:root {
    --bg-dark: #212121;
    --bg-sidebar: #171717;
    --bg-hover: #2f2f2f;
    --text-primary: #ececec;
    --text-secondary: #b4b4b4;
    --border-color: #424242;
    --input-bg: #2f2f2f;
    --accent: #6b6b6b;
    --modal-bg: #2d2d2d;

    /* Default Accent (Dark Gray) */
    --accent-color: #4a4a4a;
    --accent-text: #ffffff;
    /* Text color on accent background */

    /* Code Block Colors (Dark Mode Default) */
    --code-bg: #0d1117;
    --code-header-bg: #21262d;
    --code-text: #c9d1d9;
    --code-header-text: #8b949e;

    /* Mode Selector Defaults (Dark) */
    --mode-slider-bg: #ececec;
    --mode-slider-text: #212121;
}

/* Accent Color Classes - ULTRA MUTED for White Text Support */
.accent-purple {
    --accent-color: #5e546b;
    --accent-text: #ffffff;
}

.accent-green {
    --accent-color: #546b5d;
    --accent-text: #ffffff;
}

.accent-blue {
    --accent-color: #54637a;
    --accent-text: #ffffff;
}

.accent-yellow {
    --accent-color: #8f7d4e;
    --accent-text: #ffffff;
}

.accent-red {
    --accent-color: #8f5e5e;
    --accent-text: #ffffff;
}

/* Ensure message backgrounds use the variable */
.message-wrapper.user .message-content {
    background-color: var(--accent-color) !important;
}

.light-mode {
    --bg-dark: #f5f5f0;
    --bg-sidebar: #e8e8e3;
    --bg-hover: #dcdcd5;
    --text-primary: #1a1a1a;
    --text-secondary: #5a5a5a;
    --border-color: #d0d0c8;
    --input-bg: #ebebe6;
    --modal-bg: #f5f5f0;

    /* Default Accent in light mode (Dark Gray) */
    --accent-color: #4a4a4a;
    --accent-text: #f5f5f0;

    /* Mode Selector Overrides (Light) */
    --mode-slider-bg: #4a4a4a;
    --mode-slider-text: #f5f5f0;
}

/* Override Accents in Light Mode to keep same pastel tone but maybe adjust text contrast if needed */
body.light-mode.accent-purple {
    --accent-color: #c084fc;
    --accent-text: #f5f5f0;
}

body.light-mode.accent-green {
    --accent-color: #4ade80;
    --accent-text: #f5f5f0;
}

body.light-mode.accent-blue {
    --accent-color: #60a5fa;
    --accent-text: #f5f5f0;
}

body.light-mode.accent-yellow {
    --accent-color: #eab308;
    --accent-text: #f5f5f0;
}

body.light-mode.accent-red {
    --accent-color: #f87171;
    --accent-text: #f5f5f0;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    height: 100vh;
    width: 100vw;
    display: flex;
    overflow: auto;
}

.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    height: 100%;
    flex-shrink: 0;
    z-index: 200;
    transition: width 0.3s ease;
    /* Ensure sidebar is above input container */
}

.sidebar-header {
    padding: 20px 10px 10px 12px;
    /* Reduced side padding (was 20px) */
    border-bottom: none;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.logo-icon {
    font-size: 24px;
}

.logo-icon-img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

/* In light mode, invert to black */
body.light-mode .logo-icon-img {
    filter: invert(1);
}

.logo-text {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.new-chat-btn {
    width: calc(100% - 16px);
    /* Adjusted width */
    padding: 8px 12px;
    background-color: var(--accent-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--accent-text);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s ease;
    margin: 10px 8px;
    /* Reduced margin (was 10px 10px) */
    position: relative;
    z-index: 9999;
    pointer-events: auto !important;
}

.new-chat-btn:hover {
    background-color: var(--bg-hover);
    transform: translateY(-1px);
    border-color: var(--text-secondary);
}

.app-branding h2 {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-dark);
    overflow: hidden;
    /* Prevent main-content from scrolling, let children scroll */
    position: relative;
    /* Create positioning context for absolute children */
}

/* Minimal Active State - No Border */
.tool-btn.active,
.sidebar-btn.active {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
}

.tool-btn.active .icon,
.sidebar-btn.active .icon {
    color: var(--text-primary);
}



.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 0 8px;
    /* Reduced padding (was 0 10px) */
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.search-container {
    margin-top: 10px;
}

.search-input {
    width: 100%;
    background-color: var(--bg-hover);
    border: 1px solid transparent;
    border-radius: 20px;
    /* Match chat input rounded style */
    padding: 8px 12px;
    /* Adjust padding for rounded look */
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
}

.search-input:focus {
    border-color: var(--border-color);
}

.chat-history-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 600;
    padding: 8px 4px;
}

.chat-history-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-top: 8px;
}


.history-item {
    padding: 8px 36px 8px 10px;
    /* Add right padding for menu button */
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-primary);
    transition: all 0.2s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

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

.history-item.active {
    background-color: rgba(255, 255, 255, 0.1);
}

.history-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
    margin-right: 8px;
    /* Space for menu button */
    pointer-events: none;
    /* Prevent text from blocking clicks */
}

/* Chat Menu Button (...) - v2.3: No border-radius, hover only shows on parent hover */
.chat-menu-btn {
    position: absolute;
    right: 4px;
    /* Moved closer to edge */
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    opacity: 0;
    /* Hidden by default */
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    cursor: pointer;
    transition: opacity 0.2s ease;
    height: 28px;
    width: 28px;
    z-index: 10;
}

