:root {
  --primary-color: #1A1E4B;
  --secondary-color: #FFC700;
  --accent-color: #000000;
  --text-color: #FFFFFF;
  --background-gradient: linear-gradient(135deg, #1A1E4B, #000000);
  --code-bg: #282c34;
  --code-text: #61dafb;
  --transition-speed: 0.3s;
}

body {
  margin: 0;
  font-family: 'Roboto', sans-serif;
  background: var(--background-gradient);
  color: var(--text-color);
  line-height: 1.6;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  background: rgba(0, 0, 0, 0.7);
}

header h1 {
  font-size: 24px;
  font-weight: bold;
  text-transform: uppercase;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
}

nav a {
  text-decoration: none;
  color: var(--secondary-color);
  font-weight: 500;
  transition: color var(--transition-speed) ease;
}

nav a:hover {
  color: var(--text-color);
}

.hero-section {
  text-align: center;
  padding: 60px 20px;
  background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover, var(--background-gradient);
}

.hero-section h2 {
  font-size: 36px;
  margin-bottom: 20px;
}

.hero-section p {
  font-size: 18px;
  max-width: 800px;
  margin: 0 auto 30px;
}

.cta-button {
  background: var(--secondary-color);
  border: none;
  color: var(--accent-color);
  padding: 15px 30px;
  font-size: 18px;
  cursor: pointer;
  transition: transform var(--transition-speed) ease, background var(--transition-speed) ease;
}

.cta-button:hover {
  transform: scale(1.1);
  background: var(--primary-color);
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
  padding: 40px;
}

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

.grid-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

@media (max-width: 768px) {
  .grid-container {
    grid-template-columns: 1fr;
  }
}

pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 15px;
  border-radius: 5px;
  overflow-x: auto;
}

code {
  font-family: 'Courier New', Courier, monospace;
}

footer {
  text-align: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.8);
}

.img-decorative {
  width: 100%;
  height: auto;
  border-radius: 10px;
}