body, html {
    margin: 0;
    padding: 0;
    font-family: 'Montserrat', 'Roboto', sans-serif;
    line-height: 1.6;
    color: #ffffff;
    background: linear-gradient(to bottom, #00008b, #000000);
    overflow-x: hidden;
}

header {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: url("https://images.gptkong.com/demo/sample1.png") no-repeat center center/cover;
    background-blend-mode: overlay;
    background-color: rgba(0, 0, 139, 0.7);
}

header h1 {
    font-size: 4rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: #ffd700;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.7);
}

header p {
    font-size: 1.5rem;
    margin-top: 10px;
    color: #ffffff;
}

.container {
    max-width: 1200px;
    margin: 50px auto;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    background: rgba(0, 0, 0, 0.5);
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: scale(1.05);
}

.card img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

.card-content {
    padding: 20px;
}

.card h3 {
    font-size: 1.5rem;
    color: #ffd700;
    margin-bottom: 10px;
}

.card p {
    font-size: 1rem;
    color: #ffffff;
}

.code-block {
    background: rgba(0, 0, 0, 0.7);
    color: #ffffff;
    padding: 15px;
    border-radius: 5px;
    margin: 20px 0;
    overflow-x: auto;
}

.code-block code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.4;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 3rem;
    }

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

@media (max-width: 480px) {
    header h1 {
        font-size: 2rem;
    }

    .card h3 {
        font-size: 1.2rem;
    }
}

.particle-effect {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.particle {
    position: absolute;
    width: 5px;
    height: 5px;
    background-color: #ffffff;
    border-radius: 50%;
    animation: float 4s infinite;
}

@keyframes float {
    0% { transform: translateY(0); opacity: 1; }
    50% { transform: translateY(-20px); opacity: 0.5; }
    100% { transform: translateY(0); opacity: 1; }
}