255,255,.1);color:#cdd9ff}

/* evidence badges */
.ev{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:600;padding:4px 11px;border-radius:30px;letter-spacing:.02em}
.ev::before{content:"";width:7px;height:7px;border-radius:50%}
.ev.measured{background:#e8f6ee;color:#1f8a4c}.ev.measured::before{background:#1f8a4c}
.ev.pilot{background:#fff4e2;color:#b4540a}.ev.pilot::before{background:#e08a00}
.ev.illustrative{background:var(--steel);color:var(--muted)}.ev.illustrative::before{background:var(--faint)}
.dark .ev.measured{background:rgba(31,138,76,.18)}.dark .ev.pilot{background:rgba(224,138,0,.18)}.dark .ev.illustrative{background:rgba(255,255,255,.08);color:var(--faint)}

/* ---------- lists ---------- */
.ticks{list-style:none}
.ticks li{position:relative;padding:9px 0 9px 32px;border-bottom:1px solid var(--line);font-size:15.5px}
.ticks li:last-child{border-bottom:0}
.ticks li::before{content:"";position:absolute;left:4px;top:15px;width:14px;height:8px;border-left:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(-45deg)}
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.stat-row .st{background:var(--paper);padding:24px}
.stat-row .st b{display:block;font-size:30px;font-weight:600;color:var(--ink);letter-spacing:-.02em;line-height:1}
.stat-row .st span{font-size:13.5px;color:var(--muted);margin-top:8px;display:block}

/* ---------- process steps ---------- */
.steps{counter-reset:step;display:grid;gap:0}
.steps .step{display:grid;grid-template-columns:auto 1fr;gap:22px;padding:24px 0;border-top:1px solid var(--line)}
.steps .step:last-child{border-bottom:1px solid var(--line)}
.steps .step .no{counter-increment:step;font-size:14px;font-weight:600;color:var(--accent);min-width:34px}
.steps .step .no::before{content:"0" counter(step)}
.steps .step h3{font-size:19px;margin-bottom:6px}

/* ---------- FAQ ---------- */
.faq details{border-top:1px solid var(--line);padding:4px 0}
.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:18px 40px 18px 0;font-size:17px;font-weight:600;color:var(--ink);position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:15px;font-size:24px;font-weight:300;color:var(--accent);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{padding:0 40px 20px 0;color:var(--body);font-size:15.5px}

/* ---------- forms ---------- */
.field{margin-bottom:16px}
.field label{display:block;font-size:13.5px;font-weight:600;color:var(--ink);margin-bottom:7px}
.field .req{color:var(--accent)}
.field input,.field select,.field textarea{
  width:100%;padding:12px 14px;font-family:inherit;font-size:15px;color:var(--ink);
  background:var(--paper);border:1px solid var(--line-2);border-radius:var(--radius);transition:border-color .18s,box-shadow .18s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-tint)}
.field textarea{min-height:110px;resize:vertical}
.field .hint{font-size:12.5px;color:var(--muted);margin-top:6px}
.hp{position:absolute;left:-9999px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.note{font-size:13px;color:var(--muted);line-height:1.5}

/* ---------- footer ---------- */
footer.ft{background:var(--graphite);color:rgba(255,255,255,.62);padding:clamp(52px,7vw,80px) 0 34px}
footer.ft .logo{color:#fff}
footer.ft .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px}
footer.ft h4{color:#fff;font-size:13px;letter-spacing:.06em;text-transform:uppercase;margin-bottom:16px;font-weight:600}
footer.ft a{display:block;color:rgba(255,255,255,.62);font-size:14.5px;padding:5px 0;transition:color .18s}
footer.ft a:hover{color:#fff}
footer.ft .about{font-size:14.5px;line-height:1.6;max-width:36ch;margin:18px 0}
footer.ft .bot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:44px;padding-top:24px;border-top:1px solid rgba(255,255,255,.12);font-size:13px;color:rgba(255,255,255,.5)}
.disc{font-size:12.5px;color:rgba(255,255,255,.42);line-height:1.6;margin-top:16px;max-width:70ch}

/* ---------- breadcrumb ---------- */
.crumb{font-size:13px;color:var(--muted);padding:18px 0}
.crumb a:hover{color:var(--accent)}
.crumb span{margin:0 8px;color:var(--faint)}

/* ---------- banner / callout ---------- */
.callout{border:1px solid var(--line);border-left:3px solid var(--accent);background:var(--off);border-radius:var(--radius);padding:20px 24px}
.callout.warn{border-left-color:var(--amber)}
.ribbon{background:var(--accent-tint);color:var(--accent-ink);border-radius:var(--radius);padding:clamp(28px,4vw,48px);display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center}
.dark .ribbon{background:var(--graphite-2);color:#fff;border:1px solid rgba(255,255,255,.1)}
@media(max-width:720px){.ribbon{grid-template-columns:1fr}}

