const CUSTOM_CSS_ELEMENT_ID = 'media-views-important';

const processRules = (rules) => {
	const result = [];

	[...rules].forEach((rule) => {
		switch (rule.type) {
			case CSSRule.STYLE_RULE:
				result.push(addImportant(rule));
				break;
			case CSSRule.MEDIA_RULE:
				result.push(`@media ${rule.conditionText} {`);
				processRules(rule.cssRules, result);
				result.push('}');
				break;
			default:
				result.push(rule.cssText);
				break;
		}
	});

	return result;
};

const addImportant = (rule) => {
	const declarations = [...rule.style].map(
		(prop) => `${prop}: ${rule.style.getPropertyValue(prop)} !important`,
	);

	return `${rule.selectorText} { ${declarations.join('; ')}; }`;
};

const getCustomMediaViewsCss = () => {
	const link = document.getElementById('media-views-css');
	if (!link) return null;

	const processedRules = processRules(link.sheet?.cssRules);

	if (!processedRules?.length) return null;

	const css = processedRules.join('\n');

	const additionalCSS = `
			div:has(> .media-modal) {z-index: 999999 !important}
			.media-frame {
				h1, h2, h3, h4, h5, h6 {
					font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif !important;
					color: #1d2327 !important;
				}

				.uploader-inline-content {
					color: #1d2327 !important;
				}

				.media-sidebar {
					color: #646970 !important;
				}

				.media-search-input-label,
				.load-more-count {
					color: #3c434a !important;
				}
			}
		`;

	return `${additionalCSS} ${css}`;
};

export const addCustomMediaViewsCss = () => {
	if (document.getElementById(CUSTOM_CSS_ELEMENT_ID)) return;

	const css = getCustomMediaViewsCss();

	if (!css) return;

	const style = document.createElement('style');

	style.id = CUSTOM_CSS_ELEMENT_ID;
	style.textContent = css;

	document.head.appendChild(style);
};

export const removeCustomMediaViewsCss = () => {
	const style = document.getElementById(CUSTOM_CSS_ELEMENT_ID);

	if (style) style.remove();
};
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