diff --git a/lib/l10n/app_localizations.dart b/lib/l10n/app_localizations.dart
index 892d798..4c14c4c 100644
--- a/lib/l10n/app_localizations.dart
+++ b/lib/l10n/app_localizations.dart
@@ -2342,6 +2342,7 @@ const _dutchSourceStringAdditions = {
     'Staaf': 'Bar',
     'Lijn': 'Line',
     'Cirkel': 'Pie',
+    'Spider': 'Spider',
     'CSV importeren': 'Import CSV',
     'Data (CSV: eerste rij = reeksnamen, eerste kolom = labels)':
         'Data (CSV: first row = series names, first column = labels)',
@@ -2364,6 +2365,23 @@ const _dutchSourceStringAdditions = {
     'Toepassen': 'Apply',
     'Bij een cirkel worden maximaal de eerste twee reeksen getoond; de labels vormen de segmenten.':
         'Pie charts show at most the first two series; the labels form the slices.',
+    'Een spider-diagram heeft minstens drie labels (assen) nodig; elke reeks vormt een vlak.':
+        'A spider chart needs at least three labels (axes); each series forms a shape.',
+    'Een spider-diagram heeft minstens drie labels nodig':
+        'A spider chart needs at least three labels',
+    'Minimumlijn (optioneel)': 'Minimum line (optional)',
+    'Maximumlijn (optioneel)': 'Maximum line (optional)',
+    'Schaalminimum (optioneel)': 'Scale minimum (optional)',
+    'Schaalmaximum (optioneel)': 'Scale maximum (optional)',
+    'geen': 'none',
+    'Broncode achtergrond': 'Code background',
+    'Broncode tekst': 'Code text',
+    'Syntaxkleuring': 'Syntax colouring',
+    'Uit = alles in één kleur (bijv. groen op zwart voor een CRT-scherm).':
+        'Off = everything in one colour (e.g. green on black for a CRT screen).',
+    'Eigen kleur (hex)': 'Custom colour (hex)',
+    'Bijvoorbeeld #33FF33 voor een CRT-groen scherm.':
+        'For example #33FF33 for a CRT-green screen.',
     'Platte tekst': 'Plain text',
     'Titel (optioneel)': 'Title (optional)',
     'HTML opent in elke browser zonder internet en rendert codeblokken, wiskunde en mermaid-diagrammen.':
@@ -2382,6 +2400,24 @@ const _dutchSourceStringAdditions = {
   },
   'it': {
     'Annuleren': 'Annulla',
+    'Spider': 'Radar',
+    'Een spider-diagram heeft minstens drie labels (assen) nodig; elke reeks vormt een vlak.':
+        'Un grafico radar richiede almeno tre etichette (assi); ogni serie forma una superficie.',
+    'Een spider-diagram heeft minstens drie labels nodig':
+        'Un grafico radar richiede almeno tre etichette',
+    'Minimumlijn (optioneel)': 'Linea minima (facoltativa)',
+    'Maximumlijn (optioneel)': 'Linea massima (facoltativa)',
+    'Schaalminimum (optioneel)': 'Scala minima (facoltativa)',
+    'Schaalmaximum (optioneel)': 'Scala massima (facoltativa)',
+    'geen': 'nessuno',
+    'Broncode achtergrond': 'Sfondo del codice',
+    'Broncode tekst': 'Testo del codice',
+    'Syntaxkleuring': 'Colorazione della sintassi',
+    'Uit = alles in één kleur (bijv. groen op zwart voor een CRT-scherm).':
+        'Off = tutto in un solo colore (es. verde su nero per uno schermo CRT).',
+    'Eigen kleur (hex)': 'Colore personalizzato (hex)',
+    'Bijvoorbeeld #33FF33 voor een CRT-groen scherm.':
+        'Ad esempio #33FF33 per uno schermo verde CRT.',
     'Kleur van reeks': 'Colore della serie',
     'Kleur van rij': 'Colore della riga',
     'Hexkleur': 'Colore esadecimale',
@@ -2590,6 +2626,24 @@ const _dutchSourceStringAdditions = {
   },
   'de': {
     'Annuleren': 'Abbrechen',
+    'Spider': 'Netz',
+    'Een spider-diagram heeft minstens drie labels (assen) nodig; elke reeks vormt een vlak.':
+        'Ein Netzdiagramm braucht mindestens drei Beschriftungen (Achsen); jede Reihe bildet eine Fläche.',
+    'Een spider-diagram heeft minstens drie labels nodig':
+        'Ein Netzdiagramm braucht mindestens drei Beschriftungen',
+    'Minimumlijn (optioneel)': 'Minimumlinie (optional)',
+    'Maximumlijn (optioneel)': 'Maximumlinie (optional)',
+    'Schaalminimum (optioneel)': 'Skalenminimum (optional)',
+    'Schaalmaximum (optioneel)': 'Skalenmaximum (optional)',
+    'geen': 'keine',
+    'Broncode achtergrond': 'Code-Hintergrund',
+    'Broncode tekst': 'Code-Text',
+    'Syntaxkleuring': 'Syntaxfärbung',
+    'Uit = alles in één kleur (bijv. groen op zwart voor een CRT-scherm).':
+        'Aus = alles in einer Farbe (z. B. Grün auf Schwarz für einen CRT-Bildschirm).',
+    'Eigen kleur (hex)': 'Eigene Farbe (Hex)',
+    'Bijvoorbeeld #33FF33 voor een CRT-groen scherm.':
+        'Zum Beispiel #33FF33 für einen CRT-grünen Bildschirm.',
     'Kleur van reeks': 'Reihenfarbe',
     'Kleur van rij': 'Zeilenfarbe',
     'Hexkleur': 'Hex-Farbe',
@@ -2799,6 +2853,24 @@ const _dutchSourceStringAdditions = {
   },
   'fr': {
     'Annuleren': 'Annuler',
+    'Spider': 'Radar',
+    'Een spider-diagram heeft minstens drie labels (assen) nodig; elke reeks vormt een vlak.':
+        'Un graphique radar nécessite au moins trois étiquettes (axes); chaque série forme une surface.',
+    'Een spider-diagram heeft minstens drie labels nodig':
+        'Un graphique radar nécessite au moins trois étiquettes',
