body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f4f4f4;
  margin: 0;
  padding: 0;
  color: #333;
}

header {
  background-color: #222;
  color: white;
  padding: 1em;
  text-align: center;
}

nav a {
  margin: 0 10px;
  color: #4CAF50;
  text-decoration: none;
  font-weight: bold;
}

main {
  padding: 2em;
  text-align: center;
}

.workspace {
  display: flex;
  justify-content: space-around;
  align-items: flex-start;
  flex-wrap: wrap;
  margin-top: 2em;
}

.pc-case {
  width: 400px;
  height: 500px;
  background-color: #ddd;
  border: 3px dashed #aaa;
  position: relative;
  padding: 1em;
  border-radius: 10px;
}

.dropzone {
  width: 100px;
  height: 100px;
  background-color: #bbb;
  margin: 10px auto;
  line-height: 100px;
  font-weight: bold;
  border-radius: 8px;
  border: 2px dashed #999;
}

.parts {
  display: flex;
  flex-direction: column;
  gap: 15px;
  align-items: center;
}

.draggable {
  width: 120px;
  cursor: grab;
  border: 2px solid transparent;
  border-radius: 8px;
  transition: border 0.3s;
}

.draggable:active {
  cursor: grabbing;
  opacity: 0.6;
}

footer {
  background-color: #222;
  color: white;
  padding: 1em;
  text-align: center;
  margin-top: 2em;
}

#status {
  margin-top: 20px;
  font-size: 1.2em;
  font-weight: bold;
  color: green;
}