:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --card: #f7f7f9;
  --primary: #0078d7;
}
body.dark {
  --bg: #121212;
  --text: #f1f1f1;
  --card: #1e1f24;
  --primary: #3ea6ff;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: system-ui, Arial, sans-serif;
  background: var(--bg); color: var(--text);
}
header, footer {
  background: var(--primary); color: #fff;
  padding: 10px 16px; display: flex; align-items: center; justify-content: space-between;
}
main { padding: 16px; max-width: 1100px; margin: 0 auto; }
h1, h2 { margin: 0.4rem 0; }
#openFile, #viewer, #exportButtons { background: var(--card); border-radius: 12px; padding: 12px; margin-bottom: 12px; }
#dropZone {
  border: 2px dashed #aaa; border-radius: 12px; padding: 20px; text-align: center; margin-top: 10px;
}
#dropZone.hover { border-color: var(--primary); background: rgba(0,0,0,0.03); }
.url-row { display: flex; gap: 8px; margin-top: 8px; }
.url-row input { flex: 1; padding: 8px; border-radius: 8px; border: 1px solid #ccc; }
button {
  border: none; background: var(--primary); color: #fff; padding: 8px 12px;
  border-radius: 10px; cursor: pointer;
}
button:hover { opacity: 0.93; }
#tabs { display: flex; gap: 8px; margin: 10px 0; }
#tabs button { background: #e8eef8; color: #123; }
#tabs button.active { background: var(--primary); color: #fff; }
.tabContent { display: none; }
.tabContent.active { display: block; }
#editorContainer { min-height: 380px; background: #fff; color:#000; }
#preview { background: #fff; color: #000; padding: 12px; border-radius: 8px; }
footer p { margin: 0; }