/* =============================================
   SIDEBAR — Left navigation panel
   Supports expanded and collapsed states with
   smooth transitions and tooltip fallbacks.
   ============================================= */

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-navy);
    color: var(--color-gray-300);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: relative;
    z-index: 20;
    transition: width var(--transition-smooth);
    overflow: hidden;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

/* --- Header --- */
.sidebar-header {
    height: var(--topbar-height);
    padding: 0 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
    gap: 4px;
}

.sidebar-logo {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
    cursor: pointer;
    padding: 4px;
    position: relative;
}

.sidebar-logo:hover {
    background: rgba(255, 255, 255, 0.08);
}

.sidebar-logo svg {
    height: 24px;
    width: 24px;
    opacity: 0.9;
    transition: opacity var(--transition-fast);
}

/* Expand overlay: hidden on expanded sidebar, shown on collapsed logo hover */
.sidebar-expand-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.1);
}

.sidebar.collapsed .sidebar-logo:hover .sidebar-expand-overlay {
    opacity: 1;
}

.sidebar.collapsed .sidebar-logo:hover svg {
    opacity: 0;
}

/* Close/toggle button: show on header hover */
.sidebar-toggle-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gray-400);
    transition: all var(--transition-fast);
    flex-shrink: 0;
    opacity: 0;
}

.sidebar-header:hover .sidebar-toggle-btn {
    opacity: 1;
}

.sidebar-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-white);
}

/* When collapsed: hide close button, use expand overlay instead */
.sidebar.collapsed .sidebar-header {
    justify-content: center;
    padding: 0;
}

.sidebar.collapsed .sidebar-toggle-btn {
    display: none;
}

/* --- Action Buttons --- */
.sidebar-actions {
    padding: 8px 12px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex-shrink: 0;
}

.sidebar-action-btn {
    width: 100%;
    height: 38px;
    padding: 0 12px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-gray-300);
    transition: all var(--transition-fast);
    white-space: nowrap;
    overflow: hidden;
    flex-shrink: 0;
}

.sidebar-action-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-white);
}

.sidebar-action-btn svg {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
}

.sidebar-action-btn .btn-label {
    opacity: 1;
    transition: opacity var(--transition-fast);
}

/* --- Search Row: icon + inline input --- */
.sidebar-search-row {
    display: flex;
    align-items: center;
    gap: 0;
    position: relative;
}

.sidebar-search-row .sidebar-search-btn {
    flex-shrink: 0;
}

.sidebar-search-input {
    width: 0;
    opacity: 0;
    padding: 0;
    border: none;
    background: transparent;
    color: #ffffff;
    font-family: var(--font-sans);
    font-size: 13px;
    outline: none;
    height: 38px;
    transition: all 0.25s ease;
    pointer-events: none;
}

.sidebar-search-input::placeholder {
    color: var(--color-gray-500);
}

/* When search is active */
.sidebar-search-row.active {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
}

.sidebar-search-row.active .sidebar-search-btn {
    width: 38px;
    padding: 0;
    min-width: 0;
    justify-content: center;
    background: transparent;
}

.sidebar-search-row.active .sidebar-search-btn .btn-label {
    display: none;
}

.sidebar-search-row.active .sidebar-search-input {
    flex: 1;
    width: 100%;
    opacity: 1;
    padding: 0 12px 0 0;
    pointer-events: auto;
    border: none;
}

/* Collapsed action buttons */
.sidebar.collapsed .sidebar-actions {
    padding: 8px 0 12px;
    align-items: center;
}

.sidebar.collapsed .sidebar-action-btn {
    width: 38px;
    height: 38px;
    justify-content: center;
    padding: 0;
}

.sidebar.collapsed .sidebar-action-btn .btn-label {
    display: none;
}

/* Collapsed: search row */
.sidebar.collapsed .sidebar-search-row {
    width: 38px;
    justify-content: center;
}

.sidebar.collapsed .sidebar-search-input {
    display: none;
}

.sidebar.collapsed .sidebar-search-btn {
    width: 38px;
    justify-content: center;
    padding: 0;
}

/* Empty Search State */
.sidebar-empty-state {
    padding: 30px 20px;
    text-align: center;
    font-size: 13px;
    color: var(--color-gray-500);
    font-style: italic;
    animation: fadeIn 0.3s ease;
}

