Function themeToggleButton

public/js/dragAndDrop.js:70–77

(btn)

}

function themeToggleButton(btn) {
  if (!btn) return;
  const dark = document.body.classList.contains('dark-mode');
  btn.style.background = dark ? '#2c2c2c' : '#fff';
  btn.style.border = dark ? '1px solid #555' : '1px solid #ccc';
  btn.style.boxShadow = dark ? '0 2px 6px rgba(0,0,0,.35)' : '0 2px 6px rgba(0,0,0,.15)';
  btn.style.color = dark ? '#e0e0e0' : '#222';
}

function animateVerticalSlide(card) {
  card.style.transform = 'translateY(30px)';