* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  overflow: hidden;
}

#icon {
  width: 500px;
  height: 500px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
}

/* 响应式适配 */
@media (max-width: 768px) {
  #icon {
    width: 90vw;
    height: 90vw;
    max-width: 400px;
    max-height: 400px;
  }
}

@media (max-width: 480px) {
  #icon {
    width: 95vw;
    height: 95vw;
    max-width: 300px;
    max-height: 300px;
  }
}