:root {
    /* --- Color Variables --- */
    /* Surface Colors */
    --surface-dark: rgba(34, 34, 34, 0.95);
    --surface-light: rgba(255, 255, 255, 0.05);

    /* Action Colors */
    --primary-blue: #ffffff;
    --success-green: #28a745;
    --warning-yellow: #ffc107;
    --danger-red: #ff0800;

    /* Text Colors */
    --text-primary: #e8e8e8;
    --text-secondary: #a0a0a0;

    /* Background Colors */
    --background-overlay: rgba(0, 0, 0, 0.7);

    /* Animation */
    --transition-smooth: 0.4s ease-in-out;
    --animation-spin-duration: 1s;
    --animation-shake-duration: 0.3s;
}

/* --- Loading Components --- */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--background-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.spinner {
    width: 3.125rem; /* 50px */
    height: 3.125rem;
    border: 0.3125rem solid rgba(255, 255, 255, 0.2); /* 5px */
    border-top-color: var(--primary-blue);
    border-radius: 50%;
    animation: spin var(--animation-spin-duration) linear infinite;
}

/* --- Left Sidebar --- */
.left-sidebar {
    width: var(--sidebar-width);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1000;
    background-color: rgba(5, 5, 10, 0.82);
    border-right: 1px solid rgba(255, 255, 255, 0.04);
    transform: translateX(0);
    transition: width var(--transition-speed) ease;
    display: flex;
    flex-direction: column;
    box-shadow: none;
    backdrop-filter: blur(16px);
    overflow: visible;
}

.left-sidebar.closed {
    transform: none;
}

body.sidebar-collapsed .left-sidebar,
body.sidebar-collapsed .left-sidebar .sidebar-content {
    overflow: visible;
}

/* --- Content Wrapper Adjustments --- */
.content-wrapper {
    margin-left: var(--sidebar-width);
    transition: margin var(--transition-speed) ease;
}

.sidebar-header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0.5rem;
    background-color: inherit;
    width: 100%;
    box-shadow: none;
    overflow: visible;
    /* Allow tooltips to overflow outside sidebar */
    clip-path: none;
}

.sidebar-logo-link {
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    border-radius: 50%;
    padding: 0.25rem;
    transition: opacity 0.15s ease;
}

.sidebar-logo-link:hover {
    opacity: 0.8;
}

.sidebar-header img {
    width: 1.85rem; /* 30px */
    height: 1.85rem;
    margin-right: 0.5rem;
    border-radius: 50%;
    object-fit: cover;
}

.sidebar-header h1 {
    font-size: 0.875rem; /* 14px */
    color: var(--primary-blue);
    font-weight: 500;
    font-family: 'Montserrat', sans-serif;
    margin: 0;
    flex-grow: 1;
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-footer {
    position: sticky;
    bottom: 0;
    z-index: 10;
    background: inherit;
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem 1.25rem 1.25rem;
    width: 100%;
    border-top: none;
    box-sizing: border-box;
}

.sidebar-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem; /* 12px 16px */
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.875rem; /* 14px */
    font-weight: 500;
    cursor: pointer;
    border-radius: 0.375rem; /* 6px */
    transition: background-color 0.12s ease-out, color 0.12s ease-out;
}

.sidebar-item:hover,
.sidebar-item.active {
    background-color: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.95);
}

.sidebar-content {
    position: relative;
    flex-grow: 1;
    overflow-y: auto;
    overflow-x: visible;
    padding: 0.5rem 0.5rem 1.5rem 0.5rem; /* reduced side padding */
}

.sidebar-quick-actions {
    position: relative;
    padding: 0.25rem 0;
    margin-bottom: 0.5rem;
    background: transparent;
}

.sidebar-quick-actions-inner {
    display: flex;
    flex-direction: column;
    gap: 0.05rem;
    padding: 0;
    border-radius: 0;
    width: 100%;
    background: transparent;
    border: none;
    box-shadow: none;
}

.sidebar-action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: none;
    border-radius: 0.5rem;
    padding: 0.5rem 0.75rem; /* better left padding for hover pill */
    background: transparent;
    color: var(--text-primary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: none;
    box-shadow: none;
    position: relative;
    width: 100%;
    overflow: visible;
}

.sidebar-action-btn,
.sidebar-action-btn *,
.sidebar-action-btn::before,
.sidebar-action-btn::after {
    transition: none !important;
    animation: none !important;
    transform: none !important;
}

