/* =============================================================================
   Chat bot — page-scoped styling.

   The chat-bot reuses the docs shell (.topbar / .sidebar from site.js) and
   replaces the main column with a full-height IDE-style chat app. All
   selectors are scoped to body[data-page="chat-bot"] so they don't leak
   into other docs pages. Tokens come from site.css.
   ========================================================================== */

   body[data-page="chat-bot"] {
    /* Mode-flavoured accent palette — overridden per mode further down. */
    --cb-accent-1: #6366f1;
    --cb-accent-2: #8b5cf6;
    --cb-accent-3: #ec4899;
    --cb-accent-grad: linear-gradient(135deg, var(--cb-accent-1) 0%, var(--cb-accent-2) 50%, var(--cb-accent-3) 100%);
    --cb-accent-grad-soft: linear-gradient(135deg,
      color-mix(in srgb, var(--cb-accent-1) 14%, transparent),
      color-mix(in srgb, var(--cb-accent-3) 14%, transparent));
    --cb-glow: 0 12px 40px -10px color-mix(in srgb, var(--cb-accent-2) 55%, transparent);
  }
  
  body[data-page="chat-bot"][data-mode="chat-compact"] {
    --cb-accent-1: #06b6d4; --cb-accent-2: #6366f1; --cb-accent-3: #8b5cf6;
  }
  body[data-page="chat-bot"][data-mode="chat-full"] {
    --cb-accent-1: #6366f1; --cb-accent-2: #8b5cf6; --cb-accent-3: #ec4899;
  }
  body[data-page="chat-bot"][data-mode="website"] {
    --cb-accent-1: #f59e0b; --cb-accent-2: #ec4899; --cb-accent-3: #8b5cf6;
  }
  body[data-page="chat-bot"][data-mode="app"] {
    --cb-accent-1: #10b981; --cb-accent-2: #06b6d4; --cb-accent-3: #6366f1;
  }
  
  body[data-page="chat-bot"] .layout > main {
    padding: 0;
    max-width: none;
  }
  
  .cb-app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    min-height: 520px;
    background:
      radial-gradient(80vw 60vh at 100% -10%, color-mix(in srgb, var(--cb-accent-1) 10%, transparent), transparent 60%),
      radial-gradient(60vw 50vh at -10% 110%, color-mix(in srgb, var(--cb-accent-3) 9%, transparent), transparent 60%),
      var(--doc-bg);
    color: var(--doc-text);
    font-family: var(--doc-font);
    isolation: isolate;
    position: relative;
    transition: background 480ms ease;
  }
  
  /* -------------------------------------------------------------------------
     1. Setup overlay (API key + model picker)
     ------------------------------------------------------------------------- */
  
  .cb-setup {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 36px 20px;
    min-height: 100%;
    background:
      radial-gradient(60vw 50vw at 105% -10%, var(--doc-primary-soft), transparent 55%),
      radial-gradient(45vw 40vw at -10% 110%, rgba(236, 72, 153, 0.10), transparent 55%);
  }
  
  .cb-setup[hidden] { display: none; }
  
  /* Chat root grows to fill the remaining space in `.cb-app`. */
  .cb-chat {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
  }
  .cb-chat[hidden] { display: none; }
  
  .cb-setup-card {
    width: 100%;
    max-width: 520px;
    background: var(--doc-surface);
    border: 1px solid var(--doc-border);
    border-radius: var(--doc-radius-lg);
    padding: 32px 30px 28px;
    box-shadow: var(--doc-shadow-lg);
    position: relative;
    overflow: hidden;
  }
  
  .cb-setup-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    background: var(--doc-gradient);
  }
  
  .cb-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--doc-primary);
    background: var(--doc-primary-soft);
    padding: 4px 10px;
    border-radius: var(--doc-radius-pill);
  }
  
  .cb-setup-card h1 {
    margin: 14px 0 8px;
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.02em;
  }
  
  .cb-lede {
    margin: 0 0 22px;
    color: var(--doc-text-muted);
    font-size: 14px;
    line-height: 1.6;
  }
  
  .cb-lede code {
    font-family: var(--doc-mono);
    font-size: 12.5px;
    background: var(--doc-code-bg-soft);
    color: var(--doc-text);
    padding: 1.5px 6px;
    border-radius: var(--doc-radius-xs);
    border: 1px solid var(--doc-border-subtle);
  }
  
  .cb-form { display: flex; flex-direction: column; gap: 16px; }
  
  .cb-field { display: flex; flex-direction: column; gap: 6px; }
  
  .cb-field label {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--doc-text);
  }
  
  .cb-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--doc-bg-soft);
    border: 1px solid var(--doc-border);
    border-radius: var(--doc-radius-md);
    transition: border-color var(--doc-transition), box-shadow var(--doc-transition);
  }
  
  .cb-input-wrap:focus-within {
    border-color: var(--doc-primary);
    box-shadow: var(--doc-focus-ring);
    background: var(--doc-surface);
  }
  
  .cb-input-icon {
    position: absolute;
    left: 12px;
    color: var(--doc-text-subtle);
    font-size: 13px;
    pointer-events: none;
  }
  
  .cb-input-wrap input {
    flex: 1;
    border: 0;
    background: transparent;
    font: inherit;
    font-size: 14px;
    color: var(--doc-text);
    padding: 10px 12px 10px 36px;
    border-radius: var(--doc-radius-md);
  }
  
  .cb-input-wrap input:focus { outline: none; }
  
  .cb-input-reveal {
    background: transparent;
    border: 0;
    color: var(--doc-text-subtle);
    padding: 8px 12px;
    cursor: pointer;
    font-size: 13px;
  }
  
  .cb-input-reveal:hover { color: var(--doc-text); }
  
  .cb-hint {
    font-size: 12px;
    color: var(--doc-text-muted);
    line-height: 1.5;
  }
  
  .cb-hint a { color: var(--doc-primary); font-weight: 500; }
  
  .cb-error {
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.28);
    color: #b91c1c;
    border-radius: var(--doc-radius-md);
    padding: 8px 12px;
    font-size: 12.5px;
  }
  :root[data-doc-theme="dark"] .cb-error { color: #fca5a5; }
  
  .cb-setup-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 6px;
  }
  
  .cb-perks {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px 14px;
    margin: 22px 0 0;
    padding: 0;
    list-style: none;
    font-size: 12.5px;
    color: var(--doc-text-muted);
  }
  
