body {
  font-family: sans-serif;
  margin: 20px;
  background: #f5f5f5;
}

h1 {
  text-align: center;
  margin-bottom: 30px;
}

/* Blocks (upper and lower) */
.block {
  margin-bottom: 30px;
}
.row {
  display: flex;
  gap: 20px;
  margin-bottom: 10px;
  align-items: flex-start; /* ← これが重要 */
}
.drag-over {
  border: 5px dashed #4a90e2; /* 青い破線の枠を表示 */
  background-color: rgba(74, 144, 226, 0.1);
}
.custom-file-button {
  padding: 5px 15px;
  background-color: #e0e0e0;
  border: 1px solid #ccc;
  cursor: pointer;
  border-radius: 4px;
}
.custom-file-button:hover {
  background-color: #d0d0d0;
}
.col {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* Textareas */
textarea {
  width: 100%;
  height: 260px;
  padding: 10px;
  font-family: monospace;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  background: white;

  box-sizing: border-box; /* ← これが決定打 */
}


/* Right side (buttons and file input) */
.col.right {
  gap: 15px;
}

/* Panels on the right */
.panel {
  background: transparent;
  border: none;
  padding: 0;
}

button {
  width: 100%;
  padding: 10px;
  font-size: 14px;
  cursor: pointer;
}

select {
  padding: 5px;
  margin-right: 10px;
}
.footer {
  margin-top: 40px;
  padding: 10px 0;
  font-size: 12px;
  color: #666;
  text-align: center;
  border-top: 1px solid #ddd;
}