/* ==========================================================================
   Application shell: sidebar + topbar + content
   ========================================================================== */

.app {
    display: flex;
    min-height: 100vh;
}

/* ---- Sidebar ------------------------------------------------------------ */

.sidebar {
    position: fixed;
    inset-block: 0;
    inset-inline-start: 0;
    z-index: 60;
    display: flex;
    flex-direction: column;
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-inline-end: 1px solid var(--sidebar-border);
    transition: transform var(--transition-base), width var(--transition-base);
}

.sidebar__brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    height: var(--topbar-height);
    padding-inline: var(--space-5);
    flex-shrink: 0;
    border-block-end: 1px solid var(--sidebar-border);
    color: #fff;
    text-decoration: none;
}

.sidebar__brand:hover {
    color: #fff;
    text-decoration: none;
}

.sidebar__logo {
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--brand-400), var(--brand-600));
    color: #fff;
    font-size: 15px;
}

.sidebar__brand-text {
    display: flex;
    flex-direction: column;
    min-width: 0;
    line-height: 1.2;
}

.sidebar__brand-name {
    font-size: var(--text-md);
    font-weight: var(--weight-bold);
    letter-spacing: 0.02em;
}

.sidebar__brand-sub {
    font-size: 11px;
    color: var(--sidebar-text-muted);
    white-space: nowrap;
}

.sidebar__nav {
    flex: 1;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: var(--space-4) var(--space-3) var(--space-6);
}

.sidebar__section {
    margin-block-start: var(--space-5);
    margin-block-end: var(--space-2);
    padding-inline: var(--space-3);
    font-size: 10px;
    font-weight: var(--weight-semibold);
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--sidebar-text-muted);
}

.sidebar__section:first-child {
    margin-block-start: 0;
}

.sidebar__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.sidebar__link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    margin-block-end: 2px;
    border-radius: var(--radius-md);
    color: var(--sidebar-text);
    font-size: var(--text-base);
    font-weight: var(--weight-medium);
    text-decoration: none;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.sidebar__link:hover {
    background: var(--sidebar-hover-bg);
    color: #fff;
    text-decoration: none;
}

.sidebar__link[aria-current='page'] {
    background: var(--sidebar-active-bg);
    color: var(--sidebar-active-text);
    box-shadow: inset 2px 0 0 var(--brand-400);
}

.sidebar__icon {
    width: 18px;
    flex-shrink: 0;
    text-align: center;
    font-size: 14px;
    opacity: 0.9;
}

.sidebar__label {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar__footer {
    flex-shrink: 0;
    padding: var(--space-3) var(--space-4);
    border-block-start: 1px solid var(--sidebar-border);
    font-size: var(--text-xs);
    color: var(--sidebar-text-muted);
}

/* Collapsed (desktop icon rail) */
@media (min-width: 1025px) {
    .app.is-collapsed .sidebar {
        width: var(--sidebar-width-collapsed);
    }

    .app.is-collapsed .sidebar__brand-text,
    .app.is-collapsed .sidebar__label,
    .app.is-collapsed .sidebar__section,
    .app.is-collapsed .sidebar__footer {
        display: none;
    }

    .app.is-collapsed .sidebar__brand,
    .app.is-collapsed .sidebar__link {
        justify-content: center;
        padding-inline: 0;
    }

    .app.is-collapsed .main {
        margin-inline-start: var(--sidebar-width-collapsed);
    }
}

/* ---- Backdrop (mobile drawer) ------------------------------------------- */

.sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 55;
    background: rgba(2, 6, 23, 0.55);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

/* ---- Main --------------------------------------------------------------- */

.main {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    margin-inline-start: var(--sidebar-width);
    transition: margin var(--transition-base);
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 40;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    height: var(--topbar-height);
    padding-inline: var(--space-5);
    background: color-mix(in srgb, var(--color-surface) 88%, transparent);
    backdrop-filter: saturate(180%) blur(8px);
    border-block-end: 1px solid var(--color-border);
}

.topbar__toggle {
    display: grid;
    place-items: center;
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-text-secondary);
    font-size: 15px;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.topbar__toggle:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}

