:root {
  color-scheme: light dark;
  --accent: #0a5c9e;
  --danger: #b3261e;
  --border: color-mix(in srgb, CanvasText 18%, Canvas);
  --card: color-mix(in srgb, CanvasText 4%, Canvas);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
header {
  display: flex; align-items: center; gap: 24px;
  padding: 10px 24px; border-bottom: 2px solid var(--accent);
}
header h1 { font-size: 18px; margin: 0; }
header a { color: inherit; text-decoration: none; }
nav { display: flex; align-items: center; gap: 16px; flex: 1; }
nav .spacer { flex: 1; }
nav .user { opacity: 0.75; }
main { max-width: 1100px; margin: 24px auto; padding: 0 24px; }
footer {
  margin: 48px 0 24px; text-align: center;
  font-size: 12px; opacity: 0.6;
}
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 20px; margin-bottom: 24px;
}
.card.narrow { max-width: 480px; margin-inline: auto; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
label { display: block; margin: 12px 0; }
input, select, button {
  font: inherit; padding: 8px 10px;
  border: 1px solid var(--border); border-radius: 6px; background: Canvas; color: CanvasText;
}
button, .button {
  background: var(--accent); color: #fff; border: none; cursor: pointer;
  text-decoration: none; display: inline-block; padding: 8px 14px; border-radius: 6px;
}
button.danger { background: var(--danger); }
button.link { background: none; color: var(--accent); padding: 0; }
button.arrow { background: none; color: CanvasText; border: 1px solid var(--border); padding: 2px 8px; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: nowrap; }
.row.wrap { flex-wrap: wrap; }
form.inline, details.inline { display: inline-block; margin: 0; }
.flash {
  padding: 10px 14px; border-radius: 8px; margin-bottom: 16px;
  background: color-mix(in srgb, var(--accent) 12%, Canvas);
  border: 1px solid var(--accent);
}
.warning { color: var(--danger); }
.muted { opacity: 0.65; font-weight: normal; font-size: 0.9em; }
.badge {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.4px;
  border: 1px solid var(--border); border-radius: 999px; padding: 1px 8px; opacity: 0.8;
}
.tier {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.4px;
  color: var(--accent); font-weight: 600;
}
/* Editor tree */
.checklist { border: 1px solid var(--border); border-radius: 10px; padding: 12px; margin: 16px 0; }
.container {
  border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: 8px; padding: 8px 12px; margin: 10px 0;
}
.node-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.items { list-style: none; padding: 0; margin: 8px 0; }
.item {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 6px 8px; border-bottom: 1px dashed var(--border);
}
.grip { cursor: grab; opacity: 0.5; }
.drop.drag-over { outline: 2px dashed var(--accent); outline-offset: 2px; border-radius: 8px; }
details.add { margin: 6px 0; }
details.add summary, details.inline summary { cursor: pointer; color: var(--accent); }
.preview-container { margin-top: 12px; }
.preview-container ul { list-style: none; padding-left: 8px; }