.history-item:hover .chat-menu-btn {
    opacity: 1;
    /* Show only on hover */
}

.chat-menu-btn.active {
    opacity: 1;
    /* Keep visible when menu is open */
}

.chat-menu-btn:hover {
    color: var(--text-primary);
    /* Only change color, no background or border */
}

/* Chat Menu Dropdown */
.chat-menu-dropdown {
    position: absolute;
    right: 10px;
    top: 35px;
    /* Below the item */
    background-color: var(--bg-sidebar);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    z-index: 9999;
    display: none;
    flex-direction: column;
    min-width: 140px;
    padding: 4px;
}

.chat-menu-dropdown.show {
    display: flex;
}

.chat-menu-item {
    padding: 8px 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    border-radius: 6px;
    transition: background 0.2s;
    text-align: left;
    background: transparent;
    border: none;
    width: 100%;
}

.chat-menu-item:hover {
    background-color: var(--bg-hover);
}

.chat-menu-item.delete {
    color: #ff6b6b;
}

.chat-menu-item.delete:hover {
    background-color: rgba(255, 107, 107, 0.1);
}

.chat-menu-icon {
    width: 16px;
    height: 16px;
    opacity: 0.8;
}




/* Tools Section */
.tools-section {
    margin-bottom: 16px;
    padding: 8px 0;
    border-top: none;
    border-bottom: none;
}

.section-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    /* text-transform: uppercase; Removed per user request */
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    padding: 0 4px;
}

.tool-btn {
    width: 100%;
    padding: 8px 10px;
    background-color: transparent;
    border: none;
    border-radius: 10px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 13px;
    text-align: left;
    transition: all 0.2s ease;
}

.tool-btn:hover {
    background-color: var(--bg-hover);
    transform: translateY(-1px);
    border-color: var(--text-secondary);
}

.tool-btn .icon {
    width: 20px;
    height: 20px;
}

.chat-history-section {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    display: flex;
    flex-direction: column;
}

.sidebar-footer {
    margin-top: auto;
    padding: 10px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar-btn {
    width: 100%;
    padding: 9px 12px;
    background-color: rgba(255, 255, 255, 0.03);
    border: none;
    border-radius: 10px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 13px;
    text-align: left;
    transition: all 0.2s ease;
}

.sidebar-btn:hover {
    background-color: var(--bg-hover);
}

.footer-actions {
    display: flex;
    gap: 6px;
    align-items: center;
}

.profile-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 12px;
    padding: 10px 12px !important;
}

.profile-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.profile-avatar svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.icon-btn {
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

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

.icon-btn svg {
    width: 20px;
    height: 20px;
}

.icon {
    width: 18px;
    height: 18px;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-dark);
    overflow-y: scroll;
    /* Scrollbar sempre visibile all'estremo destro */
    transition: margin-left 0.3s ease, width 0.3s ease, margin-right 0.3s ease;
}

/* Removed duplicate chat-header definition */

.mode-selector {
    display: none;
}

.mode-btn {
    padding: 8px 16px;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

.mode-btn:hover {
    background-color: var(--bg-hover);
}

.mode-btn.active {
    background-color: var(--text-primary);
    color: var(--bg-dark);
    border-color: var(--text-primary);
}

/* Light mode: use lighter background for active mode buttons */
body.light-mode .mode-btn.active {
    background-color: #d0d0d0;
    color: #4a4a4a;
    border-color: #d0d0d0;
}

.chat-menu {
    position: relative;
    justify-self: end;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    /* Force inner content to right */
    width: 100%;
    margin-right: -10px;
}

.menu-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: background-color 0.2s;
}

.menu-btn:hover {
    background-color: var(--bg-hover);
}

.chat-header {
    display: flex;
    justify-content: space-between;
    position: relative;
    /* Anchor for absolute search bar */
    align-items: center;
    padding: 10px 20px;
    background-color: var(--bg-dark);
    border-bottom: none;
    position: sticky;
    top: 0;
    z-index: 100;
    min-height: 64px;
}

body:not(.light-mode) .chat-header {
    background-color: var(--bg-dark);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 15px;
    z-index: 10;
    justify-self: start;
}


.sidebar-header {
    padding: 20px 15px;
    border-bottom: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

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

.toggle-icon {
    width: 20px;
    height: 20px;
}

/* Sidebar Collapsed State (Mini Sidebar) */
body.sidebar-collapsed .sidebar {
    width: 60px !important;
    min-width: 60px !important;
    transform: none !important;
}

body.sidebar-collapsed .logo-text,
body.sidebar-collapsed .tool-btn span,
body.sidebar-collapsed .sidebar-btn span,
body.sidebar-collapsed .chat-history-section,
body.sidebar-collapsed .sidebar-footer .footer-actions,
body.sidebar-collapsed .search-container,
body.sidebar-collapsed .chat-history-label,
body.sidebar-collapsed .chat-history-list {
    display: none !important;
}

body.sidebar-collapsed .sidebar-header {
    justify-content: center;
    align-items: center;
    padding: 15px 0;
    flex-direction: column;
    height: auto;
    gap: 0;
}

body.sidebar-collapsed .sidebar-toggle-btn {
    transform: rotate(180deg);
    margin: 0 auto;
    display: flex;
}

body.sidebar-collapsed .logo {
    display: none !important;
}

body.sidebar-collapsed .logo-icon-img {
    display: none !important;
}

body.sidebar-collapsed .tools-section {
    align-items: center;
    padding: 10px 0;
    gap: 5px;
}

