/* ============================================================
   Bit2Byte Solutions — Design System
   Serif-editorial, brand-blue, energetic-but-disciplined
   ============================================================ */

/* ---- Fonts ---- */
@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@1&display=swap');

/* ---- Tokens ---- */
:root{
  --ink:        #0C1418;   /* primary text */
  --ink-2:      #475560;   /* muted text */
  --ink-3:      #7C8893;   /* faint text */
  --paper:      #FFFFFF;
  --mist:       #EEF5FA;   /* light blue-tinted section bg */
  --mist-2:     #F7FBFD;
  --line:       #DEE8EE;   /* hairlines */
  --line-2:     #EAF0F4;

  --blue:       #4EADE2;   /* brand */
  --blue-deep:  #2C88BC;   /* brand, darker (text/hover on light) */
  --blue-ink:   #1C6CA0;
  --navy:       #0E2A3F;   /* deep band */
  --navy-2:     #122F47;
  --cyan:       #2BB6C0;
  --amber:      #EE9F4D;

  --maxw: 1280px;
  --gut: 40px;

  --r-sm: 10px;
  --r-md: 18px;
  --r-lg: 28px;
  --r-pill: 999px;

  --serif: "Poppins", system-ui, -apple-system, sans-serif;
  --sans: "Poppins", system-ui, -apple-system, sans-serif;
  --mono: "Poppins", system-ui, -apple-system, sans-serif;

  --shadow-sm: 0 2px 8px rgba(14,42,63,.06);
  --shadow-md: 0 18px 50px -24px rgba(14,42,63,.35);
  --shadow-lg: 0 40px 90px -40px rgba(14,42,63,.45);

  --ease: cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--blue);color:#fff}

/* ---- Layout ---- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--gut)}
.section{padding:120px 0}
.section.tight{padding:84px 0}
@media(max-width:760px){
  :root{--gut:22px}
  .section{padding:78px 0}
  body{font-size:16px}
}

/* ---- Typography ---- */
h1,h2,h3,h4{font-family:var(--serif);font-weight:300;margin:0;letter-spacing:-.01em;line-height:1.08;color:var(--ink)}
.display{
  font-size:clamp(2.8rem,6.4vw,5.6rem);
  font-weight:300;
  line-height:1.02;
  letter-spacing:-.022em;
}
.h-sec{font-size:clamp(2.1rem,4vw,3.4rem);font-weight:300;line-height:1.06;letter-spacing:-.018em}
.h-3{font-size:clamp(1.5rem,2.2vw,2rem);font-weight:400}
em,.it{font-style:italic}
.serif{font-family:var(--serif)}
.lede{font-size:clamp(1.1rem,1.5vw,1.35rem);line-height:1.6;color:var(--ink-2);font-weight:400}

.eyebrow{
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  font-weight:500;
  color:var(--blue-deep);
  display:inline-flex;align-items:center;gap:10px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.6}
.eyebrow.center{justify-content:center}
.eyebrow.center::after{content:"";width:26px;height:1px;background:currentColor;opacity:.6}
.eyebrow.plain::before{display:none}

p{margin:0 0 1em}
.muted{color:var(--ink-2)}

/* ---- Buttons ---- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--sans);font-weight:600;font-size:.95rem;
  padding:15px 28px;border-radius:var(--r-pill);
  border:1px solid transparent;cursor:pointer;
  transition:all .35s var(--ease);
  white-space:nowrap;
}
.btn .arr{transition:transform .35s var(--ease)}
.btn:hover .arr{transform:translateX(4px)}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 12px 30px -12px rgba(78,173,226,.7)}
.btn-primary:hover{background:var(--blue-deep);box-shadow:0 16px 38px -12px rgba(44,136,188,.75);transform:translateY(-2px)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000;transform:translateY(-2px)}
.btn-ghost{background:#fff;color:var(--ink);border-color:#BBCDD8}
.btn-ghost:hover{border-color:var(--ink);background:var(--ink);color:#fff}
.btn-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.btn-light:hover{background:#fff;color:var(--navy);border-color:#fff;transform:translateY(-2px)}
.btn-lg{padding:18px 34px;font-size:1rem}

