:root {
    --primary-color: #003366;
    --secondary-color: #4b0082;
    --accent-color: #00ffff;
    --light-bg: #f5f5f5;
    --dark-bg: #1a1a1a;
    --font-family: 'Helvetica', 'Arial', sans-serif;
}

body {
    margin: 0;
    font-family: var(--font-family);
    background: linear-gradient(to bottom, var(--primary-color), var(--dark-bg));
    color: #ffffff;
    line-height: 1.6;
}

header {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

header h1 {
    font-size: 2.5rem;
    margin: 0;
    color: #ffffff;
}

main {
    padding: 20px;
    max-width: 1440px;
    margin: 0 auto;
}

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

.grid-item {
    background: var(--light-bg);
    color: #333333;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease-in-out;
}

.grid-item:hover {
    transform: scale(1.05);
}

.grid-item img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

code {
    display: block;
    background: #2d2d2d;
    color: #ffffff;
    padding: 10px;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

table th, table td {
    border: 1px solid #cccccc;
    padding: 10px;
    text-align: left;
}

table th {
    background: var(--accent-color);
    color: #ffffff;
}

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

    .grid-container {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.8rem;
    }

    .grid-item {
        padding: 15px;
    }
}