:root {
      color-scheme: light;
      --bg: #ffffff;
      --surface: #f7f7f8;
      --surface-strong: #ececf1;
      --surface-hover: #e8e8ec;
      --border: #dedee3;
      --border-soft: #ececf1;
      --text: #202123;
      --muted: #6e6e80;
      --muted-strong: #565869;
      --accent: #10a37f;
      --accent-dark: #0d8f70;
      --danger: #b42318;
      --code-bg: #0f172a;
      --code-text: #e5e7eb;
      --mark: #fff3a3;
      --header-bg: rgba(255, 255, 255, 0.94);
      --topbar-bg: rgba(255, 255, 255, 0.92);
      --modal-overlay: rgba(255, 255, 255, 0.46);
      --dialog-bg: #ffffff;
      --dialog-action-bg: #f7f7f8;
      --image-bg: #ffffff;
      --link: #0b57d0;
      --sidebar-width: 260px;
      --source-panel-width: 360px;
      --content-width: 816px;
      --user-bubble: #f4f4f4;
      --radius: 8px;
      --shadow: 0 16px 48px rgba(0, 0, 0, 0.16);
    }

    :root[data-theme="dark"] {
      color-scheme: dark;
      --bg: #151515;
      --surface: #202123;
      --surface-strong: #2a2b2f;
      --surface-hover: #343541;
      --border: #3f4048;
      --border-soft: #303139;
      --text: #ececf1;
      --muted: #acacbe;
      --muted-strong: #d1d5db;
      --accent: #10a37f;
      --accent-dark: #1a7f64;
      --danger: #f87171;
      --code-bg: #0b1020;
      --code-text: #e5e7eb;
      --mark: #5f4b12;
      --header-bg: rgba(21, 21, 21, 0.94);
      --topbar-bg: rgba(21, 21, 21, 0.92);
      --modal-overlay: rgba(0, 0, 0, 0.58);
      --dialog-bg: #202123;
      --dialog-action-bg: #1b1c1f;
      --image-bg: #111113;
      --link: #8ab4f8;
      --user-bubble: #2f3037;
      --shadow: 0 16px 48px rgba(0, 0, 0, 0.42);
    }

    * {
      box-sizing: border-box;
    }

    html,
    body {
      height: 100%;
      margin: 0;
    }

    body {
      background: var(--bg);
      color: var(--text);
      font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      font-size: 14px;
      line-height: 1.5;
      overflow: hidden;
    }

    button,
    input {
      font: inherit;
    }

    button {
      border: 0;
    }

    button:focus-visible,
    input:focus-visible {
      outline: 2px solid rgba(16, 163, 127, 0.32);
      outline-offset: 2px;
    }

    .app {
      display: grid;
      grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
      height: 100%;
      min-height: 0;
      transition: grid-template-columns 180ms ease;
    }

    .app.sidebar-collapsed {
      grid-template-columns: 56px minmax(0, 1fr);
    }

    .sidebar {
      position: relative;
      z-index: 12;
      display: block;
      min-width: 0;
      min-height: 0;
      overflow: hidden;
      background: var(--surface);
      border-right: 1px solid var(--border-soft);
      transition: opacity 160ms ease, transform 180ms ease;
    }

    .app.sidebar-collapsed .sidebar {
      opacity: 1;
      overflow: visible;
      pointer-events: auto;
      transform: none;
    }

    .sidebar-panel {
      display: flex;
      flex-direction: column;
      height: 100%;
      min-height: 0;
      overflow: hidden;
    }

    .sidebar-scroll {
      flex: 1 1 auto;
      min-height: 0;
      overflow-y: auto;
      scrollbar-color: #c7c7cf var(--surface);
      scrollbar-width: auto;
    }

    .sidebar-scroll::-webkit-scrollbar {
      width: 16px;
    }

    .sidebar-scroll::-webkit-scrollbar-track {
      background: var(--surface);
    }

    .sidebar-scroll::-webkit-scrollbar-thumb {
      border: 2px solid var(--surface);
      border-radius: 999px;
      background: #c7c7cf;
    }

    .sidebar-scroll::-webkit-scrollbar-thumb:hover {
      background: #a9a9b3;
    }

    .sidebar-scroll::-webkit-scrollbar-corner {
      background: var(--surface);
    }

    .sidebar-rail {
      display: none;
      flex-direction: column;
      align-items: center;
      gap: 10px;
      height: 100%;
      padding: 10px 8px;
    }

    .app.sidebar-collapsed .sidebar-panel {
      display: none;
    }

    .app.sidebar-collapsed .sidebar-rail {
      display: flex;
    }

    .rail-spacer {
      flex: 1 1 auto;
    }

    .brand {
      position: sticky;
      top: 0;
      z-index: 5;
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 10px 10px 10px 14px;
      min-height: 54px;
      background: var(--surface);
    }

    .brand-mark {
      flex: 0 0 auto;
      width: 24px;
      height: 24px;
      background: var(--text);
      -webkit-mask: url("../openai.svg") center / contain no-repeat;
      mask: url("../openai.svg") center / contain no-repeat;
    }

    :root[data-theme="dark"] .brand-mark {
      background: #fff;
    }

    .brand-title {
      flex: 1 1 auto;
      min-width: 0;
      font-size: 20px;
      font-weight: 700;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .sidebar-collapse-button,
    .rail-button {
      position: relative;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      border-radius: 8px;
      color: var(--muted-strong);
      background: transparent;
      cursor: pointer;
    }

    .rail-button::after {
      content: attr(data-tooltip);
      position: absolute;
      left: calc(100% + 10px);
      top: 50%;
      z-index: 50;
      transform: translateY(-50%) translateX(-4px);
      max-width: 180px;
      padding: 6px 9px;
      border-radius: 7px;
      color: #fff;
      background: rgba(17, 17, 17, 0.96);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
      font-size: 12px;
      line-height: 1;
      white-space: nowrap;
      opacity: 0;
      pointer-events: none;
      transition: opacity 120ms ease, transform 120ms ease;
    }

    .rail-button:hover::after,
    .rail-button:focus-visible::after {
      opacity: 1;
      transform: translateY(-50%) translateX(0);
    }

    .sidebar-collapse-button:hover,
    .rail-button:hover {
      background: var(--surface-strong);
    }

    .sidebar-collapse-button svg,
    .rail-button svg,
    .sidebar-action svg {
      width: 20px;
      height: 20px;
      stroke: currentColor;
    }

    .rail-button svg.library-icon,
    .sidebar-action svg.library-icon {
      stroke: none;
      opacity: 0.86;
    }

    .sidebar-actions {
      position: sticky;
      top: 54px;
      z-index: 5;
      display: grid;
      gap: 2px;
      padding: 0 8px 12px;
      background: var(--surface);
      border-bottom: 1px solid transparent;
      transition: border-color 120ms ease, box-shadow 120ms ease;
    }

    .sidebar-panel.scrolled .sidebar-actions {
      border-bottom-color: var(--border-soft);
      box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
    }

    .sidebar-footer {
      flex: 0 0 auto;
      padding: 8px;
      background: var(--surface);
      border-top: 1px solid var(--border-soft);
    }

    .settings-action {
      width: 100%;
    }

    .sidebar-action {
      display: flex;
      align-items: center;
      gap: 10px;
      width: 100%;
      min-height: 36px;
      padding: 8px 10px;
      border-radius: 10px;
      color: var(--text);
      background: transparent;
      cursor: pointer;
      text-align: left;
    }

    .sidebar-action:hover {
      background: var(--surface-strong);
    }

    .sidebar-action.active {
      background: var(--surface-strong);
      font-weight: 650;
    }

    .sidebar-action span {
      min-width: 0;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      font-weight: 500;
    }