.link-arrow{display:inline-flex;align-items:center;gap:9px;font-weight:600;color:var(--blue-deep);font-size:.96rem}
.link-arrow .arr{transition:transform .35s var(--ease)}
.link-arrow:hover .arr{transform:translateX(5px)}

/* ============================================================
   NAV
   ============================================================ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:background .4s var(--ease),box-shadow .4s var(--ease),padding .4s var(--ease);
  padding:16px 0;
  background:rgba(255,255,255,.92);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-2);
}
.nav.solid{box-shadow:0 8px 30px -22px rgba(14,42,63,.5);border-bottom-color:var(--line);padding:12px 0}
.nav.on-dark{background:transparent;-webkit-backdrop-filter:none;backdrop-filter:none;border-bottom-color:transparent}
.nav.on-dark .brand .logo{filter:brightness(0) invert(1)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:30px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--serif);font-size:1.45rem;font-weight:400;letter-spacing:-.02em}
.brand .logo{height:38px;width:auto;flex:none;display:block}
.footer .brand .logo{height:40px}
.brand b{font-weight:600;font-family:var(--sans);font-size:1.18rem;letter-spacing:-.01em}
.brand .b2{color:var(--blue-deep)}
.nav.on-dark .brand,.nav.on-dark .nav-links a{color:#fff}
.nav.on-dark .brand .b2{color:var(--blue)}

.nav-links{display:flex;align-items:center;gap:34px;list-style:none;margin:0;padding:0}
.nav-links a{font-size:.96rem;font-weight:500;position:relative;padding:4px 0;color:var(--ink-2)}
.nav.on-dark .nav-links a{color:rgba(255,255,255,.82)}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}
.nav.on-dark .nav-links a:hover{color:#fff}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-2px;height:1.5px;width:0;background:var(--blue);transition:width .3s var(--ease)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}

.nav-links .has-dropdown{position:relative}
.nav-links .caret{display:inline-block;width:6px;height:6px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);margin-left:8px;position:relative;top:-2px;transition:transform .25s var(--ease)}
.nav-links .has-dropdown:hover .caret{transform:rotate(-135deg);top:1px}
.nav-links .dropdown{position:absolute;top:100%;left:-14px;transform:translateY(14px);min-width:150px;list-style:none;margin:0;padding:8px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transition:.25s var(--ease);z-index:130}
.nav-links .dropdown::before{content:"";position:absolute;top:-16px;left:0;right:0;height:16px}
.nav-links .has-dropdown:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.nav-links .dropdown li{display:block;margin:0}
.nav-links .dropdown a{display:block;text-align:left;padding:9px 14px;border-radius:10px;font-size:.9rem;font-weight:500;color:var(--ink-2) !important;white-space:nowrap;transition:background .2s,color .2s}
.nav-links .dropdown a::after{display:none !important}
.nav-links .dropdown a:hover{background:var(--mist);color:var(--ink) !important}
.nav-links .dropdown a.ddactive{background:var(--mist);color:var(--blue-deep) !important}

/* services mega — centered under nav, 3 columns */
.nav-links .has-mega{position:static}
.nav-links .mega{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(7px);width:600px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-md);padding:12px;z-index:130;opacity:0;visibility:hidden;transition:.25s var(--ease)}
.nav-links .mega::before{content:"";position:absolute;top:-10px;left:0;right:0;height:10px}
.nav-links .has-mega:hover .mega,.nav-links .mega:hover{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.mega-inner{display:grid;grid-template-columns:repeat(3,1fr);gap:2px}
.nav-links .mega-item{display:flex;gap:11px;align-items:center;padding:9px 12px;border-radius:9px;transition:background .2s,color .2s}
.nav-links .mega-item:hover{background:var(--mist)}
.mega-item .mi-ic{width:20px;height:20px;flex:none;display:grid;place-items:center}
.mega-item .mi-ic svg{width:18px;height:18px;stroke:var(--blue-deep);fill:none;stroke-width:1.7}
.mega-item b{font-size:.86rem;font-weight:500;color:var(--ink-2);line-height:1.25;transition:color .2s}
.nav-links .mega-item:hover b{color:var(--blue-deep)}
.nav-links .mega a::after{display:none !important}
.nav-links .mega a::after{display:none !important}
@media(max-width:940px){.nav-links .mega,.nav-links .dropdown{display:none}}

