frontend/src/App.css

/* ========================================
   App Layout
   ======================================== */

/* ========================================
   Premium Header
   ======================================== */
.premium-header {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    background: rgba(var(--bg-canvas-rgb, 255, 255, 255), 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: transform 0.3s ease, opacity 0.3s ease, box-shadow 0.3s ease;
    /* Exclude color/background from transition to prevent flickering on theme switch */
}

.dark .premium-header {
    background: rgba(9, 9, 11, 0.75);
    /* Zinc 950 */
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand-wrapper {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    border-radius: 0.75rem;
    transition: background 0.2s;
}

.brand-wrapper:hover {
    background: var(--bg-surface-hover);
}

.brand-name {
    font-family: 'Outfit', sans-serif;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.brand-version {
    color: var(--text-tertiary);
    font-weight: 500;
    font-size: 0.95rem;
    margin-left: 2px;
}

.brand-dropdown-icon {
    color: var(--text-tertiary);
}

.header-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.upgrade-pill {
    /* Layout & Spacing */
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 1.125rem;
    border-radius: 9999px;

    /* Typography - Bold for impact */
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.01em;

    /* Aesthetics (Bold & Sharper) */
    background: linear-gradient(135deg,
            rgba(var(--brand-primary-rgb), 0.20) 0%,
            rgba(var(--brand-primary-rgb), 0.10) 100%);
    color: var(--brand-primary);
    border: 1px solid rgba(var(--brand-primary-rgb), 0.45);

    /* Deeper shadow for 3D feel */
    box-shadow: 0 4px 12px rgba(var(--brand-primary-rgb), 0.12);

    /* Rendering & smoothness */
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform: translateZ(0);
    /* Hardware accel only, no movement */
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* Dark mode adjustment (Kept subtle) */
.dark .upgrade-pill {
    background: linear-gradient(135deg,
            rgba(var(--brand-primary-rgb), 0.15) 0%,
            rgba(var(--brand-primary-rgb), 0.05) 100%);
    border-color: rgba(var(--brand-primary-rgb), 0.3);
    color: rgb(165, 180, 252);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* Hover State - Even Bolder */
.upgrade-pill:hover {
    background: linear-gradient(135deg,
            rgba(var(--brand-primary-rgb), 0.30) 0%,
            rgba(var(--brand-primary-rgb), 0.20) 100%);
    border-color: rgba(var(--brand-primary-rgb), 0.7);
    box-shadow:
        0 6px 16px rgba(var(--brand-primary-rgb), 0.25),
        0 0 0 1px rgba(var(--brand-primary-rgb), 0.15);
    /* Pronounced glow */
    transform: translateZ(0);
    /* Still no movement */
    color: var(--brand-hover);
}

.dark .upgrade-pill:hover {
    background: linear-gradient(135deg,
            rgba(var(--brand-primary-rgb), 0.25) 0%,
            rgba(var(--brand-primary-rgb), 0.1) 100%);
    box-shadow:
        0 4px 20px rgba(0, 0, 0, 0.3),
        0 0 15px rgba(var(--brand-primary-rgb), 0.15);
}

.upgrade-pill:active {
    transform: scale(0.97);
}

.sparkle-icon {
    animation: rotateSparkle 2s infinite linear;
}

@keyframes rotateSparkle {
    0% {
        transform: scale(1) rotate(0);
    }

    50% {
        transform: scale(1.2) rotate(180deg);
        opacity: 0.8;
    }

    100% {
        transform: scale(1) rotate(360deg);
    }
}

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

.header-menu-container {
    position: relative;
    display: flex;
    align-items: center;
}

.header-dropdown {
    top: calc(100% + 0.5rem) !important;
    right: 0 !important;
    transform-origin: top right;
}

.header-icon-btn,
.header-action-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 0.5rem;
    transition: transform 0.2s, opacity 0.2s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    outline: none !important;
}

.header-icon-btn {
    width: 2.5rem;
    height: 2.5rem;
}

.header-action-btn {
    padding: 0.5rem 0.75rem;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 500;
}

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

.help-btn {
    font-family: 'Outfit', sans-serif !important;
    font-weight: 600 !important;
    height: 2.5rem !important;
    /* Match 40px height of other header buttons */
    padding: 0 1rem !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 0.5rem !important;
    line-height: 1 !important;
}

.help-btn .btn-label {
    margin: 0 !important;
    display: inline-block !important;
    line-height: normal !important;
}

.user-avatar-container {
    position: relative;
    display: flex;
    align-items: center;
}

.user-avatar-wrapper {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: 50%;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    /* Exclude background/color from transition to prevent flickering on theme switch */
}

.user-avatar-wrapper:hover,
.user-avatar-wrapper.active {
    background: var(--bg-surface-hover);
}

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

.user-avatar {
    width: 2.2rem;
    height: 2.2rem;
    background: var(--bg-surface);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
    transition: transform 0.2s, opacity 0.2s;
    /* Exclude border/background/color from transition to prevent flickering on theme switch */
}

.user-avatar-wrapper:hover .user-avatar {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
}

.user-dropdown {
    top: calc(100% + 0.5rem) !important;
    right: 0 !important;
    min-width: 220px !important;
    transform-origin: top right;
}

.user-dropdown-header {
    padding: 1rem 1.25rem;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.user-email {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    margin-top: 2px;
}

/* Mobile Specific Header Adjustments */
@media (max-width: 768px) {
    .premium-header {
        padding: 0 1rem;
        height: 56px;
    }

    .btn-label {
        display: none;
    }

    .upgrade-pill {
        display: none;
        /* Hide upgrade on mobile center to save space */
    }

    .header-center {
        display: none;
    }

    .brand-name {
        font-size: 1rem;
    }
}

.app-container {
    display: flex;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    background: var(--bg-canvas);
    color: var(--text-primary);
}

/* ========================================
   Sidebar
   ======================================== */
.sidebar {
    width: 280px;
    background: var(--bg-surface);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    flex-shrink: 0;
    overflow: hidden;
}

.sidebar.collapsed {
    width: 70px;
}

.sidebar-header {
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid transparent;
}

.history-label.collapsible {
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem 0.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-tertiary);
    transition: color 0.2s ease;
}

.history-label.collapsible:hover {
    color: var(--text-primary);
}

.history-label.collapsible svg {
    opacity: 0.5;
    transition: transform 0.2s ease;
}

/* Sidebar Chat Item Refinements */
.sidebar-chat-item {
    position: relative;
    padding: 8px 12px 8px 14px;
    /* Tighter padding as requested */
    font-size: 14.2px;
    /* Slightly larger for readability */
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    border-radius: 8px;
    cursor: pointer;
    transition: opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1;
    /* Base priority */
}

.sidebar-chat-item.menu-open {
    z-index: 100;
    /* Priority elevation when menu is open */
}

.active-indicator {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) scaleY(0.7);
    /* Subtle pop entry */
    width: 3px;
    height: 18px;
    background: #3b82f6;
    border-radius: 0 4px 4px 0;
    opacity: 0;
    transition: opacity 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
        transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 5;
}

.sidebar-chat-item.active .active-indicator {
    opacity: 1;
    transform: translateY(-50%) scaleY(1);
}

.sidebar-chat-item.active {
    background: rgba(59, 130, 246, 0.08);
    color: var(--text-primary);
    font-weight: 600;
}

.dark .sidebar-chat-item.active {
    background: rgba(59, 130, 246, 0.15);
}

.sidebar-chat-item:hover:not(.active) {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
}

.chat-item-text {
    flex: 1;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: clip;
    margin-right: 28px;
    /* More space between text and actions */
}

.chat-item-text.editing {
    margin-right: 0;
    padding-right: 0;
    display: flex;
    align-items: center;
    width: 100%;
}

.inline-rename-input {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 1px solid #3b82f6;
    padding: 0;
    margin: 0;
    font-size: 14.2px;
    font-family: inherit;
    font-weight: inherit;
    color: var(--text-primary);
    outline: none;
    line-height: inherit;
}

.dark .inline-rename-input {
    border-bottom-color: #3b82f6;
}

.chat-item-actions {
    position: absolute;
    right: 8px;
    display: flex;
    align-items: center;
    opacity: 0;
    transform: translateX(4px);
    /* Slide effect */
    transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1),
        transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 10;
}

.sidebar-chat-item:hover .chat-item-actions,
.sidebar-chat-item.active .chat-item-actions,
.chat-item-actions:has(.chat-menu-dropdown) {
    opacity: 1;
    transform: translateX(0);
}

.menu-trigger-btn {
    background: none;
    border: none;
    padding: 2px;
    color: var(--text-tertiary);
    cursor: pointer;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease, background 0.2s ease;
}

.menu-trigger-btn:hover {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.04);
}

