/*
 * Application shell (REQ-AB122-FUNC-019): sidebar on wide viewports that the user can hide behind a top bar
 * (html[data-sidebar="hidden"], set by portal.js), off-canvas overlay behind the top bar on narrow viewports.
 */

.app-shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    min-height: 100vh;
    background: var(--surface-base);
    color: var(--text-primary);
}

.app-topbar {
    display: none;
    grid-column: 1;
    position: sticky;
    top: 0;
    z-index: 20;
    align-items: center;
    gap: var(--space-sm);
    padding: 0 var(--space-sm);
    border-bottom: 1px solid var(--line-subtle);
    background: var(--surface-card);
}

.app-topbar__brand {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--text-primary);
}

.app-topbar__show {
    display: none;
}

.app-main {
    grid-column: 2;
    grid-row: 1;
    min-width: 0;
    padding: var(--space-xl) var(--space-2xl) var(--space-3xl);
}

/* Sidebar */

.app-sidebar {
    grid-column: 1;
    grid-row: 1;
    position: sticky;
    top: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    border-right: 1px solid var(--line-subtle);
    background: var(--surface-sidebar);
}

.app-sidebar__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-md) var(--space-sm);
}

.app-sidebar__close {
    display: none;
}

/* Hide, show and close controls stay quiet: muted icon, no fill until hovered. */
.sidebar-toggle::part(control) {
    background: transparent;
    color: var(--text-muted);
}

.sidebar-toggle:hover::part(control) {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.app-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    min-width: 0;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
}

.app-brand:hover {
    color: var(--text-primary);
}

.app-brand__mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 2rem;
    height: 2rem;
}

.app-brand__mark img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.app-brand__text {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.app-brand__title {
    font-family: var(--font-display);
    font-size: var(--font-size-md);
    font-weight: 600;
    line-height: var(--leading-tight);
}

.app-brand__subtitle {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.app-sidebar__search {
    padding: var(--space-xs) var(--space-md) var(--space-sm);
}

.app-sidebar__nav {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    padding-bottom: var(--space-md);
}

.app-sidebar__footer {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md) var(--space-md);
    border-top: 1px solid var(--line-subtle);
}

.app-user-block {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-xs);
}

.app-user {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    min-width: 0;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.app-user:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.app-user__name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.app-signout {
    margin: 0;
    flex-shrink: 0;
}

.app-sidebar__legal {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--space-xs) var(--space-sm);
    margin: var(--space-xs) var(--space-sm) 0;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

/* Navigation */

.side-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 0 var(--space-sm);
}

.side-nav__label {
    margin: var(--space-md) var(--space-sm) var(--space-xs);
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--text-muted);
}

.side-nav__link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.45rem 0.65rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition: background-color var(--transition), color var(--transition);
}

.side-nav__link:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.side-nav__link.is-active {
    background: var(--surface-brand);
    color: var(--brand-strong);
    font-weight: 600;
}

/* Sidebar search trigger (native button) and theme toggle (Fluent button; host sizing only, internals via ::part) */

.search-trigger--field {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    min-width: 0;
    min-height: 2.25rem;
    padding: 0 0.5rem 0 0.625rem;
    border: 1px solid var(--line-default);
    border-radius: var(--radius-md);
    background: var(--surface-card);
    color: var(--text-secondary);
    font: inherit;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: border-color var(--transition), background-color var(--transition);
}

.search-trigger--field:hover {
    border-color: var(--line-strong);
}

.search-trigger--field:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}

.search-trigger--field > .portal-icon,
.search-trigger--field > .shortcut-hint {
    flex-shrink: 0;
}

/* The label is sized to fit the sidebar; the ellipsis only guards against wider fallback fonts. */
.search-trigger__label {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: left;
    color: var(--text-muted);
}

.theme-toggle__content {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
}

.theme-toggle {
    width: 100%;
}

.theme-toggle::part(control) {
    justify-content: flex-start;
}

.app-brand:focus-visible,
.app-user:focus-visible,
.app-topbar__brand:focus-visible,
.side-nav__link:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}

/* Narrow viewports: top bar + off-canvas sidebar */

@media (max-width: 767.98px) {
    .app-shell {
        grid-template-columns: minmax(0, 1fr);
        grid-template-rows: var(--header-height) 1fr;
    }

    .app-topbar {
        display: flex;
    }

    .app-sidebar__hide {
        display: none;
    }

    .app-main {
        grid-column: 1;
        grid-row: 2;
        padding: var(--space-lg) var(--space-md) var(--space-2xl);
    }

    .app-sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        z-index: 40;
        width: min(20rem, 86vw);
        height: auto;
        box-shadow: var(--shadow-lg);
        transform: translateX(-100%);
        /* Hidden (not just off-screen) so closed links are skipped by Tab and screen readers. */
        visibility: hidden;
        transition: transform var(--transition), visibility 0s linear var(--duration-base);
    }

    .app-sidebar.is-open {
        transform: translateX(0);
        visibility: visible;
        transition: transform var(--transition), visibility 0s;
    }

    .app-sidebar__close {
        display: inline-flex;
    }

    .app-shell__backdrop {
        position: fixed;
        inset: 0;
        z-index: 30;
        background: var(--overlay-backdrop);
    }
}

@media (min-width: 768px) {
    .app-shell__backdrop,
    .app-topbar__menu {
        display: none;
    }

    html[data-sidebar="hidden"] .app-shell {
        grid-template-columns: minmax(0, 1fr);
        grid-template-rows: var(--header-height) 1fr;
    }

    html[data-sidebar="hidden"] .app-topbar {
        display: flex;
    }

    html[data-sidebar="hidden"] .app-topbar__show {
        display: inline-flex;
    }

    html[data-sidebar="hidden"] .app-sidebar {
        display: none;
    }

    html[data-sidebar="hidden"] .app-main {
        grid-column: 1;
        grid-row: 2;
    }
}

@media (max-width: 1024px) and (min-width: 768px) {
    .app-main {
        padding: var(--space-lg);
    }
}