/* 容器样式 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-sm {
    max-width: 640px;
}

.container-md {
    max-width: 768px;
}

.container-lg {
    max-width: 1024px;
}

.container-xl {
    max-width: 1280px;
}

.container-fluid {
    max-width: none;
}

/* 间距 */
.section {
    padding: 40px 0;
}

.section-sm {
    padding: 20px 0;
}

.section-lg {
    padding: 60px 0;
}

.section-xl {
    padding: 80px 0;
}