  .cb-perks li { display: inline-flex; align-items: center; gap: 8px; }
  .cb-perks i { color: var(--doc-success); font-size: 12px; }
  
  /* -------------------------------------------------------------------------
     2. Buttons (page-scoped — separate from site.css .btn)
     ------------------------------------------------------------------------- */
  
  .cb-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1px solid var(--doc-border);
    background: var(--doc-surface);
    color: var(--doc-text);
    font: inherit;
    font-size: 13px;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: var(--doc-radius-sm);
    cursor: pointer;
    transition: background var(--doc-transition), border-color var(--doc-transition),
                color var(--doc-transition), transform 100ms ease;
    text-decoration: none;
  }
  
  .cb-btn:hover { background: var(--doc-bg-soft); border-color: var(--doc-border-strong); }
  .cb-btn:active { transform: translateY(1px); }
  .cb-btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }
  
  .cb-btn--primary {
    background: var(--doc-primary);
    border-color: var(--doc-primary);
    color: #fff;
  }
  .cb-btn--primary:hover { background: var(--doc-primary-hover); border-color: var(--doc-primary-hover); color: #fff; }
  
  .cb-btn--ghost { background: transparent; }
  .cb-btn--ghost:hover { background: var(--doc-bg-soft); }
  
  .cb-iconbtn {
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: var(--doc-radius-sm);
    border: 1px solid var(--doc-border);
    background: var(--doc-surface);
    color: var(--doc-text-muted);
    cursor: pointer;
    font-size: 13px;
    transition: background var(--doc-transition), color var(--doc-transition), border-color var(--doc-transition);
  }
  .cb-iconbtn:hover { background: var(--doc-bg-soft); color: var(--doc-text); border-color: var(--doc-border-strong); }
  .cb-iconbtn:focus-visible { outline: 0; box-shadow: var(--doc-focus-ring); }
  .cb-iconbtn[hidden] { display: none; }
  
  .cb-stop { color: #b91c1c; border-color: rgba(239, 68, 68, 0.4); }
  .cb-stop:hover { background: rgba(239, 68, 68, 0.12); color: #b91c1c; }
  :root[data-doc-theme="dark"] .cb-stop { color: #fca5a5; }
  
  /* -------------------------------------------------------------------------
     3. Toolbar (mode tabs + theme/model controls)
     ------------------------------------------------------------------------- */
  
  .cb-toolbar {
    flex-shrink: 0;
    border-bottom: 1px solid var(--doc-border);
    background: var(--doc-surface);
    padding: 10px 18px 10px;
  }
  
  .cb-toolbar-row {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
  }
  
  .cb-toolbar-spacer { flex: 1; }
  
  .cb-modes {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 4px;
    background: var(--doc-bg-soft);
    border: 1px solid var(--doc-border);
    border-radius: var(--doc-radius-md);
  }
  
  .cb-mode {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    border: 0;
    padding: 7px 12px;
    border-radius: var(--doc-radius-sm);
    cursor: pointer;
    color: var(--doc-text-muted);
    font: inherit;
    font-size: 13px;
    font-weight: 500;
    transition: background var(--doc-transition), color var(--doc-transition), box-shadow var(--doc-transition);
  }
  
  .cb-mode i { font-size: 13px; }
  .cb-mode-label { display: inline-flex; align-items: baseline; gap: 4px; }
  .cb-mode-sub {
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--doc-text-subtle);
    text-transform: uppercase;
  }
  
  .cb-mode:hover { color: var(--doc-text); }
  
  .cb-mode[aria-selected="true"] {
    background: var(--doc-surface);
    color: var(--doc-text);
    font-weight: 600;
    box-shadow: var(--doc-shadow-sm);
    border: 1px solid var(--doc-border);
  }
  .cb-mode[aria-selected="true"] i { color: var(--doc-primary); }
  .cb-mode[aria-selected="true"] .cb-mode-sub { color: var(--doc-primary); }
  
  .cb-toolbar-controls {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
  }
  
  .cb-select-wrap {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--doc-bg-soft);
    border: 1px solid var(--doc-border);
    border-radius: var(--doc-radius-sm);
    padding: 0 10px 0 12px;
    color: var(--doc-text-muted);
  }
  .cb-select-wrap:hover { border-color: var(--doc-border-strong); }
  .cb-select-wrap i { font-size: 11.5px; }
  .cb-select-wrap select {
    appearance: none;
    border: 0;
    background: transparent;
    color: var(--doc-text);
    font: inherit;
    font-size: 12.5px;
    padding: 7px 20px 7px 4px;
    cursor: pointer;
    background-image: linear-gradient(45deg, transparent 50%, currentColor 50%),
                      linear-gradient(135deg, currentColor 50%, transparent 50%);
    background-position: calc(100% - 10px) 14px, calc(100% - 6px) 14px;
    background-size: 4px 4px;
    background-repeat: no-repeat;
  }
  .cb-select-wrap select:focus { outline: 0; }
  
  /* -------------------------------------------------------------------------
     4. Chat stage (welcome + history)
     ------------------------------------------------------------------------- */
  
  .cb-stage {
    flex: 1;
    overflow-y: auto;
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--doc-border-strong) transparent;
  }
  .cb-stage::-webkit-scrollbar { width: 6px; }
  .cb-stage::-webkit-scrollbar-thumb { background: var(--doc-border-strong); border-radius: 3px; }
  
  .cb-welcome {
    max-width: 760px;
    margin: 0 auto;
    padding: 48px 24px 24px;
    text-align: center;
    animation: cb-fade 320ms ease;
  }
  
  .cb-welcome[hidden] { display: none; }
  
  .cb-welcome-mark {
    display: inline-grid;
    place-items: center;
    width: 56px;
    height: 56px;
    margin-bottom: 14px;
    border-radius: 16px;
    background: var(--doc-gradient);
    color: #fff;
    font-size: 22px;
    box-shadow: 0 12px 30px rgba(99, 102, 241, 0.30);
  }
  
  .cb-welcome h2 {
    margin: 0 0 8px;
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.02em;
  }
  
  .cb-welcome p {
    margin: 0 0 22px;
    color: var(--doc-text-muted);
    font-size: 15px;
    line-height: 1.6;
    max-width: 580px;
    margin-inline: auto;
  }
  