/* ---------- article ---------- */
.prose{max-width:72ch}
.prose h2{font-size:clamp(23px,2.6vw,31px);margin:44px 0 14px}
.prose h3{font-size:21px;margin:30px 0 10px}
.prose p{margin:0 0 16px;font-size:17px;line-height:1.7;color:var(--body)}
.prose ul,.prose ol{margin:0 0 18px 22px}
.prose li{margin:7px 0;font-size:16.5px}
.prose .formula{background:var(--off);border:1px solid var(--line);border-radius:var(--radius);padding:16px 20px;font-size:15px;margin:18px 0;color:var(--ink)}
.prose table{width:100%;border-collapse:collapse;margin:20px 0;font-size:15px}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.prose th{background:var(--off);font-weight:600;color:var(--ink)}
.meta{display:flex;gap:16px;flex-wrap:wrap;font-size:13.5px;color:var(--muted);margin:10px 0 30px}

/* ---------- reveal ---------- */
.rv{opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){.rv{opacity:1;transform:none;transition:none}}

/* ---------- modal ---------- */
#gx-modal{position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center;padding:20px;background:rgba(10,12,16,.55);backdrop-filter:blur(4px)}
#gx-modal.open{display:flex}
#gx-modal .box{background:var(--paper);border-radius:var(--radius);max-width:520px;width:100%;padding:clamp(26px,4vw,40px);box-shadow:var(--sh-lg);max-height:90vh;overflow:auto;position:relative}
#gx-modal .x{position:absolute;right:16px;top:14px;font-size:26px;color:var(--muted);line-height:1}
#gx-modal h3{font-size:24px;margin-bottom:10px}

/* ---------- WhatsApp float ---------- */
#wa{position:fixed;right:22px;bottom:22px;z-index:70;width:56px;height:56px;border-radius:50%;background:#25D366;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 30px -8px rgba(37,211,102,.6)}
#wa svg{width:30px;height:30px;fill:#fff}

/* ========================================================================
   ROI CALCULATOR
   ======================================================================== */
.calc{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(24px,3vw,40px);align-items:start}
.calc .panel{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(20px,2.6vw,30px)}
.calc .results{position:sticky;top:86px}
.calc fieldset{border:0;margin-bottom:26px}
.calc legend{font-size:13px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--accent);margin-bottom:14px;display:flex;align-items:center;gap:8px;width:100%}
.lever{border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;margin-bottom:10px}
.lever .top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.lever label.sw{display:flex;align-items:center;gap:10px;font-weight:600;color:var(--ink);font-size:15px;cursor:pointer}
.lever input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent)}
.lever .seg{display:inline-flex;border:1px solid var(--line-2);border-radius:var(--radius);overflow:hidden}
.lever .seg button{padding:6px 11px;font-size:12.5px;font-weight:600;color:var(--muted);background:var(--paper)}
.lever .seg button.on{background:var(--accent);color:#fff}
.lever .seg button:disabled{opacity:.4;cursor:not-allowed}
.big-num{font-size:clamp(34px,5vw,52px);font-weight:600;color:var(--ink);letter-spacing:-.03em;line-height:1}
.res-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-top:18px}
.res-grid .r{background:var(--paper);padding:18px}
.res-grid .r b{display:block;font-size:24px;font-weight:600;color:var(--ink);letter-spacing:-.02em;line-height:1.1}
.res-grid .r span{font-size:12.5px;color:var(--muted);display:block;margin-top:6px}
.res-grid .r.accent b{color:var(--accent)}
.stream{display:flex;justify-content:space-between;gap:14px;padding:10px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.stream:last-child{border-bottom:0}
.stream .lb{color:var(--body)}
.stream .lb small{display:block;color:var(--faint);font-size:11.5px;margin-top:2px}
.stream .v{font-weight:600;color:var(--ink);white-space:nowrap}
.scenario-tabs{display:inline-flex;border:1px solid var(--line-2);border-radius:var(--radius);overflow:hidden;margin-bottom:16px}
.scenario-tabs button{padding:9px 16px;font-size:13.5px;font-weight:600;color:var(--muted);background:var(--paper)}
.scenario-tabs button.on{background:var(--graphite);color:#fff}
.calc-note{font-size:12.5px;color:var(--muted);line-height:1.55;padding:8px 0}
.calc-note.warn{color:var(--warn)}

/* ---------- responsive ---------- */
@media(max-width:960px){
  .split{grid-template-columns:1fr}
  .g4{grid-template-columns:repeat(2,1fr)}
  .calc{grid-template-columns:1fr}
  .calc .results{position:static}
  footer.ft .cols{grid-template-columns:1fr 1fr}
  .principles{grid-template-columns:1fr}
}
@media(max-width:940px){
  nav.main{display:none}
  .burger{display:flex}
  #mnav{display:block;position:fixed;inset:66px 0 auto 0;z-index:49;background:var(--paper);border-bottom:1px solid var(--line);
    transform:translateY(-120%);transition:transform .3s var(--ease);max-height:calc(100vh - 66px);overflow:auto}
  #mnav.open{transform:none}
  #mnav a{display:block;padding:15px clamp(20px,5vw,48px);border-bottom:1px solid var(--line);font-weight:500;font-size:16px}
}
@media(max-width:680px){
  .g2,.g3,.g4{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .res-grid{grid-template-columns:1fr}
  footer.ft .cols{grid-template-columns:1fr}
  .hero-stats{gap:24px}
}