/* --- Chat History --- */
.sidebar-history {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 4px 12px;
    transition: opacity var(--transition-fast);
}

.sidebar.collapsed .sidebar-history {
    opacity: 0;
    pointer-events: none;
    overflow: hidden;
}

.history-group {
    margin-bottom: 20px;
}

.history-group-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-gray-500);
    padding: 0 12px 6px;
    font-weight: 600;
}

.history-item {
    display: block;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-gray-400);
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.history-item:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--color-white);
}

.history-item.active {
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-white);
}

/* --- User Profile --- */
.sidebar-footer {
    flex-shrink: 0;
    border-top: var(--border-sidebar);
    position: relative;
}

.user-profile-btn {
    width: 100%;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background var(--transition-fast);
    overflow: hidden;
}

.user-profile-btn:hover {
    background: rgba(255, 255, 255, 0.06);
}

.user-avatar {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    background: var(--color-orange);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-weight: 600;
    font-size: 13px;
    transition: transform var(--transition-fast);
}

.user-profile-btn:hover .user-avatar {
    transform: scale(1.05);
}

.user-details {
    flex: 1;
    min-width: 0;
    transition: opacity var(--transition-fast);
}

.user-name {
    color: var(--color-white);
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-plan {
    color: var(--color-gray-500);
    font-size: 11px;
}

.user-menu-dots {
    color: var(--color-gray-500);
    flex-shrink: 0;
    transition: opacity var(--transition-fast);
}

/* Collapsed user profile: center badge properly */
.sidebar.collapsed .user-details,
.sidebar.collapsed .user-menu-dots {
    display: none;
}

.sidebar.collapsed .user-profile-btn {
    justify-content: center;
    padding: 12px 0;
    gap: 0;
}

/* --- User Popover Menu --- */
.user-popover {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 12px;
    right: 12px;
    background: var(--color-navy-mid);
    border: var(--border-sidebar);
    border-radius: var(--radius-md);
    padding: 6px;
    box-shadow: var(--shadow-xl);
    opacity: 0;
    transform: translateY(8px) scale(0.97);
    pointer-events: none;
    transition: all var(--transition-normal);
    z-index: 30;
    min-width: 220px;
}

.user-popover.open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

/* When collapsed: widen and position from sidebar left */
.sidebar.collapsed .user-popover {
    left: 4px;
    right: auto;
    min-width: 240px;
}

.popover-header {
    padding: 10px 12px;
    border-bottom: var(--border-sidebar);
    margin-bottom: 4px;
}

.popover-user-name {
    color: var(--color-white);
    font-size: 14px;
    font-weight: 600;
}

.popover-user-email {
    color: var(--color-gray-500);
    font-size: 12px;
    margin-top: 2px;
}

.popover-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-gray-300);
    font-size: 13px;
    transition: all var(--transition-fast);
    cursor: pointer;
    position: relative;
}

.popover-item:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-white);
}

.popover-item svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    opacity: 0.7;
}

.popover-item .popover-arrow {
    margin-left: auto;
    opacity: 0.4;
}

.popover-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.06);
    margin: 4px 0;
}

.popover-item.danger {
    color: var(--color-gray-400);
}

.popover-item.danger:hover {
    color: var(--color-red);
}

/* --- Help Submenu --- */
.help-submenu {
    position: absolute;
    left: calc(100% + 8px);
    bottom: -30px;
    background: var(--color-navy-mid);
    border: var(--border-sidebar);
    border-radius: var(--radius-md);
    padding: 6px;
    min-width: 200px;
    box-shadow: var(--shadow-xl);
    opacity: 0;
    transform: translateX(-4px);
    pointer-events: none;
    transition: all var(--transition-fast);
    z-index: 31;
}

.popover-item:hover .help-submenu {
    opacity: 1;
    transform: translateX(0);
    pointer-events: auto;
}

.submenu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-gray-300);
    font-size: 13px;
    transition: all var(--transition-fast);
    cursor: pointer;
    white-space: nowrap;
}

.submenu-item:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-white);
}

.submenu-item svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    opacity: 0.7;
}