body {
  margin: 0;
  background: linear-gradient(120deg, #f4f8fb 0%, #e9eef5 100%);
  font-family: "Segoe UI", "Noto Sans", sans-serif;
}

.center-card {
  max-width: 420px;
  margin: 12vh auto;
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(19, 36, 61, 0.12);
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #113049;
}

.content {
  max-width: 1200px;
  width: calc(100% - 32px);
  margin: 16px auto;
  padding: 16px;
  background: rgba(255, 255, 255, 0.92);
  border-radius: 12px;
}