body { margin: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: linear-gradient(135deg, #6A11CB, #2575FC, #00FFD1); color: #fff; line-height: 1.6; overflow-x: hidden; }
.container { max-width: 1440px; margin: auto; padding: 20px; display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
header { position: fixed; top: 0; width: 100%; background: rgba(0, 0, 0, 0.8); z-index: 1000; }
nav { display: flex; justify-content: space-between; align-items: center; padding: 10px 20px; }
nav a { color: #fff; text-decoration: none; margin: 0 10px; transition: all 0.3s ease; }
nav a:hover { transform: scale(1.1); }
.hero { height: 500px; background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center fixed; background-size: cover; position: relative; }
.hero::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0, 0, 0, 0.5); }
.hero h1 { position: relative; text-align: center; top: 40%; transform: translateY(-50%); color: #fff; font-size: 48px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin-top: 600px; }
.card { background: rgba(255, 255, 255, 0.1); border-radius: 10px; padding: 20px; text-align: center; transition: all 0.3s ease; }
.card:hover { transform: translateY(-10px); box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2); }
.masonry { column-count: 3; column-gap: 1em; margin-top: 40px; }
.item { break-inside: avoid; margin-bottom: 1em; background: rgba(255, 255, 255, 0.1); border-radius: 10px; padding: 20px; }
.button { position: relative; overflow: hidden; padding: 10px 20px; background: #fff; color: #000; border: none; cursor: pointer; }
.button::before { content: ''; position: absolute; top: 50%; left: 50%; width: 0; height: 0; background: rgba(255, 255, 255, 0.5); border-radius: 50%; transform: translate(-50%, -50%); animation: ripple 0.8s ease-out; opacity: 0; }
.button:hover::before { opacity: 1; width: 200px; height: 200px; }
@keyframes ripple { from { transform: translate(-50%, -50%) scale(0); opacity: 1; } to { transform: translate(-50%, -50%) scale(2.5); opacity: 0; } }
footer { background: #000; color: #fff; text-align: center; padding: 20px; margin-top: 40px; }
@media (max-width: 768px) { .masonry { column-count: 2; } }
@media (max-width: 480px) { .masonry { column-count: 1; } nav { flex-direction: column; } .hero h1 { font-size: 36px; } }