/* ============================================
   CONFIGURABLE THEME - Edit these values to customize the app
   ============================================ */
:root {
    /* Fonts */
    --font-sourceserif: "Source Serif 4", ui-serif, 'New York', Georgia, serif;
    --font-librecaslon: "Libre Caslon Text", 'New York', Georgia, serif;
    --font-ptserif: 'PT Serif', 'New York', Georgia, serif;

    --font-sans: 'SF Pro Text', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --font-serif: var(--font-sourceserif);
    --font-mono: 'SF Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

    /* Blue palette */
    --blue-500: 217.2 91.2% 59.8%;
    --blue-600: 221.2 83.2% 53.3%;
    --blue-700: 224.3 76.3% 48%;

    /* Status indicator color (for active/online/connected states) */
    /* Original Tailwind green shades (kept for reference/switching):
       Solid: --green-400: #4ade80; --green-500: #22c55e; --green-600: #16a34a; --green-700: #15803d;
       Badge: bg-green-100 text-green-700 dark:bg-green-900/30 dark:text-green-400
       Previous custom: #5DA87F
    */
    --color-status-success: #498966;

    /* Accent color (active toggles, primary highlights) */
    --color-accent-primary: var(--blue-500);
    --color-accent-primary-foreground: 0 0% 100%;

    /* Frosted glass effect - adjust opacity (0-1) and blur (px) */
    --glass-opacity: 0.82;
    --glass-blur: 12px;
    --glass-opacity-hover: 0.92;

    /* Hover highlight background */
    --color-hover: 210 40% 96.1%;

    /* Slate color definitions */
    --slate-1: hsl(206, 30%, 98.8%);
    --slate-2: hsl(210, 16.7%, 97.6%);
    --slate-3: hsl(209, 13.3%, 95.3%);
    --slate-4: hsl(209, 12.2%, 93.2%);
    --slate-200: hsl(214.3, 31.8%, 91.4%);
    --slate-800: hsl(217.2, 32.6%, 17.5%);
    --slate-6: hsl(209, 9.0%, 82.5%);

    color-scheme: light;
    --color-background: 0 0% 100%;
    --color-foreground: 222.2 84% 4.9%;
    --color-card: 0 0% 100%;
    --color-card-foreground: 222.2 84% 4.9%;
    --color-popover: 0 0% 100%;
    --color-popover-foreground: 222.2 84% 4.9%;
    --color-primary: 222.2 47.4% 11.2%;
    --color-primary-foreground: 210 40% 98%;
    --color-secondary: 210 40% 96.1%;
    --color-secondary-foreground: 222.2 47.4% 11.2%;
    --color-muted: 210 40% 96.1%;
    --color-muted-foreground: 215.4 16.3% 46.9%;
    --color-accent: 210 40% 96.1%;
    --color-accent-foreground: 222.2 47.4% 11.2%;
    --color-destructive: 0 62.8% 30.6%;
    --color-destructive-foreground: 0 0% 95%;
    --color-border: 214.3 31.8% 91.4%;
    --color-input: 214.3 31.8% 91.4%;
    --color-ring: 222.2 84% 4.9%;
}

.dark {
    /* Frosted glass - slightly more opaque for dark mode readability */
    --glass-opacity: 0.78;
    --glass-blur: 14px;
    --glass-opacity-hover: 0.88;

    /* Hover highlight for dark mode */
    --color-hover: 0 0% 22%;

    /* Slate colors - neutral gray based */
    --slate-1: hsl(0, 0%, 10%);
    --slate-2: hsl(0, 0%, 13%);
    --slate-3: hsl(0, 0%, 16%);
    --slate-4: hsl(0, 0%, 19%);
    --slate-200: hsl(0, 0%, 22%);
    --slate-800: hsl(0, 0%, 85%);
    --slate-6: hsl(0, 0%, 30%);

    color-scheme: dark;
    /* Neutral gray background instead of blue-ish */
    --color-background: 0 0% 15%;           /* #262626 */
    --color-foreground: 0 0% 95%;           /* Near white */
    --color-card: 0 0% 12%;                 /* Slightly darker than bg */
    --color-card-foreground: 0 0% 95%;
    --color-popover: 0 0% 12%;
    --color-popover-foreground: 0 0% 95%;
    --color-primary: 0 0% 95%;
    --color-primary-foreground: 0 0% 12%;
    --color-secondary: 0 0% 20%;
    --color-secondary-foreground: 0 0% 95%;
    --color-muted: 0 0% 20%;
    --color-muted-foreground: 0 0% 65%;
    --color-accent: 0 0% 20%;
    --color-accent-foreground: 0 0% 95%;
    --color-destructive: 0 62.8% 30.6%;
    --color-destructive-foreground: 0 0% 95%;
    --color-border: 0 0% 25%;
    --color-input: 0 0% 25%;
    --color-ring: 0 0% 80%;
}

:root,
.dark {
    --tw-ring-offset-color: hsl(var(--color-background));
    --tw-ring-color: hsl(var(--color-ring));
}

/* Global font application */
body {
    font-family: var(--font-sans);
    /* Prevent layout collapse on very narrow screens */
    min-width: 320px;
    /* Disable all zoom gestures on mobile (double-tap and pinch) */
    touch-action: pan-x pan-y;
}

/* Ensure chat area can scroll with touch but no zoom */
#chat-area {
    touch-action: pan-y;
}

code, pre, kbd, .font-mono {
    font-family: var(--font-mono);
}

.bg-background {
    --tw-bg-opacity: 1;
    background-color: hsl(var(--color-background) / var(--tw-bg-opacity, 1)) !important;
}

.text-foreground {
    --tw-text-opacity: 1;
    color: hsl(var(--color-foreground) / var(--tw-text-opacity, 1)) !important;
}

.border-border {
    --tw-border-opacity: 1;
    border-color: hsl(var(--color-border) / var(--tw-border-opacity, 1)) !important;
}

.border-input {
    --tw-border-opacity: 1;
    border-color: hsl(var(--color-input) / var(--tw-border-opacity, 1)) !important;
}

.border-foreground {
    --tw-border-opacity: 1;
    border-color: hsl(var(--color-foreground) / var(--tw-border-opacity, 1)) !important;
}

.bg-secondary {
    --tw-bg-opacity: 1;
    background-color: hsl(var(--color-secondary) / var(--tw-bg-opacity, 1)) !important;
}

.text-secondary-foreground {
    --tw-text-opacity: 1;
    color: hsl(var(--color-secondary-foreground) / var(--tw-text-opacity, 1)) !important;
}

.bg-muted {
    --tw-bg-opacity: 1;
    background-color: hsl(var(--color-muted) / var(--tw-bg-opacity, 1)) !important;
}

.text-muted-foreground {
    --tw-text-opacity: 1;
    color: hsl(var(--color-muted-foreground) / var(--tw-text-opacity, 1)) !important;
}

/* Placeholder text color - ensures Tailwind placeholder:text-muted-foreground uses our variable */
.placeholder\:text-muted-foreground::placeholder,
::placeholder {
    color: hsl(var(--color-muted-foreground)) !important;
    opacity: 1;
}

.bg-accent {
    --tw-bg-opacity: 1;
    background-color: hsl(var(--color-accent) / var(--tw-bg-opacity, 1)) !important;
}

.text-accent-foreground {
    --tw-text-opacity: 1;
    color: hsl(var(--color-accent-foreground) / var(--tw-text-opacity, 1)) !important;
}

.bg-card {
    --tw-bg-opacity: 1;
    background-color: hsl(var(--color-card) / var(--tw-bg-opacity, 1)) !important;
}

.text-card-foreground {
    --tw-text-opacity: 1;
    color: hsl(var(--color-card-foreground) / var(--tw-text-opacity, 1)) !important;
}

.bg-popover {
    --tw-bg-opacity: 1;
    background-color: hsl(var(--color-popover) / var(--tw-bg-opacity, 1)) !important;
}

.text-popover-foreground {
    --tw-text-opacity: 1;
    color: hsl(var(--color-popover-foreground) / var(--tw-text-opacity, 1)) !important;
}

.bg-primary {
    --tw-bg-opacity: 1;
    background-color: hsl(var(--color-primary) / var(--tw-bg-opacity, 1)) !important;
}

.text-primary {
    --tw-text-opacity: 1;
    color: hsl(var(--color-primary) / var(--tw-text-opacity, 1)) !important;
}

.text-primary-foreground {
    --tw-text-opacity: 1;
    color: hsl(var(--color-primary-foreground) / var(--tw-text-opacity, 1)) !important;
}

.bg-destructive {
    --tw-bg-opacity: 1;
    background-color: hsl(var(--color-destructive) / var(--tw-bg-opacity, 1)) !important;
}

.text-destructive-foreground {
    --tw-text-opacity: 1;
    color: hsl(var(--color-destructive-foreground) / var(--tw-text-opacity, 1)) !important;
}

.theme-option {
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.theme-option-active {
    background-color: hsl(var(--color-accent) / 0.65) !important;
    color: hsl(var(--color-foreground));
}

.dark .theme-option-active {
    background-color: hsl(var(--color-secondary) / 0.55) !important;
    color: hsl(var(--color-foreground));
}

/* Tailwind slate color classes */
.bg-slate-1 { background-color: var(--slate-1); }
.bg-slate-2 { background-color: var(--slate-2); }
.bg-slate-3 { background-color: var(--slate-3); }
.bg-slate-4 { background-color: var(--slate-4); }
.border-slate-4 { border-color: var(--slate-4); }
.border-slate-200 { border-color: var(--slate-200); }
.border-slate-800 { border-color: var(--slate-800); }

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--slate-6);
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--slate-4);
}

/* Smooth transitions */
.transition-colors {
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

/* Disable transitions during theme switching to prevent staggered color updates.
   Exception: .theme-toggle-indicator and .display-toggle-indicator need their sliding animation */
html.switching-theme,
html.switching-theme *:not(.theme-toggle-indicator):not(.display-toggle-indicator),
html.switching-theme *::before,
html.switching-theme *::after {
    transition: none !important;
}

/* Sidebar sessions loader */
.sessions-loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    min-height: 100%;
    gap: 1rem;
    padding: 2.5rem 1rem;
    transition: opacity 0.4s ease, transform 0.4s ease;
    box-sizing: border-box;
}

.sessions-loader.hidden {
    opacity: 0;
    transform: scale(0.95);
    pointer-events: none;
    position: absolute;
}

.loader-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.125rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: hsl(var(--color-muted-foreground));
    opacity: 0.8;
}

.loader-bar {
    width: 120px;
    height: 3px;
    background: hsl(var(--color-muted-foreground) / 0.25);
    border-radius: 2px;
    overflow: hidden;
}

.loader-bar-fill {
    width: 40%;
    height: 100%;
    background: hsl(var(--color-muted-foreground) / 0.6);
    border-radius: 2px;
    animation: loaderSlide 1.2s ease-in-out infinite;
}

@keyframes loaderSlide {
    0% {
        transform: translateX(-100%);
    }
    50% {
        transform: translateX(150%);
    }
    100% {
        transform: translateX(350%);
    }
}

/* Standardized hover highlight - uses --color-hover for consistency */
.hover-highlight:hover {
    background-color: hsl(var(--color-hover)) !important;
}

/* Session list styles */
.chat-session {
    transition: all 0.15s ease;
    -webkit-tap-highlight-color: transparent; /* Remove iOS tap highlight */
}

/* Only apply hover styles on devices with pointer hover (not touch) */
@media (hover: hover) and (pointer: fine) {
    .chat-session:hover {
        background-color: hsl(var(--color-hover) / 0.7);
    }
}

/* Touch feedback - :active works on single tap for touch devices */
.chat-session:active {
    background-color: hsl(var(--color-hover) / 0.7);
}

/* Sessions list reveal animation */
#sessions-list.sessions-revealing {
    animation: sessionsReveal 0.35s ease-out forwards;
}

#sessions-list.sessions-virtualized {
    gap: 0;
}

.session-virtual-spacer,
.session-group-spacer {
    flex-shrink: 0;
}

.session-group-spacer {
    height: 12px;
}

@keyframes sessionsReveal {
    from {
        opacity: 0;
        transform: translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.chat-session.active {
    background-color: hsl(var(--color-hover));
}

.session-star-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.375rem;
    height: 2.25rem;
    flex-shrink: 0;
    color: hsl(var(--color-muted-foreground));
    transition: color 0.15s ease, opacity 0.15s ease, transform 0.15s ease;
}

.chat-session .session-menu-btn {
    width: 1.75rem;
    padding: 0;
}

.chat-session .session-menu-btn svg {
    width: 1rem;
    height: 1rem;
}

.session-star-btn:hover,
.session-star-btn:focus-visible {
    color: hsl(var(--color-foreground));
    outline: none;
}

.session-star-btn--starred {
    color: hsl(42 90% 52%);
}

.session-star-btn--starred:hover,
.session-star-btn--starred:focus-visible {
    color: hsl(42 95% 58%);
}

.sidebar-search-shortcut {
    position: absolute;
    right: 2.6rem;
    top: 50%;
    display: flex;
    align-items: center;
    gap: 0.125rem;
    transform: translateY(-50%);
    pointer-events: none;
    color: hsl(var(--color-muted-foreground));
    font-size: 0.75rem;
    line-height: 1;
}

#search-rooms {
    padding-right: 5.75rem;
}

.sidebar-filter-btn {
    position: absolute;
    right: 0.375rem;
    top: 50%;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    transform: translateY(-50%);
    border-radius: 0.375rem;
}

.sidebar-filter-btn[data-active="true"] {
    color: hsl(var(--color-foreground));
    background-color: hsl(var(--color-hover));
}

.sidebar-filter-btn[data-active="true"]::after {
    content: "";
    position: absolute;
    top: 0.25rem;
    right: 0.25rem;
    width: 0.375rem;
    height: 0.375rem;
    border-radius: 999px;
    background-color: hsl(42 90% 52%);
}

.sidebar-filter-menu {
    position: absolute;
    right: 0;
    top: 2.375rem;
    z-index: 60;
    width: 11rem;
    max-width: calc(100vw - 1rem);
    padding: 0.25rem;
    border: 1px solid hsl(var(--color-border) / 0.8);
    border-radius: 0.5rem;
    background: hsl(var(--color-popover));
    color: hsl(var(--color-popover-foreground));
    box-shadow: none;
}

.sidebar-filter-toggle-row,
.sidebar-filter-field,
.sidebar-filter-clear {
    display: flex;
    align-items: center;
    width: 100%;
    min-height: 1.75rem;
    border-radius: 0.3125rem;
    padding: 0.25rem 0.375rem;
    color: hsl(var(--color-muted-foreground));
    font-size: 0.6875rem;
    line-height: 1rem;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.sidebar-filter-toggle-row,
.sidebar-filter-field {
    justify-content: space-between;
    gap: 0.5rem;
}

.sidebar-filter-toggle-row:hover,
.sidebar-filter-clear:hover {
    background-color: hsl(var(--color-hover));
    color: hsl(var(--color-foreground));
}

.sidebar-filter-toggle-row.active {
    background-color: hsl(var(--color-primary) / 0.12);
    color: hsl(var(--color-foreground));
}

.sidebar-filter-check {
    width: 0.75rem;
    height: 0.75rem;
    border: 1px solid hsl(var(--color-border));
    border-radius: 999px;
    flex-shrink: 0;
}

.sidebar-filter-toggle-row.active .sidebar-filter-check {
    border-color: hsl(42 90% 52%);
    background: hsl(42 90% 52%);
    box-shadow: inset 0 0 0 2px hsl(var(--color-popover));
}

.sidebar-filter-field + .sidebar-filter-field {
    border-top: 1px solid hsl(var(--color-border) / 0.45);
    border-radius: 0;
}

.sidebar-filter-field select,
.sidebar-filter-field input {
    min-width: 0;
    width: 6.5rem;
    border: 0;
    background: transparent;
    color: hsl(var(--color-foreground));
    font-size: 0.6875rem;
    line-height: 1rem;
    outline: none;
    text-align: right;
}

.sidebar-filter-field select {
    appearance: none;
    padding-right: 0.75rem;
    background-image:
        linear-gradient(45deg, transparent 50%, currentColor 50%),
        linear-gradient(135deg, currentColor 50%, transparent 50%);
    background-position:
        calc(100% - 0.4rem) 50%,
        calc(100% - 0.15rem) 50%;
    background-size: 0.25rem 0.25rem, 0.25rem 0.25rem;
    background-repeat: no-repeat;
}

.sidebar-filter-clear {
    justify-content: center;
    margin-top: 0.125rem;
    min-height: 1.5rem;
    padding: 0.125rem 0.375rem;
}

/* Message styles */
.message-user {
    position: relative;
    background-color: hsl(var(--blue-700));
    color: hsl(var(--color-accent-primary-foreground));
    border-radius: 0.875rem;
    font-size: 0.875rem;
}

.message-user p {
    font-size: 0.875rem;
    margin: 0;
    white-space: pre-wrap; /* Preserve whitespace and newlines */
}

/* Scrubber-togglable messages - height locked after initial render */
.message-user.scrubber-togglable.height-locked {
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: hsl(var(--color-muted-foreground) / 0.3) transparent;
}

.message-user.scrubber-togglable.height-locked::-webkit-scrollbar {
    width: 6px;
}

.message-user.scrubber-togglable.height-locked::-webkit-scrollbar-track {
    background: transparent;
}

.message-user.scrubber-togglable.height-locked::-webkit-scrollbar-thumb {
    background: hsl(var(--color-muted-foreground) / 0.3);
    border-radius: 3px;
}

.message-user.scrubber-togglable.height-locked::-webkit-scrollbar-thumb:hover {
    background: hsl(var(--color-muted-foreground) / 0.5);
}

/* Collapsible long user messages */
.user-message-collapsible {
    position: relative;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.user-message-collapsible.collapsed {
    max-height: 6rem; /* ~4-5 lines */
}

/* Fade gradient overlay for collapsed state */
.user-message-collapsible.collapsed::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2.5rem;
    background: linear-gradient(to bottom, transparent 0%, hsl(var(--blue-700) / 0.85) 100%);
    pointer-events: none;
}

/* Show more button - overlaid on content when collapsed */
.user-message-show-more {
    display: block;
    width: 100%;
    padding: 0;
    margin-top: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    background: transparent;
    border: none;
    cursor: pointer;
    text-align: right;
    transition: color 0.15s ease;
}

.user-message-show-more:hover {
    color: rgba(255, 255, 255, 1);
}

/* When collapsed, overlay the button on the content */
.user-message-collapsible.collapsed + .user-message-show-more {
    position: absolute;
    bottom: 0.5rem;
    right: 0.75rem;
    width: auto;
    margin-top: 0;
    z-index: 1;
}

.message-assistant {
    background-color: var(--slate-2);
    border: 1px solid var(--slate-4);
    border-radius: 0.875rem;
    font-size: 0.875rem;
}