.sidebar-action-btn::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: transparent;
    border: none;
    transition: background-color 0.15s ease-out;
    pointer-events: none;
    z-index: -1;
}

.sidebar-action-icon {
    width: 1.3rem;
    height: 1.3rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
}


.sidebar-action-icon svg {
    width: 100%;
    height: 100%;
    stroke: currentColor;
}

.sidebar-action-btn.active {
    color: #fff;
}

.sidebar-action-btn:hover {
    color: var(--text-primary);
    box-shadow: none;
}

.sidebar-action-btn:hover::before {
    background: rgba(255, 255, 255, 0.08);
}

.history-search-modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1600;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.history-search-modal.open {
    opacity: 1;
    pointer-events: auto;
}

.history-search-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(8, 8, 8, 0.8);
    backdrop-filter: blur(0.35rem);
}

.history-search-dialog {
    position: relative;
    width: min(32rem, 92vw);
    max-height: min(80vh, 36rem);
    background: rgba(18, 18, 18, 0.95);
    border: 0.0625rem solid rgba(255, 255, 255, 0.08);
    border-radius: 1rem;
    box-shadow: 0 2rem 3.5rem rgba(0, 0, 0, 0.7);
    padding: 1rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 1;
}

.history-search-header {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.history-search-input {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    border: 0.0625rem solid rgba(255, 255, 255, 0.08);
}

.history-search-icon {
    color: rgba(255, 255, 255, 0.5);
    width: 1.25rem;
    height: 1.25rem;
    display: inline-flex;
}

.history-search-icon svg {
    width: 100%;
    height: 100%;
    stroke: currentColor;
}

.history-search-input input {
    flex: 1;
    border: none;
    background: transparent;
    color: #fff;
    font-size: 0.95rem;
    outline: none;
}

.history-search-close {
    border: none;
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.7);
    border-radius: 0.35rem;
    padding: 0.25rem 0.5rem;
    cursor: pointer;
    font-size: 0.8rem;
}

.history-search-close:hover {
    background: rgba(255, 255, 255, 0.16);
    color: #fff;
}

.history-search-hint {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.45);
    margin: 0;
}

.history-search-results {
    flex: 1;
    overflow-y: auto;
    padding-right: 0.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.history-search-results::-webkit-scrollbar {
    width: 0.4rem;
}

.history-search-results::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.12);
    border-radius: 1rem;
}

.history-search-result {
    width: 100%;
    text-align: left;
    border: 0.0625rem solid rgba(255, 255, 255, 0.06);
    border-radius: 0.75rem;
    background: rgba(255, 255, 255, 0.02);
    padding: 0.75rem;
    color: inherit;
    cursor: pointer;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.history-search-result:hover {
    border-color: rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.04);
}

.history-result-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.75);
}

.history-result-name {
    font-weight: 500;
    font-size: 0.83rem;
    color: #fff;
    margin-right: 0.5rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-result-time {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.45);
}

.history-result-snippet {
    margin: 0.4rem 0 0;
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.7);
}

.history-search-empty {
    padding: 2rem 0.5rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

body.history-search-open {
    overflow: hidden;
}

.images-gallery-modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1600;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.images-gallery-modal.open {
    opacity: 1;
    pointer-events: auto;
}

.images-gallery-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(6, 6, 6, 0.85);
    backdrop-filter: blur(0.35rem);
}

.images-gallery-dialog {
    position: relative;
    width: min(64rem, 96vw);
    max-height: min(90vh, 48rem);
    padding: 1.5rem;
    background: rgba(14, 14, 14, 0.95);
    border-radius: 1.25rem;
    border: 0.0625rem solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 2.5rem 3.5rem rgba(0, 0, 0, 0.7);
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.images-gallery-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.images-gallery-eyebrow {
    margin: 0;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(255, 255, 255, 0.55);
}

.images-gallery-header h2 {
    margin: 0.15rem 0 0;
    font-size: 1.5rem;
    color: #fff;
}

.images-close-btn {
    border: none;
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.7);
    border-radius: 0.5rem;
    padding: 0.4rem 0.75rem;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
}

.images-close-btn:hover {
    background: rgba(255, 255, 255, 0.16);
    color: #fff;
}

.images-gallery-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem 1rem;
    border-radius: 0.85rem;
    background: linear-gradient(135deg, rgba(68, 68, 68, 0.35), rgba(18, 18, 18, 0.5));
    border: 0.0625rem solid rgba(255, 255, 255, 0.08);
}

