body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
}

header {
    background: #1a1a1a;
    color: white;
    padding: 60px 20px;
    text-align: center;
}

header button {
    padding: 12px 25px;
    background: #0078ff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 15px;
}

header button:hover {
    background: #005fcc;
}

section {
    padding: 30px;
    background: white;
    margin: 20px;
    border-radius: 8px;
}

h2 {
    margin-top: 0;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.card {
    background: #fafafa;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #ddd;
    text-align: center;
}

.card:hover {
    background: #eef6ff;
    border-color: #0078ff;
}

footer {
    background: #1a1a1a;
    color: white;
    text-align: center;
    padding: 15px;
    margin-top: 20px;
}