.quick-ask-popover {
    position: fixed;
    z-index: 45;
    pointer-events: auto;
}

.quick-ask-popover.hidden,
.quick-ask-window.hidden {
    display: none;
}

.quick-ask-popover-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    height: 2rem;
    padding: 0 0.65rem;
    border-radius: 0.5rem;
    border: 1px solid hsl(var(--color-border));
    background: hsl(var(--color-popover) / 0.96);
    color: hsl(var(--color-popover-foreground));
    box-shadow: 0 8px 20px rgb(0 0 0 / 0.14);
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1;
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    transition: background-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.quick-ask-popover-btn:hover,
.quick-ask-popover-btn:focus-visible {
    background: hsl(var(--color-muted));
    color: hsl(var(--color-foreground));
    outline: none;
}

.quick-ask-window {
    position: fixed;
    z-index: 45;
    width: min(520px, calc(100vw - 32px));
    max-height: min(520px, calc(100vh - 32px));
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid hsl(var(--color-border));
    border-radius: 0.75rem;
    background: hsl(var(--color-popover));
    color: hsl(var(--color-popover-foreground));
    box-shadow: 0 14px 34px rgb(0 0 0 / 0.18);
}

body.quick-ask-layer-active .absolute.bottom-0.left-0.right-0,
body.quick-ask-layer-active #input-card,
body.quick-ask-layer-active div:has(> #input-card.scrubber-preview-expanded),
body.quick-ask-layer-active #input-card.scrubber-preview-expanded {
    z-index: 40 !important;
}

.quick-ask-mini-chat {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    overflow-y: auto;
    padding: 1rem;
    overscroll-behavior: contain;
}

.quick-ask-turn {
    display: flex;
    min-width: 0;
}

.quick-ask-turn-user {
    justify-content: flex-end;
}

.quick-ask-turn-assistant {
    justify-content: flex-start;
}

.quick-ask-user-bubble {
    max-width: 84%;
    line-height: 1.45;
    overflow-wrap: anywhere;
}

.quick-ask-assistant-bubble {
    width: 100%;
    padding: 0.85rem 1rem;
    border-radius: 0.85rem;
}

.quick-ask-assistant-bubble.quick-ask-assistant-pending {
    padding-bottom: 1.45rem;
}

.quick-ask-status {
    display: none;
}

.quick-ask-answer {
    max-width: none;
    font-size: 0.875rem;
    line-height: 1.55;
}

.quick-ask-reasoning {
    margin-bottom: 0.25rem;
}

.quick-ask-reasoning .reasoning-content {
    max-height: 8.5rem;
    margin-left: 1.45rem;
}

.quick-ask-answer :first-child {
    margin-top: 0;
}

.quick-ask-answer :last-child {
    margin-bottom: 0;
}

.quick-ask-answer pre {
    max-height: 12rem;
}

.quick-ask-sources {
    margin-top: 0.65rem;
    border-top: 1px solid hsl(var(--color-border) / 0.65);
    padding-top: 0.55rem;
}

.quick-ask-sources-label {
    margin-bottom: 0.25rem;
    font-size: 0.68rem;
    font-weight: 650;
    line-height: 1.2;
}

.quick-ask-sources-list {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.quick-ask-source {
    display: block;
    overflow: hidden;
    color: hsl(var(--color-muted-foreground));
    font-size: 0.72rem;
    line-height: 1.35;
    text-overflow: ellipsis;
    white-space: nowrap;
}

a.quick-ask-source:hover,
a.quick-ask-source:focus-visible {
    color: hsl(var(--color-foreground));
    text-decoration: underline;
    text-underline-offset: 2px;
    outline: none;
}

@media (max-width: 640px) {
    .quick-ask-window {
        width: min(520px, calc(100vw - 24px));
        max-height: min(64vh, 460px);
    }
}

/* Imported thumbnails row (e.g., from ChatGPT exports) */
.imported-thumbnails-row {
    scrollbar-width: thin;
    scrollbar-color: var(--slate-5) transparent;
}

.imported-thumbnails-row::-webkit-scrollbar {
    height: 4px;
}

.imported-thumbnails-row::-webkit-scrollbar-track {
    background: transparent;
}

.imported-thumbnails-row::-webkit-scrollbar-thumb {
    background-color: var(--slate-5);
    border-radius: 2px;
}

.imported-thumbnail-card {
    display: block;
}

.imported-thumbnail-card img {
    transition: transform 0.15s ease, opacity 0.15s ease;
}

.imported-thumbnail-card:hover img {
    transform: scale(1.05);
}

/* Reasoning trace styles for thinking models */
/* NOTE: Removed fadeIn animation to prevent flash on session switch.
   Animation is added via .fade-in class in appendMessage() for new messages only. */
.reasoning-trace {
    margin-bottom: 0;
}

/* Add spacing after reasoning content only when expanded */
.reasoning-trace:has(.reasoning-content:not(.hidden)) {
    margin-bottom: 0.5rem;
}

/*
 * =============================================================================
 * SHIMMER ANIMATION FOR STREAMING INDICATORS
 * =============================================================================
 *
 * Creates a "wave of light" effect that sweeps across text during streaming.
 * Used on: reasoning subtitle button, "Thinking..." loading indicator.
 *
 * HOW IT WORKS:
 * 1. A gradient (dim → bright → dim) is applied as the text's background
 * 2. `background-clip: text` makes the gradient only visible through the text
 * 3. `text-fill-color: transparent` makes text transparent so gradient shows
 * 4. Animation moves the gradient position, creating a sweeping shimmer
 *
 * CONFIGURATION (adjust variables below):
 * - --shimmer-min-opacity: Minimum text brightness (0-1). Higher = always readable
 * - --shimmer-duration: Animation cycle length. Shorter = faster shimmer
 * - --shimmer-gradient-size: Width of gradient relative to text (%).
 *   200% means gradient is 2x text width, creating a smooth sweep.
 *
 * CRITICAL IMPLEMENTATION NOTES:
 * 1. Use SEPARATE background properties (background-image, background-size, etc.)
 *    NOT the `background` shorthand. The shorthand resets background-position
 *    on every frame, preventing the animation from working.
 *
 * 2. For elements updated frequently (like "Thinking..."), the DOM element must
 *    NOT be recreated on each update. Recreating resets the animation to frame 0.
 *    See ChatArea.js typewriterTick() for the pattern that preserves the element.
 *
 * 3. Use `background-repeat: repeat` to ensure gradient always covers text,
 *    preventing text from disappearing during animation.
 *
 * 4. Keyframes must move exactly one gradient-width (matching --shimmer-gradient-size)
 *    to create a seamless loop. E.g., 200% size → animate 200% to 0%.
 */

/* Shimmer configuration variables */
:root {
    --shimmer-min-opacity: 0.6;      /* Minimum brightness (0.5-0.8 recommended) */
    --shimmer-duration: 2s;          /* Animation duration (1.5s-3s recommended) */
    --shimmer-gradient-size: 200%;   /* Gradient width relative to element */
}

/* Shimmer keyframes - moves gradient one full width for seamless loop */
@keyframes reasoningShimmer {
    0% {
        background-position: var(--shimmer-gradient-size) center;
    }
    100% {
        background-position: 0% center;
    }
}

/*
 * Shimmer effect class - apply to any text element for streaming indication.
 * Uses !important to override inherited styles from parent containers.
 */
.reasoning-subtitle-streaming {
    /* Gradient: dim edges, bright center */
    background-image: linear-gradient(
        90deg,
        hsl(var(--color-foreground) / var(--shimmer-min-opacity)) 0%,
        hsl(var(--color-foreground)) 50%,
        hsl(var(--color-foreground) / var(--shimmer-min-opacity)) 100%
    ) !important;

    /* Gradient sizing - must match keyframe movement for seamless loop */
    background-size: var(--shimmer-gradient-size) 100% !important;

    /* Repeat ensures gradient always covers text, no gaps */
    background-repeat: repeat !important;

    /* Clip gradient to text shape */
    background-clip: text !important;
    -webkit-background-clip: text !important;

    /* Make text transparent so gradient shows through */
    -webkit-text-fill-color: transparent !important;
    color: transparent !important;

    /* Animation - ease-in-out for smooth acceleration/deceleration */
    animation: reasoningShimmer var(--shimmer-duration) ease-in-out infinite !important;
}

.reasoning-content {
    padding: 0.25rem 0 0 0;
    margin-left: 1.75rem;
    line-height: 1.4;
    white-space: normal; /* avoid rendering inter-element newlines as extra lines */
    word-wrap: break-word;
    opacity: 0.85;
}

/* Streaming uses div wrappers for each line to enable vertical spacing */
.reasoning-content.streaming .streaming-line {
    margin-bottom: 0.4em;
}

/* Empty lines collapse but still contribute some spacing */
.reasoning-content.streaming .streaming-line:empty {
    margin-bottom: 0.2em;
}

/* Bold titles in streaming state get extra spacing */
.reasoning-content.streaming strong {
    display: block;
    margin-top: 0.5em;
    margin-bottom: 0.15em;
}

/* First element doesn't need top margin */
.reasoning-content.streaming > :first-child strong:first-child,
.reasoning-content.streaming > .streaming-line:first-child strong {
    margin-top: 0;
}

/* Loading indicator at bottom of reasoning content during streaming */
/* Inherits shimmer animation from .reasoning-subtitle-streaming */
.reasoning-loading-indicator {
    display: block;
    margin-top: 0.75em;
    font-size: 0.75rem;
    font-weight: 600;
    opacity: 1; /* Override parent's 0.85 opacity to match bold subtitles */
}

.pending-response-line {
    margin-left: 1.375rem;
    line-height: 1.25;
    transform: translateY(-4px);
}

.pending-response-label {
    font-size: 0.75rem;
    color: hsl(var(--color-muted-foreground) / 0.8);
}

@keyframes pendingResponseShimmer {
    0% {
        background-position: 240% center;
    }
    100% {
        background-position: 0% center;
    }
}

.pending-response-streaming {
    background-image: linear-gradient(
        90deg,
        hsl(var(--color-muted-foreground) / 0.48) 0%,
        hsl(var(--color-muted-foreground) / 0.88) 50%,
        hsl(var(--color-muted-foreground) / 0.48) 100%
    ) !important;
    background-size: 240% 100% !important;
    background-repeat: repeat !important;
    background-clip: text !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    color: transparent !important;
    animation: pendingResponseShimmer 1.9s ease-in-out infinite alternate !important;
}

.session-title-input.session-title-generating[readonly] {
    background-image: linear-gradient(
        90deg,
        hsl(var(--color-muted-foreground) / 0.55) 0%,
        hsl(var(--color-foreground) / 0.95) 50%,
        hsl(var(--color-muted-foreground) / 0.55) 100%
    ) !important;
    background-size: 240% 100% !important;
    background-repeat: repeat !important;
    background-clip: text !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    color: transparent !important;
    animation: pendingResponseShimmer 1.9s ease-in-out infinite alternate !important;
}

.reasoning-trace:has(.agent-trace-content.hidden) {
    margin-bottom: -0.25rem;
}

.reasoning-trace:has(.agent-trace-content:not(.hidden)) {
    margin-bottom: 0.5rem;
}

.agent-trace-content {
    max-height: 300px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: hsl(var(--color-border) / 0.3) transparent;
}

.agent-trace-content .agent-step {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.3rem;
    padding: 0.15rem 0;
    margin-left: 0;
    line-height: 1.5;
    font-size: 0.68rem;
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
}

.agent-trace-content .agent-step-tool.is-latest .agent-step-name,
.agent-trace-content .agent-step-phase.is-latest .agent-step-phase-label {
    background-image: linear-gradient(
        90deg,
        hsl(var(--color-muted-foreground) / var(--shimmer-min-opacity)) 0%,
        currentColor 50%,
        hsl(var(--color-muted-foreground) / var(--shimmer-min-opacity)) 100%
    );
    background-size: var(--shimmer-gradient-size) 100%;
    background-repeat: repeat;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    animation: reasoningShimmer var(--shimmer-duration) ease-in-out infinite;
}

.agent-step-name,
.agent-step-args,
.agent-step-result {
    font-family: var(--font-mono);
    font-size: 0.68rem;
}

.agent-step-name {
    color: hsl(var(--color-accent-primary) / 0.85);
    font-weight: 600;
    flex-shrink: 0;
}

.agent-step-args {
    color: hsl(var(--color-muted-foreground) / 0.52);
    min-width: 0;
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
    overflow-wrap: anywhere;
}

.agent-step-result {
    color: hsl(var(--color-muted-foreground) / 0.42);
    min-width: 0;
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
    overflow-wrap: anywhere;
}

.agent-step-result.is-pending {
    color: hsl(var(--color-muted-foreground) / 0.5);
    font-style: italic;
}

.agent-step-phase-label,
.agent-step-thinking-text {
    font-size: 0.68rem;
    color: hsl(var(--color-muted-foreground) / 0.62);
    white-space: normal;
    overflow-wrap: anywhere;
}

.agent-step-thinking {
    white-space: normal;
}

.memory-approval-primary {
    background-color: hsl(var(--color-accent-primary) / 0.1);
    border-color: hsl(var(--color-accent-primary) / 0.25);
    color: hsl(var(--color-accent-primary));
}

.memory-approval-primary:hover {
    background-color: hsl(var(--color-accent-primary) / 0.18);
    border-color: hsl(var(--color-accent-primary) / 0.4);
}

.dark .memory-approval-primary {
    background-color: hsl(var(--color-accent-primary) / 0.15);
    border-color: hsl(var(--color-accent-primary) / 0.2);
    color: hsl(var(--color-accent-primary) / 0.85);
}

.dark .memory-approval-primary:hover {
    background-color: hsl(var(--color-accent-primary) / 0.22);
    border-color: hsl(var(--color-accent-primary) / 0.35);
}

.memory-approval-secondary {
    background-color: hsl(var(--color-accent-primary) / 0.04);
    border-color: hsl(var(--color-accent-primary) / 0.14);
    color: hsl(var(--color-accent-primary) / 0.78);
}

.memory-approval-secondary:hover {
    background-color: hsl(var(--color-accent-primary) / 0.1);
    border-color: hsl(var(--color-accent-primary) / 0.24);
}

.dark .memory-approval-secondary {
    background-color: hsl(var(--color-accent-primary) / 0.1);
    border-color: hsl(var(--color-accent-primary) / 0.18);
    color: hsl(var(--color-accent-primary) / 0.82);
}

.dark .memory-approval-secondary:hover {
    background-color: hsl(var(--color-accent-primary) / 0.16);
    border-color: hsl(var(--color-accent-primary) / 0.28);
}

.memory-approval-success {
    background-color: rgba(73, 137, 102, 0.15);
    border-color: rgba(73, 137, 102, 0.25);
    color: #366B4D;
}

.dark .memory-approval-success {
    background-color: rgba(73, 137, 102, 0.25);
    border-color: rgba(73, 137, 102, 0.2);
    color: #6DB88E;
}

.memory-editor-dialog {
    animation: memEditorIn 0.2s ease-out;
    background: hsl(var(--color-background) / 0.4);
    backdrop-filter: saturate(140%) blur(28px);
    -webkit-backdrop-filter: saturate(140%) blur(28px);
    border-color: hsl(var(--color-border) / 0.5);
    box-shadow: 0 25px 60px -12px rgba(0, 0, 0, 0.12);
    --mem-divider: rgba(0, 0, 0, 0.15);
}

.dark .memory-editor-dialog {
    background: hsl(var(--color-card) / 0.38);
    border-color: hsl(var(--color-border) / 0.35);
    box-shadow: 0 25px 60px -12px rgba(0, 0, 0, 0.4);
    --mem-divider: hsl(var(--color-border) / 0.5);
}

#memory-editor-modal {
    background: rgba(0, 0, 0, 0.15);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

.dark #memory-editor-modal {
    background: rgba(0, 0, 0, 0.45);
}

@keyframes memEditorIn {
    from {
        opacity: 0;
        transform: scale(0.97) translateY(-8px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.escalation-prompt-overlay {
    position: fixed;
    inset: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.15);
}

.dark .escalation-prompt-overlay {
    background: rgba(0, 0, 0, 0.45);
}

.mem-toolbar-group {
    display: flex;
    align-items: center;
    gap: 1px;
    background: hsl(var(--color-muted) / 0.2);
    border-radius: 0.375rem;
    padding: 2px;
}

.mem-header-btn {
    font-size: 0.65rem;
    font-weight: 500;
    padding: 0.2rem 0.5rem;
    border-radius: 0.3rem;
    color: hsl(var(--color-muted-foreground));
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.12s ease;
    white-space: nowrap;
}

.mem-header-btn:hover {
    color: hsl(var(--color-foreground));
    background: hsl(var(--color-muted) / 0.5);
}

.mem-header-btn:disabled {
    opacity: 0.42;
    cursor: not-allowed;
}

.mem-header-btn:disabled:hover {
    color: hsl(var(--color-muted-foreground));
    background: transparent;
}

.mem-header-btn-danger {
    color: hsl(var(--color-destructive));
}

.mem-header-btn-danger:hover {
    color: hsl(var(--color-destructive));
    background: hsl(var(--color-destructive) / 0.1);
}

.mem-sidebar {
    border-right: 1px solid var(--mem-divider);
    scrollbar-width: thin;
    scrollbar-color: hsl(var(--color-border) / 0.3) transparent;
}

.mem-sidebar::-webkit-scrollbar {
    width: 4px;
}

.mem-sidebar::-webkit-scrollbar-thumb {
    background: hsl(var(--color-border) / 0.3);
    border-radius: 4px;
}

.mem-sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.mem-tree-row {
    display: flex;
    align-items: center;
    gap: 4px;
    height: 26px;
    min-height: 26px;
    padding-right: 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.1s ease;
    font-size: 12px;
    border-left: 2px solid transparent;
    overflow: hidden;
    min-width: 0;
}

.mem-tree-label {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.mem-tree-row:hover {
    background: hsl(var(--color-muted) / 0.25);
}

.mem-tree-row.is-selected {
    background: hsl(var(--color-accent) / 0.6);
    border-left-color: hsl(var(--color-accent-primary));
}

.mem-tree-row.is-selected .mem-tree-label {
    color: hsl(var(--color-foreground));
}

.mem-tree-file .mem-tree-label {
    color: hsl(var(--color-foreground) / 0.65);
    transition: color 0.1s ease;
}

.mem-tree-row:hover .mem-tree-label {
    color: hsl(var(--color-foreground));
}

.mem-tree-count {
    font-size: 10px;
    color: hsl(var(--color-muted-foreground) / 0.35);
    margin-left: auto;
    flex-shrink: 0;
    padding-right: 2px;
}

.mem-dir-children {
    position: relative;
}

.mem-dir-children::before {
    content: '';
    position: absolute;
    left: 17px;
    top: 0;
    bottom: 6px;
    width: 1px;
    background: hsl(var(--color-border) / 0.12);
    pointer-events: none;
}