body.sidebar-collapsed .tool-btn {
    justify-content: center;
    padding: 0;
    width: 44px;
    height: 44px;
    margin: 0 auto;
    border-radius: 8px;
    display: flex;
    align-items: center;
}

body.sidebar-collapsed .sidebar-footer {
    padding: 15px 0;
    justify-content: center;
    align-items: center;
    gap: 5px;
}

body.sidebar-collapsed .sidebar-btn.upload-btn {
    justify-content: center;
    padding: 0;
    width: 44px;
    height: 44px;
    margin: 0 auto;
    border-radius: 8px;
    display: flex;
    align-items: center;
}

body.sidebar-collapsed .sidebar-btn.upload-btn .icon {
    margin-right: 0;
}

/* Reset sidebar toggle button positioning for header */
body.sidebar-collapsed .sidebar-toggle-btn {
    transform: rotate(180deg);
    margin: 0 auto;
    display: flex;
}

.mode-selector-dropdown {
    position: relative;
}

.current-mode-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    /* Increased from 8px */
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    padding: 8px 18px;
    /* Increased from 8px 12px */
    border-radius: 8px;
    transition: background-color 0.2s;
    min-width: 170px;
    /* Added to give it more presence */
    white-space: nowrap;
    /* Prevent icon/text squeezing */
}

.current-mode-btn:hover {
    background-color: var(--bg-hover);
}

.mode-icon {
    font-size: 20px;
}

.chevron-icon {
    width: 16px;
    height: 16px;
    color: var(--text-secondary);
    transition: transform 0.2s;
}

.mode-selector-dropdown.active .chevron-icon {
    transform: rotate(180deg);
}

.mode-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 8px;
    background-color: var(--modal-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    width: 300px;
    padding: 6px;
    display: none;
    /* Hidden by default */
    z-index: 101;
}

.mode-selector-dropdown.active .mode-dropdown-menu {
    display: block;
}

.mode-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.mode-option:hover {
    background-color: var(--bg-hover);
}

.mode-option-icon {
    font-size: 24px;
    width: 32px;
    display: flex;
    justify-content: center;
}

.mode-option-info {
    flex: 1;
}

.mode-option-title {
    font-weight: 600;
    font-size: 15px;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.mode-option-desc {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.mode-option-check {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
    opacity: 0;
    /* Hidden by default */
}

.mode-option.selected .mode-option-check {
    opacity: 1;
}

/* Chat Menu (Three dots) */
.chat-menu {
    position: relative;
}

.menu-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: background-color 0.2s;
}

.menu-btn:hover {
    background-color: var(--bg-hover);
}

.chat-menu-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background-color: var(--modal-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    min-width: 180px;
    z-index: 100;
}

.chat-menu-dropdown button {
    width: 100%;
    padding: 12px 16px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 14px;
    text-align: left;
    cursor: pointer;
    transition: background-color 0.2s;
}

.chat-menu-dropdown button:first-child {
    border-radius: 8px 8px 0 0;
}

.chat-menu-dropdown button:last-child {
    border-radius: 0 0 8px 8px;
}

.chat-menu-dropdown button:hover {
    background-color: var(--bg-hover);
}

.chat-header-mobile {
    display: none;
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.welcome-message {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.logo-placeholder {
    width: 50px;
    height: 50px;
    background-color: var(--bg-sidebar);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-emoji {
    font-size: 30px;
}

.welcome-message h1 {
    font-size: 24px;
    font-weight: 600;
}

.chat-messages {
    flex: 1;
    width: 100%;
    max-width: 1050px;
    /* Exact width as requested */
    margin: 0 auto;
    padding: 20px 0;
    display: none;
    overflow-y: auto;
    /* Enable scrolling */
    height: 100%;
    /* Ensure it takes full height */
}

.chat-messages.active {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.message-wrapper {
    display: flex;
    width: 100%;
    padding: 0 20px;
    flex-direction: column;
}

.message-wrapper.user {
    align-items: flex-end;
}

.message-wrapper.bot {
    align-items: flex-start;
}

.message-inner {
    display: flex;
    flex-direction: column;
    max-width: 85%;
    /* Contain both bubble and actions */
    min-width: 0;
}

.message-wrapper.user .message-inner {
    align-items: flex-end;
}

.message-wrapper.bot .message-inner {
    align-items: flex-start;
}

.message-content {
    width: auto;
    /* Allow bubble to shrink-wrap content */
    max-width: 100%;
    /* But don't exceed container */
    padding: 10px 15px;
    border-radius: 12px;
    line-height: 1.6;
    font-size: 16px;
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: break-word;
}

.message-wrapper.user .message-content {
    background-color: var(--accent-color) !important;
    border: none !important;
    color: #ffffff;
    border-radius: 18px;
    padding: 10px 16px;
    width: auto !important;
    /* Force bubble to wrap content only */
    max-width: 100%;
}

/* ... existing code ... */

.send-btn {
    background-color: var(--accent-color);
    color: #ffffff;
    border-radius: 8px;
    padding: 6px;
    transition: background-color 0.2s, color 0.2s;
}

.message-wrapper.bot .message-content {
    background: transparent;
    color: var(--text-primary);
    padding-left: 0;
    width: 100%;
}

/* ... existing code ... */

.send-btn {
    background-color: var(--accent-color);
    color: var(--accent-text);
    border-radius: 8px;
    padding: 6px;
    transition: background-color 0.2s, color 0.2s;
}

