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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>Advanced Sign In</title>
    <style>
        /* Reset and Base Styles */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

body {
            font-family: 'Poppins', sans-serif; /* More modern font */
            background: linear-gradient(135deg, #4e54c8, #8f94fb); /* Gradient background */
            color: #fff;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            overflow: hidden; /* Prevent scrollbars if content overflows */
        }

.container {
            position: relative;
            width: 80%;
            max-width: 800px;  /* Larger container */
            min-height: 500px;  /* Taller container */
            background: rgba(255, 255, 255, 0.1);  /* Semi-transparent white background */
            backdrop-filter: blur(15px);  /* Glassmorphism blur effect – Works in modern browsers */
            border-radius: 20px; /* More rounded corners */
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2); /* Stronger shadow */
            display: flex;
            overflow: hidden;
             border: 2px solid rgba(255,255,255,0.25); /* subtle border */
        }

.form-container {
            width: 50%; /* Split into two halves */
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            z-index: 2; /* Ensure form is above background elements */
        }

.image-container {
          width: 50%;
          background-image: url('https://images.unsplash.com/photo-1519750783826-e2420f4d687f?q=80&w=1974&auto=format&fit=crop&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D'); /* add background */
          background-size: cover;
          background-position: center;
        }

h2 {
            text-align: center;
            font-size: 2.5em;
            margin-bottom: 30px;
            color: #fff; /* White text for better contrast */
            text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3); /* Text shadow for depth */
        }

/* Form Input Styles */
        .form-group {
            position: relative; /* For absolutely positioning the icons */
            margin-bottom: 30px;
        }

.form-group label {
            position: absolute;
            top: 12px;
            left: 15px;
            color: rgba(255, 255, 255, 0.7);
            pointer-events: none; /* Allows clicking through the label */
            transition: 0.3s ease;
            font-size: 0.9em;
        }

input[type="email"],
        input[type="password"] {
            width: 100%;
            padding: 12px 40px 12px 15px;  /* Space for icons on the left */
            border: none;
            border-bottom: 2px solid rgba(255, 255, 255, 0.4); /* Lighter bottom border */
            background: transparent; /* Remove background */
            color: #fff;
            font-size: 16px;
            outline: none; /* Remove default outline */
            transition: border-color 0.3s ease;
        }
        input[type="email"]::placeholder,
        input[type="password"]::placeholder{
            color: rgba(255, 255, 255, 0.7);
        }

input[type="email"]:focus,
        input[type="password"]:focus {
            border-bottom-color: #fff; /* Full white on focus */
        }

/* Floating Label Effect */
        input[type="email"]:focus + label,
        input[type="password"]:focus + label,
        input[type="email"]:not(:placeholder-shown) + label,
        input[type="password"]:not(:placeholder-shown) + label

{
            transform: translateY(-20px);
            font-size: 0.8em;
            color: #fff;
        }

/* Button Styles */
        button {
            width: 100%;
            padding: 15px;
            background-color: #fff;
            color: #4e54c8; /* Complementary color */
            border: none;
            border-radius: 30px; /* Pill-shaped button */
            cursor: pointer;
            font-size: 18px;
            font-weight: bold;
            transition: all 0.3s ease;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2); /* Button shadow */
        }

button:hover {
            background-color: #4e54c8;
            color:#fff;
            transform: translateY(-3px); /* Slight lift on hover */
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3); /* Increased shadow on hover */
        }

/* Forgot Password Link */
        .forgot-password {
            text-align: center;
            margin-top: 20px;
        }

.forgot-password a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            font-size: 0.9em;
            transition: color 0.3s ease;
        }

.forgot-password a:hover {
            color: #fff;
            text-decoration: underline;
        }
        /* Responsive adjustments */
        @media (max-width: 768px) {
            .container {
                flex-direction: column;  /* Stack elements vertically on smaller screens */
                width: 90%;
                min-height: auto; /* Allow height to adjust to content */
            }

.form-container,
            .image-container{
                width: 100%; /* Full width on smaller screens */
             }
                .image-container{
                  display: none;
                }
            }

</style>
</head>
<body>
    <div class="container">
        <div class="form-container">
            <h2>Sign In</h2>
            <form>
                <div class="form-group">
                    <input type="email" id="email" name="email" required placeholder=" ">
                    <label for="email">Email</label>

</div>
                <div class="form-group">
                    <input type="password" id="password" name="password" required placeholder=" ">
                    <label for="password">Password</label>

</div>
                <button type="submit">Sign In</button>
                <div class="forgot-password">
                    <a href="#">Forgot Password?</a>
                </div>
            </form>
        </div>
        <div class="image-container">
        </div>
    </div>
</body>
</html>

CSS