.mem-chevron {
    width: 10px;
    height: 10px;
    flex-shrink: 0;
    color: hsl(var(--color-muted-foreground) / 0.4);
    transition: transform 0.15s ease;
}

.mem-chevron.is-expanded {
    transform: rotate(90deg);
}

.mem-dir-context-menu.hidden {
    display: none;
}

.mem-textarea {
    scrollbar-width: thin;
    scrollbar-color: hsl(var(--color-border) / 0.3) transparent;
}

.mem-textarea::-webkit-scrollbar {
    width: 4px;
}

.mem-textarea::-webkit-scrollbar-thumb {
    background: hsl(var(--color-border) / 0.3);
    border-radius: 4px;
}

.mem-textarea::-webkit-scrollbar-track {
    background: transparent;
}

/* Memory editor markdown preview */
.mem-preview {
    scrollbar-width: thin;
    scrollbar-color: hsl(var(--color-border) / 0.3) transparent;
}

.mem-preview::-webkit-scrollbar {
    width: 4px;
}

.mem-preview::-webkit-scrollbar-thumb {
    background: hsl(var(--color-border) / 0.3);
    border-radius: 4px;
}

.mem-preview::-webkit-scrollbar-track {
    background: transparent;
}

/* Compact prose overrides for memory panel */
.mem-preview.prose h1 {
    font-size: 1.125rem;
    margin-top: 0.75rem;
    margin-bottom: 0.5rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid hsl(var(--color-border) / 0.3);
}

.mem-preview.prose h2 {
    font-size: 1rem;
    margin-top: 0.75rem;
    margin-bottom: 0.5rem;
}

.mem-preview.prose h3 {
    font-size: 0.9375rem;
    margin-top: 0.5rem;
    margin-bottom: 0.375rem;
}

.mem-preview.prose p {
    margin-bottom: 0.5rem;
}

.mem-preview.prose ul,
.mem-preview.prose ol {
    margin-bottom: 0.5rem;
}

/* Memory item metadata formatting */
.mem-preview .mem-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 2px;
}

.mem-preview .mem-topic {
    display: inline-block;
    padding: 1px 6px;
    border-radius: 9999px;
    font-size: 0.6875rem;
    line-height: 1.4;
    background: hsl(var(--color-border) / 0.15);
    color: hsl(var(--color-foreground) / 0.5);
}

.mem-preview .mem-confidence-group {
    display: inline-flex;
    align-items: center;
    gap: 3px;
}

.mem-preview .mem-confidence-label {
    font-size: 0.6875rem;
    color: hsl(var(--color-foreground) / 0.35);
}

.mem-preview .mem-confidence {
    display: inline-flex;
    align-items: center;
}

.mem-preview .mem-confidence svg {
    width: 0.85rem;
    height: 0.85rem;
    color: hsl(var(--color-foreground) / 0.55);
    position: relative;
    top: -1px;
}

.mem-preview .mem-confidence .effort-muted {
    opacity: 0.25;
}

.mem-preview .mem-date {
    font-size: 0.6875rem;
    color: hsl(var(--color-foreground) / 0.35);
}

.escalation-prompt-editable {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    font-size: 13px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    line-height: 1.625;
    word-wrap: break-word;
    color: hsl(var(--color-foreground));
    outline: none;
    min-height: 120px;
    scrollbar-width: thin;
    scrollbar-color: hsl(var(--color-border) / 0.3) transparent;
}

.escalation-prompt-editable::-webkit-scrollbar {
    width: 4px;
}

.escalation-prompt-editable::-webkit-scrollbar-thumb {
    background: hsl(var(--color-border) / 0.3);
    border-radius: 4px;
}

.escalation-prompt-editable::-webkit-scrollbar-track {
    background: transparent;
}

.escalation-prompt-editable.read-only {
    opacity: 0.8;
    cursor: default;
    user-select: text;
}

.mem-prompt-preview {
    scrollbar-width: thin;
    scrollbar-color: hsl(var(--color-border) / 0.3) transparent;
}

.mem-prompt-box {
    border: 1px solid hsl(var(--color-border) / 0.5);
    border-radius: 0.5rem;
    background: hsl(var(--color-muted) / 0.25);
    overflow: hidden;
}

.mem-prompt-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 0.375rem 0.75rem;
    border-bottom: 1px solid hsl(var(--color-border) / 0.35);
    background: hsl(var(--color-muted) / 0.3);
}

.mem-prompt-header {
    font-weight: 500;
    font-size: 0.6875rem;
}

.mem-prompt-header-meta {
    display: inline-flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.mem-prompt-confidence {
    display: inline-flex;
    align-items: center;
    min-height: 1.15rem;
    padding: 0.05rem 0.4rem;
    border-radius: 9999px;
    border: 1px solid hsl(var(--color-border) / 0.45);
    background: hsl(var(--color-background) / 0.45);
    color: hsl(var(--color-muted-foreground));
    font-size: 0.65rem;
    line-height: 1.2;
    white-space: nowrap;
}

.mem-prompt-confidence-high {
    border-color: rgba(73, 137, 102, 0.25);
    background: rgba(73, 137, 102, 0.12);
    color: #3f7f5d;
}

.dark .mem-prompt-confidence-high {
    color: #6DB88E;
}

.mem-prompt-confidence-medium {
    border-color: rgba(180, 132, 44, 0.25);
    background: rgba(180, 132, 44, 0.12);
    color: #8a682c;
}

.dark .mem-prompt-confidence-medium {
    color: #d0a24f;
}

.mem-prompt-legend {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.625rem;
    color: hsl(var(--color-foreground) / 0.4);
    white-space: nowrap;
    flex-shrink: 0;
}

.mem-prompt-legend-swatch {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 2px;
    background: rgba(73, 137, 102, 0.15);
    border: 1px solid rgba(73, 137, 102, 0.3);
}

:root.dark .mem-prompt-legend-swatch {
    background: rgba(73, 137, 102, 0.25);
    border-color: rgba(73, 137, 102, 0.4);
}

.mem-prompt-body {
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
    line-height: 1.5;
}

.mem-prompt-files {
    font-size: 0.6875rem;
    margin-bottom: 0.375rem;
}

.mem-prompt-file {
    font-size: 0.6875rem !important;
    padding: 1px 4px;
    border-radius: 3px;
    background: hsl(var(--color-muted) / 0.6);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}
.mem-prompt-file:hover {
    background: hsl(var(--color-muted) / 1);
    color: hsl(var(--color-foreground));
}

.user-data-highlight {
    background: rgba(73, 137, 102, 0.15);
    color: #366B4D;
    border-radius: 2px;
    padding: 0 2px;
}

:root.dark .user-data-highlight {
    background: rgba(73, 137, 102, 0.25);
    color: #6DB88E;
}

/* Remove extra margins and whitespace from markdown elements in reasoning */
.reasoning-content > *:first-child {
    margin-top: 0;
}

.reasoning-content > *:last-child {
    margin-bottom: 0 !important;
}

/* Spacing between paragraphs */
.reasoning-content p {
    margin: 0.75em 0;
}

/* First paragraph has no top margin */
.reasoning-content p:first-child {
    margin-top: 0;
}

/* Bold subtitles as standalone paragraphs */
.reasoning-content p:has(> strong:only-child) {
    /* Create more space before the subtitle and tighten after it */
    margin-top: 0.8em;
    margin-bottom: 0.35em;
}

/* Style the inner strong but let the paragraph carry spacing */
.reasoning-content p > strong:only-child {
    display: block;
    font-weight: 600;
    color: hsl(var(--color-foreground));
}

/* If the very first paragraph is a subtitle (bold-only), allow top spacing */
.reasoning-content > p:first-child:has(> strong:only-child) {
    margin-top: 0.5em;
}

/* Compact the element immediately following a bold-only subtitle */
.reasoning-content p:has(> strong:only-child) + * {
    margin-top: 2px;  /* this adds space before paragraphs */
}

/* Enhanced heading styles for clear visual hierarchy */
.reasoning-content h1,
.reasoning-content h2,
.reasoning-content h3,
.reasoning-content h4,
.reasoning-content h5,
.reasoning-content h6 {
    /* Consistent spacing before headings, slightly tighter after */
    margin: 0.8em 0 0.3em 0;
    font-weight: 600;
    color: hsl(var(--color-foreground));
    opacity: 1;
}

.reasoning-content h1 {
    font-size: 1.1em;
    border-bottom: 1px solid hsl(var(--color-border) / 0.3);
    padding-bottom: 0.25em;
}

.reasoning-content h2 {
    font-size: 1.05em;
}

.reasoning-content h3 {
    font-size: 1em;
}

.reasoning-content h4,
.reasoning-content h5,
.reasoning-content h6 {
    font-size: 0.95em;
}

.reasoning-content h1:first-child,
.reasoning-content h2:first-child,
.reasoning-content h3:first-child,
.reasoning-content h4:first-child,
.reasoning-content h5:first-child,
.reasoning-content h6:first-child {
    /* Slightly less space before the first heading */
    margin-top: 0.5em;
}

/* Make bold text (summaries) stand out more clearly */
.reasoning-content strong {
    font-weight: 600;
    color: hsl(var(--color-foreground));
    opacity: 1;
}

/* Add subtle indentation for content following headings */
.reasoning-content h1 + p,
.reasoning-content h2 + p,
.reasoning-content h3 + p {
    margin-left: 0.5em;
    opacity: 0.85;
}

/* Improve list styling within reasoning */
.reasoning-content ul,
.reasoning-content ol {
    margin: 0.5em 0;
    padding-left: 1.5em;
}

.reasoning-content li {
    margin: 0.25em 0;
}

/* Code blocks within reasoning */
.reasoning-content code {
    background: hsl(var(--color-muted) / 0.3);
    padding: 0.125em 0.25em;
    border-radius: 0.25em;
    font-size: 0.9em;
}

.reasoning-content pre {
    background: hsl(var(--color-muted) / 0.3);
    padding: 0.5em;
    border-radius: 0.375em;
    overflow-x: auto;
    margin: 0.5em 0;
}

.reasoning-content pre code {
    background: transparent;
    padding: 0;
}

.reasoning-content::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.reasoning-content::-webkit-scrollbar-track {
    background: transparent;
}

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

.reasoning-content::-webkit-scrollbar-thumb:hover {
    background: hsl(var(--color-muted-foreground) / 0.3);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Citations section styles */
.citations-section {
    animation: fadeIn 0.3s ease-in;
    margin-top: 0.5rem;
    margin-bottom: 0;
}

.citations-toggle-btn {
    cursor: pointer;
    border: none;
    background: transparent;
    font-size: 0.75rem;
}

.citations-toggle-btn:hover {
    background: hsl(var(--color-muted) / 0.5);
}

.dark .citations-toggle-btn:hover {
    background-color: hsl(var(--color-muted) / 0.4) !important;
}

.citations-toggle-favicons {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
}

.citations-toggle-favicon {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    object-fit: cover;
    background: hsl(var(--color-background));
    border: 1.5px solid hsl(var(--color-background));
    margin-right: -6px;
    flex-shrink: 0;
}

.citations-toggle-favicon:last-child {
    margin-right: 0;
}

.citations-carousel {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding: 0.25rem 0.5rem;
    -webkit-overflow-scrolling: touch;
}

/* Hide scrollbar but keep functionality */
.citations-carousel::-webkit-scrollbar {
    height: 3px;
}

.citations-carousel::-webkit-scrollbar-track {
    background: transparent;
}

.citations-carousel::-webkit-scrollbar-thumb {
    background: hsl(var(--color-border));
    border-radius: 1.5px;
}

.citations-carousel::-webkit-scrollbar-thumb:hover {
    background: hsl(var(--color-muted-foreground) / 0.3);
}

/* Modern citation card design */
.citation-card-modern {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 180px;
    max-width: 240px;
    min-height: 80px;
    padding: 0.5rem;
    background: hsl(var(--color-background));
    border: 1px solid hsl(var(--color-border));
    border-radius: 0.75rem;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    flex-shrink: 0;
    overflow: hidden;
}

.citation-card-modern:hover {
    background: hsl(var(--color-muted) / 0.3);
    border-color: hsl(var(--color-primary) / 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* During active wheel scrolling, optimize for smooth scrolling */
.citations-carousel.wheel-active .citation-card-modern {
    pointer-events: none;
    will-change: transform;
}

/* Disable transform animations during carousel scrolling for smooth experience */
.citations-carousel.is-scrolling .citation-card-modern {
    transition: none;
}

.citations-carousel.is-scrolling .citation-card-modern:hover {
    transform: none;
}

/* Optimize carousel for smooth scrolling */
.citations-carousel {
    will-change: scroll-position;
}

/* Override display:flex when hidden - needed because display:flex comes after .hidden in cascade */
.citations-carousel.hidden {
    display: none;
}

.citation-card-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

.citation-favicon {
    width: 16px;
    height: 16px;
    object-fit: contain;
    border-radius: 0.25rem;
}

.citation-favicon-fallback {
    display: none;
    width: 16px;
    height: 16px;
    background: hsl(var(--color-primary) / 0.1);
    color: hsl(var(--color-primary));
    font-size: 0.65rem;
    font-weight: 600;
    align-items: center;
    justify-content: center;
    border-radius: 0.25rem;
}

.citation-domain {
    font-size: 0.65rem;
    color: hsl(var(--color-muted-foreground));
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.citation-title {
    font-size: 0.7rem;
    line-height: 1.2;
    color: hsl(var(--color-foreground));
    font-weight: 500;
    overflow: hidden;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    line-clamp: 2;
}

.citation-description {
    font-size: 0.65rem;
    line-height: 1.3;
    color: hsl(var(--color-muted-foreground));
    margin-top: 0.25rem;
    overflow: hidden;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    line-clamp: 2;
}

.citation-number {
    position: absolute;
    top: 0.25rem;
    right: 0.25rem;
    width: 18px;
    height: 18px;
    background: hsl(var(--color-primary) / 0.1);
    color: hsl(var(--color-primary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 600;
}

/* Highlight animation for citation cards */
@keyframes citationHighlight {
    0% {
        background: hsl(var(--color-primary) / 0.2);
        border-color: hsl(var(--color-primary) / 0.5);
    }
    100% {
        background: hsl(var(--color-background));
        border-color: hsl(var(--color-border));
    }
}

.citation-highlight {
    animation: citationHighlight 2s ease-out;
}

/* Inline citation markers */
.inline-citation {
    cursor: pointer;
    color: hsl(var(--color-primary));
    font-weight: 600;
    font-size: 0.75em;
    margin-left: 0.1em;
    margin-right: 0.1em;
    padding: 0.1em 0.2em;
    border-radius: 0.2em;
    transition: all 0.15s ease;
    text-decoration: none;
    line-height: 0;
    vertical-align: super;
}

.inline-citation:hover {
    background: hsl(var(--color-primary) / 0.1);
    color: hsl(var(--color-primary));
}

/* Inline Link Citations (Button Style) */
.inline-link-citation {
    display: inline;
    vertical-align: baseline;
}

.inline-link-button {
    display: inline-flex;
    align-items: center;
    gap: 0.15rem;
    padding: 0.05rem 0.3rem;
    background: hsl(var(--color-muted) / 0.3);
    border: 1px solid hsl(var(--color-border) / 0.8);
    border-radius: 0.75rem;
    color: hsl(var(--color-primary));
    font-size: 0.65rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.15s ease;
    white-space: nowrap;
    max-width: 160px;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.2;
    vertical-align: middle;
}

.inline-link-button:hover {
    background: hsl(var(--color-primary) / 0.08);
    border-color: hsl(var(--color-primary) / 0.25);
    transform: translateY(-0.5px);
    box-shadow: 0 1px 4px hsl(var(--color-foreground) / 0.08);
}

/* Disable hover effects during streaming to prevent flicker */
.streaming .inline-link-button:hover {
    background: hsl(var(--color-muted) / 0.3);
    border-color: hsl(var(--color-border) / 0.5);
    transform: none;
    box-shadow: none;
}
.dark .streaming .inline-link-button:hover {
    background: hsl(var(--color-muted) / 0.2);
    border-color: hsl(var(--color-border) / 0.6);
}

.inline-link-icon {
    width: 0.7rem;
    height: 0.7rem;
    flex-shrink: 0;
    border-radius: 0.125rem;
    object-fit: contain;
}

.inline-link-icon-fallback {
    width: 0.65rem;
    height: 0.65rem;
    flex-shrink: 0;
    opacity: 0.6;
}

.inline-link-domain {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Link Preview Card */
.link-preview-card {
    position: fixed;
    width: 260px;
    max-width: calc(100vw - 32px);
    background: hsl(var(--color-card));
    border: 1px solid hsl(var(--color-border));
    border-radius: 0.5rem;
    box-shadow: 0 2px 8px hsl(var(--color-foreground) / 0.06);
    padding: 0.625rem;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.12s ease, transform 0.12s ease;
    transform: translateY(-3px);
}

.link-preview-card.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.link-preview-loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.5rem;
    color: hsl(var(--color-muted-foreground));
    font-size: 0.6875rem;
}

.link-preview-spinner {
    width: 0.875rem;
    height: 0.875rem;
    border: 1.5px solid hsl(var(--color-border));
    border-top-color: hsl(var(--color-primary));
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* Match loading toast spinner to scrubbing blue border glow palette */
#app-toast .link-preview-spinner {
    border-color: rgba(59, 130, 246, 0.35);
    border-top-color: rgba(96, 165, 250, 0.95);
}

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

.link-preview-content {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    min-height: 50px;
}

/* Override display:flex when hidden - needed because display:flex comes after .hidden in cascade */
.link-preview-loader.hidden,
.link-preview-content.hidden {
    display: none;
}

.link-preview-header {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding-bottom: 0.375rem;
    border-bottom: 1px solid hsl(var(--color-border) / 0.4);
}

.link-preview-favicon {
    width: 0.875rem;
    height: 0.875rem;
    flex-shrink: 0;
    border-radius: 0.125rem;
    object-fit: contain;
}

.link-preview-domain {
    font-size: 0.625rem;
    color: hsl(var(--color-muted-foreground));
    font-weight: 500;
    letter-spacing: 0.01em;
    text-transform: lowercase;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.link-preview-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: hsl(var(--color-foreground));
    line-height: 1.25;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.link-preview-description {
    font-size: 0.6875rem;
    color: hsl(var(--color-muted-foreground));
    line-height: 1.3;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* Dark mode adjustments for link previews */
.dark .link-preview-card {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.dark .inline-link-button {
    background: hsl(var(--color-muted) / 0.2);
    border-color: hsl(var(--color-border) / 0.6);
}

.dark .inline-link-button:hover {
    background: hsl(var(--color-primary) / 0.1);
    border-color: hsl(var(--color-primary) / 0.2);
}

/* Mobile responsiveness for citations */
@media (max-width: 640px) {
    .citation-card-modern {
        min-width: 140px;
        max-width: 180px;
        min-height: 70px;
    }