    .rail-spacer {
      height: 2px;
    }

    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 7px;
      min-height: 36px;
      padding: 8px 12px;
      border-radius: 10px;
      color: var(--text);
      background: var(--surface-strong);
      cursor: pointer;
      user-select: none;
      transition: background 120ms ease, color 120ms ease, opacity 120ms ease;
    }

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

    .button.primary {
      color: #fff;
      background: #111;
      font-weight: 650;
    }

    .button.primary:hover {
      background: #333;
    }

    .dialog-content {
      padding: 16px;
    }

    .dialog-actions {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 8px;
      min-height: 58px;
      padding: 12px 16px;
      border-top: 1px solid var(--border-soft);
      background: var(--dialog-action-bg);
    }

    .dialog-button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 52px;
      min-height: 36px;
      padding: 7px 15px;
      border: 1px solid transparent;
      border-radius: 999px;
      cursor: pointer;
      font-weight: 650;
      line-height: 1.2;
      transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
    }

    .dialog-button.secondary {
      color: var(--text);
      background: var(--dialog-bg);
      border-color: var(--border);
    }

    .dialog-button.secondary:hover {
      background: var(--surface);
    }

    .dialog-button.primary {
      color: #fff;
      background: #111;
    }

    :root[data-theme="dark"] .dialog-button.primary {
      color: #111;
      background: #fff;
    }

    .dialog-button.primary:hover {
      background: #2f2f2f;
    }

    :root[data-theme="dark"] .dialog-button.primary:hover {
      background: #e5e5e5;
    }

    .dialog-button.primary.danger {
      color: #fff;
      background: #d92d20;
    }

    .dialog-button.primary.danger:hover {
      background: #b42318;
    }

    :root[data-theme="dark"] .dialog-button.primary.danger {
      color: #fff;
      background: #ff453a;
    }

    .button.icon {
      width: 36px;
      padding: 0;
      font-size: 18px;
      line-height: 1;
    }

    .mobile-pdf-button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      padding: 0;
      border-radius: 8px;
      color: var(--muted-strong);
      background: transparent;
      line-height: 1;
      cursor: pointer;
    }

    .mobile-pdf-button:hover {
      background: var(--surface-strong);
    }

    .mobile-pdf-button svg {
      width: 20px;
      height: 20px;
      stroke: currentColor;
    }

    .button:disabled {
      cursor: default;
      opacity: 0.52;
    }

    .meta-panel {
      display: none;
      gap: 8px;
      padding: 0 12px 12px;
    }

    .meta-panel.visible {
      display: grid;
    }

    .meta-line {
      color: var(--muted);
      font-size: 12px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .meta-line strong {
      color: var(--muted-strong);
      font-weight: 650;
    }

    .conversation-list {
      flex: 0 0 auto;
      min-height: auto;
      overflow: visible;
      padding: 0 8px 12px;
    }

    .group {
      margin: 8px 0 12px;
    }

    .group-title {
      position: sticky;
      top: 0;
      z-index: 1;
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 8px 8px 6px;
      color: var(--muted);
      background: var(--surface);
      font-size: 12px;
      font-weight: 700;
    }

    .group-title-text {
      flex: 1 1 auto;
      min-width: 0;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .conversation-sort-button {
      flex: 0 0 auto;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 24px;
      height: 24px;
      padding: 0;
      border-radius: 6px;
      color: var(--muted-strong);
      background: transparent;
      cursor: pointer;
    }

    .conversation-sort-button:hover {
      background: var(--surface-strong);
      color: var(--text);
    }

    .conversation-sort-button svg {
      width: 16px;
      height: 16px;
      stroke: currentColor;
    }

    .conversation-item {
      display: grid;
      gap: 3px;
      width: 100%;
      min-height: 46px;
      margin: 1px 0;
      padding: 9px 10px;
      border-radius: 10px;
      text-align: left;
      color: var(--text);
      background: transparent;
      cursor: pointer;
    }

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

    .conversation-item.active {
      background: var(--surface-strong);
    }

    .conversation-title {
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
      font-size: 14px;
    }

    .conversation-subtitle {
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
      color: var(--muted);
      font-size: 12px;
      font-variant-numeric: tabular-nums;
    }

    .empty-list {
      margin: 16px 8px;
      color: var(--muted);
      font-size: 13px;
    }

    .main {
      position: relative;
      display: grid;
      grid-template-columns: minmax(0, 1fr) 0;
      min-width: 0;
      min-height: 0;
      background: var(--bg);
      transition: grid-template-columns 190ms ease;
    }

    .main.sources-open {
      grid-template-columns: minmax(0, 1fr) var(--source-panel-width);
    }

    .main-scroll {
      position: relative;
      width: 100%;
      min-width: 0;
      min-height: 0;
      overflow: auto;
      scrollbar-gutter: stable;
    }

    .mobile-topbar {
      display: none;
      position: sticky;
      top: 0;
      z-index: 8;
      grid-template-columns: 36px minmax(0, 1fr) auto;
      align-items: center;
      gap: 10px;
      height: 48px;
      min-height: 48px;
      flex: 0 0 48px;
      padding: 8px 12px;
      background: var(--topbar-bg);
      border-bottom: 1px solid var(--border-soft);
      backdrop-filter: blur(10px);
      transform: translateZ(0);
    }

    .mobile-title {
      min-width: 0;
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
      font-weight: 650;
    }

    .empty-state {
      display: grid;
      place-items: center;
      min-height: 100%;
      padding: 32px;
    }

    .drop-zone {
      display: grid;
      place-items: center;
      gap: 14px;
      width: min(560px, 100%);
      min-height: 260px;
      padding: 28px;
      border: 1px dashed var(--border);
      border-radius: var(--radius);
      background: var(--bg);
      text-align: center;
      transition: border-color 120ms ease, background 120ms ease;
    }

    .drop-zone.dragging {
      border-color: var(--accent);
      background: var(--surface);
    }

    .drop-title {
      margin: 0;
      font-size: clamp(22px, 4vw, 30px);
      font-weight: 650;
      letter-spacing: 0;
    }

    .drop-copy {
      max-width: 420px;
      margin: 0;
      color: var(--muted);
    }

    .reader {
      display: none;
      min-height: 100%;
    }

    .reader.visible {
      display: block;
    }

    .thread-header {
      position: sticky;
      top: 0;
      z-index: 5;
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: 16px;
      padding: 18px max(144px, calc((100% - var(--content-width)) / 2 + 120px)) 12px max(24px, calc((100% - var(--content-width)) / 2));
      background: var(--header-bg);
      border-bottom: 1px solid var(--border-soft);
      backdrop-filter: blur(10px);
    }

    .thread-title-group {
      min-width: 0;
      flex: 1 1 auto;
    }

    .thread-title {
      min-width: 0;
      margin: 0;
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
      font-size: 18px;
      font-weight: 700;
      text-align: center;
    }

    .thread-pdf-button {
      flex: 0 0 auto;
      display: none;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      padding: 0;
      border-radius: 8px;
      color: var(--muted-strong);
      background: transparent;
      cursor: pointer;
    }

    .thread-pdf-button:hover {
      background: var(--surface-strong);
    }

    .thread-pdf-button svg {
      width: 20px;
      height: 20px;
      stroke: currentColor;
    }

    .reader.visible .thread-pdf-button {
      display: inline-flex;
      position: absolute;
      top: 14px;
      right: 24px;
    }

    .thread-meta {
      display: none;
    }

    .messages {
      display: grid;
      gap: 0;
      padding: 14px 0 80px;
    }

    .message {
      width: 100%;
      border-bottom: 1px solid transparent;
    }

    .message-inner {
      display: block;
      width: min(var(--content-width), 100%);
      margin: 0 auto;
      padding: 15px 24px;
    }

