* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: #f5f5f5;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }

        /* Contenedor principal */
        .login-container {
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            width: 100%;
            max-width: 400px;
            padding: 30px;
            transition: all 0.3s ease;
        }

        /* Logo */
        .logo {
            text-align: center;
            margin-bottom: 30px;
        }

        .logo img {
            max-width: 80px;
            height: auto;
        }

        .logo h1 {
            margin-top: 15px;
            color: #333;
            font-size: 1.5rem;
        }

        /* Formulario */
        .login-form .form-group {
            margin-bottom: 20px;
        }

        .login-form label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-weight: 500;
        }

        .login-form input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }

        .login-form input:focus {
            border-color: #4a90e2;
            outline: none;
            box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
        }

        /* Botón */
        .login-btn {
            width: 100%;
            padding: 12px;
            background-color: #4a90e2;
            color: white;
            border: none;
            border-radius: 5px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

        .login-btn:hover {
            background-color: #3a7bc8;
        }

        /* Enlaces adicionales */
        .additional-links {
            margin-top: 20px;
            text-align: center;
        }

        .additional-links a {
            color: #666;
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.3s ease;
        }

        .additional-links a:hover {
            color: #4a90e2;
        }

        .additional-links .divider {
            margin: 0 10px;
            color: #ccc;
        }

        /* Responsive para pantallas muy pequeñas */
        @media (max-width: 480px) {
            .login-container {
                padding: 20px;
            }

            .logo h1 {
                font-size: 1.3rem;
            }

            .login-form input {
                padding: 10px 12px;
            }

            .login-btn {
                padding: 10px;
            }
        }

        /* Efecto de carga opcional */
        .login-btn.loading {
            position: relative;
            pointer-events: none;
        }

        .login-btn.loading::after {
            content: "";
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 20px;
            height: 20px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-top-color: white;
            border-radius: 50%;
            animation: spin 0.8s linear infinite;
        }

        @keyframes spin {
            to { transform: translate(-50%, -50%) rotate(360deg); }
        }