    .citation-description {
        -webkit-line-clamp: 1;
        line-clamp: 1;
    }

    .citations-carousel {
        padding: 0.25rem;
    }
}

/* Prose styles for markdown */
.prose {
    max-width: none;
    font-size: 0.875rem;
    line-height: 1.6;
}

.prose h1 {
    font-size: 1.375rem;
    font-weight: 600;
    margin-top: 1.25rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid hsl(var(--color-border));
}

.prose h2 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-top: 1.25rem;
    margin-bottom: 0.75rem;
}

.prose h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.prose h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.prose p {
    margin-bottom: 0.75rem;
    word-wrap: break-word;
}

.prose ul, .prose ol {
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
}

.prose li {
    margin-top: 0.25rem;
    font-size: 0.875rem;
}

.prose ul {
    list-style-type: disc;
}

.prose ol {
    list-style-type: decimal;
}

.prose strong {
    font-weight: 600;
}

.prose em {
    font-style: italic;
}

.prose code {
    background-color: hsl(var(--color-muted));
    padding: 0.1rem 0.2rem;
    border-radius: 0.25rem;
    font-size: 0.8125rem;
    font-family: var(--font-mono);
}

/* Code Block Wrapper with Header
   --code-block-bg: Background for code content area
   --code-block-header: Background for language/copy header
   --code-block-border: Border color */
:root {
    --code-block-bg: hsl(220, 6%, 94%);      /* Light: neutral warm gray */
    --code-block-header: hsl(220, 6%, 91%);  /* Slightly darker for header */
    --code-block-border: hsl(220, 6%, 88%);  /* Subtle border */
}

.dark {
    --code-block-bg: hsl(0, 0%, 12%);        /* Dark: darker than default slate-3 */
    --code-block-header: hsl(0, 0%, 15%);    /* Slightly lighter header for contrast */
    --code-block-border: hsl(0, 0%, 18%);    /* Subtle border */
}

.code-block-wrapper {
    position: relative;
    margin-bottom: 0.75rem;
    border-radius: 0.5rem;
    overflow: hidden;
    background-color: var(--code-block-bg);
    border: 1px solid var(--code-block-border);
}

.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.4rem 0.75rem;
    background-color: var(--code-block-header);
    border-bottom: 1px solid var(--code-block-border);
    min-height: 2rem;
    overflow: hidden;
    position: relative;
    z-index: 1;
}

.code-block-lang {
    font-size: 0.7rem;
    font-weight: 500;
    color: hsl(var(--color-muted-foreground));
    text-transform: lowercase;
    letter-spacing: 0.02em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}

.code-block-copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.2rem 0.5rem;
    font-size: 0.7rem;
    font-weight: 500;
    color: hsl(var(--color-muted-foreground));
    background: transparent;
    border: none;
    border-radius: 0.25rem;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

.code-block-copy-btn:hover {
    color: hsl(var(--color-foreground));
    background-color: hsl(var(--color-background) / 0.5);
}

.code-block-copy-btn .copy-icon {
    width: 0.875rem;
    height: 0.875rem;
    flex-shrink: 0;
}

.code-block-copy-btn .copy-text {
    line-height: 1;
}

/* Code block pre/code styling */
.code-block-wrapper pre {
    margin: 0;
    padding: 0.75rem;
    background-color: transparent;
    overflow-x: auto;
    font-size: 0.8125rem;
    line-height: 1.5;
    position: relative;
}

.code-block-wrapper pre code {
    background-color: transparent;
    padding: 0;
    font-size: inherit;
    font-family: var(--font-mono);
}

/* Highlight.js overrides for theme consistency */
.code-block-wrapper pre code.hljs {
    background: transparent;
    padding: 0;
}

/* Dark mode code block - colors defined via CSS variables above */
.dark .code-block-copy-btn:hover {
    background-color: hsl(var(--color-secondary) / 0.5);
}

/* Fallback for prose pre without wrapper (inline code blocks) */
.prose pre:not(.code-block-wrapper pre) {
    background-color: hsl(var(--color-muted));
    padding: 0.75rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin-bottom: 0.75rem;
    font-size: 0.8125rem;
}

.prose pre:not(.code-block-wrapper pre) code {
    background-color: transparent;
    padding: 0;
    font-size: inherit;
}

.prose hr {
    margin: 1rem 0;
    border: none;
    border-top: 2px solid hsl(var(--color-border));
    opacity: 0.6;
}

.dark .prose hr {
    opacity: 0.8;
}

/* Dark mode adjustments for prose */
.dark .prose h1 {
    border-bottom-color: hsl(var(--color-border));
}

/* Blockquote styles */
.prose blockquote {
    border-left: 3px solid hsl(var(--color-border));
    padding-left: 0.75rem;
    margin-left: 0;
    margin-bottom: 0.75rem;
    color: hsl(var(--color-muted-foreground));
    font-style: italic;
    font-size: 0.875rem;
}

/* Input focus styles */
textarea:focus {
    outline: none;
}

/* Animation */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* Model category headers */
.model-category-header {
    font-size: 0.75rem;
    font-weight: 300;
    letter-spacing: 0.03em;
    color: hsl(var(--color-muted-foreground));
}

/* Dark mode hover fixes for better contrast */
.dark .model-option:hover {
    background-color: hsl(217.2 32.6% 25%) !important;
}

.dark .session-menu-btn:hover {
    background-color: hsl(217.2 32.6% 30%) !important;
}

/* Keyboard navigation highlight for model picker */
.keyboard-highlight {
    background-color: hsl(210 40% 96.1%) !important;
}

.dark .keyboard-highlight {
    background-color: hsl(217.2 32.6% 25%) !important;
}

/* Model picker styles */
[cmdk-input-wrapper] {
    position: relative;
    display: flex;
    align-items: center;
}

/* Chat area styling */
.chat-container {
    background: linear-gradient(to bottom, transparent, hsl(var(--color-background)) 10%);
}

#chat-area {
    background-color: hsl(var(--color-background));
}

#chat-area.prompt-slide-active {
    overflow-anchor: none;
}

/* Wide mode - increases message container max-width */
#messages-container {
    --messages-max-width: 44rem;
    position: relative;
    max-width: var(--messages-max-width);
    transition: max-width 0.2s ease;
}

.prompt-scroll-spacer {
    width: 100%;
    flex: 0 0 auto;
    pointer-events: none;
    overflow-anchor: none;
}

html.wide-mode #messages-container {
    --messages-max-width: 66rem; /* 1.5x of 44rem */
}

/* Wide mode button active state */
#wide-mode-btn.wide-active {
    color: hsl(var(--color-accent-primary)) !important;
    background-color: hsl(var(--color-accent-primary) / 0.1) !important;
}

#wide-mode-btn.wide-active:hover {
    background-color: hsl(var(--color-accent-primary) / 0.15) !important;
}

.dark #wide-mode-btn.wide-active {
    color: hsl(var(--color-accent-primary) / 0.85) !important;
    background-color: hsl(var(--color-accent-primary) / 0.2) !important;
}

.dark #wide-mode-btn.wide-active:hover {
    background-color: hsl(var(--color-accent-primary) / 0.25) !important;
}

/* ============================================
   FLAT MODE
   Removes bubbles from assistant messages,
   changes user messages to gray background
   ============================================ */

/* ----------------------------------------
   Settings Menu - Frosted Glass Effect
   Note: Settings menu is nested inside input-card which has backdrop-filter.
   Nested backdrop-filters have limited browser support, so we use a
   stronger blur and higher opacity to compensate.
   ---------------------------------------- */
/* ----------------------------------------
   Settings Menu - Frosted Glass Effect
   ----------------------------------------

   IMPORTANT: backdrop-filter stacking context behavior

   The input-card element has `isolation: isolate` which creates a new
   stacking context. Any descendant element's backdrop-filter can ONLY
   blur content within that stacking context - NOT the page content behind.

   Solution: The settings menu is moved to document.body via JavaScript
   (see ChatInput.js) when opened. This escapes input-card's stacking
   context, allowing backdrop-filter to properly blur page content.

   If you need frosted glass on other elements inside input-card:
   1. Move the element to document.body when shown (like this menu)
   2. Use position: fixed and calculate position from button rect
   3. Use the same glass CSS variables for consistency

   CSS Variables used (defined in :root):
   - --glass-opacity: Background transparency (0.78 dark, 0.82 light)
   - --glass-blur: Blur radius (14px dark, 12px light)
   ---------------------------------------- */
.settings-menu-glass {
    position: fixed !important;
    background: hsl(var(--color-card) / var(--glass-opacity));
    backdrop-filter: saturate(120%) blur(var(--glass-blur));
    -webkit-backdrop-filter: saturate(120%) blur(var(--glass-blur));
    border-color: hsl(var(--color-border) / 0.5);
}

/* ----------------------------------------
   Display Toggle (Segmented Control)
   Frosted glass iOS-style toggle for flat/bubble mode
   ---------------------------------------- */

.display-toggle-container {
    display: flex;
    position: relative;
    background: hsl(var(--color-muted) / 0.6);
    border-radius: 0.5rem;
    padding: 3px;
    gap: 2px;
}

/* Sliding frosted glass indicator */
.display-toggle-indicator {
    position: absolute;
    top: 3px;
    left: 3px;
    width: calc(50% - 4px);
    height: calc(100% - 6px);
    background: hsl(var(--color-background) / 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 0.375rem;
    box-shadow: 0 1px 3px hsl(0 0% 0% / 0.1), 0 1px 2px hsl(0 0% 0% / 0.06);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

/* Dark mode: deepen track so selected segment stands out more */
.dark #settings-menu .display-toggle-container,
.dark #settings-menu .theme-toggle-container,
.dark #welcome-theme-toggle {
    background: hsl(0 0% 10% / 0.78);
    box-shadow: none;
}

/* Dark mode: slightly more opaque indicator */
.dark #settings-menu .display-toggle-indicator,
.dark #welcome-theme-toggle .theme-toggle-indicator {
    background: hsl(0 0% 22% / 0.96);
    box-shadow: 0 1px 2px hsl(0 0% 0% / 0.18);
}

/* Move indicator to right when NOT in flat mode (bubble mode active) */
html:not(.flat-mode) #flat-mode-toggle .display-toggle-indicator {
    transform: translateX(calc(100% + 2px));
}

/* Toggle buttons */
.display-toggle-btn {
    flex: 1;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    color: hsl(var(--color-muted-foreground));
    transition: color 0.2s ease;
    cursor: pointer;
    background: transparent;
    border: none;
}

.display-toggle-btn:hover {
    color: hsl(var(--color-foreground));
}

/* Active button styling */
.display-toggle-btn[aria-checked="true"] {
    color: hsl(var(--color-foreground));
}

/* Compact variant for inline toggles */
.display-toggle-compact {
    padding: 3px;
}

.display-toggle-compact .display-toggle-indicator {
    top: 3px;
    left: 3px;
    width: calc(50% - 4px);
    height: calc(100% - 6px);
}

.display-toggle-compact .display-toggle-btn {
    padding: 0.4rem 0.6rem;
}

/* ----------------------------------------
   Font Toggle (Sans / Serif)
   ---------------------------------------- */

/* Move indicator to right when in serif mode */
html.serif-mode #font-mode-toggle .display-toggle-indicator {
    transform: translateX(calc(100% + 2px));
}

/* Serif mode: apply serif font to model outputs only */
html.serif-mode .message-content {
    font-family: var(--font-serif);
    font-size: 14px;
}

/* Bold for serif mode (PT Serif uses 400/700) */
html.serif-mode .message-content strong,
html.serif-mode .message-content b {
    font-weight: 700;
}

/* Exclude reasoning trace from serif font */
html.serif-mode .reasoning-trace {
    font-family: var(--font-sans);
}

/* Exclude share preview from serif font */
html.serif-mode .share-preview-content {
    font-family: var(--font-sans);
    font-size: inherit;
}

/* ----------------------------------------
   Theme Toggle (3-way Segmented Control)
   Light / Dark / System
   ---------------------------------------- */

.theme-toggle-container {
    display: flex;
    position: relative;
    background: hsl(var(--color-muted) / 0.6);
    border-radius: 0.5rem;
    padding: 3px;
    gap: 2px;
}

/* Sliding indicator for 3-way toggle (1/3 width) */
.theme-toggle-indicator {
    position: absolute;
    top: 3px;
    left: 3px;
    width: calc(33.333% - 3px);
    height: calc(100% - 6px);
    background: hsl(var(--color-background) / 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 0.375rem;
    box-shadow: 0 1px 3px hsl(0 0% 0% / 0.1), 0 1px 2px hsl(0 0% 0% / 0.06);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.dark #settings-menu .theme-toggle-indicator,
.dark #welcome-theme-toggle .theme-toggle-indicator {
    background: hsl(0 0% 22% / 0.96);
    box-shadow: 0 1px 2px hsl(0 0% 0% / 0.18);
}

/* Indicator positions based on data attribute set by JS */
/* Default position (system) when no data-theme or data-theme="system" */
.theme-toggle-indicator {
    transform: translateX(calc(200% + 4px));
}

.theme-toggle-container[data-theme="light"] .theme-toggle-indicator {
    transform: translateX(0);
}

.theme-toggle-container[data-theme="dark"] .theme-toggle-indicator {
    transform: translateX(calc(100% + 2px));
}

.theme-toggle-container[data-theme="system"] .theme-toggle-indicator {
    transform: translateX(calc(200% + 4px));
}

/* Toggle buttons */
.theme-toggle-btn {
    flex: 1;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.4rem 0.55rem;
    border-radius: 0.375rem;
    color: hsl(var(--color-muted-foreground));
    transition: color 0.2s ease;
    cursor: pointer;
    background: transparent;
    border: none;
}

.theme-toggle-btn:hover {
    color: hsl(var(--color-foreground));
}

.theme-toggle-btn[aria-checked="true"] {
    color: hsl(var(--color-foreground));
}

/* ----------------------------------------
   Reasoning Effort Toggle (4-way Segmented Control)
   Low / Medium / High / Heavy
   ---------------------------------------- */

.reasoning-effort-toggle .theme-toggle-indicator {
    width: calc(25% - 3.5px);
}

.reasoning-effort-toggle[data-effort="low"] .theme-toggle-indicator {
    transform: translateX(0);
}

.reasoning-effort-toggle[data-effort="medium"] .theme-toggle-indicator {
    transform: translateX(calc(100% + 2px));
}

.reasoning-effort-toggle[data-effort="high"] .theme-toggle-indicator {
    transform: translateX(calc(200% + 4px));
}

.reasoning-effort-toggle[data-effort="xhigh"] .theme-toggle-indicator {
    transform: translateX(calc(300% + 6px));
}

.reasoning-effort-btn {
    padding: 0.4rem 0.35rem;
    color: hsl(var(--color-foreground) / 0.88);
}

.reasoning-effort-btn:hover {
    color: hsl(var(--color-foreground));
}

.reasoning-effort-btn[aria-checked="true"] {
    color: hsl(var(--color-foreground));
}

.dark .reasoning-effort-btn {
    color: hsl(var(--color-foreground) / 0.72);
}

.dark .reasoning-effort-btn:hover {
    color: hsl(var(--color-foreground) / 0.9);
}

.dark .reasoning-effort-btn[aria-checked="true"] {
    color: hsl(var(--color-foreground));
}

.reasoning-effort-btn svg {
    display: block;
    width: 1.05rem;
    height: 1.05rem;
    stroke-width: 2.2;
}

.reasoning-effort-btn .effort-muted {
    opacity: 0.5;
}

.reasoning-effort-toggle.is-disabled {
    opacity: 0.55;
}

.reasoning-effort-toggle.is-disabled .reasoning-effort-btn {
    pointer-events: none;
}

/* Flat mode - Assistant messages: remove bubble, keep text */
html.flat-mode .message-assistant {
    background-color: transparent;
    border: none;
    border-radius: 0;
    padding-top: 0; /* Remove top padding so content stays at same position as bubble mode */
    padding-left: 0.5rem; /* Small left padding for alignment with header */
    padding-right: 0;
}

/* Flat mode - User messages: gray bubble instead of blue */
html.flat-mode .message-user {
    background-color: var(--slate-2);
    border: 1px solid var(--slate-4);
    color: hsl(var(--color-foreground));
}

/* Flat mode - Update collapsed user message gradient for gray background */
html.flat-mode .user-message-collapsible.collapsed::after {
    background: linear-gradient(to bottom, transparent 0%, var(--slate-2) 100%);
}

/* Flat mode - Show more button uses foreground color instead of white */
html.flat-mode .user-message-show-more {
    color: hsl(var(--color-muted-foreground));
}

html.flat-mode .user-message-show-more:hover {
    color: hsl(var(--color-foreground));
}

/* File attachment cards in user messages */
.file-attachment-card {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.file-attachment-card:hover {
    background: rgba(255, 255, 255, 0.25);
}

.file-attachment-icon {
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.dark .file-attachment-card {
    background: rgba(255, 255, 255, 0.06) !important;
    border: 1px solid rgba(255, 255, 255, 0.3) !important;
}

.dark .file-attachment-card:hover {
    background: rgba(255, 255, 255, 0.1) !important;
}

.dark .file-attachment-icon {
    background: rgba(255, 255, 255, 0.15) !important;
    border: 1px solid rgba(255, 255, 255, 0.25) !important;
}

/* Brighter PDF icon in dark mode for better visibility */
.dark .file-attachment-icon .text-destructive {
    color: hsl(0 72% 55%) !important;
}

/* Flat mode - file attachments need darker boundaries on gray bubble */
html.flat-mode .file-attachment-card {
    background: rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(0, 0, 0, 0.12);
}

html.flat-mode .file-attachment-card:hover {
    background: rgba(0, 0, 0, 0.08);
}

html.flat-mode .file-attachment-icon {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0, 0, 0, 0.08);
}

/* Dark + flat mode: use dark styles with better icon visibility */
html.flat-mode.dark .file-attachment-icon {
    background: rgba(255, 255, 255, 0.12) !important;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
}

html.flat-mode.dark .file-attachment-icon .text-destructive {
    color: hsl(0 72% 55%) !important;
}

.prose p:first-child {
    margin-top: 0;
}

.prose p:last-child {
    margin-bottom: 0;
}

/* First heading in a message should have less top margin */
.prose > h1:first-child,
.prose > h2:first-child,
.prose > h3:first-child,
.prose > h4:first-child {
    margin-top: 0;
}

/* Table styles */
.prose table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 0.75rem;
    font-size: 0.8125rem;
}

.prose table th,
.prose table td {
    border: 1px solid hsl(var(--color-border));
    padding: 0.5rem;
    text-align: left;
}

.prose table th {
    background-color: hsl(var(--color-muted));
    font-weight: 600;
}

/* Hide scrollbar when not hovering */
.overflow-y-auto::-webkit-scrollbar {
    width: 8px;
}