    .turn-jump {
      position: fixed;
      top: 50%;
      right: 18px;
      z-index: 6;
      --turn-jump-popover-gap: 18px;
      visibility: hidden;
      opacity: 0;
      pointer-events: none;
      transform: translateY(-50%) translateX(8px);
      transition: opacity 180ms cubic-bezier(0.2, 0.8, 0.2, 1),
        transform 180ms cubic-bezier(0.2, 0.8, 0.2, 1),
        right 190ms cubic-bezier(0.2, 0.8, 0.2, 1),
        visibility 0s linear 180ms;
      will-change: opacity, transform, right;
    }

    .main.sources-open .turn-jump {
      right: calc(var(--source-panel-width) + 18px);
    }

    .turn-jump.visible {
      visibility: visible;
      opacity: 1;
      pointer-events: auto;
      transform: translateY(-50%) translateX(0);
      transition-delay: 0s;
    }

    .turn-jump-rail {
      display: grid;
      gap: 5px;
      padding: 8px 4px;
      border-radius: 999px;
      cursor: default;
    }

    .turn-jump::before {
      content: "";
      position: absolute;
      top: 0;
      right: 100%;
      width: var(--turn-jump-popover-gap);
      height: 100%;
    }

    .turn-jump-tick {
      display: block;
      width: 22px;
      height: 2px;
      border-radius: 999px;
      background: #c7c7c7;
      transform-origin: right center;
      transition: height 180ms cubic-bezier(0.2, 0.8, 0.2, 1),
        background-color 180ms cubic-bezier(0.2, 0.8, 0.2, 1),
        transform 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
    }

    .turn-jump-tick.active {
      height: 3px;
      background: #1f2937;
    }

    .turn-jump:hover .turn-jump-tick,
    .turn-jump:focus-within .turn-jump-tick {
      background: #9f9f9f;
    }

    .turn-jump:hover .turn-jump-tick.active,
    .turn-jump:focus-within .turn-jump-tick.active {
      background: #111827;
    }

    .turn-jump-popover {
      position: absolute;
      right: calc(100% + var(--turn-jump-popover-gap));
      top: 50%;
      display: grid;
      gap: 2px;
      width: 322px;
      max-height: min(62vh, 520px);
      padding: 10px;
      overflow: auto;
      border: 1px solid var(--border);
      border-radius: 14px;
      background: var(--dialog-bg);
      box-shadow: var(--shadow);
      opacity: 0;
      pointer-events: none;
      visibility: hidden;
      transform: translateY(-50%) translateX(8px);
      transition: opacity 180ms cubic-bezier(0.2, 0.8, 0.2, 1),
        transform 180ms cubic-bezier(0.2, 0.8, 0.2, 1),
        visibility 0s linear 180ms;
      will-change: opacity, transform;
    }

    .turn-jump:hover .turn-jump-popover,
    .turn-jump:focus-within .turn-jump-popover {
      opacity: 1;
      pointer-events: auto;
      visibility: visible;
      transform: translateY(-50%) translateX(0);
      transition-delay: 0s;
    }

    .turn-jump-item {
      display: block;
      width: 100%;
      min-width: 0;
      padding: 9px 8px;
      border-radius: 8px;
      color: var(--text);
      background: transparent;
      cursor: pointer;
      overflow: hidden;
      text-align: left;
      text-overflow: ellipsis;
      white-space: nowrap;
      font-size: 14px;
      line-height: 1.35;
      transition: background-color 140ms ease, color 140ms ease, font-weight 140ms ease;
    }

    .turn-jump-item:hover,
    .turn-jump-item:focus-visible {
      background: var(--surface);
    }

    .turn-jump-item.active {
      color: var(--text);
      background: var(--surface-strong);
      font-weight: 650;
    }

    .avatar {
      display: none;
    }

    .message-body {
      min-width: 0;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: stretch;
    }

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

    .bubble {
      position: relative;
      min-width: 0;
      width: 100%;
      max-width: 100%;
    }

    .message.user .bubble {
      width: fit-content;
      max-width: min(720px, 88%);
      margin-left: auto;
      padding: 10px 14px;
      border-radius: 20px;
      background: var(--user-bubble);
    }

    .message.user .image-grid {
      width: min(720px, 88%);
      margin-left: auto;
    }

    .attachment-stack {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 8px;
      width: min(var(--content-width), 100%);
      margin: 0 0 8px;
    }

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

    .file-attachment-card {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      width: min(320px, 100%);
      min-height: 56px;
      padding: 7px 12px 7px 7px;
      border: 1px solid var(--border);
      border-radius: 11px;
      color: var(--text) !important;
      background: var(--dialog-bg);
      box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02);
      text-decoration: none !important;
      vertical-align: top;
    }

    .markdown .file-attachment-card {
      margin: 0.15em 0;
      line-height: 1.25;
    }

    .file-attachment-card:hover {
      border-color: var(--border);
      background: var(--surface);
      text-decoration: none !important;
    }

    .file-attachment-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      flex: 0 0 auto;
      width: 40px;
      height: 40px;
      border-radius: 8px;
      color: #fff;
      background: #5b79ff;
    }

    .file-attachment-icon svg {
      width: 19px;
      height: 19px;
      stroke: currentColor;
    }

    .file-attachment-body {
      display: grid;
      gap: 2px;
      min-width: 0;
      flex: 1 1 auto;
      line-height: 1.25;
    }

    .file-attachment-name {
      min-width: 0;
      overflow: hidden;
      color: var(--text);
      font-size: 14px;
      font-weight: 650;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .file-attachment-meta {
      overflow: hidden;
      color: var(--muted);
      font-size: 13px;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .file-attachment-download {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      flex: 0 0 auto;
      width: 24px;
      height: 24px;
      border-radius: 999px;
      color: var(--muted);
      opacity: 0;
      transition: opacity 120ms ease, background 120ms ease;
    }

    .file-attachment-card:hover .file-attachment-download,
    .file-attachment-card:focus-visible .file-attachment-download {
      opacity: 1;
    }

    .file-attachment-download svg {
      width: 16px;
      height: 16px;
      stroke: currentColor;
    }

    .message-actions {
      display: flex;
      justify-content: flex-start;
      gap: 6px;
      width: auto;
      margin: 4px 0 0;
      padding: 0;
      opacity: 1;
      transition: opacity 120ms ease;
    }

    .message.user .message-actions {
      width: auto;
      max-width: none;
      margin: 4px 8px 0 0;
      padding-right: 0;
      justify-content: flex-end;
      opacity: 0;
    }

    .message.user:hover .message-actions,
    .message.user:focus-within .message-actions {
      opacity: 1;
    }

    .mini-button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 30px;
      height: 30px;
      padding: 0;
      border-radius: 8px;
      color: var(--muted-strong);
      background: transparent;
      cursor: pointer;
      font-size: 0;
    }

    .mini-button:hover {
      background: var(--surface);
    }

    .mini-button svg {
      width: 18px;
      height: 18px;
      stroke: currentColor;
    }

    .source-button {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      width: auto;
      min-width: 0;
      padding: 0 8px;
      font-size: 12px;
      line-height: 1;
    }

    .source-button[aria-expanded="true"],
    .source-button:hover {
      background: var(--surface);
    }

    .source-dot {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 18px;
      height: 16px;
      color: var(--muted-strong);
      font-size: 0;
    }

    .source-dot.mixed {
      width: 25px;
    }

    .source-dot-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 17px;
      height: 17px;
      border: 1px solid var(--border);
      border-radius: 999px;
      color: var(--muted-strong);
      background: var(--surface);
    }

    .source-dot-icon + .source-dot-icon {
      margin-left: -7px;
    }

    .source-dot-icon svg {
      width: 11px;
      height: 11px;
      stroke: currentColor;
    }

