:root {
  --cb-bg: #ffffff;
  --cb-fg: #1a1a1a;
  --cb-muted: #6b7280;
  --cb-accent: #2563eb;
  --cb-accent-weak: #eff6ff;
  --cb-border: #e5e7eb;
  --cb-user-bg: #2563eb;
  --cb-user-fg: #ffffff;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; display: flex; flex-direction: column;
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--cb-fg); background: var(--cb-bg);
}
.cb-head { display: flex; gap: 10px; align-items: center; padding: 14px 16px; border-bottom: 1px solid var(--cb-border); }
.cb-head-text { flex: 1; min-width: 0; }
.cb-clear { border: 1px solid var(--cb-border); background: var(--cb-bg); color: var(--cb-muted);
  width: 30px; height: 30px; border-radius: 8px; cursor: pointer; font-size: 14px; }
.cb-clear:hover { color: var(--cb-accent); border-color: var(--cb-accent); }
.cb-avatar { width: 34px; height: 34px; border-radius: 10px; background: var(--cb-accent); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 15px; }
.cb-title { font-weight: 650; }
.cb-sub { color: var(--cb-muted); font-size: 12px; }
.cb-messages { flex: 1; overflow-y: auto; padding: 14px 16px; display: flex; flex-direction: column; gap: 10px; }
.cb-note { color: var(--cb-muted); font-size: 12.5px; text-align: center; padding: 8px 18px; }
.cb-msg { max-width: 88%; padding: 9px 12px; border-radius: 12px; white-space: pre-wrap; overflow-wrap: break-word; }
.cb-msg.user { align-self: flex-end; background: var(--cb-user-bg); color: var(--cb-user-fg); border-bottom-right-radius: 4px; }
.cb-msg.bot { align-self: flex-start; background: #f3f4f6;
  background: color-mix(in srgb, var(--cb-fg) 6%, var(--cb-bg)); /* themed tint, old browsers keep gray */
  border-bottom-left-radius: 4px; }
.cb-msg.bot.refusal { background: #fef3c7; color: #713f12; }   /* fixed status colors: readable on any panel */
.cb-msg.bot.error { background: #fee2e2; color: #7f1d1d; }
.cb-msg .cursor { display: inline-block; width: 7px; height: 14px; background: var(--cb-muted);
  vertical-align: -2px; animation: cb-blink 1s steps(2) infinite; }
@keyframes cb-blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .cb-msg .cursor { animation: none; } }
.cb-msg.bot .cb-md-h { font-weight: 650; margin: 6px 0 2px; }
.cb-msg.bot p { margin: 0 0 6px; }
.cb-msg.bot p:last-child { margin-bottom: 0; }
.cb-msg.bot ul, .cb-msg.bot ol { margin: 4px 0 6px; padding-left: 20px; }
.cb-msg.bot li { margin: 2px 0; }
.cb-msg.bot blockquote { margin: 6px 0; padding: 4px 10px; border-left: 3px solid var(--cb-border);
  color: var(--cb-muted); }
.cb-msg.bot code { background: rgba(0,0,0,.06);
  background: color-mix(in srgb, var(--cb-fg) 8%, transparent); border-radius: 4px; padding: 1px 5px;
  font: 12.5px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.cb-msg.bot pre { background: #0f172a; color: #e2e8f0; border-radius: 8px; padding: 10px;
  overflow-x: auto; margin: 6px 0; }
.cb-msg.bot pre code { background: none; color: inherit; padding: 0; font-size: 12.5px; }
.cb-sources { margin-top: 8px; display: flex; flex-direction: column; gap: 6px; }
.cb-source { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.cb-source a { font-size: 12.5px; color: var(--cb-accent); text-decoration: none;
  background: var(--cb-accent-weak); border: 1px solid var(--cb-border); padding: 4px 9px; border-radius: 999px; }
.cb-source a:hover { border-color: var(--cb-accent); }
.cb-source .cb-showme { font-size: 12px; border: 1px solid var(--cb-border); background: var(--cb-bg);
  color: var(--cb-fg); border-radius: 999px; padding: 4px 9px; cursor: pointer; }
.cb-source .cb-showme:hover { border-color: var(--cb-accent); color: var(--cb-accent); }
.cb-suggestions { display: flex; gap: 6px; flex-wrap: wrap; padding: 8px 16px 0; }.cb-suggestions button { font-size: 12.5px; border: 1px solid var(--cb-border); background: var(--cb-bg);
  border-radius: 999px; padding: 6px 10px; cursor: pointer; color: var(--cb-fg); }
.cb-suggestions button:hover { border-color: var(--cb-accent); color: var(--cb-accent); }
.cb-page-ctx { margin: 8px 16px 0; padding: 6px 10px; background: var(--cb-accent-weak);
  border: 1px solid var(--cb-border); border-radius: 8px; font-size: 12px; color: var(--cb-muted);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cb-page-ctx b { color: var(--cb-accent); font-weight: 600; }
.cb-composer { display: flex; gap: 8px; padding: 10px 12px 12px; border-top: 1px solid var(--cb-border); }
.cb-composer input { flex: 1; border: 1px solid var(--cb-border); border-radius: 10px;
  padding: 10px 12px; font: inherit; outline: none; }
.cb-composer input:focus { border-color: var(--cb-accent); }
.cb-composer button { border: none; background: var(--cb-accent); color: #fff; border-radius: 10px;
  width: 42px; font-size: 15px; cursor: pointer; }
.cb-composer button:disabled { opacity: .5; cursor: default; }