.nav-cta{display:flex;align-items:center;gap:16px}
.burger{display:none;background:none;border:0;cursor:pointer;flex-direction:column;gap:5px;padding:8px}
.burger span{width:24px;height:2px;background:var(--ink);transition:.3s}
.nav.on-dark .burger span{background:#fff}

@media(max-width:940px){
  .nav-links,.nav-cta .btn{display:none}
  .burger{display:flex}
}

/* mobile menu */
.mobile-menu{
  position:fixed;inset:0;z-index:200;background:var(--navy);
  display:flex;flex-direction:column;gap:2px;padding:84px 26px 36px;
  transform:translateY(-100%);transition:transform .5s var(--ease);overflow-y:auto;
}
.mobile-menu.open{transform:translateY(0)}
.mm-link,.mm-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;
  font-family:var(--serif);font-size:1.6rem;font-weight:300;color:#fff;padding:14px 0;
  border:0;border-bottom:1px solid rgba(255,255,255,.1);background:none;text-align:left;cursor:pointer;font-feature-settings:inherit}
.mm-caret{width:9px;height:9px;flex:none;border-right:2px solid rgba(255,255,255,.55);border-bottom:2px solid rgba(255,255,255,.55);transform:rotate(45deg);transition:transform .3s var(--ease);margin-right:4px}
.mm-group.open .mm-caret{transform:rotate(-135deg)}
.mm-sub{display:grid;grid-template-rows:0fr;transition:grid-template-rows .35s var(--ease)}
.mm-group.open .mm-sub{grid-template-rows:1fr}
.mm-sub-inner{min-height:0;overflow:hidden;display:flex;flex-direction:column}
.mm-sub a{font-family:var(--sans);font-size:1rem;font-weight:400;color:rgba(255,255,255,.72);padding:12px 0 12px 4px;border-bottom:1px solid rgba(255,255,255,.06)}
.mm-sub a:hover{color:#fff}
.mm-sub a.mm-all{color:var(--blue);font-weight:600}
.mobile-menu .btn{margin-top:24px;align-self:flex-start}
.mclose{position:absolute;top:26px;right:24px;background:none;border:0;color:#fff;font-size:2rem;cursor:pointer;line-height:1;z-index:2}

/* ============================================================
   FOOTER
   ============================================================ */
.footer{background:#fff;color:var(--ink-2);padding:84px 0 32px;border-top:1px solid var(--line)}
.footer a{color:var(--ink-2);transition:color .25s}
.footer a:hover{color:var(--blue-deep)}
.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:48px;padding-bottom:48px;border-bottom:1px solid var(--line)}
.footer .brand{color:var(--ink);margin-bottom:18px}
.footer-tag{font-size:.98rem;line-height:1.6;max-width:320px;margin-bottom:24px;color:var(--ink-2)}
.foot-socials{display:flex;gap:12px}
.foot-socials a{width:40px;height:40px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;color:var(--ink-2);transition:.25s}
.foot-socials a svg{width:17px;height:17px;display:block;fill:currentColor}
.foot-socials a:hover{background:var(--blue);border-color:var(--blue);color:#fff}
.foot-col h5{font-family:var(--mono);font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--blue-deep);font-weight:500;margin:0 0 20px}
.foot-col ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}
.foot-col .ct-label{color:var(--ink-3);font-size:.82rem;margin-bottom:2px}
.foot-col .ct-val{color:var(--ink);font-size:1rem;margin-bottom:16px}
.footer-bot{display:flex;justify-content:space-between;align-items:center;padding-top:24px;font-size:.85rem;color:var(--ink-3);gap:20px;flex-wrap:wrap}
@media(max-width:860px){.footer-top{grid-template-columns:1fr 1fr;gap:36px}}
@media(max-width:560px){.footer-top{grid-template-columns:1fr}}

/* ---- reveal on scroll ---- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}}