body {
    margin: 0;
    font-family: Arial, sans-serif;
    line-height: 1.6;
}
.container {
    width: 90%;
    max-width: 1100px;
    margin: auto;
}
header {
    background: #222;
    color: #fff;
    padding: 20px 0;
    text-align: center;
}
header nav a {
    color: #fff;
    margin: 0 10px;
    text-decoration: none;
}
header nav a:hover {
    text-decoration: underline;
}
.section {
    padding: 40px 0;
}
.bg-light {
    background: #f4f4f4;
}
.grid {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}
.card {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    flex: 1 1 calc(33% - 20px);
    min-width: 250px;
}
footer {
    background: #222;
    color: #fff;
    text-align: center;
    padding: 10px 0;
}