*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}

body{
  display:flex;
  min-height:100vh;
  font-family:Segoe UI,sans-serif;
  background:#f4f7fa;
}

.sidebar{
  width:250px;
  background:#111827;
  color:white;
  padding:20px;
}

.sidebar a{
  display:block;
  color:white;
  text-decoration:none;
  padding:12px;
  margin-top:8px;
  border-radius:10px;
}

.sidebar a:hover{
  background:#1e293b;
}

.main{
  flex:1;
  padding:30px;
}

.cards{
  display:grid;
  grid-template-columns:
      repeat(auto-fit,minmax(220px,1fr));
  gap:20px;
}

.card{
  background:white;
  padding:24px;
  border-radius:16px;
  box-shadow:
      0 6px 20px rgba(0,0,0,.08);
}

.card h2{
  color:#64748b;
  font-size:1rem;
}

.card p{
  margin-top:10px;
  font-size:2rem;
  font-weight:bold;
}

@media(max-width:768px){

  body{
    flex-direction:column;
  }

  .sidebar{
    width:100%;
  }

}