.rail > a, .navigation-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
}
.navigation-toggle {
    display: none;
    padding: 0;
    background: transparent;
    color: var(--neutral-ink);
}
.app-navigation .sidebar-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-shrink: 0;
}
.navigation-close {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    color: var(--ink);
}
.navigation-mobile-actions, .navigation-drawer-only { display: none; }
.navigation-backdrop {
    position: fixed;
    inset: 0;
    background: #0009;
    z-index: 30;
}
.navigation-backdrop[hidden] { display: none; }
.navigation-is-open { overflow: hidden; }
.navigation-is-open .app-navigation {
    display: flex;
    position: fixed;
    inset: 0 auto 0 56px;
    width: min(320px, calc(100vw - 56px));
    height: 100dvh;
    min-height: 0;
    z-index: 31;
    overflow-y: auto;
    overscroll-behavior: contain;
    box-shadow: 6px 0 24px #0004;
}
.navigation-is-open .navigation-close { display: inline-flex; align-items: center; justify-content: center; }
.app-navigation .planning-nav a { min-height: 44px; }
@media (min-width: 901px) {
    .app-navigation .planning-nav a, .app-navigation .folder-toggle {
        min-height: 38px;
        padding-top: 8px;
        padding-bottom: 8px;
        margin-top: 2px;
        margin-bottom: 2px;
    }
    .app-navigation .planning-nav .selected {
        background: color-mix(in srgb, var(--selected) 55%, transparent);
    }
    .app-navigation .planning-nav a.nav-create-button {
        width: fit-content;
        min-height: 32px;
        padding: 6px 10px;
        margin-top: 12px;
        background: transparent;
        border-color: transparent;
        font-size: 12px;
    }
    .app-navigation .planning-nav a.nav-create-button:hover {
        background: var(--hover);
    }
}
.navigation-folder-heading { display: flex; align-items: center; }
.folder-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: flex-start;
    flex-shrink: 0;
    width: 100%;
    min-height: 44px;
    padding: 11px 12px;
    margin: 3px 0;
    gap: 12px;
    text-align: left;
    font-weight: 400;
    color: var(--neutral-ink);
    background: transparent;
}
.folder-toggle:hover { background: var(--hover); }
.folder-toggle span { display: inline-flex; width: 22px; flex-shrink: 0; font-size: 19px; }
.app-navigation .navigation-folder-children { margin-left: 23px; border-left: 1px solid var(--line); padding-left: 6px; }
.app-navigation .navigation-folder-children[hidden] { display: none; }
.app-navigation .navigation-folder-children a.folder-project { padding-left: 12px; font-size: 13px; }

@media (max-width: 900px) {
    .planner-shell .rail {
        inset: 0 0 auto;
        width: 100%;
        height: calc(64px + env(safe-area-inset-top));
        padding: env(safe-area-inset-top) max(8px, env(safe-area-inset-right)) 0 max(8px, env(safe-area-inset-left));
        flex-direction: row;
        gap: 2px;
        border-bottom: 1px solid var(--line);
        z-index: 12;
    }
    .planner-shell .navigation-toggle { display: flex; }
    .planner-shell .rail-bottom {
        margin: 0 0 0 auto;
        padding: 0;
        flex-direction: row;
        gap: 0;
    }
    .planner-shell .rail-bottom > a { width: 44px; height: 44px; }
    .planner-shell .rail-bottom > .theme-toggle, .planner-shell .rail-bottom > form { display: none; }
    .planner-shell .workspace {
        display: block;
        margin-left: 0;
        padding-top: calc(64px + env(safe-area-inset-top));
        min-height: 100dvh;
    }
    .app-navigation { display: none; }
    .navigation-is-open .app-navigation {
        inset: 0 auto 0 0;
        width: min(320px, 88vw);
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
    }
    .app-navigation .sidebar-title { height: 64px; padding: 10px 16px; }
    .app-navigation .planning-nav { display: block; padding: 8px 12px; }
    .app-navigation .planning-nav a { padding: 10px 12px; font-size: 14px; gap: 12px; }
    .app-navigation .folder-toggle { width: 100%; padding: 10px 12px; font-size: 14px; }
    .app-navigation .planning-nav span { display: inline-flex; width: 22px; font-size: 19px; }
    .app-navigation .planning-nav a.nav-create-button { min-height: 36px; font-size: 12px; padding: 6px 10px; }
    .app-navigation .nav-heading { display: block; }
    .app-navigation .sidebar-user { display: block; margin-top: 0; padding: 16px 22px; }
    .navigation-mobile-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; padding: 16px 22px 0; }
    .navigation-mobile-actions .row-button { display: inline-flex; gap: 8px; align-items: center; min-height: 44px; }
    .navigation-mobile-actions form { margin: 0; }
    .planner-shell .page-header { padding: 0 16px; }
    .planner-shell .page-body { padding: 18px 12px; }
}