.message-content p {
    margin-bottom: 16px;
}

.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4 {
    margin-top: 24px;
    margin-bottom: 12px;
    font-weight: 600;
}

.message-content ul,
.message-content ol {
    margin-bottom: 16px;
    padding-left: 20px;
}

.message-content a {
    color: var(--text-secondary);
    text-decoration: underline;
    text-decoration-color: rgba(255, 255, 255, 0.1);
    transition: color 0.2s;
}

.message-content a:hover {
    color: var(--text-primary);
}

.message-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 24px 0;
    opacity: 0.5;
}


.message-content li {
    margin-bottom: 8px;
}

.message-content p:last-child,
.message-content ul:last-child,
.message-content ol:last-child {
    margin-bottom: 0;
}

.message-content strong {
    font-weight: 600;
}

/* Integrated Header Search - Refined Toggle Design */
.header-search-wrapper {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    width: auto;
    min-width: 40px;
    max-width: 450px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 0 16px;
    z-index: 100;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    overflow: hidden;
}

.header-search-wrapper.collapsed {
    padding: 0 12px;
    background: transparent;
    border-color: transparent;
}

.header-search-wrapper.collapsed:hover {
    background: var(--bg-hover);
    border-color: var(--border-color);
}

.search-trigger {
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    opacity: 1;
    transition: opacity 0.2s;
}

.header-search-wrapper:not(.collapsed) .search-trigger {
    display: none;
}

.search-trigger-text {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.search-input-container {
    display: flex;
    align-items: center;
    width: 100%;
    gap: 12px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.header-search-wrapper:not(.collapsed) .search-input-container {
    opacity: 1;
    pointer-events: auto;
}

.header-search-wrapper:not(.collapsed) {
    width: 100%;
    background: var(--input-bg);
    border-color: var(--border-color);
}

.close-search-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.close-search-btn:hover {
    opacity: 1;
    color: #ff4444;
}

.search-icon {
    width: 18px;
    height: 18px;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.header-search-input {
    flex: 1;
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    border-radius: 0;
    color: var(--text-primary);
    font-size: 14px;
    padding: 0;
    outline: none !important;
    height: 100%;
    appearance: none;
    -webkit-appearance: none;
}

.search-result-count {
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
    min-width: 40px;
    text-align: right;
}

.highlight-search {
    background-color: rgba(255, 255, 0, 0.3);
    border-radius: 2px;
    outline: 1px solid rgba(255, 255, 0, 0.5);
}

/* Profile Modal Styles */
.profile-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.profile-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.profile-avatar-large {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--bg-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.profile-avatar-large svg {
    width: 50px;
    height: 50px;
    color: var(--text-secondary);
}

.profile-avatar-large img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.change-avatar-btn {
    padding: 8px 16px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.change-avatar-btn:hover {
    background: var(--bg-hover);
}

.profile-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-item label {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-size: 14px;
    color: var(--text-primary);
}

.profile-actions {
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.logout-btn {
    width: 100%;
    padding: 12px;
    background: transparent;
    border: 1px solid #ff4444;
    border-radius: 8px;
    color: #ff4444;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s;
}

.logout-btn:hover {
    background: rgba(255, 68, 68, 0.1);
}

.logout-btn svg {
    width: 18px;
    height: 18px;
}

body.dark-mode .highlight-search {
    background-color: rgba(255, 255, 0, 0.2);
    color: #fff;
}

.input-container {
    padding: 10px 20px 25px 20px !important;
    /* More bottom padding for disclaimer space */
    display: flex;
    justify-content: center;
    background-color: var(--bg-dark);
    position: sticky;
    bottom: 0;
    z-index: 10;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Welcome Mode override for Input Container */
.input-container.welcome-mode {
    position: relative !important;
    bottom: auto !important;
    background-color: transparent !important;
    margin-top: 20px;
    padding-bottom: 40px !important;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
    /* Ensure container spans full width */
}

.disclaimer {
    position: absolute !important;
    bottom: 8px !important;
    left: 0 !important;
    width: 100% !important;
    text-align: center;
    color: var(--text-secondary);
    font-size: 11px;
    z-index: 1000 !important;
    pointer-events: none;
    letter-spacing: 0.3px;
    opacity: 0.7;
}

/* Thicker Input Area */
/* Consolidated Input Area Styles */
/* Unified Input Area Styles */
/* Unified Input Area Styles - Ultra-Slim Version */
.chat-input-area {
    display: flex;
    align-items: center;
    /* Vertically center all items */
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 28px;
    padding: 6px 16px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    min-height: 48px;
}

/* Remove header border */
.chat-header {
    border-bottom: none !important;
}

.input-wrapper {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.attachment-preview-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 0 4px;
}

.attachment-card {
    position: relative;
    width: 60px;
    height: 60px;
    background-color: var(--bg-hover);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    animation: fadeIn 0.2s ease;
}

.attachment-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.attachment-card .file-icon {
    font-size: 24px;
}

.attachment-card .remove-btn {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 18px;
    height: 18px;
    background-color: rgba(0, 0, 0, 0.5);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: blur(4px);
    transition: background-color 0.2s;
    z-index: 2;
}

.attachment-card .remove-btn:hover {
    background-color: rgba(255, 0, 0, 0.7);
}

.attachment-card .file-name-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    font-size: 8px;
    padding: 2px 4px;
    background: rgba(0, 0, 0, 0.4);
    color: white;
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
}

