body, html {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    color: #333;
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    overflow-x: hidden;
    line-height: 1.6;
}

header {
    position: relative;
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png'), linear-gradient(135deg, #0f2027, #203a43);
    background-size: cover;
    background-position: center;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    overflow: hidden;
}

header h1 {
    font-size: 3rem;
    font-weight: bold;
    text-shadow: 2px 2px 8px 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); }
}

section {
    padding: 60px 20px;
    background: linear-gradient(135deg, #ffffff, #f5f5f5);
    position: relative;
    z-index: 1;
}

section:nth-child(even) {
    background: linear-gradient(135deg, #e0e0e0, #ffffff);
}

section h2 {
    font-size: 2.5rem;
    color: #2c5364;
    margin-bottom: 20px;
    text-align: center;
}

section p {
    font-size: 1rem;
    line-height: 1.8;
    max-width: 800px;
    margin: 0 auto;
}

.parallax {
    background-image: url('https://images.gptkong.com/demo/sample2.png');
    height: 50vh;
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
    z-index: -1;
}

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

.grid-item {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 20px;
    text-align: center;
    transition: transform 0.3s ease-in-out;
}

.grid-item:hover {
    transform: translateY(-10px);
}

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

code-block {
    background: #2d2d2d;
    color: #ffffff;
    padding: 15px;
    border-radius: 5px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    overflow-x: auto;
    margin: 20px 0;
}

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

    section h2 {
        font-size: 2rem;
    }

    section p {
        font-size: 0.9rem;
    }

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

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }

    section h2 {
        font-size: 1.8rem;
    }

    section p {
        font-size: 0.8rem;
    }
}