/* ==========================================================================
   RASAD — public surface foundation.

   Loaded by every page a visitor can reach before signing in: the landing
   page, the sign-in and registration pages, and the error pages. Holds only
   what all of them share — palette, reset, shell, type, brand, buttons, the
   ground footer. Page-specific rules live beside this file, one sheet per page.

   The palette is semantic rather than decorative: cyan is instrument and
   measurement, amber is what the beam found, and the footer is the ground
   exactly as the platform draws it.
   ========================================================================== */

:root{
  /* atmosphere */
  --void:#031015; --deep:#05171e; --mid:#061d25; --panel:#0a2029; --panel-2:#0d2934;
  --line:rgba(124,198,203,.13); --line-2:rgba(124,198,203,.26);
  /* ink */
  --fg:#e8f4f4; --fg-2:#a2bfc2; --fg-3:#68878c; --fg-4:#496166;
  /* the two ends of the colour ramp: instrument, and what it finds */
  --cyan:#2dd1cf; --cyan-hi:#7ef2ea; --cyan-lo:#0a8f95;
  --amber:#f0a93f; --amber-hi:#f7cf85;
  /* the ground, exactly as the platform draws it */
  --ground:#7f2b0a; --ground-deep:#2a0d04; --ground-ink:#f4ddd1; --ground-ink-2:#cba491;

  --rail:78px;
  --shell:1180px;
  --sans:"IBM Plex Sans",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --disp:"Archivo","Archivo Expanded",var(--sans);
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--void);color:var(--fg-2);
  font:400 16.5px/1.68 var(--sans);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
[hidden]{display:none}
a{color:inherit;text-decoration:none}
::selection{background:rgba(45,209,207,.26);color:#fff}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:3px}

/* the sky column: one gradient for the whole document, space at the top,
   the horizon warming just before the ground */
.sky{
  position:relative;
  background:
    radial-gradient(1200px 620px at 78% 96%, rgba(240,169,63,.15), transparent 62%),
    radial-gradient(900px 520px at 12% 4%, rgba(45,209,207,.055), transparent 60%),
    linear-gradient(180deg,
      var(--void) 0%, var(--deep) 22%, var(--mid) 48%,
      #07222b 70%, #0d2a2d 84%, #1b3028 92%, #33301e 97%, #4a2a13 100%);
}

/* ── shell ───────────────────────────────────────────────────────────────── */
.wrap{max-width:var(--shell);margin:0 auto;padding:0 30px}
section{position:relative}
.band{padding:clamp(72px,10vw,132px) 0}
.band + .band{border-top:1px solid var(--line)}

/* ── type ────────────────────────────────────────────────────────────────── */
h1,h2,h3{font-family:var(--disp);color:var(--fg);font-weight:700;letter-spacing:-.028em;line-height:1.02}
h1{font-size:clamp(2.45rem,5.9vw,4.8rem);font-stretch:112%;line-height:.97;letter-spacing:-.038em}
h2{font-size:clamp(1.8rem,3.7vw,2.85rem);font-stretch:108%;line-height:1.06}
h3{font-size:1.02rem;font-stretch:104%;font-weight:600;letter-spacing:-.012em}
p{max-width:64ch}
.lede{font-size:clamp(1.02rem,1.5vw,1.16rem);color:var(--fg-2);line-height:1.66}
.lede b,.lede strong{color:var(--fg);font-weight:600}

/* ── brand ───────────────────────────────────────────────────────────────── */
/* One mark, coloured by the band it sits in: cyan and amber in the sky,
   sunlit clay once the page has landed on the ground. */
.mark{width:26px;height:26px;flex:none}
.mark-globe{stroke:var(--cyan)}
.mark-orbit{stroke:var(--fg)}
.f-brand .mark-globe{stroke:var(--ground-ink);opacity:.62}
.f-brand .mark-orbit{stroke:var(--ground-ink)}
.brand{display:flex;align-items:center;gap:11px;flex:none}
.brand b{
  font-family:var(--disp);font-stretch:78%;font-weight:700;font-size:.82rem;
  letter-spacing:.19em;text-transform:uppercase;color:var(--fg);
}
/* Supplied lockup: it carries its own wordmark, so it replaces mark and text
   together and only has to be given a height. */
.brand-art{display:block;height:28px;width:auto}
.f-brand .brand-art{height:26px}

