:root {
            --primary-color: #4c1d95;
            --secondary-color: #ffffff;
            --text-color: #333;
            --border-color: #ccc;
            --background-color: #f5f5f5;
            --error:#721c24;
        }

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

        body {
            font-family: Arial, sans-serif;
            background-color: var(--primary-color);
            min-height: 100vh;
            padding-top: 70px;
        }

       

        .main-container {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: calc(100vh - 70px);
            padding: 20px;
        }

        .login-container {
            background-color: var(--secondary-color);
            padding: 30px;
            border-radius: 12px;
            width: 100%;
            max-width: 420px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
        }

        .logo {
            text-align: center;
            margin-bottom: 25px;
        }

        .logo img {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            object-fit: cover;
        }

        h2 {
            text-align: center;
            color: var(--text-color);
            margin-bottom: 25px;
            font-size: 28px;
            font-weight: 600;
        }

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

        label {
            display: block;
            color: var(--text-color);
            margin-bottom: 8px;
            font-weight: 500;
            font-size: 14px;
        }

        input {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s, box-shadow 0.3s;
        }

        input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(76, 29, 149, 0.1);
        }

        button {
            width: 100%;
            padding: 14px;
            background-color: var(--primary-color);
            color: var(--secondary-color);
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            transition: background-color 0.3s, transform 0.2s;
            margin-top: 10px;
        }

        button:hover {
            background-color: var(--primary-color);
            transform: translateY(-1px);
        }

        button:active {
            transform: translateY(0);
        }

        .login-link {
            text-align: center;
            margin-top: 20px;
            color: #666;
            font-size: 14px;
        }

        .login-link a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
        }

        .login-link a:hover {
            text-decoration: underline;
        }

        .message {
            text-align: center;
            padding: 12px;
            margin-bottom: 20px;
            border-radius: 8px;
            font-weight: 500;
        }

        .success {
            background-color: var(--background-color);
            color: #155724;
            border: 1px solid var(--border-color);
        }

        .error {
            background-color: var(--background-color);
            color: var(--error);
            border: 1px solid #f5c6cb;
        }

        @media (max-width: 480px) {
            .top-nav {
                padding: 12px 15px;
            }

            .nav-brand {
                font-size: 20px;
            }

            .back-btn {
                font-size: 14px;
                padding: 6px 10px;
            }

            .main-container {
                padding: 15px;
            }

            .login-container {
                padding: 25px 20px;
                margin: 10px;
            }

            h2 {
                font-size: 24px;
                margin-bottom: 20px;
            }

            .logo img {
                width: 70px;
                height: 70px;
            }

            input {
                padding: 12px;
                font-size: 16px;
            }

            button {
                padding: 12px;
                font-size: 16px;
            }
        }

        @media (max-width: 360px) {
            .login-container {
                padding: 20px 15px;
            }

            .nav-brand {
                font-size: 18px;
            }

            h2 {
                font-size: 22px;
            }
        }

        @media (min-width: 481px) and (max-width: 768px) {
            .main-container {
                padding: 30px;
            }

            .login-container {
                max-width: 480px;
                padding: 35px;
            }
        }

        @media (min-width: 769px) {
            .main-container {
                padding: 40px;
            }

            .login-container {
                max-width: 450px;
                padding: 40px;
            }

            .nav-brand {
                font-size: 26px;
            }
        }

        @media (min-width: 1200px) {
            .login-container {
                max-width: 500px;
                padding: 45px;
            }
        }

        @media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
            .logo img {
                image-rendering: -webkit-optimize-contrast;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            * {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }

        .back-btn:focus {
            outline: 2px solid var(--primary-color);
            outline-offset: 2px;
        }

        button:focus {
            outline: 2px solid var(--secondary-color);
            outline-offset: 2px;
        }