/* ============================================================
   Archimedes Global — vendor static prototype
   Authorized palette only: tan #CDB87C, black #000, navy #37637D, white.
   Type: Source Serif 4 (display, echoes logo), IBM Plex Sans (body),
         IBM Plex Mono (identifiers / labels / data).
   ============================================================ */
:root{
  --navy:#37637D;
  --navy-deep:#2A4D62;          /* navy shaded for proof/footer bands (navy family) */
  --tan:#CDB87C;
  --tan-soft:#D9C694;
  --black:#000000;
  --white:#FFFFFF;
  --wash:rgba(55,99,125,.05);   /* faint navy tint panel */
  --line:rgba(0,0,0,.12);
  --line-navy:rgba(55,99,125,.22);
  --ink:#000000;
  --ink-soft:rgba(0,0,0,.7);
  --display:"Source Serif 4",Georgia,"Times New Roman",serif;
  --body:"IBM Plex Sans",system-ui,Arial,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
  --maxw:1180px;
  --pad:clamp(20px,5vw,64px);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--body);color:var(--ink);background:var(--white);font-size:17px;line-height:1.62;-webkit-font-smoothing:antialiased}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-family:var(--display);margin:0;line-height:1.1;font-weight:600;letter-spacing:-.01em}
p{margin:0 0 1.1em}

.container{width:min(var(--maxw),100% - 2*var(--pad));margin-inline:auto}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--black);color:#fff;padding:12px 18px;z-index:200;font-family:var(--mono);font-size:13px}
.skip-link:focus{left:12px;top:12px}
:focus-visible{outline:3px solid var(--tan);outline-offset:2px}

.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;font-weight:500;color:var(--navy);display:inline-flex;align-items:center;gap:10px;margin:0 0 4px}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--tan)}
.eyebrow.on-dark{color:var(--tan)}
.eyebrow.on-dark::before{background:var(--tan)}
.tick{position:relative}
.tick::before{content:"";position:absolute;top:-2px;left:0;width:9px;height:9px;border-left:1.5px solid var(--tan);border-top:1.5px solid var(--tan)}

/* ---------- status ribbon ---------- */
.ribbon{background:var(--black);color:#fff;font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;text-align:center;padding:7px var(--pad);display:flex;gap:14px;justify-content:center;align-items:center;flex-wrap:wrap}
.ribbon b{color:var(--tan);font-weight:600}

/* ---------- header / nav ---------- */
.site-header{position:sticky;top:0;z-index:60;background:var(--white);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:78px;padding-block:10px}
.logo-link{display:inline-flex;align-items:center;flex:none}
.logo{height:53px;width:auto}
.primary-nav ul{list-style:none;display:flex;gap:2px;margin:0;padding:0;align-items:center}
.primary-nav a{font-size:14.5px;font-weight:500;padding:9px 12px;color:var(--ink-soft);position:relative;border-radius:2px;transition:color .15s}
.primary-nav a:hover{color:var(--navy)}
.primary-nav a[aria-current="page"]{color:var(--ink)}
.primary-nav a[aria-current="page"]::after{content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;background:var(--tan)}
.nav-toggle{display:none;font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;background:none;border:1px solid var(--line);padding:11px 14px;border-radius:2px;cursor:pointer;color:var(--ink)}

/* ---------- buttons ---------- */
.button,.btn{display:inline-flex;align-items:center;gap:9px;font-family:var(--body);font-weight:600;font-size:15px;padding:14px 22px;border-radius:2px;cursor:pointer;border:1.5px solid transparent;transition:.16s;letter-spacing:.005em;text-align:left}
.btn .arw{font-family:var(--mono);font-size:14px;transition:transform .16s}
.btn:hover .arw{transform:translateX(3px)}
.btn-tan{background:var(--tan);color:var(--black)}
.btn-tan:hover{background:var(--tan-soft)}
.btn-navy{background:var(--navy);color:#fff}
.btn-navy:hover{background:var(--navy-deep)}
.btn-ghost{background:transparent;border-color:var(--line-navy);color:var(--navy)}
.btn-ghost:hover{border-color:var(--navy);background:var(--wash)}
.btn-ghost-light{background:transparent;border-color:rgba(255,255,255,.4);color:#fff}
.btn-ghost-light:hover{border-color:var(--tan);color:var(--tan)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- heros ---------- */
.hero{background:var(--navy);color:#fff;position:relative;overflow:hidden}
.hero .container{position:relative;z-index:2}
.hero-inner{padding:clamp(56px,8vw,104px) 0 clamp(48px,6vw,80px)}
.hero h1{color:#fff;font-size:clamp(33px,5vw,60px);max-width:17ch;font-weight:600;letter-spacing:-.02em}
.hero .sub{font-size:clamp(17px,2vw,21px);max-width:62ch;margin-top:24px;color:rgba(255,255,255,.86);font-family:var(--body)}
.hero .body{max-width:64ch;margin-top:18px;color:rgba(255,255,255,.7);font-size:16.5px;font-family:var(--body)}
.hero .cta-row{margin-top:34px}

