body{margin:0;font-family:Arial;background:#f4f6f9}
.topbar{
  height:55px;
  background:#0b3d2e;
  color:#fff;
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:0 20px;
}
.layout{display:flex}
.sidebar{
  width:230px;
  background:#ffffff;
  border-right:1px solid #ddd;
  min-height:100vh;
}
.sidebar ul{list-style:none;padding:0}
.sidebar li{
  padding:12px 20px;
  cursor:pointer;
}
.sidebar li:hover{
  background:#e8f5e9;
}
.content{flex:1}
iframe{width:100%;height:100vh;border:none}

/* ===== Sections ===== */
.box{
  background:#fff;
  border:1px solid #4caf50;
  border-radius:6px;
  margin-bottom:18px;
}
.box-header{
  background:#2e7d32;
  color:#fff;
  padding:10px 15px;
  font-weight:bold;
}
.box-body{padding:15px}
button.primary{
  background:#2e7d32;
  color:#fff;
  border:none;
  padding:10px 25px;
}