  .cb-suggestions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 10px;
    margin: 0 auto;
    max-width: 720px;
  }
  
  .cb-suggestion {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 14px 16px;
    border-radius: var(--doc-radius-md);
    background: var(--doc-surface);
    border: 1px solid var(--doc-border);
    text-align: left;
    cursor: pointer;
    font: inherit;
    color: var(--doc-text);
    transition: border-color var(--doc-transition), background var(--doc-transition), transform 120ms ease;
  }
  
  .cb-suggestion:hover {
    border-color: var(--doc-primary);
    background: var(--doc-primary-softer);
    transform: translateY(-1px);
  }
  
  .cb-suggestion-title {
    font-size: 13.5px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
  }
  .cb-suggestion-title i { color: var(--doc-primary); }
  
  .cb-suggestion-desc {
    font-size: 12px;
    color: var(--doc-text-muted);
    line-height: 1.45;
  }
  
  .cb-history {
    max-width: 1200px;
    margin: 0 auto;
    padding: 18px 24px 24px;
    display: flex;
    flex-direction: column;
    gap: 22px;
  }
  
  .cb-history:empty { display: none; }
  
  /* -------------------------------------------------------------------------
     5. Chat messages
     ------------------------------------------------------------------------- */
  
  .cb-msg {
    display: flex;
    flex-direction: column;
    gap: 8px;
    animation: cb-fade 240ms ease;
  }
  
  .cb-msg-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    font-size: 11.5px;
    color: var(--doc-text-muted);
  }
  
  .cb-role {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--doc-text);
  }
  
  .cb-role i { color: var(--doc-primary); }
  
  .cb-mode-pill {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--doc-primary-soft);
    color: var(--doc-primary);
    font-weight: 600;
    font-size: 10.5px;
    letter-spacing: 0.04em;
  }
  
  .cb-msg-time {
    margin-left: auto;
    font-size: 11px;
    color: var(--doc-text-subtle);
  }
  
  /* User messages */
  .cb-msg--user {
    align-self: flex-end;
    max-width: 80%;
  }
  .cb-msg--user .cb-msg-meta { justify-content: flex-end; }
  .cb-msg--user .cb-bubble {
    background: var(--doc-gradient);
    color: #fff;
    padding: 12px 16px;
    border-radius: 16px 16px 4px 16px;
    font-size: 14.5px;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
    box-shadow: 0 8px 22px rgba(99, 102, 241, 0.20);
  }
  
  /* Assistant messages */
  .cb-msg--assistant { align-self: stretch; }
  
  .cb-msg-card {
    border: 1px solid var(--doc-border);
    border-radius: var(--doc-radius-md);
    background: var(--doc-surface);
    overflow: hidden;
    box-shadow: var(--doc-shadow-sm);
  }
  
  .cb-msg-tabs {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 10px;
    border-bottom: 1px solid var(--doc-border);
    background: var(--doc-bg-soft);
  }
  
  .cb-msg-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 0;
    background: transparent;
    color: var(--doc-text-muted);
    font: inherit;
    font-size: 12.5px;
    font-weight: 500;
    padding: 5px 12px;
    border-radius: var(--doc-radius-xs);
    cursor: pointer;
    transition: background var(--doc-transition), color var(--doc-transition);
  }
  .cb-msg-tab:hover { color: var(--doc-text); background: var(--doc-surface); }
  .cb-msg-tab[aria-selected="true"] {
    color: var(--doc-text);
    background: var(--doc-surface);
    font-weight: 600;
    box-shadow: var(--doc-shadow-sm);
  }
  .cb-msg-tab i { font-size: 11px; }
  
  .cb-msg-tabs-spacer { flex: 1; }
  
  .cb-msg-tabs .cb-status {
    font-size: 11px;
    color: var(--doc-text-subtle);
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }
  .cb-msg-tabs .cb-status i { color: var(--doc-text-subtle); }
  .cb-msg-tabs .cb-status[data-tone="streaming"] i { color: var(--doc-primary); animation: cb-pulse 1.1s infinite ease-in-out; }
  .cb-msg-tabs .cb-status[data-tone="done"] i { color: var(--doc-success); }
  
  .cb-msg-body { position: relative; }
  
  .cb-msg-panel { display: none; }
  .cb-msg-panel[data-active="true"] { display: block; }
  
  .cb-msg-preview {
    padding: 16px;
    min-height: 80px;
    background: var(--doc-bg);
  }
  
  .cb-msg-preview aktion-app {
    display: block;
    width: 100%;
  }
  
  .cb-msg-source {
    background: var(--doc-code-bg);
    color: var(--doc-code-fg);
    position: relative;
    max-height: 520px;
    overflow: auto;
  }
  
  .cb-msg-source pre {
    margin: 0;
    padding: 16px 18px 18px 18px;
    background: transparent;
    border: 0;
    border-radius: 0;
    font-family: var(--doc-mono);
    font-size: 12.5px;
    line-height: 1.6;
    color: inherit;
    white-space: pre-wrap;
    word-break: break-word;
    box-shadow: none;
  }
  
  .cb-msg-actions {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 12px;
    border-top: 1px solid var(--doc-border);
    background: var(--doc-bg-soft);
    flex-wrap: wrap;
  }
  
  .cb-msg-actions .cb-msg-actions-spacer { flex: 1; }
  
  .cb-act {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--doc-text-muted);
    font: inherit;
    font-size: 12px;
    font-weight: 500;
    padding: 5px 10px;
    border-radius: var(--doc-radius-xs);
    cursor: pointer;
    transition: background var(--doc-transition), color var(--doc-transition), border-color var(--doc-transition);
  }
  .cb-act:hover { color: var(--doc-text); background: var(--doc-surface); border-color: var(--doc-border); }
  .cb-act:focus-visible { outline: 0; box-shadow: var(--doc-focus-ring); }
  .cb-act[data-state="copied"] { color: var(--doc-success); border-color: rgba(16, 185, 129, 0.30); }
  .cb-act i { font-size: 11.5px; }
  
  .cb-msg-err {
    margin: 0 12px 12px;
    padding: 10px 12px;
    border-radius: var(--doc-radius-sm);
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.30);
    color: #b91c1c;
    font-size: 13px;
  }
  :root[data-doc-theme="dark"] .cb-msg-err { color: #fca5a5; }
  
