/* ==========================================================================
   iştebilişim — modern / sade / dinamik
   ========================================================================== */

:root{
  --navy-900:#0d141d;
  --navy-800:#182432;
  --navy-700:#203043;
  --navy-600:#2b3f57;
  --red-700:#96221c;
  --red-600:#bb2b23;
  --red-500:#d6392f;
  --red-100:#fbe6e4;
  --white:#ffffff;
  --gray-50:#f6f7f9;
  --gray-100:#eef0f3;
  --gray-200:#e2e6ec;
  --gray-500:#6b7480;
  --gray-600:#525b68;
  --gray-700:#3a4250;

  --font-heading:'Poppins', 'Inter', sans-serif;
  --font-body:'Inter', sans-serif;

  --radius:14px;
  --shadow-sm:0 2px 10px rgba(13,20,29,.06);
  --shadow-md:0 12px 30px rgba(13,20,29,.10);
  --shadow-red:0 10px 24px rgba(187,43,35,.25);

  --ease:cubic-bezier(.4,0,.2,1);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; scroll-behavior:auto !important;}
}

body{
  margin:0;
  font-family:var(--font-body);
  color:var(--gray-700);
  background:var(--white);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3{
  font-family:var(--font-heading);
  color:var(--navy-800);
  line-height:1.2;
  margin:0 0 .6em;
  font-weight:700;
}

h1{font-size:clamp(2.1rem, 4.4vw, 3.5rem); font-weight:700;}
h2{font-size:clamp(1.6rem, 3vw, 2.35rem);}
h3{font-size:1.15rem; font-weight:600;}

p{margin:0 0 1.1em;}
a{color:inherit; text-decoration:none;}
img{max-width:100%; display:block;}
ul{list-style:none; margin:0; padding:0;}

.container{
  width:100%;
  max-width:1180px;
  margin-inline:auto;
  padding-inline:24px;
}
.container.narrow{max-width:760px;}

.skip-link{
  position:absolute; left:-999px; top:0;
  background:var(--red-600); color:#fff; padding:12px 18px;
  z-index:200; border-radius:0 0 8px 0;
}
.skip-link:focus{left:0;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:8px;
  padding:14px 28px;
  border-radius:999px;
  font-weight:600;
  font-size:.95rem;
  cursor:pointer;
  border:1.5px solid transparent;
  transition:transform .25s var(--ease), box-shadow .25s var(--ease), background-color .25s var(--ease), color .25s var(--ease);
}
.btn:hover{transform:translateY(-2px);}
.btn:focus-visible{outline:2px solid var(--red-500); outline-offset:3px;}

.btn-primary{
  background:var(--red-600); color:#fff;
  box-shadow:var(--shadow-red);
}
.btn-primary:hover{background:var(--red-500); box-shadow:0 14px 28px rgba(187,43,35,.32);}

.btn-outline{
  background:transparent; color:var(--white);
  border-color:rgba(255,255,255,.4);
}
.btn-outline:hover{border-color:#fff; background:rgba(255,255,255,.08);}

.btn-block{width:100%;}

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:100;
  background:rgba(24,36,50,.85);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(255,255,255,.06);
  transition:box-shadow .3s var(--ease);
}
.site-header.scrolled{box-shadow:0 6px 24px rgba(0,0,0,.25);}

.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  padding-block:14px;
}
.brand img{height:46px; width:auto; display:block;}

.main-nav ul{display:flex; gap:30px;}
.main-nav a{
  color:rgba(255,255,255,.82);
  font-size:.94rem; font-weight:500;
  padding:6px 2px;
  position:relative;
}
.main-nav a::after{
  content:'';
  position:absolute; left:0; right:0; bottom:-4px;
  height:2px; background:var(--red-600);
  transform:scaleX(0); transform-origin:left;
  transition:transform .25s var(--ease);
}
.main-nav a:hover::after,
.main-nav a.active::after{transform:scaleX(1);}
.main-nav a:hover{color:#fff;}

.header-actions{display:flex; align-items:center; gap:16px;}

.nav-toggle{
  display:none;
  flex-direction:column; justify-content:center; gap:5px;
  width:38px; height:38px;
  background:transparent; border:none; cursor:pointer;
  padding:0;
}
.nav-toggle span{
  height:2px; width:100%; background:#fff; border-radius:2px;
  transition:transform .3s var(--ease), opacity .3s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  background:linear-gradient(160deg, var(--navy-800), var(--navy-900));
  color:#fff;
  overflow:hidden;
  padding:120px 0 110px;
}
.hero-bg{position:absolute; inset:0; opacity:.55;}
.hero-network{width:100%; height:100%;}
.net-nodes circle{animation:pulse 4s ease-in-out infinite;}
.net-nodes circle:nth-child(2n){animation-delay:.6s;}
.net-nodes circle:nth-child(3n){animation-delay:1.2s;}
@keyframes pulse{
  0%,100%{opacity:.55; r:4;}
  50%{opacity:1;}
}
.net-lines{stroke-dasharray:6 6; animation:dash 20s linear infinite;}
@keyframes dash{to{stroke-dashoffset:-240;}}