.chat-input-area:focus-within {
    border-color: var(--border-color);
    /* Don't highlight differently than base border */
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    /* Keep shadow but no white border */
}

#chatInput:focus {
    outline: none !important;
}

.attach-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.attach-btn:hover {
    background-color: var(--bg-hover);
}

.send-btn {
    border: none;
    background-color: var(--accent-color);
    color: white;
    /* Always white for contrast on accent */
    border-radius: 50%;
    /* Circle */
    width: 40px;
    height: 40px;
    min-width: 40px;
    /* Enforce circle */
    min-height: 40px;
    /* Enforce circle */
    aspect-ratio: 1 / 1;
    /* Modern browser enforcement */
    padding: 0;
    /* Remove padding to center icon */
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    /* Bouncy hover */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.send-btn svg {
    width: 20px;
    height: 20px;
    pointer-events: none;
}

.send-btn:hover {
    transform: scale(1.08);
    /* Slight grow effect */
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
    opacity: 1;
}

.send-btn:active {
    transform: scale(0.95);
}

.send-btn:disabled {
    background-color: var(--bg-secondary);
    color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
    box-shadow: none;
}

.side-send-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
    /* Circle like main chat */
    width: 34px;
    height: 34px;
    min-width: 34px;
    min-height: 34px;
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    padding: 0;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
    flex-shrink: 0;
}

.side-send-btn:hover {
    transform: scale(1.1);
    opacity: 1;
}

.side-send-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    transform: none;
}

/* Permission Request Styles */
.permission-request {
    background: rgba(255, 165, 0, 0.1);
    border-left: 3px solid #ffa500;
    padding: 16px !important;
    border-radius: 12px;
}

.permission-btn {
    margin-top: 16px;
    padding: 12px 24px;
    background: var(--accent);
    border: none;
    border-radius: 24px;
    /* Rounded button as requested */
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.permission-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    opacity: 0.9;
}

.permission-btn:active {
    transform: translateY(0);
}

.permission-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.permission-btn svg {
    flex-shrink: 0;
}

#chatInput {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    padding: 8px 10px;
    /* Adjusted for textarea vertical centering */
    outline: none;
    height: 40px;
    /* Initial fixed height */
    max-height: 200px;
    /* Maximum growth limit */
    resize: none;
    /* Disable manual resize */
    overflow-y: hidden;
    /* Hide scrollbar until needed */
    font-family: inherit;
    line-height: 1.5;
}

.disclaimer {
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal {
    background-color: var(--modal-bg);
    border-radius: 12px;
    width: 400px;
    padding: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.modal-large {
    width: 550px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
}

.close-modal {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.setting-item:last-child {
    border-bottom: none;
}

/* --- NEW SETTINGS MODAL STYLES --- */
.modal-settings {
    width: 850px;
    max-width: 95%;
    height: 550px;
    max-height: 95vh;
    padding: 0 !important;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background-color: var(--modal-bg);
    /* Unified light gray */
}

.modal-settings .modal-header {
    padding: 40px 50px 10px 50px;
    border-bottom: none !important;
    margin-bottom: 0;
}

.settings-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.settings-sidebar {
    width: 280px;
    background-color: transparent;
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    padding: 10px 0;
    display: flex;
    flex-direction: column;
}

.settings-sidebar-item {
    padding: 12px 20px;
    /* Reduced padding, closer to left */
    margin: 4px 10px;
    /* Add margin for rounded hover effect */
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
    font-weight: 500;
    font-size: 15px;
    /* Slightly smaller font */
    border-radius: 8px;
    /* Rounded corners for background */
    border-left: none;
    /* Remove border highlight */
}

.settings-sidebar-item:hover {
    color: var(--text-primary);
}

.settings-sidebar-item.active {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.1);
    /* Background highlight instead of border */
    font-weight: 600;
}

.settings-main {
    flex: 1;
    padding: 10px 50px 50px 60px;
    overflow-y: auto;
    background-color: transparent;
}

.settings-tab-content {
    display: none;
}

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

.settings-section-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 32px;
    color: var(--text-primary);
}

/* --- THEME PREVIEWS --- */
.theme-previews-container {
    display: flex;
    gap: 50px;
    margin-top: 25px;
    width: 100%;
}

.theme-preview-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    cursor: pointer;
    flex: 1;
    max-width: 400px;
    /* Increased from 280px */
}

.theme-preview {
    width: 100%;
    aspect-ratio: 16 / 10;
    border-radius: 20px;
    border: 5px solid transparent;
    /* Even thicker border */
    padding: 20px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow: hidden;
    background-color: #2a2a2a;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.theme-preview-wrapper:hover .theme-preview {
    transform: translateY(-10px);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 255, 255, 0.15);
}

.theme-preview-wrapper.active .theme-preview {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 6px rgba(255, 255, 255, 0.05), 0 20px 45px rgba(0, 0, 0, 0.4);
}

/* ChatGPT-Style Code Blocks */
.message-text pre {
    background: transparent !important;
    margin: 0 !important;
    padding: 0 !important;
}

.code-block-container {
    background: var(--code-bg);
    border-radius: 6px;
    margin: 12px 0;
    overflow: hidden;
}

.code-block-header {
    background: var(--code-header-bg);
    padding: 8px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    color: var(--code-header-text);
}

.code-block-lang {
    font-weight: 500;
}

.copy-code-btn {
    background: transparent;
    border: none;
    color: var(--code-header-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    transition: color 0.2s;
}