.images-cta-title {
    margin: 0;
    font-weight: 600;
    color: #fff;
}

.images-cta-desc {
    margin: 0.2rem 0 0;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
}

.images-primary-btn {
    border: none;
    background: linear-gradient(135deg, #6b8cff, #6effd8);
    color: #111;
    border-radius: 0.8rem;
    padding: 0.55rem 1.25rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
}

.images-primary-btn i {
    font-size: 0.9rem;
}

.images-gallery-body {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    padding-right: 0.3rem;
}

.images-gallery-body::-webkit-scrollbar {
    width: 0.45rem;
}

.images-gallery-body::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.2), rgba(120, 120, 120, 0.15));
    border-radius: 1rem;
}

.images-gallery-body::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.04);
    border-radius: 1rem;
}

.images-gallery-composer {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.03);
    border: 0.0625rem solid rgba(255, 255, 255, 0.08);
    border-radius: 0.9rem;
    padding: 0.85rem;
}

.images-composer-field textarea {
    width: 100%;
    border: none;
    background: transparent;
    color: #fff;
    font-size: 0.9rem;
    resize: none;
    line-height: 1.5;
}

.images-composer-field textarea:focus {
    outline: none;
}

.images-composer-actions {
    display: flex;
    justify-content: flex-end;
}

.images-insert-btn {
    border: none;
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    border-radius: 0.65rem;
    padding: 0.35rem 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    font-size: 0.85rem;
}

.images-insert-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.images-composer-field textarea.input-error {
    animation: inputPulse 0.4s ease;
}

@keyframes inputPulse {
    0% { box-shadow: 0 0 0 rgba(255, 0, 0, 0); }
    50% { box-shadow: 0 0 0.75rem rgba(255, 0, 0, 0.35); }
    100% { box-shadow: 0 0 0 rgba(255, 0, 0, 0); }
}

.images-gallery-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(6rem, 1fr));
    gap: 0.5rem;
}

@media (min-width: 1100px) {
    .images-gallery-grid {
        grid-template-columns: repeat(5, minmax(0, 1fr));
    }
}

.images-gallery-grid::-webkit-scrollbar {
    width: 0.45rem;
}

.images-gallery-grid::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 0.75rem;
}

.images-gallery-card {
    background: rgba(255, 255, 255, 0.03);
    border: 0.0625rem solid rgba(255, 255, 255, 0.06);
    border-radius: 0.6rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 0.35rem 0.7rem rgba(0, 0, 0, 0.35);
}

.images-card-preview {
    position: relative;
    display: block;
    aspect-ratio: 1 / 1;
    background: rgba(0, 0, 0, 0.4);
    border: none;
    padding: 0;
    width: 100%;
    cursor: pointer;
}

.images-card-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 0.25rem;
}

.images-card-meta {
    padding: 0.55rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.images-card-prompt {
    margin: 0;
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.85);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.images-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.5);
}

.images-card-tag {
    padding: 0.1rem 0.5rem;
    border-radius: 1rem;
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.75);
}

.images-gallery-empty {
    margin-top: 2rem;
    padding: 2rem 1rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.55);
    border: 0.0625rem dashed rgba(255, 255, 255, 0.2);
    border-radius: 1rem;
    display: none;
    justify-content: center;
}

.images-preview-modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.images-preview-modal.open {
    opacity: 1;
    pointer-events: auto;
}

.images-preview-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(0.4rem);
}

.images-preview-dialog {
    position: relative;
    width: min(38rem, 92vw);
    border-radius: 1.1rem;
    border: 0.0625rem solid rgba(255, 255, 255, 0.08);
    background: rgba(18, 18, 18, 0.95);
    box-shadow: 0 2rem 3rem rgba(0, 0, 0, 0.7);
    padding: 1.25rem;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.images-preview-dialog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.images-preview-eyebrow {
    margin: 0;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.6);
}

.images-preview-dialog-header h3 {
    margin: 0.15rem 0 0;
    color: #fff;
    font-size: 1.25rem;
}

.images-preview-dialog-actions {
    display: flex;
    align-items: center;
    gap: 0.45rem;
}

.images-preview-link {
    padding: 0.35rem 0.85rem;
    border-radius: 0.6rem;
    border: 0.0625rem solid rgba(255, 255, 255, 0.3);
    color: #fff;
    font-size: 0.85rem;
}

.images-preview-close {
    border: none;
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border-radius: 0.55rem;
    padding: 0.35rem 0.6rem;
    cursor: pointer;
}