.phero{background:var(--navy);color:#fff;position:relative;overflow:hidden}
.phero-inner{padding:clamp(48px,7vw,88px) 0 clamp(40px,5vw,64px)}
.phero h1{color:#fff;font-size:clamp(28px,4.4vw,46px);max-width:20ch;margin-top:14px}
.phero .sub{color:rgba(255,255,255,.84);max-width:62ch;margin-top:18px;font-size:clamp(16px,1.8vw,19px);font-family:var(--body)}
.phero .cta-row{margin-top:28px}
.crumb{font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--tan);display:inline-flex;gap:8px;align-items:center}
.crumb:hover{color:#fff}

/* ---------- proof band ---------- */
.proof{background:var(--navy-deep);border-top:1px solid rgba(205,184,124,.3)}
.proof .proof-list{display:flex;flex-wrap:wrap;margin:0;padding:0;list-style:none}
.proof .proof-list li{font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;color:#fff;padding:17px 22px;border-right:1px solid rgba(255,255,255,.13);text-transform:uppercase;white-space:nowrap}
.proof .proof-list li:first-child{padding-left:0}
.proof .proof-list li b{color:var(--tan);font-weight:600}

/* ---------- sections ---------- */
.section{padding:clamp(56px,8vw,100px) 0}
.section.wash{background:var(--wash)}
.sec-head{max-width:760px;margin-bottom:44px}
.sec-head h2{font-size:clamp(27px,4vw,40px);margin:16px 0 0}
.lead{font-size:clamp(18px,2vw,21px);line-height:1.55;color:var(--ink);font-family:var(--body)}

.split{display:grid;grid-template-columns:1.4fr 1fr;gap:clamp(34px,6vw,76px);align-items:start}

/* ---------- cards ---------- */
.grid{display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.cell{background:var(--white);padding:30px 28px;position:relative;display:flex;flex-direction:column;transition:background .18s}
.cell .idx{font-family:var(--mono);font-size:12px;color:var(--navy);letter-spacing:.1em}
.cell h3{font-size:20px;margin:13px 0 10px;letter-spacing:-.01em;line-height:1.18}
.cell p{font-size:15px;color:var(--ink-soft);margin:0}
.cell .buyer{margin-top:12px;font-size:13.5px;color:var(--navy)}
.cell .buyer b{font-family:var(--mono);font-weight:500}
.cell .more{font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--navy);margin-top:auto;padding-top:18px;display:inline-flex;gap:7px;align-items:center}
a.cell{cursor:pointer}
a.cell::before{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:var(--tan);transition:width .22s}
a.cell:hover{background:var(--wash)}
a.cell:hover::before{width:100%}
a.cell:hover .more{color:var(--navy-deep)}

/* ---------- why list ---------- */
.why{display:grid;grid-template-columns:repeat(2,1fr);border-top:1px solid var(--line)}
.why .row{padding:28px 34px 28px 0;border-bottom:1px solid var(--line);display:flex;gap:20px}
.why .row:nth-child(even){padding-left:46px;border-left:1px solid var(--line)}
.why .n{font-family:var(--mono);font-size:13px;color:var(--tan);font-weight:600;padding-top:5px}
.why h3{font-size:18px;margin-bottom:7px}
.why p{font-size:15px;color:var(--ink-soft);margin:0}

/* ---------- detail blocks ---------- */
.svc-list{list-style:none;padding:0;margin:0;border-top:1px solid var(--line)}
.svc-list li{padding:14px 0 14px 28px;border-bottom:1px solid var(--line);position:relative;font-size:15.5px}
.svc-list li::before{content:"";position:absolute;left:0;top:22px;width:11px;height:1.5px;background:var(--tan)}
.panel{background:var(--wash);border:1px solid var(--line-navy);padding:28px 30px;border-radius:3px}
.panel h4{font-size:14px;font-family:var(--mono);font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--navy);margin:0 0 14px}
.panel p{font-size:15px;color:var(--ink-soft);margin:0}
.usecases{display:grid;gap:16px;max-width:880px}
.usecase{display:flex;gap:18px;align-items:flex-start}
.usecase .uc-n{font-family:var(--mono);font-size:13px;color:var(--tan);font-weight:600;border:1px solid var(--line-navy);width:34px;height:34px;flex:none;display:flex;align-items:center;justify-content:center;border-radius:2px}
.usecase p{margin:0;font-size:15.5px;color:var(--ink-soft);padding-top:5px}

