/* =================================================================
 * CONTEXT & SESSION HISTORY WINDOWS
 * ================================================================= */

/* --- Modal Overlay (Background) --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.hidden {
    display: none;
}

/* --- Context Window Panel (The actual window) --- */
.context-window-panel {
    position: relative;
    width: 98%;
    max-width: 1100px;
    height: 85vh;
    max-height: 700px;
    background: var(--window-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px var(--shadow-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* --- Main Context Window (Legacy - keeping for compatibility) --- */
.context-window {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 98%;
    max-width: 1100px;
    height: 90vh;
    background: var(--window-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px var(--shadow-color);
    z-index: var(--z-context-window);
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.context-header {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--elevated-bg);
    transition: all 0.3s ease;
}

.context-header.hidden-for-detail {
    display: none;
}

.context-header .header-left {
    display: flex;
    align-items: center;
    gap: 6px;
}

.context-header .header-right {
    display: flex;
    align-items: center;
    gap: 4px;
}

.context-header h2 {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-color);
}

.sync-context-btn {
    display: none !important;
}

.close-context-btn {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 5px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    font-size: 0.9rem;
}

.close-context-btn:hover {
    background: var(--hover-bg);
    color: var(--accent-color);
}

.context-content {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    position: relative;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
    /* Smooth scroll anchoring */
    overflow-anchor: auto;
}

.context-content::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

/* --- List and Detail Views --- */
#context-list-view {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 8px;
}

#context-list-view.hidden {
    display: none;
}

#context-detail-view {
    display: block;
    height: 100%;
    overflow-y: auto;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
}

#context-detail-view::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

#context-detail-view.hidden {
    display: none;
}

/* --- Session List View --- */
.session-item {
    background: var(--elevated-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    padding: 10px 12px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    min-height: 44px;
}

.session-item:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
    background: var(--hover-bg);
}

.dark-mode .session-item:hover {
    border-color: var(--neutral-700);
    background: var(--neutral-800);
}
.session-content {
    flex-grow: 1;
    cursor: pointer;
    overflow: hidden;
}

.session-content h3 {
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.9rem;
    margin: 0;
    transition: color 0.2s ease;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
}

.session-meta {
    display: none;
}

/* --- Session Selection Controls --- */
.selection-controls {
    grid-column: 1 / -1;
    padding: 6px 10px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 8px;
}

.selection-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.selection-actions.hidden {
    display: none;
}

.selected-count {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.use-selected-btn,
.clear-selection-btn {
    padding: 5px 10px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.use-selected-btn {
    background: var(--accent-color);
    color: white;
}

.clear-selection-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
}

.use-selected-btn:hover {
    background: var(--accent-hover);
}

.clear-selection-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}

.session-select {
    padding-top: 1px;
}

.session-checkbox {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.custom-checkbox {
    position: relative;
    display: inline-block;
    width: 18px;
    height: 18px;
    background-color: var(--window-bg);
    border: 2px solid var(--border-color);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.custom-checkbox::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    font-size: 12px;
    font-weight: bold;
    color: white;
    transition: all 0.2s ease;
}

.session-item:hover .custom-checkbox {
    border-color: var(--accent-color);
}

.session-checkbox:checked + .custom-checkbox {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.session-checkbox:checked + .custom-checkbox::after {
    transform: translate(-50%, -50%) scale(1);
}

/* Legacy support for old checkbox-label class */
.checkbox-label {
    position: relative;
    display: inline-block;
    width: 20px;
    height: 20px;
    background-color: var(--window-bg);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.checkbox-label i.fa-check {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    font-size: 12px;
    color: white;
    transition: all 0.2s ease;
}

.session-item:hover .checkbox-label {
    border-color: var(--accent-color);
}

.session-checkbox:checked + .checkbox-label {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.session-checkbox:checked + .checkbox-label i.fa-check {
    transform: translate(-50%, -50%) scale(1);
}

.session-item.selected {
    border-color: var(--accent-color);
    background-color: var(--accent-muted);
}