+    'Minimumlijn (optioneel)': 'Ligne minimale (facultatif)',
+    'Maximumlijn (optioneel)': 'Ligne maximale (facultatif)',
+    'Schaalminimum (optioneel)': 'Échelle minimale (facultatif)',
+    'Schaalmaximum (optioneel)': 'Échelle maximale (facultatif)',
+    'geen': 'aucune',
+    'Broncode achtergrond': 'Fond du code',
+    'Broncode tekst': 'Texte du code',
+    'Syntaxkleuring': 'Coloration syntaxique',
+    'Uit = alles in één kleur (bijv. groen op zwart voor een CRT-scherm).':
+        'Désactivé = tout en une seule couleur (p. ex. vert sur noir pour un écran CRT).',
+    'Eigen kleur (hex)': 'Couleur personnalisée (hex)',
+    'Bijvoorbeeld #33FF33 voor een CRT-groen scherm.':
+        'Par exemple #33FF33 pour un écran vert CRT.',
     'Kleur van reeks': 'Couleur de la série',
     'Kleur van rij': 'Couleur de la ligne',
     'Hexkleur': 'Couleur hexadécimale',
@@ -3008,6 +3080,24 @@ const _dutchSourceStringAdditions = {
   },
   'es': {
     'Annuleren': 'Cancelar',
+    'Spider': 'Radar',
+    'Een spider-diagram heeft minstens drie labels (assen) nodig; elke reeks vormt een vlak.':
+        'Un gráfico radar necesita al menos tres etiquetas (ejes); cada serie forma una superficie.',
+    'Een spider-diagram heeft minstens drie labels nodig':
+        'Un gráfico radar necesita al menos tres etiquetas',
+    'Minimumlijn (optioneel)': 'Línea mínima (opcional)',
+    'Maximumlijn (optioneel)': 'Línea máxima (opcional)',
+    'Schaalminimum (optioneel)': 'Escala mínima (opcional)',
+    'Schaalmaximum (optioneel)': 'Escala máxima (opcional)',
+    'geen': 'ninguno',
+    'Broncode achtergrond': 'Fondo del código',
+    'Broncode tekst': 'Texto del código',
+    'Syntaxkleuring': 'Coloreado de sintaxis',
+    'Uit = alles in één kleur (bijv. groen op zwart voor een CRT-scherm).':
+        'Desactivado = todo en un solo color (p. ej. verde sobre negro para una pantalla CRT).',
+    'Eigen kleur (hex)': 'Color personalizado (hex)',
+    'Bijvoorbeeld #33FF33 voor een CRT-groen scherm.':
+        'Por ejemplo #33FF33 para una pantalla verde CRT.',
     'Kleur van reeks': 'Color de la serie',
     'Kleur van rij': 'Color de la fila',
     'Hexkleur': 'Color hexadecimal',
@@ -3217,6 +3307,24 @@ const _dutchSourceStringAdditions = {
   },
   'fy': {
     'Annuleren': 'Annulearje',
+    'Spider': 'Spider',
+    'Een spider-diagram heeft minstens drie labels (assen) nodig; elke reeks vormt een vlak.':
+        'In spiderdiagram hat op syn minst trije labels (assen) nedich; eltse rige foarmet in flak.',
+    'Een spider-diagram heeft minstens drie labels nodig':
+        'In spiderdiagram hat op syn minst trije labels nedich',
+    'Minimumlijn (optioneel)': 'Minimumline (opsjoneel)',
+    'Maximumlijn (optioneel)': 'Maksimumline (opsjoneel)',
+    'Schaalminimum (optioneel)': 'Skaalminimum (opsjoneel)',
+    'Schaalmaximum (optioneel)': 'Skaalmaksimum (opsjoneel)',
+    'geen': 'gjin',
+    'Broncode achtergrond': 'Boarnekoade eftergrûn',
+    'Broncode tekst': 'Boarnekoade tekst',
+    'Syntaxkleuring': 'Syntakskleuring',
+    'Uit = alles in één kleur (bijv. groen op zwart voor een CRT-scherm).':
+        'Ut = alles yn ien kleur (bgl. grien op swart foar in CRT-skerm).',
+    'Eigen kleur (hex)': 'Eigen kleur (hex)',
+    'Bijvoorbeeld #33FF33 voor een CRT-groen scherm.':
+        'Bygelyks #33FF33 foar in CRT-grien skerm.',
     'Kleur van reeks': 'Rigekleur',
     'Kleur van rij': 'Rijekleur',
     'Hexkleur': 'Hekskleur',
@@ -3423,6 +3531,24 @@ const _dutchSourceStringAdditions = {
   },
   'pap': {
     'Annuleren': 'Kanselá',
+    'Spider': 'Radar',
+    'Een spider-diagram heeft minstens drie labels (assen) nodig; elke reeks vormt een vlak.':
+        'Un grafiko radar mester di por lo ménos tres etiketa (ehe); kada serie ta forma un superfisie.',
+    'Een spider-diagram heeft minstens drie labels nodig':
+        'Un grafiko radar mester di por lo ménos tres etiketa',
+    'Minimumlijn (optioneel)': 'Liña mínimo (opshonal)',
+    'Maximumlijn (optioneel)': 'Liña máksimo (opshonal)',
+    'Schaalminimum (optioneel)': 'Eskala mínimo (opshonal)',
+    'Schaalmaximum (optioneel)': 'Eskala máksimo (opshonal)',
+    'geen': 'niun',
+    'Broncode achtergrond': 'Fondo di kódigo',
+    'Broncode tekst': 'Teksto di kódigo',
+    'Syntaxkleuring': 'Koloreashon di sintaksis',
+    'Uit = alles in één kleur (bijv. groen op zwart voor een CRT-scherm).':
+        'Apagá = tur kos den un solo koló (p.e. berde riba pretu pa un pantaya CRT).',
+    'Eigen kleur (hex)': 'Koló propio (hex)',
+    'Bijvoorbeeld #33FF33 voor een CRT-groen scherm.':
+        'Por ehèmpel #33FF33 pa un pantaya berde CRT.',
     'Kleur van reeks': 'Koló di serie',
     'Kleur van rij': 'Koló di liña',
     'Hexkleur': 'Koló hexadecimal',
diff --git a/lib/models/chart.dart b/lib/models/chart.dart
index efb801f..f07bcd2 100644
--- a/lib/models/chart.dart
+++ b/lib/models/chart.dart
@@ -18,7 +18,7 @@ const List<String> chartColorPalette = [
 ];
 