/* ── buttons ─────────────────────────────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;gap:11px;
  font-family:var(--mono);font-size:.8rem;font-weight:500;letter-spacing:.06em;
  padding:14px 22px;border-radius:3px;border:1px solid transparent;white-space:nowrap;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),background .22s,color .22s,border-color .22s;
}
.btn svg{width:14px;height:14px;transition:transform .22s var(--ease)}
.btn:hover svg{transform:translateX(4px)}
.btn-go{background:var(--cyan);color:#032023;font-weight:600;box-shadow:0 0 0 rgba(45,209,207,0)}
.btn-go:hover{background:var(--cyan-hi);box-shadow:0 10px 34px -12px rgba(45,209,207,.75);transform:translateY(-1px)}
.btn-quiet{border-color:var(--line-2);color:var(--fg-2)}
.btn-quiet:hover{border-color:var(--cyan-lo);color:var(--fg);background:rgba(45,209,207,.06)}
.btn-sm{padding:11px 17px;font-size:.74rem}

/* ── ground / footer ─────────────────────────────────────────────────────── */
.ground{position:relative;background:linear-gradient(180deg,var(--ground) 0%,#5a1d06 34%,var(--ground-deep) 100%);color:var(--ground-ink-2)}
.ground-line{position:absolute;left:0;right:0;top:-1px;transform:translateY(-99%);width:100%;height:90px;max-width:none;pointer-events:none}
.ground-in{position:relative;padding:64px 0 34px}
.f-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:44px}
.f-brand{display:flex;align-items:center;gap:11px;margin-bottom:16px}
.f-brand b{font-family:var(--disp);font-stretch:78%;font-weight:700;font-size:.82rem;letter-spacing:.19em;text-transform:uppercase;color:var(--ground-ink)}
.f-grid p{font-size:.88rem;color:var(--ground-ink-2);max-width:34ch;line-height:1.6}
.f-grid h4{font-family:var(--mono);font-size:.7rem;letter-spacing:.15em;text-transform:uppercase;color:rgba(244,221,209,.66);margin-bottom:14px;font-weight:500}
.f-grid ul{list-style:none;display:grid;gap:9px}
.f-grid ul a{font-size:.87rem;color:var(--ground-ink-2);transition:color .2s}
.f-grid ul a:hover{color:var(--ground-ink)}
.f-grid ul span{font-size:.87rem;color:rgba(203,164,145,.6)}
.f-base{
  margin-top:52px;padding-top:22px;border-top:1px solid rgba(244,221,209,.14);
  display:flex;flex-wrap:wrap;gap:12px 30px;
  font-family:var(--mono);font-size:.72rem;letter-spacing:.03em;color:rgba(203,164,145,.86);
}
.f-base span:last-child{margin-left:auto}

/* ── reveal ──────────────────────────────────────────────────────────────── */
.up{opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.up.in{opacity:1;transform:none}
.up.d1{transition-delay:.08s}.up.d2{transition-delay:.16s}.up.d3{transition-delay:.24s}

/* ── responsive ──────────────────────────────────────────────────────────── */
@media (max-width:900px){
  .f-grid{grid-template-columns:1fr 1fr;gap:34px}
}
@media (max-width:640px){
  .wrap{padding:0 20px}
  body{font-size:15.5px}
  .brand b{font-size:.74rem;letter-spacing:.16em}
  .f-grid{grid-template-columns:1fr}
  .f-base span:last-child{margin-left:0}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important}
  .up{opacity:1;transform:none}
}