* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', 'Roboto', sans-serif;
  padding: 20px;
  max-width: 800px;
  margin: auto;
  background-color: #f5f7fa;
  color: #333;
}

input,
button,
select,
textarea {
  font-size: 1em;
  padding: 12px;
  margin: 10px 0;
  width: 100%;
  border-radius: 6px;
  border: 1px solid #ccc;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.05);
  background-color: #fff;
}

button {
  cursor: pointer;
  background-color: #007bff;
  color: #fff;
  border: none;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #0056b3;
}

pre {
  background: #fff;
  border: 1px solid #ccc;
  padding: 15px;
  white-space: pre-wrap;
  height: 200px;
  overflow-y: auto;
  border-radius: 6px;
}

textarea {
  height: 200px;
  resize: none;
}

label {
  font-weight: bold;
  display: block;
  margin-top: 20px;
}

/* 小窓を中央に配置するためのラッパー（完全対応版） */
.dropArea-wrapper {
  display: flex;
  justify-content: center;
  width: 100vw;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  margin: 30px 0;
}

/* 小窓（画像表示枠） */
#dropArea.viewport {
  border: 2px dashed #ccc;
  position: relative;
  overflow: hidden;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #fafafa;
  border-radius: 8px;
}

/* ドラッグ対象画像 */
#image {
  position: absolute;
  cursor: grab;
  user-select: none;
}

/* 画像未読み込み時のドラッグ誘導メッセージ */
#dropMessage {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #999;
  font-size: 1.2em;
  text-align: center;
  pointer-events: none;
  user-select: none;
  z-index: 1;
  white-space: nowrap;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 1px 0 10px;
  padding-top: 4px;
}

.checkbox-group input[type="checkbox"] {
  width: auto;
  margin: 0;
  transform: translateY(12px);
}

#copyright {
  display: block;
  margin: 2rem auto 0;
  font-size: 0.8rem;
  text-align: center;
}