<div class="error-page">
  <div class="error-container">
    <h1 class="error-title">404</h1>
    <h2 class="error-subtitle">Oops! Page Not Found</h2>
    <p class="error-text">Sorry, the page you are looking for does not exist or has been moved.</p>
    <div class="error-actions">
      <a href="/" class="btn btn-primary">Back to Home</a>
      <a href="/contact" class="btn btn-outline-primary">Contact Support</a>
    </div>
  </div>
</div>

<style>
.error-page {
  min-height: calc(100vh - 200px); /* Trừ đi header và footer */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.error-container {
  text-align: center;
  max-width: 600px;
  padding: 40px 20px;
}

.error-title {
  font-size: 120px;
  color: linear-gradient(90deg, #067f3f, #056633, #044e27);
        background: -webkit-linear-gradient(90deg, #067f3f, #056633, #044e27);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
  margin: 0;
  line-height: 1;
  font-weight: 700;
}

.error-subtitle {
  font-size: 28px;
  color: #333;
  margin: 20px 0;
}

.error-text {
  font-size: 18px;
  color: #666;
  margin-bottom: 30px;
}

.error-actions {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.btn-outline-primary:hover {
  border-color: white;
}

@media (max-width: 768px) {
  .error-title {
    font-size: 80px;
  }
  
  .error-subtitle {
    font-size: 24px;
  }
  
  .error-text {
    font-size: 16px;
  }
  
  .error-actions {
    flex-direction: column;
    gap: 10px;
  }
  
  .error-actions .btn {
    width: 100%;
  }
}
</style> 