body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background-color: #f9fafb;
  color: #333;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  position: relative;
  background-color: #ffffff;
  padding: 4rem 1rem 2rem;
  text-align: center;
  border-bottom: 1px solid #e0e0e0;
  overflow: hidden;
}

.puzzle-bg {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 600px;
  background-image: url('puzzle-bg.png');
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
  opacity: 0.50;
  transform: translate(-50%, -50%);
  z-index: 0;
}

.header-content {
  position: relative;
  z-index: 1;
}

header h1 {
  margin: 0;
  font-size: 2.5rem;
}

header h2 {
  font-weight: 400;
  color: #666;
  font-size: 1.25rem;
  margin-top: 0.5rem;
}

main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem;
}

.card {
  background-color: #fff;
  max-width: 800px;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  text-align: center;
}

.card p {
  font-size: 1rem;
  line-height: 1.6;
  margin: 1rem 0;
}

a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

footer {
  text-align: center;
  font-size: 0.85rem;
  color: #888;
  padding: 1rem;
  border-top: 1px solid #e0e0e0;
  background-color: #fff;
}

@media (max-width: 600px) {
  .card {
    padding: 1.5rem 1rem;
  }

  header h1 {
    font-size: 2rem;
  }

  header h2 {
    font-size: 1rem;
  }

  .puzzle-bg {
    width: 400px;
    height: 400px;
  }
}