  /* -------------------------------------------------------------------------
     6. Composer
     ------------------------------------------------------------------------- */
  
  .cb-composer {
    flex-shrink: 0;
    border-top: 1px solid var(--doc-border);
    background: var(--doc-surface);
    padding: 12px 18px;
    padding-bottom: max(12px, env(safe-area-inset-bottom));
  }
  
  .cb-composer-inner {
    max-width: 980px;
    margin: 0 auto;
    background: var(--doc-bg-soft);
    border: 1px solid var(--doc-border);
    border-radius: var(--doc-radius-lg);
    padding: 8px 8px 8px 14px;
    transition: border-color var(--doc-transition), box-shadow var(--doc-transition);
  }
  
  .cb-composer-inner:focus-within {
    border-color: var(--doc-primary);
    box-shadow: var(--doc-focus-ring);
  }

  .cb-composer-inner.cb-drop-target {
    border-color: var(--doc-primary);
    background: color-mix(in srgb, var(--doc-primary) 7%, var(--doc-bg-soft));
  }
  
  .cb-composer textarea {
    width: 100%;
    border: 0;
    background: transparent;
    font: inherit;
    font-size: 15px;
    color: var(--doc-text);
    resize: none;
    min-height: 28px;
    max-height: 200px;
    line-height: 1.5;
    padding: 8px 0 4px;
  }
  
  .cb-composer textarea::placeholder { color: var(--doc-text-subtle); }
  .cb-composer textarea:focus { outline: none; }
  
  .cb-composer-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 4px;
  }
  
  .cb-composer-hint {
    flex: 1;
    font-size: 11px;
    color: var(--doc-text-subtle);
  }
  .cb-composer-hint kbd {
    font-family: var(--doc-mono);
    font-size: 10.5px;
    background: var(--doc-surface);
    border: 1px solid var(--doc-border);
    padding: 1px 5px;
    border-radius: 4px;
    color: var(--doc-text-muted);
  }
  
  .cb-send {
    padding: 7px 14px;
    font-size: 13px;
  }
  .cb-send i { font-size: 12.5px; }
  
  /* When streaming: hide labels on phones to give the stop button room */
  @media (max-width: 520px) {
    .cb-send span { display: none; }
  }

  /* ---- Attachments (composer) ---- */

  .cb-attach {
    /* paperclip button — same shape as .cb-iconbtn but explicitly themed */
    color: var(--doc-text-muted);
  }
  .cb-attach:hover { color: var(--doc-text); }
  .cb-attach[data-active="true"] {
    color: var(--doc-primary);
    background: color-mix(in srgb, var(--doc-primary) 12%, transparent);
  }

  .cb-attach-row {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 4px 0 8px 0;
  }
  .cb-attach-row[hidden] { display: none; }

  .cb-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 4px 6px 4px 10px;
    background: var(--doc-surface);
    border: 1px solid var(--doc-border);
    border-radius: 999px;
    font-size: 12px;
    color: var(--doc-text);
    max-width: 100%;
  }
  .cb-chip-thumb {
    width: 22px;
    height: 22px;
    border-radius: 4px;
    object-fit: cover;
    background: var(--doc-bg-soft);
    flex-shrink: 0;
  }
  .cb-chip-icon {
    width: 22px;
    height: 22px;
    border-radius: 4px;
    background: var(--doc-bg-soft);
    color: var(--doc-text-muted);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }
  .cb-chip-icon i { font-size: 11px; }
  .cb-chip-meta {
    display: inline-flex;
    flex-direction: column;
    line-height: 1.15;
    min-width: 0;
  }
  .cb-chip-name {
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 180px;
  }
  .cb-chip-size {
    font-size: 10.5px;
    color: var(--doc-text-subtle);
  }
  .cb-chip-remove {
    border: 0;
    background: transparent;
    color: var(--doc-text-subtle);
    width: 22px;
    height: 22px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--doc-transition), color var(--doc-transition);
    margin-left: 2px;
  }
  .cb-chip-remove:hover {
    background: color-mix(in srgb, var(--doc-text) 10%, transparent);
    color: var(--doc-text);
  }
  .cb-chip-remove i { font-size: 10.5px; }

  /* ---- User attachments row (rendered above a user message) ---- */

  .cb-user-attachments {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 6px;
  }
  .cb-user-attachment {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: color-mix(in srgb, var(--doc-primary) 10%, transparent);
    border: 1px solid color-mix(in srgb, var(--doc-primary) 22%, transparent);
    border-radius: 999px;
    color: var(--doc-text);
    font-size: 11.5px;
    line-height: 1.2;
    max-width: 240px;
  }
  .cb-user-attachment img {
    width: 26px;
    height: 26px;
    border-radius: 4px;
    object-fit: cover;
    margin: -2px -4px -2px -6px;
  }
  .cb-user-attachment i { font-size: 11px; color: var(--doc-text-muted); }
  .cb-user-attachment span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  
  /* -------------------------------------------------------------------------
     7. Settings drawer
     ------------------------------------------------------------------------- */
  
  .cb-drawer-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(2px);
    z-index: 80;
    opacity: 0;
    pointer-events: none;
    transition: opacity 200ms ease;
  }
  .cb-drawer-backdrop[data-open="true"] {
    opacity: 1;
    pointer-events: auto;
  }
  
  .cb-drawer {
    position: fixed;
    top: var(--doc-topbar-h);
    right: 0;
    bottom: 0;
    width: min(420px, 100vw);
    background: var(--doc-surface);
    border-left: 1px solid var(--doc-border);
    box-shadow: var(--doc-shadow-lg);
    z-index: 81;
    transform: translateX(100%);
    transition: transform 240ms cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
  }
  .cb-drawer[data-open="true"] { transform: translateX(0); }
  
  .cb-drawer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--doc-border);
  }
  .cb-drawer-head h2 {
    margin: 0;
    font-size: 16px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 10px;
  }
  .cb-drawer-head h2 i { color: var(--doc-primary); }
  
  .cb-drawer-body {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 18px;
  }
  
  .cb-drawer-body input[type="text"],
  .cb-drawer-body input[type="password"] {
    width: 100%;
    border: 1px solid var(--doc-border);
    border-radius: var(--doc-radius-md);
    background: var(--doc-bg-soft);
    font: inherit;
    font-size: 14px;
    padding: 9px 12px;
    color: var(--doc-text);
  }
  .cb-drawer-body input[type="text"]:focus,
  .cb-drawer-body input[type="password"]:focus {
    outline: none;
    border-color: var(--doc-primary);
    box-shadow: var(--doc-focus-ring);
    background: var(--doc-surface);
  }
  
