body {
  margin: 0;
  background: #f6f8fb;
  font-family: "Pretendard", sans-serif;
}

.container {
  max-width: 900px;
  margin: 40px auto;
  background: #fff;
  padding: 40px;
  border-radius: 20px;
  box-shadow: 0px 8px 30px rgba(0,0,0,0.08);
}

h1 {
  margin-top: 0;
  margin-bottom: 30px;
}

.input-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 25px;
}

.input-area input {
  padding: 12px;
  font-size: 16px;
  border-radius: 10px;
  border: 1px solid #ddd;
}

.input-area textarea {
  height: 180px;
  padding: 14px;
  font-size: 16px;
  border-radius: 10px;
  border: 1px solid #ddd;
  resize: vertical;
}

#runBtn {
  background: #5c47ff;
  color: #fff;
  padding: 14px;
  border-radius: 10px;
  border: none;
  font-size: 17px;
  cursor: pointer;
}

#runBtn:hover {
  background: #4b3ee0;
}

.toolbar {
  display: flex;
  gap: 10px;
  margin: 10px 0 20px 0;
}

.toolbar.hidden {
  display: none;
}

.viewer {
  white-space: pre-wrap;
  line-height: 1.8;
  font-size: 19px;
}

.wrong {
  color: #e04f5f;
  text-decoration: line-through;
  background: rgba(224,79,95,.1);
  padding: 2px 4px;
  border-radius: 4px;
  cursor: pointer;
}

.correct {
  color: #2db783;
  font-weight: 600;
  background: rgba(45,183,131,.08);
  padding: 2px 4px;
  border-radius: 4px;
  cursor: pointer;
  margin-left: 4px;
}

.popup {
  position: absolute;
  width: 360px;
  padding: 20px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 6px 30px rgba(0,0,0,.18);
  z-index: 1000;
}

.popup.hidden {
  display: none;
}

.popup-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 600;
}

#langToggle {
  margin-left: auto;
  background: #eee;
  border: none;
  padding: 5px 12px;
  border-radius: 8px;
  cursor: pointer;
}

.popup-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 20px;
}

.accept {
  background: #6a4cff;
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  border: none;
}

.ignore {
  background: #ddd;
  padding: 10px 20px;
  border-radius: 10px;
  border: none;
}
.apply {
  background: #2db783;   /* 초록색 */
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  border: none;
}