* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background: #fff;
  padding: 1rem 0;
  border-bottom: 1px solid #ddd;
}

header img {
  display: block;
  max-width: 200px;
  height: auto;
}

main {
  padding: 2rem 0;
  flex: 1;
}

.site-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.link-card {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  transition: box-shadow 0.3s;
}

.link-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.link-card h2 {
  color: #d32f2f;
  margin-bottom: 1rem;
}

.link-card p {
  margin-bottom: 1.5rem;
  color: #666;
}

.btn {
  display: inline-block;
  background: #d32f2f;
  color: white;
  padding: 12px 24px;
  text-decoration: none;
  border-radius: 4px;
  transition: background 0.3s;
}

.btn:hover {
  background: #b71c1c;
}

footer {
  background: #f5f5f5;
  color: #666;
  text-align: center;
  padding: 0.5rem 0;
  position: sticky;
  bottom: 0;
  z-index: 100;
}

footer p {
  font-size: 0.75rem;
}

@media (max-width: 768px) {
  main {
    padding: 1rem 0;
  }

  .container {
    padding: 0 15px;
  }

  .link-card {
    padding: 1.5rem;
  }

  .site-links {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .btn {
    display: block;
    width: 100%;
  }
}

.error-content {
  text-align: center;
  padding: 4rem 2rem;
}

.error-content h1 {
  font-size: 6rem;
  color: #d32f2f;
  margin-bottom: 1rem;
}

.error-content h2 {
  font-size: 2rem;
  color: #333;
  margin-bottom: 1rem;
}

.error-content p {
  color: #666;
  margin-bottom: 2rem;
}

@media (max-width: 768px) {
  .error-content {
    padding: 2rem 1rem;
  }

  .error-content h1 {
    font-size: 4rem;
  }

  .error-content h2 {
    font-size: 1.5rem;
  }
}