* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: #f5f5f5; color: #333; }
header { background: #fff; border-bottom: 1px solid #e0e0e0; padding: 1rem 2rem; box-shadow: 0 1px 3px rgba(0,0,0,.1); }
header h1 { font-size: 1.5rem; font-weight: 600; }
header nav a { color: #666; text-decoration: none; font-size: .875rem; }
header nav a:hover { color: #333; }
main { padding: 0; }
.container { max-width: 1200px; margin: 0 auto; padding: 1.5rem; }
.upload-zone { border: 2px dashed #ccc; border-radius: 8px; padding: 3rem; text-align: center; cursor: pointer; background: #fff; margin-bottom: 1rem; transition: border-color .2s, background .2s; }
.upload-zone:hover, .upload-zone.dragover { border-color: #0078d4; background: #f0f7ff; }
.upload-zone .icon { font-size: 3rem; margin-bottom: .5rem; }
.upload-zone p { color: #666; margin-bottom: .5rem; }
.upload-zone .hint { font-size: .8rem; color: #999; }
#file-input { display: none; }
.options { display: flex; gap: 1rem; align-items: center; margin-bottom: 1rem; flex-wrap: wrap; }
.options label { display: flex; align-items: center; gap: .4rem; font-size: .9rem; cursor: pointer; }
.options input[type=text] { padding: .3rem .6rem; border: 1px solid #ccc; border-radius: 4px; font-size: .9rem; width: 160px; }
.toolbar { display: flex; gap: .5rem; margin-bottom: 1rem; flex-wrap: wrap; }
button { padding: .5rem 1rem; border: 1px solid #ccc; border-radius: 4px; cursor: pointer; font-size: .875rem; background: #fff; }
button:hover { background: #f0f0f0; }
button.primary { background: #0078d4; color: #fff; border-color: #0078d4; }
button.primary:hover { background: #106ebe; }
button:disabled { opacity: .5; cursor: not-allowed; }
.editor-pane { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.editor-label { font-size: .8rem; color: #666; padding: .3rem .5rem; background: #f0f0f0; border: 1px solid #ccc; border-bottom: none; border-radius: 4px 4px 0 0; }
textarea { flex: 1; width: 100%; min-height: 380px; border: 1px solid #ccc; border-radius: 0 0 4px 4px; padding: .5rem; font-family: 'Fira Code', Consolas, monospace; font-size: .85rem; resize: vertical; }
.status { padding: .5rem; font-size: .875rem; border-radius: 4px; margin-top: .5rem; min-height: 2rem; }
.status.success { background: #dff0d8; color: #3c763d; }
.status.error { background: #f2dede; color: #a94442; }
.status.info { background: #d9edf7; color: #31708f; }
.help { margin-top: 1.5rem; background: #fff; border: 1px solid #e0e0e0; border-radius: 6px; padding: 1rem; }
.help h3 { font-size: 1rem; margin-bottom: .5rem; }
.help ul { padding-left: 1.5rem; font-size: .875rem; color: #555; }
.help li { margin-bottom: .3rem; }
footer { background: #fff; border-top: 1px solid #e0e0e0; padding: 1.5rem 2rem; text-align: center; color: #666; font-size: .875rem; }
footer a { color: #666; }
@media (prefers-color-scheme: dark) {
  body { background: #1a1a1a; color: #e0e0e0; }
  header, footer { background: #2d2d2d; border-color: #404040; }
  header h1 { color: #e0e0e0; }
  header nav a, footer { color: #999; }
  .upload-zone { background: #2d2d2d; border-color: #555; }
  .upload-zone:hover, .upload-zone.dragover { border-color: #4a9eff; background: #1a2d3d; }
  .upload-zone p { color: #aaa; }
  .editor-label { background: #3d3d3d; border-color: #555; color: #aaa; }
  textarea { background: #2d2d2d; border-color: #555; color: #e0e0e0; }
  button { background: #3d3d3d; border-color: #555; color: #e0e0e0; }
  button:hover { background: #4d4d4d; }
  .help { background: #2d2d2d; border-color: #404040; }
  .help ul { color: #aaa; }
  .options input[type=text] { background: #2d2d2d; border-color: #555; color: #e0e0e0; }
}