 /// Supported chart kinds for a chart slide.
-enum ChartType { bar, line, pie }
+enum ChartType { bar, line, pie, radar }
 
 ChartType _chartTypeFromName(String? name) => ChartType.values.firstWhere(
   (t) => t.name == name,
@@ -100,9 +100,15 @@ class ChartSpec {
 
   bool get hasInlineData => x.isNotEmpty && series.isNotEmpty;
 
-  /// Bounds only apply to bar/line charts; a pie spec never shows them.
+  /// Whether the optional [minBound]/[maxBound] apply. On bar/line they are
+  /// horizontal threshold lines; on radar they fix the scale (centre/outer
+  /// ring). Pie charts have no axis, so they never use bounds.
   bool get supportsBounds => type != ChartType.pie;
 
+  /// True only where bounds render as horizontal threshold *lines*.
+  bool get supportsBoundLines =>
+      type == ChartType.bar || type == ChartType.line;
+
   ChartSpec copyWith({
     ChartType? type,
     String? title,
diff --git a/lib/models/settings.dart b/lib/models/settings.dart
index 5257d79..96afb90 100644
--- a/lib/models/settings.dart
+++ b/lib/models/settings.dart
@@ -8,6 +8,17 @@ class ThemeProfile {
   final String titleBackgroundColor;
   final String titleTextColor;
   final String sectionBackgroundColor;
+
+  /// Colours for code (broncode) slides. Defaults mirror the atom-one-dark
+  /// editor look. Set e.g. black background + bright green text with
+  /// [codeHighlightSyntax] off for a classic CRT terminal feel.
+  final String codeBackgroundColor;
+  final String codeTextColor;
+
+  /// When false, code is shown monochrome in [codeTextColor] (no per-token
+  /// syntax colours) — required for a believable single-colour CRT screen.
+  final bool codeHighlightSyntax;
+
   final String? logoPath;
   final String logoPosition;
   final int logoSize;
@@ -40,6 +51,9 @@ class ThemeProfile {
     this.titleBackgroundColor = '#1C2B47',
     this.titleTextColor = '#FFFFFF',
     this.sectionBackgroundColor = '#2E7D64',
+    this.codeBackgroundColor = '#282C34',
+    this.codeTextColor = '#ABB2BF',
+    this.codeHighlightSyntax = true,
     this.logoPath,
     this.logoPosition = 'bottom-right',
     this.logoSize = 96,
@@ -70,6 +84,9 @@ class ThemeProfile {
     String? titleBackgroundColor,
     String? titleTextColor,
     String? sectionBackgroundColor,
+    String? codeBackgroundColor,
+    String? codeTextColor,
+    bool? codeHighlightSyntax,
     String? logoPath,
     String? logoPosition,
     int? logoSize,
@@ -92,6 +109,9 @@ class ThemeProfile {
       titleTextColor: titleTextColor ?? this.titleTextColor,
       sectionBackgroundColor:
           sectionBackgroundColor ?? this.sectionBackgroundColor,
+      codeBackgroundColor: codeBackgroundColor ?? this.codeBackgroundColor,
+      codeTextColor: codeTextColor ?? this.codeTextColor,
+      codeHighlightSyntax: codeHighlightSyntax ?? this.codeHighlightSyntax,
       logoPath: clearLogo ? null : (logoPath ?? this.logoPath),
       logoPosition: logoPosition ?? this.logoPosition,
       logoSize: logoSize ?? this.logoSize,
@@ -116,6 +136,9 @@ class ThemeProfile {
       'titleBackgroundColor': titleBackgroundColor,
       'titleTextColor': titleTextColor,
       'sectionBackgroundColor': sectionBackgroundColor,
+      'codeBackgroundColor': codeBackgroundColor,
+      'codeTextColor': codeTextColor,
+      'codeHighlightSyntax': codeHighlightSyntax,
       'logoPath': logoPath,
       'logoPosition': logoPosition,
       'logoSize': logoSize,
@@ -146,6 +169,10 @@ class ThemeProfile {
       titleTextColor: json['titleTextColor'] as String? ?? '#FFFFFF',
       sectionBackgroundColor:
           json['sectionBackgroundColor'] as String? ?? '#2E7D64',
+      codeBackgroundColor:
+          json['codeBackgroundColor'] as String? ?? '#282C34',
+      codeTextColor: json['codeTextColor'] as String? ?? '#ABB2BF',
+      codeHighlightSyntax: json['codeHighlightSyntax'] as bool? ?? true,
       logoPath: json['logoPath'] as String?,
       logoPosition: json['logoPosition'] as String? ?? 'bottom-right',
       logoSize: (json['logoSize'] as num?)?.round() ?? 96,
diff --git a/lib/services/marp_html_service.dart b/lib/services/marp_html_service.dart
index d137768..25508c8 100644
--- a/lib/services/marp_html_service.dart
+++ b/lib/services/marp_html_service.dart
@@ -171,6 +171,8 @@ class MarpHtmlService {
       case ChartType.pie:
         final legendRows = (spec.x.length / 6).ceil().clamp(1, 3);
         _pieSvg(b, spec, plotTop, theme, bottom: 398 - (legendRows - 1) * 28);
+      case ChartType.radar:
+        _radarSvg(b, spec, plotTop, theme, textColor);
     }
     if (spec.type == ChartType.pie) {
       _pieLegendSvg(b, spec, textColor);
@@ -269,7 +271,7 @@ class MarpHtmlService {
     double bottom,
     double maxY,
   ) {
-    if (!spec.supportsBounds) return;
+    if (!spec.supportsBoundLines) return;
     void draw(double? value, String color, String prefix) {
       if (value == null || value < 0 || value > maxY) return;
       final y = bottom - (bottom - top) * (value / maxY);
@@ -448,6 +450,129 @@ class MarpHtmlService {
     }
   }
 
+  static void _radarSvg(
+    StringBuffer b,
+    ChartSpec spec,
+    double top,
+    ThemeProfile? theme,
+    String textColor,
+  ) {
+    final n = spec.x.length;
+    if (n < 3 || spec.series.isEmpty) return;
+    const bottom = 382.0;
+    const cx = 400.0;
+    final cy = (top + bottom) / 2;
+    final radius = math.min(170.0, (bottom - top) / 2 - 34);
+    final (lo, hi, ticks) = _radarScale(spec);
+    final span = (hi - lo) == 0 ? 1.0 : (hi - lo);
+    double angle(int i) => -math.pi / 2 + 2 * math.pi * i / n;
+
+    // Concentric grid rings, evenly spaced across the [lo, hi] scale.
+    for (var ring = 1; ring <= ticks; ring++) {
+      final rr = radius * ring / ticks;
+      final pts = [
+        for (var i = 0; i < n; i++)
+          '${cx + rr * math.cos(angle(i))},${cy + rr * math.sin(angle(i))}',
+      ].join(' ');
+      b.write(
+        '<polygon points="$pts" fill="none" stroke="#e2e8f0" '
+        'stroke-width="1"/>',
+      );
+    }
+
+    // Scale labels up the top spoke: lo at the centre, hi at the outer ring.
+    for (var k = 0; k <= ticks; k++) {
+      final value = lo + span * k / ticks;
+      final y = cy - radius * k / ticks;
+      b.write(
+        '<text x="${cx + 6}" y="${y - 2}" font-size="11" '
+        'fill="#94a3b8">${_num(value)}</text>',
+      );
+    }
+
+    // Spokes and axis labels.
+    for (var i = 0; i < n; i++) {
+      final c = math.cos(angle(i));
+      final s = math.sin(angle(i));
+      b.write(
+        '<line x1="$cx" y1="$cy" x2="${cx + radius * c}" '
+        'y2="${cy + radius * s}" stroke="#e2e8f0" stroke-width="1"/>',
+      );
+      final anchor = c > 0.3 ? 'start' : (c < -0.3 ? 'end' : 'middle');
+      final label = spec.x[i].length > 12
+          ? '${spec.x[i].substring(0, 11)}…'
+          : spec.x[i];
+      b.write(
+        '<text x="${cx + (radius + 18) * c}" y="${cy + (radius + 18) * s + 4}" '
+        'text-anchor="$anchor" font-size="13" fill="$textColor">'
+        '${_esc(label)}</text>',
+      );
+    }
+
+    // One filled polygon per series.
+    for (var si = 0; si < spec.series.length; si++) {
+      final data = spec.series[si].data;
+      final pts = [
+        for (var i = 0; i < n; i++)
+          () {
+            final v = i < data.length ? data[i] : 0.0;
+            final rr = radius * ((v - lo) / span).clamp(0.0, 1.0);
+            return '${cx + rr * math.cos(angle(i))},'
+                '${cy + rr * math.sin(angle(i))}';
+          }(),
+      ].join(' ');
+      final color = _color(spec, si, theme);
+      b.write(
+        '<polygon points="$pts" fill="$color" fill-opacity="0.16" '
+        'stroke="$color" stroke-width="3" stroke-linejoin="round"/>',
+      );
+    }
+  }
+
+  /// Radar scale shared with the live preview: honour optional min/max bounds,
+  /// otherwise round the data range to a tidy scale with an even tick count.
+  static (double, double, int) _radarScale(ChartSpec spec) {
+    var dataMin = 0.0;
+    var dataMax = 0.0;
+    var seen = false;
+    for (final s in spec.series) {
+      for (final v in s.data) {
+        if (!seen) {
+          dataMin = v;
+          dataMax = v;
+          seen = true;
+        } else {
+          if (v < dataMin) dataMin = v;
+          if (v > dataMax) dataMax = v;
+        }
+      }
+    }
+    if (!seen) {
+      dataMin = 0;
+      dataMax = 1;
+    }
+    final rawLo = spec.minBound ?? (dataMin < 0 ? dataMin : 0);
+    final rawHi = spec.maxBound ?? dataMax;
+    final range = (rawHi - rawLo).abs();
+    final r = range <= 0 ? 1.0 : range;
+    final rawStep = r / 4;
+    final mag = math.pow(10, (math.log(rawStep) / math.ln10).floor()).toDouble();
+    final norm = rawStep / mag;
+    final niceNorm = norm < 1.5
+        ? 1.0
+        : norm < 3
+        ? 2.0
+        : norm < 7
+        ? 5.0
+        : 10.0;
+    final step = niceNorm * mag;
+    final lo = spec.minBound ?? (rawLo / step).floorToDouble() * step;
+    var hi = spec.maxBound ?? (rawHi / step).ceilToDouble() * step;
+    if (hi <= lo) hi = lo + step;
+    final ticks = math.max(2, ((hi - lo) / step).round());
+    return (lo, hi, ticks);
+  }
+
   static String _shortChartLabel(String value) =>
       value.length > 13 ? '${value.substring(0, 12)}…' : value;
 