    .source-button-label,
    .source-button-count {
      color: var(--muted-strong);
      font-size: 12px;
    }

    .source-button-count {
      color: var(--muted);
    }

    .markdown {
      overflow-wrap: anywhere;
      word-break: normal;
      color: var(--text);
      font-size: 16px;
      line-height: 1.72;
    }

    .markdown > :first-child {
      margin-top: 0;
    }

    .markdown > :last-child {
      margin-bottom: 0;
    }

    .markdown p {
      margin: 0 0 0.85em;
    }

    .markdown h1,
    .markdown h2,
    .markdown h3,
    .markdown h4 {
      margin: 1em 0 0.48em;
      line-height: 1.25;
      letter-spacing: 0;
    }

    .markdown h1 {
      font-size: 1.35rem;
    }

    .markdown h2 {
      font-size: 1.2rem;
    }

    .markdown h3,
    .markdown h4 {
      font-size: 1.05rem;
    }

    .markdown ul,
    .markdown ol {
      margin: 0 0 0.9em;
      padding-left: 1.45em;
    }

    .markdown li {
      margin: 0.2em 0;
    }

    .markdown blockquote {
      margin: 0 0 0.9em;
      padding: 0.1em 0 0.1em 1em;
      border-left: 3px solid var(--border);
      color: var(--muted-strong);
    }

    .md-div {
      position: relative;
      margin: 0 0 0.9em;
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: 10px;
      background: var(--surface);
    }

    .md-div > :first-child {
      margin-top: 0;
    }

    .md-div > :last-child {
      margin-bottom: 0;
    }

    .md-div--writing {
      border-left: 3px solid var(--accent);
    }

    .md-div-copy {
      position: absolute;
      top: 8px;
      right: 8px;
      z-index: 1;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 28px;
      height: 28px;
      padding: 0;
      border-radius: 8px;
      color: var(--muted-strong);
      background: transparent;
      cursor: pointer;
      font-size: 0;
      opacity: 0;
      pointer-events: none;
      transition: opacity 120ms ease, background 120ms ease;
    }

    .md-div:hover .md-div-copy,
    .md-div:focus-within .md-div-copy {
      opacity: 1;
      pointer-events: auto;
    }

    .md-div-copy:hover {
      background: var(--surface-strong);
    }

    .md-div-copy svg {
      width: 17px;
      height: 17px;
      stroke: currentColor;
    }

    .markdown-divider {
      width: 100%;
      height: 1px;
      margin: 1.45em 0;
      border: 0;
      background: var(--border-soft);
    }

    .markdown .math-display {
      display: block;
      margin: 0.75em 0;
      text-align: center;
      overflow-x: auto;
      overflow-y: hidden;
    }
    .markdown .math-display .katex-display {
      margin: 0;
    }
    .markdown .math-inline .katex {
      font-size: 1.05em;
    }
    .markdown .katex {
      color: inherit;
    }
    .markdown .math-fallback {
      font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
      font-size: 0.92em;
      opacity: 0.85;
    }

    .markdown table {
      width: 100%;
      min-width: min(100%, 520px);
      max-width: 100%;
      margin: 0;
      border-collapse: collapse;
      border-spacing: 0;
      table-layout: fixed;
      font-size: 14px;
      overflow-wrap: normal;
      word-break: normal;
    }

    .markdown col.table-col-label {
      width: 136px;
    }

    .markdown col.table-col-data {
      width: auto;
    }

    .markdown th,
    .markdown td {
      padding: 12px 22px 12px 0;
      border-bottom: 1px solid var(--border-soft);
      vertical-align: top;
      text-align: left;
      line-height: 1.55;
      overflow-wrap: normal;
      word-break: normal;
      word-wrap: normal;
      white-space: normal;
    }

    .markdown th + th,
    .markdown td + td {
      padding-left: 18px;
    }

    .markdown th:first-child,
    .markdown td:first-child {
      width: 136px;
      min-width: 136px;
      padding-right: 24px;
      padding-left: 0;
      white-space: nowrap;
    }

    .markdown th:last-child,
    .markdown td:last-child {
      padding-right: 34px;
    }

    .markdown th.align-center,
    .markdown td.align-center {
      text-align: center;
    }

    .markdown th.align-right,
    .markdown td.align-right {
      text-align: right;
    }

    .markdown th:first-child,
    .markdown td:first-child {
      text-align: left;
    }

    .markdown th {
      color: var(--text);
      font-weight: 650;
    }

    .markdown tbody tr:last-child td {
      border-bottom: 0;
    }

    .table-wrap {
      position: relative;
      width: 100%;
      max-width: 100%;
      margin: 0 0 1.15em;
      padding-top: 2px;
    }

    .table-toolbar {
      position: absolute;
      top: 0;
      right: 0;
      z-index: 1;
      display: flex;
      justify-content: flex-end;
      pointer-events: none;
    }

    .table-copy {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 28px;
      height: 28px;
      padding: 0;
      border-radius: 8px;
      color: var(--muted-strong);
      background: transparent;
      cursor: pointer;
      font-size: 0;
      opacity: 0;
      pointer-events: none;
      transition: opacity 120ms ease, background 120ms ease;
    }

    .table-wrap:hover .table-copy,
    .table-wrap:focus-within .table-copy {
      opacity: 1;
      pointer-events: auto;
    }

    .table-copy:hover {
      background: var(--surface);
    }

    .table-copy svg {
      width: 17px;
      height: 17px;
      stroke: currentColor;
    }

    .table-scroll {
      width: 100%;
      max-width: 100%;
      overflow-x: auto;
    }

    .table-scroll table {
      margin-bottom: 0;
    }

    .markdown a {
      color: var(--link);
      text-decoration: none;
    }

    .markdown a:hover {
      text-decoration: underline;
    }

    .markdown sup a {
      font-size: 0.78em;
      font-weight: 650;
      text-decoration: none;
    }

    .citation-chip {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      max-width: 138px;
      height: 19px;
      margin: 0 3px;
      padding: 0 7px 0 5px;
      border-radius: 999px;
      color: var(--muted-strong) !important;
      background: var(--surface-strong);
      font-size: 11px;
      line-height: 19px;
      text-decoration: none !important;
      vertical-align: -3px;
      white-space: nowrap;
    }

    .citation-chip:hover {
      background: var(--surface-hover);
      text-decoration: none;
    }

    .citation-chip svg {
      flex: 0 0 auto;
      width: 12px;
      height: 12px;
      stroke: currentColor;
    }

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

    .markdown td .citation-chip {
      max-width: 116px;
      height: 18px;
      margin-left: 4px;
      margin-right: 0;
      font-size: 10.5px;
      line-height: 18px;
      vertical-align: -2px;
    }

    .source-panel {
      display: flex;
      flex-direction: column;
      min-width: 0;
      min-height: 0;
      background: var(--bg);
      border-left: 1px solid transparent;
      opacity: 0;
      overflow: hidden;
      pointer-events: none;
      transform: translateX(22px);
      transition: opacity 180ms ease, transform 190ms ease;
    }

    .main.sources-open .source-panel {
      border-left-color: var(--border-soft);
      opacity: 1;
      pointer-events: auto;
      transform: translateX(0);
    }

    .source-panel-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      min-height: 54px;
      padding: 12px 14px 10px 18px;
      border-bottom: 1px solid var(--border-soft);
    }

    .source-panel-title {
      margin: 0;
      color: var(--text);
      font-size: 15px;
      font-weight: 650;
    }

    .source-panel-close {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      border-radius: 8px;
      color: var(--muted-strong);
      background: transparent;
      cursor: pointer;
      font-size: 22px;
      line-height: 1;
    }

