:root {
    --dfms-layout-gutter: .75rem;
    --dfms-layout-compact-gutter: .625rem;
    --dfms-layout-sidebar-width: 15.25rem;
    --dfms-layout-sidebar-collapsed-width: 4rem;
    --dfms-layout-control-size: var(--dfms-icon-control-size, 2.25rem);
    --dfms-layout-mobile-control-size: 2.75rem;
    --dfms-layout-mobile-control-offset: .375rem;
    --dfms-layout-topbar-height: 3.5rem;
    --dfms-layout-topbar-control-inset: .5rem;
    --dfms-layout-transition: 260ms cubic-bezier(.2, .8, .2, 1);
    --dfms-layout-safe-top: env(safe-area-inset-top, 0px);
    --dfms-layout-safe-right: env(safe-area-inset-right, 0px);
    --dfms-layout-safe-bottom: env(safe-area-inset-bottom, 0px);
    --dfms-layout-safe-left: env(safe-area-inset-left, 0px);
}

/* Shell geometry is owned exclusively by navigation.css. */
.main-layout {
    display: grid;
    grid-template-columns:
        calc(var(--dfms-layout-sidebar-width) + (var(--dfms-layout-gutter) * 2))
        minmax(0, 1fr);
    width: 100%;
    max-width: 100%;
    height: 100dvh;
    min-height: 0;
    overflow: hidden;
    background: var(--dfms-page);
    transition: grid-template-columns var(--dfms-layout-transition);
}

body:has(.sidebar-collapsed) .main-layout {
    grid-template-columns:
        calc(var(--dfms-layout-sidebar-collapsed-width) + (var(--dfms-layout-gutter) * 2))
        minmax(0, 1fr);
}

.main-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-gutter: stable;
}

.main-layout:has(.archive-dialog-backdrop) .main-content {
    overflow: hidden;
}

.sidebar,
.top-bar {
    border: 1px solid var(--dfms-border);
    border-radius: var(--dfms-surface-radius, var(--radius-xl));
    background: var(--dfms-surface);
    box-shadow: var(--dfms-surface-shadow, 0 .4rem 1.2rem rgb(15 23 42 / 6%));
}

/* Sidebar */
.sidebar {
    position: relative;
    align-self: start;
    display: flex;
    flex-direction: column;
    width: calc(100% - (var(--dfms-layout-gutter) * 2));
    height: calc(100dvh - (var(--dfms-layout-gutter) * 2));
    min-width: 0;
    min-height: 0;
    padding: 0;
    margin: var(--dfms-layout-gutter);
    overflow: hidden;
}

.sidebar-header {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    gap: .625rem;
    min-width: 0;
    min-height: 4.125rem;
    padding: .6875rem .75rem;
    border-bottom: 1px solid var(--dfms-border);
}

.sidebar-brand {
    display: flex;
    flex: 1 1 auto;
    flex-direction: row;
    align-items: center;
    gap: .625rem;
    min-width: 0;
    max-width: 12rem;
    margin-inline-start: auto;
    overflow: hidden;
    color: var(--dfms-text);
    font-size: 1.02rem;
    font-weight: 800;
    line-height: 1;
    white-space: nowrap;
    direction: ltr;
    opacity: 1;
    transition: max-width var(--dfms-layout-transition), opacity 120ms ease;
}

.sidebar-brand-name {
    min-width: 0;
    overflow: hidden;
    direction: ltr;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-brand-mark {
    display: grid;
    place-items: center;
    flex: 0 0 var(--dfms-layout-control-size);
    width: var(--dfms-layout-control-size);
    height: var(--dfms-layout-control-size);
    border-radius: var(--radius-lg);
    color: #fff;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    box-shadow: 0 .35rem .85rem rgb(59 130 246 / 25%);
    font-size: 1.15rem;
    font-weight: 800;
}

