/* ============================================
   Model Comparison Page Styles
   ============================================ */

.comparison-page {
    background: var(--bg-body);
    min-height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
}

.comparison-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ============================================
   Header
   ============================================ */
.comparison-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.comparison-header .header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.comparison-header .back-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.comparison-header .back-link:hover {
    color: var(--accent-color);
}

.comparison-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 1.5rem;
    padding-left: 1.5rem;
    border-left: 1px solid var(--border-color);
}

.comparison-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.2s;
}

.comparison-nav .nav-link:hover {
    background: var(--bg-hover);
    color: var(--accent-color);
}

.comparison-header .header-center {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.comparison-header .header-center h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.comparison-header .header-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ============================================
   Auth Required
   ============================================ */
.auth-required {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    text-align: center;
    color: var(--text-secondary);
}

.auth-required i {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.auth-required h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.auth-required p {
    margin-bottom: 1.5rem;
}

/* ============================================
   Layout with Sidebar
   ============================================ */
.comparison-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1rem;
    flex: 1;
    min-height: 0;
}

/* Both sidebars visible */
.comparison-layout:has(.comparison-sidebar:not(.collapsed)):has(.sidebar-right:not(.collapsed)) {
    grid-template-columns: 280px 1fr 320px;
}

/* Only history visible, settings collapsed */
.comparison-layout:has(.comparison-sidebar:not(.collapsed)):has(.sidebar-right.collapsed) {
    grid-template-columns: 280px 1fr;
}

/* Only settings visible, history collapsed */
.comparison-layout:has(.comparison-sidebar.collapsed):has(.sidebar-right:not(.collapsed)) {
    grid-template-columns: 1fr 320px;
}

/* Both sidebars collapsed */
.comparison-layout:has(.comparison-sidebar.collapsed):has(.sidebar-right.collapsed) {
    grid-template-columns: 1fr;
}

/* Hide collapsed sidebars */
.comparison-layout .comparison-sidebar.collapsed,
.comparison-layout .sidebar-right.collapsed {
    display: none;
}

/* Backdrop overlay for mobile/tablet only */
.settings-backdrop {
    display: none;
}

/* Only show backdrop on mobile/tablet, not on desktop */
@media (max-width: 1024px) {
    .settings-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    .settings-backdrop.active {
        display: block;
    }
}

/* ============================================
   History Sidebar
   ============================================ */
.comparison-sidebar {
    width: 260px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    /* Constrain height to viewport minus header/padding for scrolling */
    max-height: calc(100vh - 140px);
    align-self: start;
    position: sticky;
    top: 1rem;
}

.comparison-sidebar .sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.comparison-sidebar .sidebar-header h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.comparison-sidebar .sidebar-header h3 i {
    color: var(--text-secondary);
}

.history-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.new-comparison-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: var(--accent-color);
    color: var(--accent-contrast);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.new-comparison-btn:hover {
    background: var(--accent-hover);
}

.icon-btn.small {
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.icon-btn.small:hover {
    background: var(--bg-hover);
    color: var(--accent-color);
}

/* Search History Bar */
.search-history-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-surface);
}

.search-history-bar input {
    flex: 1;
    padding: 0.375rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    background: var(--bg-body);
    color: var(--text-primary);
}

.search-history-bar input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.history-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    text-align: center;
    color: var(--text-muted);
}

.history-empty i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

.history-empty p {
    font-size: 0.8rem;
    margin: 0;
}

.history-item {
    padding: 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 0.25rem;
}

.history-item:hover {
    background: var(--bg-hover);
}

.history-item.active {
    background: var(--accent-color);
    color: var(--accent-contrast);
}

.history-item.active .history-item-models,
.history-item.active .history-item-time {
    color: rgba(31, 31, 31, 0.75);
}

.history-item-title {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item.active .history-item-title {
    color: var(--accent-contrast);
}

.history-item-models {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.history-item-time {
    font-size: 0.65rem;
    color: var(--text-muted);
}

.history-item-actions {
    display: none;
    gap: 0.25rem;
    margin-left: auto;
}

.history-item:hover .history-item-actions {
    display: flex;
}

.history-item.active .history-item-actions {
    display: flex;
}

.history-item-delete {
    width: 20px;
    height: 20px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    transition: all 0.2s;
}