.overflow-y-auto::-webkit-scrollbar-track {
    background: transparent;
}

.overflow-y-auto::-webkit-scrollbar-thumb {
    background: transparent;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.overflow-y-auto:hover::-webkit-scrollbar-thumb,
.scrolling::-webkit-scrollbar-thumb {
    background: var(--slate-6);
}

/* Activity Log Timeline Styles */
.activity-log-entry.new-entry {
    animation: slideInFromBottom 0.3s ease-out;
}

@keyframes slideInFromBottom {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.activity-log-header:hover .activity-node {
    transform: scale(1.3);
}

.activity-log-entry:hover .activity-node {
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.activity-log-details {
    animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
        max-height: 0;
    }
    to {
        opacity: 1;
        transform: translateY(0);
        max-height: 300px;
    }
}

/* Legacy Network Log Styles (for compatibility) */
.network-log-entry {
    transition: all 0.2s ease;
}

.network-log-header:hover {
    background-color: hsl(var(--color-accent));
}

.network-log-details {
    animation: expandLog 0.2s ease-out;
}

@keyframes expandLog {
    from {
        opacity: 0;
        max-height: 0;
    }
    to {
        opacity: 1;
        max-height: 500px;
    }
}

/* Network log status badges */
.bg-blue-500 {
    background-color: #3b82f6;
}

.bg-purple-500 {
    background-color: #a855f7;
}

.bg-green-500 {
    background-color: #22c55e;
}

/* Status indicator classes - for active/online/connected states */
.bg-status-success {
    background-color: var(--color-status-success);
}

.text-status-success {
    color: var(--color-status-success);
}

.dark .text-status-success {
    color: #6DB88E; /* Lighter shade for dark mode */
}

/* Status badge classes - for pill/badge style indicators */
.badge-status-success {
    background-color: rgba(73, 137, 102, 0.15);
    color: #366B4D; /* Darker shade for text */
}

.dark .badge-status-success {
    background-color: rgba(73, 137, 102, 0.25);
    color: #6DB88E; /* Lighter shade for dark mode */
}

/* Status success opacity variants for backgrounds and borders */
.bg-status-success\/10 {
    background-color: rgba(73, 137, 102, 0.1);
}

.bg-status-success\/15 {
    background-color: rgba(73, 137, 102, 0.15);
}

.border-status-success\/30 {
    border-color: rgba(73, 137, 102, 0.3);
}

.bg-gray-500 {
    background-color: #6b7280;
}

.bg-red-500 {
    background-color: #ef4444;
}

.text-green-600 {
    color: #16a34a;
}

.text-red-600 {
    color: #dc2626;
}

.text-orange-600 {
    color: #ea580c;
}

.text-gray-600 {
    color: #4b5563;
}

/* Network logs container scrollbar */
#network-logs-container {
    scrollbar-width: thin;
    scrollbar-color: var(--slate-6) transparent;
}

#network-logs-container::-webkit-scrollbar {
    width: 6px;
}

#network-logs-container::-webkit-scrollbar-track {
    background: transparent;
}

#network-logs-container::-webkit-scrollbar-thumb {
    background: var(--slate-6);
    border-radius: 3px;
}

#network-logs-container::-webkit-scrollbar-thumb:hover {
    background: var(--slate-4);
}

/* Utility classes for opacity */
.opacity-50 {
    opacity: 0.5;
}

.opacity-60 {
    opacity: 0.6;
}

/* Breathing dot animation */
.breathing-dot {
    animation: breathe 2s ease-in-out infinite;
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4);
}

.breathing-dot.status-active {
    background-color: var(--color-status-success);
    box-shadow: 0 0 0 0 rgba(73, 137, 102, 0.4);
}

.breathing-dot.status-inactive {
    background-color: #ef4444;
    box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4);
}

@keyframes breathe {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 currentColor;
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 6px rgba(0, 0, 0, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
    }
}

/* ============================================
   RESPONSIVE LAYOUT SYSTEM
   ============================================
   Breakpoints (mobile-first):
   - Base: < 640px  (mobile)
   - sm:  >= 640px  (tablet)
   - lg:  >= 1024px (desktop)

   Behavior:
   - Mobile:  Sidebar overlay, Right panel overlay, input buttons collapsed
   - Tablet:  Sidebar toggleable, Right panel overlay
   - Desktop: Both panels can be inline
   ============================================ */

/* --- Core Layout Constraints --- */
html {
    height: 100%;
    height: -webkit-fill-available; /* iOS Safari fallback */
    height: 100dvh; /* Dynamic viewport height for mobile address bar */
    overflow: hidden;
    overscroll-behavior: none; /* Prevent bounce/overscroll */
}

body {
    height: 100%;
    height: -webkit-fill-available;
    height: 100dvh;
    overflow: hidden;
    overscroll-behavior: none;
    /* Prevent iOS rubber-band scrolling on body */
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
}

#app {
    min-width: 320px;
    height: 100%;
    height: -webkit-fill-available;
    height: 100dvh;
    overflow: hidden;
}

/* --- Sidebar Base & Hidden State --- */
#sidebar {
    --sidebar-open-duration: 280ms;
    --sidebar-close-duration: 220ms;
    --sidebar-open-ease: cubic-bezier(0.22, 1, 0.36, 1);
    --sidebar-close-ease: cubic-bezier(0.4, 0, 1, 1);
    transition-property: width, border-right-width;
    transition-duration: var(--sidebar-open-duration), var(--sidebar-open-duration);
    transition-timing-function: var(--sidebar-open-ease), var(--sidebar-open-ease);
}

.sidebar-resize-handle {
    position: absolute;
    top: 0;
    right: -4px;
    width: 8px;
    height: 100%;
    cursor: col-resize;
    z-index: 20;
    touch-action: none;
}

.sidebar-resize-handle::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 3px;
    width: 2px;
    background: hsl(var(--color-border));
    opacity: 0;
    transition: opacity 0.15s ease;
}

.sidebar-resize-handle:hover::before,
body.sidebar-resizing .sidebar-resize-handle::before {
    opacity: 0.75;
}

body.sidebar-resizing {
    cursor: col-resize;
    user-select: none;
}

body.sidebar-resizing #sidebar {
    transition: none !important;
}

#sidebar.sidebar-hidden {
    width: 0 !important;
    border-right-width: 0 !important;
    transition-duration: var(--sidebar-close-duration), var(--sidebar-close-duration);
    transition-timing-function: var(--sidebar-close-ease), var(--sidebar-close-ease);
}

html[data-left-sidebar-hidden="true"] #sidebar {
    width: 0 !important;
    border-right-width: 0 !important;
}

html[data-left-sidebar-hidden="true"]:not([data-left-sidebar-closing="true"]) #show-sidebar-btn {
    display: flex !important;
}

html[data-left-sidebar-closing="true"] #sidebar [data-tooltip]:hover::after,
html[data-left-sidebar-closing="true"] #sidebar [data-tooltip]:hover::before {
    display: none !important;
}

.sidebar-toggle-btn {
    position: relative;
}

.sidebar-toggle-tooltip {
    position: absolute;
    top: 100%;
    left: 50%;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transform: translateX(-50%) translateY(8px);
    background-color: hsl(var(--color-popover));
    color: hsl(var(--color-popover-foreground));
    border: 1px solid hsl(var(--color-border));
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1;
    white-space: nowrap;
    z-index: 9999;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
}

.sidebar-toggle-tooltip-right {
    left: auto;
    right: 0;
    transform: translateY(8px);
}

.sidebar-toggle-tooltip::before {
    content: '';
    position: absolute;
    top: -5px;
    left: 50%;
    width: 8px;
    height: 8px;
    background-color: hsl(var(--color-popover));
    border-top: 1px solid hsl(var(--color-border));
    border-left: 1px solid hsl(var(--color-border));
    transform: translateX(-50%) rotate(45deg);
    pointer-events: none;
}

.sidebar-toggle-tooltip-right::before {
    left: auto;
    right: 14px;
    transform: rotate(45deg);
}

.sidebar-toggle-shortcut {
    display: inline-flex;
    align-items: center;
    gap: 0.125rem;
    color: hsl(var(--color-muted-foreground));
    font-size: 0.75rem;
}

.sidebar-toggle-shortcut span {
    opacity: 0.6;
}

@media (hover: hover) and (pointer: fine) {
    .sidebar-toggle-btn:hover .sidebar-toggle-tooltip,
    .sidebar-toggle-btn:focus-visible .sidebar-toggle-tooltip {
        opacity: 1;
        visibility: visible;
        animation: tooltipBodyFadeIn 0.15s ease-out;
    }

    .sidebar-toggle-btn:hover .sidebar-toggle-tooltip-right,
    .sidebar-toggle-btn:focus-visible .sidebar-toggle-tooltip-right {
        animation: tooltipBodyFadeInRight 0.15s ease-out;
    }
}

.dark .sidebar-toggle-tooltip {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    background-color: hsl(var(--color-popover));
}

.dark .sidebar-toggle-tooltip::before {
    background-color: hsl(var(--color-popover));
}

html[data-left-sidebar-closing="true"] #sidebar .sidebar-toggle-tooltip {
    opacity: 0 !important;
    visibility: hidden !important;
    animation: none !important;
}

/* Chat Toolbar - fixed at top of main content area */
.chat-toolbar {
    min-height: 3rem; /* pt-2 (8px) + h-9 (36px) + pb-1 (4px) = 48px */
    z-index: 30;
    background-color: hsl(var(--color-background));
    border-bottom: 1px solid transparent;
    /* Fast background transition so overlay appears quickly when screen narrows */
    transition: border-color 0.15s ease, min-height 0.2s ease, background-color 0.1s ease;
    overflow: hidden; /* Prevent any content overflow */
}

/* Mobile toolbar divider - simple horizontal line below toolbar (JS controls visibility) */
#mobile-toolbar-divider {
    display: none; /* JS toggles to 'block' when scrolled on mobile */
    height: 1px;
    background-color: rgba(0, 0, 0, 0.12);
    flex-shrink: 0;
}

/* Dark mode divider */
.dark #mobile-toolbar-divider,
:root.dark #mobile-toolbar-divider {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Desktop toolbar: ALWAYS absolute position to prevent layout jumps */
/* Only visual properties (background, border) change based on screen width */
@media (min-width: 768px) {
    .chat-toolbar {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
    }

    /* CRITICAL: Fixed padding that NEVER changes - prevents layout jumps */
    #chat-area {
        padding-top: 48px; /* Always reserve space for toolbar height */
    }
}

/* Wide screen mode: transparent toolbar, content visible behind buttons */
.chat-toolbar.toolbar-wide {
    background-color: transparent;
    border-bottom-color: transparent !important;
    pointer-events: none; /* Allow clicks through transparent areas */
}

.chat-toolbar.toolbar-wide > * {
    pointer-events: auto; /* But buttons remain clickable */
}

/* Keep toolbar button geometry stable even when right-panel toggle is hidden */
#show-right-panel-btn {
    display: inline-flex;
    width: 0;
    min-width: 0;
    max-width: 0;
    padding-left: 0;
    padding-right: 0;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    overflow: hidden;
    transition: width 0.26s cubic-bezier(0.4, 0, 0.2, 1),
        max-width 0.26s cubic-bezier(0.4, 0, 0.2, 1),
        opacity 0.2s ease,
        visibility 0s linear 0.26s;
}

#show-right-panel-btn.system-panel-toggle-visible,
html[data-right-panel-hidden="true"] #show-right-panel-btn {
    width: 2.25rem;
    min-width: 2.25rem;
    max-width: 2.25rem;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition-delay: 0s;
}

/* Show right panel button on mobile too (panel is overlay on narrow screens). */

/* Divider appears when scrolled AND content overlaps with toolbar */
.chat-toolbar.toolbar-divider-visible {
    border-bottom-color: hsl(var(--color-border));
}

/* --- Mobile Sidebar Backdrop --- */
.mobile-sidebar-backdrop {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 35;
    display: none;
}

.mobile-sidebar-backdrop.visible {
    display: block;
}

/* --- Right Panel Base --- */
:root {
    --system-panel-width: 18rem;
    --system-panel-open-duration: 280ms;
    --system-panel-close-duration: 220ms;
    --system-panel-open-ease: cubic-bezier(0.22, 1, 0.36, 1);
    --system-panel-close-ease: cubic-bezier(0.4, 0, 1, 1);
}

#right-panel {
    width: var(--system-panel-width);
    min-width: 0;
    max-width: var(--system-panel-width);
    flex-shrink: 0;
    overflow: hidden;
    will-change: width, transform;
    transition-property: width, border-left-width, transform;
    transition-duration: var(--system-panel-open-duration), var(--system-panel-open-duration), var(--system-panel-open-duration);
    transition-timing-function: var(--system-panel-open-ease), var(--system-panel-open-ease), var(--system-panel-open-ease);
}

#right-panel-content {
    width: var(--system-panel-width);
    min-width: var(--system-panel-width);
    max-width: var(--system-panel-width);
    transform: translateX(0);
    transition-property: transform;
    transition-duration: var(--system-panel-open-duration);
    transition-timing-function: var(--system-panel-open-ease);
    will-change: transform;
}

html[data-right-panel-hidden="true"] #right-panel {
    transition-duration: var(--system-panel-close-duration), var(--system-panel-close-duration), var(--system-panel-close-duration);
    transition-timing-function: var(--system-panel-close-ease), var(--system-panel-close-ease), var(--system-panel-close-ease);
}

html[data-right-panel-hidden="true"] #right-panel #right-panel-content {
    transition-duration: var(--system-panel-close-duration);
    transition-timing-function: var(--system-panel-close-ease);
}

@media (max-width: 1023px) {
    #right-panel {
        position: fixed !important;
        right: 0;
        top: 0;
        transform: translateX(0);
    }

    html[data-right-panel-hidden="true"] #right-panel {
        transform: translateX(100%);
        border-left-width: 0;
        pointer-events: none;
    }

    html[data-right-panel-hidden="true"] #right-panel #right-panel-content {
        transform: translateX(0);
    }
}

@media (min-width: 1024px) {
    #right-panel {
        position: relative !important;
        transform: translateX(0);
    }

    html[data-right-panel-hidden="true"] #right-panel {
        width: 0;
        border-left-width: 0;
        pointer-events: none;
    }

    html[data-right-panel-hidden="true"] #right-panel #right-panel-content {
        transform: translateX(100%);
    }
}

/* --- Mobile: < 640px --- */
@media (max-width: 639px) {
    .sidebar-resize-handle {
        display: none;
    }

    /* Sidebar: always overlay mode */
    #sidebar:not(.mobile-visible) {
        position: fixed !important;
        left: 0;
        top: 0;
        z-index: 40;
        width: 0 !important;
        border-right-width: 0 !important;
        overflow: hidden !important;
    }

    #sidebar.mobile-visible {
        position: fixed !important;
        left: 0;
        top: 0;
        z-index: 40;
        width: 16rem !important;
        border-right-width: 1px !important;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
        overflow: hidden !important;
    }

    /* Always show sidebar toggle on mobile */
    #show-sidebar-btn {
        display: flex !important;
    }

    /* Hide keyboard shortcuts on mobile (⌘K) - saves space without losing functionality */
    #model-picker-btn .flex.items-center.gap-0\.5 {
        display: none;
    }

    #scrubber-shortcut-hint {
        display: none;
    }

    /* Progressive model name truncation:
       Hide provider name first (e.g., "OpenAI: " disappears), keep model name */
    #model-picker-btn .model-provider-name {
        display: none;
    }

    /* Model name can shrink but stays readable */
    #model-picker-btn .model-short-name {
        max-width: 150px;
    }
}

/* --- Extremely narrow screens (< 360px) - only then hide secondary buttons --- */
@media (max-width: 359px) {
    #file-upload-btn {
        display: none !important;
    }

    #model-picker-btn .model-short-name {
        max-width: 100px;
    }
}

/* --- Mobile layout (< 640px) - continued: fixed input and scroll fix --- */
@media (max-width: 639px) {
    /* CRITICAL: Input card fixed at viewport bottom on mobile
       This ensures input is ALWAYS visible regardless of content height */
    #input-card {
        position: fixed !important;
        /* Account for iOS safe area (home indicator) */
        bottom: calc(0.5rem + env(safe-area-inset-bottom, 0px)) !important;
        left: 0.5rem !important;
        right: 0.5rem !important;
        width: auto !important;
        max-width: none !important;
        z-index: 50 !important;
    }

    /* ===========================================
       MOBILE SCROLL FIX FOR iOS

       Use absolute positioning for chat area to ensure it fills
       exactly the available space and scrolls properly.
       =========================================== */

    /* Main content area - use flexbox for proper layout */
    main {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        padding-top: 0 !important;
        display: flex !important;
        flex-direction: column !important;
    }

    /* Hide the flex container wrapper - we position chat-area directly */
    main > div.flex {
        display: contents !important;
    }

    /* Chat toolbar - ensure it's visible and positioned correctly on mobile */
    #chat-toolbar {
        display: flex !important;
        flex-wrap: nowrap !important; /* Prevent toolbar items from wrapping to new row */
        position: relative !important;
        flex-shrink: 0 !important;
        z-index: 30;
        background-color: hsl(var(--color-background)) !important; /* Always solid on mobile */
    }


    /* Ensure buttons maintain proper size on mobile */
    #chat-toolbar button {
        min-width: 2.25rem !important; /* 36px = h-9 */
        min-height: 2.25rem !important;
    }

    /* Chat area - fill remaining space below toolbar using flex */
    #chat-area {
        position: relative !important;
        flex: 1 !important;
        min-height: 0 !important; /* Allow flex child to shrink */
        /* Space for fixed input card + safe area */
        margin-bottom: calc(5rem + env(safe-area-inset-bottom, 0px)) !important;
        overflow-y: scroll !important;
        -webkit-overflow-scrolling: touch !important;
        overscroll-behavior-y: contain !important;
        /* Hide scrollbar on mobile for cleaner look */
        scrollbar-width: none; /* Firefox */
        -ms-overflow-style: none; /* IE/Edge */
    }

    /* Hide scrollbar on mobile - WebKit (Chrome, Safari, newer Edge) */
    #chat-area::-webkit-scrollbar {
        display: none;
    }

    /* Messages container padding */
    #messages-container {
        padding-bottom: 2rem !important;
        padding-top: 1rem !important;
    }
}

/* --- Small Tablet: 640px to 767px (sidebar overlay, right panel overlay) --- */
@media (min-width: 640px) and (max-width: 767px) {
    .sidebar-resize-handle {
        display: none;
    }

    #sidebar:not(.mobile-visible) {
        position: fixed !important;
        left: 0;
        top: 0;
        z-index: 40;
        width: 0 !important;
        border-right-width: 0 !important;
        overflow: hidden !important;
    }

    #sidebar.mobile-visible {
        position: fixed !important;
        left: 0;
        top: 0;
        z-index: 40;
        width: 16rem !important;
        border-right-width: 1px !important;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
        overflow: hidden !important;
    }

