/* Navigation Sidebar CSS - Left sidebar for navigation
   Tab visibility: three independent hide mechanisms
   .hidden = not yet unlocked (managed by UIHelpers)
   .group-collapsed = group collapsed by user
   .user-hidden = explicitly hidden via config modal */

.nav-sidebar {
    width: 160px;
    min-width: 160px;
    height: 100vh;
    background: rgba(26, 26, 46, 0.98);
    border-right: 2px solid #4ecdc4;
    overflow-y: auto;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 10px;
}

.nav-sidebar .tabs-group-label {
    font-size: 0.7em;
    color: #4ecdc4;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 8px 0 4px 8px;
    margin-top: 8px;
    opacity: 0.8;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    user-select: none;
    transition: opacity 0.2s;
}

.nav-sidebar .tabs-group-label:hover {
    opacity: 1;
}

.nav-sidebar .tabs-group-label:first-child {
    margin-top: 0;
}

.nav-sidebar .tabs-group-label .group-arrow {
    font-size: 0.8em;
    transition: transform 0.2s;
}

.nav-sidebar .tabs-group-label.collapsed .group-arrow {
    transform: rotate(0deg);
}

/* Nav sidebar tab buttons */
.nav-sidebar .tab {
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: none;
    color: #eee;
    cursor: pointer;
    border-radius: 6px;
    font-size: 0.85em;
    transition: all 0.3s;
    text-align: left;
    width: 100%;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-sidebar .tab:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-sidebar .tab.active {
    background: #4ecdc4;
    color: #1a1a2e;
    font-weight: bold;
}

/* Override display:flex for hidden tabs (CSS specificity fix) */
.nav-sidebar .tab.hidden {
    display: none !important;
}

/* Hide group labels when all tabs in group are hidden */
.nav-sidebar .tabs-group-label.hidden {
    display: none !important;
}

/* Collapsed tabs */
.nav-sidebar .tab.group-collapsed {
    display: none;
}

.nav-sidebar .tab-icon {
    font-size: 1.1em;
    line-height: 1;
}

.nav-sidebar .tab-icon-img {
    width: 1.2em;
    height: 1.2em;
    object-fit: contain;
}

.nav-sidebar .tab-label {
    flex: 1;
}

/* Action buttons (like Rebirth) - styled differently from navigation tabs */
.nav-sidebar .tab.tab-action {
    background: rgba(155, 89, 182, 0.15);
    border-left: 3px solid #9b59b6;
}

.nav-sidebar .tab.tab-action:hover {
    background: rgba(155, 89, 182, 0.3);
}

/* Action buttons never get active state */
.nav-sidebar .tab.tab-action.active {
    background: rgba(155, 89, 182, 0.15);
    color: #eee;
    font-weight: normal;
}

/* User-hidden tabs */
.nav-sidebar .tab.user-hidden {
    display: none !important;
}

/* Sidebar config gear button */
.nav-sidebar .sidebar-config-btn {
    margin-top: auto;
    opacity: 0.5;
    background: transparent;
    font-size: 0.8em;
}

.nav-sidebar .sidebar-config-btn:hover {
    opacity: 0.9;
    background: rgba(255, 255, 255, 0.05);
}

/* ─── Sidebar Config Modal ─── */

.sidebar-config {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sidebar-config-toolbar {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 4px;
}

.sidebar-config-toolbar-btn {
    padding: 6px 12px;
    border: 1px solid #4ecdc4;
    border-radius: 6px;
    background: rgba(78, 205, 196, 0.15);
    color: #4ecdc4;
    cursor: pointer;
    font-size: 0.85em;
    transition: all 0.2s;
}

.sidebar-config-toolbar-btn:hover {
    background: rgba(78, 205, 196, 0.3);
}

.sidebar-config-reset-btn {
    border-color: #e74c3c;
    color: #e74c3c;
    background: rgba(231, 76, 60, 0.1);
}

.sidebar-config-reset-btn:hover {
    background: rgba(231, 76, 60, 0.25);
}

/* Group container */
.sidebar-config-group {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    overflow: hidden;
}

/* Group header */
.sidebar-config-group-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    background: rgba(78, 205, 196, 0.1);
    border-bottom: 1px solid rgba(78, 205, 196, 0.2);
    cursor: grab;
    user-select: none;
}

.sidebar-config-group-header.custom {
    background: rgba(155, 89, 182, 0.1);
    border-bottom-color: rgba(155, 89, 182, 0.2);
}

.sidebar-config-group-label {
    flex: 1;
    color: #4ecdc4;
    font-weight: bold;
    font-size: 0.9em;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Tab rows container */
.sidebar-config-tabs-container {
    min-height: 8px;
    padding: 4px 0;
}

/* Tab row */
.sidebar-config-tab-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px 6px 20px;
    cursor: grab;
    user-select: none;
    transition: background 0.15s;
}

.sidebar-config-tab-row:hover {
    background: rgba(255, 255, 255, 0.05);
}

.sidebar-config-tab-row.is-hidden {
    opacity: 0.4;
}

.sidebar-config-tab-icon {
    font-size: 1em;
    line-height: 1;
}

.sidebar-config-tab-icon-img {
    width: 1.1em;
    height: 1.1em;
    object-fit: contain;
}

.sidebar-config-tab-label {
    flex: 1;
    color: #eee;
    font-size: 0.9em;
}

.sidebar-config-locked {
    font-size: 0.8em;
    opacity: 0.6;
}

/* Drag handle */
.sidebar-config-drag-handle {
    color: #666;
    font-size: 1.1em;
    cursor: grab;
    line-height: 1;
}

/* Action buttons */
.sidebar-config-actions {
    display: flex;
    gap: 4px;
    margin-left: auto;
}

.sidebar-config-actions button {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    color: #aaa;
    cursor: pointer;
    padding: 2px 6px;
    font-size: 0.8em;
    transition: all 0.2s;
    line-height: 1.2;
}

.sidebar-config-actions button:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.3);
}

/* Empty group placeholder */
.sidebar-config-empty-group {
    text-align: center;
    color: #666;
    font-size: 0.8em;
    font-style: italic;
    padding: 12px;
}

/* Inline rename input */
.sidebar-config-rename-input {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid #4ecdc4;
    border-radius: 4px;
    color: #fff;
    padding: 2px 6px;
    font-size: 0.9em;
    flex: 1;
    min-width: 0;
    outline: none;
}

/* ─── Drag and Drop Visual Feedback ─── */

.sidebar-config-tab-row.dragging,
.sidebar-config-group-header.dragging {
    opacity: 0.4;
}

.sidebar-config-tabs-container.drag-over {
    background: rgba(78, 205, 196, 0.08);
    outline: 1px dashed rgba(78, 205, 196, 0.4);
    outline-offset: -1px;
}

.sidebar-config-tab-row.drop-indicator-above {
    box-shadow: 0 -2px 0 0 #4ecdc4;
}

.sidebar-config-tab-row.drop-indicator-below {
    box-shadow: 0 2px 0 0 #4ecdc4;
}

.sidebar-config-group.drop-indicator-above {
    box-shadow: 0 -2px 0 0 #4ecdc4;
}

.sidebar-config-group.drop-indicator-below {
    box-shadow: 0 2px 0 0 #4ecdc4;
}