.history-item-delete:hover {
    background: rgba(255, 0, 0, 0.1);
    color: var(--danger-color);
}

.history-item.active .history-item-delete {
    color: rgba(255, 255, 255, 0.7);
}

.history-item.active .history-item-delete:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.comparison-sidebar .sidebar-footer {
    padding: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.clear-history-btn {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-family: inherit;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.clear-history-btn:hover {
    background: rgba(255, 0, 0, 0.1);
    color: var(--danger-color);
}

/* ============================================
   Main Content
   ============================================ */
.comparison-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-width: 0;
}

/* ============================================
   Model Selectors
   ============================================ */
.model-selectors-container {
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.model-selectors {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    padding: 1rem;
}

.model-selector {
    flex: 1;
    max-width: 300px;
}

.model-selector label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.model-selector select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
}

.vs-indicator {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-muted);
    padding: 0 1rem;
}

/* ============================================
   Right Sidebar - Settings
   ============================================ */
.sidebar-right {
    width: 320px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all 0.3s ease;
}

.sidebar-right .sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-right .sidebar-header h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-right .sidebar-header h3 i {
    color: var(--text-secondary);
}

.sidebar-right .sidebar-content {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
}

/* Settings Panel (kept for backward compatibility if needed) */
.settings-panel {
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.settings-toggle {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.75rem 1rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.settings-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.settings-toggle span {
    flex: 1;
    text-align: left;
}

.settings-toggle .toggle-icon {
    transition: transform 0.2s;
}

.settings-panel.collapsed .settings-toggle .toggle-icon {
    transform: rotate(-90deg);
}

.settings-panel .settings-content {
    padding: 0 1rem 1rem 1rem;
    transition: max-height 0.3s ease, padding 0.3s ease, opacity 0.2s ease;
    max-height: 500px;
    opacity: 1;
}

.settings-panel.collapsed .settings-content {
    max-height: 0;
    padding: 0 1rem;
    opacity: 0;
    overflow: hidden;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    align-items: start;
}

.settings-grid .form-group {
    margin-bottom: 0;
}

.settings-grid .system-prompt-group {
    grid-column: 1 / -1;
}

.settings-grid .system-prompt-group textarea {
    resize: vertical;
    min-height: 60px;
}

/* ============================================
   Response Panels
   ============================================ */
.response-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    flex: 1;
    min-height: 300px;
}

.response-panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--bg-hover);
    border-bottom: 1px solid var(--border-color);
}

.panel-model-name {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.panel-content {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    min-height: 200px;
    max-height: 400px;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.panel-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--text-muted);
}

.panel-placeholder i {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    opacity: 0.5;
}

.panel-placeholder p {
    font-size: 0.875rem;
    max-width: 200px;
}

/* Loading State */
.panel-content.loading {
    display: flex;
    align-items: center;
    justify-content: center;
}

.panel-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
}

.panel-loading .spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Error State */
.panel-content.error {
    color: var(--danger-color);
}

.panel-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-align: center;
}

.panel-error i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

/* Response Content */
.panel-response {
    white-space: pre-wrap;
    word-break: break-word;
}

.panel-response pre {
    background: var(--bg-body);
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 0.5rem 0;
}

.panel-response code {
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.8rem;
}

/* Panel Footer */
.panel-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background: var(--bg-hover);
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
}

.panel-metrics {
    display: flex;
    gap: 1rem;
    color: var(--text-secondary);
}

.panel-metrics .metric {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.panel-metrics .metric i {
    font-size: 0.75rem;
}

.panel-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.action-btn:hover {
    background: var(--bg-surface);
    color: var(--text-primary);
}

/* Winner Highlight */
.response-panel.winner .panel-header {
    background: linear-gradient(90deg, rgba(30, 142, 62, 0.1), transparent);
}

.response-panel.winner .panel-model-name::after {
    content: ' (Faster)';
    color: var(--success-color);
    font-weight: 400;
    font-size: 0.75rem;
}

/* ============================================
   Input Area
   ============================================ */
.comparison-input-area {
    padding: 16px 20px;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1rem;
}

.comparison-input-area .input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 8px 12px;
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.comparison-input-area .input-wrapper:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--focus-ring);
}

