/* 全局基础样式 */
body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: linear-gradient(135deg, #1e3c72, #2a5298);
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  transition: background 0.5s ease, color 0.5s ease;
}

/* 容器样式 */
.container {
  text-align: center;
  padding: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.3);
  max-width: 600px;
  width: 90%;
}

/* 标题样式 */
h1 {
  font-size: 2.5em;
  margin-bottom: 30px;
}

/* 按钮组样式 */
.button-group {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-top: 20px;
}

/* 按钮样式 */
.btn {
  text-decoration: none;
  padding: 15px 25px;
  background-color: #ffffff22;
  color: #fff;
  border: 2px solid #fff;
  border-radius: 10px;
  font-size: 1.2em;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn:hover {
  background-color: #fff;
  color: #2a5298;
  transform: scale(1.05);
}

/* 表单输入框样式 */
input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  padding: 12px;
  margin: 10px 0;
  border: none;
  border-radius: 8px;
  font-size: 1em;
}

/* 用户卡片样式（管理员后台） */
.user-card {
  background-color: #ffffff22;
  padding: 15px;
  margin: 10px 0;
  border-radius: 10px;
  text-align: left;
}

/* 搜索框样式 */
#searchInput {
  width: 100%;
  padding: 12px;
  margin-bottom: 20px;
  border-radius: 8px;
  border: none;
  font-size: 1em;
}

/* 黑暗模式样式 */
body.dark-mode {
  background: #121212;
  color: #eee;
}

body.dark-mode .container {
  background: rgba(255, 255, 255, 0.05);
}

body.dark-mode .btn {
  background-color: #333;
  border-color: #eee;
  color: #eee;
}

body.dark-mode .btn:hover {
  background-color: #eee;
  color: #121212;
}

body.dark-mode input,
body.dark-mode #searchInput {
  background-color: #222;
  color: #eee;
}