body { margin: 0; font-family: 'Roboto', sans-serif; background: linear-gradient(135deg, #0f2027, #203a43, #2c5364); color: white; line-height: 1.6; overflow-x: hidden; } 
.container { max-width: 1440px; margin: auto; padding: 0 20px; display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
header { position: fixed; top: 0; left: 0; width: 100%; background: rgba(44, 83, 100, 0.9); z-index: 1000; }
nav ul { list-style: none; padding: 0; display: flex; justify-content: center; align-items: center; height: 60px; }
nav li { position: relative; }
nav li a { color: white; text-decoration: none; padding: 15px 20px; display: block; transition: all 0.3s ease; }
nav li a:hover { background-color: #0f2027; }
.hero { height: 100vh; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; position: relative; }
.hero::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: url('https://images.gptkong.com/demo/sample1.png'), url('https://images.gptkong.com/demo/sample2.png'); background-size: contain; background-repeat: no-repeat; background-position: top left, bottom right; opacity: 0.2; z-index: -1; }
.hero h1 { font-size: 3rem; margin-bottom: 20px; }
.hero p { font-size: 1.2rem; max-width: 600px; }
.cta-button { background-color: #2ecc71; color: white; border: none; padding: 15px 30px; font-size: 1rem; cursor: pointer; transition: all 0.3s ease; border-radius: 50px; }
.cta-button:hover { background-color: #27ae60; }
.card { background-color: white; color: #333; border-radius: 8px; box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); margin: 20px; padding: 15px; transition: transform 0.3s ease, box-shadow 0.3s ease; }
.card:hover { transform: translateY(-5px); box-shadow: 0 8px 12px rgba(0, 0, 0, 0.2); }
.card img { width: 100%; height: auto; border-radius: 8px 8px 0 0; object-fit: cover; }
.card h3 { font-size: 1.5rem; margin: 15px 0; }
.card p { font-size: 1rem; line-height: 1.5; }
@media (max-width: 768px) { .hero h1 { font-size: 2rem; } nav li { display: none; } nav li:first-child { display: block; } }
footer { background: #2c5364; color: white; text-align: center; padding: 20px; margin-top: 50px; }
footer p { margin: 0; font-size: 0.9rem; }