  .cb-drawer-body input[type="range"] {
    width: 100%;
    accent-color: var(--doc-primary);
  }
  
  .cb-history-readout {
    margin-left: auto;
    font-size: 11.5px;
    color: var(--doc-text-muted);
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
  }
  
  .cb-drawer-body label {
    display: flex;
    align-items: center;
    font-size: 12.5px;
    font-weight: 600;
  }
  
  .cb-drawer-row {
    display: flex;
    gap: 10px;
    margin-top: auto;
    flex-wrap: wrap;
  }
  
  .cb-drawer-row .cb-btn { flex: 1; min-width: 140px; }
  
  /* -------------------------------------------------------------------------
     8. Toast
     ------------------------------------------------------------------------- */
  
  .cb-toast {
    position: fixed;
    bottom: 22px;
    left: 50%;
    transform: translate(-50%, 8px);
    z-index: 90;
    background: var(--doc-text);
    color: var(--doc-text-inverse);
    padding: 9px 14px;
    border-radius: var(--doc-radius-md);
    box-shadow: var(--doc-shadow-lg);
    font-size: 13px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 200ms ease, transform 200ms ease;
  }
  .cb-toast[data-visible="true"] {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, 0);
  }
  
  /* -------------------------------------------------------------------------
     9. Animations
     ------------------------------------------------------------------------- */
  
  @keyframes cb-fade {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
  }
  
  @keyframes cb-pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
  }
  
  /* -------------------------------------------------------------------------
     10. Responsive
     ------------------------------------------------------------------------- */
  
  @media (max-width: 900px) {
    .cb-toolbar { padding: 8px 12px 0; }
    .cb-mode { padding: 6px 9px; font-size: 12.5px; }
    .cb-mode-sub { display: none; }
    .cb-history { padding: 14px 14px 18px; }
    .cb-welcome { padding: 32px 16px 16px; }
    .cb-welcome h2 { font-size: 22px; }
    .cb-msg-actions { padding: 8px; }
    .cb-act { font-size: 11.5px; padding: 4px 8px; }
    .cb-composer { padding: 10px 12px; }
  }
  
  @media (max-width: 640px) {
    .cb-app { height: calc(100vh - var(--doc-topbar-h)); }
    .cb-modes { width: 100%; flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
    .cb-modes::-webkit-scrollbar { display: none; }
    .cb-mode { white-space: nowrap; flex-shrink: 0; }
    .cb-toolbar-controls { width: 100%; justify-content: flex-end; }
    .cb-select-wrap select { max-width: 130px; }
    .cb-msg--user { max-width: 92%; }
    .cb-msg-preview { padding: 12px; }
    .cb-msg-source pre { font-size: 12px; padding: 12px; }
    .cb-setup { padding: 18px 14px; }
    .cb-setup-card { padding: 24px 20px 22px; }
    .cb-setup-card h1 { font-size: 22px; }
    .cb-setup-actions { flex-direction: column-reverse; align-items: stretch; }
    .cb-perks { grid-template-columns: 1fr; }
  }
  
  @media (max-width: 420px) {
    .cb-toolbar { padding: 6px 8px 0; }
    .cb-toolbar-row { gap: 8px; }
    .cb-mode { padding: 5px 8px; font-size: 12px; gap: 6px; }
    .cb-msg-meta { font-size: 11px; }
  }
  
  /* =============================================================================
     11. Rich enhancements — welcome aurora, gradient cards, animated streaming,
         viewport toggle, fullscreen preview, and a more lively response box.
     ============================================================================= */
  
  /* --- Welcome screen: aurora background + animated header --------------- */
  
  .cb-welcome { position: relative; padding-top: 64px; }
  
  .cb-aurora {
    position: absolute;
    inset: -40px -20px 40% -20px;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
    filter: blur(60px);
    opacity: 0.55;
  }
  .cb-aurora-blob {
    position: absolute;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    mix-blend-mode: screen;
    animation: cb-float 14s ease-in-out infinite;
    will-change: transform;
  }
  .cb-aurora-blob--a { background: radial-gradient(circle, var(--cb-accent-1), transparent 65%); top: -120px; left: 8%; }
  .cb-aurora-blob--b { background: radial-gradient(circle, var(--cb-accent-2), transparent 65%); top: -60px; right: 8%; animation-delay: -4s; }
  .cb-aurora-blob--c { background: radial-gradient(circle, var(--cb-accent-3), transparent 65%); top: 60px; left: 38%; animation-delay: -8s; }
  :root[data-doc-theme="dark"] .cb-aurora { opacity: 0.42; }
  
  @keyframes cb-float {
    0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
    33%      { transform: translate3d(40px, 30px, 0) scale(1.08); }
    66%      { transform: translate3d(-30px, 20px, 0) scale(0.94); }
  }
  
  .cb-welcome-mark {
    position: relative;
    background: var(--cb-accent-grad);
    background-size: 200% 200%;
    animation: cb-grad-shift 6s ease infinite;
    box-shadow: var(--cb-glow);
  }
  .cb-welcome-mark::after {
    content: "";
    position: absolute;
    inset: -6px;
    border-radius: 22px;
    background: var(--cb-accent-grad);
    opacity: 0.45;
    filter: blur(18px);
    z-index: -1;
    animation: cb-pulse-soft 3.4s ease-in-out infinite;
  }
  
  @keyframes cb-grad-shift {
    0%, 100% { background-position: 0% 50%; }
    50%      { background-position: 100% 50%; }
  }
  @keyframes cb-pulse-soft {
    0%, 100% { opacity: 0.30; transform: scale(0.96); }
    50%      { opacity: 0.55; transform: scale(1.06); }
  }
  