.dark .menu-trigger-btn:hover {
    background: rgba(255, 255, 255, 0.08);
}

.chat-menu-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    z-index: 1000;
    width: 170px;
    /* Slightly wider for better spacing */
    background: #ffffff;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    padding: 6px;
    margin-top: 6px;
    transform-origin: top right;
    animation: menuSmoothEntry 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.chat-menu-dropdown.placement-top {
    top: auto;
    bottom: 100%;
    margin-top: 0;
    margin-bottom: 6px;
    transform-origin: bottom right;
    animation: menuSmoothEntryUp 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes menuSmoothEntry {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-6px);
    }

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

@keyframes menuSmoothEntryUp {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(6px);
    }

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

.dark .chat-menu-dropdown {
    background: #2d2d2d;
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.5);
}

.menu-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 10px;
    border: none;
    background: none;
    color: #4b5563;
    font-size: 14.2px;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.15s ease;
}

.dark .menu-item {
    color: #d1d5db;
}

.menu-item:hover {
    background: #f3f4f6;
}

.dark .menu-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.menu-item.delete {
    color: #ef4444;
}

.menu-item.delete:hover {
    background: rgba(239, 68, 68, 0.05);
}

.menu-separator {
    height: 1px;
    background: #f3f4f6;
    margin: 4px 0;
}

.dark .menu-separator {
    background: rgba(255, 255, 255, 0.05);
}

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

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

.dark .chat-menu-dropdown {
    background: var(--bg-sidebar-dropdown, rgba(35, 35, 35, 0.95));
    border-color: rgba(255, 255, 255, 0.08);
}

.menu-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border: none;
    background: none;
    color: var(--text-secondary);
    font-size: 13.5px;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.15s ease, opacity 0.15s ease;
}

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

.menu-item span {
    flex: 1;
    text-align: left;
}

.menu-item svg {
    opacity: 0.7;
}

.menu-item.delete {
    color: #ef4444;
}

.menu-item.delete:hover {
    background: rgba(239, 68, 68, 0.1);
}

.menu-item.delete svg {
    opacity: 1;
}

.menu-separator {
    height: 1px;
    background: var(--border-sidebar, rgba(0, 0, 0, 0.05));
    margin: 4px 6px;
}

.dark .menu-separator {
    background: rgba(255, 255, 255, 0.08);
}

.sidebar-toggle,
.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, opacity 0.2s;
}

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

/* Removed old new-chat-btn styles as they are now unified under .nav-item */

.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0.75rem;
    margin-top: 0.5rem;
}

.conversation-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.75rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    border: 1px solid transparent;
    margin-bottom: 2px;
}

.conv-icon-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pin-hint-icon {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--brand-primary);
    color: white;
    border-radius: 50%;
    padding: 1px;
    border: 1px solid var(--bg-surface);
}

.sidebar-section-header {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    padding: 1rem 0.75rem 0.5rem;
    opacity: 0.6;
}

.sidebar-archived-toggle {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.75rem;
    margin: 0.5rem 0.75rem;
    background: rgba(var(--bg-canvas-rgb), 0.3);
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all 0.2s;
    border: 1px dashed var(--border-light);
}

.sidebar-archived-toggle:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
    border-style: solid;
}

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

.conversation-item.active {
    background: var(--brand-light);
    /* Tint active item */
    border-color: rgba(99, 102, 241, 0.1);
    /* Subtle color border */
}

/* In dark mode we might want a different active state */
.dark .conversation-item.active {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.05);
}

.conversation-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.conversation-item.active .conversation-title {
    color: var(--text-primary);
    font-weight: 500;
}

.edit-title-input {
    flex: 1;
    background: var(--bg-canvas);
    border: 1px solid var(--brand-primary);
    border-radius: 0.25rem;
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    outline: none;
}

.menu-btn {
    opacity: 0;
    transition: opacity 0.2s;
    padding: 0.25rem;
    border-radius: 0.25rem;
    color: var(--text-tertiary);
    background: none;
    border: none;
    cursor: pointer;
}

.conversation-item:hover .menu-btn,
.conversation-item.active .menu-btn {
    opacity: 1;
}

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

/* Legacy footer removed */

.theme-toggle:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
    border-color: var(--border-medium);
}

/* Context Menu */
.context-menu {
    position: absolute;
    right: 0.5rem;
    top: 80%;
    background: rgba(var(--bg-canvas-rgb), 0.98);
    backdrop-filter: blur(24px);
    border: 1px solid var(--border-light);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    min-width: 140px;
    padding: 0.25rem;
    animation: popIn 0.15s cubic-bezier(0.16, 1, 0.3, 1);
}

.dark .context-menu {
    background: rgba(18, 18, 21, 0.98);
    border-color: rgba(255, 255, 255, 0.12);
}

.context-menu button {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-primary);
    border-radius: 0.25rem;
    transition: background 0.15s;
}

.context-menu button:hover {
    background: var(--bg-surface-hover);
}

.context-menu button.danger {
    color: var(--status-error);
}

.context-menu button.danger:hover {
    background: rgba(239, 68, 68, 0.1);
}

.context-menu .divider {
    height: 1px;
    background: var(--border-light);
    margin: 0.25rem 0;
}

/* Premium Rename Input */
.premium-rename-input {
    width: 100%;
    padding: 0.25rem 0.6rem;
    background: rgba(var(--bg-surface-rgb), 0.5);
    backdrop-filter: blur(8px);
    border: 1px solid var(--brand-primary);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: inherit;
    outline: none;
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.15);
    transition: all 0.2s ease;
}

.premium-rename-input:focus {
    background: var(--bg-surface);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25), var(--shadow-glow);
}

.dark .premium-rename-input {
    background: rgba(var(--bg-surface-rgb), 0.3);
    border-color: var(--brand-primary);
}

.header-rename-input {
    max-width: 250px;
    height: 32px;
    font-weight: 600;
}

@media (max-width: 768px) {
    .header-rename-input {
        max-width: 150px;
    }
}

/* Truly Centered Opaque Rename Modal - Scoped to Main Content */
.rename-modal-overlay {
    position: absolute;
    /* Scoped to .main-content */
    top: 60px;
    /* Below Header */
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.05);
    /* Very light overlay, no blur to keep header sharp */
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1500;
    animation: fadeIn 0.3s ease-out;
}

.rename-modal-content {
    background: var(--bg-canvas);
    /* Opaque background */
    width: 90%;
    max-width: 440px;
    padding: 2.25rem;
    border-radius: 1.5rem;
    border: 1px solid var(--border-light);
    box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.3);
    animation: modalPop 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
    margin-top: -30px;
    /* Offset the top:60px to center truly in the available session space */
}

.dark .rename-modal-content {
    background: #18181b;
    /* Zinc 900 - Opaque */
    border-color: rgba(255, 255, 255, 0.1);
}

.rename-modal-title {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    letter-spacing: -0.02em;
}

.rename-modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.875rem;
    margin-top: 2rem;
}

.modal-btn {
    padding: 0.7rem 1.75rem;
    border-radius: 0.75rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease-in-out;
    border: none;
    font-family: 'Outfit', sans-serif;
    letter-spacing: 0.01em;
}

.modal-btn:active {
    transform: scale(0.98);
}

.modal-btn-cancel {
    background: var(--bg-surface-hover);
    color: var(--text-secondary);
}

.modal-btn-cancel:hover {
    background: var(--border-light);
    color: var(--text-primary);
}

.modal-btn-save {
    background: var(--brand-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(var(--brand-primary-rgb), 0.2);
}

.modal-btn-save:hover {
    background: var(--brand-hover);
    box-shadow: 0 6px 16px rgba(var(--brand-primary-rgb), 0.3);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes modalPop {
    from {
        opacity: 0;
        transform: translateY(24px) scale(0.96);
    }

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

/* ========================================
   Main Content
   ======================================== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    height: 100%;
    position: relative;
    background: var(--bg-canvas);
    overflow-x: hidden;
    /* Prevent horizontal scroll on main area */
}

.top-bar {
    display: none;
    /* Desktop default */
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-light);
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-canvas);
}

/* Loading Bar */
.loading-bar {
    height: 2px;
    width: 100%;
    background: var(--bg-surface);
    overflow: hidden;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 50;
}

.loading-progress {
    height: 100%;
    width: 30%;
    background: linear-gradient(90deg, var(--brand-primary), var(--brand-hover));
    animation: loading 1.5s ease-in-out infinite;
}

@keyframes loading {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(400%);
    }
}

/* ========================================
   Messages Area
   ======================================== */
.messages-container {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    /* scroll-behavior is now handled dynamically in JavaScript to prevent jumps during session switching */
    padding-bottom: 2rem;
    overflow-anchor: none;
    overflow-x: hidden;
    scrollbar-gutter: stable;
    overscroll-behavior: contain;
}

