body{
  margin:0;
  font-family:Arial, sans-serif;
  background:#fff;
  color:#111;
}

.container{
  width:90%;
  max-width:1100px;
  margin:auto;
}

.site-header{
  background:#fff;
  padding:15px 0;
  box-shadow:0 2px 10px #ddd;
}

.header-flex{
  display:flex;
  justify-content:space-between;
  align-items:center;
}

.logo{
  font-size:26px;
  font-weight:700;
  color:#111;
}

.logo img{
  width:45px;
  height:45px;
  vertical-align:middle;
}

.nav-menu a{
  margin-left:20px;
  color:#111;
  font-weight:600;
}

.hero-section{
  background:#57c21c;
  padding:50px 0;
}

.hero-content{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:30px;
}

.hero-left{
  width:55%;
  color:#fff;
}

.hero-left h1{
  font-size:42px;
  margin:0 0 10px;
}

.btn-download{
    background:#fff;
    color:#57c21c;
    padding:22px 50px;
    font-size:24px;
    font-weight:700;
    border-radius:12px;
}

.hero-right{
  width:40%;
  text-align:center;
}

.hero-right img{
  max-width:320px;
  margin:auto;
}

@media(max-width:768px){
  .header-flex,
  .hero-content{
    flex-direction:column;
    text-align:center;
  }

  .hero-left,
  .hero-right{
    width:100%;
  }

  .hero-left h1{
    font-size:30px;
  }
}