refactor: complete ‘Reference Container’ settings group

src/includes/settings/class-custom-css-settings-section.php

@@ -0,0 +1,62 @@
+<?php
+/**
+ * File providing the `CustomCSSSettingsSection` class.
+ *
+ * @package footnotes
+ * @since 2.8.0
+ */
+
+declare(strict_types=1);
+
+namespace footnotes\includes\settings;
+
+require_once plugin_dir_path( __DIR__ ) . 'settings/class-settings-section.php';
+
+// Import settings groups.
+//use footnotes\includes\settings\custom-css\...;
+
+/**
+ * Class defining plugin referrer and tooltips settings.
+ *
+ * @package footnotes
+ * @since 2.8.0
+ */
+class CustomCSSSettingsSection extends SettingsSection {	
+	/**
+	 * The groups of settings within this section.
+	 *
+	 * @var  SettingsGroup[]
+	 *
+	 * @since  2.8.0
+	 */
+	protected array $settings_groups;
+	
+	public function __construct(
+		$options_group_slug,
+		$section_slug,
+		$title
+	) {
+		$this->options_group_slug = $options_group_slug;
+		$this->section_slug = $section_slug;
+		$this->title = $title;
+				
+		$this->load_dependencies();
+		
+		$this->add_settings_groups(get_option( $this->options_group_slug ));
+
+		$this->load_options_group();
+	}
+	
+	protected function load_dependencies(): void {
+		require_once plugin_dir_path( __DIR__ ) . 'settings/class-setting.php';
+		// Require settings groups.
+		//require_once plugin_dir_path( __DIR__ ) . 'settings/custom-css/...';
+	}
+	
+	protected function add_settings_groups(): void {
+		$this->settings_groups = array (
+			// Add settings groups.
+			//...::GROUP_ID => new ...($this->options_group_slug, $this->section_slug),
+		);
+	}
+}