html {
  overflow-y: scroll; /* 始终显示垂直滚动条 */
}

h1,
h2,
h3 {
  text-align: center; /* 让标题文字水平居中 */
  margin-top: 0; /* 移除顶部的外边距，防止外边距折叠 */
}

body {
  min-height: 100vh;
  margin: 0;
  background-color: #f0f2f5; /* 添加一个柔和的背景色 */
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; /* 使用更现代的字体 */
  transition: background-color 0.3s;
  display: flex;
  justify-content: center;
  align-items: center;
}

.plane-switch {
  position: fixed; /* 修改为 fixed 定位，使其相对于浏览器窗口 */
  top: 20px; /* 距离顶部 20px */
  right: 20px; /* 距离右侧 20px */
  --dot: #fff;
  --street: #6b6d76;
  --street-line: #a8aab4;
  --street-line-mid: #c0c2c8;
  --sky-1: #60a7fa;
  --sky-2: #2f8efc;
  --light-1: rgba(255, 233, 0, 1);
  --light-2: rgba(255, 233, 0, 0.3);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.plane-switch input {
  display: none;
}

.plane-switch input + div {
  -webkit-mask-image: -webkit-radial-gradient(white, black);
  position: relative;
  overflow: hidden;
  width: 50px;
  height: 25px;
  padding: 1px;
  border-radius: 13px;
  background: linear-gradient(
      90deg,
      var(--street) 0%,
      var(--street) 25%,
      var(--sky-1) 75%,
      var(--sky-2) 100%
    )
    left var(--p, 0%) top 0;
  background-position-x: var(--p, 0%);
  background-size: 400% auto;
  transition: background-position 0.6s;
}

.plane-switch input + div:before,
.plane-switch input + div:after {
  content: "";
  display: block;
  position: absolute;
  transform: translateX(var(--s, 0));
  transition: transform 0.3s;
}

.plane-switch input + div:before {
  width: 42px;
  right: 2px;
  top: 4px;
  height: 1px;
  background: var(--street-line);
  box-shadow: 0 16px 0 0 var(--street-line);
}

.plane-switch input + div:after {
  width: 2px;
  height: 2px;
  border-radius: 50%;
  left: 23px;
  top: 1px;
  -webkit-animation: lights2 2s linear infinite;
  animation: lights2 2s linear infinite;
  box-shadow: inset 0 0 0 2px var(--light-1), 0 21px 0 var(--light-1),
    8px 0 0 var(--light-2), 8px 21px 0 var(--light-2), 16px 0 0 var(--light-2),
    16px 21px 0 var(--light-2);
}

.plane-switch input + div span {
  display: block;
  position: absolute;
}

.plane-switch input + div span.street-middle {
  top: 12px;
  left: 21px;
  width: 3px;
  height: 1px;
  transform: translateX(var(--s, 0));
  background: var(--street-line-mid);
  box-shadow: 5px 0 0 var(--street-line-mid), 10px 0 0 var(--street-line-mid),
    15px 0 0 var(--street-line-mid), 20px 0 0 var(--street-line-mid),
    25px 0 0 var(--street-line-mid);
  transition: transform 0.3s;
}

.plane-switch input + div span.cloud {
  width: 12px;
  height: 4px;
  border-radius: 2px;
  background: #fff;
  position: absolute;
  top: var(--ct, 8px);
  left: 100%;
  opacity: var(--co, 0);
  transition: opacity 0.3s;
  -webkit-animation: clouds2 2s linear infinite var(--cd, 0s);
  animation: clouds2 2s linear infinite var(--cd, 0s);
}

.plane-switch input + div span.cloud:before,
.plane-switch input + div span.cloud:after {
  content: "";
  position: absolute;
  transform: translateX(var(--cx, 0));
  border-radius: 50%;
  width: var(--cs, 5px);
  height: var(--cs, 5px);
  background: #fff;
  bottom: 1px;
  left: 1px;
}

.plane-switch input + div span.cloud:after {
  --cs: 6px;
  --cx: 4px;
}

.plane-switch input + div span.cloud.two {
  --ct: 20px;
  --cd: 1s;
  opacity: var(--co-2, 0);
}

.plane-switch input + div div {
  display: table;
  position: relative;
  z-index: 1;
  padding: 5px;
  border-radius: 50%;
  background: var(--dot);
  transform: translateX(var(--x, 0));
  transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.35, 1.2);
}

.plane-switch input + div div svg {
  width: 13px;
  height: 13px;
  display: block;
  color: var(--c, var(--street));
  transition: color 0.6s;
}

.plane-switch input:checked + div {
  --p: 100%;
  --x: 25px;
  --s: -50px;
  --c: var(--sky-2);
  --co: 0.8;
  --co-2: 0.6;
}

@keyframes lights2 {
  20%,
  30% {
    box-shadow: inset 0 0 0 2px var(--light-2), 0 21px 0 var(--light-2),
      8px 0 0 var(--light-1), 8px 21px 0 var(--light-1), 16px 0 0 var(--light-2),
      16px 21px 0 var(--light-2);
  }

  55%,
  65% {
    box-shadow: inset 0 0 0 2px var(--light-2), 0 21px 0 var(--light-2),
      8px 0 0 var(--light-2), 8px 21px 0 var(--light-2), 16px 0 0 var(--light-1),
      16px 21px 0 var(--light-1);
  }

  90%,
  100% {
    box-shadow: inset 0 0 0 2px var(--light-1), 0 21px 0 var(--light-1),
      8px 0 0 var(--light-2), 8px 21px 0 var(--light-2), 16px 0 0 var(--light-2),
      16px 21px 0 var(--light-2);
  }
}

@keyframes clouds2 {
  97% {
    transform: translateX(-72px);
    visibility: visible;
  }

  98%,
  100% {
    visibility: hidden;
  }

  99% {
    transform: translateX(-72px);
  }

  100% {
    transform: translateX(0);
  }
}

/* 登录页面的样式 */
/* 旧的登录页面样式将被替换 */

/* 用于隐藏元素的类 */
/* .hidden 类不再需要，由新的逻辑替代 */

/* 新的页面切换逻辑 */
body {
  display: flex;
  justify-content: center;
  align-items: center;
}

#main-content,
#login-container {
  display: none; /* 默认都隐藏 */
  flex-direction: column;
  align-items: center;
  width: 100%;
}

#login-container {
  background: #ffffff;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  width: 360px;
  box-sizing: border-box;
  opacity: 0;
  transform: translateY(-20px);
  transition: opacity 0.4s, transform 0.4s;
}

/* 默认状态下，显示主内容 */
body:not(.login-active) #main-content {
  display: flex;
}

/* 当 body 有 .login-active 类时，显示登录表单 */
body.login-active #login-container {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

#login-container h2 {
  text-align: center;
  margin-top: 0;
  margin-bottom: 25px;
  color: #333;
  font-size: 24px;
}

.form-group {
  width: 100%;
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: #555;
  font-weight: 600;
}

.form-group input {
  width: 100%;
  padding: 12px 15px;
  box-sizing: border-box;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input:focus {
  outline: none;
  border-color: #007bff;
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
}

#login-container button {
  width: 100%;
  padding: 12px;
  background: linear-gradient(90deg, #007bff, #0056b3);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 16px;
  font-weight: bold;
  transition: transform 0.2s, box-shadow 0.2s;
}

#login-container button:hover {
  box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
  transform: translateY(-2px);
}

.main-image {
  max-width: 50%;
  height: auto;
  margin: 20px 0;
}

/* 移除旧的 #main-content 和 #main-image 样式 */