    #show-sidebar-btn {
        display: flex !important;
    }

    /* Hide keyboard shortcuts */
    #model-picker-btn .flex.items-center.gap-0\.5 {
        display: none;
    }

    /* Input card fixed at bottom */
    #input-card {
        position: fixed !important;
        bottom: 0.5rem !important;
        left: 0.5rem !important;
        right: 0.5rem !important;
        width: auto !important;
        max-width: none !important;
        z-index: 50 !important;
    }

    /* Scroll fix - same as mobile, use flexbox */
    main {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        padding-top: 0 !important;
        display: flex !important;
        flex-direction: column !important;
    }

    main > div.flex {
        display: contents !important;
    }

    /* Chat toolbar positioning for small tablet */
    #chat-toolbar {
        display: flex !important;
        flex-wrap: nowrap !important; /* Prevent toolbar items from wrapping to new row */
        position: relative !important;
        flex-shrink: 0 !important;
        z-index: 30;
        background-color: hsl(var(--color-background)) !important;
    }


    /* Ensure buttons maintain proper size */
    #chat-toolbar button {
        min-width: 2.25rem !important;
        min-height: 2.25rem !important;
    }

    #chat-area {
        position: relative !important;
        flex: 1 !important;
        min-height: 0 !important;
        margin-bottom: 5rem !important;
        overflow-y: scroll !important;
        -webkit-overflow-scrolling: touch !important;
        overscroll-behavior-y: contain !important;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    #chat-area::-webkit-scrollbar {
        display: none;
    }

    #messages-container {
        padding-bottom: 2rem !important;
        padding-top: 1rem !important;
    }
}

/* --- Large Tablet: 768px to 1023px (sidebar inline, right panel overlay) --- */
@media (min-width: 768px) and (max-width: 1023px) {
    #sidebar:not(.sidebar-hidden) {
        width: var(--oa-left-sidebar-width, 220px);
        border-right-width: 1px;
    }

    /* Hide mobile backdrop */
    .mobile-sidebar-backdrop {
        display: none !important;
    }

    /* Input card - can use normal positioning here since sidebar is inline */
    /* But keep consistent with tablet behavior for smooth transitions */
}

/* --- Desktop: >= 1024px --- */
@media (min-width: 1024px) {
    /* Sidebar: inline mode */
    #sidebar:not(.sidebar-hidden) {
        width: var(--oa-left-sidebar-width, 220px);
        border-right-width: 1px;
    }

    /* Hide mobile backdrop */
    .mobile-sidebar-backdrop {
        display: none !important;
    }

    /* Right panel desktop positioning and transitions are handled in base rules */
}

/* Message Navigation Styles */
.message-navigation {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    right: 12px;
    z-index: 30;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 5px 3px;
    background: hsl(var(--color-card) / 0.7);
    backdrop-filter: saturate(120%) blur(var(--glass-blur));
    -webkit-backdrop-filter: saturate(120%) blur(var(--glass-blur));
    border-radius: 10px;
    border: 1px solid hsl(var(--color-border) / 0.5);
    box-shadow: 0 4px 12px -2px rgb(0 0 0 / 0.08);
    opacity: 0.4;
    transition: opacity 0.2s ease, right 0.3s ease;
}

.message-navigation:hover {
    opacity: 1;
}

.dark .message-navigation {
    background: hsl(var(--color-card) / 0.6);
    box-shadow: 0 4px 12px -2px rgb(0 0 0 / 0.3);
}

/* Mobile: tighter positioning */
@media (max-width: 639px) {
    .message-navigation {
        right: 6px;
    }
}

/* Desktop: adjust for inline right panel */
@media (min-width: 1024px) {
    .right-panel-open .message-navigation {
        right: calc(12px + 288px);
    }
}

.message-navigation.hidden {
    display: none;
}

.nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 14px;
    height: 14px;
    background: transparent;
    border: none;
    border-radius: 3px;
    color: hsl(var(--color-muted-foreground));
    cursor: pointer;
    transition: all 0.15s ease;
    padding: 0;
}

.nav-btn:hover {
    color: hsl(var(--color-foreground));
    background: hsl(var(--color-foreground) / 0.1);
}

.nav-btn:active {
    transform: scale(0.9);
}

.nav-btn svg {
    width: 8px;
    height: 8px;
}

.message-indicators {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    max-height: 180px;
    overflow-y: auto;
    scrollbar-width: none;
    padding: 1px 0;
}

.message-indicators::-webkit-scrollbar {
    display: none;
}

.message-indicator {
    width: 4px;
    min-height: 3px;
    background: hsl(var(--color-foreground) / 0.2);
    border: none;
    border-radius: 2px;
    cursor: pointer;
    transition: all 0.15s ease;
    padding: 0;
    flex-shrink: 0;
}

.message-indicator:hover {
    background: hsl(var(--color-foreground) / 0.5);
    transform: scaleX(1.4);
}

.message-indicator.active {
    background: hsl(var(--color-accent-primary));
}

/* Message Preview Popover */
.message-preview-popover {
    position: fixed;
    max-width: 320px;
    background: hsl(var(--color-popover));
    border: 1px solid hsl(var(--color-border));
    border-radius: 10px;
    box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.12), 0 2px 8px -2px rgba(0, 0, 0, 0.08);
    z-index: 35; /* Above message navigation (z-30) but below right panel (z-40) */
    animation: popoverFadeIn 0.15s ease-out;
    pointer-events: auto;
}

.dark .message-preview-popover {
    box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.4), 0 2px 8px -2px rgba(0, 0, 0, 0.3);
}

.popover-header {
    font-size: 0.75rem;
    font-weight: 300;
    color: hsl(var(--color-muted-foreground));
    padding: 10px 14px 8px;
    border-bottom: 1px solid hsl(var(--color-border));
    letter-spacing: 0.03em;
}

.popover-content {
    font-size: 0.8125rem;
    color: hsl(var(--color-popover-foreground));
    padding: 12px 14px;
    line-height: 1.5;
    word-wrap: break-word;
    max-height: 200px;
    overflow-y: auto;
}

/* Prose overrides for popover preview */
.popover-content.prose {
    font-size: 0.8125rem;
}

.popover-content.prose p {
    margin: 0.25em 0;
}

.popover-content.prose pre {
    font-size: 0.75rem;
    padding: 0.5em;
    margin: 0.5em 0;
    overflow-x: auto;
}

.popover-content.prose code {
    font-size: 0.75rem;
}

.popover-content.prose strong {
    font-weight: 600;
}

/* Share preview content (compact markdown in modal) */
.share-preview-content {
    font-size: inherit;
    line-height: 1.4;
}

.share-preview-content p {
    margin: 0;
    display: inline;
}

.share-preview-content h1,
.share-preview-content h2,
.share-preview-content h3,
.share-preview-content h4,
.share-preview-content h5,
.share-preview-content h6 {
    font-size: inherit;
    font-weight: 600;
    margin: 0;
    display: inline;
}

.share-preview-content pre,
.share-preview-content code {
    font-size: 0.9em;
    padding: 0 0.2em;
    background: hsl(var(--color-muted));
    border-radius: 3px;
}

.share-preview-content pre {
    display: inline;
    white-space: pre-wrap;
}

.share-preview-content ul,
.share-preview-content ol {
    margin: 0;
    padding-left: 1em;
    display: inline;
}

.share-preview-content li {
    display: inline;
}

.share-preview-content li::before {
    content: '• ';
}

.share-preview-content .katex {
    font-size: 0.9em;
}

@keyframes popoverFadeIn {
    from {
        opacity: 0;
        transform: translateY(-50%) translateX(8px);
    }
    to {
        opacity: 1;
        transform: translateY(-50%) translateX(0);
    }
}

/* ----------------------------------------
   Switch Toggle (iOS-style)
   Used by: reasoning toggle, proxy toggle
   ---------------------------------------- */

.switch-toggle {
    position: relative;
    width: 2rem; /* w-8 */
    height: 18px;
    border-radius: 9999px;
    transition: background-color 0.2s ease;
    cursor: pointer;
}

.switch-toggle:disabled {
    opacity: 0.7;
    cursor: pointer; /* Keep pointer cursor during animation, not wait cursor */
    pointer-events: none; /* Prevent clicks without changing cursor */
}

[data-memory-requires-feature]:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

[data-memory-requires-feature]:disabled:hover {
    color: hsl(var(--color-muted-foreground));
    background: transparent;
}

.switch-toggle-indicator {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px; /* w-3.5 */
    height: 14px; /* h-3.5 */
    border-radius: 9999px;
    background: white;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Active state - slide indicator to right */
.switch-toggle.switch-active .switch-toggle-indicator {
    transform: translateX(14px); /* Move by (toggle-width - indicator-width - padding) = 32 - 14 - 4 = 14px */
}

/* Background colors */
.switch-toggle.switch-inactive {
    background-color: hsl(var(--color-muted-foreground) / 0.3);
}

.switch-toggle.switch-active {
    background-color: #3b82f6; /* bg-blue-500 */
}

.switch-toggle.switch-toggle-sm {
    width: 1.75rem;
    height: 16px;
}

.switch-toggle.switch-toggle-sm .switch-toggle-indicator {
    top: 2px;
    left: 2px;
    width: 12px;
    height: 12px;
}

.switch-toggle.switch-toggle-sm.switch-active .switch-toggle-indicator {
    transform: translateX(12px);
}

/* Search toggle active state */
/* Search toggle uses accent-primary */
#search-toggle.search-active {
    color: hsl(var(--color-accent-primary)) !important;
    background-color: hsl(var(--color-accent-primary) / 0.1) !important;
}

#search-toggle.search-active:hover {
    background-color: hsl(var(--color-accent-primary) / 0.15) !important;
}

.dark #search-toggle.search-active {
    color: hsl(var(--color-accent-primary) / 0.85) !important;
    background-color: hsl(var(--color-accent-primary) / 0.2) !important;
}

.dark #search-toggle.search-active:hover {
    background-color: hsl(var(--color-accent-primary) / 0.25) !important;
}

.chat-mode-toggle-container {
    display: flex;
    position: relative;
    background: hsl(var(--color-muted) / 0.6);
    border-radius: 0.5rem;
    padding: 2px;
    gap: 1px;
    height: 28px;
}

.chat-mode-toggle-indicator {
    position: absolute;
    top: 2px;
    left: 2px;
    width: calc(50% - 2.5px);
    height: calc(100% - 4px);
    background: hsl(var(--color-background) / 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 0.375rem;
    box-shadow: 0 1px 3px hsl(0 0% 0% / 0.1), 0 1px 2px hsl(0 0% 0% / 0.06);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.dark .chat-mode-toggle-indicator {
    background: hsl(0 0% 22% / 0.96);
    box-shadow: 0 1px 2px hsl(0 0% 0% / 0.18);
}

.chat-mode-toggle-container[data-mode="chat"] .chat-mode-toggle-indicator {
    transform: translateX(0);
}

.chat-mode-toggle-container[data-mode="memory"] .chat-mode-toggle-indicator {
    transform: translateX(calc(100% + 1px));
}

.chat-mode-toggle-container.is-disabled {
    background: hsl(var(--color-muted) / 0.45);
}

.chat-mode-toggle-container.is-disabled .chat-mode-toggle-indicator {
    transform: translateX(0);
}

.chat-mode-toggle-btn {
    position: relative;
    flex: 1;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
    height: 100%;
    padding: 0 0.45rem;
    border-radius: 0.375rem;
    color: hsl(var(--color-muted-foreground));
    transition: color 0.2s ease;
    cursor: pointer;
    background: transparent;
    border: none;
    line-height: 1;
}

.chat-mode-toggle-btn svg {
    flex-shrink: 0;
}

.chat-mode-toggle-btn:hover {
    color: hsl(var(--color-foreground));
}

.chat-mode-toggle-btn[aria-checked="true"] {
    color: hsl(var(--color-foreground));
}

.chat-mode-toggle-container.is-disabled .chat-mode-toggle-btn[data-mode-option="memory"] {
    cursor: not-allowed;
    opacity: 0.55;
}

.chat-mode-toggle-container.is-disabled .chat-mode-toggle-btn[data-mode-option="memory"]:hover {
    color: hsl(var(--color-muted-foreground));
    background: transparent;
    box-shadow: none;
}

.chat-mode-toggle-container.is-disabled .chat-mode-toggle-btn[data-mode-option="chat"] {
    cursor: default;
}

.chat-mode-toggle-container:not(.sliding) .chat-mode-toggle-btn[data-mode-option="memory"][aria-checked="true"]:hover {
    background-color: hsl(var(--color-hover));
    box-shadow: inset 0 0 0 1px hsl(var(--color-foreground) / 0.15);
}

.chat-mode-html-tooltip {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    background-color: hsl(var(--color-popover));
    color: hsl(var(--color-popover-foreground));
    border: 1px solid hsl(var(--color-border));
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    white-space: nowrap;
    z-index: 9999;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    pointer-events: none;
    align-items: center;
    gap: 4px;
}

.chat-mode-html-tooltip::before {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    width: 8px;
    height: 8px;
    background-color: hsl(var(--color-popover));
    border: none;
    border-bottom: 1px solid hsl(var(--color-border));
    border-right: 1px solid hsl(var(--color-border));
    transform: translateX(-50%) translateY(-4px) rotate(45deg);
    z-index: 10000;
}

.dark .chat-mode-html-tooltip {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.chat-mode-toggle-btn[data-mode-option="memory"]:hover .chat-mode-html-tooltip {
    display: inline-flex;
    animation: tooltipBodyFadeInTop 0.15s ease-out;
}

.chat-mode-toggle-btn[data-mode-option="memory"]:hover .chat-mode-html-tooltip::before {
    animation: tooltipArrowFadeInTop 0.15s ease-out;
}

@media (hover: none), (pointer: coarse) {
    .chat-mode-toggle-btn[data-mode-option="memory"]:hover .chat-mode-html-tooltip {
        display: none !important;
    }
}

/* Image modal animation */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.animate-fade-in {
    animation: fadeIn 0.2s ease-in-out;
}

/* Smooth scroll behavior */
html {
    scroll-behavior: smooth;
}

#chat-area {
    scroll-behavior: smooth;
    scrollbar-gutter: stable;
    scrollbar-width: thin;
    scrollbar-color: transparent transparent;
}

/* Hide chat area scrollbar by default, show on hover/scroll */
#chat-area::-webkit-scrollbar {
    width: 8px;
}

#chat-area::-webkit-scrollbar-track {
    background: transparent;
}

#chat-area::-webkit-scrollbar-thumb {
    background-color: transparent;
    border-radius: 4px;
    transition: background-color 0.18s ease;
}

#chat-area.scrolling {
    scrollbar-color: var(--slate-6) transparent;
}

#chat-area.scrolling::-webkit-scrollbar-thumb {
    background-color: var(--slate-6);
}


/* Streaming token count animation */
.streaming-token-count {
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* Message action buttons */
.message-action-btn {
    opacity: 0.6; /* Default visible for assistant */
    -webkit-tap-highlight-color: transparent;
    transition: opacity 0.2s ease, background-color 0.15s ease, color 0.15s ease;
}

/* User Message Actions Container - Handle visibility as a group */
.message-user-actions {
    opacity: 0;
    transition: opacity 0.2s ease;
}

/* Show container on group hover, self hover, or forced visible */
.group:hover .message-user-actions,
.message-user-actions:hover,
.message-user-actions.force-visible {
    opacity: 1;
}

/* Elevate message actions above input area when visible for tooltip visibility */
.message-user-actions:hover {
    z-index: 50;
}

/* Inside the user container, buttons are always fully opaque (container handles fade) */
.message-user-actions .message-action-btn {
    opacity: 1;
}

/* Only the specific button being hovered should be fully opaque */
.message-action-btn:hover {
    opacity: 1;
}

.message-action-btn:focus {
    opacity: 1;
}

.message-action-btn:active,
.message-action-btn.is-processing {
    opacity: 1;
    background-color: hsl(var(--color-muted) / 0.55);
    color: hsl(var(--color-foreground));
    transition-duration: 0s;
}

.dark .message-action-btn:active,
.dark .message-action-btn.is-processing {
    background-color: hsl(var(--color-muted) / 0.35);
}

.assistant-actions-placeholder {
    min-height: 1.75rem;
    pointer-events: none;
}

/* Extra bottom margin for the last user message (when no response follows)
   to make room for action buttons that won't overlap with the input area */
#messages-container > .self-end:last-child {
    margin-bottom: 2.5rem;
}

/* Custom Tooltip Styles — speech-bubble shape with outlined arrow
   Arrow is a rotated square with selective borders, positioned above the body
   so its background covers the body's border at the junction. */
[data-tooltip] {
    position: relative;
}

[data-tooltip].tooltip-disabled:hover::after,
[data-tooltip].tooltip-disabled:hover::before {
    display: none !important;
}

@media (hover: none), (pointer: coarse) {
    [data-tooltip]:hover::after,
    [data-tooltip]:hover::before {
        display: none !important;
    }
}

[data-tooltip]:hover {
    z-index: 50;
}

/* --- Tooltip body (default: below element) --- */
[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background-color: hsl(var(--color-popover));
    color: hsl(var(--color-popover-foreground));
    border: 1px solid hsl(var(--color-border));
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    white-space: nowrap;
    z-index: 9999;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    pointer-events: none;
    animation: tooltipBodyFadeIn 0.15s ease-out;
}

/* --- Tooltip arrow (default: points up toward element) --- */
[data-tooltip]:hover::before {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    width: 8px;
    height: 8px;
    background-color: hsl(var(--color-popover));
    border-top: 1px solid hsl(var(--color-border));
    border-left: 1px solid hsl(var(--color-border));
    transform: translateX(-50%) translateY(4px) rotate(45deg);
    z-index: 10000;
    pointer-events: none;
    animation: tooltipArrowFadeIn 0.15s ease-out;
}

@keyframes tooltipBodyFadeIn {
    from { opacity: 0; transform: translateX(-50%) translateY(4px); }
    to   { opacity: 1; transform: translateX(-50%) translateY(8px); }
}

@keyframes tooltipArrowFadeIn {
    from { opacity: 0; transform: translateX(-50%) translateY(0px) rotate(45deg); }
    to   { opacity: 1; transform: translateX(-50%) translateY(4px) rotate(45deg); }
}

/* --- Position: top (elements at bottom of screen) --- */
[data-tooltip-position="top"]:hover::after {
    top: auto;
    bottom: 100%;
    transform: translateX(-50%) translateY(-8px);
    animation: tooltipBodyFadeInTop 0.15s ease-out;
}

[data-tooltip-position="top"]:hover::before {
    top: auto;
    bottom: 100%;
    border: none;
    border-bottom: 1px solid hsl(var(--color-border));
    border-right: 1px solid hsl(var(--color-border));
    transform: translateX(-50%) translateY(-4px) rotate(45deg);
    animation: tooltipArrowFadeInTop 0.15s ease-out;
}