.images-preview-canvas {
    border-radius: 0.9rem;
    background: rgba(0, 0, 0, 0.5);
    padding: 0.75rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.images-preview-canvas img {
    max-width: 100%;
    max-height: 70vh;
    border-radius: 0.5rem;
}

.images-preview-meta {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.images-preview-prompt {
    margin: 0;
    font-size: 0.95rem;
    color: #fff;
}

.images-preview-details {
    margin: 0;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.65);
}

body.images-modal-open,
body.image-preview-open {
    overflow: hidden;
}

/* --- Scrollbar for Sidebar Content Only --- */
.sidebar-content::-webkit-scrollbar {
    width: 0.625rem; /* 10px */
}

.sidebar-content::-webkit-scrollbar-thumb {
    background-color: #4d4d4d;
    border-radius: 0.375rem; /* 6px */
    border: 0.125rem solid #0e0e0e; /* 2px */
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.sidebar-content:hover::-webkit-scrollbar-thumb {
    background-color: #777;
}

.sidebar-content::-webkit-scrollbar-track {
    background-color: #1a1a1a;
    border-radius: 0.375rem; /* 6px */
}

.sidebar-content::-webkit-scrollbar-button {
    display: none;
}

body.sidebar-collapsed .sidebar-content {
    scrollbar-width: none;
    padding: 0.35rem 0.25rem 0.4rem 0.25rem;
}

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

body.sidebar-collapsed .sidebar-quick-actions {
    padding: 0.2rem 0;
    margin-bottom: 0.35rem;
    display: flex;
    justify-content: center;
}

body.sidebar-collapsed .sidebar-quick-actions-inner {
    align-items: center;
}

body.sidebar-collapsed .left-sidebar .sidebar-action-btn {
    width: auto;
    padding: 0.4rem 0;
}

body.sidebar-collapsed .left-sidebar .sidebar-action-btn::before {
    inset: 0;
    border-radius: 50%;
}

/* --- Sidebar Item Hover Animations --- */
.sidebar-item:hover i {
    color: var(--primary-blue);
}

/* --- New Chat Button --- */
.sidebar-toggle-button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    overflow: visible;
    transition: background-color 0.15s ease;
    flex-shrink: 0;
    position: relative;
}

.sidebar-toggle-button,
.sidebar-toggle-button *,
.sidebar-toggle-button::before,
.sidebar-toggle-button::after {
    transition: none !important;
    animation: none !important;
    transform: none !important;
}

.sidebar-toggle-button:hover,
.sidebar-toggle-button:focus {
    background-color: rgba(255, 255, 255, 0.08);
    box-shadow: none;
}

.sidebar-toggle-button svg {
    width: 1.25rem;
    height: 1.25rem;
    min-width: 1.25rem;
    min-height: 1.25rem;
    flex-shrink: 0;
}

.sidebar-toggle-button::after {
    content: attr(data-tooltip);
    position: absolute;
    top: 50%;
    left: calc(100% + 0.75rem); /* Position to the right of button */
    transform: translateY(-50%);
    background: rgba(20, 20, 20, 0.95);
    color: #fff;
    padding: 0.4rem 0.7rem;
    border-radius: 0.4rem;
    font-size: 0.75rem;
    letter-spacing: 0.01em;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
    z-index: 9999; /* High z-index to appear over everything */
}

.sidebar-toggle-button:focus-visible::after,
.sidebar-toggle-button:hover::after {
    opacity: 1;
}

body.sidebar-collapsed .left-sidebar .sidebar-header {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 0.25rem;
}

body.sidebar-collapsed .left-sidebar .sidebar-header img {
    margin-right: 0;
}

body.sidebar-collapsed .left-sidebar .sidebar-toggle-button {
    width: 2.5rem;
    height: 2.5rem;
}

body.sidebar-collapsed .left-sidebar .sidebar-toggle-button::after {
    top: 50%;
    left: calc(100% + 0.75rem);
    transform: translateY(-50%);
}

/* --- Chat Tab Components --- */
.chat-tab {
    position: relative;
    padding: 0.5rem 2.75rem 0.5rem 0.75rem; /* better left padding for hover pill */
    border: none;
    border-radius: 0.5rem;
    margin-bottom: 0.125rem;
    cursor: pointer;
    background: transparent;
    transition: none;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    overflow: visible;
}

.chat-tab::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: transparent;
    border: none;
    transition: background-color 0.15s ease-out;
    pointer-events: none;
    z-index: -1;
}