.messages-container.transitioning {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.1s ease-out;
    /* Chỉ chuyển động mờ ảo khi chuyển session */
}

/* Container for messages and fixed elements like scroll-to-bottom */
.messages-section {
    flex: 1;
    min-height: 0;
    /* Important for flex child with overflow */
    position: relative;
    display: flex;
    flex-direction: column;
}

/* Specific spotlight for tour to prevent it being too large */
.tour-chat-spotlight {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 75%;
    pointer-events: none;
    z-index: -1;
    visibility: hidden;
}

/* Welcome Screen */
.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    animation: fadeIn 0.5s ease-out;
}

.welcome-icon {
    margin-bottom: 2rem;
    filter: drop-shadow(0 10px 15px rgba(99, 102, 241, 0.2));
}

.welcome-icon img {
    height: 80px;
    width: auto;
}

.welcome-screen h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    margin-bottom: 1.25rem;
    font-weight: 800;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--text-primary) 20%, #6366f1);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.04em;
}

.welcome-screen p {
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.6;
    font-size: 1.1rem;
    max-width: 600px;
}

.example-prompts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    width: 100%;
    max-width: 800px;
}

.example-prompts button {
    padding: 1rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: 0.75rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: left;
    transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
    line-height: 1.5;
}

.example-prompts button:hover {
    background: var(--bg-canvas);
    border-color: var(--brand-primary);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Messages - Breathable ChatGPT Layout */
.message {
    display: flex;
    gap: 0;
    padding: 1rem 1rem 1.25rem;
    /* More compact vertical padding */
    max-width: 800px;
    /* ChatGPT standard width */
    width: 100%;
    margin: 0 auto;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    border-bottom: 1px solid transparent;
    /* Ready for dividers if needed */
}

.message:hover {
    background: transparent;
    /* Remove hover background for a cleaner feel */
}

/* User Message - Mirrored to right */
.message.user {
    flex-direction: row-reverse;
    background: transparent;
}

.message.user .message-body {
    text-align: right;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.message.user .message-content {
    text-align: left;
    background: #f4f4f4;
    /* Minimalist ChatGPT light grey */
    padding: 12px 20px;
    /* Refined ChatGPT-like padding */
    border-radius: 1.5rem;
    /* Fully rounded ChatGPT style */
    display: block;
    width: fit-content;
    /* Trải chữ ra trước, bọc màu sau */
    max-width: 75%;
    /* Giới hạn tối đa 3/4 khu vực chat */
    min-width: 40px;
    box-shadow: none;
    /* No shadow for flat look */
    word-break: break-word;
    white-space: pre-wrap;
    align-self: flex-end;
}

.dark .message.user .message-content {
    background: #2f2f2f;
    /* Deep grey for dark mode ChatGPT style */
}

.message.user .message-footer {
    justify-content: flex-end;
    /* Căn nút sang phải cho người dùng */
}

.message.user .copy-toast {
    left: auto;
    right: 0;
}

/* Assistant Message - Open & Frameless */
.message.assistant {
    background: transparent;
    border: none;
    box-shadow: none;
    margin-top: 0;
    margin-bottom: 0;
}

.message-avatar {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border-radius: 0.75rem;
    background: var(--bg-surface);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s;
}

.message:hover .message-avatar {
    transform: scale(1.05);
}

.message.user .message-avatar {
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    color: #64748b;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, var(--brand-primary), #818cf8);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.message-body {
    flex: 1;
    min-width: 0;
}

/* Floating Message Actions - Minimalist ChatGPT Style */
.message-footer {
    position: relative;
    /* Moved back into flow */
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    opacity: 0;
    transition: all 0.2s ease;
    z-index: 1;
    width: 100%;
}

.message:hover .message-footer {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.footer-actions-right {
    display: flex;
    gap: 0.25rem;
}

.footer-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    /* No background by default */
    border: none;
    /* No border */
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: all 0.15s ease;
    box-shadow: none;
    position: relative;
    /* Crucial for toast positioning */
}

.footer-btn:hover {
    background: rgba(var(--brand-primary-rgb), 0.08);
    /* Subtle hover bg */
    color: var(--brand-primary);
}

.footer-btn svg {
    color: var(--text-tertiary);
    transition: color 0.2s;
}

.footer-btn:hover svg {
    color: var(--brand-primary);
}

.footer-btn.expand-toggle {
    color: var(--brand-primary);
}

.footer-btn.expand-toggle:hover {
    background: rgba(var(--brand-primary-rgb), 0.12);
}

.footer-btn.copy-btn.copied {
    color: var(--status-success);
}

/* Export Dropdown */
.export-dropdown-wrapper {
    position: relative;
}

.export-menu {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 0;
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
    min-width: 160px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 2px;
    animation: menuSmoothEntryUp 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.message.user .export-menu {
    left: auto;
    right: 0;
}

.export-menu button {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
    background: transparent;
    border: none;
    border-radius: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    white-space: nowrap;
}

.export-menu button:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
}

.export-menu button svg {
    color: var(--text-tertiary);
}

.export-menu button:hover svg {
    color: var(--brand-primary);
}

.copy-toast {
    position: absolute;
    bottom: calc(100% + 4px);
    /* Move closer to icon */
    left: 50%;
    transform: translateX(-50%);
    background: var(--brand-primary);
    color: white;
    padding: 2px 8px;
    /* Slimmer toast */
    border-radius: 4px;
    font-size: 0.65rem;
    font-weight: 600;
    white-space: nowrap;
    animation: premiumToast 1.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    pointer-events: none;
    z-index: 100;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3), var(--shadow-glow);
    letter-spacing: 0.01em;
}

@keyframes premiumToast {
    0% {
        opacity: 0;
        transform: translate(-50%, 12px) scale(0.8);
    }

    15% {
        opacity: 1;
        transform: translate(-50%, 0) scale(1.05);
    }

    20% {
        opacity: 1;
        transform: translate(-50%, 0) scale(1);
    }

    85% {
        opacity: 1;
        transform: translate(-50%, 0) scale(1);
    }

    100% {
        opacity: 0;
        transform: translate(-50%, -20px) scale(0.9);
    }
}

.message-actions button.copied {
    color: var(--status-success) !important;
    background: rgba(16, 185, 129, 0.1) !important;
    border-radius: 0.25rem;
}

.message-actions button.copied svg {
    animation: successPop 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    filter: drop-shadow(0 0 4px rgba(16, 185, 129, 0.4));
}

@keyframes successPop {
    0% {
        transform: scale(0.5) rotate(-20deg);
        opacity: 0;
    }

    50% {
        transform: scale(1.2) rotate(10deg);
    }

    100% {
        transform: scale(1) rotate(0);
        opacity: 1;
    }
}

/* Streaming cursor - ChatGPT style */
.message.assistant.streaming .message-content::after {
    content: '';
    display: inline-block;
    width: 6px;
    height: 1.1em;
    background-color: var(--brand-primary);
    vertical-align: middle;
    margin-left: 4px;
    border-radius: 1px;
    animation: cursor-blink 0.8s s-curve infinite;
}

@keyframes cursor-blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

/* Smooth fade-in for streamed text bits */
.message.assistant.streaming .message-content p {
    display: inline;
}

/* Collapsible Content */
.collapsible-content {
    width: 100%;
    display: flex;
    flex-direction: column;
}

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

.collapsible-content.truncated .content-inner {
    position: relative;
    mask-image: linear-gradient(to bottom, black 50%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 50%, transparent 100%);
}

/* Collapsible Content - Fade effect refined */
.collapsible-content.truncated .content-inner {
    position: relative;
    mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
}

/* ========================================
   Input Container
   ======================================== */
.input-container {
    padding: 1rem 1.5rem 2rem;
    max-width: 850px;
    margin: 0 auto;
    width: 100%;
    flex-shrink: 0;
    background: linear-gradient(to top, var(--bg-canvas) 80%, transparent);
    /* Fade out top */
}

.input-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(var(--bg-surface-rgb), 0.7);
    backdrop-filter: blur(24px) saturate(160%);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    border: 1px solid var(--border-light);
    border-radius: 1.25rem;
    padding: 0.75rem 1rem;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    /* Exclude color/background/border from transition to prevent flickering on theme switch */
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.04), var(--shadow-sm);
    position: relative;
    z-index: 10;
}

.input-wrapper:focus-within {
    border-color: var(--brand-primary);
    background: rgba(var(--bg-canvas-rgb), 0.9);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.1);
}

.drag-overlay {
    position: absolute;
    inset: 0;
    background: rgba(var(--brand-primary-rgb, 99, 102, 241), 0.1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 1rem;
    border: 2px dashed var(--brand-primary);
    pointer-events: none;
    animation: fadeIn 0.2s ease-out;
}

