body {
  margin: 0;
  font-family: 'Roboto', sans-serif;
  color: #ffffff;
  background: linear-gradient(135deg, #121212, #1a0033, #0d0026);
  line-height: 1.6;
  overflow-x: hidden;
}

header {
  position: relative;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  background: url("https://images.gptkong.com/demo/sample1.png") no-repeat center/cover, linear-gradient(135deg, #00ff99, #ff00ff);
  color: #fff;
  overflow: hidden;
}

header h1 {
  font-size: 3rem;
  font-weight: bold;
  text-shadow: 0 4px 6px rgba(0, 0, 0, 0.5);
  animation: fadeIn 2s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(0, 0, 0, 0.8);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 20px;
}

nav a {
  color: #00ff99;
  text-decoration: none;
  margin: 0 15px;
  font-size: 1rem;
  transition: color 0.3s ease;
}

nav a:hover {
  color: #ff00ff;
}

.progress-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 5px;
  width: 0%;
  background: linear-gradient(to right, #00ff99, #ff00ff);
  animation: progress 5s linear infinite;
}

@keyframes progress {
  0% { width: 0%; }
  100% { width: 100%; }
}

section {
  padding: 60px 20px;
  position: relative;
  overflow: hidden;
}

section:nth-child(even) {
  background: linear-gradient(135deg, #1a0033, #0d0026);
}

section h2 {
  font-size: 2.5rem;
  color: #00ff99;
  margin-bottom: 20px;
  text-align: center;
}

section p {
  font-size: 1rem;
  margin-bottom: 20px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.grid-item {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 20px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.grid-item:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.3);
}

.grid-item img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  margin-bottom: 15px;
}

button {
  background-color: #00ff99;
  color: #ffffff;
  border: none;
  padding: 10px 20px;
  font-size: 1rem;
  border-radius: 5px;
  cursor: pointer;
  transition: transform 0.3s ease, background-color 0.3s ease;
}

button:hover {
  transform: scale(1.1);
  background-color: #ff00ff;
}

pre {
  background: rgba(0, 0, 0, 0.7);
  padding: 20px;
  border-radius: 10px;
  overflow-x: auto;
  margin: 20px 0;
}

code {
  color: #00ff99;
  font-size: 0.9rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  background: rgba(0, 0, 0, 0.5);
  border-radius: 10px;
  overflow: hidden;
}

th, td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid #00ff99;
}

th {
  background: #00ff99;
  color: #000;
}

@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }

  section h2 {
    font-size: 2rem;
  }

  .grid-container {
    grid-template-columns: 1fr;
  }
}