/* =====================================================================
   PROSPEROUS ROBOTICS — shared stylesheet
   Tokens, reset, navigation, footer and the handful of components every
   page uses. Each page keeps its own architecture in its own <style>
   block; nothing page-specific belongs in here.
   ===================================================================== */

:root{
  /* ground */
  --ink:#08243F;          /* instrument navy */
  --ink-deep:#04162A;     /* full bleed */
  --ink-warm:#14110F;     /* documentary black, field notes only */
  --paper:#F2F0EC;        /* warm paper */
  --paper-pure:#FBFAF8;
  --paper-warm:#FBF7EF;   /* the daily page */
  --bone:#EDE7DC;

  /* accents */
  --rose:#D0112B;         /* the logo red */
  --rose-deep:#A60D22;
  --rose-lift:#F0324B;
  --cyan:#00B0F0;
  --cyan-deep:#0078A8;
  --sun:#E39A12;
  --green:#1B7F4C;

  /* text */
  --ink-2:#38485A;
  --dim:#5E6B78;
  --dim-dark:#8FA6BC;
  --on-dark:#EAF1F8;

  /* lines */
  --rule:rgba(8,36,63,.16);
  --rule-hard:#0B1E31;
  --rule-dark:rgba(255,255,255,.18);

  --display:"Newsreader",Georgia,"Times New Roman",serif;
  --ui:"Public Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --gut:clamp(20px,5vw,72px);
  --nav-h:62px;
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--ui);font-size:17px;line-height:1.62;
  -webkit-font-smoothing:antialiased;overflow-x:hidden}

img{max-width:100%;display:block;height:auto}
h1,h2,h3{font-family:var(--display);font-weight:400;line-height:1.06;margin:0;
  text-wrap:balance;letter-spacing:-.02em}
p{margin:0 0 1.1em}
a{color:inherit}
:focus-visible{outline:2px solid var(--rose);outline-offset:4px}

.wrap{width:100%;max-width:1220px;margin-inline:auto;padding-inline:var(--gut)}
.narrow{max-width:62ch}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

.skip{position:absolute;left:-9999px;top:0;z-index:100;background:var(--ink);color:#fff;
  padding:12px 20px;font-weight:600}
.skip:focus{left:8px;top:8px}

.eyebrow{font-family:var(--ui);font-size:.68rem;font-weight:700;letter-spacing:.2em;
  text-transform:uppercase;margin:0 0 20px}

/* measurement motif, used as a rule on several pages */
.ticks{height:13px;width:100%;
  background-image:repeating-linear-gradient(to right,currentColor 0 1px,transparent 1px 13px);
  opacity:.28}

/* ---------------------------------------------------------------
   navigation
   --------------------------------------------------------------- */
.nav{position:sticky;top:0;z-index:40;background:var(--paper-pure);
  border-bottom:1px solid var(--rule)}
.nav--dark{background:var(--ink-deep);border-bottom-color:var(--rule-dark)}
.nav__in{display:flex;align-items:center;justify-content:space-between;gap:20px;
  min-height:var(--nav-h)}
.nav__brand{display:flex;align-items:center;gap:11px;text-decoration:none;flex:none}
.nav__brand img{width:30px;height:30px}
.nav__brand b{font-family:var(--display);font-weight:400;font-size:1.06rem;letter-spacing:-.01em;
  white-space:nowrap}
.nav--dark .nav__brand b{color:#fff}

.nav__links{display:flex;flex-wrap:wrap;align-items:center;gap:2px;margin:0;padding:0;list-style:none}
.nav__links a{font-family:var(--ui);font-size:.86rem;font-weight:500;text-decoration:none;
  color:var(--ink-2);padding:8px 11px;border-radius:2px;white-space:nowrap;
  transition:color .15s,background .15s}
.nav__links a:hover{color:var(--ink);background:rgba(8,36,63,.05)}
.nav__links a[aria-current="page"]{color:var(--rose);font-weight:600}
.nav--dark .nav__links a{color:var(--dim-dark)}
.nav--dark .nav__links a:hover{color:#fff;background:rgba(255,255,255,.08)}
.nav--dark .nav__links a[aria-current="page"]{color:var(--cyan)}