@@ -469,8 +594,10 @@ class MarpHtmlService {
         '.slide h2{font-size:34px;margin:.15em 0;color:${t.accentColor}}'
         '.slide a{color:${t.accentColor}}'
         '.slide p,.slide li{font-size:24px;line-height:1.45}'
-        '.slide pre{background:#f6f8fa;border:1px solid #e1e4e8;border-radius:6px;'
+        '.slide pre{background:${t.codeBackgroundColor};color:${t.codeTextColor};'
+        'border:1px solid ${t.codeTextColor}38;border-radius:6px;'
         'padding:16px;overflow:auto;font-size:18px}'
+        '.slide pre code{color:${t.codeTextColor};background:transparent}'
         '.slide code{font-family:SFMono-Regular,Consolas,"Liberation Mono",monospace}'
         '.slide pre.mermaid{background:transparent;border:0;text-align:center}'
         '.slide img{max-width:100%}'
diff --git a/lib/widgets/dialogs/settings_dialog.dart b/lib/widgets/dialogs/settings_dialog.dart
index 1a99fff..fb7f4a2 100644
--- a/lib/widgets/dialogs/settings_dialog.dart
+++ b/lib/widgets/dialogs/settings_dialog.dart
@@ -939,6 +939,41 @@ class _SettingsDialogState extends ConsumerState<SettingsDialog> {
           (v) =>
               _themeProfile = _themeProfile.copyWith(sectionBackgroundColor: v),
         ),
+        const SizedBox(height: 24),
+        _sectionTitle(l10n.d('Broncode')),
+        _colorSetting(
+          l10n.d('Broncode achtergrond'),
+          _themeProfile.codeBackgroundColor,
+          (v) =>
+              _themeProfile = _themeProfile.copyWith(codeBackgroundColor: v),
+        ),
+        const SizedBox(height: 12),
+        _colorSetting(
+          l10n.d('Broncode tekst'),
+          _themeProfile.codeTextColor,
+          (v) => _themeProfile = _themeProfile.copyWith(codeTextColor: v),
+        ),
+        const SizedBox(height: 6),
+        SwitchListTile(
+          value: _themeProfile.codeHighlightSyntax,
+          onChanged: (v) => setState(() {
+            _themeProfile = _themeProfile.copyWith(codeHighlightSyntax: v);
+            _profileTouched = true;
+          }),
+          title: Text(
+            l10n.d('Syntaxkleuring'),
+            style: const TextStyle(fontSize: 13),
+          ),
+          subtitle: Text(
+            l10n.d(
+              'Uit = alles in één kleur (bijv. groen op zwart voor een CRT-scherm).',
+            ),
+            style: const TextStyle(fontSize: 11, color: Color(0xFF94A3B8)),
+          ),
+          controlAffinity: ListTileControlAffinity.leading,
+          contentPadding: EdgeInsets.zero,
+          dense: true,
+        ),
         const SizedBox(height: 18),
         _stylePreview(),
       ],
@@ -1149,18 +1184,143 @@ class _SettingsDialogState extends ConsumerState<SettingsDialog> {
             for (final color in _colorPresets)
               _colorSwatch(
                 color,
-                selected: value == color,
+                selected: value.toUpperCase() == color,
                 onTap: () => setState(() {
                   onChanged(color);
                   _profileTouched = true;
                 }),
               ),
+            // Show the current value as a selected swatch when it isn't one of
+            // the presets (e.g. a hand-entered CRT green).
+            if (!_colorPresets.contains(value.toUpperCase()))
+              _colorSwatch(
+                value,
+                selected: true,
+                onTap: () => _editCustomColor(value, onChanged),
+              ),
+            _customColorButton(value, onChanged),
           ],
         ),
       ],
     );
   }
 
+  Widget _customColorButton(String value, ValueChanged<String> onChanged) {
+    return Tooltip(
+      message: context.l10n.d('Eigen kleur (hex)'),
+      child: InkWell(
+        onTap: () => _editCustomColor(value, onChanged),
+        borderRadius: BorderRadius.circular(8),
+        child: Container(
+          width: 34,
+          height: 34,
+          decoration: BoxDecoration(
+            borderRadius: BorderRadius.circular(8),
+            border: Border.all(color: const Color(0xFFCBD5E1)),
+          ),
+          child: const Icon(
+            Icons.tune,
+            size: 18,
+            color: Color(0xFF64748B),
+          ),
+        ),
+      ),
+    );
+  }
+
+  Future<void> _editCustomColor(
+    String initial,
+    ValueChanged<String> onChanged,
+  ) async {
+    final picked = await _pickHexColor(initial);
+    if (picked == null || !mounted) return;
+    setState(() {
+      onChanged(picked);
+      _profileTouched = true;
+    });
+  }
+
+  Future<String?> _pickHexColor(String initial) {
+    final controller = TextEditingController(text: initial);
+    String? normalize(String raw) {
+      final up = raw.trim().toUpperCase();
+      final hex = up.startsWith('#') ? up : '#$up';
+      return RegExp(r'^#[0-9A-F]{6}$').hasMatch(hex) ? hex : null;
+    }
+
+    final l10n = context.l10n;
+    return showDialog<String>(
+      context: context,
+      builder: (context) => StatefulBuilder(
+        builder: (context, setDialogState) {
+          final normalized = normalize(controller.text);
+          return AlertDialog(
+            title: Text(l10n.d('Eigen kleur (hex)')),
+            content: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                Row(
+                  children: [
+                    Container(
+                      width: 40,
+                      height: 40,
+                      decoration: BoxDecoration(
+                        color: _parseColor(normalized ?? '#FFFFFF'),
+                        borderRadius: BorderRadius.circular(8),
+                        border: Border.all(color: const Color(0xFFCBD5E1)),
+                      ),
+                    ),
+                    const SizedBox(width: 12),
+                    Expanded(
+                      child: TextField(
+                        controller: controller,
+                        autofocus: true,
+                        decoration: InputDecoration(
+                          labelText: l10n.d('Hexkleur'),
+                          hintText: '#33FF33',
+                          isDense: true,
+                          border: const OutlineInputBorder(),
+                        ),
+                        inputFormatters: [
+                          FilteringTextInputFormatter.allow(
+                            RegExp(r'[#0-9a-fA-F]'),
+                          ),
+                          LengthLimitingTextInputFormatter(7),
+                        ],
+                        onChanged: (_) => setDialogState(() {}),
+                        onSubmitted: (_) {
+                          final ok = normalize(controller.text);
+                          if (ok != null) Navigator.pop(context, ok);
+                        },
+                      ),
+                    ),
+                  ],
+                ),
+                const SizedBox(height: 8),
+                Text(
+                  l10n.d('Bijvoorbeeld #33FF33 voor een CRT-groen scherm.'),
+                  style: const TextStyle(fontSize: 11, color: Color(0xFF94A3B8)),
+                ),
+              ],
+            ),
+            actions: [
+              TextButton(
+                onPressed: () => Navigator.pop(context),
+                child: Text(l10n.d('Annuleren')),
+              ),
+              FilledButton(
+                onPressed: normalized == null
+                    ? null
+                    : () => Navigator.pop(context, normalized),
+                child: Text(l10n.d('Toepassen')),
+              ),
+            ],
+          );
+        },
+      ),
+    ).whenComplete(controller.dispose);
+  }
+
   Widget _colorSwatch(
     String color, {
     required bool selected,
diff --git a/lib/widgets/editors/chart_editor.dart b/lib/widgets/editors/chart_editor.dart
index 5798837..5905208 100644
--- a/lib/widgets/editors/chart_editor.dart
+++ b/lib/widgets/editors/chart_editor.dart
@@ -65,6 +65,8 @@ class _ChartEditorState extends State<ChartEditor> {
     _loadFromSpec(spec);
   }
 
