#app-container {
    display: flex;
    min-height: 100vh;
}
#sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-tertiary);
    border-right: 1px solid var(--border-color);
    padding: 1rem 1rem var(--taskbar-height) 1rem;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1040;
    overflow-y: auto;
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
    transform: translateX(0);
}
#sidebar.collapsed {
    transform: translateX(calc(-1 * var(--sidebar-width)));
    box-shadow: none;
}
#sidebar:not(.collapsed) {
    box-shadow: 5px 0 15px var(--shadow-color);
}
#main-content-wrapper {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-smooth);
    margin-left: var(--sidebar-width);
}
#app-container.sidebar-collapsed #main-content-wrapper {
    margin-left: 0;
}
#top-header {
    height: var(--header-height);
    background-color: rgba(var(--rgb-bg-tertiary), 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 1rem;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1030;
    box-shadow: 0 2px 10px var(--shadow-color);
}
#main-content {
    padding: 1.5rem;
    flex-grow: 1;
    overflow-y: auto;
    padding-bottom: var(--taskbar-height);
}