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src/app/auth/error/page.js

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+export default function AuthError() {
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-gray-50 py-12 px-4 sm:px-6 lg:px-8">
+      <div className="max-w-md w-full space-y-8">
+        <div className="text-center">
+          <h2 className="mt-6 text-3xl font-extrabold text-gray-900">
+            Authentication Error
+          </h2>
+          <p className="mt-2 text-sm text-gray-600">
+            There was a problem signing you in. Please try again.
+          </p>
+          <div className="mt-6">
+            <a
+              href="/auth/signin"
+              className="inline-flex items-center px-4 py-2 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700"
+            >
+              Back to Sign In
+            </a>
+          </div>
+        </div>
+      </div>
+    </div>
+  )
+}

src/app/auth/signin/page.js

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+"use client"
+
+import { useState } from "react"
+import { signIn, getSession } from "next-auth/react"
+import { useRouter } from "next/navigation"
+import { useSearchParams } from "next/navigation"
+
+export default function SignIn() {
+  const [email, setEmail] = useState("")
+  const [password, setPassword] = useState("")
+  const [error, setError] = useState("")
+  const [isLoading, setIsLoading] = useState(false)
+  const router = useRouter()
+  const searchParams = useSearchParams()
+  const callbackUrl = searchParams.get("callbackUrl") || "/"
+
+  const handleSubmit = async (e) => {
+    e.preventDefault()
+    setIsLoading(true)
+    setError("")
+
+    try {
+      const result = await signIn("credentials", {
+        email,
+        password,
+        redirect: false,
+      })
+
+      if (result?.error) {
+        setError("Invalid email or password")
+      } else {
+        // Successful login
+        router.push(callbackUrl)
+        router.refresh()
+      }
+    } catch (error) {
+      setError("An error occurred. Please try again.")
+    } finally {
+      setIsLoading(false)
+    }
+  }
+
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-gray-50 py-12 px-4 sm:px-6 lg:px-8">
+      <div className="max-w-md w-full space-y-8">
+        <div>
+          <h2 className="mt-6 text-center text-3xl font-extrabold text-gray-900">
+            Sign in to your account
+          </h2>
+          <p className="mt-2 text-center text-sm text-gray-600">
+            Access the Project Management Panel
+          </p>
+        </div>
+        <form className="mt-8 space-y-6" onSubmit={handleSubmit}>
+          {error && (
+            <div className="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded relative">
+              {error}
+            </div>
+          )}
+          
+          <div className="rounded-md shadow-sm -space-y-px">
+            <div>
+              <label htmlFor="email" className="sr-only">
+                Email address
+              </label>
+              <input
+                id="email"
+                name="email"
+                type="email"
+                autoComplete="email"
+                required
+                className="appearance-none rounded-none relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-t-md focus:outline-none focus:ring-blue-500 focus:border-blue-500 focus:z-10 sm:text-sm"
+                placeholder="Email address"
+                value={email}
+                onChange={(e) => setEmail(e.target.value)}
+              />
+            </div>
+            <div>
+              <label htmlFor="password" className="sr-only">
+                Password
+              </label>
+              <input
+                id="password"
+                name="password"
+                type="password"
+                autoComplete="current-password"
+                required
+                className="appearance-none rounded-none relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-b-md focus:outline-none focus:ring-blue-500 focus:border-blue-500 focus:z-10 sm:text-sm"
+                placeholder="Password"
+                value={password}
+                onChange={(e) => setPassword(e.target.value)}
+              />
+            </div>
+          </div>
+
+          <div>
+            <button
+              type="submit"
+              disabled={isLoading}
+              className="group relative w-full flex justify-center py-2 px-4 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 disabled:opacity-50 disabled:cursor-not-allowed"
+            >
+              {isLoading ? (
+                <span className="flex items-center">
+                  <svg className="animate-spin -ml-1 mr-3 h-5 w-5 text-white" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
+                    <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4"></circle>
+                    <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
+                  </svg>
+                  Signing in...
+                </span>
+              ) : (
+                "Sign in"
+              )}
+            </button>
+          </div>
+
+          <div className="text-center">
+            <div className="text-sm text-gray-600 bg-blue-50 p-3 rounded">
+              <p className="font-medium">Default Admin Account:</p>
+              <p>Email: admin@localhost</p>
+              <p>Password: admin123456</p>
+            </div>
+          </div>
+        </form>
+      </div>
+    </div>
+  )
+}