:root {
    --container-width: 1200px;
    --column-gap: 20px;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--column-gap);
}

/* 响应式断点 */
@media (max-width: 1200px) {
    .container {
        max-width: 960px;
    }
}

@media (max-width: 992px) {
    .container {
        max-width: 720px;
    }
}

@media (max-width: 768px) {
    .container {
        max-width: 540px;
    }
    .grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

@media (max-width: 576px) {
    .container {
        max-width: 100%;
    }
    .grid {
        grid-template-columns: repeat(4, 1fr);
    }
}