/* ============================================================
   CAUS — BASE (design tokens, reset, nav, buttons, mega menu)
   Extracted verbatim from the original single-file build.
============================================================ */

/* ============================================================
   CAUS — DESIGN TOKENS
============================================================ */
:root{
  --navy-950:#060a10;
  --navy-900:#0a121c;
  --navy-800:#0f1c2b;
  --navy-700:#152538;
  --navy-600:#1c3148;
  --steel-500:#425a6b;
  --steel-300:#8fa3ae;
  --paper:#f3f4f1;
  --paper-dim:#e8e9e4;
  --white:#ffffff;
  --ink:#0a0e13;
  --ink-soft:#3a4147;
  --gray-500:#6d7680;
  --gray-400:#9aa2a8;
  --line:rgba(10,14,19,0.10);
  --line-dark:rgba(255,255,255,0.12);

  --blue-deep:#043a6b;
  --blue:#0a6fae;
  --blue-bright:#1f9bd8;
  --cyan:#39c3f2;
  --green:#6bbf3a;
  --green-dark:#4f9c2a;

  --ease-eng: cubic-bezier(.65,0,.15,1);
  --ease-out: cubic-bezier(.16,.84,.44,1);
  --dur-s: .45s;
  --dur-m: .8s;
  --dur-l: 1.4s;

  --nav-h: 84px;
  --container: 1440px;
  --gutter: clamp(20px, 4vw, 64px);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:auto;}
html,body{margin:0;padding:0;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:'Inter',-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
  width:100%;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;}
svg{display:block;}
.mono{font-family:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;}

::selection{background:var(--blue-bright);color:#fff;}

/* scrollbar (webkit) — restrained */
::-webkit-scrollbar{width:10px;}
::-webkit-scrollbar-track{background:var(--paper);}
::-webkit-scrollbar-thumb{background:#c7cac3;border-radius:0;}
::-webkit-scrollbar-thumb:hover{background:#aeb2a8;}

.wrap{
  max-width:var(--container);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}

.eyebrow{
  font-family:'JetBrains Mono',monospace;
  font-size:11.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  font-weight:500;
  display:flex;
  align-items:center;
  gap:10px;
}
.eyebrow::before{
  content:"";
  width:24px;height:1px;
  background:currentColor;
  opacity:.55;
  display:inline-block;
}
.eyebrow.on-dark{color:var(--cyan);}
.eyebrow.on-light{color:var(--blue);}

h1,h2,h3,h4{margin:0;font-weight:600;letter-spacing:-0.01em;}
p{margin:0;}

.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.04em;
  text-transform:uppercase;
  padding:16px 26px;
  border:1px solid transparent;
  white-space:nowrap;
  transition:background var(--dur-s) var(--ease-out), color var(--dur-s) var(--ease-out), border-color var(--dur-s) var(--ease-out), transform var(--dur-s) var(--ease-out);
}
.btn svg{width:14px;height:14px;transition:transform var(--dur-s) var(--ease-out);}
.btn:hover svg{transform:translateX(4px);}
.btn-primary{background:var(--cyan);color:var(--navy-950);}
.btn-primary:hover{background:#fff;}
.btn-ghost-dark{border-color:rgba(255,255,255,0.32);color:#fff;}
.btn-ghost-dark:hover{border-color:#fff;background:rgba(255,255,255,0.08);}
.btn-ghost-light{border-color:rgba(10,14,19,0.28);color:var(--ink);}
.btn-ghost-light:hover{border-color:var(--ink);background:rgba(10,14,19,0.05);}
.btn-line{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12.5px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;
  padding-bottom:4px;border-bottom:1px solid currentColor;
}
.btn-line svg{width:13px;height:13px;transition:transform var(--dur-s) var(--ease-out);}
.btn-line:hover svg{transform:translateX(4px);}
@media (max-width:900px){
  /* .btn-line is a text link (underline, no button chrome by design) —
     its visible row is just the text + 4px underline gap, well under a
     comfortable tap height. Growing the box via min-height on its
     existing inline-flex centers the text in a taller invisible hit
     area instead of inflating the type or adding a button-like fill. */
  .btn-line{min-height:44px;}
}

/* ============================================================
   NAV
============================================================ */
#nav{
  position:fixed;top:0;left:0;right:0;z-index:900;
  height:var(--nav-h);
  display:flex;align-items:center;
  transition:background var(--dur-m) var(--ease-out), border-color var(--dur-m) var(--ease-out), height var(--dur-m) var(--ease-out), backdrop-filter var(--dur-m);
  border-bottom:1px solid transparent;
}
#nav .wrap{width:100%;display:flex;align-items:center;justify-content:space-between;gap:32px;}
#nav.solid{
  background:rgba(6,10,16,0.82);
  backdrop-filter:blur(16px) saturate(140%);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  border-bottom-color:rgba(255,255,255,0.09);
  height:72px;
}
#nav.on-light{background:rgba(243,244,241,0.86);border-bottom-color:var(--line);}
#nav.on-light.solid{background:rgba(243,244,241,0.92);}