.sidebar-collapse-toggle,
.sidebar-mobile-toggle {
    display: inline-grid;
    place-content: center;
    gap: .2rem;
    flex: 0 0 var(--dfms-layout-control-size);
    width: var(--dfms-layout-control-size);
    height: var(--dfms-layout-control-size);
    min-width: var(--dfms-layout-control-size);
    min-height: var(--dfms-layout-control-size);
    padding: 0;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    color: var(--dfms-text-muted);
    background: transparent;
    line-height: 1;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition:
        background-color var(--dfms-transition-fast),
        border-color var(--dfms-transition-fast),
        color var(--dfms-transition-fast),
        box-shadow var(--dfms-transition-fast);
}

.sidebar-collapse-toggle:hover,
.sidebar-mobile-toggle:hover {
    color: var(--dfms-primary);
    background: var(--primary-container);
}

.sidebar-collapse-toggle span,
.sidebar-mobile-toggle span {
    display: block;
    width: 1.05rem;
    height: .12rem;
    border-radius: 1rem;
    background: currentColor;
    transition:
        transform var(--dfms-transition-fast),
        opacity var(--dfms-transition-fast);
}

.sidebar-mobile-toggle[aria-expanded="true"] {
    color: var(--dfms-primary);
    background: var(--primary-container);
}

.sidebar-mobile-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(.32rem) rotate(45deg);
}

.sidebar-mobile-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.sidebar-mobile-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-.32rem) rotate(-45deg);
}

/* Navigation */
.nav-menu {
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    gap: .1875rem;
    min-width: 0;
    min-height: 0;
    padding: .625rem .5rem .75rem;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: thin;
    scrollbar-color: var(--dfms-border) transparent;
}

.nav-menu::-webkit-scrollbar {
    width: .5rem;
}

.nav-menu::-webkit-scrollbar-track {
    background: transparent;
}

.nav-menu::-webkit-scrollbar-thumb {
    border: .125rem solid transparent;
    border-radius: 999px;
    background: var(--dfms-border);
    background-clip: padding-box;
}

.nav-item,
.sidebar-logout {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: .625rem;
    width: 100%;
    min-width: 0;
    min-height: 2.875rem;
    padding: .625rem .875rem;
    border: 0;
    border-radius: var(--radius-lg);
    color: var(--dfms-text-muted);
    background: transparent;
    font: inherit;
    font-size: .88rem;
    font-weight: 500;
    line-height: 1.25;
    text-align: start;
    text-decoration: none;
    direction: rtl;
    cursor: pointer;
    transition:
        color var(--dfms-transition-fast),
        background-color var(--dfms-transition-fast),
        padding-inline var(--dfms-layout-transition),
        gap var(--dfms-layout-transition);
}

.nav-item:hover {
    color: var(--dfms-text);
    background: rgb(102 126 234 / 6%);
}

.nav-item:active {
    background: rgb(102 126 234 / 14%);
}

.nav-item.active {
    color: var(--dfms-primary);
    background: var(--primary-container);
    font-weight: 650;
}

.nav-icon {
    flex: 0 0 1.25rem;
    width: 1.25rem;
    height: 1.25rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.nav-icon > * {
    vector-effect: non-scaling-stroke;
}

.nav-item-label {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    direction: rtl;
    text-align: right;
    text-overflow: ellipsis;
    white-space: nowrap;
    opacity: 1;
    transition: opacity 100ms ease;
}

.nav-item-unavailable,
.nav-item-unavailable:hover,
.nav-item-unavailable:active {
    color: var(--dfms-text-muted);
    background: transparent;
    opacity: .58;
    cursor: not-allowed;
}

.nav-label {
    min-height: 1rem;
    max-height: 1.5rem;
    margin: .8rem .875rem .25rem;
    overflow: hidden;
    color: var(--dfms-text-muted);
    direction: rtl;
    font-size: .7rem;
    font-weight: 650;
    line-height: 1.35;
    text-align: start;
    text-overflow: ellipsis;
    white-space: nowrap;
    opacity: .72;
    transition:
        max-height var(--dfms-layout-transition),
        margin-block var(--dfms-layout-transition),
        opacity 100ms ease;
}

