/* Header bar (title + fit/theme buttons) and the filter row below it,
   including the chip/legend styling shared by the level, relationship,
   and highlight legends. */

header {
  display: flex; align-items: baseline; gap: 12px;
  padding: 14px 18px 10px;
  border-bottom: 1px solid var(--gridline);
  flex-wrap: wrap;
}
header h1 { font-size: 16px; margin: 0; font-weight: 600; }
header p { margin: 0; color: var(--text-secondary); font-size: 12.5px; }
header #lastUpdated { margin: 0; color: var(--muted); font-size: 12.5px; }
header .spacer { flex: 1; }
#themeToggle, #fitBtn {
  border: 1px solid var(--border-strong); background: var(--surface-1); color: var(--text-primary);
  border-radius: 6px; padding: 5px 10px; font-size: 12.5px; cursor: pointer;
}
#themeToggle:hover, #fitBtn:hover { background: var(--gridline); }

.filters {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding: 10px 18px; border-bottom: 1px solid var(--gridline);
  background: var(--surface-1);
}
.filters input[type="text"] {
  background: var(--page-plane); border: 1px solid var(--border-strong); color: var(--text-primary);
  border-radius: 6px; padding: 6px 10px; font-size: 13px; width: 220px;
}
.filters select {
  background: var(--page-plane); border: 1px solid var(--border-strong); color: var(--text-primary);
  border-radius: 6px; padding: 5px 8px; font-size: 12.5px;
}
.filter-group { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.filter-group .label { color: var(--text-secondary); font-size: 12px; }

.chip {
  display: inline-flex; align-items: center; gap: 5px;
  border: 1px solid var(--border-strong); border-radius: 999px;
  padding: 3px 9px 3px 7px; font-size: 12px; cursor: pointer; user-select: none;
  background: var(--page-plane); color: var(--text-secondary);
}
.chip.active { color: var(--text-primary); border-color: currentColor; }
.chip input { display: none; }
.chip.legend-item { cursor: default; }
.chip .swatch { width: 14px; height: 2px; border-radius: 1px; display: inline-block; background: var(--edge-ink); }
.chip .swatch.dashed { background: none; border-top: 2px dashed var(--edge-ink); height: 0; }
.chip .dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; flex: none; }
.legend-shape { width: 9px; height: 9px; display: inline-block; background: var(--muted); flex: none; }
.legend-shape.diamond { border-radius: 2px; transform: rotate(45deg); }