/* GENEL */
*{margin:0;padding:0;box-sizing:border-box;}
body{font-family:'Roboto',sans-serif; background:#f5f5f5; scroll-behavior:smooth;}
a{text-decoration:none;}

/* HEADER */
header div{display:flex;justify-content:space-between;align-items:center;padding:15px 25px;background:#111;position:sticky;top:0;z-index:1000;}
header img{height:60px;}
nav a{color:white;margin-left:20px;font-weight:bold;transition:.3s;}
nav a:hover{color:#00c3ff;}

/* HERO */
.hero{background:linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('https://images.unsplash.com/photo-1558002038-1055907df827') no-repeat center center;background-size:cover;color:white;padding:120px 20px;text-align:center;}
.hero h1{margin-bottom:15px;font-size:38px;animation:fadeInDown 1s ease;}
.hero p{font-size:18px; animation:fadeInUp 1s ease;}
.btn{background:#25D366;padding:15px 25px;color:white;border-radius:5px;display:inline-block;margin-top:20px;transition:.3s;}
.btn:hover{background:#1ebe57;}

/* SECTIONS */
.section{padding:60px 20px;text-align:center;}
.section h2{margin-bottom:30px;font-size:28px;}
.cards{display:flex;flex-wrap:wrap;justify-content:center;gap:20px;margin-top:30px;}
.card{background:white;padding:25px;width:260px;border-radius:10px;box-shadow:0 0 15px rgba(0,0,0,0.1);transition:.3s;position:relative;overflow:hidden;}
.card:hover{transform:translateY(-5px);box-shadow:0 8px 20px rgba(0,0,0,0.2);}
.card i{font-size:40px;margin-bottom:15px;color:#00c3ff;}

.dark{background:#111;color:white;}

/* İLETİŞİM */
#iletisim{max-width:600px;margin:50px auto;padding:30px;background:#fff;border-radius:10px;box-shadow:0 0 15px rgba(0,0,0,0.1);}
#iletisim input,#iletisim textarea{width:100%;padding:12px;margin:10px 0;border-radius:5px;border:1px solid #ccc;}
#iletisim button{padding:12px 25px;background:#00c3ff;color:#fff;border:none;border-radius:5px;cursor:pointer;transition:.3s;}
#iletisim button:hover{background:#009acc;}

/* FOOTER */
footer{background:#000;color:white;text-align:center;padding:25px;margin-top:30px;}
footer a{color:#00e5ff; transition:.3s;}
footer a:hover{color:#00ffcc; transform:scale(1.05);}

/* Footer İmza */
.footer-sign a{font-weight:bold; transition:.3s;}
.footer-sign a:hover{color:#00ffcc; transform:scale(1.05);}

/* WHATSAPP */
.whatsapp{position:fixed;bottom:20px;right:20px;background:#25D366;color:white;padding:15px 20px;border-radius:50px;font-weight:bold;box-shadow:0 4px 6px rgba(0,0,0,0.3);transition:.3s;z-index:999;}
.whatsapp:hover{background:#1ebe57;}

/* ANİMASYONLAR */
@keyframes fadeInDown{0%{opacity:0;transform:translateY(-30px);}100%{opacity:1;transform:translateY(0);}}
@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px);}100%{opacity:1;transform:translateY(0);}}

/* MOBİL */
@media screen and (max-width:768px){
  header div{flex-direction:column;align-items:flex-start;}
  nav{margin-top:10px;}
  nav a{margin:5px 10px 0 0;}
  .cards{flex-direction:column;align-items:center;}
}
<style>
/* Hizmetler bölümü arka planı */
#hizmetler {
  background-color: #e0f7fa; /* Açık mavi */
  padding: 60px 20px;
  border-radius: 12px;
}

/* Referanslar bölümü arka planı */
#referanslar {
  background-color: #fff3e0; /* Açık turuncu / krem */
  padding: 60px 20px;
  border-radius: 12px;
}

/* Referans kartları */
#referanslar .card {
  background: #ffffff; /* Kartlar beyaz */
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 6px 15px rgba(0,0,0,0.1);
  transition: transform 0.3s;
  text-align: center;
}
</style>