    .source-panel-close:hover {
      background: var(--surface);
    }

    .source-panel-list {
      flex: 1;
      min-height: 0;
      overflow: auto;
      padding: 12px 14px 24px;
    }

    .source-card {
      display: block;
      padding: 12px 4px;
      color: var(--text);
      text-decoration: none;
      border-radius: 8px;
    }

    .source-card:hover {
      background: var(--surface);
    }

    .source-card-top {
      display: flex;
      align-items: center;
      gap: 7px;
      margin-bottom: 5px;
      color: var(--text);
      font-size: 12px;
      font-weight: 500;
    }

    .source-card-top svg {
      flex: 0 0 auto;
      width: 15px;
      height: 15px;
      stroke: currentColor;
    }

    .source-card-title {
      margin: 0 0 4px;
      display: -webkit-box;
      overflow: hidden;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      color: var(--text);
      font-size: 14px;
      line-height: 1.35;
      font-weight: 700;
    }

    .source-card-url {
      display: -webkit-box;
      overflow: hidden;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.35;
    }

    .markdown code:not(pre code) {
      padding: 0.12em 0.32em;
      border-radius: 5px;
      background: var(--surface-strong);
      font-size: 0.92em;
      font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    }

    .code-block {
      margin: 0 0 1em;
      overflow: hidden;
      border-radius: 10px;
      background: var(--code-bg);
    }

    .code-toolbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 34px;
      padding: 6px 10px;
      color: #cbd5e1;
      background: rgba(255, 255, 255, 0.06);
      font-size: 12px;
    }

    .code-copy {
      color: #e2e8f0;
      background: transparent;
      cursor: pointer;
      font-size: 12px;
    }

    .code-copy:hover {
      color: #fff;
    }

    pre {
      margin: 0;
      overflow: auto;
      padding: 14px;
      color: var(--code-text);
      font-size: 13px;
      line-height: 1.55;
    }

    pre code {
      font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
      white-space: pre;
    }

    .image-grid {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 12px;
      width: min(var(--content-width), 100%);
      margin: 12px auto 0;
    }

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

    .image-item {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 6px;
      max-width: min(100%, 720px);
    }

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

    .image-frame {
      display: inline-flex;
      max-width: 100%;
      width: auto;
      overflow: hidden;
      padding: 0;
      border: 1px solid var(--border-soft);
      border-radius: 14px;
      background: var(--image-bg);
      cursor: zoom-in;
      line-height: 0;
      vertical-align: top;
    }

    .markdown .image-frame {
      margin: 0 0 1em;
      max-width: 100%;
      width: auto;
    }

    .image-item .image-frame {
      margin: 0;
    }

    .image-frame img {
      display: block;
      width: auto;
      max-width: 100%;
      max-height: min(72vh, 720px);
      object-fit: contain;
      background: var(--image-bg);
    }

    .notice {
      width: min(var(--content-width), 100%);
      margin: 0 auto;
      padding: 24px;
      color: var(--muted);
    }

    .asset-library {
      display: none;
      min-height: 100%;
      padding: 0 max(24px, calc((100% - 768px) / 2)) 96px;
    }

    .asset-library.visible {
      display: block;
    }

    .asset-library-header {
      position: sticky;
      top: 0;
      z-index: 4;
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(220px, 240px);
      align-items: start;
      gap: 22px 24px;
      margin: 0 calc(-1 * max(24px, calc((100% - 768px) / 2))) 24px;
      padding: 50px max(24px, calc((100% - 768px) / 2)) 12px;
      border-bottom: 1px solid var(--border-soft);
      background: var(--bg);
    }

    .asset-library-title {
      margin: 0;
      font-size: 30px;
      line-height: 1.2;
      letter-spacing: 0;
    }

    .asset-library-meta {
      margin-top: 6px;
      color: var(--muted);
      font-size: 13px;
    }

    .asset-library-actions {
      display: grid;
      grid-template-columns: minmax(0, 240px);
      align-items: start;
      justify-content: flex-end;
      gap: 12px;
      min-width: 0;
    }

    .library-toolbar {
      display: flex;
      justify-content: flex-end;
      margin: -68px 0 44px;
    }

    .library-search {
      display: flex;
      align-items: center;
      gap: 8px;
      width: 100%;
      min-height: 36px;
      padding: 0 12px;
      border: 1px solid var(--border);
      border-radius: 999px;
      color: var(--muted);
      background: var(--bg);
    }

    .library-search svg {
      width: 16px;
      height: 16px;
      stroke: currentColor;
    }

    .library-search input {
      min-width: 0;
      flex: 1;
      border: 0;
      outline: 0;
      color: var(--text);
      background: transparent;
    }

    .library-controls {
      grid-column: 1 / -1;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      min-width: 0;
      padding-top: 2px;
      background: var(--bg);
    }

    .library-tabs {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .library-tab,
    .library-bulk-button,
    .library-layout-button {
      min-height: 36px;
      border-radius: 999px;
      color: var(--muted-strong);
      background: transparent;
      cursor: pointer;
    }

    .library-tab {
      padding: 0 16px;
    }

    .library-tab.active,
    .library-tab:hover,
    .library-bulk-button:hover,
    .library-layout-button.active,
    .library-layout-button:hover {
      color: var(--text);
      background: var(--surface-strong);
    }

    .library-bulk-actions,
    .library-control-right,
    .library-layout-toggle {
      display: flex;
      align-items: center;
      gap: 8px;
      min-width: 0;
    }

    .library-bulk-actions {
      flex-wrap: wrap;
    }

    .library-bulk-button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 0 14px;
      border: 1px solid var(--border);
      background: var(--bg);
      white-space: nowrap;
    }

    .library-bulk-button.primary {
      border-color: transparent;
      color: #fff;
      background: #050505;
    }

    :root[data-theme="dark"] .library-bulk-button.primary {
      color: #111;
      background: #f7f7f7;
    }

    .library-bulk-button.danger {
      color: #ff3b30;
      border-color: rgba(255, 59, 48, 0.55);
      background: transparent;
    }

    .library-bulk-button svg {
      width: 16px;
      height: 16px;
      stroke: currentColor;
      flex: 0 0 auto;
    }

    .library-selected-count {
      color: var(--muted-strong);
      white-space: nowrap;
    }

    .library-control-divider {
      width: 1px;
      height: 24px;
      background: var(--border-soft);
    }

    .library-sort-wrap {
      position: relative;
    }

    .library-menu {
      position: absolute;
      right: 0;
      top: calc(100% + 8px);
      z-index: 9;
      display: none;
      min-width: 180px;
      padding: 6px;
      border: 1px solid var(--border);
      border-radius: 12px;
      background: var(--dialog-bg);
      box-shadow: var(--shadow);
    }

    .library-menu.visible {
      display: grid;
    }

    .library-menu button {
      display: flex;
      align-items: center;
      gap: 10px;
      width: 100%;
      min-height: 36px;
      padding: 0 10px;
      border-radius: 8px;
      color: var(--text);
      background: transparent;
      cursor: pointer;
      text-align: left;
    }

    .library-menu button:hover,
    .library-menu button.active {
      background: var(--surface);
    }

    .library-menu button svg {
      width: 16px;
      height: 16px;
      stroke: currentColor;
      flex: 0 0 auto;
    }

    .library-sort-menu button:not(.active) svg {
      opacity: 0;
    }

    .library-layout-button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      padding: 0;
    }

    .library-layout-button svg {
      width: 18px;
      height: 18px;
      stroke: currentColor;
    }

    .library-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 18px;
    }

    .library-card {
      position: relative;
      display: block;
      min-width: 0;
      color: var(--text);
      background: transparent;
      border-radius: 16px;
      text-align: left;
      transition: transform 140ms ease, filter 140ms ease;
    }

