:root {
  --main-color: #0F2027;
  --accent-color: #A6B1E1;
  --highlight-color: #37ECDB;
  --text-color: #FFFFFF;
  --bg-gradient: linear-gradient(135deg, var(--main-color), var(--accent-color));
  --box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  --font-primary: 'Roboto', sans-serif;
  --font-secondary: 'Open Sans', sans-serif;
}

body {
  margin: 0;
  font-family: var(--font-primary);
  background: var(--bg-gradient);
  color: var(--text-color);
  line-height: 1.6;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(15, 32, 39, 0.9);
  padding: 15px 20px;
  z-index: 1000;
  box-shadow: var(--box-shadow);
}

.nav-links {
  display: flex;
  justify-content: space-around;
  align-items: center;
}

.nav-link {
  color: var(--text-color);
  text-decoration: none;
  font-weight: bold;
  transition: color 0.3s ease;
}

.nav-link:hover {
  color: var(--highlight-color);
}

.hero-section {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover, var(--bg-gradient);
  background-blend-mode: overlay;
  padding: 20px;
}

.hero-section h1 {
  font-size: 3rem;
  margin-bottom: 20px;
}

.hero-section p {
  font-size: 1.2rem;
  max-width: 800px;
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  padding: 20px;
}

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

.grid-item:hover {
  transform: translateY(-5px);
}

.grid-item img {
  width: 100%;
  border-radius: 8px;
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s ease-in-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.featured-section {
  background: var(--bg-gradient);
  padding: 50px 20px;
  text-align: center;
}

.featured-section h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

.code-block {
  background: rgba(0, 0, 0, 0.7);
  color: var(--highlight-color);
  padding: 20px;
  border-radius: 8px;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
}

footer {
  text-align: center;
  padding: 20px;
  background: var(--main-color);
  margin-top: 40px;
}

@media (max-width: 768px) {
  .hero-section h1 {
    font-size: 2rem;
  }
  .hero-section p {
    font-size: 1rem;
  }
  .grid-container {
    grid-template-columns: 1fr;
  }
}