/* ---------- tables ---------- */
.table{width:100%;border-collapse:collapse;border:1px solid var(--line);font-size:15px}
.table th{background:var(--navy);color:#fff;text-align:left;font-family:var(--mono);font-weight:500;font-size:12px;letter-spacing:.1em;text-transform:uppercase;padding:14px 18px}
.table td{padding:16px 18px;border-top:1px solid var(--line);vertical-align:top;color:var(--ink-soft)}
.table td:first-child{font-weight:600;color:var(--ink)}
.table .code{font-family:var(--mono);font-size:14px;color:var(--navy)}

/* ---------- spec list ---------- */
.spec{border-top:1px solid var(--line)}
.spec .r{display:grid;grid-template-columns:220px 1fr;gap:24px;padding:14px 0;border-bottom:1px solid var(--line)}
.spec .k{font-family:var(--mono);font-size:13px;letter-spacing:.05em;color:var(--navy);text-transform:uppercase}
.spec .v{font-size:15.5px}
.spec .v.code{font-family:var(--mono);letter-spacing:.03em}
.spec .r.flag .v{display:inline-flex;align-items:center;gap:10px;flex-wrap:wrap}
.spec .r.flag .v::after{content:"This page only";font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--black);background:var(--tan);padding:3px 8px;border-radius:2px}

/* ---------- buy block ---------- */
.buyblock{display:grid;grid-template-columns:1.1fr 1fr;border-radius:3px;overflow:hidden;background:var(--navy);color:#fff}
.buyblock .l{padding:clamp(32px,4vw,52px)}
.buyblock .l h2{color:#fff;font-size:clamp(26px,3.4vw,38px)}
.buyblock .l p{color:rgba(255,255,255,.8);margin-top:14px;font-family:var(--body)}
.buyblock .r{background:var(--navy-deep);padding:clamp(32px,4vw,52px);display:flex;flex-direction:column;justify-content:center}
.buyblock .vl{display:flex;justify-content:space-between;gap:16px;padding:13px 0;border-bottom:1px solid rgba(255,255,255,.14);font-size:15px}
.buyblock .vl:last-child{border-bottom:none}
.buyblock .vl span:first-child{color:rgba(255,255,255,.7)}
.buyblock .vl span:last-child{font-family:var(--mono);color:var(--tan);font-size:14px}

/* ---------- contact ---------- */
.route{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.route .c{background:#fff;padding:28px}
.route .lab{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--navy)}
.route .c h3{font-size:17px;margin:10px 0 8px}
.route .c p{font-size:14.5px;color:var(--ink-soft);margin:0 0 14px}
.route .c a{font-family:var(--mono);font-size:13.5px;color:var(--navy);border-bottom:1px solid var(--tan);padding-bottom:1px}
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{font-family:var(--mono);font-size:12.5px;letter-spacing:.06em;border:1px solid var(--line-navy);color:var(--navy);padding:8px 13px;border-radius:2px}
.inline-mail{font-family:var(--mono);color:var(--navy);border-bottom:1px solid var(--tan)}

/* ---------- footer ---------- */
.site-footer{background:var(--navy);color:#fff;padding:clamp(54px,7vw,78px) 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1.2fr;gap:46px}
.footer-logo{height:72px;width:auto;display:block}
.site-footer .stmt{color:rgba(255,255,255,.78);font-size:15px;max-width:46ch;margin-top:18px;font-family:var(--body)}
.footer-heading{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--tan);font-weight:500;margin:0 0 16px}
.footer-list{list-style:none;padding:0;margin:0;display:grid;gap:11px}
.footer-list a{color:rgba(255,255,255,.84);font-size:15px}
.footer-list a:hover{color:var(--tan)}
.footer-ids{font-family:var(--mono);font-size:13px;color:rgba(255,255,255,.8);line-height:2}
.footer-mail{font-family:var(--mono);font-size:14px;color:var(--tan);border-bottom:1px solid rgba(205,184,124,.5);padding-bottom:2px}
.footer-bottom{margin-top:clamp(44px,6vw,68px);border-top:1px solid rgba(255,255,255,.16);padding:22px 0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:rgba(255,255,255,.6);text-transform:uppercase}