.drag-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0 1rem;
}

.drag-icon {
    color: var(--brand-primary);
    animation: pulseGlow 1.5s infinite ease-in-out;
}

.drag-text {
    font-family: 'Outfit', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--brand-primary);
    letter-spacing: 0.025em;
}

@keyframes pulseGlow {
    0% {
        transform: scale(1);
        opacity: 0.8;
        filter: drop-shadow(0 0 0px var(--brand-primary));
    }

    50% {
        transform: scale(1.1);
        opacity: 1;
        filter: drop-shadow(0 0 8px var(--brand-primary));
    }

    100% {
        transform: scale(1);
        opacity: 0.8;
        filter: drop-shadow(0 0 0px var(--brand-primary));
    }
}

/* Dark mode specific overlay refinement */
.dark .drag-overlay {
    background: rgba(0, 0, 0, 0.4);
    border-color: var(--brand-primary);
}

.attach-btn {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 50%;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

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

.input-wrapper textarea {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    resize: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.5;
    padding: 0.35rem 0.25rem;
    max-height: 200px;
    min-height: 24px;
}

.input-wrapper textarea::placeholder {
    color: var(--text-tertiary);
}

.send-btn {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 0.5rem;
    /* Rounded rect looks more modern than circle sometimes, but let's stick to circle or soft square */
    border-radius: 50%;
    background: var(--brand-primary);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, opacity 0.2s, box-shadow 0.2s;
    /* Exclude color/background from transition to prevent flickering on theme switch */
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    background: var(--brand-hover);
    transform: scale(1.05);
}

.send-btn:disabled {
    background: var(--bg-surface-hover);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

.input-hint {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: 0.75rem;
}

/* Upload Previews */
/* Image Attachment Area */
.image-attachment-area {
    background: rgba(var(--bg-surface-rgb), 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-light);
    border-radius: 1rem;
    padding: 0.75rem;
    margin-bottom: 0.75rem;
    animation: slideUp 0.3s ease-out;
}

.attachment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-light);
}

.attachment-counter {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.attachment-counter strong {
    color: var(--brand-primary);
}

.clear-all-btn {
    background: transparent;
    border: none;
    color: var(--status-error);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: background 0.2s;
}

.clear-all-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    /* Based on status-error red */
}

.uploaded-images-preview {
    display: flex;
    gap: 0.75rem;
    overflow-x: auto;
    padding: 0.25rem 0;
    scrollbar-width: thin;
}

.preview-item {
    position: relative;
    width: 72px;
    height: 72px;
    flex-shrink: 0;
    border-radius: 0.75rem;
    overflow: hidden;
    border: 2px solid var(--bg-surface);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    background: var(--bg-canvas);
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.preview-item.clickable {
    cursor: pointer;
}

.preview-item.clickable:hover {
    transform: scale(1.05);
}

/* Message Image Previews (Compact) */
.message-images-list {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.25rem;
    overflow-x: auto;
    padding-bottom: 4px;
    /* Tiny bit of room for shadow/border */
    scrollbar-width: none;
    max-width: 100%;
}

/* Bring text closer to images when they exist - but not squashed, and keep it centered */
.message-images-list+.collapsible-content .message-content {
    padding: 10px 20px !important;
}

.message-images-list+.collapsible-content .message-content p:first-child {
    margin-top: 0 !important;
}

.message-images-list::-webkit-scrollbar {
    display: none;
}

.message-image-preview {
    position: relative;
    width: 84px;
    height: 84px;
    flex-shrink: 0;
    border-radius: 0.75rem;
    overflow: hidden;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    background: var(--bg-surface);
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.message-image-preview:hover {
    transform: scale(1.05);
    border-color: var(--brand-primary);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
}

.message-image-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.2s;
}

.message-image-preview:hover img {
    opacity: 0.9;
}

.remove-img-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    color: white;
    border: none;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    z-index: 2;
}

.remove-img-btn:hover {
    background: #ef4444;
    /* status-error */
    transform: scale(1.1);
}

/* Error Toast */
.upload-error-toast {
    position: absolute;
    bottom: calc(100% + 1rem);
    left: 50%;
    transform: translateX(-50%);
    background: #ef4444;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    box-shadow: var(--shadow-lg);
    z-index: 100;
    animation: fadeInUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

/* Premium Image Viewer Overlay - Ultra-thin and blurred */
.premium-viewer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(var(--bg-canvas-rgb), 0.15);
    /* Even thinner background */
    backdrop-filter: blur(60px) saturate(200%);
    /* Consistent saturation for color vibrance */
    -webkit-backdrop-filter: blur(60px) saturate(200%);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    animation: fadeInOverlay 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    padding: 2rem;
}

.premium-viewer-overlay.is-restored {
    animation: none !important;
}

@keyframes fadeInOverlay {
    from {
        opacity: 0;
        backdrop-filter: blur(0px);
    }

    to {
        opacity: 1;
        backdrop-filter: blur(60px) saturate(200%);
        -webkit-backdrop-filter: blur(60px) saturate(200%);
    }
}

.viewer-top-bar {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    right: 1.5rem;
    height: 64px;
    background: rgba(var(--bg-surface-rgb), 0.4);
    border: 1px solid var(--border-light);
    border-radius: 1.25rem;
    backdrop-filter: blur(24px) saturate(160%);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    z-index: 2010;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08), var(--shadow-sm);
}

.viewer-info {
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
    font-family: 'Outfit', sans-serif;
    letter-spacing: 0.02em;
}

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

.viewer-actions button {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.viewer-actions button:hover {
    background: var(--bg-surface-hover);
    color: var(--brand-primary);
    border-color: var(--border-light);
    transform: none;
    /* Removed jumpy translateY */
}

.viewer-divider {
    width: 1px;
    height: 24px;
    background: var(--border-light);
    margin: 0 0.5rem;
}

.viewer-close-btn {
    background: rgba(var(--status-error-rgb, 239, 68, 68), 0.1) !important;
    color: var(--status-error) !important;
}

.viewer-close-btn:hover {
    background: var(--status-error) !important;
    color: white !important;
    border-color: transparent !important;
}

.viewer-image-container {
    flex: 1;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin: 4rem 0;
    position: relative;
}

/* Layered glows for depth and theme coordination */
.viewer-image-container::before {
    content: '';
    position: absolute;
    width: 80%;
    height: 80%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 60%);
    pointer-events: none;
    z-index: -1;
    animation: pulseGlowViewer 8s infinite alternate ease-in-out;
}

.viewer-image-container::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(var(--brand-primary-rgb), 0.05) 0%, transparent 80%);
    pointer-events: none;
    z-index: -1;
}

@keyframes pulseGlowViewer {
    0% {
        transform: scale(1) opacity(0.5);
    }

    100% {
        transform: scale(1.2) opacity(0.8);
    }
}

.viewer-main-image {
    max-width: 90vw;
    max-height: 75vh;
    object-fit: contain;
    border-radius: 1.5rem;
    border: 1px solid rgba(var(--brand-primary-rgb), 0.1);
    box-shadow: 0 40px 100px rgba(0, 0, 0, 0.3), 0 0 40px rgba(var(--brand-primary-rgb), 0.1);
    user-select: none;
    pointer-events: auto;
    background: var(--bg-canvas);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Nav Buttons */
.viewer-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(var(--bg-surface-rgb), 0.6);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 2005;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-md);
}

.viewer-nav-btn:hover {
    background: var(--brand-primary);
    color: white;
    border-color: transparent;
    box-shadow: 0 0 20px rgba(var(--brand-primary-rgb), 0.3);
}

.viewer-nav-btn:active {
    scale: 0.95;
}

.viewer-nav-btn.prev {
    left: 2rem;
}

.viewer-nav-btn.next {
    right: 2rem;
}

/* Thumbnails Strip */
.viewer-thumbnails-strip {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.75rem;
    padding: 0.65rem;
    background: rgba(var(--bg-surface-rgb), 0.6);
    backdrop-filter: blur(24px) saturate(160%);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    border: 1px solid var(--border-light);
    border-radius: 1.25rem;
    z-index: 2010;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12), var(--shadow-sm);
}

.viewer-thumb-item {
    width: 52px;
    height: 52px;
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0.5;
    background: var(--bg-canvas);
}

.viewer-thumb-item:hover {
    opacity: 1;
    transform: translateY(-4px) scale(1.1);
}

.viewer-thumb-item.active {
    opacity: 1;
    border-color: var(--brand-primary);
    box-shadow: 0 0 15px rgba(var(--brand-primary-rgb), 0.4);
    transform: translateY(-4px) scale(1.1);
}

