/* =====================================================
   EcoWestern DevDocs — Sidebar Styles
   ===================================================== */

.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    height: 100%;
    background: var(--bg-surface);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform var(--duration-normal) var(--ease-out),
                width var(--duration-normal) var(--ease-out);
    z-index: 50;
}

.sidebar-nav {
    flex: 1;
    min-height: 0; /* required for flex child to scroll */
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--space-4) var(--space-3);
}

/* --- Section Title (filtered view) --- */
.sidebar-section-title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-3) var(--space-2);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-tertiary);
}

/* --- Category Group --- */
.sidebar-category {
    margin-bottom: var(--space-2);
    animation: fadeInUp var(--duration-normal) var(--ease-out) both;
}
.sidebar-category:nth-child(2) { animation-delay: 40ms; }
.sidebar-category:nth-child(3) { animation-delay: 80ms; }
.sidebar-category:nth-child(4) { animation-delay: 120ms; }
.sidebar-category:nth-child(5) { animation-delay: 160ms; }

.category-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    cursor: pointer;
    width: 100%;
    text-align: left;
    transition: all var(--duration-fast) var(--ease-out);
}
.category-header:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}
.category-icon {
    font-size: 0.9rem;
    line-height: 1;
}
.category-chevron {
    margin-left: auto;
    transition: transform var(--duration-fast) var(--ease-out);
    color: var(--text-tertiary);
    flex-shrink: 0;
}
.category-header.collapsed .category-chevron {
    transform: rotate(-90deg);
}

.category-items {
    overflow: hidden;
    transition: max-height var(--duration-normal) var(--ease-out),
                opacity var(--duration-fast) var(--ease-out);
    max-height: 4000px;
    opacity: 1;
}
.category-items.collapsed {
    max-height: 0;
    opacity: 0;
}

/* --- Nav Item --- */
.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3) var(--space-2) var(--space-8);
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.855rem;
    font-weight: 450;
    cursor: pointer;
    width: 100%;
    text-align: left;
    position: relative;
    transition: all var(--duration-fast) var(--ease-out);
    text-decoration: none;
    line-height: 1.4;
    min-height: 36px;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    border-radius: var(--radius-full);
    background: var(--text-tertiary);
    transition: all var(--duration-fast) var(--ease-out);
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.nav-item:hover::before {
    background: var(--accent);
    transform: translateY(-50%) scale(1.3);
}

.nav-item.active {
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 550;
}
.nav-item.active::before {
    width: 4px;
    height: 18px;
    border-radius: 2px;
    background: var(--accent);
    transform: translateY(-50%);
}

.nav-item-icon {
    font-size: 0.85rem;
    line-height: 1;
    flex-shrink: 0;
}

/* --- Admin-only controls in sidebar --- */
.nav-item-actions {
    margin-left: auto;
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: opacity var(--duration-fast) var(--ease-out);
}
.nav-item:hover .nav-item-actions {
    opacity: 1;
}
.nav-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    padding: 0;
}
.nav-action-btn:hover {
    background: var(--bg-active);
    color: var(--text-primary);
}
.nav-action-btn.danger:hover {
    background: var(--danger-soft);
    color: var(--danger);
}

/* --- Add Doc Button --- */
.add-doc-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    margin: var(--space-3) var(--space-3) var(--space-2);
    padding: var(--space-3) var(--space-4);
    border: 1px dashed var(--border-default);
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    width: calc(100% - var(--space-6));
    transition: all var(--duration-fast) var(--ease-out);
}
.add-doc-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}
.add-doc-btn svg {
    flex-shrink: 0;
}

/* --- Sidebar Footer --- */
.sidebar-footer {
    padding: var(--space-3) var(--space-4);
    border-top: 1px solid var(--border-subtle);
}
.sidebar-footer-text {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.72rem;
    color: var(--text-tertiary);
}
.version {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    padding: 2px 6px;
    background: var(--bg-raised);
    border-radius: var(--radius-sm);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: var(--header-total);
        left: 0;
        bottom: 0;
        transform: translateX(-100%);
        box-shadow: var(--shadow-xl);
        z-index: 90;
    }
    .sidebar.open {
        transform: translateX(0);
    }
}