/* ============================================================
   JOTWIND — Jotchua Wind Tunnel
   Test Bay 09 · polished-tile field, cobalt structure,
   LED cyan reserved for measured air, hazard orange for action.
   ============================================================ */

:root{
  /* surfaces — polished tunnel tile */
  --tile:#EDF1F6;
  --tile-2:#E3EAF2;
  --tile-3:#D2DCE7;
  --white:#FBFDFF;

  /* ink */
  --ink:#0C1622;
  --ink-2:#3B4B5E;
  --ink-3:#71828F;

  /* cobalt — structure: panels, bands, solid display type */
  --cobalt:#0B3FBF;
  --cobalt-2:#0A2E86;
  --cobalt-3:#061C56;

  /* LED cyan — MEASUREMENT ONLY (strips, streamlines, telemetry) */
  --led:#12CFE8;
  --led-2:#7CE9F7;

  /* hazard orange — WARNINGS + ACTIONS ONLY */
  --hazard:#FF5A1F;
  --hazard-2:#FF8B52;
  --hazard-3:#C93B08;

  /* the specimen */
  --fur:#EFDCB8;

  --ff-d:'Kanit',Impact,Haettenschweiler,system-ui,sans-serif;
  --ff-b:'Public Sans',ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif;
  --ff-m:'Overpass Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --r:14px;
  --r-s:8px;
  --shadow:0 1px 0 #fff inset, 0 10px 30px -18px rgba(6,28,86,.55);
  --shadow-lift:0 1px 0 #fff inset, 0 26px 50px -26px rgba(6,28,86,.6);
  --pad:clamp(18px,4vw,34px);
  --maxw:1240px;

  /* live wind — set by JS, 0 .. 1 */
  --wind:0;
}

*,*::before,*::after{box-sizing:border-box}
html{
  overflow-x:clip;
  scroll-behavior:smooth;
  scroll-padding-top:88px;
  -webkit-text-size-adjust:100%;
}
body{
  margin:0;
  background:var(--tile);
  color:var(--ink);
  font-family:var(--ff-b);
  font-size:16.5px;
  line-height:1.62;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit}
button{font:inherit;color:inherit}
::selection{background:var(--cobalt);color:#fff}

@supports (scrollbar-color: auto){
  html{scrollbar-color:var(--cobalt) var(--tile-3);scrollbar-width:thin}
}
::-webkit-scrollbar{width:11px;height:11px}
::-webkit-scrollbar-track{background:var(--tile-3)}
::-webkit-scrollbar-thumb{background:var(--cobalt);border:3px solid var(--tile-3);border-radius:99px}

/* ---------- primitives ---------- */
.wrap{width:min(100% - 2*var(--pad),var(--maxw));margin-inline:auto}
.section{position:relative;padding:clamp(64px,10vw,124px) 0}
.eyebrow{
  font-family:var(--ff-m);font-size:11.5px;font-weight:600;
  letter-spacing:.3em;text-transform:uppercase;color:var(--ink-3);
  display:flex;align-items:center;gap:12px;margin:0 0 18px;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--cobalt);flex:none}
h1,h2,h3,h4{font-family:var(--ff-d);font-weight:800;line-height:.95;margin:0;letter-spacing:-.015em}
h2{font-size:clamp(34px,5.4vw,66px);text-transform:uppercase}
h3{font-size:clamp(19px,2.3vw,27px);text-transform:uppercase}
.lede{font-size:clamp(16.5px,1.5vw,19.5px);color:var(--ink-2);max-width:62ch}
.mono{font-family:var(--ff-m);font-variant-numeric:tabular-nums}
.slant{font-style:italic}
.hide{display:none !important}

/* seam-lined tunnel background for light sections */
.seams::before{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:0;
  background:
    repeating-linear-gradient(90deg,rgba(11,63,191,.055) 0 1px,transparent 1px 96px),
    repeating-linear-gradient(0deg,rgba(11,63,191,.032) 0 1px,transparent 1px 96px);
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 12%,#000 88%,transparent);
          mask-image:linear-gradient(180deg,transparent,#000 12%,#000 88%,transparent);
}
.section > .wrap{position:relative;z-index:1}