.viewer-thumb-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* === ChatGPT-Style Sidebar Redesign === */
.sidebar-container {
    width: 260px;
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    position: relative;
    overflow: hidden;
    will-change: width;
    box-sizing: border-box;
    /* Performance optimization */
    transform: translateZ(0);
    backface-visibility: hidden;
}

:root {
    --bg-sidebar: #f9f9f9;
}

.dark {
    --bg-sidebar: #171717;
}

/* Removing sidebar-reopen-btn as we now use a slim sidebar state */

.sidebar-container.closed {
    width: 60px;
    /* Slimmer width as requested */
    transform: none;
    opacity: 1;
}

/* Restored original smooth transition for all text-like elements */
.nav-item span,
.nav-item-pill span,
.brand-name,
.profile-info,
.profile-name,
.profile-plan,
.chat-item-text,
.chat-item-text span,
.chat-pin-icon,
.history-label span,
.history-label svg,
.upgrade-btn {
    transition: opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1), transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    opacity: 1;
}

/* Transitions for elements with dynamic opacity (active/hover) */
.active-indicator,
.chat-item-actions {
    transition: opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1), transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Final Unified Alignment: 68px (bar) - 20px (margins) = 48px inner. Center = 24px. Icon 32px? wait. 
   Margin: 10px left. Padding-left: 8px. Total 18px left. Icon 32px. 
   18 + 32 = 50px right edge of icon. 
   68 width. 18px remaining on right. 
   So 18px Left space, 18px Right space. Perfect center!
*/
/* Unified constant geometry for open/closed states */
.sidebar-container.closed .sidebar-brand,
.sidebar-container.closed .nav-item,
.sidebar-container.closed .nav-item-pill,
.sidebar-container.closed .profile-section,
.sidebar-container.closed .collapsed-footer-actions {
    margin: 2px 8px !important;
    width: calc(100% - 16px) !important;
    justify-content: flex-start !important;
}

.sidebar-container.closed .nav-item,
.sidebar-container.closed .nav-item-pill {
    padding-left: 12px !important;
}

.sidebar-container.closed .sidebar-brand,
.sidebar-container.closed .profile-section {
    padding-left: 6px !important;
}

.sidebar-container.closed .nav-item-icon {
    margin: 0 !important;
    width: 20px !important;
    min-width: 20px !important;
    height: 20px !important;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: none !important;
}

.sidebar-container.closed .profile-avatar,
.sidebar-container.closed .brand-logo {
    margin: 0 !important;
    width: 32px !important;
    min-width: 32px !important;
    height: 32px !important;
    transform: none !important;
    /* Avatar must stay stationary when sidebar closes */
    display: flex;
    align-items: center;
    justify-content: center;
    transform: none !important;
}

/* Merged and stabilized icons */

.sidebar-container.closed .brand-name,
.sidebar-container.closed .nav-item span,
.sidebar-container.closed .nav-item-pill span,
.sidebar-container.closed .profile-info,
.sidebar-container.closed .chat-item-text,
.sidebar-container.closed .chat-item-text span,
.sidebar-container.closed .chat-pin-icon,
.sidebar-container.closed .history-label span,
.sidebar-container.closed .history-label svg,
.sidebar-container.closed .upgrade-btn,
.sidebar-container.closed .profile-name,
.sidebar-container.closed .profile-plan,
.sidebar-container.closed .active-indicator,
.sidebar-container.closed .chat-item-actions,
.sidebar-container.closed .history-empty {
    opacity: 0;
    pointer-events: none;
    transform: translateX(-15px);
    transition: opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1), transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Toggle button: only visible when sidebar is open */
.toggle-sidebar-trigger {
    cursor: pointer;
    color: var(--text-tertiary);
    transition: background 0.25s ease, color 0.2s ease, box-shadow 0.25s ease, transform 0.2s ease;
    padding: 10px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid transparent;
    position: relative;
}

.toggle-sidebar-trigger:hover {
    color: var(--text-primary);
    background: var(--bg-surface-hover);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.dark .toggle-sidebar-trigger:hover {
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.toggle-sidebar-trigger:active {
    opacity: 0.7;
    transform: scale(0.96);
}

.toggle-sidebar-trigger svg {
    transition: color 0.25s ease;
}

/* Hide toggle button when sidebar is closed */
.sidebar-container.closed .toggle-sidebar-trigger {
    display: none;
}

/* Handle chat item background independently to avoid double-opacity fade */
.sidebar-container.closed .sidebar-chat-item {
    background: transparent !important;
    pointer-events: none;
}

.sidebar-container.closed .sidebar-top-nav {
    padding: 0;
}

.sidebar-container.closed .nav-header {
    justify-content: flex-start;
    padding: 0;
    position: relative;
    /* Anchor for absolute toggle button */
}

/* Clickable area when sidebar is closed - from "Dự án" down to footer (but not including footer) */
.sidebar-clickable-area {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    cursor: pointer;
    pointer-events: auto;
    z-index: 1;
    /* Covers only sidebar-history area, not footer */
}

/* Hide clickable area when sidebar is open */
.sidebar-container.open .sidebar-clickable-area {
    display: none;
}

/* When sidebar is closed, ensure nav items and header don't block clicks */
.sidebar-container.closed .nav-header {
    position: relative;
    z-index: 10;
    pointer-events: auto;
}

.sidebar-container.closed .nav-list {
    position: relative;
    z-index: 10;
    pointer-events: auto;
}

/* sidebar-history should allow clicks to pass through when closed */
.sidebar-container.closed .sidebar-history {
    position: relative;
    z-index: 6;
    pointer-events: none;
    /* Allow clicks to pass through to clickable area */
}

/* Footer should not be clickable when sidebar is closed */
.sidebar-container.closed .sidebar-footer {
    position: relative;
    z-index: 10;
    pointer-events: auto;
    /* Footer keeps its normal functionality */
}

/* sidebar-history should keep pointer-events: none when closed for fade effect */

/* Logo stays stationary during all transitions */
.sidebar-brand {
    transition: opacity 0.2s ease, transform 0.2s ease;
    transform: none !important;
    /* Always stationary */
}

.sidebar-container.closed .sidebar-brand {
    opacity: 1;
    transform: none !important;
    /* Keep stationary and visible by default */
}

/* Logo always visible when sidebar is closed */

/* Profile avatar stays stationary during all transitions */
.profile-avatar {
    transform: none !important;
    /* Avatar never moves */
    transition: none !important;
}

.profile-section {
    transform: none !important;
    /* Profile section never moves */
    transition: background 0.2s ease;
    /* Only allow background color transitions */
}

.sidebar-inner {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
}

/* --- Top Navigation --- */
/* --- Top Navigation --- */
.sidebar-top-nav {
    padding: 0;
    /* Removing padding to prevent jump */
}

.nav-header {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    padding: 0;
    /* Removed padding to ensure logo is stationary at 30px center */
    position: relative;
    /* Anchor for absolute toggle button when closed */
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    padding-left: 6px;
    /* Constant anchor */
    margin: 0 8px;
    /* Constant margin */
    height: 40px;
    /* Enforce height */
}

.brand-logo {
    width: 32px !important;
    height: 32px !important;
    min-width: 32px !important;
    min-height: 32px !important;
    flex: 0 0 32px !important;
    aspect-ratio: 1 / 1 !important;
    border-radius: 10px;
    object-fit: cover;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transform: translateY(-0.5px);
    /* Optical adjustment to center with text */
}

.sidebar-brand .brand-name {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    min-width: 0;
}

.toggle-sidebar-trigger {
    cursor: pointer;
    color: var(--text-tertiary);
    transition: background 0.25s ease, color 0.2s ease, box-shadow 0.25s ease, transform 0.2s ease;
    padding: 10px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid transparent;
    position: relative;
}

.toggle-sidebar-trigger:hover {
    color: var(--text-primary);
    background: var(--bg-surface-hover);
    /* Standardized hover for distinct area */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.dark .toggle-sidebar-trigger:hover {
    background: rgba(255, 255, 255, 0.12);
    /* Slightly clearer in dark mode */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.toggle-sidebar-trigger:active {
    opacity: 0.7;
    transform: scale(0.96);
}

.toggle-sidebar-trigger svg {
    transition: color 0.25s ease;
}

/* Static hover: no translation or scaling */
.toggle-sidebar-trigger:hover svg {
    transform: none;
}

/* Cleaned up conflicting overrides */

/* Base class for all unified nav items */
.nav-item,
.nav-item-pill {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0 12px;
    /* Constant padding */
    margin: 2px 8px;
    /* Constant margin */
    height: 44px;
    flex-shrink: 0;
    border-radius: 10px;
    overflow: hidden;
    /* Prevent text wrapping during transition */
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    color: #475569;
    /* Slate 600 for better contrast in light mode */
    font-size: 0.85rem;
    font-weight: 600;
    /* Bolder as requested */
    width: calc(100% - 16px);
    /* Constant width logic */
    text-align: left;
    background: transparent;
    border: none;
    cursor: pointer;
}