.topbar__title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    font-size: var(--text-md);
    font-weight: var(--weight-semibold);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.topbar__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ---- User menu ---------------------------------------------------------- */

.usermenu {
    position: relative;
}

.usermenu__trigger {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-2);
    border: 1px solid transparent;
    border-radius: var(--radius-full);
    background: transparent;
    color: var(--color-text);
    font: inherit;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.usermenu__trigger:hover {
    background: var(--color-surface-hover);
}

.usermenu__avatar {
    display: grid;
    place-items: center;
    width: 30px;
    height: 30px;
    flex-shrink: 0;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--brand-400), var(--brand-600));
    color: #fff;
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
}

.usermenu__name {
    font-size: var(--text-base);
    font-weight: var(--weight-medium);
    max-width: 160px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.usermenu__caret {
    font-size: 10px;
    color: var(--color-text-muted);
}

.usermenu__panel {
    position: absolute;
    inset-inline-end: 0;
    top: calc(100% + var(--space-2));
    z-index: 50;
    min-width: 220px;
    padding: var(--space-2);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.usermenu__panel[hidden] {
    display: none;
}

.usermenu__header {
    padding: var(--space-2) var(--space-3) var(--space-3);
    border-block-end: 1px solid var(--color-border);
    margin-block-end: var(--space-2);
}

.usermenu__header strong {
    display: block;
    font-size: var(--text-base);
}

.usermenu__header span {
    display: block;
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
}

.usermenu__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;
    padding: var(--space-2) var(--space-3);
    border: 0;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-text);
    font: inherit;
    text-align: start;
    text-decoration: none;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.usermenu__item:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
    text-decoration: none;
}

.usermenu__item--danger {
    color: var(--danger-600);
}

.usermenu__item i {
    width: 16px;
    text-align: center;
    color: var(--color-text-muted);
}

.usermenu__item--danger i {
    color: inherit;
}

/* ---- Content ------------------------------------------------------------ */

.content {
    flex: 1;
    width: 100%;
    max-width: var(--content-max);
    margin-inline: auto;
    padding: var(--space-6) var(--space-5) var(--space-10);
}

.page-header {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-4);
    margin-block-end: var(--space-6);
}

.page-header__text {
    min-width: 0;
}

.page-header__title {
    font-size: var(--text-xl);
    font-weight: var(--weight-semibold);
}

.page-header__description {
    margin-block-start: var(--space-1);
    font-size: var(--text-base);
    color: var(--color-text-secondary);
}

.page-header__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
    margin: 0 0 var(--space-3);
    padding: 0;
    list-style: none;
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.breadcrumb li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.breadcrumb li + li::before {
    content: '/';
    color: var(--color-border-strong);
}

.breadcrumb a {
    color: var(--color-text-muted);
}

.breadcrumb a:hover {
    color: var(--color-primary);
}

.breadcrumb [aria-current='page'] {
    color: var(--color-text-secondary);
    font-weight: var(--weight-medium);
}

/* ---- Grid --------------------------------------------------------------- */

.grid {
    display: grid;
    gap: var(--space-5);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 1200px) {
    .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
    .grid--2,
    .grid--3 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
    .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---- Responsive shell --------------------------------------------------- */

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

    [dir='rtl'] .sidebar {
        transform: translateX(100%);
    }

    .app.is-open .sidebar {
        transform: translateX(0);
    }

    .app.is-open .sidebar-backdrop {
        opacity: 1;
        visibility: visible;
    }

    .main {
        margin-inline-start: 0;
    }

    .content {
        padding: var(--space-5) var(--space-4) var(--space-8);
    }

    .topbar {
        padding-inline: var(--space-4);
    }
}

@media (max-width: 640px) {
    .content {
        padding: var(--space-4) var(--space-3) var(--space-8);
    }

    .usermenu__name {
        display: none;
    }

    .page-header {
        align-items: flex-start;
    }
}

/* ---- Print -------------------------------------------------------------- */

@media print {
    .sidebar,
    .topbar,
    .sidebar-backdrop,
    .no-print,
    .toast-stack {
        display: none !important;
    }

    .main {
        margin: 0;
    }

    .content {
        padding: 0;
        max-width: none;
    }

    .card {
        border: 0;
        box-shadow: none;
    }
}