/* ============================================================
   Sidebar Navigation
   Modern collapsible sidebar with Bootstrap 5.
   Supports: dark/light mode, collapsed/expanded, mobile offcanvas.
   Uses brand CSS variables from branding.css.
   ============================================================ */

:root {
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 60px;
    --sidebar-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --sidebar-bg: var(--brand-surface-alt);
    --sidebar-border: var(--brand-border);
    --sidebar-link-hover: rgba(0, 0, 0, 0.05);
    --sidebar-section-color: var(--brand-text-muted);
    --sidebar-active-bg: var(--brand-glow);
    --sidebar-active-color: var(--brand-primary);
}

[data-bs-theme="dark"] {
    --sidebar-link-hover: rgba(255, 255, 255, 0.06);
}

/* ---- Sidebar Container ---- */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    overflow: hidden;
    transition: width var(--sidebar-transition);
    z-index: 1040;
    display: flex;
    flex-direction: column;
}

.sidebar-nav::-webkit-scrollbar {
    width: 4px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: var(--sidebar-border);
    border-radius: var(--brand-radius-sm);
}

/* ---- Brand Header ---- */
.sidebar-brand {
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--sidebar-border);
    min-height: 60px;
    flex-shrink: 0;
}

.sidebar-brand img {
    height: 28px;
    width: auto;
    flex-shrink: 0;
}

.sidebar-brand-text {
    font-weight: 600;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ---- Navigation ---- */
.sidebar-nav {
    padding: 0.5rem 0;
    flex: 1;
    list-style: none;
    margin: 0;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-section {
    padding: 0.75rem 1rem 0.25rem;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--sidebar-section-color);
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    color: inherit;
    text-decoration: none;
    font-size: 0.875rem;
    border-radius: var(--brand-radius-sm);
    margin: 1px 0.5rem;
    transition: all 0.15s ease;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-link:hover {
    background: var(--sidebar-link-hover);
    color: inherit;
    text-decoration: none;
}

.sidebar-link.active {
    background: var(--sidebar-active-bg);
    color: var(--sidebar-active-color);
    font-weight: 500;
}

.sidebar-link i {
    font-size: 1.1rem;
    width: 1.25rem;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-link .badge {
    margin-left: auto;
    font-size: 0.65rem;
}

.sidebar-link-text {
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Disabled / Paywalled links */
.sidebar-link.is-disabled {
    opacity: 0.45;
    pointer-events: none;
}

.sidebar-link.is-paywalled {
    opacity: 0.7;
}

.sidebar-divider {
    border-top: 1px solid var(--sidebar-border);
    margin: 0.5rem 1rem;
}

/* ---- Footer (user info + toggle) ---- */
.sidebar-footer {
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--sidebar-border);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-footer-text {
    font-size: 0.8rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

/* ---- Collapsed State ---- */
.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.sidebar.collapsed .sidebar-brand-text,
.sidebar.collapsed .sidebar-section,
.sidebar.collapsed .sidebar-link-text,
.sidebar.collapsed .sidebar-link .badge,
.sidebar.collapsed .sidebar-footer-text {
    display: none;
}

.sidebar.collapsed .sidebar-brand a {
    display: none !important;
}

.sidebar.collapsed .sidebar-brand {
    justify-content: center;
    min-height: auto;
    padding: 0.75rem;
}

.sidebar.collapsed .sidebar-nav {
    overflow-y: auto;
    overflow-x: visible;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.sidebar.collapsed .sidebar-nav::-webkit-scrollbar {
    display: none;
}

/* ---- Hover Tooltip for collapsed icons ---- */
.sidebar.collapsed .sidebar-link {
    position: relative;
}

.sidebar-tooltip {
    position: fixed;
    background: var(--brand-card);
    color: var(--brand-text);
    padding: 0.35rem 0.65rem;
    border-radius: var(--brand-radius-sm);
    font-size: 0.8rem;
    white-space: nowrap;
    pointer-events: none;
    z-index: 1060;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
    opacity: 0;
    transition: opacity 0.12s ease;
    border: 1px solid var(--brand-border);
}

.sidebar-tooltip.show {
    opacity: 1;
}

.sidebar.collapsed .sidebar-link {
    justify-content: center;
    padding: 0.5rem;
    margin: 1px 0.25rem;
}

.sidebar.collapsed .sidebar-link i {
    font-size: 1.25rem;
}

.sidebar.collapsed .sidebar-footer {
    flex-direction: column;
    align-items: center;
    padding: 0.5rem;
    gap: 0.25rem;
}

/* ---- Main Content Offset ---- */
.main-content-with-sidebar {
    margin-left: var(--sidebar-width);
    transition: margin-left var(--sidebar-transition);
    min-height: 100vh;
}

.sidebar.collapsed ~ .main-content-with-sidebar,
body.sidebar-collapsed .main-content-with-sidebar {
    margin-left: var(--sidebar-collapsed-width);
}

/* ---- Toggle Button ---- */
.sidebar-toggle {
    background: none;
    border: none;
    color: inherit;
    padding: 0.25rem;
    min-width: 2.75rem;
    min-height: 2.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: var(--brand-radius-sm);
    transition: background 0.15s;
    flex-shrink: 0;
}

.sidebar-toggle:hover {
    background: var(--sidebar-link-hover);
}

/* ---- Mobile: Offcanvas ---- */
@media (max-width: 991.98px) {
    .sidebar {
        transform: translateX(-100%);
        width: var(--sidebar-width) !important;
        box-shadow: 4px 0 15px rgba(0, 0, 0, 0.15);
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .sidebar-backdrop {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 1039;
        display: none;
    }

    .sidebar-backdrop.show {
        display: block;
    }

    .main-content-with-sidebar {
        margin-left: 0 !important;
    }
}

/* ---- Top Bar (mobile hamburger + branding) ---- */
.topbar-mobile {
    display: none;
    position: sticky;
    top: 0;
    z-index: 1030;
    padding: 0.75rem 1rem;
    background: var(--sidebar-bg);
    border-bottom: 1px solid var(--sidebar-border);
    align-items: center;
    gap: 0.75rem;
}

@media (max-width: 991.98px) {
    .topbar-mobile {
        display: flex;
    }
}