/* 主要布局 - 桌面端 (macOS 26 风格) */
.main-grid {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
    max-width: 1440px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 2;
    align-items: stretch;
}

/* 移动端适配 */
@media (max-width: 900px) {
    .main-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 1rem;
    }
}