+  bool get _supportsBounds => _type != ChartType.pie;
+
   static String _fmtBound(double? v) => v == null ? '' : _fmt(v);
 
   static double? _parseBound(String raw) {
@@ -133,8 +135,8 @@ class _ChartEditorState extends State<ChartEditor> {
       x: List<String>.from(_xLabels),
       rowColors: List<String?>.from(_rowColors),
       series: series,
-      minBound: _type == ChartType.pie ? null : _parseBound(_minBound.text),
-      maxBound: _type == ChartType.pie ? null : _parseBound(_maxBound.text),
+      minBound: _supportsBounds ? _parseBound(_minBound.text) : null,
+      maxBound: _supportsBounds ? _parseBound(_maxBound.text) : null,
     );
     widget.onUpdate(widget.slide.copyWith(customMarkdown: spec.toBlock()));
   }
@@ -467,6 +469,10 @@ class _ChartEditorState extends State<ChartEditor> {
                     value: ChartType.pie,
                     child: Text(l10n.d('Cirkel')),
                   ),
+                  DropdownMenuItem(
+                    value: ChartType.radar,
+                    child: Text(l10n.d('Spider')),
+                  ),
                 ],
                 onChanged: (v) {
                   if (v == null) return;
@@ -492,7 +498,17 @@ class _ChartEditorState extends State<ChartEditor> {
                 style: const TextStyle(fontSize: 11, color: Color(0xFF64748B)),
               ),
             ),
-          if (_type != ChartType.pie)
+          if (_type == ChartType.radar)
+            Padding(
+              padding: const EdgeInsets.only(top: 8),
+              child: Text(
+                l10n.d(
+                  'Een spider-diagram heeft minstens drie labels (assen) nodig; elke reeks vormt een vlak.',
+                ),
+                style: const TextStyle(fontSize: 11, color: Color(0xFF64748B)),
+              ),
+            ),
+          if (_supportsBounds)
             Padding(
               padding: const EdgeInsets.only(top: 12),
               child: Row(
@@ -502,7 +518,9 @@ class _ChartEditorState extends State<ChartEditor> {
                     child: _boundField(
                       key: const ValueKey('chart-min-bound'),
                       controller: _minBound,
-                      label: l10n.d('Minimumlijn (optioneel)'),
+                      label: _type == ChartType.radar
+                          ? l10n.d('Schaalminimum (optioneel)')
+                          : l10n.d('Minimumlijn (optioneel)'),
                     ),
                   ),
                   const SizedBox(width: 12),
@@ -510,7 +528,9 @@ class _ChartEditorState extends State<ChartEditor> {
                     child: _boundField(
                       key: const ValueKey('chart-max-bound'),
                       controller: _maxBound,
-                      label: l10n.d('Maximumlijn (optioneel)'),
+                      label: _type == ChartType.radar
+                          ? l10n.d('Schaalmaximum (optioneel)')
+                          : l10n.d('Maximumlijn (optioneel)'),
                     ),
                   ),
                 ],
diff --git a/lib/widgets/slides/slide_preview.dart b/lib/widgets/slides/slide_preview.dart
index c5d4b5c..3810af3 100644
--- a/lib/widgets/slides/slide_preview.dart
+++ b/lib/widgets/slides/slide_preview.dart
@@ -2095,21 +2095,33 @@ class _CodePreview extends StatelessWidget {
     final lang = slide.codeLanguage.trim();
     final known = lang.isNotEmpty && allLanguages.containsKey(lang);
 
+    final codeBg = _hexColor(profile.codeBackgroundColor);
+    final codeFg = _hexColor(profile.codeTextColor);
+
     final mono = TextStyle(
       fontFamily: 'monospace',
       fontFamilyFallback: const ['Menlo', 'Consolas', 'Courier New'],
       fontSize: w * 0.024,
       height: 1.4,
-      color: const Color(0xFFABB2BF), // atom-one-dark voorgrond
+      color: codeFg,
     );
 
-    // HighlightView gooit een fout bij een onbekende taal; daarom vallen we
-    // dan terug op platte (maar wel monospace) tekst.
-    final Widget codeContent = known
+    // HighlightView throws on an unknown language, so fall back to plain (but
+    // monospace) text. When syntax highlighting is off we always render plain
+    // text so the whole block is one colour — needed for a CRT-green screen.
+    final Widget codeContent = (known && profile.codeHighlightSyntax)
         ? HighlightView(
             code,
             language: lang,
-            theme: atomOneDarkTheme,
+            // Keep atom-one-dark's per-token colours but drop its own
+            // background so our themed [codeBg] shows through unchanged.
+            theme: {
+              ...atomOneDarkTheme,
+              'root': (atomOneDarkTheme['root'] ?? const TextStyle()).copyWith(
+                backgroundColor: codeBg,
+                color: codeFg,
+              ),
+            },
             padding: EdgeInsets.zero,
             textStyle: mono,
           )
@@ -2127,9 +2139,9 @@ class _CodePreview extends StatelessWidget {
         child: Container(
           width: double.infinity,
           decoration: BoxDecoration(
-            color: const Color(0xFF282C34), // atom-one-dark achtergrond
+            color: codeBg,
             borderRadius: BorderRadius.circular(w * 0.012),
-            border: Border.all(color: const Color(0xFF3A3F4B)),
+            border: Border.all(color: codeFg.withValues(alpha: 0.22)),
           ),
           padding: EdgeInsets.all(w * 0.03),
           child: Column(
@@ -2144,7 +2156,7 @@ class _CodePreview extends StatelessWidget {
                     TextStyle(
                       fontSize: w * 0.03,
                       fontWeight: FontWeight.bold,
-                      color: const Color(0xFFE5E7EB),
+                      color: codeFg,
                     ),
                   ),
                   linkColor: _hexColor(profile.accentColor),
@@ -2475,6 +2487,8 @@ class _ChartPreviewState extends State<_ChartPreview> {
         return _lineChart(spec, textColor);
       case ChartType.pie:
         return _pieChart(spec, textColor);
+      case ChartType.radar:
+        return _radarChart(spec, textColor);
     }
   }
 
@@ -2511,7 +2525,7 @@ class _ChartPreviewState extends State<_ChartPreview> {
 
   /// Optional min/max threshold lines drawn across the plot (bar/line only).
   ExtraLinesData _boundLines(ChartSpec spec) {
-    if (!spec.supportsBounds) return const ExtraLinesData();
+    if (!spec.supportsBoundLines) return const ExtraLinesData();
     final dash = [
       (w * 0.018).round().clamp(4, 14),
       (w * 0.01).round().clamp(3, 9),
@@ -2729,6 +2743,10 @@ class _ChartPreviewState extends State<_ChartPreview> {
         extraLinesData: _boundLines(spec),
         lineTouchData: LineTouchData(
           enabled: true,
+          // Measure proximity to the actual dot (x *and* y), not just the
+          // column, so the tooltip belongs to the point under the cursor.
+          distanceCalculator: (touch, spot) => (touch - spot).distance,
+          touchSpotThreshold: (w * 0.02).clamp(8.0, 24.0).toDouble(),
           mouseCursorResolver: (event, response) =>
               response?.lineBarSpots?.isEmpty ?? true
               ? SystemMouseCursors.basic
@@ -2737,30 +2755,18 @@ class _ChartPreviewState extends State<_ChartPreview> {
             fitInsideHorizontally: true,
             fitInsideVertically: true,
             getTooltipColor: (_) => const Color(0xFF0F172A),
+            // Show every dot near the cursor. When several dots sit on (almost)
+            // the same spot they all appear; the font shrinks to keep them
+            // readable when stacked.
             getTooltipItems: (spots) {
-              // When several series cross the same x, fl_chart hands us one
-              // spot per series. Only show the value of the point closest to
-              // the cursor instead of stacking every series vertically.
-              var nearest = 0;
-              var best = double.infinity;
-              for (var k = 0; k < spots.length; k++) {
-                final s = spots[k];
-                final d = s is TouchLineBarSpot ? s.distance : 0.0;
-                if (d < best) {
-                  best = d;
-                  nearest = k;
-                }
-              }
+              final style = _lineTooltipStyle(spots.length);
               return [
-                for (var k = 0; k < spots.length; k++)
-                  if (k != nearest)
-                    null
-                  else
-                    LineTooltipItem(
-                      '${spots[k].spotIndex < spec.x.length ? spec.x[spots[k].spotIndex] : ''}\n'
-                      '${spots[k].barIndex < spec.series.length && spec.series[spots[k].barIndex].name.isNotEmpty ? spec.series[spots[k].barIndex].name : 'Reeks ${spots[k].barIndex + 1}'}: ${_fmtNum(spots[k].y)}',
-                      _tooltipStyle(),
-                    ),
+                for (final spot in spots)
+                  LineTooltipItem(
+                    '${spot.spotIndex < spec.x.length ? spec.x[spot.spotIndex] : ''}\n'
+                    '${spot.barIndex < spec.series.length && spec.series[spot.barIndex].name.isNotEmpty ? spec.series[spot.barIndex].name : 'Reeks ${spot.barIndex + 1}'}: ${_fmtNum(spot.y)}',
+                    style,
+                  ),
               ];
             },
           ),
@@ -2880,6 +2886,195 @@ class _ChartPreviewState extends State<_ChartPreview> {
     );
   }
 
