body {
  font-family: 'Segoe UI', sans-serif;
  background: #f4f7fa;
  color: #333;
  margin: 0;
  padding: 40px 0;
}
.container {
  background: white;
  max-width: 800px;
  margin: auto;
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  text-align: center;
}
.tab-buttons {
  margin: 20px 0;
  display: flex;
  justify-content: center;
  gap: 15px;
}
.tab-btn {
  padding: 12px 20px;
  font-weight: bold;
  background: #ccc;
  color: #c2185b;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}
.tab-btn.active {
  background: #c2185b;
  color: white;
}
.tab-content {
  padding: 20px;
  background: #fafafa;
  border-radius: 10px;
  margin: 10px 0 20px 0;
}
button.primary {
  background: #2980b9;
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 6px;
  margin: 6px;
  font-size: 14px;
  cursor: pointer;
}
button.primary:hover {
  background: #21689e;
}
.logout-link {
  display: inline-block;
  margin-top: 20px;
  color: #2980b9;
  text-decoration: none;
}
.logout-link:hover {
  text-decoration: underline;
}
#dropzone {
  border: 2px dashed #2980b9;
  padding: 20px;
  border-radius: 10px;
  background: #ecf5fb;
  cursor: pointer;
}
#dropzone.dragover {
  background-color: #d6eaf8;
}
#fileList {
  list-style: none;
  padding: 0;
}
#fileList li {
  padding: 6px;
  margin: 4px;
  background: white;
  border-left: 3px solid #2980b9;
}