.nav-separator {
    height: 1px;
    margin: .5rem .875rem;
    background: var(--dfms-border);
    opacity: .85;
}

/* Sidebar footer */
.sidebar-footer {
    flex: 0 0 auto;
    min-height: 4.125rem;
    padding: .625rem .5rem calc(.75rem + var(--dfms-layout-safe-bottom));
    border-top: 1px solid var(--dfms-border);
}

.sidebar-footer form {
    width: 100%;
    margin: 0;
}

.sidebar-logout {
    min-height: 2.875rem;
    color: var(--dfms-danger);
}

.sidebar-logout:hover {
    color: var(--dfms-danger);
    background: rgb(220 38 38 / 10%);
}

.nav-item:focus-visible,
.sidebar-collapse-toggle:focus-visible,
.sidebar-mobile-toggle:focus-visible,
.sidebar-logout:focus-visible,
.top-bar .theme-toggle:focus-visible {
    outline: 2px solid var(--dfms-primary);
    outline-offset: 2px;
    box-shadow: var(--dfms-focus-ring);
}

/* Desktop collapsed rail */
.sidebar-collapsed .sidebar-header {
    justify-content: center;
    gap: 0;
    padding-inline: .5rem;
}

.sidebar-collapsed .sidebar-brand {
    flex: 0 0 0;
    max-width: 0;
    margin: 0;
    opacity: 0;
    pointer-events: none;
}

.sidebar-collapsed .nav-menu,
.sidebar-collapsed .sidebar-footer {
    padding-inline: .5rem;
}

.sidebar-collapsed .nav-item,
.sidebar-collapsed .sidebar-logout {
    justify-content: center;
    gap: 0;
    padding-inline: 0;
}

.sidebar-collapsed .nav-icon {
    flex-basis: 1.25rem;
}

.sidebar-collapsed .nav-item-label {
    flex: 0 0 0;
    width: 0;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
}

.sidebar-collapsed .nav-label {
    max-height: 0;
    min-height: 0;
    margin-block: 0;
    visibility: hidden;
    opacity: 0;
}

.sidebar-collapsed .nav-separator {
    margin-inline: .5rem;
}

/* Top bar */
.top-bar {
    position: sticky;
    top: var(--dfms-layout-gutter);
    z-index: 10;
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: space-between;
    gap: .75rem;
    width: auto;
    min-width: 0;
    min-height: var(--dfms-layout-topbar-height);
    padding: .5rem .75rem;
    margin-block-start: var(--dfms-layout-gutter);
    margin-inline-start: 0;
    margin-inline-end: var(--dfms-layout-gutter);
}

.top-bar-title {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    color: var(--dfms-text);
    direction: ltr;
    font-size: .95rem;
    font-weight: 650;
    line-height: 1.25;
    text-align: start;
    text-overflow: ellipsis;
    white-space: nowrap;
    unicode-bidi: isolate;
}

.top-bar-right {
    display: inline-flex;
    flex: 0 0 auto;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: flex-end;
    gap: .625rem;
    min-width: 0;
    max-width: min(28rem, 55%);
}

.top-bar .user-profile {
    display: inline-flex;
    flex: 0 1 auto;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    min-width: 0;
    max-width: 100%;
    margin: 0;
    white-space: nowrap;
}

.top-bar .user-name {
    display: block;
    min-width: 0;
    max-width: min(22rem, 28vw);
    margin: 0;
    overflow: hidden;
    color: var(--dfms-text);
    font-size: .9rem;
    font-weight: 600;
    line-height: 1.25;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.top-bar .theme-toggle {
    flex: 0 0 var(--dfms-layout-control-size);
    width: var(--dfms-layout-control-size);
    min-width: var(--dfms-layout-control-size);
    height: var(--dfms-layout-control-size);
    min-height: var(--dfms-layout-control-size);
    margin: 0;
}