@keyframes tooltipBodyFadeInTop {
    from { opacity: 0; transform: translateX(-50%) translateY(-4px); }
    to   { opacity: 1; transform: translateX(-50%) translateY(-8px); }
}

@keyframes tooltipArrowFadeInTop {
    from { opacity: 0; transform: translateX(-50%) translateY(0px) rotate(45deg); }
    to   { opacity: 1; transform: translateX(-50%) translateY(-4px) rotate(45deg); }
}

/* Multiline tooltip support for ephemeral key details */
[data-tooltip-multiline="true"]:hover::after {
    white-space: pre-line;
    min-width: 280px;
    max-width: 420px;
    text-align: left;
    line-height: 1.5;
    font-family: var(--font-sans), system-ui, -apple-system, sans-serif;
}

/* --- Position: right-aligned (right panel elements) --- */
[data-tooltip-position="right"]:hover::after {
    left: auto;
    right: 0;
    transform: translateY(8px);
    animation: tooltipBodyFadeInRight 0.15s ease-out;
}

[data-tooltip-position="right"]:hover::before {
    left: auto;
    right: 12px;
    transform: translateY(4px) rotate(45deg);
    animation: tooltipArrowFadeInRight 0.15s ease-out;
}

@keyframes tooltipBodyFadeInRight {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(8px); }
}

@keyframes tooltipArrowFadeInRight {
    from { opacity: 0; transform: translateY(0px) rotate(45deg); }
    to   { opacity: 1; transform: translateY(4px) rotate(45deg); }
}

/* Dark mode tooltip adjustment */
.dark [data-tooltip]:hover::after {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    background-color: hsl(var(--color-popover));
}

.dark [data-tooltip]:hover::before {
    background-color: hsl(var(--color-popover));
}

/* Dark mode: reduce hover brightness for better contrast */
.dark .message-action-btn:hover {
    background-color: hsl(var(--color-muted) / 0.4) !important;
}

/* Specific fix for delete history button tooltip alignment */
/* #delete-history-btn[data-tooltip]:hover::after {
    left: auto;
    right: 0;
    transform: translateY(8px);
} */

/* Edit prompt form */
.edit-prompt-form {
    animation: none;
}

.edit-prompt-input-card {
    transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.edit-prompt-input-card.edit-prompt-drag-active {
    border-color: hsl(var(--color-primary) / 0.45);
    background-color: hsl(var(--color-primary) / 0.04);
    box-shadow: 0 0 0 2px hsl(var(--color-primary) / 0.14);
}

.edit-prompt-textarea {
    appearance: none;
    border: 0;
    font-size: 0.875rem;
    line-height: 1.5;
    min-height: 80px;
    max-height: 40vh;
    outline: none;
    box-shadow: none;
}

.edit-prompt-textarea:focus {
    border-color: transparent;
    box-shadow: none;
    outline: none;
}

/* Subtle theme-aware resize handle - sized to be visible with or without scrollbar */
.edit-prompt-textarea::-webkit-resizer {
    width: 16px;
    height: 16px;
    background: linear-gradient(
        135deg,
        transparent 35%,
        hsl(var(--color-muted-foreground) / 0.3) 35%,
        hsl(var(--color-muted-foreground) / 0.3) 45%,
        transparent 45%,
        transparent 55%,
        hsl(var(--color-muted-foreground) / 0.3) 55%,
        hsl(var(--color-muted-foreground) / 0.3) 65%,
        transparent 65%
    );
    background-size: 100% 100%;
    border-radius: 0 0 6px 0;
}

/* Hide the scrollbar corner to prevent conflict with resize handle */
.edit-prompt-textarea::-webkit-scrollbar-corner {
    background: hsl(var(--color-background));
}

/* Style the scrollbar to be subtle and match the theme */
.edit-prompt-textarea::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.edit-prompt-textarea::-webkit-scrollbar-track {
    background: transparent;
}

.edit-prompt-textarea::-webkit-scrollbar-thumb {
    background: hsl(var(--color-muted-foreground) / 0.3);
    border-radius: 4px;
}

.edit-prompt-textarea::-webkit-scrollbar-thumb:hover {
    background: hsl(var(--color-muted-foreground) / 0.5);
}

/* Shared focus style for textareas and inputs - clean, subtle, no heavy ring */
.input-focus-clean:focus {
    border-color: hsl(var(--color-ring) / 0.6);
    box-shadow: 0 0 0 1px hsl(var(--color-ring) / 0.4);
    outline: none;
}

/* Confirm Edit Button */
.confirm-edit-btn {
    background-color: hsl(var(--color-background));
}

.confirm-edit-btn:hover {
    background-color: hsl(var(--color-accent) / 0.5) !important;
    border-color: hsl(var(--color-foreground) / 0.3) !important;
}

/* Right panel invitation code: highlight the full input+button shell */
.invitation-code-input-shell:focus-within {
    border-color: hsl(var(--color-ring) / 0.6);
    box-shadow: 0 0 0 1px hsl(var(--color-ring) / 0.4);
}

/* Shared subtle hover effect for secondary buttons */
.btn-ghost-hover:hover {
    background-color: hsl(var(--color-hover)) !important;
    border-color: hsl(var(--color-foreground) / 0.3) !important;
}

/* Sidebar account tab */
.account-tab-btn {
    position: absolute;
    left: 0.75rem;
    bottom: 0.75rem;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.35rem 0.6rem;
    border-radius: 9999px;
    border: 1px solid hsl(var(--color-border));
    background-color: hsl(var(--color-background));
    color: hsl(var(--color-foreground));
    font-size: 0.7rem;
    font-weight: 600;
    box-shadow: 0 6px 16px hsl(var(--color-foreground) / 0.08);
    transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
    z-index: 5;
}

.account-tab-btn:hover {
    background-color: hsl(var(--color-hover));
    border-color: hsl(var(--color-foreground) / 0.3);
    transform: translateY(-1px);
}

.account-tab-dot {
    width: 6px;
    height: 6px;
    border-radius: 9999px;
    background-color: hsl(var(--color-muted-foreground));
}

.account-tab-btn[data-status="logged-in"] .account-tab-dot {
    background-color: var(--color-status-success);
}

/* Logged-in glow effect for account button */
.account-tab-btn[data-status="logged-in"] {
    border-color: rgba(73, 137, 102, 0.5);
    border-width: 1.5px;
}

@keyframes accountGlowPulse {
    0% {
        box-shadow: 0 6px 16px hsl(var(--color-foreground) / 0.08),
            0 0 0 2px hsl(var(--color-primary) / 0.25),
            0 0 12px 2px hsl(var(--color-primary) / 0.2);
    }
    50% {
        box-shadow: 0 6px 16px hsl(var(--color-foreground) / 0.08),
            0 0 0 2px hsl(var(--color-primary) / 0.45),
            0 0 24px 8px hsl(var(--color-primary) / 0.4);
    }
    100% {
        box-shadow: 0 6px 16px hsl(var(--color-foreground) / 0.08),
            0 0 0 2px hsl(var(--color-primary) / 0.25),
            0 0 12px 2px hsl(var(--color-primary) / 0.2);
    }
}

/* Light mode glory animation - uses explicit blue colors for proper visibility on white */
@keyframes accountGlowPulseLight {
    0% {
        box-shadow:
            0 4px 14px rgba(30, 64, 175, 0.12),
            0 0 0 2px rgba(37, 99, 235, 0.4),
            0 0 16px 4px rgba(37, 99, 235, 0.28),
            0 0 32px 8px rgba(59, 130, 246, 0.15);
    }
    50% {
        box-shadow:
            0 6px 20px rgba(30, 64, 175, 0.15),
            0 0 0 3px rgba(37, 99, 235, 0.55),
            0 0 24px 8px rgba(37, 99, 235, 0.38),
            0 0 44px 14px rgba(59, 130, 246, 0.22);
    }
    100% {
        box-shadow:
            0 4px 14px rgba(30, 64, 175, 0.12),
            0 0 0 2px rgba(37, 99, 235, 0.4),
            0 0 16px 4px rgba(37, 99, 235, 0.28),
            0 0 32px 8px rgba(59, 130, 246, 0.15);
    }
}

.account-tab-btn.account-glow {
    border-color: hsl(var(--color-primary) / 0.65);
    box-shadow: 0 6px 16px hsl(var(--color-foreground) / 0.08),
        0 0 0 2px hsl(var(--color-primary) / 0.25),
        0 0 12px 2px hsl(var(--color-primary) / 0.2);
    animation: accountGlowPulse 1.4s ease-in-out infinite;
}

#show-sidebar-btn.account-glow {
    border-color: hsl(var(--color-primary) / 0.65);
    box-shadow: 0 0 0 2px hsl(var(--color-primary) / 0.25),
        0 0 18px 6px hsl(var(--color-primary) / 0.35);
    animation: accountGlowPulse 1.4s ease-in-out infinite;
}

/* Enhanced light mode glory - multi-layered blue glow with dedicated animation */
.theme-light .account-tab-btn.account-glow,
:root:not(.dark) .account-tab-btn.account-glow {
    border-color: rgba(37, 99, 235, 0.6);
    box-shadow:
        0 4px 14px rgba(30, 64, 175, 0.12),
        0 0 0 2px rgba(37, 99, 235, 0.4),
        0 0 16px 4px rgba(37, 99, 235, 0.28),
        0 0 32px 8px rgba(59, 130, 246, 0.15);
    animation: accountGlowPulseLight 1.4s ease-in-out infinite;
}

.theme-light #show-sidebar-btn.account-glow,
:root:not(.dark) #show-sidebar-btn.account-glow {
    border-color: rgba(37, 99, 235, 0.6);
    box-shadow:
        0 0 0 2px rgba(37, 99, 235, 0.4),
        0 0 20px 6px rgba(37, 99, 235, 0.35),
        0 0 40px 12px rgba(59, 130, 246, 0.2);
    animation: accountGlowPulseLight 1.4s ease-in-out infinite;
}

/* ============================================
   ACCOUNT CREATION ANIMATIONS
   ============================================ */

/* Success checkmark animation */
@keyframes checkmarkDraw {
    0% { stroke-dashoffset: 24; }
    100% { stroke-dashoffset: 0; }
}

.success-checkmark {
    stroke-dasharray: 24;
    stroke-dashoffset: 24;
    animation: checkmarkDraw 0.4s ease-out 0.2s forwards;
}

@media (prefers-reduced-motion: reduce) {
    .success-checkmark {
        animation: none;
        stroke-dashoffset: 0;
    }

    .account-tab-btn.account-glow {
        animation: none;
        box-shadow: 0 6px 16px hsl(var(--color-foreground) / 0.08),
            0 0 0 2px hsl(var(--color-primary) / 0.35),
            0 0 18px 6px hsl(var(--color-primary) / 0.35);
    }

    #show-sidebar-btn.account-glow {
        animation: none;
        box-shadow: 0 0 0 2px hsl(var(--color-primary) / 0.35),
            0 0 18px 6px hsl(var(--color-primary) / 0.35);
    }
}

/* ============================================
   ACCOUNT MODAL
   ============================================ */

/* Account Number Display - tabular nums for consistent digit width */
.account-number-text {
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.15em;
}

/* Destructive ghost hover */
.btn-destructive-hover:hover {
    background-color: hsl(var(--color-destructive) / 0.2) !important;
    border-color: hsl(var(--color-destructive) / 0.4) !important;
}

/* Destructive button with brighter hover */
.btn-destructive-bright:hover {
    background-color: hsl(0 62.8% 38%) !important;
    box-shadow: 0 2px 8px hsl(var(--color-destructive) / 0.3);
}

/* Primary (blue) button with brighter hover */
.btn-primary-bright:hover {
    background-color: hsl(217 91% 50%) !important;
    box-shadow: 0 2px 8px hsl(217 91% 60% / 0.4);
}

/* Welcome landing (kept in static CSS to avoid runtime <style> injection jank) */
.welcome-modal-scaled {
    --welcome-modal-scale: 1;
    width: 29rem !important;
    max-width: 29rem !important;
    flex-shrink: 0;
    transform: scale(var(--welcome-modal-scale));
    transform-origin: top center;
    will-change: transform;
}

.welcome-landing {
    margin-top: 12vh;
    opacity: 0;
    transform: translateY(10px);
    animation: welcomeRiseFadeIn 0.24s ease-out 0.03s forwards;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

@keyframes welcomeRiseFadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.welcome-title {
    font-size: 1.25rem;
    font-weight: 500;
    color: hsl(var(--color-foreground));
    margin-bottom: 0.375rem;
}

.welcome-subtitle {
    font-size: 0.875rem;
    color: hsl(var(--color-muted-foreground));
}

.welcome-subtitle a {
    color: hsl(var(--color-muted-foreground));
    text-decoration: none;
    border-bottom: 1px solid hsl(var(--color-border));
    transition: color 0.15s ease, border-bottom-color 0.15s ease;
}

.welcome-subtitle a:hover {
    color: hsl(var(--color-foreground));
    border-bottom-color: hsl(var(--color-foreground) / 0.5);
}

.welcome-content {
    font-size: 0.75rem !important;
}

.welcome-content p,
.welcome-content li,
.welcome-content a {
    font-size: 0.75rem !important;
}

.welcome-content a {
    text-decoration: underline;
}

/* System panel content entrance: explicit start/end states for reliable startup animation */
.system-panel-fade-prepare {
    opacity: 0;
    transform: translateY(8px);
    filter: blur(2px);
}

.system-panel-fade-in {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
    transition: opacity 0.28s ease-out, transform 0.28s ease-out, filter 0.28s ease-out;
    will-change: opacity, transform, filter;
}

/* Update toast */
.update-toast {
    position: fixed;
    left: 50%;
    bottom: 7.25rem;
    transform: translateX(-50%);
    z-index: 55;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.4rem 0.35rem 0.7rem;
    border-radius: 9999px;
    background: hsl(var(--color-card) / 0.92);
    border: 1px solid hsl(var(--color-border) / 0.7);
    color: hsl(var(--color-foreground));
    box-shadow: 0 12px 30px -18px rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(10px);
    animation: updateToastIn 0.2s ease-out;
}

.update-toast__label {
    font-size: 0.8125rem;
    letter-spacing: 0.01em;
}

.update-toast__action {
    border-radius: 9999px;
    padding: 0.22rem 0.6rem;
    font-size: 0.7rem;
    font-weight: 600;
    background-color: #2563eb;
    border: 1px solid transparent;
    color: #ffffff;
    transition: background-color 0.15s ease, box-shadow 0.15s ease;
}

.update-toast__action:hover {
    background-color: #1d4ed8;
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
}

.update-toast__dismiss {
    border-radius: 9999px;
    padding: 0.2rem;
    margin-left: -0.15rem;
    line-height: 0;
    border: 1px solid transparent;
    background: transparent;
    color: hsl(var(--color-muted-foreground));
    transition: color 0.15s ease, background-color 0.15s ease;
}

.update-toast__dismiss svg {
    width: 14px;
    height: 14px;
}

.update-toast__dismiss:hover {
    color: hsl(var(--color-foreground));
    background-color: hsl(var(--color-hover));
}

.update-toast button:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px hsl(var(--color-ring) / 0.5);
}

.update-toast--stacked {
    flex-wrap: wrap;
    max-width: min(92vw, 520px);
    padding: 0.5rem 0.6rem 0.5rem 0.8rem;
    row-gap: 0.35rem;
}

.update-toast__label--stacked {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    min-width: 0;
}

.update-toast__code {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.01em;
    word-break: break-all;
}

@keyframes updateToastIn {
    from {
        opacity: 0;
        transform: translate(-50%, 8px);
    }
    to {
        opacity: 1;
        transform: translate(-50%, 0);
    }
}

@media (prefers-reduced-motion: reduce) {
    .system-panel-fade-prepare,
    .system-panel-fade-in {
        transition: none !important;
        transform: none !important;
        filter: none !important;
    }

    .update-toast {
        animation: none;
    }
}

.split-result-card {
    margin-top: 0.55rem;
    padding: 0.58rem;
    border-radius: 0.7rem;
    border: 1px solid hsl(var(--color-border) / 0.82);
    background: hsl(var(--color-background));
}

.split-result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.45rem;
}

.split-result-title {
    flex: 1;
    min-width: 0;
    font-size: 0.66rem;
    line-height: 1rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    color: hsl(var(--color-foreground));
}

.split-result-dismiss-btn {
    width: 1.35rem;
    height: 1.35rem;
    border-radius: 0.4rem;
}

.split-result-field-row {
    display: flex;
    align-items: stretch;
    gap: 0.35rem;
}

.split-result-field-value {
    display: flex;
    align-items: center;
    flex: 1;
    min-width: 0;
    height: 1.55rem;
    padding: 0 0.45rem;
    border: 1px solid hsl(var(--color-border) / 0.9);
    border-radius: 0.5rem;
    background: hsl(var(--color-background));
    color: hsl(var(--color-primary));
    font-family: var(--font-mono);
    font-size: 0.66rem;
    line-height: 1rem;
    white-space: nowrap;
    overflow-x: auto;
    scrollbar-width: thin;
    text-decoration: none;
}

.split-result-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.55rem;
    height: 1.55rem;
    border-radius: 0.45rem;
    border: 1px solid hsl(var(--color-border));
    background: hsl(var(--color-background));
    color: hsl(var(--color-muted-foreground));
    transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.split-result-icon-btn:hover {
    color: hsl(var(--color-foreground));
    border-color: hsl(var(--color-foreground) / 0.25);
    background: hsl(var(--color-hover));
}

.split-result-icon-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px hsl(var(--color-ring) / 0.45);
}

.split-result-share {
    margin-top: 0.55rem;
    padding-top: 0.5rem;
    border-top: 1px dashed hsl(var(--color-border) / 0.95);
}

.split-result-share-label {
    font-size: 0.64rem;
    line-height: 0.95rem;
    color: hsl(var(--color-muted-foreground));
}

.split-result-share .split-result-field-row {
    margin-top: 0.35rem;
}

.split-result-share-link {
    color: hsl(var(--color-primary));
}

.split-result-share-link:hover {
    border-color: hsl(var(--color-primary) / 0.45);
    background: hsl(var(--color-accent) / 0.7);
}

.split-result-share-link:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px hsl(var(--color-ring) / 0.45);
}

.split-result-share-copy-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    min-width: 2.65rem;
    border-radius: 0.5rem;
    border: 1px solid hsl(var(--color-border));
    background: hsl(var(--color-background));
    color: hsl(var(--color-foreground));
    font-size: 0.65rem;
    font-weight: 600;
    line-height: 1rem;
    padding: 0.34rem 0.5rem;
    transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.split-result-share-copy-btn:hover {
    border-color: hsl(var(--color-primary) / 0.45);
    background: hsl(var(--color-primary) / 0.12);
}

.split-result-share-copy-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px hsl(var(--color-ring) / 0.45);
}