  .cb-welcome-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 4px 0 14px;
    padding: 5px 12px;
    border-radius: var(--doc-radius-pill);
    background: color-mix(in srgb, var(--cb-accent-2) 10%, transparent);
    border: 1px solid color-mix(in srgb, var(--cb-accent-2) 26%, transparent);
    color: color-mix(in srgb, var(--cb-accent-2) 80%, var(--doc-text));
    font-size: 11.5px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }
  .cb-pulse-dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--cb-accent-2);
    box-shadow: 0 0 0 0 color-mix(in srgb, var(--cb-accent-2) 60%, transparent);
    animation: cb-ring 1.6s ease-out infinite;
  }
  @keyframes cb-ring {
    0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--cb-accent-2) 50%, transparent); }
    100% { box-shadow: 0 0 0 12px transparent; }
  }
  
  .cb-grad-text {
    background: var(--cb-accent-grad);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: cb-grad-shift 5s ease infinite;
  }
  
  .cb-welcome-stats {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin: 0 auto 26px;
    max-width: 640px;
  }
  .cb-stat {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 11px;
    border-radius: var(--doc-radius-pill);
    background: var(--doc-surface);
    border: 1px solid var(--doc-border);
    color: var(--doc-text-muted);
    font-size: 11.5px;
    font-weight: 500;
    box-shadow: var(--doc-shadow-sm);
    transition: transform 200ms ease, color 200ms ease, border-color 200ms ease;
  }
  .cb-stat:hover { transform: translateY(-1px); color: var(--doc-text); border-color: var(--doc-border-strong); }
  .cb-stat i {
    background: var(--cb-accent-grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-size: 11px;
  }
  
  /* --- Suggestion cards: gradient hover sheen ---------------------------- */
  
  .cb-suggestion {
    position: relative;
    overflow: hidden;
    isolation: isolate;
  }
  .cb-suggestion::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--cb-accent-grad-soft);
    opacity: 0;
    transition: opacity 200ms ease;
    z-index: -1;
  }
  .cb-suggestion::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: 0;
    height: 2px;
    background: var(--cb-accent-grad);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 240ms ease;
  }
  .cb-suggestion:hover::before { opacity: 1; }
  .cb-suggestion:hover::after  { transform: scaleX(1); }
  .cb-suggestion:hover {
    border-color: color-mix(in srgb, var(--cb-accent-2) 40%, var(--doc-border));
    box-shadow: 0 14px 28px -16px color-mix(in srgb, var(--cb-accent-2) 50%, transparent);
  }
  .cb-suggestion-title i {
    background: var(--cb-accent-grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  
  /* --- Mode tabs: animated underline indicator --------------------------- */
  
  .cb-mode { position: relative; }
  .cb-mode[aria-selected="true"] {
    background: var(--doc-surface);
    background-image: linear-gradient(180deg, transparent, color-mix(in srgb, var(--cb-accent-2) 8%, transparent));
  }

  .cb-mode[aria-selected="true"] i,
  .cb-mode[aria-selected="true"] .cb-mode-sub {
    background: var(--cb-accent-grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  
  /* --- USER MESSAGE: gradient bubble keyed to mode ---------------------- */
  
  .cb-msg--user .cb-bubble {
    background: var(--cb-accent-grad);
    background-size: 180% 180%;
    animation: cb-grad-shift 8s ease infinite;
    box-shadow: 0 10px 28px -8px color-mix(in srgb, var(--cb-accent-2) 50%, transparent);
  }
  
  /* --- ASSISTANT CARD: the rich response preview box -------------------- */
  
  .cb-msg-card {
    position: relative;
    border: 1px solid color-mix(in srgb, var(--cb-accent-2) 18%, var(--doc-border));
    background:
      linear-gradient(var(--doc-surface), var(--doc-surface)) padding-box,
      var(--cb-accent-grad) border-box;
    box-shadow:
      var(--doc-shadow),
      0 30px 80px -40px color-mix(in srgb, var(--cb-accent-2) 60%, transparent);
    transition: transform 200ms ease, box-shadow 240ms ease, border-color 200ms ease;
    border-radius: var(--doc-radius-lg);
  }
  .cb-msg-card::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    border-top-left-radius: inherit;
    border-top-right-radius: inherit;
    background: var(--cb-accent-grad);
    background-size: 200% 200%;
    animation: cb-grad-shift 5s ease infinite;
    pointer-events: none;
  }
  .cb-msg-card:hover {
    transform: translateY(-1px);
    box-shadow:
      var(--doc-shadow-lg),
      0 40px 90px -40px color-mix(in srgb, var(--cb-accent-2) 70%, transparent);
  }
  
  /* Streaming-state shimmer that runs across the card while tokens arrive. */
  .cb-msg-card[data-streaming="true"]::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(
      100deg,
      transparent 30%,
      color-mix(in srgb, var(--cb-accent-2) 12%, transparent) 50%,
      transparent 70%
    );
    background-size: 250% 100%;
    pointer-events: none;
    animation: cb-shimmer 2.4s linear infinite;
    mix-blend-mode: overlay;
  }
  @keyframes cb-shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -100% 0; }
  }
  
  /* Mode pill in the meta row gets the gradient too. */
  .cb-mode-pill {
    background: var(--cb-accent-grad);
    color: #fff !important;
    border: 0;
    box-shadow: 0 4px 12px -4px color-mix(in srgb, var(--cb-accent-2) 70%, transparent);
  }
  .cb-msg--assistant .cb-role i {
    background: var(--cb-accent-grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  
  /* Tabs row gets a subtle gradient wash + animated indicator. */
  .cb-msg-tabs {
    background: linear-gradient(180deg,
      color-mix(in srgb, var(--cb-accent-1) 6%, var(--doc-bg-soft)),
      var(--doc-bg-soft));
    position: relative;
  }
  .cb-msg-tab[aria-selected="true"] {
    background: var(--doc-surface);
    background-image: linear-gradient(180deg, color-mix(in srgb, var(--cb-accent-2) 8%, transparent), transparent);
    box-shadow: 0 1px 0 color-mix(in srgb, var(--cb-accent-2) 30%, transparent),
                var(--doc-shadow-sm);
  }
  .cb-msg-tab[aria-selected="true"] i {
    background: var(--cb-accent-grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  
  /* Status pill in tabs row: animated dot with mode color. */
  .cb-msg-tabs .cb-status {
    padding: 3px 10px;
    border-radius: var(--doc-radius-pill);
    background: var(--doc-surface);
    border: 1px solid var(--doc-border);
    font-weight: 600;
    font-size: 11px;
  }
  .cb-msg-tabs .cb-status[data-tone="streaming"] {
    border-color: color-mix(in srgb, var(--cb-accent-2) 40%, transparent);
    color: color-mix(in srgb, var(--cb-accent-2) 70%, var(--doc-text));
    background: color-mix(in srgb, var(--cb-accent-2) 8%, var(--doc-surface));
  }
  .cb-msg-tabs .cb-status[data-tone="done"] {
    border-color: color-mix(in srgb, var(--doc-success) 40%, transparent);
    background: color-mix(in srgb, var(--doc-success) 10%, var(--doc-surface));
    color: var(--doc-success);
  }
  