+  Widget _radarChart(ChartSpec spec, Color textColor) {
+    if (spec.x.length < 3 || spec.series.isEmpty) {
+      return _placeholderText(
+        context.l10n.d('Een spider-diagram heeft minstens drie labels nodig'),
+      );
+    }
+    final grid = textColor.withValues(alpha: 0.18);
+    final scale = radarScale(spec);
+    final bg = _hexColor(profile.slideBackgroundColor);
+
+    return Padding(
+      padding: EdgeInsets.symmetric(horizontal: w * 0.06, vertical: w * 0.012),
+      child: LayoutBuilder(
+        builder: (context, constraints) {
+          // A square keeps fl_chart's centre/radius predictable so the tick
+          // labels we overlay line up exactly with its grid rings.
+          final side = math.min(constraints.maxWidth, constraints.maxHeight);
+          final centerOffset = side / 2;
+          final radius = centerOffset * 0.8; // matches RadarChartPainter
+          final tickStyle = _applyFont(
+            font,
+            TextStyle(
+              fontSize: w * 0.012 * _labelScale,
+              color: textColor.withValues(alpha: 0.6),
+              fontWeight: FontWeight.w600,
+            ),
+          );
+
+          return Center(
+            child: SizedBox(
+              width: side,
+              height: side,
+              child: Stack(
+                children: [
+                  Positioned.fill(
+                    child: RadarChart(
+                      RadarChartData(
+                        dataSets: [
+                          for (var si = 0; si < spec.series.length; si++)
+                            RadarDataSet(
+                              dataEntries: [
+                                for (var xi = 0; xi < spec.x.length; xi++)
+                                  RadarEntry(
+                                    value: xi < spec.series[si].data.length
+                                        ? spec.series[si].data[xi]
+                                        : 0,
+                                  ),
+                              ],
+                              fillColor: _seriesDisplayColor(
+                                spec.series[si],
+                                si,
+                              ).withValues(alpha: _dimmed(si) ? 0.04 : 0.16),
+                              borderColor: _seriesDisplayColor(
+                                spec.series[si],
+                                si,
+                              ),
+                              borderWidth: w * (_hovered == si ? 0.0055 : 0.0035),
+                              entryRadius: w * (_hovered == si ? 0.006 : 0.004),
+                            ),
+                          // Invisible anchor pinning the scale to [lo, hi] so the
+                          // rings — and our labels — represent a fixed scale.
+                          RadarDataSet(
+                            dataEntries: [
+                              for (var xi = 0; xi < spec.x.length; xi++)
+                                RadarEntry(value: xi == 0 ? scale.hi : scale.lo),
+                            ],
+                            fillColor: Colors.transparent,
+                            borderColor: Colors.transparent,
+                            borderWidth: 0,
+                            entryRadius: 0,
+                          ),
+                        ],
+                        radarShape: RadarShape.polygon,
+                        radarBackgroundColor: Colors.transparent,
+                        radarBorderData: BorderSide(color: grid, width: 1),
+                        gridBorderData: BorderSide(color: grid, width: 1),
+                        tickBorderData: BorderSide(color: grid, width: 1),
+                        tickCount: scale.ticks,
+                        isMinValueAtCenter: true,
+                        // Hide fl_chart's own ring numbers; we draw labelled
+                        // ticks ourselves so any min/max scale reads correctly.
+                        ticksTextStyle: const TextStyle(
+                          color: Colors.transparent,
+                          fontSize: 0.001,
+                        ),
+                        titlePositionPercentageOffset: 0.14,
+                        getTitle: (index, angle) => RadarChartTitle(
+                          text: index < spec.x.length ? spec.x[index] : '',
+                        ),
+                        titleTextStyle: _applyFont(
+                          font,
+                          TextStyle(
+                            fontSize: w * 0.0135 * _labelScale,
+                            color: textColor.withValues(alpha: 0.88),
+                            fontWeight: presentationMode
+                                ? FontWeight.w600
+                                : FontWeight.w500,
+                          ),
+                        ),
+                        radarTouchData: RadarTouchData(enabled: false),
+                      ),
+                      duration: Duration.zero,
+                    ),
+                  ),
+                  // Evenly spaced scale labels up the top spoke: lo at centre,
+                  // hi at the outer ring, with equal steps between.
+                  for (var k = 0; k <= scale.ticks; k++)
+                    Positioned(
+                      left: centerOffset + w * 0.006,
+                      top:
+                          centerOffset -
+                          radius * k / scale.ticks -
+                          w * 0.01 * _labelScale,
+                      child: IgnorePointer(
+                        child: Container(
+                          padding: EdgeInsets.symmetric(
+                            horizontal: w * 0.004,
+                          ),
+                          color: bg.withValues(alpha: 0.7),
+                          child: Text(
+                            _fmtNum(scale.lo + (scale.hi - scale.lo) * k / scale.ticks),
+                            style: tickStyle,
+                          ),
+                        ),
+                      ),
+                    ),
+                ],
+              ),
+            ),
+          );
+        },
+      ),
+    );
+  }
+
+  /// Resolves the radar scale: a low/high pair plus an even tick count. Honours
+  /// the optional [ChartSpec.minBound]/[maxBound] and otherwise rounds the data
+  /// range to a tidy scale so the rings read as round numbers.
+  ({double lo, double hi, int ticks}) radarScale(ChartSpec spec) {
+    var dataMin = 0.0;
+    var dataMax = 0.0;
+    var seen = false;
+    for (final s in spec.series) {
+      for (final v in s.data) {
+        if (!seen) {
+          dataMin = v;
+          dataMax = v;
+          seen = true;
+        } else {
+          if (v < dataMin) dataMin = v;
+          if (v > dataMax) dataMax = v;
+        }
+      }
+    }
+    if (!seen) {
+      dataMin = 0;
+      dataMax = 1;
+    }
+    final rawLo = spec.minBound ?? (dataMin < 0 ? dataMin : 0);
+    final rawHi = spec.maxBound ?? dataMax;
+    final nice = _niceScale(rawLo, rawHi);
+    final lo = spec.minBound ?? nice.lo;
+    var hi = spec.maxBound ?? nice.hi;
+    if (hi <= lo) hi = lo + nice.step;
+    final ticks = math.max(2, ((hi - lo) / nice.step).round());
+    return (lo: lo, hi: hi, ticks: ticks);
+  }
+
+  ({double lo, double hi, double step}) _niceScale(double lo, double hi) {
+    final range = (hi - lo).abs();
+    final r = range <= 0 ? 1.0 : range;
+    final rawStep = r / 4;
+    final mag = math.pow(10, (math.log(rawStep) / math.ln10).floor()).toDouble();
+    final norm = rawStep / mag;
+    final niceNorm = norm < 1.5
+        ? 1.0
+        : norm < 3
+        ? 2.0
+        : norm < 7
+        ? 5.0
+        : 10.0;
+    final step = niceNorm * mag;
+    return (
+      lo: (lo / step).floor() * step,
+      hi: (hi / step).ceil() * step,
+      step: step,
+    );
+  }
+
   TextStyle _tooltipStyle() => _applyFont(
     font,
     TextStyle(
@@ -2890,6 +3085,22 @@ class _ChartPreviewState extends State<_ChartPreview> {
     ),
   );
 
