/* Measurement Science Resource ------------------------------------------- */
:root{
  --ink:#192028; --ink-soft:#515961; --paper:#faf9f4; --warm:#f3f0e9;
  --rule:#ccd2d7; --bronze:#a28048; --bronze-text:#7d6135; --muted-dark:#9aa3ab;
  --serif:"EB Garamond",Georgia,"Times New Roman",serif;
  --sans:"IBM Plex Sans","Helvetica Neue",Arial,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --wrap:1180px; --pad:clamp(20px,5vw,72px);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);
  font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%}
a{color:var(--bronze-text)}
a:hover{color:var(--ink)}
:focus-visible{outline:2px solid var(--bronze-text);outline-offset:3px}
.wrap{max-width:var(--wrap);margin:0 auto;padding-inline:var(--pad)}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;z-index:20;background:var(--ink);color:var(--paper);padding:10px 16px}

/* type ------------------------------------------------------------------- */
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.1;letter-spacing:-.008em;margin:0 0 .6em}
.h-xl{font-size:clamp(2.35rem,6vw,4.25rem);line-height:1.02}
.h-lg{font-size:clamp(1.75rem,3.6vw,2.5rem)}
.h-md{font-size:clamp(1.35rem,2.4vw,1.75rem)}
p{margin:0 0 1.1em}
.lede{font-size:clamp(1rem,1.35vw,1.0625rem);line-height:1.7;color:var(--ink-soft);max-width:38em}
.lede-sm{font-size:.95rem;line-height:1.75;max-width:40em}
.eyebrow{font-family:var(--mono);font-size:.625rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--bronze-text);margin:0 0 .9em}
.mono{font-family:var(--mono);letter-spacing:.04em}
.tiny{font-size:.625rem;letter-spacing:.12em;color:var(--ink-soft)}
.fine{font-size:.8125rem;color:var(--ink-soft);max-width:44em}
.num{font-family:var(--mono);font-size:.6875rem;letter-spacing:.18em;color:var(--bronze-text);margin:0 0 .7em}
blockquote{margin:1.4em 0;padding-left:18px;border-left:2px solid var(--bronze);
  font-size:.95rem;line-height:1.75;color:var(--ink)}
.mt{margin-top:1.6em}

/* marks ------------------------------------------------------------------ */
.mark-sm{width:44px;height:auto;flex:none}
.mark-md{width:40px;height:auto;flex:none}
.mark-xl{width:min(230px,38vw);height:auto}
.tick{width:120px;height:9px;display:block;margin-bottom:1.6em;overflow:visible}
.tick path{stroke:var(--rule);stroke-width:1.2;fill:none}
.tick .tick-marks path:nth-child(3){stroke:var(--bronze)}

/* header ----------------------------------------------------------------- */
.site-head{border-bottom:1px solid var(--rule);background:var(--paper);
  position:sticky;top:0;z-index:10}
.head-inner{display:flex;align-items:center;gap:24px;padding-block:18px}
.brand{display:flex;align-items:center;gap:13px;text-decoration:none;color:var(--ink);margin-right:auto}
.brand-name{font-family:var(--serif);font-weight:600;font-size:.9375rem;letter-spacing:.155em;
  text-transform:uppercase;line-height:1}
.nav-desktop ul{display:flex;gap:30px;list-style:none;margin:0;padding:0}
.nav-desktop a{color:var(--ink-soft);text-decoration:none;font-size:.875rem}
.nav-desktop a:hover,.nav-desktop a[aria-current]{color:var(--ink)}
.nav-desktop a[aria-current]{box-shadow:inset 0 -1px 0 var(--bronze)}
.nav-mobile{display:none}
.nav-mobile summary{list-style:none;cursor:pointer;display:flex;flex-direction:column;gap:5px;
  padding:8px;margin:-8px}
.nav-mobile summary::-webkit-details-marker{display:none}
.nav-mobile summary span{display:block;width:22px;height:1.5px;background:var(--ink)}
.nav-mobile ul{list-style:none;margin:14px 0 4px;padding:0;display:flex;flex-direction:column}
.nav-mobile li{border-top:1px solid var(--rule)}
.nav-mobile a{display:block;padding:13px 0;text-decoration:none;color:var(--ink);font-size:.9375rem}

/* buttons ---------------------------------------------------------------- */
.btn{display:inline-block;text-decoration:none;font-size:.875rem;font-weight:500;
  padding:14px 28px;transition:background .15s,color .15s}
.btn-dark{background:var(--ink);color:var(--paper)}
.btn-dark:hover{background:#0f151b;color:var(--paper)}
.btn-light{background:var(--paper);color:var(--ink)}
.btn-light:hover{background:#fff;color:var(--ink)}
.btn-block{display:block;text-align:center}
.head-cta{padding:11px 20px}
.link-underline{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--bronze);
  padding-bottom:3px;font-size:.875rem}
.link-arrow{font-size:.875rem;text-decoration:none;border-bottom:1px solid var(--rule);padding-bottom:2px}
.link-arrow::after{content:" \2192"}
.cta-row{display:flex;flex-wrap:wrap;gap:26px;align-items:center;margin-top:2em}

/* sections --------------------------------------------------------------- */
.band{padding-block:clamp(48px,7vw,84px)}
.band-warm{padding-block:clamp(48px,7vw,84px);background:var(--warm)}
.hero{padding-block:clamp(52px,8vw,96px)}
.hero-grid{display:flex;gap:56px;align-items:flex-start;justify-content:space-between}
.hero-copy{max-width:680px}
.hero-mark{flex:none;padding-top:10px}
.hero-sm{padding-block:clamp(44px,6vw,84px);border-bottom:1px solid var(--rule)}
.hero-sm h1{font-size:clamp(2rem,4.6vw,3.25rem);max-width:16em}
.hero-sm h1{margin-bottom:.5em}