    .library-card:hover {
      transform: translateY(-1px);
    }

    .library-card-open {
      display: grid;
      width: 100%;
      min-width: 0;
      padding: 0;
      color: inherit;
      background: transparent;
      border-radius: inherit;
      cursor: pointer;
      text-align: left;
    }

    .library-card-preview {
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      aspect-ratio: 1 / 1;
      overflow: hidden;
      border: 1px solid var(--border-soft);
      border-radius: 16px;
      background: var(--surface);
      box-shadow: 0 14px 28px rgba(0, 0, 0, 0.08);
      transition: border-color 140ms ease, box-shadow 140ms ease;
    }

    .library-card.selected .library-card-preview {
      border-color: #5b79ff;
      box-shadow: 0 0 0 2px rgba(91, 121, 255, 0.35), 0 14px 28px rgba(0, 0, 0, 0.1);
    }

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

    .library-card-overlay {
      position: absolute;
      inset: 0;
      z-index: 1;
      display: grid;
      grid-template-rows: auto minmax(0, 1fr) auto;
      align-items: start;
      min-width: 0;
      padding: 12px 48px 12px 12px;
      color: #fff;
      background:
        linear-gradient(180deg, rgba(0, 0, 0, 0.58), rgba(0, 0, 0, 0.12) 42%, rgba(0, 0, 0, 0.5)),
        linear-gradient(90deg, rgba(0, 0, 0, 0.34), rgba(0, 0, 0, 0));
      opacity: 0;
      pointer-events: none;
      transition: opacity 140ms ease;
    }

    .library-card:hover .library-card-overlay,
    .library-card:focus-within .library-card-overlay {
      opacity: 1;
    }

    .library-card-name,
    .library-card-size {
      display: block;
      width: 100%;
      min-width: 0;
      max-width: 100%;
      overflow: hidden;
      border-radius: 7px;
      text-overflow: ellipsis;
      white-space: nowrap;
      text-shadow: 0 1px 2px rgba(0, 0, 0, 0.55);
    }

    .library-card-name {
      grid-row: 1;
      font-weight: 600;
      line-height: 1.25;
    }

    .library-card-size {
      grid-row: 3;
      font-size: 12px;
      font-weight: 600;
      line-height: 1.2;
    }

    .library-select-toggle {
      position: absolute;
      top: 14px;
      right: 14px;
      z-index: 2;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 24px;
      height: 24px;
      padding: 0;
      border: 1px solid var(--border);
      border-radius: 999px;
      color: #fff;
      background: rgba(255, 255, 255, 0.82);
      box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
      cursor: pointer;
    }

    .library-select-toggle svg {
      width: 16px;
      height: 16px;
      stroke: currentColor;
    }

    .library-card.selected .library-select-toggle,
    .library-row.selected .library-select-toggle {
      border-color: #5b79ff;
      background: #5b79ff;
    }

    .library-card-actions {
      position: absolute;
      right: 12px;
      top: 50%;
      z-index: 2;
      display: grid;
      gap: 8px;
      opacity: 0;
      transform: translateY(-50%);
      pointer-events: none;
      transition: opacity 140ms ease;
    }

    .library-card:hover .library-card-actions,
    .library-card:focus-within .library-card-actions {
      opacity: 1;
      pointer-events: auto;
    }

    .library-item-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 28px;
      height: 28px;
      padding: 0;
      border-radius: 8px;
      color: var(--muted-strong);
      background: rgba(255, 255, 255, 0.84);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
      cursor: pointer;
    }

    :root[data-theme="dark"] .library-item-action {
      background: rgba(32, 33, 35, 0.9);
    }

    .library-item-action:hover {
      color: var(--text);
      background: var(--bg);
    }

    .library-item-action.danger {
      color: #ff3b30;
    }

    .library-item-action svg {
      width: 16px;
      height: 16px;
      stroke: currentColor;
    }

    .library-file-icon,
    .library-row-thumb {
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .library-file-icon {
      width: 44px;
      height: 44px;
      color: #5b79ff;
    }

    .library-file-icon svg {
      width: 30px;
      height: 30px;
      stroke: currentColor;
    }

    .library-table {
      display: grid;
    }

    .library-table-head,
    .library-row {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 160px 96px;
      align-items: center;
      gap: 24px;
    }

    .library-table-head {
      min-height: 36px;
      color: var(--muted-strong);
      font-size: 13px;
    }

    .library-row {
      position: relative;
      min-height: 66px;
      border-bottom: 1px solid var(--border-soft);
      color: var(--text);
      text-decoration: none;
      background: transparent;
      text-align: left;
      cursor: pointer;
    }

    .library-row:hover {
      background: var(--surface);
    }

    .library-row.selected {
      background: rgba(91, 121, 255, 0.1);
    }

    .library-row-name {
      display: flex;
      align-items: center;
      gap: 12px;
      min-width: 0;
    }

    .library-row .library-select-toggle {
      position: static;
      flex: 0 0 auto;
      box-shadow: none;
      background: var(--bg);
    }

    .library-row-open {
      display: grid;
      min-width: 0;
      color: inherit;
      background: transparent;
      cursor: pointer;
      text-align: left;
    }

    .library-row-open span,
    .library-row-open small {
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
    }

    .library-row-open small {
      color: var(--muted);
      font-size: 12px;
    }

    .library-row-name > span:last-child,
    .library-row > span {
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
    }

    .library-row-thumb {
      flex: 0 0 auto;
      width: 32px;
      height: 32px;
      overflow: hidden;
      border: 1px solid var(--border);
      border-radius: 8px;
      background: var(--surface);
    }

    .library-row-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    mark {
      border-radius: 4px;
      padding: 0 2px;
      background: var(--mark);
      color: inherit;
    }

    .search-modal {
      position: fixed;
      inset: 0;
      z-index: 45;
      display: grid;
      place-items: center;
      padding: 18px;
      background: var(--modal-overlay);
      opacity: 0;
      pointer-events: none;
      transition: opacity 160ms ease;
      backdrop-filter: blur(1px);
    }

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

    .search-dialog {
      width: min(680px, calc(100vw - 32px));
      max-height: min(70vh, 560px);
      display: flex;
      flex-direction: column;
      overflow: hidden;
      border: 1px solid var(--border);
      border-radius: 15px;
      background: var(--dialog-bg);
      box-shadow: var(--shadow);
      opacity: 0;
      transform: translateY(18px) scale(0.985);
      transition: opacity 170ms ease, transform 190ms cubic-bezier(0.2, 0.8, 0.2, 1);
    }

    .search-modal.visible .search-dialog {
      opacity: 1;
      transform: translateY(0) scale(1);
    }

    .search-dialog-head {
      display: flex;
      align-items: center;
      gap: 8px;
      min-height: 64px;
      padding: 0 18px 0 22px;
      border-bottom: 1px solid var(--border-soft);
    }

    .search-dialog-icon {
      display: none;
    }

    .search-dialog-icon svg {
      width: 20px;
      height: 20px;
      stroke: currentColor;
    }

    .search-modal-input {
      flex: 1;
      min-width: 0;
      min-height: 62px;
      border: 0;
      padding: 0;
      color: var(--text);
      background: transparent;
      font-size: 16px;
      line-height: 1.35;
    }

    .search-modal-input:focus-visible {
      outline: 0;
    }

    .search-modal-input::placeholder {
      color: var(--muted);
    }

    .search-modal-close {
      flex: 0 0 auto;
      width: 32px;
      height: 32px;
      border-radius: 8px;
      color: var(--muted);
      background: transparent;
      cursor: pointer;
      font-size: 24px;
      line-height: 1;
    }

    .search-modal-close:hover {
      background: var(--surface);
    }

    .search-results {
      flex: 1;
      min-height: 0;
      overflow: auto;
      padding: 8px 10px 12px;
    }