/* ---------- buttons ---------- */
.btn{
  --bg:var(--ink);--fg:#fff;
  position:relative;display:inline-flex;align-items:center;gap:10px;
  padding:14px 22px;border:0;border-radius:99px;background:var(--bg);color:var(--fg);
  font-family:var(--ff-m);font-weight:700;font-size:13px;letter-spacing:.14em;text-transform:uppercase;
  text-decoration:none;cursor:pointer;overflow:hidden;
  transition:transform .22s cubic-bezier(.2,.9,.3,1),box-shadow .22s,background .22s,border-color .22s;
  box-shadow:0 10px 22px -14px rgba(12,22,34,.9);
}
.btn svg{width:15px;height:15px;flex:none}
.btn::after{
  content:"";position:absolute;top:0;left:-45%;width:34%;height:100%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.34),transparent);
  transform:skewX(-22deg);transition:left .55s ease;
}
.btn:hover{transform:translateX(3px) translateY(-2px)}
.btn:hover::after{left:135%}
.btn--go{--bg:var(--hazard);--fg:#2A0C00;box-shadow:0 12px 26px -14px rgba(255,90,31,.95)}
.btn--go:hover{--bg:var(--hazard-2)}
.btn--ghost{--bg:transparent;--fg:var(--ink);border:1.5px solid var(--tile-3);box-shadow:none}
.btn--ghost:hover{--bg:var(--white);border-color:var(--cobalt)}
.btn--dark{--bg:rgba(255,255,255,.08);--fg:#fff;border:1.5px solid rgba(255,255,255,.26);box-shadow:none}
.btn--dark:hover{--bg:rgba(255,255,255,.16)}
:where(a,button,input,summary,[tabindex]):focus-visible{
  outline:3px solid var(--hazard);outline-offset:3px;border-radius:6px;
}

/* ---------- preloader ---------- */
#pre{
  position:fixed;inset:0;z-index:9999;background:var(--cobalt-3);color:#fff;
  display:grid;place-items:center;
  transition:opacity .55s ease,visibility .55s;
}
#pre.done{opacity:0;visibility:hidden}
.pre-in{width:min(88vw,440px);text-align:center}
.pre-fan{width:84px;height:84px;margin:0 auto 24px}
.pre-fan svg{width:100%;height:100%;animation:spool 1.4s linear infinite}
@keyframes spool{to{transform:rotate(360deg)}}
.pre-num{
  font-family:var(--ff-d);font-style:italic;font-weight:800;
  font-size:clamp(44px,11vw,80px);line-height:1;letter-spacing:-.02em;
}
.pre-num span{font-family:var(--ff-m);font-size:.22em;font-style:normal;letter-spacing:.2em;opacity:.7;margin-left:.4em}
.pre-bar{height:4px;background:rgba(255,255,255,.16);border-radius:99px;overflow:hidden;margin:22px 0 14px}
.pre-bar i{display:block;height:100%;width:0;background:var(--led);box-shadow:0 0 16px var(--led)}
.pre-txt{font-family:var(--ff-m);font-size:11px;letter-spacing:.3em;text-transform:uppercase;opacity:.62}

/* ---------- velocity rail ---------- */
#rail{position:fixed;top:0;left:0;height:3px;width:100%;z-index:999;pointer-events:none}
#rail i{display:block;height:100%;width:0;background:var(--led);box-shadow:0 0 12px var(--led)}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:900;background:rgba(237,241,246,.88);border-bottom:1px solid var(--tile-3)}
@supports ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){
  .nav{-webkit-backdrop-filter:saturate(150%) blur(12px);backdrop-filter:saturate(150%) blur(12px)}
}
.nav-in{display:flex;align-items:center;gap:16px;height:66px}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-family:var(--ff-d);font-weight:800}
.brand img{width:34px;height:34px;border-radius:9px;border:1px solid var(--tile-3)}
.brand b{font-size:19px;letter-spacing:-.01em}
.brand i{
  font-family:var(--ff-m);font-style:normal;font-size:10px;font-weight:600;letter-spacing:.16em;
  color:var(--cobalt);border:1px solid rgba(11,63,191,.32);border-radius:5px;padding:2px 6px;
}
.nav-links{display:flex;gap:2px;margin-left:auto}
.nav-links a{
  font-family:var(--ff-m);font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;
  text-decoration:none;color:var(--ink-2);padding:9px 11px;border-radius:8px;
  transition:color .18s,background .18s;
}
.nav-links a:hover{color:var(--cobalt);background:rgba(11,63,191,.07)}
.nav .btn{padding:11px 16px;font-size:11.5px}
.burger{
  display:none;margin-left:auto;width:44px;height:38px;border:1px solid var(--tile-3);
  border-radius:9px;background:var(--white);cursor:pointer;align-items:center;justify-content:center;
}
.burger span{display:block;width:18px;height:2px;background:var(--ink);position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink)}
.burger span::before{top:-6px}
.burger span::after{top:6px}
.nav-drop{
  display:none;position:absolute;top:100%;left:0;right:0;
  background:var(--white);border-bottom:1px solid var(--tile-3);
  padding:10px var(--pad) 18px;box-shadow:0 24px 40px -28px rgba(6,28,86,.7);
}
.nav-drop.open{display:block}
.nav-drop a{
  display:block;padding:13px 4px;text-decoration:none;border-bottom:1px solid var(--tile-2);
  font-family:var(--ff-m);font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-2);
}
.nav-drop .btn{margin-top:14px;width:100%;justify-content:center}