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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Futuristic AI Login</title>
    <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap" rel="stylesheet">
    <style>
        body {
            margin: 0;
            padding: 0;
            background: #111;
            font-family: 'Poppins', sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            color: #fff;
     	    overfolow:hidden;
        }

.login-container {
            width: 350px;
            padding: 30px;
            border-radius: 15px;
            background: black;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
            text-align: center;
            backdrop-filter: blur(10px);
      
        }

h1 {
            font-size: 30px;
            margin-bottom: 20px;
            font-weight: 600;
            letter-spacing: 1px;
            text-transform: uppercase;
            color: white;
        }

.input-field {
            margin-bottom: 20px;
            position: relative;
        }

.input-field input {
            width: 100%;
            padding: 12px;
            border: none;
            border-radius: 8px;
            background: rgba(255, 255, 255, 0.1);
            color: black;
            font-size: 16px;
            outline: none;
            box-sizing: border-box;
            transition: all 0.3s ease-in-out;
        }

.input-field input:focus {
            background: rgba(255, 255, 255, 0.3);
            border: 1px solid #6a3edc;
        }

.login-btn {
            width: 100%;
            padding: 12px;
            background: #6a3edc;
            color: black;
            border: none;
            border-radius: 8px;
            font-size: 18px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
        }

.login-btn:hover {
            background: #3b4cca;
            transform: scale(1.05);
        }

.forgot-password {
            margin-top: 10px;
            font-size: 14px;
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s ease;
        }

.forgot-password:hover {
            color: #fff;
        }

.background-effect {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.15), rgba(0, 0, 0, 0.6));
            z-index: -1;
            animation: pulse 3s infinite;
        }

@keyframes pulse {
            0% {
                transform: scale(1);
            }
            50% {
                transform: scale(1.0);
            }
            100% {
                transform: scale(1);
            }
        }

.animate-border {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            border-radius: 15px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            animation: border-animation 3s infinite;
        }

@keyframes border-animation {
            0% {
                transform: scale(1);
            }
            50% {
                transform: scale(1.05);
            }
            100% {
                transform: scale(1);
            }
        }
    </style>
</head>
<body>

<div class="login-container">
    <div class="animate-border"></div>
    <h1>Login</h1>
    <div class="input-field">
        <input type="text" id="username" placeholder="Username" required>
    </div>
    <div class="input-field">
        <input type="password" id="password" placeholder="Password" required>
    </div>
    <button class="login-btn" onclick="login()">Log In</button>
    <a href="#" class="forgot-password">Forgot password?</a>
</div>

if (username === "" || password === "") {
            alert("Please fill out both fields.");
        } else {
            alert("Login Successful!");
        }
    }
</script>

</body>
</html>

CSS