body {
  font-family: sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background: #f4f4f4;
}

.rickroll-btn {
  padding: 14px 28px;
  font-size: 18px;
  font-weight: bold;
  color: white;
  background: linear-gradient(135deg, #ff416c, #ff4b2b);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.rickroll-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(0,0,0,0.25);
}

.rickroll-btn:active {
  transform: translateY(0);
}

/* Modal overlay */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.8);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-overlay.active {
  display: flex;
}

.modal-content {
  position: relative;
  width: 90%;
  max-width: 640px;
}

.modal-content iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
  border-radius: 8px;
}

.close-btn {
  position: absolute;
  top: -40px;
  right: 0;
  background: white;
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  font-size: 18px;
  cursor: pointer;
}