{
	"$schema": "../schemas/code-crispies-module-schema.json",
	"id": "css-filters",
	"title": "CSS Filters",
	"description": "Apply visual effects like blur, brightness, and shadows with CSS filters.",
	"difficulty": "intermediate",
	"lessons": [
		{
			"id": "filters-1",
			"title": "Blur Filter",
			"description": "The <kbd>filter</kbd> property applies visual effects to elements. The <kbd>blur()</kbd> function creates a Gaussian blur effect.<br><br><pre>filter: blur(4px);</pre><br>Higher values create more blur. This is great for backgrounds or creating depth.",
			"task": "Blur the background image to create a frosted-glass effect. Use a blur radius between 2px and 8px.",
			"previewHTML": "<div class=\"bg\"></div><div class=\"content\"><h2>Welcome</h2></div>",
			"previewBaseCSS": "body { font-family: system-ui, sans-serif; margin: 0; height: 200px; position: relative; overflow: hidden; } .bg { position: absolute; inset: 0; background: linear-gradient(45deg, coral, gold, steelblue); } .content { position: relative; z-index: 1; display: flex; align-items: center; justify-content: center; height: 100%; } .content h2 { color: white; text-shadow: 0 2px 8px rgba(0,0,0,0.3); margin: 0; }",
			"sandboxCSS": "",
			"codePrefix": ".bg {\n  ",
			"initialCode": "",
			"codeSuffix": "\n}",
			"solution": "filter: blur(4px);",
			"previewContainer": "preview-area",
			"validations": [
				{
					"type": "regex",
					"value": "filter:\\s*blur\\((2|3|4|5|6|7|8)px\\)",
					"message": "Use the <kbd>filter</kbd> property with the <kbd>blur()</kbd> function. Try a value between 2px and 8px",
					"options": { "caseSensitive": false }
				}
			]
		},
		{
			"id": "filters-2",
			"title": "Grayscale Filter",
			"description": "The <kbd>grayscale()</kbd> function removes color from an element. Use values from <kbd>0%</kbd> (full color) to <kbd>100%</kbd> (fully grayscale).<br><br><pre>filter: grayscale(100%);</pre><br>Great for hover effects or disabled states.",
			"task": "Remove all color from the image to create a black-and-white effect.",
			"previewHTML": "<div class=\"photo\"></div>",
			"previewBaseCSS": "body { font-family: system-ui, sans-serif; padding: 1rem; } .photo { width: 200px; height: 150px; background: linear-gradient(135deg, coral 0%, gold 50%, steelblue 100%); border-radius: 8px; }",
			"sandboxCSS": "",
			"codePrefix": ".photo {\n  ",
			"initialCode": "",
			"codeSuffix": "\n}",
			"solution": "filter: grayscale(100%);",
			"previewContainer": "preview-area",
			"validations": [
				{
					"type": "regex",
					"value": "filter:\\s*grayscale\\(100%\\)",
					"message": "Which filter function removes color from an element? Set it to full strength",
					"options": { "caseSensitive": false }
				}
			]
		},
		{
			"id": "filters-3",
			"title": "Brightness Filter",
			"description": "The <kbd>brightness()</kbd> function adjusts how bright an element appears. Values below <kbd>100%</kbd> darken, above <kbd>100%</kbd> brighten.<br><br><pre>filter: brightness(150%);</pre>",
			"task": "Make the card appear brighter and more vivid. Use a brightness value between 110% and 150%.",
			"previewHTML": "<div class=\"card\"><span>Featured</span></div>",
			"previewBaseCSS": "body { font-family: system-ui, sans-serif; padding: 1rem; background: #1a1a2e; } .card { padding: 2rem; background: linear-gradient(135deg, #4a4a6a, #2a2a4a); border-radius: 12px; text-align: center; } .card span { color: gold; font-weight: 600; text-transform: uppercase; letter-spacing: 2px; }",
			"sandboxCSS": "",
			"codePrefix": ".card {\n  ",
			"initialCode": "",
			"codeSuffix": "\n}",
			"solution": "filter: brightness(120%);",
			"previewContainer": "preview-area",
			"validations": [
				{
					"type": "regex",
					"value": "filter:\\s*brightness\\(1[1-5]0%\\)",
					"message": "Use the <kbd>filter</kbd> property with the <kbd>brightness()</kbd> function. Values above 100% make things brighter",
					"options": { "caseSensitive": false }
				}
			]
		},
		{
			"id": "filters-4",
			"title": "Drop Shadow",
			"description": "The <kbd>drop-shadow()</kbd> filter creates a shadow that follows the shape of the element, including transparency. Unlike <kbd>box-shadow</kbd>, it works on images with transparent backgrounds.<br><br><pre>filter: drop-shadow(2px 4px 6px black);</pre>",
			"task": "Add a soft shadow behind the star to give it depth. Use the drop-shadow filter with offset, blur, and a color.",
			"previewHTML": "<div class=\"icon\">★</div>",
			"previewBaseCSS": "body { font-family: system-ui, sans-serif; padding: 2rem; display: flex; justify-content: center; } .icon { font-size: 4rem; color: gold; }",
			"sandboxCSS": "",
			"codePrefix": ".icon {\n  ",
			"initialCode": "",
			"codeSuffix": "\n}",
			"solution": "filter: drop-shadow(4px 4px 8px gray);",
			"previewContainer": "preview-area",
			"validations": [
				{
					"type": "regex",
					"value": "filter:\\s*drop-shadow\\(\\d+px\\s+\\d+px\\s+\\d+px\\s+\\w+\\)",
					"message": "Use the <kbd>filter</kbd> property with <kbd>drop-shadow()</kbd>. It needs horizontal offset, vertical offset, blur radius, and a color",
					"options": { "caseSensitive": false }
				}
			]
		}
	]
}