/* 自定义样式 */
html { scroll-behavior: smooth; }

#particles { z-index: 0; }
header, section, footer { position: relative; z-index: 1; }
.hero-fade { opacity: 0; transform: translateY(30px); }

button:disabled { cursor: not-allowed; }

/* 移动端 */
@media (max-width: 640px) {
  #domain-name { font-size: 2.75rem; word-break: break-all; }
  #snake { width: 280px; height: 280px; }
}