.login-bg {
  min-height: 100vh;
  background: linear-gradient(135deg, #b3cfff 0%, #e0e7ff 50%, #f4f7ff 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Segoe UI", "PingFang SC", sans-serif;
}

/* 登录卡片 */
.login-card {
  width: 400px;
  border-radius: 14px;
  padding: 28px 32px;
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 8px 40px rgba(73, 99, 148, 0.2);
  backdrop-filter: blur(8px);
  color: #334155;
}

/* 标题行 */
.login-card .title {
  text-align: center;
  margin-bottom: 22px;
}
.login-card .title h4 {
  font-weight: 600;
  color: #1e3a8a;
  margin-bottom: 6px;
}
.login-card .title small {
  color: #64748b;
}

/* 表单样式 */
.login-card .form-control {
  height: 42px;
  border: 1px solid #d0d7ea;
  border-radius: 8px;
  padding: 10px 12px;
  color: #334155;
  background-color: #f9fafb;
}
.login-card .form-control:focus {
  border-color: #3b82f6;
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* 按钮 */
.login-card .btn-primary {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  border: 0;
  height: 44px;
  border-radius: 8px;
  font-weight: 600;
}
.login-card .btn-primary:hover {
  filter: brightness(1.05);
}

/* 版权 */
.login-card .footer {
  text-align: center;
  color: #64748b;
  font-size: 12px;
  margin-top: 14px;
}