html, body {
  background: #fff;
  color: #000;
  transition: background 0.3s, color 0.3s;
}
body.dark {
  background: #000;
  color: #fff;
}
body.dark a { color: #E6B800; }
body.dark input, body.dark textarea {
  background: #222;
  color: #fff;
  border: 1px solid #E6B800;
}
input, textarea {
  background: #fff;
  border: 1px solid #E6B800;
  color: #000;
  box-shadow: 0 0 6px rgba(0,0,0,0.1);
  border-radius: 8px;
  padding: 0.8rem;
  width: 100%;
}
.theme-toggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #E6B800;
  border: none;
  color: #000;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 12px rgba(230,184,0,0.4);
  font-size: 22px;
  transition: transform 0.3s ease, background 0.3s ease;
  z-index: 9999;
}
.theme-toggle:hover {
  background: #E69500;
  transform: scale(1.1);
}