.stack-lg{display:grid;gap:clamp(50px,7vw,80px)}

/* ---------- responsive ---------- */
@media (max-width:940px){
  .split{grid-template-columns:1fr}
  .buyblock{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .why{grid-template-columns:1fr}
  .why .row:nth-child(even){padding-left:0;border-left:none}
  .why .row{padding-right:0}
}
@media (max-width:780px){
  .nav-toggle{display:inline-block}
  .primary-nav{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--line);padding:8px var(--pad) 20px}
  .primary-nav.open{display:block}
  .primary-nav ul{flex-direction:column;align-items:stretch;gap:0}
  .primary-nav a{padding:14px 0;border-bottom:1px solid var(--line)}
  .primary-nav a[aria-current="page"]::after{display:none}
  .site-header .container{position:relative}
  .grid.c2,.grid.c3,.route{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .spec .r{grid-template-columns:1fr;gap:4px}
  .proof .proof-list li{border-right:none;border-bottom:1px solid rgba(255,255,255,.12);width:100%;padding:13px 0}
}

/* ============================================================
   September 2026 refinement pass
   ============================================================ */
.site-header{box-shadow:0 1px 0 rgba(0,0,0,.04)}
.primary-nav a.nav-buy{border:1px solid var(--line-navy);color:var(--navy);margin-left:5px;padding-inline:13px}
.primary-nav a.nav-buy:hover{background:var(--wash);border-color:var(--navy)}
.primary-nav a.nav-buy[aria-current="page"]{background:var(--navy);border-color:var(--navy);color:#fff}
.primary-nav a.nav-buy[aria-current="page"]::after{display:none}

.hero{background:linear-gradient(112deg,var(--navy-deep) 0%,var(--navy) 68%)}
.hero h1{max-width:18ch;text-wrap:balance}
.hero .sub{max-width:67ch}
.hero .body{max-width:68ch}
.hero .cta-row .btn{min-height:50px}

.section-intro{max-width:72ch;color:var(--ink-soft);margin:-24px 0 34px;font-size:16px}
.signal-panel{padding:30px 32px}
.signal-list{list-style:none;padding:0;margin:3px 0 0}
.signal-list li{position:relative;padding:13px 0 13px 24px;border-bottom:1px solid var(--line-navy);font-size:15px;color:var(--ink-soft)}
.signal-list li:last-child{border-bottom:0;padding-bottom:2px}
.signal-list li::before{content:"";position:absolute;left:0;top:22px;width:10px;height:2px;background:var(--tan)}

.action-section{border-top:1px solid var(--line-navy)}
.action-paths{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.action-card{background:#fff;padding:30px 28px;min-height:265px;display:flex;flex-direction:column;position:relative;transition:background .18s}
.action-card::before{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:var(--tan);transition:width .22s}
.action-card:hover{background:rgba(55,99,125,.035)}
.action-card:hover::before{width:100%}
.action-card .idx{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--navy)}
.action-card h3{font-size:21px;line-height:1.2;margin:14px 0 11px;max-width:19ch}
.action-card p{font-size:15px;color:var(--ink-soft);margin:0}
.action-card .more{font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--navy);margin-top:auto;padding-top:22px;display:inline-flex;gap:7px;align-items:center}

/* Slightly stronger content hierarchy on detail pages. */
.phero{background:linear-gradient(112deg,var(--navy-deep) 0%,var(--navy) 72%)}
.phero h1{text-wrap:balance}
.panel{box-shadow:inset 0 1px 0 rgba(255,255,255,.65)}
.grid,.action-paths,.table{box-shadow:0 10px 30px rgba(42,77,98,.035)}

@media (max-width:1040px){
  .primary-nav a{padding-inline:9px;font-size:14px}
  .primary-nav a.nav-buy{margin-left:2px;padding-inline:10px}
}
@media (max-width:940px){
  .action-paths{grid-template-columns:1fr 1fr}
  .action-card:last-child{grid-column:1 / -1;min-height:220px}
}
@media (max-width:780px){
  .primary-nav a.nav-buy{margin-left:0;border:0;border-bottom:1px solid var(--line);padding-inline:0;background:transparent!important;color:var(--ink-soft)!important}
  .primary-nav a.nav-buy[aria-current="page"]{color:var(--ink)!important}
  .action-paths{grid-template-columns:1fr}
  .action-card,.action-card:last-child{grid-column:auto;min-height:0}
  .section-intro{margin-top:-18px}
}