.comparison-input-area textarea {
    flex: 1;
    border: none;
    background: none;
    resize: none;
    font-family: inherit;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-primary);
    padding: 0.5rem 0;
    max-height: 120px;
    outline: none;
}

.comparison-input-area textarea::placeholder {
    color: var(--text-muted);
}

.comparison-input-area .send-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--accent-color);
    color: var(--accent-contrast);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.comparison-input-area .send-btn:hover:not(:disabled) {
    background: var(--accent-hover);
}

.comparison-input-area .send-btn:disabled {
    background: var(--bg-hover);
    color: var(--text-muted);
    cursor: not-allowed;
}

.comparison-input-area .input-footer {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0.25rem 0;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.input-hint {
    font-style: italic;
}

/* ============================================
   Footer
   ============================================ */
.comparison-page .disclaimer {
    padding: 1rem 0;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1280px) {
    .comparison-layout {
        grid-template-columns: 250px 1fr;
    }

    .comparison-layout:has(.sidebar-right:not(.collapsed)) {
        grid-template-columns: 250px 1fr 300px;
    }

    .comparison-sidebar {
        width: 250px;
    }

    .sidebar-right {
        width: 300px;
    }
}

@media (max-width: 1024px) {
    .comparison-layout {
        grid-template-columns: 220px 1fr;
    }

    .comparison-sidebar {
        width: 220px;
    }

    /* Hide right sidebar on tablets, require manual open */
    .sidebar-right:not(.expanded) {
        display: none;
    }

    .sidebar-right.expanded {
        position: fixed;
        right: 0;
        top: 0;
        height: 100vh;
        z-index: 1000;
        box-shadow: -2px 0 8px rgba(0, 0, 0, 0.1);
    }
}

@media (max-width: 768px) {
    .comparison-layout {
        display: flex;
        flex-direction: column;
    }

    .comparison-sidebar {
        width: 100%;
        max-height: 200px;
    }

    .history-list {
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        gap: 0.5rem;
        padding: 0.5rem;
    }

    .history-item {
        flex-shrink: 0;
        width: 150px;
        margin-bottom: 0;
    }

    .comparison-header {
        flex-wrap: wrap;
        gap: 1rem;
    }

    .comparison-header .header-center {
        order: -1;
        width: 100%;
        justify-content: center;
    }

    .comparison-nav {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        margin-top: 0.5rem;
    }

    .model-selectors {
        flex-direction: column;
        gap: 1rem;
    }

    .model-selector {
        max-width: 100%;
        width: 100%;
    }

    .vs-indicator {
        padding: 0;
    }

    .response-panels {
        grid-template-columns: 1fr;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }

    /* Right sidebar as overlay on mobile */
    .sidebar-right {
        position: fixed;
        right: 0;
        top: 0;
        height: 100vh;
        width: 90%;
        max-width: 320px;
        z-index: 1000;
        box-shadow: -2px 0 8px rgba(0, 0, 0, 0.2);
    }
}

/* ============================================
   Dark Mode
   ============================================ */
[data-theme="dark"] .comparison-page {
    background: var(--bg-body);
}

/* ============================================
   Conversation Thread (Threaded View)
   ============================================ */
.conversation-thread {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    overflow-y: auto;
    padding: 0.5rem;
    min-height: 300px;
    max-height: calc(100vh - 400px);
}

.thread-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    text-align: center;
    color: var(--text-muted);
    padding: 3rem 1rem;
}

.thread-empty i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.4;
}

.thread-empty h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.5rem 0;
}

.thread-empty p {
    font-size: 0.875rem;
    max-width: 300px;
    margin: 0;
}

/* Individual Exchange (User Message + Model Responses) */
.thread-exchange {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.thread-exchange:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

/* User Message in Thread */
.exchange-user-message {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.625rem 0.875rem;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.exchange-user-message .user-avatar {
    width: 32px;
    height: 32px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-contrast);
    font-size: 0.875rem;
    flex-shrink: 0;
}

.exchange-user-message .user-content {
    flex: 1;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-break: break-word;
}

/* Copy to Input button for user messages */
.copy-to-input-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.5);
    border: none;
    color: white;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 12px;
    opacity: 0;
    transition: all 0.2s ease;
    pointer-events: none;
    z-index: 10;
}

