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new file mode 100644
index 0000000..28041fc
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index a5e4d0c..9e241a1 100644
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@@ -8,9 +8,20 @@
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+                    "type": "liberapay"
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+                    "type": "thanks_dev"
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+        },
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+                "sebastian/recursion-context": "^6.0"
+            },
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+                "ext-dom": "*",
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+            },
+            "type": "library",
+            "extra": {
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+                    "dev-main": "7.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "https://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/global-state/issues",
+                "security": "https://github.com/sebastianbergmann/global-state/security/policy",
+                "source": "https://github.com/sebastianbergmann/global-state/tree/7.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T04:57:36+00:00"
+        },
+        {
+            "name": "sebastian/lines-of-code",
+            "version": "3.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/lines-of-code.git",
+                "reference": "d36ad0d782e5756913e42ad87cb2890f4ffe467a"
+            },
+            "dist": {
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+                "url": "https://api.github.com/repos/sebastianbergmann/lines-of-code/zipball/d36ad0d782e5756913e42ad87cb2890f4ffe467a",
+                "reference": "d36ad0d782e5756913e42ad87cb2890f4ffe467a",
+                "shasum": ""
+            },
+            "require": {
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+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library for counting the lines of code in PHP source code",
+            "homepage": "https://github.com/sebastianbergmann/lines-of-code",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
+                "security": "https://github.com/sebastianbergmann/lines-of-code/security/policy",
+                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/3.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T04:58:38+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "6.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "f5b498e631a74204185071eb41f33f38d64608aa"
+            },
+            "dist": {
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+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/f5b498e631a74204185071eb41f33f38d64608aa",
+                "reference": "f5b498e631a74204185071eb41f33f38d64608aa",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2",
+                "sebastian/object-reflector": "^4.0",
+                "sebastian/recursion-context": "^6.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "security": "https://github.com/sebastianbergmann/object-enumerator/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/6.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T05:00:13+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "4.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "6e1a43b411b2ad34146dee7524cb13a068bb35f9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/6e1a43b411b2ad34146dee7524cb13a068bb35f9",
+                "reference": "6e1a43b411b2ad34146dee7524cb13a068bb35f9",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "security": "https://github.com/sebastianbergmann/object-reflector/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/4.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T05:01:32+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "6.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "f6458abbf32a6c8174f8f26261475dc133b3d9dc"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/f6458abbf32a6c8174f8f26261475dc133b3d9dc",
+                "reference": "f6458abbf32a6c8174f8f26261475dc133b3d9dc",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "https://github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "security": "https://github.com/sebastianbergmann/recursion-context/security/policy",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/6.0.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                },
+                {
+                    "url": "https://liberapay.com/sebastianbergmann",
+                    "type": "liberapay"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
+                    "type": "thanks_dev"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/sebastian/recursion-context",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-08-13T04:42:22+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "5.1.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "f77d2d4e78738c98d9a68d2596fe5e8fa380f449"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/f77d2d4e78738c98d9a68d2596fe5e8fa380f449",
+                "reference": "f77d2d4e78738c98d9a68d2596fe5e8fa380f449",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "security": "https://github.com/sebastianbergmann/type/security/policy",
+                "source": "https://github.com/sebastianbergmann/type/tree/5.1.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                },
+                {
+                    "url": "https://liberapay.com/sebastianbergmann",
+                    "type": "liberapay"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
+                    "type": "thanks_dev"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/sebastian/type",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-08-09T06:55:48+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "5.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "c687e3387b99f5b03b6caa64c74b63e2936ff874"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/c687e3387b99f5b03b6caa64c74b63e2936ff874",
+                "reference": "c687e3387b99f5b03b6caa64c74b63e2936ff874",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "security": "https://github.com/sebastianbergmann/version/security/policy",
+                "source": "https://github.com/sebastianbergmann/version/tree/5.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-10-09T05:16:32+00:00"
+        },
+        {
+            "name": "staabm/side-effects-detector",
+            "version": "1.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/staabm/side-effects-detector.git",
+                "reference": "d8334211a140ce329c13726d4a715adbddd0a163"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/staabm/side-effects-detector/zipball/d8334211a140ce329c13726d4a715adbddd0a163",
+                "reference": "d8334211a140ce329c13726d4a715adbddd0a163",