.copy-code-btn:hover {
    color: var(--text-primary);
}

.message-text code {
    font-family: 'Consolas', 'Monaco', 'Andale Mono', 'Ubuntu Mono', monospace;
    font-size: 14px;
    line-height: 1.5;
}

/* Specific padding for the code content */
.code-block-container pre {
    padding: 16px !important;
    overflow-x: auto;
}

/* Highlight.js overrides to ensure consistency */
.hljs {
    background: transparent !important;
    color: var(--code-text) !important;
}

.preview-label {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.theme-preview-wrapper.active .preview-label {
    color: var(--text-primary);
    font-weight: 600;
    transform: scale(1.15);
}

/* Mini UI elements inside preview */
.preview-header {
    height: 16px;
    border-radius: 6px;
    width: 100%;
}

.preview-body {
    display: flex;
    flex: 1;
    gap: 10px;
}

.preview-sidebar {
    width: 25%;
    border-radius: 6px;
}

.preview-main {
    flex: 1;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.preview-line {
    height: 12px;
    border-radius: 5px;
    width: 85%;
}

.preview-line.short {
    width: 45%;
}

/* Dark Preview Colors */
.theme-preview.dark {
    background-color: #1a1a1a;
}

.theme-preview.dark .preview-header {
    background-color: #262626;
}

.theme-preview.dark .preview-sidebar {
    background-color: #111;
}

.theme-preview.dark .preview-main {
    background-color: #1a1a1a;
}

.theme-preview.dark .preview-line {
    background-color: #333;
}

/* Light Preview Colors */
.theme-preview.light {
    background-color: #f5f5f0;
    border: 1px solid #d0d0c8;
}

.theme-preview.light .preview-header {
    background-color: #e8e8e3;
}

.theme-preview.light .preview-sidebar {
    background-color: #e0e0d8;
}

.theme-preview.light .preview-main {
    background-color: #f5f5f0;
}

.theme-preview.light .preview-line {
    background-color: #d0d0c8;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 4px;
}

/* --- Unified Mode Selection UI --- */
.mode-selection {
    display: inline-flex;
    position: relative;
    background-color: var(--bg-sidebar);
    border-radius: 32px;
    padding: 4px;
    gap: 0;
    margin: 30px auto 0;
    width: auto;
    max-width: 100%;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    z-index: 10;
    /* Ensure high stacking */
}

.mode-card {
    position: relative;
    z-index: 1;
    background: transparent;
    border: none !important;
    border-radius: 28px;
    padding: 12px 24px;
    flex: 1;
    min-width: 130px;
    cursor: pointer;
    text-align: center;
    color: var(--text-primary);
    opacity: 0.6;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: none !important;
    white-space: nowrap;
}

.mode-card:hover {
    color: var(--text-primary);
}

.mode-card.selected,
.mode-card.selected h3,
.mode-card.selected .mode-icon {
    color: var(--mode-slider-text) !important;
    font-weight: 700;
    opacity: 1;
}

.mode-card.selected:hover h3 {
    color: var(--mode-slider-text) !important;
}

.mode-selection::before {
    content: '';
    position: absolute;
    top: 4px;
    left: 4px;
    height: calc(100% - 8px);
    width: calc(50% - 4px);
    background-color: var(--mode-slider-bg);
    border-radius: 26px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 0;
}

.mode-selection[data-active="study"]::before {
    transform: translateX(0);
}

.mode-selection[data-active="balanced"]::before {
    transform: translateX(100%);
}

.mode-description {
    margin-top: 15px;
    font-size: 14px;
    /* Increased for clarity */
    color: var(--text-primary);
    /* Use primary for better contrast */
    opacity: 0.9;
    min-height: 20px;
    text-align: center;
}

.mode-card .mode-icon {
    font-size: 18px;
}

.mode-card h3 {
    font-size: 15px;
    font-weight: 600;
    margin: 0;
    color: inherit;
}

.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background-color: var(--text-primary);
    color: var(--bg-dark);
    padding: 12px 24px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 500;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 2000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-4px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(4px);
    }
}

.upload-modal {
    width: 600px;
    max-width: 90%;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 20px;
    background-color: var(--bg-sidebar);
    position: relative;
    overflow: hidden;
}

.upload-area:hover {
    border-color: var(--text-primary);
    background-color: var(--bg-hover);
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

/* Minimal Progress Bar */
.upload-progress-container {
    margin-top: 20px;
    display: none;
    /* Hidden by default */
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.progress-bar-bg {
    width: 100%;
    height: 4px;
    background-color: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--text-primary);
    /* Minimal: white/black based on theme */
    width: 0%;
    border-radius: 2px;
    transition: width 0.3s ease;
}

.processing-state {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    font-size: 13px;
    color: var(--text-secondary);
    justify-content: center;
}

.processing-spinner {
    width: 14px;
    height: 14px;
    border: 2px solid var(--border-color);
    border-top-color: var(--text-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.file-list-section h3 {
    font-size: 16px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.file-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    background-color: var(--bg-sidebar);
}

.file-item {
    display: flex;
    align-items: center;
    padding: 8px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
    color: var(--text-primary);
}

.file-item:last-child {
    border-bottom: none;
}

.file-item-icon {
    width: 20px;
    height: 20px;
    margin-right: 10px;
    color: var(--text-secondary);
}

.file-item span {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.delete-file-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s;
}

.delete-file-btn:hover {
    color: #ff4444;
    background-color: rgba(255, 68, 68, 0.1);
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: 20px;
    font-style: italic;
}

