body{
  margin:0;
  font-family:'Noto Sans Bengali','Segoe UI',sans-serif;
  background:linear-gradient(135deg,#eef2ff,#f8fafc);
  color:#1e293b;
  -webkit-font-smoothing:antialiased;
}

/* Header */
header{
  background:linear-gradient(135deg,#4a6cf7,#6a11cb);
  color:white;
  padding:25px 20px;
  border-bottom-left-radius:25px;
  border-bottom-right-radius:25px;
  box-shadow:0 10px 30px rgba(0,0,0,0.12);
}

/* App Header */
.app-header{
  display:flex;
  align-items:center;
  gap:15px;
}

.app-icon{
  width:80px;
  border-radius:20px;
  box-shadow:0 8px 20px rgba(0,0,0,0.25);
}

.app-info h2{
  margin:0;
  font-size:20px;
  font-weight:600;
}

.app-info p{
  margin:3px 0;
  opacity:0.85;
  font-size:14px;
}

/* Meta Info */
.meta{
  display:flex;
  gap:25px;
  margin-top:10px;
}

.meta div{
  text-align:center;
  font-size:14px;
  font-weight:500;
}

.meta span{
  font-size:12px;
  opacity:0.7;
}

/* Install */
.install-box{
  text-align:center;
  margin-top:20px;
}

#installBtn{
  background:#00c853;
  padding:12px 45px;
  border:none;
  border-radius:30px;
  color:white;
  font-size:16px;
  font-weight:600;
  cursor:pointer;
  transition:0.3s;
  box-shadow:0 6px 18px rgba(0,200,83,0.4);
}

#installBtn:hover{
  transform:translateY(-2px) scale(1.05);
  background:#00b248;
}

/* Progress */
.progress-box{
  width:80%;
  height:6px;
  background:rgba(255,255,255,0.3);
  margin:12px auto;
  border-radius:10px;
  overflow:hidden;
}

#progressBar{
  height:100%;
  width:0;
  background:linear-gradient(90deg,#00e676,#00c853);
  transition:width 0.3s;
}

/* Container */
.container{
  max-width:1000px;
  margin:auto;
  padding:20px;
}

/* Card */
.card{
  background:rgba(255,255,255,0.75);
  backdrop-filter:blur(12px);
  padding:22px;
  border-radius:20px;
  margin-bottom:20px;
  box-shadow:0 12px 35px rgba(0,0,0,0.06);
  transition:0.3s;
}

.card:hover{
  transform:translateY(-5px);
  box-shadow:0 18px 40px rgba(0,0,0,0.1);
}

/* Offer Box */
.offer-box{
  background:#f8fafc;
  border-left:5px solid #4a6cf7;
  padding:15px;
  border-radius:12px;
  margin-top:15px;
  line-height:1.7;
  font-size:14px;
}

/* Highlight */
.highlight{
  border:2px solid #4a6cf7;
}

/* Price */
.price{
  font-size:28px;
  font-weight:bold;
  color:#4a6cf7;
}

/* Buttons */
.btn{
  padding:10px 22px;
  border:none;
  border-radius:10px;
  cursor:pointer;
  background:#4a6cf7;
  color:white;
  font-weight:500;
  transition:0.3s;
}

.btn:hover{
  background:#3b55d1;
  transform:translateY(-2px);
}

.btn.primary{
  background:#00c853;
}

.btn.primary:hover{
  background:#00b248;
}

/* Cart */
.cart-item{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:10px;
  padding:10px 0;
  border-bottom:1px solid #eee;
}

/* Footer */
footer{
  text-align:center;
  padding:20px;
  background:#f1f5f9;
  margin-top:20px;
  font-size:14px;
}

/* Responsive */
@media(max-width:600px){

  header{
    padding:20px 15px;
  }

  .app-header{
    flex-direction:column;
    text-align:center;
  }

  .meta{
    justify-content:center;
    gap:15px;
  }

  .container{
    padding:15px;
  }

  .card{
    padding:15px;
  }

  #installBtn{
    width:100%;
  }

  .progress-box{
    width:100%;
  }
}