+                "shasum": ""
+            },
+            "require": {
+                "ext-tokenizer": "*",
+                "php": "^7.4 || ^8.0"
+            },
+            "require-dev": {
+                "phpstan/extension-installer": "^1.4.3",
+                "phpstan/phpstan": "^1.12.6",
+                "phpunit/phpunit": "^9.6.21",
+                "symfony/var-dumper": "^5.4.43",
+                "tomasvotruba/type-coverage": "1.0.0",
+                "tomasvotruba/unused-public": "1.0.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "lib/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "A static analysis tool to detect side effects in PHP code",
+            "keywords": [
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/staabm/side-effects-detector/issues",
+                "source": "https://github.com/staabm/side-effects-detector/tree/1.0.5"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/staabm",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-10-20T05:08:20+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.2.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:36:25+00:00"
+        }
+    ],
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": {},
diff --git a/src/index.php b/src/index.php
index 0cc8fa3..995edbf 100644
--- a/src/index.php
+++ b/src/index.php
@@ -13,7 +13,7 @@
 
         body {
             font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
-            background: #f5f7fa;
+            background: #ffe4e9;
             padding: 20px;
         }
 
diff --git a/tests/Integration/CrawlerIntegrationTest.php b/tests/Integration/CrawlerIntegrationTest.php
new file mode 100644
index 0000000..af5d84e
--- /dev/null
+++ b/tests/Integration/CrawlerIntegrationTest.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace Tests\Integration;
+
+use PHPUnit\Framework\TestCase;
+use App\Crawler;
+use App\Database;
+
+class CrawlerIntegrationTest extends TestCase
+{
+    private int $testJobId;
+    private \PDO $db;
+
+    protected function setUp(): void
+    {
+        $this->db = Database::getInstance();
+
+        // Create a test job
+        $stmt = $this->db->prepare("INSERT INTO crawl_jobs (domain, status) VALUES (?, 'pending')");
+        $stmt->execute(['https://httpbin.org']);
+        $this->testJobId = $this->db->lastInsertId();
+    }
+
+    protected function tearDown(): void
+    {
+        // Clean up test data
+        $stmt = $this->db->prepare("DELETE FROM crawl_jobs WHERE id = ?");
+        $stmt->execute([$this->testJobId]);
+    }
+
+    public function testCrawlerUpdatesJobStatusToRunning(): void
+    {
+        $crawler = new Crawler($this->testJobId);
+
+        // Start crawl (will fail but should update status)
+        try {
+            $crawler->start('https://httpbin.org/html');
+        } catch (\Exception $e) {
+            // Expected to fail in test environment
+        }
+
+        $stmt = $this->db->prepare("SELECT status FROM crawl_jobs WHERE id = ?");
+        $stmt->execute([$this->testJobId]);
+        $job = $stmt->fetch();
+
+        // Status should be either 'running' or 'completed'
+        $this->assertContains($job['status'], ['running', 'completed', 'failed']);
+    }
+
+    public function testCrawlerCreatesQueueEntries(): void
+    {
+        $crawler = new Crawler($this->testJobId);
+
+        try {
+            $crawler->start('https://httpbin.org/html');
+        } catch (\Exception $e) {
+            // Expected to fail in test environment
+        }
+
+        $stmt = $this->db->prepare("SELECT COUNT(*) as count FROM crawl_queue WHERE crawl_job_id = ?");
+        $stmt->execute([$this->testJobId]);
+        $result = $stmt->fetch();
+
+        $this->assertGreaterThan(0, $result['count']);
+    }
+}
diff --git a/tests/Unit/CrawlerTest.php b/tests/Unit/CrawlerTest.php
new file mode 100644
index 0000000..3794a20
--- /dev/null
+++ b/tests/Unit/CrawlerTest.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace Tests\Unit;
+
+use PHPUnit\Framework\TestCase;
+use App\Crawler;
+use App\Database;
+
+class CrawlerTest extends TestCase
+{
+    private int $testJobId;
+
+    protected function setUp(): void
+    {
+        $db = Database::getInstance();
+
+        // Create a test job
+        $stmt = $db->prepare("INSERT INTO crawl_jobs (domain, status) VALUES (?, 'pending')");
+        $stmt->execute(['https://example.com']);
+        $this->testJobId = $db->lastInsertId();
+    }
+
+    protected function tearDown(): void
+    {
+        $db = Database::getInstance();
+
+        // Clean up test data
+        $stmt = $db->prepare("DELETE FROM crawl_jobs WHERE id = ?");
+        $stmt->execute([$this->testJobId]);
+    }
+
+    public function testCrawlerCanBeInstantiated(): void
+    {
+        $crawler = new Crawler($this->testJobId);
+        $this->assertInstanceOf(Crawler::class, $crawler);
+    }
+
+    public function testCrawlerCreatesJobWithCorrectStatus(): void
+    {
+        $db = Database::getInstance();
+
+        $stmt = $db->prepare("SELECT status FROM crawl_jobs WHERE id = ?");
+        $stmt->execute([$this->testJobId]);
+        $job = $stmt->fetch();
+
+        $this->assertEquals('pending', $job['status']);
+    }
+}
diff --git a/tests/Unit/DatabaseTest.php b/tests/Unit/DatabaseTest.php
new file mode 100644
index 0000000..adfcec8
--- /dev/null
+++ b/tests/Unit/DatabaseTest.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Tests\Unit;
+
+use PHPUnit\Framework\TestCase;
+use App\Database;
+use PDO;
+
+class DatabaseTest extends TestCase
+{
+    public function testGetInstanceReturnsPDO(): void
+    {
+        $db = Database::getInstance();
+        $this->assertInstanceOf(PDO::class, $db);
+    }
+
+    public function testGetInstanceReturnsSameInstance(): void
+    {
+        $db1 = Database::getInstance();
+        $db2 = Database::getInstance();
+        $this->assertSame($db1, $db2);
+    }
+
+    public function testDatabaseConnectionHasCorrectAttributes(): void
+    {
+        $db = Database::getInstance();
+
+        // Test error mode
+        $this->assertEquals(
+            PDO::ERRMODE_EXCEPTION,
+            $db->getAttribute(PDO::ATTR_ERRMODE)
+        );
+
+        // Test fetch mode
+        $this->assertEquals(
+            PDO::FETCH_ASSOC,
+            $db->getAttribute(PDO::ATTR_DEFAULT_FETCH_MODE)
+        );
+    }
+
+    public function testCanExecuteQuery(): void
+    {
+        $db = Database::getInstance();
+        $stmt = $db->query('SELECT 1 as test');
+        $result = $stmt->fetch();
+
+        $this->assertEquals(['test' => 1], $result);
+    }
+
+    public function testCanPrepareStatement(): void
+    {
+        $db = Database::getInstance();
+        $stmt = $db->prepare('SELECT ? as test');
+
+        $this->assertInstanceOf(\PDOStatement::class, $stmt);
+    }
+}