  /* Viewport toolbar inside preview --------------------------------- */
  
  .cb-viewport-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: linear-gradient(180deg,
      color-mix(in srgb, var(--cb-accent-2) 4%, var(--doc-surface)),
      var(--doc-surface));
    border-bottom: 1px dashed var(--doc-border);
    flex-wrap: wrap;
  }
  .cb-vp-group {
    display: inline-flex;
    background: var(--doc-bg-soft);
    border: 1px solid var(--doc-border);
    border-radius: var(--doc-radius-pill);
    padding: 3px;
  }
  .cb-vp-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border: 0;
    background: transparent;
    color: var(--doc-text-muted);
    font: inherit;
    font-size: 11.5px;
    font-weight: 600;
    padding: 5px 11px;
    border-radius: var(--doc-radius-pill);
    cursor: pointer;
    transition: background 180ms ease, color 180ms ease, transform 100ms ease;
  }
  .cb-vp-btn:hover { color: var(--doc-text); }
  .cb-vp-btn[aria-pressed="true"] {
    background: var(--cb-accent-grad);
    color: #fff;
    box-shadow: 0 4px 12px -4px color-mix(in srgb, var(--cb-accent-2) 70%, transparent);
  }
  .cb-vp-btn:active { transform: scale(0.96); }
  
  .cb-viewport-info {
    margin-left: auto;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 11px;
    color: var(--doc-text-subtle);
  }
  .cb-viewport-info b {
    font-weight: 600;
    color: var(--doc-text-muted);
    font-variant-numeric: tabular-nums;
  }
  
  /* The preview canvas now hosts a "device frame" for tablet/mobile. */
  .cb-msg-preview {
    background:
      repeating-linear-gradient(45deg,
        color-mix(in srgb, var(--cb-accent-2) 3%, transparent) 0 1px,
        transparent 1px 14px),
      var(--doc-bg);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    transition: background 240ms ease;
  }
  .cb-msg-preview-frame {
    width: 100%;
    max-width: 100%;
    background: var(--doc-surface);
    border-radius: var(--doc-radius-md);
    box-shadow: 0 6px 24px -10px rgba(0, 0, 0, 0.18);
    overflow: hidden;
    transition: max-width 320ms cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 240ms ease;
  }
  .cb-msg-preview[data-vp="mobile"]  .cb-msg-preview-frame { max-width: 390px; box-shadow: 0 10px 40px -12px rgba(0,0,0,0.25); }
  .cb-msg-preview[data-vp="tablet"]  .cb-msg-preview-frame { max-width: 768px; box-shadow: 0 10px 40px -12px rgba(0,0,0,0.22); }
  .cb-msg-preview[data-vp="desktop"] .cb-msg-preview-frame { max-width: 100%; box-shadow: none; }
  .cb-msg-preview[data-vp="desktop"] {
    background:
      repeating-linear-gradient(45deg,
        color-mix(in srgb, var(--cb-accent-2) 3%, transparent) 0 1px,
        transparent 1px 14px),
      var(--doc-bg);
  }
  
  /* Skeleton placeholder shown until the first token arrives. */
  .cb-msg-skeleton {
    display: grid;
    gap: 12px;
    padding: 22px;
    width: 100%;
  }
  .cb-msg-skeleton span {
    display: block;
    height: 14px;
    border-radius: 8px;
    background: linear-gradient(90deg,
      var(--doc-bg-soft) 0%,
      color-mix(in srgb, var(--cb-accent-2) 14%, var(--doc-bg-soft)) 50%,
      var(--doc-bg-soft) 100%);
    background-size: 200% 100%;
    animation: cb-skele 1.4s ease-in-out infinite;
  }
  .cb-msg-skeleton span:nth-child(1) { width: 35%; height: 22px; }
  .cb-msg-skeleton span:nth-child(2) { width: 90%; }
  .cb-msg-skeleton span:nth-child(3) { width: 75%; }
  .cb-msg-skeleton span:nth-child(4) { width: 60%; height: 60px; }
  .cb-msg-skeleton span:nth-child(5) { width: 80%; }
  @keyframes cb-skele {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
  }
  
  /* Source view: line counter + animated caret ---------------------- */
  .cb-msg-source {
    background:
      linear-gradient(180deg,
        color-mix(in srgb, var(--cb-accent-2) 6%, var(--doc-code-bg)),
        var(--doc-code-bg));
  }
  .cb-msg-source pre {
    counter-reset: cb-line;
  }
  .cb-msg-source pre code {
    font-family: var(--doc-mono);
  }
  .cb-msg-card[data-streaming="true"] .cb-msg-source pre code::after {
    content: "▍";
    display: inline-block;
    margin-left: 1px;
    color: var(--cb-accent-2);
    animation: cb-blink 0.9s steps(1) infinite;
  }
  @keyframes cb-blink { 50% { opacity: 0; } }
  
  /* Action bar: gradient regenerate button + better hover ----------- */
  
  .cb-msg-actions { gap: 4px; }
  .cb-act { transition: background 160ms ease, color 160ms ease, border-color 160ms ease, transform 100ms ease; }
  .cb-act:hover { transform: translateY(-1px); }
  .cb-act[data-act="regenerate"] {
    background: var(--cb-accent-grad);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 6px 16px -6px color-mix(in srgb, var(--cb-accent-2) 65%, transparent);
  }
  .cb-act[data-act="regenerate"]:hover {
    filter: brightness(1.06);
    box-shadow: 0 10px 22px -6px color-mix(in srgb, var(--cb-accent-2) 75%, transparent);
  }
  .cb-act[data-act="regenerate"] i { animation: cb-rot 0; }
  .cb-act[data-act="regenerate"]:hover i { animation: cb-rot 0.8s ease; }
  @keyframes cb-rot { from { transform: rotate(0); } to { transform: rotate(360deg); } }
  