.theme-toggle {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.theme-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked+.toggle-slider {
    background-color: var(--accent-color);
}

input:checked+.toggle-slider:before {
    transform: translateX(24px);
}

body.light-mode {
    --bg-dark: #f5f5f0;
    --bg-sidebar: #e8e8e3;
    --bg-hover: #dcdcd5;
    --text-primary: #4a4a4a;
    --text-secondary: #7a7a7a;
    --border-color: #d0d0c8;
    --input-bg: #ebebe6;
    --modal-bg: #f5f5f0;

    /* Code Block Colors (Light Mode) */
    --code-bg: #ffffff;
    --code-header-bg: #e1e1db;
    --code-text: #24292e;
    --code-header-text: #6a737d;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 6px;
    padding: 15px 20px;
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-secondary);
    animation: typing 1.4s infinite;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {

    0%,
    60%,
    100% {
        opacity: 0.3;
        transform: translateY(0);
    }

    30% {
        opacity: 1;
        transform: translateY(-8px);
    }
}

/* Consolidated Message Action Styles moved to bottom */

/* Chat Input Minimal Styling */
/* Consolidated chatInput styles moved above */
#chatInput:focus {
    outline: none;
    border: none;
}

/* Text Selection Highlight - Subtle gray like ChatGPT */
::selection {
    background-color: rgba(255, 255, 255, 0.08);
    color: inherit;
}

::-moz-selection {
    background-color: rgba(255, 255, 255, 0.08);
    color: inherit;
}

/* Text Selection Popup - Professional ChatGPT-style */
.text-selection-popup {
    position: fixed;
    z-index: 10000;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 6px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4),
        0 2px 8px rgba(0, 0, 0, 0.2);
    animation: popupFadeIn 0.15s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(12px);
}

.text-selection-popup button {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 13.5px;
    font-weight: 500;
    padding: 8px 14px;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

.text-selection-popup button:hover {
    background: var(--bg-hover);
    transform: scale(1.02);
}

.text-selection-popup button:active {
    transform: scale(0.98);
}

/* Elegant question mark icon */
/* CSS icon removed - using img tag instead */

@keyframes popupFadeIn {
    from {
        opacity: 0;
        transform: translateY(-8px) scale(0.96);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Side Chat Panel */
.side-chat-panel {
    position: fixed;
    right: 0;
    top: 0;
    width: 380px;
    height: 100vh;
    background: var(--bg-dark);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
    }

    to {
        transform: translateX(0);
    }
}

.side-chat-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.side-chat-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.close-side-chat {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 28px;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: all 0.2s;
}

.close-side-chat:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.side-chat-context {
    padding: 16px 20px;
    background: rgba(128, 128, 128, 0.1);
    border-bottom: 1px solid var(--border-color);
    border-left: 3px solid var(--accent);
}

.context-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.context-icon {
    width: 14px;
    height: 14px;
    opacity: 0.7;
}

.context-text {
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 600;
    font-style: italic;
    line-height: 1.5;
    max-height: 100px;
    overflow-y: auto;
}

.side-chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.side-message {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.side-message.user {
    align-items: flex-end;
}

.side-message-bubble {
    max-width: 85%;
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.5;
}

.side-message.user .side-message-bubble {
    background: var(--accent);
    color: white;
}

.side-message.bot .side-message-bubble {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* Side chat typing indicator - no background, smaller dots */
.side-message.bot .side-message-bubble:has(.typing-indicator) {
    background: transparent;
    padding: 0;
}

.side-message.bot .side-message-bubble .typing-indicator {
    background: transparent;
    padding: 0;
}

.side-message.bot .side-message-bubble .typing-dot {
    width: 6px;
    height: 6px;
}

.side-chat-input-area {
    display: flex;
    align-items: center;
    /* Centered text and button */
    background-color: var(--input-bg) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 28px !important;
    padding: 4px 14px !important;
    margin: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1) !important;
    transition: all 0.3s ease;
    gap: 8px;
    min-height: 42px;
}

.side-chat-input-area:focus-within {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15) !important;
}

#sideChatInput {
    flex: 1;
    background: transparent !important;
    border: none !important;
    padding: 8px 0;
    /* Better vertical centering */
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    height: 34px;
    /* Match button height for alignment */
    /* Slimmer initial height for side chat */
    max-height: 150px;
    resize: none;
    overflow-y: hidden;
    font-family: inherit;
    line-height: 1.4;
}

/* Side Send Button icon sizing */
.side-send-btn svg {
    width: 18px;
    height: 18px;
    pointer-events: none;
}

/* Adjust main content when side chat is open */
.main-content.side-chat-open {
    margin-right: 380px;
    transition: margin-right 0.3s ease;
}

/* Mind Map Generator Modal */
.mindmap-modal {
    max-width: 700px;
    width: 90%;
}

.mindmap-content {
    padding: 24px;
}

.mindmap-input-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mindmap-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: rgba(255, 255, 255, 0.02);
}

.mindmap-upload-area:hover {
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.05);
}

.mindmap-upload-area .upload-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    color: var(--text-secondary);
}

.upload-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.upload-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
}

.divider-text {
    text-align: center;
    position: relative;
    margin: 16px 0;
}

.divider-text::before,
.divider-text::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 45%;
    height: 1px;
    background: var(--border-color);
}

.divider-text::before {
    left: 0;
}

.divider-text::after {
    right: 0;
}

.divider-text span {
    background: var(--modal-bg);
    padding: 0 16px;
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mindmap-text-area {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mindmap-text-area label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.mindmap-text-area textarea {
    width: 100%;
    min-height: 150px;
    padding: 12px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
    outline: none;
    transition: border-color 0.2s;
}

