*{
  margin:0;
  padding:0;
  box-sizing:border-box;
  font-family: 'Poppins', sans-serif;
}

body{
  min-height:100vh;
  display:flex;
  justify-content:center;
  align-items:center;
  background: linear-gradient(135deg,#0f172a,#1e293b,#111827);
  overflow:hidden;
}

.container{
  width:950px;
  height:560px;
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(20px);
  border:1px solid rgba(255,255,255,0.1);
  border-radius:30px;
  display:flex;
  padding:25px;
  gap:25px;
  box-shadow:
  0 20px 40px rgba(0,0,0,0.35);
}

/* KALKULATOR */
.calculator{
  flex:1;
  display:flex;
  flex-direction:column;
  gap:20px;
}

.display{
  height:150px;
  background:#0f172a;
  border-radius:25px;
  padding:25px;
  display:flex;
  flex-direction:column;
  justify-content:end;
  align-items:flex-end;
  overflow:hidden;
  position:relative;
  box-shadow: inset 0 0 20px rgba(255,255,255,0.03);
}

.display::before{
  content:'';
  position:absolute;
  width:180px;
  height:180px;
  background:rgba(59,130,246,0.15);
  border-radius:50%;
  top:-80px;
  right:-50px;
  filter: blur(20px);
}

.history-mini{
  color:#94a3b8;
  font-size:18px;
  margin-bottom:8px;
}

.result{
  color:white;
  font-size:52px;
  font-weight:600;
  max-width:100%;
  overflow-x:auto;
}

.buttons{
  display:grid;
  grid-template-columns: repeat(4,1fr);
  gap:15px;
  flex:1;
}

button{
  border:none;
  border-radius:20px;
  font-size:24px;
  cursor:pointer;
  transition:0.2s;
  font-weight:600;
}

button:hover{
  transform:translateY(-4px);
}

button:active{
  transform:scale(0.95);
}

.number{
  background:#e2e8f0;
  color:#0f172a;
}

.operator{
  background:linear-gradient(135deg,#4f46e5,#3b82f6);
  color:white;
}

.equal{
  background:linear-gradient(135deg,#14b8a6,#06b6d4);
  color:white;
}

.clear{
  background:linear-gradient(135deg,#ef4444,#f97316);
  color:white;
}

.special{
  background:#f59e0b;
  color:white;
}

.zero{
  grid-column: span 2;
}

/* HISTORY */
.history-box{
  width:280px;
  background:rgba(255,255,255,0.05);
  border-radius:25px;
  padding:25px;
  display:flex;
  flex-direction:column;
}

.history-top{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:20px;
}

.history-top h2{
  color:white;
  font-size:24px;
}

.clear-history{
  color:#94a3b8;
  cursor:pointer;
  font-size:14px;
  transition:0.2s;
}

.clear-history:hover{
  color:white;
}

.history-list{
  overflow-y:auto;
  flex:1;
  padding-right:5px;
}

.history-item{
  background:rgba(255,255,255,0.06);
  padding:15px;
  border-radius:18px;
  margin-bottom:12px;
  color:white;
}

.history-item p{
  color:#94a3b8;
  font-size:14px;
}

.history-item h3{
  margin-top:5px;
  font-size:22px;
}

@media(max-width:900px){

  .container{
    width:95%;
    height:auto;
    flex-direction:column;
  }

  .history-box{
    width:100%;
    height:250px;
  }

}