.dark .nav-item,
.dark .nav-item-pill {
    color: var(--text-secondary);
    /* Retain zinc-400 for dark mode */
}

.nav-item:hover,
.nav-item-pill:hover:not(.disabled) {
    background: var(--bg-surface-hover);
    /* Darker hover for clarity in light mode */
    color: var(--text-primary);
}

.dark .nav-item:hover,
.dark .nav-item-pill:hover:not(.disabled) {
    background: var(--bg-surface-hover);
}

.nav-item-pill.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.shortcut-hint {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: rgba(var(--bg-canvas-rgb), 0.3);
    padding: 3px 9px;
    border-radius: 6px;
    border: 1px solid var(--border-medium);
    opacity: 0;
    transform: translateX(4px);
    transition: all 0.2s ease;
    font-weight: 700;
    letter-spacing: 0.04em;
    pointer-events: none;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    line-height: 1;
}

.nav-item:hover .shortcut-hint,
.context-menu button:hover .shortcut-hint {
    opacity: 1;
    transform: translateX(0);
}

.dark .shortcut-hint {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    color: var(--text-secondary);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.dark .nav-item:hover .shortcut-hint,
.dark .context-menu button:hover .shortcut-hint {
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.12);
}

/* Specific icon colors for unified nav items */
.nav-item .nav-item-icon,
.nav-item-pill .nav-item-icon {
    color: #64748b;
    /* Slate 500 for better contrast in light mode */
}

.dark .nav-item .nav-item-icon,
.dark .nav-item-pill .nav-item-icon {
    color: var(--text-tertiary);
}

.nav-item:hover .nav-item-icon,
.nav-item-pill:hover:not(.disabled) .nav-item-icon {
    color: var(--brand-primary, #6366f1);
}

.dark .nav-item:hover .nav-item-icon,
.dark .nav-item-pill:hover:not(.disabled) .nav-item-icon {
    color: var(--brand-primary, #818cf8);
}

.nav-item-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    transition: transform 0.2s;
}

/* Unified hover icon behavior */
.nav-item:hover .nav-item-icon,
.nav-item-pill:hover .nav-item-icon {
    color: var(--brand-primary, #6366f1);
}

.nav-item:active {
    transform: scale(0.98);
}

.badge-new {
    font-size: 0.65rem;
    background: rgba(99, 102, 241, 0.1);
    color: #6366f1;
    padding: 2px 8px;
    border-radius: 999px;
    margin-left: auto;
    font-weight: 700;
    letter-spacing: 0.02em;
}

/* Removed search-btn overrides to maintain consistency across all nav items */

.dark .badge-new {
    background: rgba(99, 102, 241, 0.2);
    color: #818cf8;
}

/* --- Chat History --- */
.sidebar-history {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    margin-top: 1rem;
    position: relative;
    margin-left: 8px;
    /* Added margin to show tour borders on the left */
}

/* Removed global opacity to allow individual fading */
.sidebar-container.closed .sidebar-history {
    pointer-events: none;
}

.sidebar-container.closed .history-scroll-area {
    overflow: hidden;
}

.history-label {
    padding: 0 1rem 0.5rem;
    /* Balanced with 8px margin */
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: none;
}

.history-scroll-area {
    flex: 1;
    overflow-y: auto;
    padding: 0 0.75rem 1rem;
}

.history-section {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.history-empty {
    padding: 2rem 1rem;
    /* Balanced with 8px margin */
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.85rem;
    font-style: italic;
    transition: opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1), transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}


/* --- Profile Footer --- */
.sidebar-footer {
    padding: 0.5rem 0 1.25rem;
    /* Lowered the divider line by reducing top padding */
    border-top: 1px solid var(--border-light);
    background: var(--bg-sidebar);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1), padding 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    /* Exclude color/background/border from transition to prevent flickering on theme switch */
    display: flex;
    flex-direction: column-reverse;
    /* Pin the 1st DOM child (Profile) to absolute bottom */
    gap: 0;
    /* Gap managed by margins of children to avoid jumping */
}

.sidebar-container.closed .sidebar-footer {
    padding: 0.75rem 0;
    gap: 0;
}

.collapsed-footer-actions {
    display: flex;
    flex-direction: column;
    padding-bottom: 8px;
    /* Constant spacing from avatar below */
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    max-height: 100px;
    opacity: 1;
    overflow: hidden;
}

.sidebar-container.open .collapsed-footer-actions {
    max-height: 0;
    opacity: 0;
    margin: 0;
    pointer-events: none;
}

.footer-icon-btn {
    width: 24px !important;
    height: 24px !important;
    min-width: 24px !important;
    flex: 0 0 24px !important;
    padding-left: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    color: var(--text-tertiary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1), transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), background 0.2s, color 0.2s;
    opacity: 1;
}

.sidebar-container.open .footer-icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 12px;
}

/* Center icon when sidebar is closed and fade it out */
.sidebar-container.closed .footer-icon-btn {
    padding-left: 0 !important;
    margin: 0 auto;
    opacity: 0;
    pointer-events: none;
    transform: translateX(-15px);
}

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

.profile-section {
    display: flex;
    align-items: center;
    gap: 12px;
    /* Increased gap for balanced spacing */
    padding: 0 0 0 6px;
    /* Vertical padding removed, using fixed height */
    margin: 0 8px;
    width: calc(100% - 16px);
    height: 52px !important;
    /* Strictly fixed height */
    min-height: 52px !important;
    max-height: 52px !important;
    border-radius: 0.75rem;
    cursor: pointer;
    transition: background 0.2s ease;
    /* Only background transitions, no transform */
    overflow: hidden;
    flex-shrink: 0;
    transform: none !important;
    /* Profile section never moves */
}

/* Merged with base profile-section rules and unified alignment */

.profile-section:hover {
    background: var(--bg-surface-hover);
}

.profile-avatar {
    width: 32px !important;
    height: 32px !important;
    min-width: 32px !important;
    min-height: 32px !important;
    max-width: 32px !important;
    max-height: 32px !important;
    flex: 0 0 32px !important;
    aspect-ratio: 1 / 1 !important;
    flex-shrink: 0 !important;
    border-radius: 50%;
    overflow: hidden;
    background: var(--bg-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    transform: none !important;
    /* Avatar never moves - keep stationary */
    transition: none !important;
    /* No transitions on avatar */
    backface-visibility: hidden;
}

.avatar-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: #7c3aed;
    /* Example purple */
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 700;
}

.avatar-circle.small {
    width: 100%;
    height: 100%;
    font-size: 0.9rem;
    border-radius: 50%;
}

.profile-info {
    flex: 1;
    min-width: 0;
}

.profile-name {
    font-size: 0.875rem;
    font-weight: 700;
    /* Bolder for prominence */
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.2;
}

.profile-plan {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-tertiary);
    opacity: 0.8;
}

.upgrade-btn {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 12px;
    border: 1px solid var(--border-light);
    background: var(--bg-surface);
    color: var(--text-primary);
    transition: transform 0.2s, opacity 0.2s, box-shadow 0.2s;
    /* Exclude color/background/border from transition to prevent flickering on theme switch */
    flex-shrink: 0;
}

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

/* Modal centered */
.modal-overlay.centered {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    padding: 1.5rem;
    animation: fadeIn 0.3s ease-out;
}

.glass {
    background: var(--bg-modal);
    backdrop-filter: blur(32px);
    -webkit-backdrop-filter: blur(32px);
    border: 1px solid var(--border-light);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.3);
}

/* Skip entrance animations when restoring after page refresh */
.no-animation {
    animation: none !important;
}

.no-animation .settings-container,
.no-animation .search-modal-container {
    animation: none !important;
}

.settings-container.no-animation,
.search-modal-container.no-animation {
    animation: none !important;
}

/* --- Settings Modal Redesign --- */
.settings-container {
    width: 100%;
    max-width: 820px;
    height: 640px;
    max-height: 90vh;
    display: flex;
    border-radius: 24px;
    overflow: hidden;
    animation: scaleIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
}

.settings-nav {
    width: 240px;
    background: #f1f5f9;
    /* Solid subtle gray for better contrast */
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    padding: 1.5rem 1rem;
}

.dark .settings-nav {
    background: #111113;
    /* Darker sidebar for prominence */
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 2rem;
    padding-left: 0.5rem;
    color: var(--text-primary);
}

.nav-items {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-tab {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    border-radius: 14px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
    border: none;
    /* Explicitly reset any inherited borders */
    outline: none;
    text-align: left;
    cursor: pointer;
}