.mindmap-text-area textarea:focus {
    border-color: var(--accent);
}

.mindmap-text-area textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.generate-mindmap-btn {
    width: 100%;
    padding: 14px;
    background: var(--accent);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: opacity 0.2s;
}

.generate-mindmap-btn:hover {
    opacity: 0.9;
}

.generate-mindmap-btn svg {
    width: 20px;
    height: 20px;
}

.mindmap-canvas {
    width: 100%;
    min-height: 400px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
}

.canvas-placeholder {
    text-align: center;
    color: var(--text-secondary);
    padding: 100px 20px;
    font-size: 14px;
}

/* --- CHAT VIEW LAYOUT RESTORATION --- */
#chatView {
    display: flex;
    flex-direction: column;
    flex: 1;
    position: relative;
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    /* Start from top to push title up */
    align-items: center;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    padding-top: 22vh;
    /* Shifted lower from 15vh for better spacing */
    padding-bottom: 140px;
}

.chat-container.compact-mode {
    flex: 0 1 auto !important;
    padding-bottom: 20px !important;
}

.welcome-message {
    text-align: center;
    width: 100%;
}

.welcome-message h1 {
    font-size: 24px;
    /* Reduced from 32px */
    margin-bottom: 24px;
}

.chat-messages {
    flex: 1;
    padding: 20px;
    padding-bottom: 120px;
    display: none;
    flex-direction: column;
    gap: 20px;
}

.chat-messages.active {
    display: flex;
}

/* Mode Selection Restoration */


/* Message Actions Restoration & Refinement */
.message-actions {
    display: flex;
    gap: 4px;
    margin-top: 8px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.message-wrapper:hover .message-actions {
    opacity: 1;
}

.message-wrapper.user .message-actions {
    justify-content: flex-end;
}

.action-btn {
    background: transparent;
    border: none;
    padding: 6px;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    width: 32px;
    height: 32px;
}

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

.action-btn svg {
    width: 16px;
    height: 16px;
    stroke-width: 2.5;
}

/* Settings Modal Styles Restoration */
.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
}

.setting-item:last-child {
    border-bottom: none;
}

.accent-picker {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

.accent-option {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
    padding: 0;
}

.accent-option:hover {
    transform: scale(1.1);
    border-color: var(--text-primary);
}

.accent-option.selected::after {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    border: 2px solid var(--text-primary);
    border-radius: 50%;
}

/* End of File Style Cleanup */

/* --- AI Personality Grid --- */
.personality-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 12px;
    width: 100%;
}

.personality-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 10px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.personality-card:hover {
    background-color: var(--bg-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-color: var(--text-secondary);
}

.personality-card.active {
    background-color: var(--bg-hover);
    border: 2px solid var(--text-primary);
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.05);
    /* Subtle depth */
}

/* Dark mode adjustment for active state if needed */
body.dark-mode .personality-card.active {
    background-color: rgba(255, 255, 255, 0.05);
}

.persona-icon {
    font-size: 24px;
    margin-bottom: 2px;
}

.persona-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.persona-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.persona-quote {
    font-size: 11px;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.2;
    opacity: 0.8;
}

.input-container {
    transition: bottom 0.4s cubic-bezier(0.19, 1, 0.22, 1), left 0.4s ease, width 0.4s ease;
}

/* --- Projects Feature Styles --- */

.project-item {
    padding-left: 12px;
}

.project-icon {
    font-size: 16px;
    margin-right: 8px;
    opacity: 0.8;
}

.project-count {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    margin-right: 24px;
    /* Space for menu btn */
}

/* New Project Modal */
.chat-selection-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-top: 10px;
    background: var(--bg-secondary);
}

.chat-selection-item {
    display: flex;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
}

.chat-selection-item:last-child {
    border-bottom: none;
}

.chat-selection-item:hover {
    background-color: var(--bg-hover);
}

.chat-select-checkbox {
    margin-right: 12px;
    width: 16px;
    height: 16px;
    accent-color: var(--accent-color);
}

.chat-select-info {
    flex: 1;
    overflow: hidden;
}

.chat-select-title {
    font-size: 14px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
}

.chat-select-date {
    font-size: 11px;
    color: var(--text-secondary);
}

/* Project View */
.project-view-container {
    display: none;
    height: 100%;
    overflow-y: auto;
    padding: 30px;
}

.project-header {
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

.project-title-area {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
}

.project-header-icon {
    font-size: 32px;
    margin-right: 16px;
}

.project-header h1 {
    font-size: 28px;
    font-weight: 700;
    margin: 0;
}

.project-meta {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.project-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.search-in-project input {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--text-primary);
    width: 250px;
}

/* Project Chats Grid */
.project-chats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.project-chat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    display: flex;
    /* Required for filter hiding */
    flex-direction: column;
}

.project-chat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-color: var(--accent-color);
}

.card-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.card-icon {
    font-size: 20px;
}

.card-date {
    font-size: 12px;
    color: var(--text-secondary);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 8px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-preview {
    font-size: 13px;
    color: var(--text-secondary);
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
}

.remove-from-project-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s;
    padding: 4px;
    border-radius: 4px;
}

.remove-from-project-btn:hover {
    background: rgba(255, 0, 0, 0.1);
    color: #ef4444;
}

.project-chat-card:hover .remove-from-project-btn {
    opacity: 1;
}

.empty-project-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-project-stats .empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}