body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: rgba(0, 0, 0, 0.85);
  /* background: url("img/4874e71e61e51f7d5103ad26e47f78b5.jpg") no-repeat center
    center/cover;
  opacity: 0.98; */
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.3);
  display: flex;
  justify-content: center;
  align-items: center;
}

.content {
  text-align: center;
  color: #fff;
  padding: 20px;
}

.content h1 {
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.content p {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 30px;
}

.btn {
  display: inline-block;
  padding: 5px 14px;
  font-size: 1rem;
  margin-top: 10px;
  color: #fff;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 500;
  transition: background 0.3s ease, transform 0.3s ease;
}

.btn:hover {
  background-color: #333;
  transform: scale(1.08);
}

.fade-in-delay-1 {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  margin-right: 10px;
}

.nickname:hover {
  color: orange;
}

/* 淡入动画 */
/* .fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 1s forwards;
} */

.delay-1 {
  animation-delay: 0.5s;
}
.delay-2 {
  font-family: Arial, Helvetica, sans-serif;
  animation-delay: 1s;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.code:hover {
  color: orange;
}

/* .fade-in:hover {
  color: orange;
} */

/* 淡入动画 */
.code {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 1.2s forwards;
}

/* 淡入动画 */
.nickname {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 1.5s forwards;
}