  .cb-act[data-act="fullscreen"] i,
  .cb-act[data-act="share"] i { color: var(--cb-accent-2); }
  
  .cb-msg-meta-stats {
    margin-left: 8px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 11px;
    color: var(--doc-text-subtle);
    font-variant-numeric: tabular-nums;
  }
  .cb-msg-meta-stats b {
    color: var(--doc-text-muted);
    font-weight: 600;
  }
  
  /* Fullscreen preview overlay ------------------------------------- */
  .cb-fullscreen {
    position: fixed;
    inset: 0;
    z-index: 95;
    background: var(--doc-bg);
    display: none;
    flex-direction: column;
    animation: cb-fade 180ms ease;
  }
  .cb-fullscreen[data-open="true"] { display: flex; }
  .cb-fullscreen-head {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--doc-border);
    background: linear-gradient(90deg,
      color-mix(in srgb, var(--cb-accent-1) 8%, var(--doc-surface)),
      color-mix(in srgb, var(--cb-accent-3) 8%, var(--doc-surface)));
  }
  .cb-fullscreen-head h3 {
    margin: 0;
    font-size: 14px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 8px;
  }
  .cb-fullscreen-head h3 i {
    background: var(--cb-accent-grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  .cb-fullscreen-head .cb-toolbar-spacer { flex: 1; }
  .cb-fullscreen-body {
    flex: 1;
    overflow: auto;
    padding: 24px;
    background: var(--doc-bg);
  }
  .cb-fullscreen-body aktion-app { display: block; max-width: 100%; margin: 0 auto; }
  
  /* Composer: gradient ring on focus, send button glow -------------- */
  
  .cb-composer { position: relative; }
  .cb-composer::before {
    content: "";
    position: absolute;
    left: 0; right: 0; top: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--cb-accent-2) 40%, transparent), transparent);
  }
  .cb-composer-inner {
    background:
      linear-gradient(var(--doc-bg-soft), var(--doc-bg-soft)) padding-box,
      linear-gradient(135deg, var(--doc-border), var(--doc-border)) border-box;
    border-color: transparent;
    transition: background-image 240ms ease, box-shadow 240ms ease;
  }
  .cb-composer-inner:focus-within {
    background:
      linear-gradient(white, var(--doc-bg-soft)) padding-box,
      var(--cb-accent-grad) border-box;
    box-shadow: 0 14px 32px -16px color-mix(in srgb, var(--cb-accent-2) 60%, transparent);
  }
  .cb-send {
    background: var(--cb-accent-grad);
    background-size: 180% 180%;
    border-color: transparent;
    box-shadow: 0 8px 20px -8px color-mix(in srgb, var(--cb-accent-2) 70%, transparent);
    animation: cb-grad-shift 8s ease infinite;
  }
  .cb-send:hover { filter: brightness(1.08); }
  .cb-send:disabled {
    filter: grayscale(0.4) brightness(0.95);
    animation: none;
  }
  
  /* Char counter in composer */
  .cb-composer-count {
    font-size: 10.5px;
    color: var(--doc-text-subtle);
    font-variant-numeric: tabular-nums;
    margin-right: 4px;
  }
  .cb-composer-count[data-tone="warn"] { color: var(--doc-warning); }
  
  /* Toolbar: surface gets a faint gradient line under it ------------ */
  
  .cb-toolbar {
    background: linear-gradient(180deg,
      color-mix(in srgb, var(--cb-accent-1) 4%, var(--doc-surface)),
      var(--doc-surface));
    position: relative;
  }
  .cb-toolbar::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: -1px;
    height: 1px;
    background: linear-gradient(90deg,
      transparent,
      color-mix(in srgb, var(--cb-accent-2) 35%, transparent),
      transparent);
  }
  
  /* New chat & settings icon-buttons get a subtle accent on hover. */
  .cb-iconbtn:hover {
    border-color: color-mix(in srgb, var(--cb-accent-2) 35%, var(--doc-border));
    color: var(--cb-accent-2);
  }
  
  /* Setup card upgrade --------------------------------------------- */
  .cb-setup {
    background:
      radial-gradient(60vw 50vh at 105% -10%, color-mix(in srgb, var(--cb-accent-1) 18%, transparent), transparent 55%),
      radial-gradient(45vw 40vh at -10% 110%, color-mix(in srgb, var(--cb-accent-3) 16%, transparent), transparent 55%),
      var(--doc-bg);
  }
  .cb-setup-card {
    background:
      linear-gradient(var(--doc-surface), var(--doc-surface)) padding-box,
      var(--cb-accent-grad) border-box;
    border: 1px solid transparent;
  }
  .cb-setup-card::before {
    background: var(--cb-accent-grad);
    background-size: 200% 200%;
    animation: cb-grad-shift 5s ease infinite;
  }
  .cb-eyebrow {
    background: var(--cb-accent-grad);
    color: #fff;
    box-shadow: 0 4px 12px -4px color-mix(in srgb, var(--cb-accent-2) 70%, transparent);
  }
  .cb-perks i {
    background: var(--cb-accent-grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  
  /* Reduced motion: kill the heavy animations. */
  @media (prefers-reduced-motion: reduce) {
    .cb-aurora-blob,
    .cb-welcome-mark,
    .cb-welcome-mark::after,
    .cb-grad-text,
    .cb-pulse-dot,
    .cb-msg-card::before,
    .cb-msg-card[data-streaming="true"]::after,
    .cb-msg-skeleton span,
    .cb-msg--user .cb-bubble,
    .cb-send {
      animation: none !important;
    }
  }
  
  /* Responsive tweaks for the new pieces. */
  @media (max-width: 640px) {
    .cb-welcome { padding-top: 32px; }
    .cb-welcome-stats { gap: 6px; }
    .cb-stat { font-size: 10.5px; padding: 4px 9px; }
    .cb-viewport-bar { padding: 6px 8px; gap: 6px; }
    .cb-vp-btn { padding: 4px 8px; font-size: 11px; }
    .cb-vp-btn .cb-vp-label { display: none; }
    .cb-viewport-info { font-size: 10.5px; }
    .cb-msg-meta-stats { display: none; }
  }
  @media (max-width: 480px) {
    .cb-msg-card { border-radius: var(--doc-radius-md); }
    .cb-act span { display: none; }
    .cb-act[data-act="regenerate"] span { display: inline; }
  }