@media (max-width: 400px) {
    .split-result-share-copy-btn {
        min-width: 2.4rem;
    }
}



/* Input Area Wrapper - ensure it's above message content */
.absolute.bottom-0.left-0.right-0 {
    z-index: 20; /* Above message elements like .user-message-show-more (z-1) and .message-user-actions (z-10) */
}

/* Input Card - Frosted Glass Effect */
#input-card {
    --chatbar-surface: hsl(var(--color-card) / var(--glass-opacity));
    background: var(--chatbar-surface);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-color: hsl(var(--color-border) / 0.6);
    min-height: 5.5rem; /* Prevents layout shift while inner content loads */
}

/* Scrubber preview diff (hold Control) */
.scrubber-preview-diff {
    position: absolute;
    /* Account for parent .scrubber-input-row padding: py-1.5 (6px), pl-2 (8px), pr-px (1px) */
    top: 0.375rem;
    left: 0.5rem;
    right: 1px;
    bottom: 0.375rem;
    opacity: 0;
    pointer-events: none;
    transition: none;
    /* Match textarea padding (textarea has padding-right: 64px for hints) */
    padding: 0;
    padding-right: 64px;
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    white-space: pre-wrap;
    word-break: break-word;
    color: hsl(var(--color-foreground));
    /* Match textarea default max-height constraint (300px) */
    max-height: 300px;
    overflow-y: auto;
    overflow-x: hidden;
    overscroll-behavior: contain;
}

.scrubber-preview-diff[contenteditable="true"] {
    cursor: text;
    outline: none;
}

.scrubber-deleted {
    text-decoration: line-through;
    opacity: 0.85;
    background: rgb(254 226 226); /* bg-red-100 */
    color: rgb(185 28 28); /* text-red-700 */
    text-decoration-color: rgb(185 28 28);
    border-radius: 2px;
    padding: 0 2px;
    user-select: none;
    pointer-events: none;
}

:root.dark .scrubber-deleted {
    background: rgb(127 29 29 / 0.3); /* dark:bg-red-900/30 */
    color: rgb(248 113 113); /* dark:text-red-400 */
    text-decoration-color: rgb(248 113 113);
}

.scrubber-added {
    background: rgb(220 252 231); /* bg-green-100 */
    border-radius: 2px;
    padding: 0 2px;
    color: rgb(21 128 61); /* text-green-700 */
}

:root.dark .scrubber-added {
    background: rgb(20 83 45 / 0.3); /* dark:bg-green-900/30 */
    color: rgb(74 222 128); /* dark:text-green-400 */
}

#input-card.scrubber-preview-active .scrubber-preview-diff {
    opacity: 1;
    pointer-events: auto;
}

#input-card.scrubber-preview-active #message-input {
    opacity: 0;
    overflow: hidden;
}

#input-card.scrubber-preview-active #scrubber-shortcut-hint {
    opacity: 0;
}

#input-card.scrubber-preview-active .scrubber-input-row {
    overflow: hidden;
}

#input-card.scrubber-preview-expanded .scrubber-input-row {
    max-height: 55vh;
    overflow: visible;
}

#input-card.scrubber-preview-expanded #message-input {
    max-height: 55vh !important;
    overflow-y: auto;
}

#input-card.scrubber-preview-expanded .scrubber-preview-diff {
    max-height: 55vh;
    overflow-y: auto;
}

/* Ensure expanded preview is above other elements like message navigation */
/* The parent needs z-index because input-card has isolation:isolate which creates a stacking context */
div:has(> #input-card.scrubber-preview-expanded) {
    z-index: 50;
}

#input-card.scrubber-preview-expanded {
    z-index: 50;
}

/* Preview hint - positioning via Tailwind, CSS handles opacity states */
#scrubber-preview-hint {
    z-index: 20;
    background: transparent;
}

#input-card.scrubber-preview-editing #scrubber-preview-hint {
    pointer-events: auto;
}

.scrubber-preview-expand {
    display: none;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: 6px;
    color: hsl(var(--color-muted-foreground) / 0.7);
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
    pointer-events: auto;
}

#input-card.scrubber-preview-editing .scrubber-preview-expand {
    display: inline-flex;
}

.scrubber-preview-expand:hover {
    color: hsl(var(--color-foreground));
    background: hsl(var(--color-muted) / 0.6);
}

.scrubber-preview-expand.is-active {
    color: hsl(var(--color-foreground));
    background: hsl(var(--color-muted) / 0.85);
}

#input-card.has-scrubber-pending #scrubber-preview-hint {
    opacity: 1;
}

.scrubber-original-tooltip {
    position: fixed;
    z-index: 99999;
    min-width: 200px;
    max-height: 50vh;
    overflow-y: auto;
    padding: 12px 14px;
    border-radius: 14px;
    background: hsl(var(--color-card) / 0.85);
    backdrop-filter: blur(20px) saturate(150%);
    -webkit-backdrop-filter: blur(20px) saturate(150%);
    color: hsl(var(--color-foreground));
    border: 1px solid hsl(var(--color-border) / 0.5);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
    font-size: 12px;
    line-height: 1.5;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 180ms ease-out, transform 180ms ease-out;
    pointer-events: none;
}

.scrubber-original-tooltip.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    user-select: text;
}

/* Scrubber shortcut hint - state classes for opacity */
#scrubber-shortcut-hint.faded {
    opacity: 0.35;
}

#scrubber-shortcut-hint.hint-hidden {
    opacity: 0;
}

/* Scrubber shortcut key badge styling */
.scrubber-shortcut-key {
    font-family: inherit;
    font-size: 10px;
    font-weight: 500;
    padding: 1px 4px;
    border-radius: 4px;
    background: transparent;
    border: 1px solid hsl(var(--color-border) / 0.55);
    color: hsl(var(--color-muted-foreground));
}

/* Ensure caret is visible on initial focus */
#message-input {
    /* Fallback to currentColor (inherits from text color), then use CSS variable */
    caret-color: currentColor;
    caret-color: hsl(var(--color-foreground));
}

/* Input padding adjustment for hint visibility */
#message-input.hint-visible {
    padding-right: 150px !important;
}

#message-input:not(.hint-visible) {
    padding-right: 64px !important;
}

/* Anchor scrubber hints to initial input center */
#scrubber-shortcut-hint,
#scrubber-preview-hint {
    top: var(--scrubber-hint-center, 50%);
    transform: translateY(-50%);
}

/* Message input & diff preview scrollbar - ultra thin and flush to right edge */
#message-input,
.scrubber-preview-diff {
    scrollbar-width: thin;
    scrollbar-color: hsl(var(--color-muted-foreground) / 0.2) transparent;
}

#message-input::-webkit-scrollbar,
.scrubber-preview-diff::-webkit-scrollbar {
    width: 2px;
}

#message-input::-webkit-scrollbar-track,
.scrubber-preview-diff::-webkit-scrollbar-track {
    background: transparent;
}

#message-input::-webkit-scrollbar-thumb,
.scrubber-preview-diff::-webkit-scrollbar-thumb {
    background: hsl(var(--color-muted-foreground) / 0.2);
    border-radius: 1px;
}

#message-input::-webkit-scrollbar-thumb:hover,
.scrubber-preview-diff::-webkit-scrollbar-thumb:hover {
    background: hsl(var(--color-muted-foreground) / 0.35);
}

/* Scrubbing animation - breathing blue border glow
   Works in all browsers using standard CSS animations.
   
   Border radius calculation:
   - input-card uses rounded-lg = 0.5rem = 8px
   - With inset: -2px, extends outside the box
   - border-radius = 8px + 2px = 10px
*/

/* Breathing blue border glow */
#input-card.scrubbing::before {
    content: '';
    position: absolute;
    inset: -2px; /* extend outside the box */
    border-radius: 10px; /* 8px + 2px offset */
    padding: 2.5px;
    background: linear-gradient(
        135deg,
        rgba(59, 130, 246, 0.8) 0%,
        rgba(96, 165, 250, 0.9) 25%,
        rgba(59, 130, 246, 0.8) 50%,
        rgba(96, 165, 250, 0.9) 75%,
        rgba(59, 130, 246, 0.8) 100%
    );
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    z-index: -1; /* behind the card so it doesn't cover content */
    animation: scrubber-breathing 1.8s ease-in-out infinite;
}

@keyframes scrubber-breathing {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
    #input-card.scrubbing::before {
        animation: none;
        opacity: 0.8;
    }
}

/* Scroll to Bottom Button - frost glass effect */
.scroll-to-bottom-btn {
    /* On desktop: position absolute relative to input container */
    position: absolute;
    bottom: calc(100% + 0.5rem); /* Just above the input card */
    /* Align with right edge of centered 42rem card, with minimum 1rem from edge */
    right: max(1rem, calc(50% - 21rem));
    z-index: 55;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.35rem 0.75rem;
    min-height: 1.75rem;
    border-radius: 9999px;
    /* Frost glass effect */
    background: hsl(var(--color-card) / 0.7);
    backdrop-filter: saturate(120%) blur(var(--glass-blur));
    -webkit-backdrop-filter: saturate(120%) blur(var(--glass-blur));
    border: 1px solid hsl(var(--color-border) / 0.5);
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    color: hsl(var(--color-foreground));
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: opacity 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
    opacity: 0;
    pointer-events: none;
}

.scroll-to-bottom-btn.visible {
    opacity: 1;
    pointer-events: auto;
}

.scroll-to-bottom-btn:hover {
    background: hsl(var(--color-card) / 0.85);
    box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

.scroll-to-bottom-btn:active {
    transform: translateY(0);
}

.scroll-to-bottom-btn svg {
    width: 0.95rem;
    height: 0.95rem;
}

.scroll-btn-label {
    line-height: 1;
}

/* Dark mode - more translucent to show frost effect */
.dark .scroll-to-bottom-btn {
    background: hsl(var(--color-card) / 0.6);
    border-color: hsl(var(--color-border) / 0.4);
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
}

.dark .scroll-to-bottom-btn:hover {
    background: hsl(var(--color-card) / 0.75);
    box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.45), 0 8px 10px -6px rgb(0 0 0 / 0.35);
}

/* Tablet: input card becomes fixed, so button needs fixed positioning too */
@media (max-width: 767px) {
    .scroll-to-bottom-btn {
        position: fixed;
        bottom: 6.5rem;
        right: 1rem;
    }
}

/* Mobile: compact style with fixed positioning */
@media (max-width: 639px) {
    .scroll-to-bottom-btn {
        position: fixed;
        padding: 0.3rem 0.6rem;
        gap: 0.35rem;
        font-size: 0.7rem;
        bottom: 6.5rem;
        right: 1rem;
    }

    .scroll-to-bottom-btn svg {
        width: 0.85rem;
        height: 0.85rem;
    }
}

/* ===== Print Styles for PDF Export ===== */
@media print {
    /* Hide all non-message UI elements */
    #sidebar,
    #right-panel,
    #input-card,
    #chat-toolbar,
    #show-sidebar-btn,
    #show-right-panel-btn,
    #wide-mode-btn,
    .mobile-sidebar-backdrop,
    .message-navigation,
    .scroll-to-bottom-btn,
    #model-picker-modal,
    #delete-history-modal,
    #verify-key-modal,
    #account-modal,
    #link-preview-card,
    .message-user-actions,
    .copy-message-btn,
    .regenerate-message-btn,
    .edit-prompt-btn,
    .fork-conversation-btn {
        display: none !important;
    }

    /* Reset layout for print */
    html, body {
        height: auto !important;
        overflow: visible !important;
        background: white !important;
    }

    #app {
        display: block !important;
        height: auto !important;
    }

    main {
        padding: 0 !important;
    }

    /* Chat area - remove scroll constraints */
    #chat-area {
        overflow: visible !important;
        height: auto !important;
        min-height: 0 !important;
    }

    #messages-container {
        padding: 0 !important;
        max-width: 100% !important;
        gap: 1rem !important;
    }

    /* Message styling for print */
    .message-user,
    .message-assistant {
        box-shadow: none !important;
        border: 1px solid #e5e7eb !important;
        background: white !important;
        color: black !important;
    }

    .message-user {
        background: #f9fafb !important;
    }

    /* Allow long messages to break across pages */
    .message-content {
        page-break-inside: auto;
        break-inside: auto;
    }

    /* Try to avoid breaking inside code blocks */
    .message-content pre {
        page-break-inside: avoid;
        break-inside: avoid;
    }

    /* Keep message headers with their content */
    .group.flex.w-full.flex-col {
        page-break-inside: avoid;
        break-inside: avoid;
    }

    /* Ensure text is readable */
    .prose {
        max-width: 100% !important;
        color: black !important;
    }

    .prose code {
        background: #f3f4f6 !important;
        color: black !important;
    }

    .prose pre {
        background: #f3f4f6 !important;
        border: 1px solid #e5e7eb !important;
    }

    /* Hide action buttons in assistant messages */
    .flex.items-center.justify-between.mt-2 {
        display: none !important;
    }
}

/* ============================================
   SHARE MODAL - PIN INPUT & EXPIRY TOGGLE
   ============================================ */

/* PIN Input Container - OTP-style visual boxes */
.pin-input-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pin-hidden-input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    pointer-events: none;
}

.pin-boxes {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.pin-boxes.shake {
    animation: shake 0.4s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-8px); }
    40% { transform: translateX(8px); }
    60% { transform: translateX(-6px); }
    80% { transform: translateX(6px); }
}

.pin-box {
    width: 2.5rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1.5px solid hsl(var(--color-border));
    border-radius: 0.5rem;
    background: hsl(var(--color-background));
    font-size: 1.25rem;
    font-weight: 600;
    font-family: var(--font-mono);
    color: hsl(var(--color-foreground));
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.pin-box.active {
    border-color: hsl(var(--color-primary));
    box-shadow: 0 0 0 2px hsl(var(--color-primary) / 0.2);
}

.pin-box.filled {
    border-color: hsl(var(--color-foreground) / 0.3);
}

.pin-separator {
    font-size: 1.25rem;
    font-weight: 300;
    color: hsl(var(--color-muted-foreground));
    padding: 0 0.125rem;
}

/* Focus state when input is focused */
.pin-input-container:focus-within .pin-box:not(.filled):first-of-type,
.pin-input-container:focus-within .pin-box.active {
    border-color: hsl(var(--color-primary));
    box-shadow: 0 0 0 2px hsl(var(--color-primary) / 0.2);
}

.toggle-pin-visibility {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.toggle-pin-visibility:hover {
    background: hsl(var(--color-muted) / 0.5);
    color: hsl(var(--color-foreground));
}

/* ----------------------------------------
   Expiry Toggle (Segmented Control)
   5-way: 1d, 7d, 30d, ∞, Custom
   ---------------------------------------- */

.expiry-toggle-container {
    display: flex;
    position: relative;
    background: hsl(var(--color-muted) / 0.6);
    border-radius: 0.5rem;
    padding: 3px;
    gap: 2px;
}

/* Sliding indicator for 5-way toggle (1/5 width) */
.expiry-toggle-indicator {
    position: absolute;
    top: 3px;
    left: 3px;
    width: calc(20% - 2.4px);
    height: calc(100% - 6px);
    background: hsl(var(--color-background) / 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 0.375rem;
    box-shadow: 0 1px 3px hsl(0 0% 0% / 0.1), 0 1px 2px hsl(0 0% 0% / 0.06);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.dark .expiry-toggle-indicator {
    background: hsl(var(--color-card) / 0.95);
    box-shadow: 0 1px 3px hsl(0 0% 0% / 0.3), 0 0 0 1px hsl(var(--color-border) / 0.3);
}

/* Toggle buttons */
.expiry-toggle-btn {
    flex: 1;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.4rem 0.5rem;
    border-radius: 0.375rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: hsl(var(--color-muted-foreground));
    transition: color 0.2s ease;
    cursor: pointer;
    background: transparent;
    border: none;
    white-space: nowrap;
}

.expiry-toggle-btn:hover {
    color: hsl(var(--color-foreground));
}

.expiry-toggle-btn[aria-checked="true"] {
    color: hsl(var(--color-foreground));
}

/* Share action button - copy feedback */
.share-action-btn.bg-green-600 {
    background-color: #16a34a !important;
}

.share-action-btn.bg-green-600:hover {
    background-color: #16a34a !important;
}

/* Text masking for password inputs (avoids browser password manager prompts) */
.text-masked {
    -webkit-text-security: disc;
    text-security: disc;
}

/* Encryption Mode Toggle - Mini segmented control for PIN/Password */
.encryption-mode-toggle {
    display: flex;
    position: relative;
    background: hsl(var(--color-muted) / 0.5);
    border-radius: 0.375rem;
    padding: 2px;
    gap: 1px;
}

.dark #welcome-access-mode-toggle {
    background: hsl(0 0% 10% / 0.78);
    box-shadow: none;
}

.encryption-mode-btn {
    position: relative;
    z-index: 1;
    padding: 0.25rem 0.625rem;
    font-size: 0.6875rem;
    font-weight: 500;
    color: hsl(var(--color-muted-foreground));
    background: transparent;
    border: none;
    border-radius: 0.25rem;
    cursor: pointer;
    transition: color 0.15s ease;
    white-space: nowrap;
}

.encryption-mode-btn:hover {
    color: hsl(var(--color-foreground) / 0.8);
}

.encryption-mode-btn.active {
    color: hsl(var(--color-foreground));
}

.encryption-mode-indicator {
    position: absolute;
    top: 2px;
    left: 2px;
    height: calc(100% - 4px);
    background: hsl(var(--color-background));
    border-radius: 0.25rem;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1), width 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.dark #welcome-access-mode-toggle .encryption-mode-indicator {
    background: hsl(0 0% 22% / 0.96);
    box-shadow: 0 1px 2px hsl(0 0% 0% / 0.18);
}

/* Verifier attestation modal */
.verifier-modal-content {
    height: min(90dvh, 52rem);
    max-height: min(90dvh, 52rem);
}

@supports not (height: 1dvh) {
    .verifier-modal-content {
        height: min(90vh, 52rem);
        max-height: min(90vh, 52rem);
    }
}

.verifier-modal-scroll {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
}

.verifier-collapsible-summary::-webkit-details-marker {
    display: none;
}

.verifier-collapsible-summary::marker {
    display: none;
}

@media (max-width: 640px) {
    .verifier-modal-content {
        height: calc(100dvh - 1rem);
        max-height: calc(100dvh - 1rem);
    }
}

@supports not (height: 1dvh) {
    @media (max-width: 640px) {
        .verifier-modal-content {
            height: calc(100vh - 1rem);
            max-height: calc(100vh - 1rem);
        }
    }
}

.verifier-command {
    display: block;
    overflow-x: auto;
    white-space: normal !important;
    word-break: normal !important;
    overflow-wrap: normal !important;
    -webkit-overflow-scrolling: touch;
}

.verifier-command-line {
    display: block;
    white-space: nowrap;
}