.exchange-user-message:hover .copy-to-input-btn {
    opacity: 1;
    pointer-events: auto;
}

.copy-to-input-btn:hover {
    background: rgba(0, 0, 0, 0.7);
    transform: scale(1.05);
}

.copy-to-input-btn i {
    font-size: 12px;
}

[data-theme="dark"] .copy-to-input-btn {
    background: rgba(255, 255, 255, 0.15);
}

[data-theme="dark"] .copy-to-input-btn:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* File attachment in user message */
.exchange-file-attachment {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    margin-top: 4px;
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-primary);
}

.exchange-file-attachment i {
    color: var(--accent-color);
    font-size: 16px;
}

.exchange-file-attachment .file-name {
    font-weight: 500;
}

/* Model Responses Container (Side-by-Side) */
.exchange-responses {
    display: grid;
    gap: 1rem;
}

/* 2-column layout (default) */
.exchange-responses.two-columns {
    grid-template-columns: 1fr 1fr;
}

/* 3-column layout when model3 is active */
.exchange-responses.three-columns {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.75rem;  /* Slightly smaller gap for 3 columns */
}

/* Response Panel in Thread */
.exchange-responses .response-panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.exchange-responses .panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    background: var(--bg-hover);
    border-bottom: 1px solid var(--border-color);
}

.exchange-responses .panel-model-name {
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.exchange-responses .panel-model-name i {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.exchange-responses .panel-content {
    padding: 0.75rem;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-primary);
    max-height: 300px;
    overflow-y: auto;
}

.exchange-responses .panel-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    background: var(--bg-hover);
    border-top: 1px solid var(--border-color);
    font-size: 0.7rem;
}

.exchange-responses .panel-metrics {
    display: flex;
    gap: 0.75rem;
    color: var(--text-secondary);
}

.exchange-responses .panel-metrics .metric {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.exchange-responses .panel-actions {
    display: flex;
    gap: 0.25rem;
}

.exchange-responses .action-btn {
    width: 24px;
    height: 24px;
    font-size: 0.75rem;
}

/* Winner highlight in thread */
.exchange-responses .response-panel.winner .panel-header {
    background: linear-gradient(90deg, rgba(30, 142, 62, 0.15), var(--bg-hover));
}

.exchange-responses .response-panel.winner .panel-model-name::after {
    content: ' \2022 Faster';
    color: var(--success-color);
    font-weight: 400;
    font-size: 0.7rem;
}

/* Loading state in thread */
.exchange-responses .panel-content.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80px;
}

.exchange-responses .panel-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.exchange-responses .panel-loading .spinner {
    width: 24px;
    height: 24px;
    border-width: 2px;
}

/* Error state in thread */
.exchange-responses .panel-content.error {
    color: var(--danger-color);
}

.exchange-responses .panel-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-align: center;
    font-size: 0.8rem;
}

.exchange-responses .panel-error i {
    font-size: 1.5rem;
}

/* Optional badge for Model 3 */
.model-selector-optional .optional-badge {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* Info icon with tooltip for Model 3 */
.model-selector-optional .info-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: 0.25rem;
    color: var(--text-muted);
    cursor: help;
    position: relative;
}

.model-selector-optional .info-icon i {
    font-size: 0.75rem;
    transition: color 0.2s ease;
}

.model-selector-optional .info-icon:hover i {
    color: var(--accent-color);
}

/* Native tooltip styling via title attribute - browser handles display */

/* Responsive for thread */
/* Tablet: 3 columns -> 2 columns */
@media (max-width: 992px) {
    .exchange-responses.three-columns {
        grid-template-columns: 1fr 1fr;
    }
}

/* Mobile: All layouts -> 1 column */
@media (max-width: 768px) {
    .exchange-responses.two-columns,
    .exchange-responses.three-columns {
        grid-template-columns: 1fr;
    }

    .conversation-thread {
        max-height: none;
    }

    /* Model selectors stack on mobile */
    .model-selectors {
        flex-direction: column;
        gap: 0.75rem;
    }

    .model-selector {
        max-width: 100%;
    }

    .vs-indicator {
        display: none;
    }
}