.sidebar-mobile-toggle,
.sidebar-scrim {
    display: none;
}

:root[data-theme="dark"] .sidebar,
:root[data-theme="dark"] .top-bar {
    box-shadow: 0 .45rem 1.35rem rgb(0 0 0 / 20%);
}

:root[data-theme="dark"] .nav-item:hover {
    color: var(--dfms-primary);
    background: var(--primary-container);
}

:root[data-theme="dark"] .sidebar-logout:hover {
    color: var(--dfms-danger);
    background: rgb(220 38 38 / 14%);
}

/* Drawer mode starts at 64rem and stays independent from desktop collapsed state. */
@media (max-width: 64rem) {
    .main-layout,
    body:has(.sidebar-collapsed) .main-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .sidebar {
        position: fixed;
        z-index: 30;
        align-self: stretch;
        top: calc(var(--dfms-layout-safe-top) + var(--dfms-layout-compact-gutter));
        right: calc(var(--dfms-layout-safe-right) + var(--dfms-layout-compact-gutter));
        bottom: calc(var(--dfms-layout-safe-bottom) + var(--dfms-layout-compact-gutter));
        left: auto;
        display: flex;
        width: min(
            15.5rem,
            calc(
                100%
                - var(--dfms-layout-safe-right)
                - var(--dfms-layout-safe-left)
                - (var(--dfms-layout-compact-gutter) * 2)
            )
        );
        max-width: calc(100% - var(--dfms-layout-compact-gutter));
        height: auto;
        max-height: calc(
            100dvh
            - var(--dfms-layout-safe-top)
            - var(--dfms-layout-safe-bottom)
            - (var(--dfms-layout-compact-gutter) * 2)
        );
        margin: 0;
        visibility: hidden;
        pointer-events: none;
        border-radius: var(--dfms-surface-radius, var(--radius-xl));
        transform: translateX(
            calc(
                100%
                + var(--dfms-layout-safe-right)
                + var(--dfms-layout-compact-gutter)
            )
        );
        transition:
            transform 220ms cubic-bezier(.2, .8, .2, 1),
            visibility 0s linear 220ms;
    }

    .sidebar-mobile-open {
        visibility: visible;
        pointer-events: auto;
        transform: translateX(0);
        transition:
            transform 220ms cubic-bezier(.2, .8, .2, 1),
            visibility 0s linear 0s;
    }

    .sidebar-collapse-toggle {
        display: none;
    }

    .sidebar-header,
    .sidebar-collapsed .sidebar-header {
        justify-content: flex-start;
        min-height: var(--dfms-layout-topbar-height);
        gap: .625rem;
        padding-block: .5rem;
        padding-inline-start: calc(
            var(--dfms-layout-mobile-control-size)
            + var(--dfms-layout-topbar-control-inset)
            + .75rem
        );
        padding-inline-end: .75rem;
    }

    .sidebar-brand,
    .sidebar-collapsed .sidebar-brand {
        display: flex;
        flex: 1 1 auto;
        max-width: 12rem;
        margin-inline-start: 0;
        opacity: 1;
        pointer-events: auto;
    }

    .sidebar-collapsed .nav-menu {
        padding: .625rem .5rem .75rem;
    }

    .sidebar-collapsed .sidebar-footer {
        padding-inline: .5rem;
    }

    .sidebar-collapsed .nav-item,
    .sidebar-collapsed .sidebar-logout {
        justify-content: flex-start;
        gap: .625rem;
        padding-inline: .875rem;
    }

    .sidebar-collapsed .nav-icon {
        flex-basis: 1.25rem;
    }

    .sidebar-collapsed .nav-item-label {
        flex: 1 1 auto;
        width: auto;
        visibility: visible;
        opacity: 1;
        pointer-events: auto;
    }

    .sidebar-collapsed .nav-label {
        min-height: 1rem;
        max-height: 1.5rem;
        margin: .8rem .875rem .25rem;
        visibility: visible;
        opacity: .72;
    }

