body, html {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    color: #fff;
    background: linear-gradient(135deg, #1E3A8A, #0EA5E9);
    overflow-x: hidden;
    line-height: 1.6;
}

header {
    position: relative;
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: #fff;
    overflow: hidden;
}

header h1 {
    font-size: 3rem;
    font-weight: bold;
    text-shadow: 2px 2px 4px 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: 4rem 2rem;
    background: linear-gradient(135deg, #0D1B3E, #172B4D);
    position: relative;
    z-index: 1;
}

section:nth-child(even) {
    background: linear-gradient(135deg, #172B4D, #0D1B3E);
}

section h2 {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
    color: #0EA5E9;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

section p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

section pre {
    background: rgba(255, 255, 255, 0.1);
    padding: 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
}

section code {
    color: #FFD700;
    font-weight: bold;
}

.parallax {
    height: 500px;
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
    z-index: -1;
}

.parallax:nth-of-type(1) {
    background-image: url('https://images.gptkong.com/demo/sample2.png');
}

.parallax:nth-of-type(2) {
    background-image: url('https://images.gptkong.com/demo/sample3.png');
}

.button {
    display: inline-block;
    background-color: #0EA5E9;
    color: #fff;
    font-size: 1rem;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.button:hover {
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

.button:active {
    background-color: #07F;
    transform: translateY(0);
}

ul {
    list-style: none;
    padding: 0;
}

ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

ul li::before {
    content: '•';
    color: #0EA5E9;
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
}

table th, table td {
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 10px;
    text-align: left;
    font-size: 1rem;
}

table th {
    background-color: rgba(0, 0, 0, 0.2);
    font-weight: bold;
}

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

    section h2 {
        font-size: 2rem;
    }

    section p {
        font-size: 1rem;
    }

    .parallax {
        height: 300px;
    }
}

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

    section h2 {
        font-size: 1.5rem;
    }

    section p {
        font-size: 0.9rem;
    }

    .parallax {
        height: 200px;
    }
}