.nav__toggle{display:none;background:none;border:1px solid var(--rule);border-radius:2px;
  padding:8px 13px;font-family:var(--ui);font-size:.78rem;font-weight:700;letter-spacing:.09em;
  text-transform:uppercase;color:var(--ink);cursor:pointer}
.nav--dark .nav__toggle{border-color:var(--rule-dark);color:#fff}

@media(max-width:900px){
  .nav__toggle{display:block}
  .nav__links{position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;
    gap:0;background:var(--paper-pure);border-bottom:1px solid var(--rule);padding:6px 0 12px;
    display:none}
  .nav--dark .nav__links{background:var(--ink-deep);border-bottom-color:var(--rule-dark)}
  .nav__links.open{display:flex}
  .nav__links a{padding:13px var(--gut);border-radius:0}
  .nav__in{position:relative}
}

/* ---------------------------------------------------------------
   buttons
   --------------------------------------------------------------- */
.btn{display:inline-block;font-family:var(--ui);font-weight:700;font-size:1rem;
  letter-spacing:.01em;padding:16px 32px;border-radius:2px;text-decoration:none;border:1px solid transparent;
  cursor:pointer;transition:background .17s,color .17s,border-color .17s,transform .17s}
.btn--primary{background:var(--rose);color:#fff}
.btn--primary:hover{background:var(--rose-deep);transform:translateY(-1px)}
.btn--ghost{background:none;color:var(--ink);border-color:var(--rule)}
.btn--ghost:hover{border-color:var(--ink)}
/* ghost buttons on any dark ground. Dark heroes often do not carry a
   .section--dark class, so those are named explicitly by each page. */
.on-dark .btn--ghost{color:#fff;border-color:rgba(255,255,255,.42)}
.on-dark .btn--ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}

/* ---------------------------------------------------------------
   footer
   --------------------------------------------------------------- */
.foot{background:var(--ink-deep);color:var(--dim-dark);
  padding-block:clamp(44px,6vw,74px) clamp(28px,4vw,44px);font-size:.9rem}
.foot a{color:var(--on-dark);text-decoration:none}
.foot a:hover{text-decoration:underline;text-underline-offset:3px}
.foot__top{display:grid;gap:34px;grid-template-columns:minmax(0,1fr)}
@media(min-width:800px){.foot__top{grid-template-columns:1.3fr 1fr 1fr;gap:48px}}
.foot__brand img{width:38px;height:38px;margin-bottom:16px}
.foot__brand p{max-width:34ch;color:var(--dim-dark)}
.foot h4{font-family:var(--ui);font-size:.66rem;font-weight:700;letter-spacing:.16em;
  text-transform:uppercase;color:#fff;margin:0 0 14px}
.foot ul{list-style:none;margin:0;padding:0}
.foot li{margin-bottom:9px}
.foot__legal{border-top:1px solid var(--rule-dark);margin-top:clamp(32px,4vw,52px);padding-top:22px;
  display:flex;flex-wrap:wrap;gap:8px 28px;justify-content:space-between;font-size:.82rem}
.foot__ents{max-width:70ch}

/* ---------------------------------------------------------------
   reveal on scroll, from a visible resting state so the page is
   readable even if JavaScript never runs
   --------------------------------------------------------------- */
.rise{opacity:1;transform:none}
@media(prefers-reduced-motion:no-preference){
  .js .rise{opacity:0;transform:translateY(18px);
    transition:opacity .75s cubic-bezier(.22,.8,.3,1),transform .75s cubic-bezier(.22,.8,.3,1)}
  .js .rise.in{opacity:1;transform:none}
}

/* ---------------------------------------------------------------
   small shared pieces
   --------------------------------------------------------------- */
.src{font-size:.76rem;color:var(--dim);margin-top:20px}
.tag{display:inline-block;font-family:var(--ui);font-size:.68rem;font-weight:700;
  letter-spacing:.13em;text-transform:uppercase;padding:5px 11px;border:1px solid currentColor;
  color:var(--rose)}
.form-status{margin-top:16px;font-size:.92rem}
.form-status--ok{color:var(--green)}
.form-status--err{color:var(--rose)}