.hero-inner{position:relative; z-index:2; max-width:760px;}
.eyebrow{
  text-transform:uppercase; letter-spacing:.14em; font-size:.78rem;
  color:var(--red-500); font-weight:600; margin-bottom:18px;
}
.hero h1{color:#fff; margin-bottom:.5em;}
.text-accent{color:var(--red-500);}
.hero-lead{
  font-size:1.12rem; color:rgba(255,255,255,.78); max-width:600px;
}
.hero-cta{display:flex; gap:16px; flex-wrap:wrap; margin-top:14px;}

/* ---------- Sections ---------- */
.section{padding:100px 0;}
.section-tint{background:var(--gray-50);}
.section-dark{
  background:var(--navy-800); color:rgba(255,255,255,.82);
}
.section-dark h2, .section-dark h3{color:#fff;}
.section-dark p{color:rgba(255,255,255,.72);}

.kicker{
  text-transform:uppercase; letter-spacing:.12em; font-size:.8rem;
  font-weight:700; color:var(--red-600); margin-bottom:14px;
}
.kicker-light{color:var(--red-500);}
.section-lead{font-size:1.05rem; color:var(--gray-600); max-width:640px;}
.section-dark .section-lead{color:rgba(255,255,255,.72);}

.section-grid{
  display:grid; grid-template-columns:1.15fr .85fr; gap:64px; align-items:center;
}
.section-grid-reverse{grid-template-columns:.85fr 1.15fr;}
.section-grid-reverse > *:first-child{order:2;}
.section-grid-reverse > *:last-child{order:1;}

/* ---------- Partner logo wall ---------- */
.partner-grid{
  display:grid; grid-template-columns:repeat(3, 1fr); gap:20px; margin-top:40px;
}
.partner-badge{
  background:#fff;
  border:1px solid var(--gray-200);
  border-radius:var(--radius);
  padding:28px 30px;
  display:flex; align-items:center; justify-content:center;
  min-height:110px;
  transition:transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.partner-badge:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-md);
  border-color:var(--red-100);
}
.partner-badge img{
  max-width:100%;
  max-height:44px;
  width:auto;
  height:auto;
  object-fit:contain;
  filter:grayscale(100%) opacity(.55);
  transition:filter .3s var(--ease);
}
.partner-badge:hover img{filter:grayscale(0%) opacity(1);}

/* ---------- Cards / tech grid ---------- */
.card-grid{
  display:grid; grid-template-columns:repeat(3, 1fr); gap:24px; margin-top:44px;
}
.tech-card{
  background:var(--navy-700);
  border:1px solid rgba(255,255,255,.08);
  border-radius:var(--radius);
  padding:28px 26px;
  transition:transform .3s var(--ease), box-shadow .3s var(--ease), background-color .3s var(--ease);
}
.tech-card:hover{
  transform:translateY(-6px);
  background:var(--navy-600);
  box-shadow:0 16px 34px rgba(0,0,0,.35);
}
.tech-icon{
  width:50px; height:50px; border-radius:12px;
  background:rgba(187,43,35,.15);
  color:var(--red-500);
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px;
}
.tech-icon svg{width:26px; height:26px;}
.tech-card h3{color:#fff; margin-bottom:.4em;}
.tech-card p{color:rgba(255,255,255,.68); margin:0; font-size:.94rem;}

/* ---------- Leadership visual ---------- */
.leadership-visual{display:flex; align-items:center; justify-content:center;}
.leadership-badge{
  width:220px; height:220px; border-radius:50%;
  background:linear-gradient(150deg, var(--navy-800), var(--red-700));
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  color:#fff; box-shadow:var(--shadow-md);
  position:relative;
}
.leadership-badge::before{
  content:'';
  position:absolute; inset:-14px;
  border:1.5px dashed rgba(187,43,35,.4);
  border-radius:50%;
  animation:spin 30s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg);}}
.leadership-badge .counter{
  font-family:var(--font-heading); font-weight:800; font-size:2.6rem; line-height:1;
}
.leadership-badge small{
  margin-top:8px; font-size:.8rem; letter-spacing:.05em; color:rgba(255,255,255,.75);
  text-transform:uppercase;
}

/* ---------- Feature list (Neden biz) ---------- */
.feature-list{
  display:grid; grid-template-columns:1fr 1fr; gap:28px 40px; margin-top:40px;
}
.feature-item{
  display:flex; gap:20px;
  padding:8px 0;
}
.feature-num{
  font-family:var(--font-heading); font-weight:800;
  font-size:1.6rem; color:var(--red-100);
  -webkit-text-stroke:1.5px var(--red-600);
  color:transparent;
  flex-shrink:0;
  line-height:1;
}
.feature-item h3{margin-bottom:.35em;}
.feature-item p{margin:0; color:var(--gray-600); font-size:.95rem;}