.dark-mode .session-item.selected {
    background-color: rgba(60, 80, 220, 0.15);
    border-color: var(--primary-700);
}

/* --- Session Detail View (Unified History) --- */
.session-details-view .conversation-messages {
    background-color: transparent;
    border: none;
    border-radius: 0;
    padding: 16px 24px;
    box-shadow: none;
}

/* =================================================================
 * UNIFIED CONTEXT/FILE VIEWER (POPUP)
 * ================================================================= */

.selected-context-viewer {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    width: 98%;
    max-width: 700px;
    height: 85vh;
    background: var(--window-bg);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-xl);
    transition: transform 0.3s ease, opacity 0.3s ease;
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    z-index: var(--z-selected-context-viewer);
}

.selected-context-viewer.visible {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
    visibility: visible;
}

.context-viewer-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.context-viewer-header h3 {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-color);
    margin: 0;
}

.context-viewer-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--elevated-bg);
}

.viewer-tab {
    flex: 1;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    font-weight: 500;
}

.viewer-tab:hover {
    color: var(--text-color);
    background: var(--hover-bg);
}

.viewer-tab.active {
    color: var(--accent-color);
    background: var(--accent-muted);
    border-bottom: 2px solid var(--accent-color);
}

.viewer-tab i {
    font-size: 0.9rem;
}

.context-viewer-content {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.tab-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: none;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
    /* Smooth scroll anchoring */
    overflow-anchor: auto;
}

.tab-content::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.tab-content.active {
    display: block;
}

.context-preview-content,
.files-preview-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.close-viewer-btn {
    background: none;
    border: none;
    color: var(--icon-color);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-size: 1rem;
}

.close-viewer-btn:hover {
    color: var(--accent-color);
    background: var(--hover-bg);
}

/* Session Header for Detail View - Hidden, replaced by inline back button */
.session-header {
    display: none;
}

.back-button {
    background: none;
    border: none;
    color: var(--icon-color);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    width: 32px;
    height: 32px;
}

.back-button:hover {
    color: var(--accent-color);
    background: var(--hover-bg);
}

.back-button i {
    font-size: 1rem;
}

.back-button span {
    display: none;
}

.session-header h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 500;
}

/* --- Empty States and Loading --- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 16px;
    text-align: center;
    color: var(--text-secondary);
    grid-column: 1 / -1;
}

.empty-state i {
    font-size: 2.5rem;
    margin-bottom: 12px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.95rem;
    line-height: 1.4;
    margin: 0;
}

.empty-state.error-state {
    color: var(--error-500);
}

.empty-state.error-state i {
    color: var(--error-500);
}

.retry-load-btn {
    margin-top: 12px;
    padding: 8px 16px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
}

.retry-load-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.error-hint {
    margin-top: 10px;
    font-size: 0.8rem;
    opacity: 0.7;
}

.session-item-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px 16px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    grid-column: 1 / -1;
}

.loading-more-indicator {
    grid-column: 1 / -1;
    padding: 16px;
    text-align: center;
}

.loading-more-indicator .session-item-loading {
    padding: 16px;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* --- Conversation History in Detail View --- */
.conversation-history {
    flex: 1;
    overflow-y: auto;
    padding: 0;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
    /* Smooth scroll anchoring */
    overflow-anchor: auto;
}

.conversation-history::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.conversation-messages {
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

/* Inline header with back button and title */
.conversation-inline-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 16px;
    background: transparent;
}

.conversation-inline-header .back-button {
    flex-shrink: 0;
}

.conversation-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-color);
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-messages .message {
    padding: 0;
    border-radius: 0;
    line-height: 1.6;
    font-size: 0.95rem;
    background: transparent !important;
    border: none !important;
    max-width: 100%;
    margin: 0;
}

.conversation-messages .user-message {
    color: var(--text-color);
    text-align: left;
}

.conversation-messages .bot-message {
    color: var(--text-secondary);
    text-align: left;
}