*{
  box-sizing:border-box;
}

body{
  margin:0;
  background:#0b1120;
  color:#fff;
  font-family:Arial,sans-serif;
}

.login-container{
  display:flex;
  justify-content:center;
  align-items:center;
  height:100vh;
}

.login-card{
  width:400px;
  background:#111827;
  padding:40px;
  border-radius:18px;
  box-shadow:0 0 30px rgba(0,0,0,.5);
}

input,button{
  width:100%;
  padding:14px;
  margin-top:12px;
  border:none;
  border-radius:10px;
}

input{
  background:#1f2937;
  color:#fff;
}

button{
  background:#2563eb;
  color:#fff;
  font-weight:bold;
  cursor:pointer;
}

.sidebar{
  width:260px;
  background:#111827;
  position:fixed;
  top:0;
  left:0;
  height:100vh;
  padding:20px;
}

.sidebar ul{
  list-style:none;
  padding:0;
}

.sidebar li{
  padding:12px 0;
  border-bottom:1px solid #1f2937;
}

.main{
  margin-left:280px;
  padding:25px;
}

.grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
  margin-top:20px;
}

.card,.chart-box,.simple-panel{
  background:#111827;
  padding:20px;
  border-radius:16px;
}

.chart-box{
  margin-top:30px;
}