/* ---------- Contact ---------- */
.contact-grid{
  display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:start;
}
.contact-info{margin-top:30px; display:flex; flex-direction:column; gap:20px;}
.contact-info li{display:flex; gap:16px; align-items:flex-start;}
.contact-info svg{width:22px; height:22px; color:var(--red-500); flex-shrink:0; margin-top:2px;}
.contact-info a{color:#fff; font-weight:500;}
.contact-info a:hover{color:var(--red-500);}
.contact-info div{color:rgba(255,255,255,.78);}

.location-grid{
  display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-top:34px;
}
.location-card{
  display:flex; gap:14px; align-items:center;
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.1);
  border-radius:12px;
  padding:16px 20px;
  transition:border-color .3s var(--ease), background-color .3s var(--ease);
}
.location-card:hover{border-color:rgba(187,43,35,.5); background:rgba(255,255,255,.08);}
.location-card svg{width:22px; height:22px; color:var(--red-500); flex-shrink:0;}
.location-card strong{display:block; color:#fff; font-family:var(--font-heading); font-size:1rem;}

.contact-form{
  background:#fff; border-radius:var(--radius); padding:32px;
  box-shadow:var(--shadow-md);
}
.form-row{margin-bottom:18px;}
.form-row label{
  display:block; font-size:.85rem; font-weight:600; color:var(--navy-800); margin-bottom:6px;
}
.form-row input, .form-row textarea{
  width:100%; padding:12px 14px; border-radius:9px;
  border:1.5px solid var(--gray-200); font-family:inherit; font-size:.95rem;
  color:var(--gray-700);
  transition:border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.form-row input:focus, .form-row textarea:focus{
  outline:none; border-color:var(--red-500); box-shadow:0 0 0 3px rgba(187,43,35,.12);
}
.form-row textarea{resize:vertical;}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy-900); color:rgba(255,255,255,.6); padding-top:56px;}
.footer-inner{
  display:flex; justify-content:space-between; align-items:flex-start; gap:40px;
  flex-wrap:wrap; padding-bottom:32px; border-bottom:1px solid rgba(255,255,255,.08);
}
.footer-brand img{height:36px; width:auto; display:block; margin-bottom:14px;}
.footer-brand p{font-size:.82rem; max-width:380px; color:rgba(255,255,255,.5); margin:0;}
.footer-nav{display:flex; gap:22px; flex-wrap:wrap;}
.footer-nav a{font-size:.9rem; color:rgba(255,255,255,.65);}
.footer-nav a:hover{color:var(--red-500);}
.footer-bottom{padding:20px 24px; text-align:center; font-size:.8rem;}

/* ---------- Back to top ---------- */
.back-to-top{
  position:fixed; right:24px; bottom:24px; z-index:90;
  width:46px; height:46px; border-radius:50%;
  background:var(--red-600); color:#fff;
  display:flex; align-items:center; justify-content:center;
  box-shadow:var(--shadow-red);
  opacity:0; visibility:hidden; transform:translateY(10px);
  transition:opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
}
.back-to-top svg{width:20px; height:20px;}
.back-to-top.visible{opacity:1; visibility:visible; transform:translateY(0);}
.back-to-top:hover{background:var(--red-500);}

/* ---------- Reveal animation ---------- */
.reveal{
  opacity:0; transform:translateY(24px);
  transition:opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.is-visible{opacity:1; transform:translateY(0);}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .section-grid, .section-grid-reverse, .contact-grid{grid-template-columns:1fr; gap:36px;}
  .section-grid-reverse > *:first-child{order:1;}
  .section-grid-reverse > *:last-child{order:2;}
  .card-grid{grid-template-columns:repeat(2, 1fr);}
  .partner-grid{grid-template-columns:repeat(2, 1fr);}
  .leadership-visual{order:1;}
}

@media (max-width:820px){
  .header-inner{position:relative;}
  .main-nav{
    position:absolute; top:100%; left:0; right:0;
    max-height:80vh;
    overflow-y:auto;
    background:var(--navy-800);
    box-shadow:0 16px 30px rgba(0,0,0,.3);
    border-top:1px solid rgba(255,255,255,.08);
    transform:translateY(-12px);
    opacity:0; visibility:hidden;
    transition:opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
    padding:8px 0;
  }
  .main-nav.open{opacity:1; visibility:visible; transform:translateY(0);}
  .main-nav ul{flex-direction:column; gap:0;}
  .main-nav a{display:block; padding:16px 24px; font-size:1.05rem;}
  .main-nav a::after{display:none;}
  .nav-toggle{display:flex;}
  .feature-list{grid-template-columns:1fr;}
  .card-grid{grid-template-columns:1fr;}
  .hero{padding:100px 0 80px;}
}

@media (max-width:520px){
  .section{padding:70px 0;}
  .partner-grid{grid-template-columns:1fr;}
  .partner-badge{min-height:88px; padding:20px 24px;}
  .location-grid{grid-template-columns:1fr;}
  .hero-cta{flex-direction:column; align-items:stretch;}
  .hero-cta .btn{justify-content:center;}
  .contact-form{padding:22px;}
  .leadership-badge{width:180px; height:180px;}
  .leadership-badge .counter{font-size:2.1rem;}
}