window.addEventListener('scroll', () => {
  const header = document.querySelector('.header-inner.inner.bg-white.da-bgm');
  if (window.scrollY > 50) {
    header.classList.add('scrolled');
  } else {
    header.classList.remove('scrolled');
  }
});
const topbar = document.createElement('div');
topbar.id = 'custom-topbar';
topbar.innerHTML = `
  <style>
    #custom-topbar {
      position: absolute !important;
      top: 0 !important;
      left: 0 !important;
      right: 0 !important;
      width: 100% !important;
      height: 2px !important;
      background: linear-gradient(90deg, #570100, #B80000, #ff0000, #B80000, #570100) !important;
      background-size: 200% 100% !important;
      animation: topbar-slide 3s linear infinite !important;
      z-index: 2147483647 !important;
      box-shadow: 
        0 0 4px 1px #ff0000,
        0 0 10px 3px #B80000,
        0 0 20px 6px #570100 !important;
      transform: translateZ(0) !important;
    }

    @keyframes topbar-slide {
      0%   { background-position: 0% 0%; }
      100% { background-position: 200% 0%; }
    }
  </style>
`;
document.documentElement.prepend(topbar);