.nav-logo{display:flex;align-items:center;height:30px;}
.nav-logo img{height:100%;width:auto;}

.nav-links{display:flex;align-items:center;gap:40px;list-style:none;margin:0;padding:0;}
.nav-links li{position:relative;}
.nav-links a{
  font-size:13px;font-weight:500;letter-spacing:.03em;text-transform:uppercase;
  color:rgba(255,255,255,0.82);
  padding:8px 0;
  position:relative;
}
#nav.on-light .nav-links a{color:rgba(10,14,19,0.72);}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;
  background:currentColor;transition:width var(--dur-s) var(--ease-out);
}
.nav-links a:hover::after{width:100%;}
.nav-links a:hover{color:#fff;}
#nav.on-light .nav-links a:hover{color:var(--ink);}

.nav-right{display:flex;align-items:center;gap:20px;}

/* Language switch -- raised to a visible chip control (was two bare
   letters) so an English-speaking visitor actually notices they can
   switch, instead of reading it as decorative punctuation. */
.lang-switch{
  display:flex;align-items:center;gap:2px;font-family:'JetBrains Mono',monospace;
  font-size:12.5px;letter-spacing:.03em;
  border:1px solid rgba(255,255,255,0.32);
  background:rgba(255,255,255,0.06);
  padding:3px;
}
#nav.on-light .lang-switch{border-color:rgba(10,14,19,0.22);background:rgba(10,14,19,0.04);}
.lang-switch button{
  background:none;border:none;color:rgba(255,255,255,0.62);font-weight:600;
  padding:6px 11px;transition:background var(--dur-s) var(--ease-out), color var(--dur-s) var(--ease-out);
}
#nav.on-light .lang-switch button{color:rgba(10,14,19,0.55);}
.lang-switch button:hover{color:#fff;}
#nav.on-light .lang-switch button:hover{color:var(--ink);}
.lang-switch button.active{background:var(--cyan);color:var(--navy-950);}
#nav.on-light .lang-switch button.active{background:var(--blue);color:#fff;}
.lang-switch .divider{display:none;}

/* Project Inquiry CTA -- filled and lightly glowing instead of a thin
   ghost outline, so the primary conversion action reads as a button,
   not another nav link. */
.nav-cta{
  font-size:12.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  color:var(--navy-950);background:var(--cyan);border:1px solid var(--cyan);
  padding:12px 20px;display:flex;align-items:center;gap:8px;
  box-shadow:0 2px 18px rgba(57,195,242,.35);
  transition:all var(--dur-s) var(--ease-out);
}
.nav-cta:hover{background:#fff;border-color:#fff;color:var(--navy-950);box-shadow:0 4px 24px rgba(57,195,242,.55);transform:translateY(-1px);}
#nav.on-light .nav-cta{color:var(--navy-950);background:var(--cyan);border-color:var(--cyan);}
#nav.on-light .nav-cta:hover{background:var(--ink);border-color:var(--ink);color:#fff;}
.nav-cta svg{width:12px;height:12px;}

.nav-burger{display:none;flex-direction:column;gap:5px;background:none;border:none;padding:6px;align-items:center;justify-content:center;min-width:44px;min-height:44px;}
.nav-burger span{width:22px;height:1.5px;background:#fff;display:block;}
#nav.on-light .nav-burger span{background:var(--ink);}

/* nav dropdown tabs -- Solutions / Engineering / Industries open on
   hover (a plain CSS :hover on the whole <li>, so moving the pointer
   onto the panel itself keeps it open too); a click still works as a
   fallback for keyboard/touch. Each .nav-drop <li> holds a toggle
   link and a .mega panel carrying that topic's content, relocated
   here from what used to be its own full-page homepage section. */
.nav-drop{position:relative;}
.nav-drop-toggle{display:flex;align-items:center;gap:6px;}
.nav-drop-toggle::after{
  content:"";width:7px;height:7px;margin-top:-3px;
  border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;
  transform:rotate(45deg);opacity:.6;transition:transform var(--dur-s) var(--ease-out);
}
.nav-drop.open .nav-drop-toggle::after,.nav-drop:hover .nav-drop-toggle::after{transform:rotate(-135deg);}

