domUtils.ts

// DOM utility functions
export function isElementInViewport(el: Element): boolean {
  const rect = el.getBoundingClientRect();
  return rect.top >= 0 && rect.left >= 0 && rect.bottom <= window.innerHeight && rect.right <= window.innerWidth;
}
export function copyToClipboard(text: string): Promise<void> {
  if (navigator.clipboard) return navigator.clipboard.writeText(text);
  const textarea = document.createElement('textarea');
  textarea.value = text;
  textarea.style.position = 'fixed';
  textarea.style.opacity = '0';
  document.body.appendChild(textarea);
  textarea.select();
  document.execCommand('copy');
  document.body.removeChild(textarea);
  return Promise.resolve();
}
export function getScrollPercentage(): number {
  const h = document.documentElement;
  const b = document.body;
  const scrollTop = h.scrollTop || b.scrollTop;
  const scrollHeight = (h.scrollHeight || b.scrollHeight) - h.clientHeight;
  return scrollHeight > 0 ? Math.round((scrollTop / scrollHeight) * 100) : 0;
}