+  /// Tooltip style for line charts. Each touched dot adds two lines, so when
+  /// several dots overlap the font shrinks a step to keep the stack readable.
+  TextStyle _lineTooltipStyle(int count) {
+    final base = (w * 0.013 * _labelScale).clamp(11.0, 18.0);
+    final shrink = (1 - (count - 2) * 0.13).clamp(0.6, 1.0);
+    return _applyFont(
+      font,
+      TextStyle(
+        color: Colors.white,
+        fontSize: (base * shrink).clamp(8.0, 18.0),
+        height: 1.2,
+        fontWeight: FontWeight.w700,
+      ),
+    );
+  }
+
   Widget _placeholder(BuildContext context) =>
       _placeholderText(context.l10n.d('Geen grafiekgegevens'));
 
diff --git a/test/app_localizations_test.dart b/test/app_localizations_test.dart
index 768e0f4..8d27921 100644
--- a/test/app_localizations_test.dart
+++ b/test/app_localizations_test.dart
@@ -50,6 +50,7 @@ void main() {
       'SLIDES',
       'Slide',
       'slide',
+      'Spider',
     };
     final expression = RegExp(r'''\.d\(\s*('(?:\\.|[^'])*'|"(?:\\.|[^"])*")''');
     final files = Directory('lib')
diff --git a/test/chart_preview_test.dart b/test/chart_preview_test.dart
index e69e4ac..ec6a0c4 100644
--- a/test/chart_preview_test.dart
+++ b/test/chart_preview_test.dart
@@ -151,6 +151,49 @@ void main() {
     expect(lineItems.single?.text, 'Februari\nBezoekers: 17.5');
   });
 
+  testWidgets('line tooltip uses true distance and shows every nearby dot', (
+    tester,
+  ) async {
+    const spec = ChartSpec(
+      type: ChartType.line,
+      x: ['Q1'],
+      series: [
+        ChartSeries(name: 'Alpha', data: [10], color: '#2563EB'),
+        ChartSeries(name: 'Beta', data: [10], color: '#EF4444'),
+        ChartSeries(name: 'Gamma', data: [10], color: '#10B981'),
+      ],
+    );
+    await tester.pumpWidget(_host(spec));
+    final line = tester.widget<LineChart>(find.byType(LineChart));
+    final touch = line.data.lineTouchData;
+
+    // Proximity is Euclidean (x AND y), not the x-only default.
+    expect(touch.distanceCalculator(Offset.zero, const Offset(3, 4)), 5);
+    expect(touch.touchSpotThreshold, greaterThan(0));
+
+    final spots = [
+      for (var i = 0; i < 3; i++)
+        LineBarSpot(
+          line.data.lineBarsData[i],
+          i,
+          line.data.lineBarsData[i].spots.single,
+        ),
+    ];
+    final items = touch.touchTooltipData.getTooltipItems(spots);
+    // All overlapping dots are shown (none filtered out).
+    expect(items.length, 3);
+    expect(items.whereType<LineTooltipItem>().length, 3);
+    expect(items[0]?.text, 'Q1\nAlpha: 10');
+    expect(items[2]?.text, 'Q1\nGamma: 10');
+
+    // A crowded stack uses a smaller font than a single tooltip.
+    final single = touch.touchTooltipData.getTooltipItems([spots.first]);
+    expect(
+      items[0]!.textStyle!.fontSize!,
+      lessThan(single.single!.textStyle!.fontSize!),
+    );
+  });
+
   testWidgets('pie hover shows the underlying category value', (tester) async {
     const spec = ChartSpec(
       type: ChartType.pie,
@@ -230,6 +273,83 @@ void main() {
     expect(tester.takeException(), isNull);
   });
 
