body {
  font-family: Arial, sans-serif;
  text-align: center;
  margin: 0;
  padding: 0;
  height: 100vh;
  background: linear-gradient(135deg, #a5d6a7, #41b647);
  background-size: cover;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

header {
  background-color: rgba(212, 56, 103, 0.466);
  color: white;
  padding: 1.5rem 2rem;
  width: 100%;
  max-width: 800px;
  box-sizing: border-box;
  border-radius: 8px;
}

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

nav {
  margin: 2rem 0;
  width: 100%;
  max-width: 1200px;
  padding: 0 1rem;
  box-sizing: border-box;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

nav a {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.2rem 0.8rem;
  text-decoration: none;
  color: #fff;
  background: linear-gradient(145deg, #2e7d32, #1b5e20);
  border-radius: 15px;
  font-size: 1rem;
  text-align: center;
  line-height: 1.4;
  transition: all 0.3s ease;
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.1);
  min-height: 90px;
}

nav a i {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: #a5d6a7;
}

nav a:hover {
  background: linear-gradient(145deg, #1b5e20, #0d4c12);
  box-shadow: 0 12px 25px rgba(0, 0, 0, 0.3);
  transform: translateY(-5px) scale(1.02);
  border-color: rgba(255, 255, 255, 0.3);
}

nav a:hover i {
  color: #c8e6c9;
  transform: scale(1.1);
}

hr {
  grid-column: 1 / -1;
  width: 100%;
  border: 0;
  height: 3px;
  background: linear-gradient(to right, #4f46e5, #14b8a6, #f59e0b);
  margin: 1rem 0;
  border-radius: 2px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Media Queries สำหรับหน้าจอมือถือ */
@media (max-width: 768px) {
  header {
    padding: 1rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  nav {
    margin: 1.5rem 0;
    padding: 0 0.5rem;
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  nav a {
    padding: 1rem 0.8rem;
    font-size: 0.9rem;
    min-height: 80px;
  }
  
  nav a i {
    font-size: 1.8rem;
    margin-bottom: 0.4rem;
  }
}

@media (max-width: 480px) {
  nav a {
    padding: 0.8rem 0.6rem;
    font-size: 0.85rem;
  }
  
  nav a i {
    font-size: 1.6rem;
  }
}