.rtb-tabs { font-family: Arial, sans-serif; }

/* Buttons row */
.rtb-tab-buttons {
  display: flex;
  border-bottom: 2px solid #e0e0e0;
  margin-bottom: 10px;
}
.rtb-tab-toggle {
  cursor: pointer;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #555;
  background: #f4f4f4;
  border: 1px solid #ddd;
  border-bottom: none;
  border-top-left-radius: 6px;
  border-top-right-radius: 6px;
  margin-right: 4px;
  transition: all 0.3s ease;
}
.rtb-tab-toggle.active {
  background: #1abc9c;
  color: #fff;
  border-color: #1abc9c;
}

/* Contents */
.rtb-tab-contents { width: 100%; }
.rtb-tab-content {
  display: none;
  width: 100%;
  padding: 20px;
  border: 1px solid #ddd;
  border-top: none;
  background: #fff;
}
.rtb-tab-content.active { display: block; }