/* ============================================================
   BackupSphere Responsive Sidebar
   Desktop: full | Tablet: collapsed | Mobile: off-canvas
   ============================================================ */

/* ── Sidebar shell ── */
.sidebar {
    width: var(--sidebar-width);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    background: linear-gradient(180deg, var(--sidebar-bg) 0%, var(--sidebar-bg-2) 100%);
    z-index: 1040;
    display: flex;
    flex-direction: column;
    transition: width var(--transition-slow), transform var(--transition-slow);
    overflow: hidden;
}

/* ── Sidebar brand ── */
.sidebar-brand {
    color: #fff;
    font-size: 1.15rem;
    font-weight: 600;
    padding: 1.25rem 1.25rem 1rem;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    white-space: nowrap;
    flex-shrink: 0;
}
.sidebar-brand:hover { color: #fff; }
.sidebar-brand img {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}

/* ── Sidebar navigation ── */
.sidebar-nav {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    padding: 0.5rem 0.75rem;
}
.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-track { background: transparent; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 2px; }

.sidebar .nav-link {
    color: var(--sidebar-text);
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-pill);
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    white-space: nowrap;
    border-left: 3px solid transparent;
}
.sidebar .nav-link:hover {
    color: var(--sidebar-text-hover);
    background: var(--sidebar-active-bg);
}
.sidebar .nav-link.active {
    color: var(--sidebar-text-hover);
    background: var(--sidebar-active-bg);
    border-left-color: var(--bs-brand-cyan);
}
.sidebar .nav-link i {
    width: 20px;
    text-align: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

/* ── Section dividers ── */
.sidebar-section {
    border-top: 1px solid var(--sidebar-divider);
    margin-top: 0.75rem;
    padding-top: 0.75rem;
}
.sidebar-section-label {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    user-select: none;
    white-space: nowrap;
}

/* ── Sidebar bottom (pinned settings) ── */
.sidebar-bottom {
    margin-top: auto;
    flex-shrink: 0;
    padding-bottom: 0.5rem;
}

/* ── Main content ── */
.main-content {
    margin-left: var(--sidebar-width);
    padding: 1.5rem 2rem;
    min-height: 100vh;
    transition: margin-left var(--transition-slow);
}

/* ── Hamburger toggle ── */
.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.25rem;
    line-height: 1;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}
.sidebar-toggle:hover {
    background: var(--surface-overlay);
}

/* ── Sidebar overlay (mobile) ── */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1035;
    opacity: 0;
    transition: opacity var(--transition-slow);
}

/* ── Tablet: collapsed sidebar ── */
@media (max-width: 991.98px) and (min-width: 768px) {
    .sidebar {
        width: var(--sidebar-collapsed-width);
    }
    .sidebar .nav-link span,
    .sidebar-brand span,
    .sidebar-section-label span {
        display: none;
    }
    .sidebar .nav-link {
        justify-content: center;
        padding: 0.65rem;
        border-left: none;
    }
    .sidebar .nav-link i {
        margin: 0;
        font-size: 1.2rem;
    }
    .sidebar-brand {
        justify-content: center;
        padding: 1.25rem 0.5rem 1rem;
    }
    .sidebar-section-label {
        justify-content: center;
        padding: 0.5rem;
    }
    .sidebar-section-label i {
        display: block;
    }
    .main-content {
        margin-left: var(--sidebar-collapsed-width);
    }
}

/* ── Mobile: off-canvas drawer ── */
@media (max-width: 767.98px) {
    .sidebar {
        transform: translateX(-100%);
        width: var(--sidebar-width);
    }
    .sidebar-open .sidebar {
        transform: translateX(0);
    }
    .sidebar-open .sidebar-overlay {
        display: block;
        opacity: 1;
    }
    .sidebar-toggle {
        display: block;
    }
    .main-content {
        margin-left: 0;
        padding: 1rem;
    }
    .topbar {
        padding: 0.75rem 1rem;
    }
}

/* ── Admin sidebar extras ── */
.sidebar.admin-sidebar .nav-link.active {
    border-left-color: var(--admin-accent, #ef4444);
}