:root {
            --primary-color: #0078d4;
            --secondary-color: #2b88d8;
            --dark-color: #106ebe;
            --light-color: #deecf9;
            --success-color: #107c10;
            --warning-color: #ffb900;
            --danger-color: #d13438;
            --gray-color: #505050;
            --light-gray: #f3f2f1;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f5f5f5;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
        }

        a {
            text-decoration: none;
            color: var(--primary-color);
        }

        .login-container {
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
            width: 100%;
            max-width: 450px;
            padding: 40px;
            text-align: center;
        }

        .logo {
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: bold;
            color: var(--primary-color);
            margin-bottom: 30px;
        }

        .logo img {
            height: 140px;
            margin-right: 10px;
        }

        h1 {
            font-size: 28px;
            margin-bottom: 20px;
            color: var(--gray-color);
        }

        p {
            color: var(--gray-color);
            margin-bottom: 30px;
        }

        .login-form {
            text-align: left;
        }

        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--gray-color);
        }

        input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
        }

        input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 2px rgba(0, 120, 212, 0.2);
        }

        .remember-me {
            display: flex;
            align-items: center;
            margin: 20px 0;
        }

        .remember-me input {
            width: auto;
            margin-right: 10px;
        }

        .btn {
            display: inline-block;
            padding: 12px 20px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 600;
            transition: background-color 0.3s, transform 0.2s;
            font-size: 16px;
            width: 100%;
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: white;
        }

        .btn-primary:hover {
            background-color: var(--dark-color);
            transform: translateY(-2px);
        }

        .divider {
            display: flex;
            align-items: center;
            margin: 30px 0;
            color: #888;
        }

        .divider::before, .divider::after {
            content: "";
            flex: 1;
            height: 1px;
            background-color: #ddd;
        }

        .divider::before {
            margin-right: 15px;
        }

        .divider::after {
            margin-left: 15px;
        }

        .footer-links {
            margin-top: 30px;
            font-size: 14px;
        }

        .footer-links a {
            margin: 0 10px;
            color: #888;
        }

        .footer-links a:hover {
            color: var(--primary-color);
        }

        .alert {
            display: none;
            margin-top: 10px;
            padding: 10px;
            border-radius: 4px;
            font-size: 14px;
        }

        .alert.success {
            color: green;
            border: 1px solid green;
            background-color: #eaffea;
        }

        .alert.error {
            color: red;
            border: 1px solid red;
            background-color: #ffeaea;
        }

        @media (max-width: 500px) {
            .login-container {
                border-radius: 0;
                box-shadow: none;
                padding: 20px;
            }

            .social-login {
                flex-direction: column;
                gap: 15px;
            }

            .social-btn {
                margin: 0;
            }
        }