Rhye theme: different header color theme in blog posts

<?php

// Main header theme: dark | light
add_filter( 'theme_mod_header_main_theme', function( $default ) {
  if ( is_singular( 'post' ) ) {
    $default = 'light';
  }

  return $default;
});

// Main header logo: primary | secondary
add_filter( 'theme_mod_header_main_logo', function( $default ) {
  if ( is_singular( 'post' ) ) {
    $default = 'secondary';
  }

  return $default;
});