    .sidebar-collapsed .nav-separator {
        margin-inline: .875rem;
    }

    .sidebar-footer {
        min-height: 4.25rem;
        padding-bottom: calc(.75rem + var(--dfms-layout-safe-bottom));
    }

    .sidebar-mobile-toggle {
        position: fixed;
        z-index: 25;
        top: calc(
            var(--dfms-layout-safe-top)
            + var(--dfms-layout-compact-gutter)
            + var(--dfms-layout-mobile-control-offset)
        );
        right: calc(
            var(--dfms-layout-safe-right)
            + var(--dfms-layout-compact-gutter)
            + var(--dfms-layout-topbar-control-inset)
        );
        display: inline-grid;
        flex-basis: var(--dfms-layout-mobile-control-size);
        width: var(--dfms-layout-mobile-control-size);
        min-width: var(--dfms-layout-mobile-control-size);
        height: var(--dfms-layout-mobile-control-size);
        min-height: var(--dfms-layout-mobile-control-size);
        border-color: var(--dfms-border);
        color: var(--dfms-primary);
        background: var(--dfms-surface);
        box-shadow: var(--shadow-sm);
    }

    .sidebar-mobile-toggle[aria-expanded="true"] {
        z-index: 31;
    }

    .sidebar-scrim {
        position: fixed;
        z-index: 29;
        inset: 0;
        display: block;
        border: 0;
        background: rgb(15 23 42 / 38%);
    }

    .top-bar {
        top: calc(var(--dfms-layout-safe-top) + var(--dfms-layout-compact-gutter));
        height: var(--dfms-layout-topbar-height);
        min-height: var(--dfms-layout-topbar-height);
        padding-block: var(--dfms-layout-mobile-control-offset);
        padding-inline-start: calc(
            var(--dfms-layout-mobile-control-size)
            + var(--dfms-layout-topbar-control-inset)
            + .75rem
        );
        padding-inline-end: .75rem;
        margin-block-start: calc(var(--dfms-layout-safe-top) + var(--dfms-layout-compact-gutter));
        margin-inline-start: calc(var(--dfms-layout-safe-right) + var(--dfms-layout-compact-gutter));
        margin-inline-end: calc(var(--dfms-layout-safe-left) + var(--dfms-layout-compact-gutter));
    }

    .top-bar-right {
        max-width: 52%;
        gap: .5rem;
    }

    .top-bar .theme-toggle {
        flex-basis: var(--dfms-layout-mobile-control-size);
        width: var(--dfms-layout-mobile-control-size);
        min-width: var(--dfms-layout-mobile-control-size);
        height: var(--dfms-layout-mobile-control-size);
        min-height: var(--dfms-layout-mobile-control-size);
    }

    .top-bar .user-name {
        max-width: min(12rem, 22vw);
    }
}

@media (max-width: 34rem) {
    .top-bar {
        gap: .5rem;
        padding-inline-start: calc(
            var(--dfms-layout-mobile-control-size)
            + var(--dfms-layout-topbar-control-inset)
            + .625rem
        );
        padding-inline-end: .625rem;
    }

    .top-bar-right {
        max-width: 58%;
        gap: .375rem;
    }

    .top-bar .user-name {
        max-width: min(7rem, 24vw);
        font-size: .82rem;
    }

    .top-bar-title {
        font-size: .88rem;
    }
}

@media (max-height: 32rem) and (max-width: 64rem) {
    .nav-menu {
        padding-block: .375rem;
    }

    .sidebar-footer {
        min-height: 3.875rem;
        padding-top: .5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .main-layout,
    .sidebar,
    .sidebar-brand,
    .nav-item,
    .nav-item-label,
    .nav-label,
    .sidebar-logout,
    .sidebar-collapse-toggle,
    .sidebar-mobile-toggle,
    .sidebar-mobile-toggle span {
        transition: none;
    }
}