    .search-results-heading {
      padding: 10px 12px 6px;
      color: var(--muted);
      font-size: 12px;
      font-weight: 650;
    }

    .search-result {
      display: grid;
      grid-template-columns: 28px minmax(0, 1fr);
      align-items: center;
      gap: 12px;
      width: 100%;
      min-height: 44px;
      padding: 8px 14px;
      border-radius: 10px;
      color: var(--text);
      background: transparent;
      cursor: pointer;
      text-align: left;
    }

    .search-result:hover,
    .search-result.active {
      background: var(--surface);
    }

    .search-result-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 24px;
      height: 24px;
      color: var(--muted-strong);
      background: transparent;
    }

    .search-result-icon svg {
      width: 19px;
      height: 19px;
      stroke: currentColor;
    }

    .search-result-main {
      min-width: 0;
    }

    .search-result-title,
    .search-result-snippet {
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
    }

    .search-result-title {
      font-size: 14px;
      font-weight: 450;
    }

    .search-result-snippet {
      margin-top: 2px;
      color: var(--muted);
      font-size: 12px;
    }

    .search-empty {
      padding: 28px 14px 30px;
      color: var(--muted);
      text-align: center;
    }

    .import-choice-modal {
      position: fixed;
      inset: 0;
      z-index: 46;
      display: grid;
      place-items: center;
      padding: 18px;
      background: var(--modal-overlay);
      opacity: 0;
      pointer-events: none;
      transition: opacity 150ms ease;
      backdrop-filter: blur(1px);
    }

    .import-choice-modal.visible {
      opacity: 1;
      pointer-events: auto;
    }

    .import-choice-dialog {
      width: min(450px, 100%);
      overflow: hidden;
      border: 1px solid var(--border);
      border-radius: 16px;
      background: var(--dialog-bg);
      box-shadow: var(--shadow);
      opacity: 0;
      transform: translateY(8px);
      transition: opacity 120ms ease, transform 140ms ease;
    }

    .import-choice-modal.visible .import-choice-dialog {
      opacity: 1;
      transform: translateY(0) scale(1);
    }

    .import-choice-title {
      margin: 0 0 4px;
      font-size: 20px;
      line-height: 1.35;
      font-weight: 650;
    }

    .import-choice-copy {
      margin: 0 0 16px;
      color: var(--muted);
      font-size: 13px;
    }

    .remember-choice,
    .settings-check {
      display: flex;
      align-items: center;
      gap: 8px;
      margin: 10px 0 0;
      color: var(--muted-strong);
      font-size: 13px;
      cursor: pointer;
    }

    .remember-choice input,
    .settings-check input {
      flex: 0 0 auto;
      width: 16px;
      height: 16px;
      accent-color: var(--accent);
    }

    .import-choice-options {
      display: grid;
      gap: 8px;
    }

    .import-choice-option {
      display: grid;
      gap: 2px;
      width: 100%;
      min-height: 58px;
      padding: 11px 12px;
      border: 1px solid var(--border);
      border-radius: 10px;
      color: var(--text);
      background: transparent;
      cursor: pointer;
      text-align: left;
    }

    .import-choice-option:focus-visible {
      outline: 0;
    }

    .import-choice-option:hover {
      background: var(--surface);
    }

    .import-choice-option.selected {
      background: var(--surface);
      border-color: var(--border);
    }

    .import-choice-option strong {
      font-size: 14px;
      font-weight: 600;
    }

    .import-choice-option span {
      color: var(--muted);
      font-size: 12px;
    }

    .import-summary-popup {
      position: fixed;
      left: 50%;
      top: 18px;
      z-index: 49;
      display: grid;
      gap: 4px;
      width: min(340px, calc(100vw - 32px));
      padding: 12px 14px;
      border: 1px solid var(--border);
      border-radius: 12px;
      background: var(--dialog-bg);
      box-shadow: var(--shadow);
      opacity: 0;
      pointer-events: none;
      transform: translateX(-50%) translateY(-8px);
      transition: opacity 150ms ease, transform 160ms ease;
    }

    .import-summary-popup.visible {
      opacity: 1;
      transform: translateX(-50%) translateY(0);
    }

    .import-summary-name {
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
      color: var(--muted-strong);
      font-size: 13px;
      font-weight: 700;
    }

    .import-summary-stats,
    .import-summary-status {
      color: var(--muted);
      font-size: 12px;
    }

    .toast {
      position: fixed;
      left: 50%;
      bottom: 22px;
      z-index: 50;
      transform: translateX(-50%) translateY(12px);
      min-width: 160px;
      max-width: min(420px, calc(100vw - 32px));
      padding: 10px 13px;
      border-radius: var(--radius);
      color: #fff;
      background: rgba(32, 33, 35, 0.92);
      box-shadow: var(--shadow);
      opacity: 0;
      pointer-events: none;
      transition: transform 140ms ease, opacity 140ms ease;
      text-align: center;
    }

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

    .settings-modal {
      position: fixed;
      inset: 0;
      z-index: 90;
      display: grid;
      place-items: center;
      padding: 20px;
      background: rgba(0, 0, 0, 0.32);
      opacity: 0;
      pointer-events: none;
      transition: opacity 160ms ease;
    }

    .settings-modal.visible {
      opacity: 1;
      pointer-events: auto;
    }

    .settings-dialog {
      width: min(440px, 100%);
      overflow: hidden;
      color: var(--text);
      background: var(--dialog-bg);
      border: 1px solid var(--border);
      border-radius: 16px;
      box-shadow: var(--shadow);
      opacity: 0;
      transform: translateY(8px) scale(0.98);
      transition: transform 160ms ease, opacity 160ms ease;
    }

    .settings-modal.visible .settings-dialog {
      opacity: 1;
      transform: translateY(0) scale(1);
    }

    .app-dialog-modal {
      position: fixed;
      inset: 0;
      z-index: 96;
      display: grid;
      place-items: center;
      padding: 20px;
      background: var(--modal-overlay);
      opacity: 0;
      pointer-events: none;
      transition: opacity 160ms ease;
      backdrop-filter: blur(1px);
    }

    .app-dialog-modal.visible {
      opacity: 1;
      pointer-events: auto;
    }

    .app-dialog {
      width: min(420px, 100%);
      overflow: hidden;
      color: var(--text);
      background: var(--dialog-bg);
      border: 1px solid var(--border);
      border-radius: 16px;
      box-shadow: var(--shadow);
      opacity: 0;
      transform: translateY(8px) scale(0.98);
      transition: transform 160ms ease, opacity 160ms ease;
    }

    .app-dialog-modal.visible .app-dialog {
      opacity: 1;
      transform: translateY(0) scale(1);
    }

    .app-dialog-title {
      margin: 0 0 6px;
      font-size: 20px;
      line-height: 1.35;
      font-weight: 650;
    }

    .app-dialog-copy {
      margin: 0;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.5;
    }

    .app-dialog-field {
      display: grid;
      gap: 6px;
      margin-top: 16px;
      color: var(--muted-strong);
      font-size: 13px;
    }

    .app-dialog-field[hidden] {
      display: none;
    }

    .app-dialog-field input {
      width: 100%;
      min-height: 38px;
      padding: 0 12px;
      color: var(--text);
      background: var(--dialog-bg);
      border: 1px solid var(--border);
      border-radius: 8px;
      font: inherit;
    }

    .app-dialog-field input:focus-visible {
      outline: 0;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.18);
    }

    .settings-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 16px;
    }

    .settings-title {
      margin: 0;
      font-size: 20px;
      font-weight: 650;
      letter-spacing: 0;
    }

    .settings-close {
      width: 32px;
      height: 32px;
      border-radius: 8px;
      color: var(--muted);
      background: transparent;
      cursor: pointer;
    }