.tab-name-row {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
}

.chat-tab:hover::before {
    background: rgba(255, 255, 255, 0.08);
}

.load-more-button {
    display: block;
    width: 100%;
    padding: 0.5rem; /* 8px */
    background-color: transparent;
    color: var(--primary-blue);
    border: 0.0625rem solid rgba(255, 255, 255, 0.2); /* 1px */
    border-radius: 0.25rem; /* 4px */
    cursor: pointer;
    text-align: center;
    transition: all 0.2s ease;
    font-size: 0.8125rem; /* 13px */
    line-height: 1.4;
    font-weight: 400;
    min-height: 2rem; /* 32px */
}

.load-more-button:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--primary-blue);
    border-color: rgba(255, 255, 255, 0.25);
}

/* --- Active Tab State --- */
.chat-tab.active-tab {
    z-index: 1;
}

.chat-tab.active-tab::before {
    background: rgba(255, 255, 255, 0.1);
}

.tab-content {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    width: 100%;
    min-height: 1.5rem;
    justify-content: flex-start;
}

.tab-name-container {
    position: relative;
    flex: 1;
    min-width: 0;
    max-width: 100%;
    border-radius: 0.375rem; /* 6px */
    background: transparent;
    padding: 0.25rem 0; /* 4px 0 */
}

.tab-name {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-weight: 400;
    font-size: 0.82rem; /* 13px */
    line-height: 1.35;
    color: rgba(255, 255, 255, 0.9);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    width: 100%;
    max-width: none;
    flex: 1 1 auto;
    min-width: 0;
    text-align: left;
}

.chat-tab.active-tab .tab-name {
    position: relative;
    animation: typeTitle 1.2s steps(18, end) 1;
}

@keyframes typeTitle {
    from { width: 0; }
    to { width: 100%; }
}

.title-fade {
    animation: titleFade 0.6s ease;
}

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

/* --- Section Headers --- */
.section-header {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-weight: 500;
    font-size: 0.75rem; /* 12px */
    line-height: 1.2;
    color: rgba(255, 255, 255, 0.5);
    padding: 0.2rem 0.75rem; /* 3px 12px */
    margin-top: 0.5rem; /* 8px */
    margin-bottom: 0.25rem; /* 4px */
    list-style-type: none;
    text-transform: capitalize;
    letter-spacing: 0.05rem;
}

ul {
    list-style-type: none;
    padding-left: 0;
}

.sidebar-empty-state {
    color: rgba(255, 255, 255, 0.45);
    font-size: 0.85rem;
    padding: 0.75rem 0.75rem 2rem;
}

/* --- Button Group --- */
.tab-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    position: absolute;
    top: 50%;
    right: 0.35rem;
    transform: translateY(-50%);
    gap: 0.25rem;
    width: auto;
    min-width: 0;
    margin: 0;
}

.tab-actions-hidden {
    opacity: 0;
    pointer-events: none;
}

.tab-actions-toggle {
    width: 1.35rem;
    height: 1.35rem;
    border-radius: 999px;
    border: none;
    background: transparent;
    color: rgba(255, 255, 255, 0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.tab-actions-toggle i {
    font-size: 0.8rem;
}

.tab-actions-toggle .tab-pin-icon,
.tab-actions-toggle .tab-ellipsis-icon {
    display: inline-flex;
}

.tab-actions-toggle .tab-pin-icon {
    display: none;
}

.tab-actions-toggle.pinned-toggle .tab-pin-icon {
    display: inline-flex;
}

.tab-actions-toggle.pinned-toggle .tab-ellipsis-icon {
    display: none;
}

.chat-tab:hover .tab-actions-toggle.pinned-toggle .tab-pin-icon,
.chat-tab.tab-menu-open .tab-actions-toggle.pinned-toggle .tab-pin-icon {
    display: none;
}

.chat-tab:hover .tab-actions-toggle.pinned-toggle .tab-ellipsis-icon,
.chat-tab.tab-menu-open .tab-actions-toggle.pinned-toggle .tab-ellipsis-icon {
    display: inline-flex;
}

.chat-tab:hover .tab-actions-toggle,
.chat-tab.tab-menu-open .tab-actions-toggle {
    opacity: 1;
}

.pinned-tab .tab-actions-toggle {
    opacity: 1;
}

.tab-actions-toggle:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
}

.tab-actions-toggle:focus-visible {
    outline: 0.125rem solid rgba(255, 255, 255, 0.45);
    outline-offset: 0.125rem;
}