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

.nav-tab.active {
    background: var(--brand-primary);
    color: white !important;
    box-shadow: 0 4px 15px rgba(var(--brand-primary-rgb), 0.3);
}

.dark .nav-tab.active {
    background: #3b82f6;
    /* Azure Blue for vibrant active state */
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.settings-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-modal);
    position: relative;
    padding: 2.5rem;
}

.body-close {
    all: unset;
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
}

.body-close:hover {
    background: var(--bg-surface-hover);
    color: #ef4444;
    transform: rotate(90deg);
}

.dark .body-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

.body-content {
    flex: 1;
    overflow-y: auto;
    padding-right: 0.5rem;
    scrollbar-width: none;
    /* Firefox */
    -ms-overflow-style: none;
    /* IE/Edge */
}

.body-content::-webkit-scrollbar {
    display: none;
}

.content-header h2 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.content-section {
    animation: fadeInSlideUp 0.4s ease-out;
}

/* --- General Groups --- */
.setting-group {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 0.5rem;
    border-bottom: 1px solid var(--border-light);
    transition: background 0.2s;
}

.setting-group:hover {
    background: rgba(var(--brand-primary-rgb), 0.02);
}

.group-info h3 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
    color: var(--text-primary);
}

.group-info p {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.toggle-pill {
    padding: 6px 18px;
    border-radius: 30px;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    border: 1.5px solid var(--border-light);
    background: transparent;
    color: var(--text-secondary);
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    outline: none !important;
    box-shadow: none !important;
}

.toggle-pill.on {
    background: #3b82f6;
    border-color: #3b82f6;
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2) !important;
}

.toggle-pill.on:hover {
    background: #2563eb;
    border-color: #2563eb;
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.3) !important;
}

.toggle-pill:not(.on):hover {
    border-color: #3b82f6;
    color: #3b82f6;
    background: rgba(59, 130, 246, 0.05);
}

/* --- User Profile Card --- */
.user-profile-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: 20px;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

.user-profile-card.editing {
    flex-direction: column;
    align-items: center;
    padding: 2.5rem 2rem;
    gap: 2rem;
    text-align: center;
}

.user-profile-card:hover {
    border-color: rgba(var(--brand-primary-rgb), 0.3);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.03);
}

.dark .user-profile-card {
    background: rgba(255, 255, 255, 0.02);
}

.card-avatar {
    position: relative;
    width: 64px;
    height: 64px;
}

.card-avatar.large {
    width: 110px;
    height: 110px;
    margin-bottom: 0.5rem;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: linear-gradient(135deg, #7c3aed, #3b82f6);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
}

.avatar-placeholder.large {
    font-size: 3rem;
}

.card-avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--bg-modal);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.avatar-edit-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.75rem;
    font-weight: 700;
    gap: 4px;
    border: 2px solid transparent;
}

.card-avatar:hover .avatar-edit-overlay {
    opacity: 1;
}

.card-form {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    text-align: left;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.form-group label {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding-left: 0.25rem;
}

.form-group input {
    padding: 0.85rem 1.1rem;
    background: var(--bg-canvas);
    border: 1.5px solid var(--border-light);
    border-radius: 14px;
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.form-group input:focus {
    outline: none;
    border-color: #3b82f6;
    background: var(--bg-surface);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.save-profile-btn {
    margin-top: 0.75rem;
    padding: 0.9rem;
    background: #3b82f6;
    color: white;
    border: none;
    border-radius: 14px;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.save-profile-btn:hover:not(:disabled) {
    background: #2563eb;
    filter: brightness(1.1);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.3);
}

.save-profile-btn:active:not(:disabled) {
    transform: scale(0.98);
}

.save-profile-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: var(--text-tertiary);
    box-shadow: none;
}

.account-danger-zone {
    border-top: 1px solid var(--border-light);
    padding-top: 2rem;
    margin-top: 1rem;
    width: 100%;
}

/* --- Appearance Grid --- */
.appearance-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.theme-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1.25rem;
    border-radius: 20px;
    border: 2.5px solid transparent;
    background: var(--bg-surface);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: left;
    cursor: pointer;
}

.theme-card:hover {
    background: var(--bg-surface-hover);
    transform: translateY(-2px);
}

.theme-card.active {
    border-color: var(--brand-primary);
    background: var(--bg-canvas);
    box-shadow: 0 8px 24px rgba(var(--brand-primary-rgb), 0.15);
}

.sidebar-avatar-img {
    width: 32px !important;
    height: 32px !important;
    min-width: 32px !important;
    min-height: 32px !important;
    max-width: 32px !important;
    max-height: 32px !important;
    aspect-ratio: 1 / 1 !important;
    object-fit: cover;
    border-radius: 50%;
    flex-shrink: 0 !important;
}

.theme-card span {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    /* Ensure contrast */
}

.theme-preview {
    height: 100px;
    border-radius: 12px;
}

.theme-preview.light {
    background: #ffffff;
    border: 1px solid #e2e8f0;
}

.theme-preview.dark {
    background: #18181b;
    border: 1px solid #27272a;
}


/* --- Archived List --- */
.archived-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.archived-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.85rem 1.25rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.archived-row:hover {
    background: var(--bg-surface-hover);
    border-color: rgba(var(--brand-primary-rgb), 0.3);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.row-info {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.row-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.row-date {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

.restore-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 5px 12px;
    border-radius: 10px;
    font-size: 0.8rem;
    font-weight: 600;
    color: #3b82f6;
    background: rgba(59, 130, 246, 0.05);
    border: 1.5px solid rgba(59, 130, 246, 0.1);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.restore-btn:hover {
    background: #3b82f6;
    color: white;
    border-color: #3b82f6;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.dark .restore-btn {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.2);
}

.dark .restore-btn:hover {
    background: #3b82f6;
    border-color: #3b82f6;
}

/* --- Utility --- */
.danger-btn-outline {
    width: 100%;
    padding: 0.85rem;
    border: 2px solid #ef4444;
    background: transparent;
    color: #ef4444;
    border-radius: 16px;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.01em;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.danger-btn-outline:hover {
    background: rgba(239, 68, 68, 0.1);
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.2);
    border-color: #f87171;
}

.danger-btn-outline:active {
    background: rgba(239, 68, 68, 0.15);
    transform: scale(0.985);
}

.danger-text {
    display: block;
    width: fit-content;
    background: none;
    border: none;
    color: #ef4444;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    margin-top: 1.5rem;
    border-radius: 8px;
    opacity: 0.6;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.danger-text:hover {
    opacity: 1;
    background: rgba(239, 68, 68, 0.05);
    color: #f87171;
}


.mt-8 {
    margin-top: 2rem;
}

.mt-4 {
    margin-top: 1rem;
}

.mb-4 {
    margin-bottom: 1rem;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Search Modal Centered */
.search-modal-container {
    width: 95%;
    max-width: 600px;
    height: 520px;
    /* ABSOLUTELY FIXED - No jumping ever */
    border-radius: 1.25rem;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 50px 100px -20px rgba(0, 0, 0, 0.15), 0 30px 60px -30px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-medium);
    animation: zoomIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    background: var(--bg-modal);
    backdrop-filter: blur(28px) saturate(180%);
}

.dark .search-modal-container {
    background: rgba(15, 15, 18, 0.98);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 40px 80px -20px rgba(0, 0, 0, 0.8);
}

.search-modal-header {
    height: 72px;
    /* Increased height for better balance */
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(var(--bg-canvas-rgb), 0.6);
    /* More opaque for "fixed" feel */
    border-bottom: 1px solid var(--border-light);
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.search-modal-header:focus-within {
    background: rgba(var(--bg-canvas-rgb), 0.7);
    border-bottom-color: var(--brand-primary);
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    font-size: 1.15rem;
    /* Larger font for readability */
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    letter-spacing: -0.01em;
    padding: 0.5rem 0;
}

.search-input::placeholder {
    color: var(--text-tertiary);
    opacity: 0.7;
}

.dark .search-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.5;
}

.search-shortcut {
    font-size: 0.6rem;
    background: var(--bg-surface-hover);
    color: var(--text-secondary);
    padding: 4px 8px;
    /* Better padding */
    border-radius: 6px;
    font-weight: 800;
    border: 1px solid var(--border-medium);
    opacity: 0.8;
    letter-spacing: 0.05em;
    font-family: 'Inter', sans-serif;
}

.dark .search-shortcut {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    border-color: rgba(255, 255, 255, 0.15);
}

.search-modal-content {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem;
    display: flex;
    /* Centering empty state */
    flex-direction: column;
}

.search-modal-content>div {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.search-group {
    margin-bottom: 1.5rem;
}

