body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(to bottom right, #e3f2fd, #ffffff);
  margin: 0; padding: 0;
  direction: rtl;
}
header {
  background-color: #0288d1;
  color: white;
  padding: 15px;
  text-align: center;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}
header h1 {
  margin: 0;
  font-size: 2em;
  letter-spacing: 2px;
}
nav {
  margin: 10px;
  text-align: center;
}
nav button {
  margin: 5px;
  padding: 10px 15px;
  background-color: #03a9f4;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s;
  font-size: 1em;
}
nav button:hover {
  background-color: #0277bd;
}
main {
  padding: 20px;
}
.app-section {
  display: none;
  background: #ffffffcc;
  padding: 20px;
  margin-top: 10px;
  border-radius: 15px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.app-section.active {
  display: block;
}
.app-section h2 {
  color: #0288d1;
  margin-bottom: 15px;
}
.app-section input,
.app-section select,
.app-section button {
  margin: 5px 5px 15px 5px;
  padding: 10px;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 1em;
}
.app-section button {
  background-color: #0288d1;
  color: white;
  border: none;
  cursor: pointer;
  transition: background 0.3s;
}
.app-section button:hover {
  background-color: #01579b;
}
.app-section ul {
  list-style: none;
  padding: 0;
}
.app-section li {
  background-color: #f9f9f9;
  margin: 5px 0;
  padding: 10px;
  border-radius: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.app-section li button {
  background-color: red;
  padding: 5px 10px;
  font-size: 0.9em;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
#barcodeResult,
#searchResult,
#salesResult {
  margin-top: 10px;
  font-weight: bold;
  color: #00796b;
}