/* Estilos generales */
body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f4f9;
    text-align: center;
    margin: 0;
    padding: 0;
}

/* Contenedor principal */
.container {
    max-width: 500px;
    margin: 50px auto;
    padding: 20px;
    background: #ffffff;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* Encabezados */
h2 {
    color: #333;
    margin-bottom: 10px;
}

h3 {
    color: #d9534f;
    margin-top: 15px;
}

h4 {
    color: #5bc0de;
    margin-top: 15px;
}

/* Expresión algebraica */
#expression {
    font-size: 22px;
    font-weight: bold;
    color: #2c3e50;
    background: #ecf0f1;
    padding: 10px;
    border-radius: 5px;
    display: inline-block;
    margin-bottom: 15px;
}

/* Área de respuesta */
textarea {
    width: calc(100% - 20px);
    height: 60px;
    padding: 10px;
    font-size: 18px;
    border: 2px solid #3498db;
    border-radius: 5px;
    outline: none;
    resize: none;
    margin-bottom: 10px;
}

textarea:focus {
    border-color: #2980b9;
}

/* Botón */
button {
    background-color: #27ae60;
    color: white;
    font-size: 18px;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background-color: #219150;
}

/* Resultado y solución */
#result {
    font-size: 20px;
    font-weight: bold;
}

#solution {
    font-size: 18px;
    color: #333;
    background: #dff0d8;
    padding: 10px;
    border-radius: 5px;
    display: inline-block;
    margin-top: 10px;
}
/* Botones */
button {
    background-color: #27ae60;
    color: white;
    font-size: 18px;
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
    margin: 5px;
}

button:hover {
    background-color: #219150;
}

button:nth-child(2) { /* Botón de exponentes */
    background-color: #f39c12;
}

button:nth-child(2):hover {
    background-color: #e67e22;
}