/* .mega is the hoverable hit-area only -- no visible chrome here.
   padding-top (instead of a margin gap) extends that hit-area all the
   way up to the toggle, so moving the pointer straight down from
   "ÇÖZÜMLER" into the card never crosses a dead zone and drops the
   hover state. The actual visible card is .mega-inner, positioned
   below that invisible bridge. */
.mega{
  position:absolute;top:100%;left:0;padding-top:10px;
  opacity:0;visibility:hidden;pointer-events:none;
  transform:translateY(7px);
  transition:opacity .24s cubic-bezier(.16,1,.3,1), transform .24s cubic-bezier(.16,1,.3,1), visibility .24s;
}
.nav-drop.open .mega,.nav-drop:hover .mega{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0);}

.mega-solutions{left:0;width:min(340px,calc(100vw - 48px));}
.mega-engineering{left:0;width:min(360px,calc(100vw - 48px));}
.mega-industries{right:0;width:min(360px,calc(100vw - 48px));}

/* The card itself: near-black engineered surface, hairline border,
   small radius, precise shadow -- not a floating generic card. A
   thin cyan tick at the top stays aligned with the triggering label. */
.mega-inner{
  position:relative;
  background:linear-gradient(180deg,rgba(13,19,27,.98),rgba(7,10,15,.99));
  border:1px solid rgba(255,255,255,.09);
  border-radius:6px;
  box-shadow:0 30px 60px -12px rgba(0,0,0,.55), 0 2px 10px rgba(0,0,0,.35);
  padding:10px 0;
  max-height:calc(100vh - var(--nav-h) - 40px);
  overflow-y:auto;
}
.mega-inner::before{
  content:"";position:absolute;top:0;left:26px;width:26px;height:2px;
  background:var(--cyan);
}
.dd-head{padding:14px 24px 10px;}
.dd-head .eyebrow{margin-bottom:0;}

/* Solutions -- interactive rows: number, title, arrow. Hover shifts
   the row background, lights the number to cyan, brightens the text
   to full white, and slides the arrow in from the left. */
.dd-list{display:flex;flex-direction:column;padding:2px 12px;}
.dd-row{
  position:relative;display:flex;align-items:center;gap:13px;
  padding:12px 12px;border-radius:3px;
  border-bottom:1px solid rgba(255,255,255,.06);
  color:rgba(255,255,255,.68);
  transition:color .22s cubic-bezier(.16,1,.3,1), background .22s cubic-bezier(.16,1,.3,1);
}
.dd-list .dd-row:last-child{border-bottom:none;}
.dd-row::before{
  content:"";position:absolute;left:0;top:6px;bottom:6px;width:2px;
  background:var(--cyan);transform:scaleY(0);transform-origin:center;
  transition:transform .22s cubic-bezier(.16,1,.3,1);
}
.dd-row-n{flex:none;font-size:10px;color:rgba(255,255,255,.32);letter-spacing:.03em;transition:color .22s cubic-bezier(.16,1,.3,1);}
.dd-row-t{flex:1;font-size:13.5px;font-weight:500;letter-spacing:.005em;}
.dd-row-arrow{flex:none;width:13px;height:13px;color:var(--cyan);opacity:0;transform:translateX(-5px);transition:opacity .22s cubic-bezier(.16,1,.3,1), transform .22s cubic-bezier(.16,1,.3,1);}
a.dd-row:hover{color:#fff;background:rgba(57,195,242,.06);}
a.dd-row:hover::before{transform:scaleY(1);}
a.dd-row:hover .dd-row-n{color:var(--cyan);}
a.dd-row:hover .dd-row-arrow{opacity:1;transform:translateX(0);}

/* Engineering / Industries -- same numbered-row language, informational
   (not links), so no arrow / hover-shift. */
.dd-row.dd-row-static{cursor:default;}

@media (max-width:1080px){
  .mega-industries{right:auto;}
}

/* mobile: the SAME panel node is relocated (portalled) into the
   matching .mn-drop-body inside #mobile-nav instead of being
   duplicated -- this override makes it read as an inline accordion
   body rather than a floating dropdown card. */
.mega.mega-mobile{
  position:static;opacity:1;visibility:visible;pointer-events:auto;transform:none;
  width:100%;max-width:none;padding-top:0;margin-top:0;
}
.mega.mega-mobile .mega-inner{
  background:transparent;border:none;box-shadow:none;border-radius:0;
  padding:2px 0 22px;max-height:none;overflow:visible;
}
.mega.mega-mobile .mega-inner::before{display:none;}
.mega.mega-mobile .dd-head{padding:0 0 10px;}
.mega.mega-mobile .dd-list{padding:0;}

@media (max-width:1080px){
  .nav-links{display:none;}
  .nav-burger{display:flex;}
  .nav-right .lang-switch{display:none;}
}