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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>Login</title>
    <style>
        :root {
            --primary-color: #4361ee;
            --primary-hover: #3a56d4;
            --error-color: #ef476f;
            --text-color: #2b2d42;
            --text-light: #8d99ae;
            --bg-color: #f8f9fa;
            --card-bg: #ffffff;
            --border-radius: 8px;
            --box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }

* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }

body {
            background-color: var(--bg-color);
            background-image: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }

.login-container {
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            width: 100%;
            max-width: 420px;
            padding: 40px;
            position: relative;
            overflow: hidden;
        }

.login-container::before {
            content: "";
            position: absolute;
            top: -50px;
            left: -50px;
            width: 150px;
            height: 150px;
            background-color: rgba(67, 97, 238, 0.1);
            border-radius: 50%;
            z-index: 0;
        }

.login-container::after {
            content: "";
            position: absolute;
            bottom: -50px;
            right: -50px;
            width: 120px;
            height: 120px;
            background-color: rgba(67, 97, 238, 0.05);
            border-radius: 50%;
            z-index: 0;
        }

.login-header {
            text-align: center;
            margin-bottom: 35px;
            position: relative;
            z-index: 1;
        }

.login-header h1 {
            color: var(--text-color);
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
        }

.login-header p {
            color: var(--text-light);
            font-size: 15px;
        }

.form-group {
            margin-bottom: 24px;
            position: relative;
            z-index: 1;
        }

.form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--text-color);
            font-size: 15px;
        }

.input-group {
            position: relative;
        }

.input-icon {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-light);
            font-size: 18px;
        }

.form-group input {
            width: 100%;
            padding: 14px 15px 14px 40px;
            border: 1px solid #e1e5ee;
            border-radius: var(--border-radius);
            font-size: 15px;
            transition: var(--transition);
            background-color: #f9fafc;
        }

.form-group input:focus {
            border-color: var(--primary-color);
            outline: none;
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
            background-color: white;
        }

.form-group input.error {
            border-color: var(--error-color);
            background-color: #fff8f8;
        }

.error-message {
            color: var(--error-color);
            font-size: 13px;
            margin-top: 6px;
            display: none;
        }

.remember-forgot {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
            position: relative;
            z-index: 1;
        }

.remember-me {
            display: flex;
            align-items: center;
        }

.remember-me input {
            margin-right: 8px;
            accent-color: var(--primary-color);
        }

.remember-me label {
            color: var(--text-light);
            font-size: 14px;
        }

.forgot-password {
            color: var(--primary-color);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: var(--transition);
        }

.forgot-password:hover {
            color: var(--primary-hover);
            text-decoration: underline;
        }

.login-button {
            width: 100%;
            padding: 14px;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            position: relative;
            z-index: 1;
            overflow: hidden;
        }

.login-button:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(67, 97, 238, 0.3);
        }

.login-button:active {
            transform: translateY(0);
        }

.signup-link {
            text-align: center;
            margin-top: 25px;
            font-size: 14px;
            color: var(--text-light);
            position: relative;
            z-index: 1;
        }

.signup-link a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
        }

.signup-link a:hover {
            color: var(--primary-hover);
            text-decoration: underline;
        }

.social-login {
            margin-top: 30px;
            position: relative;
            z-index: 1;
        }

.social-login-text {
            text-align: center;
            position: relative;
            margin-bottom: 20px;
        }

.social-login-text span {
            background-color: white;
            padding: 0 15px;
            color: var(--text-light);
            font-size: 14px;
            position: relative;
            z-index: 2;
        }

.social-login-text::before {
            content: "";
            position: absolute;
            top: 50%;
            left: 0;
            right: 0;
            height: 1px;
            background-color: #e1e5ee;
            z-index: 1;
        }

.social-buttons {
            display: flex;
            justify-content: center;
            gap: 15px;
        }

.social-button {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: #f9fafc;
            border: 1px solid #e1e5ee;
            cursor: pointer;
            transition: var(--transition);
        }

.social-button:hover {
            background-color: white;
            transform: translateY(-3px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

/* Responsive adjustments */
        @media (max-width: 480px) {
            .login-container {
                padding: 30px 20px;
                max-width: 100%;
            }
            
            .social-buttons {
                gap: 10px;
            }
            
            .social-button {
                width: 45px;
                height: 45px;
            }
        }
    </style>
</head>
<body>
    <div class="login-container">
        <div class="login-header">
            <h1>Welcome Back</h1>
            <p>Enter your credentials to access your account</p>
        </div>
        <form id="login-form">
            <div class="form-group">
                <label for="email">Email Address</label>
                <div class="input-group">
                    <span class="input-icon"></span>
                    <input type="email" id="email" name="email" placeholder="name@example.com" required>
                </div>
                <div class="error-message" id="email-error">Please enter a valid email address</div>
            </div>
            <div class="form-group">
                <label for="password">Password</label>
                <div class="input-group">
                    <span class="input-icon"></span>
                    <input type="password" id="password" name="password" placeholder="Enter your password" required>
                </div>
                <div class="error-message" id="password-error">Password must be at least 6 characters</div>
            </div>
            <div class="remember-forgot">
                <div class="remember-me">
                    <input type="checkbox" id="remember" name="remember">
                    <label for="remember">Remember me</label>
                </div>
                <a href="#" class="forgot-password">Forgot Password?</a>
            </div>
            <button type="submit" class="login-button">Sign In</button>
            <div class="signup-link">
                Don't have an account? <a href="#">Create account</a>
            </div>
            <div class="social-login">
                <div class="social-login-text">
                    <span>Or continue with</span>
                </div>
                <div class="social-buttons">
                    <div class="social-button">G</div>
                    <div class="social-button">f</div>
                    <div class="social-button">in</div>
                </div>
            </div>
        </form>
    </div>

CSS