/* 全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* 登录容器 */
.login-container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

.login-box {
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  padding: 30px;
  text-align: center;
  animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 标题 */
h2 {
  color: #333;
  margin-bottom: 20px;
  font-size: 24px;
}

/* 输入框组 */
.input-group {
  margin-bottom: 20px;
  text-align: left;
}

.input-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  color: #555;
}

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

.input-group input:focus {
  border-color: #2575fc;
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 117, 252, 0.2);
}

/* 按钮 */
button {
  width: 100%;
  padding: 12px;
  background: linear-gradient(to right, #2575fc, #6a11cb);
  border: none;
  border-radius: 8px;
  color: white;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s, transform 0.2s;
}

button:hover {
  background: linear-gradient(to right, #1c6ae4, #580dc1);
  transform: translateY(-2px);
}

button:active {
  transform: translateY(0);
}

/* 注册链接 */
.register-link {
  margin-top: 20px;
  font-size: 14px;
  color: #777;
}

.register-link a {
  color: #2575fc;
  text-decoration: none;
  font-weight: 500;
}

.register-link a:hover {
  text-decoration: underline;
}