.app-container {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 30px;
    width: 100%;
    margin: 0;
}

.main-layout {
    display: flex;
    flex: 1;
    gap: 0;
    overflow: hidden;
}

.grid-section {
    flex: 1;
    overflow: hidden;
    padding-right: 10px;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative; /* For absolute positioning of children like delete zone */
}

.layout-resizer {
    width: 10px;
    cursor: col-resize;
    background: transparent;
    transition: background 0.2s;
    flex-shrink: 0;
    z-index: 10;
    border-radius: 100px;
}
.layout-resizer:hover, .layout-resizer.resizing {
    background: rgba(255,255,255,0.1);
}