body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f7f7f7;
    color: #333;
}

header {
    background: #0057b7;
    color: white;
    padding: 60px 20px;
    text-align: center;
}

header .btn {
    background: #ffcc00;
    padding: 12px 25px;
    color: #000;
    text-decoration: none;
    font-weight: bold;
    border-radius: 5px;
}

nav {
    background: #003f82;
    padding: 10px;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 25px;
    margin: 0;
    padding: 0;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 40px auto;
}

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

.card {
    background: white;
    padding: 20