:root {
            --background: #f8f9fa;
            --primary: #0d6efd;
            --secondary: #6c757d;
            --success: #198754;
            --danger: #dc3545;
            --text: #212529;
            --card-bg: #ffffff;
            --border-color: #dee2e6;
        }

        .dark-mode {
            --background: #212529;
            --primary: #0d6efd;
            --secondary: #6c757d;
            --success: #198754;
            --danger: #dc3545;
            --text: #f8f9fa;
            --card-bg: #343a40;
            --border-color: #495057;
        }

        body {
            background-color: var(--background);
            color: var(--text);
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            min-height: 100vh;
            transition: background-color 0.3s ease;
        }

        .login-container {
            max-width: 400px;
            background-color: var(--card-bg);
            border-radius: 0.5rem;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            transition: background-color 0.3s ease, box-shadow 0.3s ease;
        }

        .login-container.dark {
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
        }

        .form-input {
            background-color: var(--background);
            color: var(--text);
            border: 1px solid var(--border-color);
            border-radius: 0.25rem;
            padding: 0.65rem 2.5rem;
            width: 100%;
            transition: all 0.3s ease;
        }

        .form-input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
            outline: none;
        }

        .btn-primary {
            background-color: var(--primary);
            color: white;
            transition: all 0.3s ease;
        }

        .btn-primary:hover {
            background-color: #0b5ed7;
            transform: translateY(-1px);
        }

        .toggle-password {
            cursor: pointer;
            color: var(--secondary);
        }

        .logo-container {
            height: 60px;
            width: 60px;
            background-color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem auto;
        }

        .link {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .link:hover {
            color: #0b5ed7;
            text-decoration: underline;
        }

        .form-checkbox {
            width: 1rem;
            height: 1rem;
            border: 1px solid var(--border-color);
            border-radius: 0.25rem;
            margin-right: 0.5rem;
            cursor: pointer;
        }

        .theme-toggle {
            position: absolute;
            top: 1rem;
            right: 1rem;
            background: transparent;
            border: none;
            color: var(--text);
            cursor: pointer;
            font-size: 1.25rem;
            padding: 0.5rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background-color 0.3s ease;
        }

        .theme-toggle:hover {
            background-color: rgba(0, 0, 0, 0.1);
        }

        .dark-mode .theme-toggle:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .login-container {
            animation: fadeIn 0.5s ease-in-out;
        }