/* home services ---------------------------------------------------------- */
.svc-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:52px;margin-top:44px}
.svc-card{border-top:2px solid var(--ink);padding-top:22px}
.svc-card h3{font-size:1.4rem}
.svc-card p{font-size:.9375rem;color:var(--ink-soft)}

/* services detail -------------------------------------------------------- */
.svc-detail{display:grid;grid-template-columns:300px minmax(0,1fr);gap:64px;
  padding-block:48px;border-top:1px solid var(--rule)}
.svc-detail:first-child{border-top:none;padding-top:0}
.svc-detail h2{font-size:1.85rem}
.svc-detail-body>.eyebrow{margin-top:1.8em}
.step-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:40px;margin-top:40px}
.step{border-top:2px solid var(--ink);padding-top:18px}
.step h3{font-size:1.3rem;margin-bottom:.5em}
.step p{font-size:.875rem;color:var(--ink-soft)}
.band-warm .fine{margin-top:2.4em}

/* lists ------------------------------------------------------------------ */
ul.dotted{list-style:none;margin:0 0 1.2em;padding:0}
ul.dotted li{position:relative;padding:7px 0 7px 20px;font-size:.9375rem;line-height:1.6}
ul.dotted li::before{content:"";position:absolute;left:0;top:15px;width:5px;height:5px;
  background:var(--bronze)}

/* callout ---------------------------------------------------------------- */
.callout{background:var(--warm);border-left:2px solid var(--bronze);padding:18px 22px;
  margin-top:1.6em;max-width:44em}
.callout p{margin:0;font-size:.875rem;line-height:1.65}
.callout p+p{margin-top:.5em}
.callout-label{font-family:var(--mono);font-size:.5625rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--bronze-text)}
.callout-wide{max-width:none;margin-top:2.6em;padding:22px 26px}

/* two-column ------------------------------------------------------------- */
.two-col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(40px,6vw,96px);
  align-items:start}
.two-col-wide{grid-template-columns:1.25fr 1fr}
.prose p{font-size:.9688rem;line-height:1.8;margin-bottom:1.3em}
.panel{background:var(--warm);border:1px solid var(--rule);padding:30px 32px}
.panel-cta p{font-size:.9375rem}
.timeline{display:flex;flex-direction:column}
.tl-row{display:flex;gap:18px;padding:11px 0;border-bottom:1px solid var(--rule);font-size:.8125rem}
.tl-row:last-child{border-bottom:none}
.tl-yr{color:var(--bronze-text);width:80px;flex:none;font-size:.6875rem;padding-top:2px}
.principles{margin-top:32px}
.principle{display:grid;grid-template-columns:340px minmax(0,1fr);gap:44px;
  padding-block:30px;border-top:1px solid var(--rule)}
.principle h3{font-size:1.375rem}
.principle p{margin:0;font-size:.9375rem;color:var(--ink-soft);max-width:40em}

/* credentials ------------------------------------------------------------ */
.cred-group{display:grid;grid-template-columns:300px minmax(0,1fr);gap:64px;
  padding-block:36px;border-top:1px solid var(--rule)}
.cred-group:first-child{border-top:none;padding-top:0}
.cred-group h2{font-size:1.5rem}
.cred{padding:14px 0;border-bottom:1px solid var(--rule)}
.cred:last-child{border-bottom:none}
.cred-t{margin:0 0 .3em;font-size:.9375rem;font-weight:500}
.cred-d{margin:0;font-size:.8438rem;color:var(--ink-soft);line-height:1.6}

/* contact ---------------------------------------------------------------- */
.details{margin-bottom:2.4em}
.det-row{display:flex;gap:20px;padding:13px 0;border-bottom:1px solid var(--rule);font-size:.875rem}
.det-k{font-family:var(--mono);font-size:.5625rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink-soft);width:110px;flex:none;padding-top:4px}

/* dark strip + footer ---------------------------------------------------- */
.strip-dark{background:var(--ink);color:var(--paper);padding-block:clamp(44px,6vw,68px)}
.strip-inner{display:flex;gap:44px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.strip-dark h2{color:var(--paper)}
.muted-dark{color:var(--muted-dark);margin:.7em 0 0;max-width:34em;font-size:.9375rem}
.site-foot{border-top:1px solid var(--rule);padding-block:28px}
.foot-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.foot-brand{display:flex;align-items:center;gap:16px;font-size:.8125rem;color:var(--ink-soft)}

/* responsive ------------------------------------------------------------- */
@media (max-width:900px){
  .nav-desktop,.head-cta{display:none}
  .nav-mobile{display:block}
  .head-inner{align-items:flex-start}
  details[open].nav-mobile{width:100%}
  .nav-mobile{position:static}
  .hero-grid{flex-direction:column-reverse;gap:32px}
  .hero-mark{align-self:flex-start;padding-top:0}
  .svc-grid{grid-template-columns:1fr;gap:36px}
  .step-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px}
  .svc-detail,.cred-group,.principle{grid-template-columns:1fr;gap:20px}
  .two-col,.two-col-wide{grid-template-columns:1fr}
}
@media (max-width:560px){
  .brand-name{font-size:.75rem;letter-spacing:.12em}
  .step-grid{grid-template-columns:1fr}
  .btn{width:100%;text-align:center}
  .cta-row{flex-direction:column;align-items:stretch;gap:16px}
  .cta-row .link-underline{text-align:center}
  .det-row{flex-direction:column;gap:4px}
  .det-k{width:auto}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}