    .settings-close:hover {
      background: var(--surface);
    }

    .settings-body {
      display: grid;
      gap: 12px;
    }

    .settings-field {
      display: grid;
      gap: 6px;
      color: var(--muted-strong);
      font-size: 13px;
    }

    .settings-field select {
      width: 100%;
      min-height: 38px;
      padding: 0 12px;
      color: var(--text);
      background: var(--dialog-bg);
      border: 1px solid var(--border);
      border-radius: 8px;
      font: inherit;
    }

    .settings-field select:focus-visible {
      outline: 0;
    }

    .settings-section {
      display: grid;
      gap: 8px;
      padding-top: 4px;
    }

    .settings-section-title {
      margin: 0;
      color: var(--text);
      font-size: 14px;
      font-weight: 650;
    }

    .settings-section-copy {
      margin: 0;
      color: var(--muted);
      font-size: 13px;
    }

    .storage-summary {
      display: grid;
      border: 1px solid var(--border);
      border-radius: 10px;
      overflow: hidden;
    }

    .storage-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      min-height: 38px;
      padding: 0 12px;
      color: var(--muted-strong);
      font-size: 13px;
    }

    .storage-row + .storage-row {
      border-top: 1px solid var(--border-soft);
    }

    .storage-row strong {
      color: var(--text);
      font-weight: 650;
    }

    .data-management {
      margin-top: 2px;
      padding-top: 12px;
      border-top: 1px solid var(--border-soft);
    }

    .danger-button {
      justify-self: start;
      min-height: 36px;
      padding: 7px 14px;
      border: 1px solid rgba(180, 35, 24, 0.38);
      border-radius: 999px;
      color: #fff;
      background: var(--danger);
      cursor: pointer;
      font-weight: 650;
    }

    .danger-button:hover {
      filter: brightness(0.94);
    }

    .settings-check {
      margin: 2px 0 0;
    }

    .modal {
      position: fixed;
      inset: 0;
      z-index: 35;
      display: none;
      place-items: center;
      padding: 24px;
      background: rgba(0, 0, 0, 0.72);
    }

    .modal.visible {
      display: grid;
    }

    .modal img {
      max-width: 100%;
      max-height: 88vh;
      border-radius: var(--radius);
      background: var(--image-bg);
      box-shadow: var(--shadow);
    }

    .modal-close {
      position: fixed;
      top: 18px;
      right: 18px;
      width: 38px;
      height: 38px;
      border-radius: 50%;
      color: #fff;
      background: rgba(255, 255, 255, 0.18);
      cursor: pointer;
      font-size: 24px;
      line-height: 1;
    }

    .busy {
      cursor: progress;
    }

    .pdf-export-modal {
      position: fixed;
      inset: 0;
      z-index: 200;
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--modal-overlay);
      opacity: 0;
      visibility: hidden;
      transition: opacity 180ms ease, visibility 0s linear 180ms;
    }

    .pdf-export-modal[aria-hidden="false"] {
      opacity: 1;
      visibility: visible;
      transition-delay: 0s;
    }

    .pdf-export-dialog {
      width: min(440px, calc(100vw - 32px));
      max-height: calc(100vh - 64px);
      overflow: auto;
      border-radius: 16px;
      background: var(--dialog-bg);
      box-shadow: var(--shadow);
      transform: translateY(12px) scale(0.97);
      transition: transform 200ms cubic-bezier(0.2, 0.8, 0.2, 1);
    }

    .pdf-export-modal[aria-hidden="false"] .pdf-export-dialog {
      transform: translateY(0) scale(1);
    }

    .pdf-export-preview-hint {
      padding: 0 24px 8px;
    }

    .pdf-export-preview-hint p {
      margin: 0;
      padding: 12px 14px;
      border-radius: 10px;
      background: var(--surface);
      color: var(--muted);
      font-size: 13px;
      line-height: 1.5;
    }

    .checkbox-field {
      display: flex !important;
      flex-direction: row !important;
      align-items: center !important;
      gap: 10px;
    }

    .checkbox-field input[type="checkbox"] {
      width: 18px;
      height: 18px;
      margin: 0;
      accent-color: var(--accent);
      cursor: pointer;
    }

    @media (max-width: 840px) {
      body {
        overflow: hidden;
      }

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

      .app.sidebar-collapsed {
        grid-template-columns: 1fr;
      }

      .app.sidebar-collapsed .sidebar {
        opacity: 1;
        pointer-events: auto;
        transform: translateX(-100%);
      }

      .app.sidebar-collapsed .sidebar-panel {
        display: flex;
      }

      .app.sidebar-collapsed .sidebar-rail {
        display: none;
      }

      .sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        z-index: 20;
        width: min(86vw, var(--sidebar-width));
        transform: translateX(-100%);
        box-shadow: var(--shadow);
        transition: transform 160ms ease;
      }

      .sidebar.open {
        transform: translateX(0);
      }

      .main,
      .main.sources-open {
        grid-template-columns: 1fr;
      }

      .source-panel {
        position: fixed;
        inset: 0 0 0 auto;
        z-index: 28;
        width: min(88vw, var(--source-panel-width));
        box-shadow: var(--shadow);
      }

      .main:not(.sources-open) .source-panel {
        transform: translateX(100%);
      }

      .mobile-topbar {
        display: grid;
      }

      .app:not(.sidebar-collapsed) .mobile-topbar {
        display: grid;
      }

      .thread-header {
        display: none;
      }

      .thread-title {
        font-size: 16px;
        text-align: left;
      }

      .reader.visible .thread-pdf-button {
        display: none;
      }

      .message-inner {
        width: 100%;
        padding: 14px 16px;
      }

      .message.user .bubble {
        width: fit-content;
        max-width: 90%;
      }

      .message.user .image-grid {
        width: 90%;
      }

      .markdown {
        font-size: 15px;
        line-height: 1.68;
      }

      .markdown th:first-child,
      .markdown td:first-child {
        width: 112px;
        min-width: 112px;
        padding-right: 16px;
      }

      .markdown col.table-col-label {
        width: 112px;
      }

      .image-grid {
        width: 100%;
        padding-left: 16px;
        padding-right: 16px;
      }

      .image-frame,
      .markdown .image-frame {
        max-width: 100%;
        width: auto;
        border-radius: 12px;
      }

      .asset-library {
        padding: 0 16px 72px;
      }

      .asset-library-header {
        align-items: stretch;
        margin: 0 -16px;
        padding: 24px 16px 16px;
      }

      .asset-library-header,
      .library-controls {
        display: grid;
      }

      .library-controls {
        margin: 0;
        padding: 10px 0 0;
      }

      .asset-library-actions {
        justify-content: stretch;
      }

      .library-bulk-button span {
        display: none;
      }

      .library-bulk-button {
        width: 38px;
        padding: 0;
      }

      .library-toolbar {
        margin: 0 0 18px;
        justify-content: stretch;
      }

      .library-search {
        width: 100%;
      }

      .library-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 12px;
      }

      .library-card-actions {
        opacity: 1;
        pointer-events: auto;
      }

      .library-table-head,
      .library-row {
        grid-template-columns: minmax(0, 1fr) 72px;
        gap: 12px;
      }

      .library-table-head span:nth-child(2),
      .library-row > span:nth-child(2) {
        display: none;
      }

      .empty-state {
        min-height: calc(100% - 48px);
        padding: 18px;
      }

      .drop-zone {
        min-height: 230px;
      }

      .message-actions {
        opacity: 1;
      }

      .turn-jump {
        display: none !important;
      }

      .search-modal {
        padding: 7vh 12px 12px;
      }

      .search-dialog {
        max-height: 78vh;
        border-radius: 14px;
      }
    }