.button-group {
    position: fixed;
    top: -999px;
    left: -999px;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    padding: 0.4rem;
    border-radius: 0.85rem;
    border: 0.0625rem solid rgba(255, 255, 255, 0.12);
    background: rgba(18, 18, 18, 0.98);
    box-shadow: 0 0.8rem 2rem rgba(0, 0, 0, 0.45);
    min-width: 9rem;
    opacity: 0;
    pointer-events: none;
    transform: translate(-0.2rem, 0) scale(0.96);
    transform-origin: top left;
    transition: opacity var(--transition-smooth), transform var(--transition-smooth);
    z-index: 1200;
}

.button-group.button-group-visible {
    opacity: 1;
    transform: translate(0, 0) scale(1);
    pointer-events: auto;
}

/* --- Button Styles --- */
.chat-btn {
    padding: 0.35rem 0.55rem;
    border: none;
    border-radius: 0.55rem;
    cursor: pointer;
    background: transparent;
    color: var(--text-secondary);
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    justify-content: flex-start;
    width: 100%;
    font-size: 0.82rem;
    font-weight: 500;
}

.chat-btn i {
    font-size: 0.9rem;
}

.chat-btn:hover {
    transform: translateX(0.1rem);
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
}

.share-btn:hover { color: var(--primary-blue); }
.pin-btn:hover { color: var(--primary-blue); }
.archive-btn:hover { color: var(--success-green); }
.rename-btn:hover { color: var(--warning-yellow); }
.delete-btn:hover { 
    color: var(--danger-red);
    animation: shake var(--animation-shake-duration) cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

/* --- Rename Input --- */
.rename-input {
    width: 100%;
    font-size: inherit;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--surface-dark);
    border: 0.0625rem solid rgba(255, 255, 255, 0); /* 1px */
    border-radius: 0.5rem; /* 8px */
    padding: 0.375rem; /* 6px */
    transition: all var(--transition-smooth);
    box-shadow: 0 0.125rem 0.5rem rgba(0, 0, 0, 0.25); /* 2px 8px */
}

.rename-input:focus {
    border-color: #343434;
    background-color: rgba(255, 255, 255, 0.276);
    box-shadow: 0 0 0.9375rem rgba(0, 0, 0, 0.4); /* 0 0 15px */
}

/* --- Toast Notifications --- */
.toast {
    position: fixed;
    bottom: 8rem; /* 100px */
    left: 60%;
    transform: translateX(-50%);
    width: calc(100% - 1.25rem); /* 100% - 20px */
    max-width: 37.5rem; /* 600px */
    padding: 0.75rem 1.25rem; /* 12px 20px */
    border-radius: 0.9375rem; /* 15px */
    font-size: 0.8rem;
    color: #ffffff;
    z-index: 4000;
    opacity: 0.85;
    box-shadow: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.15); /* 4px 12px */
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
}

.toast.success { 
    background: linear-gradient(135deg, #6c6c6c, #393939);
}

.toast.error { 
    background: linear-gradient(135deg, #d9534f, #c9302c);
}

/* --- Animations --- */
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes shake {
    0% { transform: translateX(0); }
    25% { transform: translateX(-0.25rem); } /* -4px */
    50% { transform: translateX(0.25rem); } /* 4px */
    75% { transform: translateX(-0.25rem); } /* -4px */
    100% { transform: translateX(0); }
}

@keyframes toastSlide {
    0% { transform: translateY(1.875rem) scale(0.95); opacity: 0; } /* 30px */
    40% { transform: translateY(-0.5rem) scale(1.05); opacity: 1; } /* -8px */
    80% { transform: translateY(0.25rem) scale(1); opacity: 1; } /* 4px */
    100% { transform: translateY(0) scale(1); opacity: 1; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-0.625rem); /* -10px */
        animation-timing-function: cubic-bezier(0.34, 1.56, 0.64, 1); }
}

/* --- Keyboard Shortcut Hints --- */
.shortcut-hint {
    margin-left: auto;
    font-size: 0.7rem;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: rgba(255, 255, 255, 0.35);
    letter-spacing: 0.02em;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
    white-space: nowrap;
}

.sidebar-action-btn.has-shortcut:hover .shortcut-hint {
    opacity: 1;
}

/* Hide shortcut hints when sidebar is collapsed */
body.sidebar-collapsed .shortcut-hint {
    display: none;
}

/* Shortcut hint on mobile - hide completely */
@media (max-width: 768px) {
    .shortcut-hint {
        display: none !important;
    }
}