+  testWidgets('radar chart renders a polygon per series with axis labels', (
+    tester,
+  ) async {
+    const spec = ChartSpec(
+      type: ChartType.radar,
+      x: ['Snelheid', 'Kracht', 'Uithouding'],
+      series: [
+        ChartSeries(name: 'Alpha', data: [3, 4, 5], color: '#2563EB'),
+        ChartSeries(name: 'Beta', data: [5, 2, 3], color: '#EF4444'),
+      ],
+    );
+
+    await tester.pumpWidget(_host(spec));
+    await tester.pump();
+
+    final radar = tester.widget<RadarChart>(find.byType(RadarChart));
+    // Two visible series plus one invisible scale anchor.
+    expect(radar.data.dataSets.length, 3);
+    expect(radar.data.dataSets.first.dataEntries.map((e) => e.value), [3, 4, 5]);
+    expect(radar.data.dataSets.last.fillColor, Colors.transparent);
+    // The spoke labels are supplied through getTitle (canvas-painted).
+    expect(radar.data.getTitle!(0, 0).text, 'Snelheid');
+    expect(radar.data.getTitle!(2, 0).text, 'Uithouding');
+    // The series legend is shown as real text widgets.
+    expect(find.text('Alpha'), findsOneWidget);
+    expect(find.text('Beta'), findsOneWidget);
+    expect(tester.takeException(), isNull);
+  });
+
+  testWidgets('radar honours an explicit min/max scale with even ticks', (
+    tester,
+  ) async {
+    const spec = ChartSpec(
+      type: ChartType.radar,
+      x: ['A', 'B', 'C', 'D'],
+      series: [
+        ChartSeries(name: 'Score', data: [2, 4, 3, 5]),
+      ],
+      minBound: 0,
+      maxBound: 10,
+    );
+
+    await tester.pumpWidget(_host(spec));
+    await tester.pump();
+
+    final radar = tester.widget<RadarChart>(find.byType(RadarChart));
+    expect(radar.data.isMinValueAtCenter, isTrue);
+    // The hidden anchor pins the scale to [0, 10].
+    final anchor = radar.data.dataSets.last.dataEntries.map((e) => e.value);
+    expect(anchor.reduce((a, b) => a < b ? a : b), 0);
+    expect(anchor.reduce((a, b) => a > b ? a : b), 10);
+    // Evenly spaced scale labels are drawn (0..10).
+    expect(find.text('0'), findsWidgets);
+    expect(find.text('10'), findsOneWidget);
+    expect(tester.takeException(), isNull);
+  });
+
+  testWidgets('radar chart asks for at least three labels', (tester) async {
+    const spec = ChartSpec(
+      type: ChartType.radar,
+      x: ['Een', 'Twee'],
+      series: [
+        ChartSeries(name: 'Alpha', data: [3, 4]),
+      ],
+    );
+
+    await tester.pumpWidget(_host(spec));
+    await tester.pump();
+
+    expect(find.byType(RadarChart), findsNothing);
+    expect(
+      find.text('Een spider-diagram heeft minstens drie labels nodig'),
+      findsOneWidget,
+    );
+    expect(tester.takeException(), isNull);
+  });
+
   testWidgets('presentation mode enlarges chart labels', (tester) async {
     const spec = ChartSpec(
       type: ChartType.bar,
diff --git a/test/chart_test.dart b/test/chart_test.dart
index b4da63e..d3b5702 100644
--- a/test/chart_test.dart
+++ b/test/chart_test.dart
@@ -130,5 +130,44 @@ void main() {
       expect(back.minBound, isNull);
       expect(back.maxBound, isNull);
     });
+
+    test('round-trips a spider/radar chart type', () {
+      const spec = ChartSpec(
+        type: ChartType.radar,
+        x: ['Snelheid', 'Kracht', 'Uithouding'],
+        series: [
+          ChartSeries(name: 'A', data: [3, 4, 5]),
+        ],
+      );
+      final back = ChartSpec.parse(spec.toBlock());
+      expect(back.type, ChartType.radar);
+      expect(back.x, ['Snelheid', 'Kracht', 'Uithouding']);
+      expect(back.series.single.data, [3, 4, 5]);
+    });
+
+    test('radar keeps bounds as a scale but never draws bound lines', () {
+      const spec = ChartSpec(
+        type: ChartType.radar,
+        x: ['A', 'B', 'C'],
+        series: [ChartSeries(name: 'A', data: [1, 2, 3])],
+        minBound: 1,
+        maxBound: 5,
+      );
+      expect(spec.supportsBounds, isTrue);
+      expect(spec.supportsBoundLines, isFalse);
+      final back = ChartSpec.parse(spec.toBlock());
+      expect(back.minBound, 1);
+      expect(back.maxBound, 5);
+    });
+
+    test('bar/line draw bound lines but pie does not', () {
+      const bar = ChartSpec(type: ChartType.bar);
+      const line = ChartSpec(type: ChartType.line);
+      const pie = ChartSpec(type: ChartType.pie);
+      expect(bar.supportsBoundLines, isTrue);
+      expect(line.supportsBoundLines, isTrue);
+      expect(pie.supportsBoundLines, isFalse);
+      expect(pie.supportsBounds, isFalse);
+    });
   });
 }
diff --git a/test/code_preview_test.dart b/test/code_preview_test.dart
new file mode 100644
index 0000000..c3f3eff
--- /dev/null
+++ b/test/code_preview_test.dart
@@ -0,0 +1,83 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_highlight/flutter_highlight.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:ocideck/models/settings.dart';
+import 'package:ocideck/models/slide.dart';
+import 'package:ocideck/widgets/slides/slide_preview.dart';
+
+Widget _host(Slide slide, ThemeProfile profile) {
+  return Directionality(
+    textDirection: TextDirection.ltr,
+    child: Center(
+      child: SizedBox(
+        width: 800,
+        height: 450,
+        child: SlidePreviewWidget(slide: slide, themeProfile: profile),
+      ),
+    ),
+  );
+}
+
+Color _hex(String hex) =>
+    Color(int.parse(hex.substring(1), radix: 16) | 0xFF000000);
+
+void main() {
+  testWidgets('code slide paints the themed background colour', (tester) async {
+    final slide = Slide.create(
+      SlideType.code,
+    ).copyWith(codeLanguage: 'dart', customMarkdown: 'void main() {}');
+    const profile = ThemeProfile(
+      codeBackgroundColor: '#000000',
+      codeTextColor: '#33FF33',
+    );
+
+    await tester.pumpWidget(_host(slide, profile));
+    await tester.pump();
+
+    // The code panel uses the themed background somewhere in its decoration.
+    final painted = tester.widgetList<Container>(find.byType(Container)).where((
+      c,
+    ) {
+      final d = c.decoration;
+      return d is BoxDecoration && d.color == _hex('#000000');
+    });
+    expect(painted, isNotEmpty);
+    expect(tester.takeException(), isNull);
+  });
+
+  testWidgets('syntax highlighting on uses HighlightView for a known language', (
+    tester,
+  ) async {
+    final slide = Slide.create(
+      SlideType.code,
+    ).copyWith(codeLanguage: 'dart', customMarkdown: 'void main() {}');
+    const profile = ThemeProfile(codeHighlightSyntax: true);
+
+    await tester.pumpWidget(_host(slide, profile));
+    await tester.pump();
+
+    expect(find.byType(HighlightView), findsOneWidget);
+  });
+
+  testWidgets('syntax highlighting off renders monochrome (CRT) text', (
+    tester,
+  ) async {
+    final slide = Slide.create(
+      SlideType.code,
+    ).copyWith(codeLanguage: 'dart', customMarkdown: 'void main() {}');
+    const profile = ThemeProfile(
+      codeBackgroundColor: '#000000',
+      codeTextColor: '#33FF33',
+      codeHighlightSyntax: false,
+    );
+
+    await tester.pumpWidget(_host(slide, profile));
+    await tester.pump();
+
+    // No per-token highlighting; the code is one flat colour.
+    expect(find.byType(HighlightView), findsNothing);
+    final codeText = tester.widget<Text>(find.text('void main() {}'));
+    expect(codeText.style?.color, _hex('#33FF33'));
+    expect(tester.takeException(), isNull);
+  });
+}
diff --git a/test/marp_html_service_test.dart b/test/marp_html_service_test.dart
index 4c7f4d6..8afd516 100644
--- a/test/marp_html_service_test.dart
+++ b/test/marp_html_service_test.dart
@@ -98,6 +98,21 @@ void main() {}
     expect(html, isNot(contains('data:font/ttf;base64,')));
   });
 
+  test('code blocks use the themed code colours in the export CSS', () async {
+    final service = MarpHtmlService(
+      loadAsset: _diskLoader,
+      loadBytes: _diskBytes,
+    );
+    const theme = ThemeProfile(
+      codeBackgroundColor: '#000000',
+      codeTextColor: '#33FF33',
+    );
+    final html = await service.build('```dart\nvoid main() {}\n```', theme: theme);
+
+    expect(html, contains('.slide pre{background:#000000;color:#33FF33'));
+    expect(html, contains('.slide pre code{color:#33FF33'));
+  });
+
   test('EB Garamond theme embeds the font for offline rendering', () async {
     final service = MarpHtmlService(
       loadAsset: _diskLoader,
@@ -195,4 +210,32 @@ void main() {}
     expect(html, isNot(contains('stroke-dasharray')));
     expect(html, isNot(contains('min 5')));
   });
+
+  test('radar chart SVG draws a polygon per series with axis labels', () {
+    const slide = '''
+```chart
+{
+  "type": "radar",
+  "x": ["Snelheid", "Kracht", "Uithouding"],
+  "series": [
+    {"name": "A", "color": "#2563EB", "data": [3, 4, 5]},
+    {"name": "B", "color": "#EF4444", "data": [5, 2, 3]}
+  ]
+}
+```
+''';
+
+    final html = MarpHtmlService.renderChartBlocks(slide);
+
+    expect(html, contains('<polygon'));
+    expect(html, contains('Snelheid'));
+    expect(html, contains('Kracht'));
+    expect(html, contains('Uithouding'));
+    // Both series are drawn with their colours.
+    expect(html, contains('fill="#2563EB"'));
+    expect(html, contains('fill="#EF4444"'));
+    // The series legend is shown (not a pie legend).
+    expect(html, contains('A'));
+    expect(html, contains('B'));
+  });
 }
diff --git a/test/settings_provider_test.dart b/test/settings_provider_test.dart
index d9a644a..a0249b3 100644
--- a/test/settings_provider_test.dart
+++ b/test/settings_provider_test.dart
@@ -15,6 +15,26 @@ Future<SettingsNotifier> _loadedNotifier() async {
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
 
+  test('ThemeProfile round-trips the code colours through JSON', () {
+    const profile = ThemeProfile(
+      codeBackgroundColor: '#000000',
+      codeTextColor: '#33FF33',
+      codeHighlightSyntax: false,
+    );
+    final back = ThemeProfile.fromJson(profile.toJson());
+    expect(back.codeBackgroundColor, '#000000');
+    expect(back.codeTextColor, '#33FF33');
+    expect(back.codeHighlightSyntax, isFalse);
+  });
+
+  test('ThemeProfile code colours default to the atom-one-dark look', () {
+    // Older decks without the fields fall back to the dark editor defaults.
+    final back = ThemeProfile.fromJson(const {'name': 'Legacy'});
+    expect(back.codeBackgroundColor, '#282C34');
+    expect(back.codeTextColor, '#ABB2BF');
+    expect(back.codeHighlightSyntax, isTrue);
+  });
+
   test('starts with a single default profile', () async {
     final notifier = await _loadedNotifier();
     expect(notifier.state.themeProfiles, hasLength(1));