.search-group:last-child {
    margin-bottom: 0.5rem;
}

.group-title {
    padding: 0 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.group-items {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 0.75rem 0.875rem;
    border-radius: 0.75rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    width: 100%;
    text-align: left;
    background: transparent;
    border: none;
    cursor: pointer;
}

.search-result-item:hover {
    background: var(--bg-surface-hover);
}

.dark .search-result-item:hover {
    background: rgba(255, 255, 255, 0.06);
}

.search-result-item:hover .item-icon {
    background: var(--bg-canvas);
    color: var(--brand-primary);
}

.item-icon {
    width: 32px;
    height: 32px;
    background: var(--bg-surface-hover);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.dark .item-icon {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
}

.item-title {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: color 0.2s ease;
}

.empty-state {
    flex: 1;
    /* Occupy remaining space */
    padding: 2rem 1rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    /* Center vertically */
    gap: 1.5rem;
    opacity: 0.9;
}

.dark .empty-state {
    color: var(--text-secondary);
    opacity: 0.8;
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes fadeInSlideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

/* Search result snippet & metadata */
.item-title b,
.search-result-item .bg-brand-primary\/20 {
    background: rgba(var(--brand-primary-rgb), 0.15);
    color: var(--brand-primary);
    padding: 1px 4px;
    /* Slightly better surrounding space */
    border-radius: 4px;
    font-weight: 700;
    /* Bolder for visibility */
    box-shadow: 0 0 0 1px rgba(var(--brand-primary-rgb), 0.1);
    /* Subtle outline for depth */
}

.dark .item-title b,
.dark .search-result-item .bg-brand-primary\/20 {
    background: rgba(var(--brand-primary-rgb), 0.25);
    color: #a5b4fc;
    /* Indigo 300 for better pop */
    box-shadow: 0 0 0 1px rgba(var(--brand-primary-rgb), 0.2);
}

.search-result-item p {
    color: var(--text-secondary);
    /* Softer for better hierarchy */
    font-size: 0.825rem;
    line-height: 1.5;
    margin-top: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    /* Increased to 2 lines for better context */
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.dark .search-result-item p {
    color: var(--text-secondary);
    opacity: 0.7;
}

.dark .search-result-item .item-title {
    color: var(--text-primary) !important;
}

.search-result-item .item-date {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-secondary);
    opacity: 0.6;
    letter-spacing: 0.05em;
    transition: opacity 0.2s ease;
}

.search-result-item:hover .item-date {
    opacity: 1;
}

.dark .search-result-item .item-date {
    color: var(--text-secondary);
    opacity: 0.5;
}

.dark .search-result-item:hover .item-date {
    color: var(--text-primary);
    opacity: 0.8;
}

/* Attachment Menu */
.attachment-menu {
    position: absolute;
    bottom: 100%;
    left: 0;
    margin-bottom: 0.5rem;
    background: var(--bg-modal);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-light);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
    min-width: 180px;
    z-index: 100;
    animation: fadeIn 0.15s ease-out;
}

.attachment-menu button {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.75rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-primary);
    border-radius: 0.5rem;
}

.attachment-menu button:hover {
    background: var(--bg-surface-hover);
}

/* Search Modal */
.modal-overlay {
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.search-modal {
    background: var(--bg-canvas);
    border: 1px solid var(--border-light);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    border-radius: 1rem;
}

.search-header {
    border-bottom: 1px solid var(--border-light);
    background: var(--bg-surface);
}

.search-results {
    background: var(--bg-canvas);
}

.search-item {
    color: var(--text-primary);
}

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

/* Scroll to bottom */
.scroll-to-bottom {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 1.5rem;
    /* Lowered, right above input area */
    width: 36px;
    /* Slightly smaller to be less intrusive */
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    z-index: 40;
    background: rgba(var(--bg-surface-rgb, 255, 255, 255), 0.6);
    /* Transparent background */
    backdrop-filter: blur(8px);
    /* Glassmorphism effect */
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.2s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0.7;
    /* Initially semi-transparent */
}

.scroll-to-bottom:hover {
    background: rgba(var(--bg-surface-rgb, 255, 255, 255), 0.8);
    color: var(--brand-primary);
    opacity: 1;
    transform: translateX(-50%) translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Pin Indicator Icon */
.chat-pin-icon {
    display: inline-block;
    vertical-align: middle;
    margin-right: 8px;
    color: #3b82f6;
    flex-shrink: 0;
}

/* Premium Toast Notification */
.premium-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: #ffffff;
    padding: 12px 20px;
    border-radius: 12px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1), 0 5px 15px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    gap: 16px;
    z-index: 9999;
    border: 1px solid rgba(0, 0, 0, 0.05);
    animation: toastSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.dark .premium-toast {
    background: #1e1e1e;
    border-color: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.premium-toast.warning {
    border-left: 4px solid #f59e0b;
}

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

.toast-content strong {
    display: block;
    font-size: 14px;
    margin-bottom: 2px;
}

.toast-content p {
    font-size: 13px;
    margin: 0;
    opacity: 0.8;
}

@keyframes toastSlideUp {
    from {
        opacity: 0;
        transform: translate(-50%, 20px);
    }

    to {
        opacity: 1;
        transform: translate(-50%, 0);
    }
}

/* Premium PDF Export Styling */
.pdf-export-container {
    padding: 60px 50px;
    background: white !important;
    color: #1a1a1a !important;
    font-family: 'Inter', -apple-system, blinkmacsystemfont, 'Segoe UI', roboto, sans-serif;
    line-height: 1.6;
    width: 800px;
    position: fixed;
    left: -2000px;
    top: 0;
    z-index: 9999;
}

/* Force dark text for all elements in PDF regardless of app theme */
.pdf-export-container * {
    color: #1a1a1a !important;
}

.pdf-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-45deg);
    font-size: 120px;
    font-weight: 900;
    color: rgba(0, 0, 0, 0.03) !important;
    /* Extremely subtle */
    pointer-events: none;
    z-index: 0;
    white-space: nowrap;
}

.pdf-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #f0f0f0;
    margin-bottom: 30px;
    padding-bottom: 15px;
}

.pdf-brand {
    font-size: 24px;
    font-weight: 800;
    color: #4f46e5 !important;
    letter-spacing: -0.02em;
}

.pdf-meta {
    text-align: right;
    font-size: 12px;
    color: #666 !important;
}

.pdf-content {
    font-size: 14px;
}

.pdf-content h1,
.pdf-content h2,
.pdf-content h3 {
    color: #111;
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

.pdf-export-container .katex-display {
    background: transparent;
    padding: 10px 0;
    border: none;
    margin: 20px 0;
}

.pdf-footer {
    margin-top: 50px;
    padding-top: 15px;
    border-top: 1px solid #f0f0f0;
    font-size: 10px;
    color: #999 !important;
    text-align: center;
}

/* --- Unsaved Changes Warning --- */
.unsaved-warning-overlay {
    position: absolute;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(12px);
    background: rgba(0, 0, 0, 0.4);
    animation: fadeIn 0.3s ease-out;
    border-radius: 24px;
}

.warning-content {
    background: var(--bg-surface);
    padding: 2.5rem;
    border-radius: 20px;
    width: 90%;
    max-width: 440px;
    text-align: center;
    border: 1px solid var(--border-light);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transform: scale(0.95);
    animation: scaleIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.warning-icon-wrapper {
    width: 60px;
    height: 60px;
    background: rgba(245, 158, 11, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.warning-content h3 {
    font-size: 1.35rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.warning-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 2rem;
}

.warning-actions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.warning-btn {
    padding: 0.75rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.warning-btn.discard {
    background: transparent;
    border-color: var(--border-light);
    color: var(--text-secondary);
}

.warning-btn.discard:hover {
    background: var(--bg-surface-hover);
    color: #ef4444;
}

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

.warning-btn.cancel:hover {
    background: var(--bg-surface-active);
}

.warning-btn.save {
    background: var(--brand-primary);
    color: white;
}

.warning-btn.save:hover {
    filter: brightness(1.1);
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.save-profile-btn.active {
    background: var(--brand-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
}

.save-profile-btn.active:hover {
    filter: brightness(1.1);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes scaleIn {
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* Sidebar Help Section */
.sidebar-help {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    margin: 8px 12px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-secondary);
    border: 1px solid transparent;
}

.sidebar-help:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
    border-color: var(--border-light);
}

.sidebar-help .help-icon {
    flex-shrink: 0;
    transition: transform 0.2s;
}

.sidebar-help:hover .help-icon {
    transform: scale(1.1);
}

.help-text {
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
    opacity: 1;
    transition: opacity 0.3s, visibility 0.3s;
}

.sidebar-collapsed .help-text {
    opacity: 0;
    visibility: hidden;
}

.sidebar-collapsed .sidebar-help {
    justify-content: center;
    padding: 10px 0;
    margin: 8px 4px;
}