.chat-shell {
  --chat-ink: #172B44;
  --chat-muted: #52647A;
  --chat-primary: #1556A8;
  --chat-border: #CAD5E2;
  --chat-control-border: #74869B;
  --chat-focus: #713AC5;
  --chat-surface: #FFFFFF;
  --chat-canvas: #F4F7FB;
  color: var(--chat-ink);
  background: var(--chat-canvas);
  border: 1px solid var(--chat-border);
  border-radius: 12px;
  overflow: clip;
  min-width: 0;
  font: 400 16px/1.5 system-ui, -apple-system, Segoe UI, sans-serif;
}
.chat-shell *, .chat-shell *::before, .chat-shell *::after { box-sizing: border-box; }
.chat-shell :focus-visible { outline: 3px solid var(--chat-focus); outline-offset: 3px; }
.chat-header, .chat-pane-heading, .chat-detail-heading, .chat-list-top,
.chat-composer-footer, .chat-contact, .chat-bottom { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.chat-header { padding: 16px 20px 8px; background: var(--chat-surface); }
.chat-header h1 { font-size: 28px; line-height: 36px; margin: 0; }
.chat-demo-badge { color: #176547; background: #EAF6EE; border-radius: 999px; padding: 4px 10px; font-size: 12px; }
.chat-scope { margin: 0; padding: 0 20px 16px; background: var(--chat-surface); color: var(--chat-muted); font-size: 14px; }
.chat-panes { display: grid; grid-template-columns: 320px minmax(0, 1fr); min-height: min(70dvh, 800px); border-top: 1px solid var(--chat-border); }
.chat-shell:not([data-view="detail"]) .chat-panes { grid-template-columns: minmax(0, 1fr); }
.chat-list-pane { min-width: 0; background: var(--chat-surface); border-right: 1px solid var(--chat-border); padding: 16px; overflow: auto; }
.chat-pane-heading h2, .chat-detail-heading h2, .chat-secondary-pane h2 { margin: 0; font-size: 22px; line-height: 30px; }
.chat-detail-heading h2 { font-size: 18px; line-height: 26px; }
.chat-detail-pane { display: grid; min-width: 0; grid-template-rows: auto auto minmax(260px, 1fr) auto; min-height: min(70dvh, 800px); background: var(--chat-surface); }
.chat-detail-heading { padding: 12px 20px; border-bottom: 1px solid var(--chat-border); }
.chat-detail-heading > div { min-width: 0; flex: 1; }
.chat-detail-heading h2, .chat-context, .chat-preview { overflow-wrap: anywhere; }
.chat-context, .chat-preview { color: var(--chat-muted); font-size: 14px; }
.chat-detail-heading .chat-context { margin: 0; }
.chat-audience { margin: 0; padding: 10px 20px; background: #EAF0F7; font-size: 14px; }
.chat-label { display: grid; gap: 5px; font-weight: 600; }
.chat-input, .chat-textarea { display: block; width: 100%; min-width: 0; padding: 10px 12px; border: 1px solid var(--chat-control-border); border-radius: 8px; color: var(--chat-ink); background: var(--chat-surface); font: inherit; }
.chat-input { min-height: 44px; }
.chat-textarea { min-height: 88px; resize: vertical; overflow-wrap: anywhere; }
.chat-list-pane > .chat-label, .chat-check { margin-top: 16px; }
.chat-check { display: flex; gap: 8px; align-items: center; font-size: 14px; }
.chat-check input { width: 20px; height: 20px; }
.chat-list, .chat-transcript, .chat-contact-list, .chat-participants { list-style: none; margin: 0; padding: 0; }
.chat-list { margin-top: 16px; display: grid; gap: 8px; }
.chat-list-item { display: grid; width: 100%; gap: 4px; text-align: left; padding: 12px; border: 1px solid var(--chat-border); border-radius: 8px; color: var(--chat-ink); background: var(--chat-surface); font: inherit; cursor: pointer; }
.chat-list-item:hover, .chat-list-item.is-selected { border-color: var(--chat-primary); background: #F4F7FB; }
.chat-list-top { align-items: flex-start; }
.chat-list-top strong { min-width: 0; overflow-wrap: anywhere; }
.chat-unread { flex: none; border-radius: 999px; color: #1556A8; background: #EAF0F7; font-size: 12px; padding: 2px 7px; }
.chat-preview { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.chat-transcript { overflow-y: auto; overscroll-behavior: contain; padding: 20px; display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.chat-message { max-width: min(80%, 720px); padding: 12px 16px; border: 1px solid var(--chat-border); border-radius: 12px; background: var(--chat-canvas); min-width: 0; }
.chat-message-meta { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: baseline; font-size: 14px; }
.chat-message-meta time { color: var(--chat-muted); font-size: 12px; }
.chat-message-body { margin: 8px 0 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.chat-composer { position: sticky; bottom: 0; z-index: 1; padding: 12px 20px calc(12px + env(safe-area-inset-bottom)); border-top: 1px solid var(--chat-border); background: var(--chat-surface); }
.chat-composer-footer { margin-top: 8px; align-items: flex-end; }
.chat-hint { color: var(--chat-muted); font-size: 14px; margin: 6px 0; }
.chat-button { min-height: 44px; padding: 9px 14px; border: 1px solid var(--chat-control-border); border-radius: 8px; color: var(--chat-ink); background: var(--chat-surface); font: 600 14px/1.3 system-ui, sans-serif; cursor: pointer; }
.chat-button:hover { background: #EAF0F7; }
.chat-button:disabled { opacity: .65; cursor: wait; }
.chat-primary { background: var(--chat-primary); border-color: var(--chat-primary); color: white; }
.chat-primary:hover { background: #104681; color: white; }
.chat-link-button { padding: 6px 0; border: 0; color: var(--chat-primary); background: transparent; font: 600 14px/1.5 system-ui, sans-serif; text-decoration: underline; cursor: pointer; }
.chat-back { display: none; }
.chat-secondary-pane { min-width: 0; padding: 24px; background: var(--chat-surface); }
.chat-secondary-pane h2 { margin: 12px 0; }
.chat-secondary-pane .chat-audience { padding: 12px; border-radius: 8px; }
.chat-contact-list, .chat-participants { display: grid; gap: 12px; margin-top: 20px; }
.chat-contact, .chat-participants li { padding: 12px; border: 1px solid var(--chat-border); border-radius: 8px; }
.chat-contact span { overflow-wrap: anywhere; }
.chat-action-form { max-width: 720px; margin-top: 20px; }
.chat-source { border-left: 3px solid var(--chat-primary); padding: 10px 16px; margin: 16px 0; background: var(--chat-canvas); white-space: pre-wrap; overflow-wrap: anywhere; }
.chat-confirmation { color: #176547; background: #EAF6EE; padding: 12px; border-radius: 8px; }
.chat-alert { margin: 0; padding: 10px 20px; color: #8A4B08; background: #FFF5DE; }
.chat-empty { color: var(--chat-muted); padding: 20px; }
.chat-record-filter { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-top: 12px; padding: 8px; background: var(--chat-canvas); font-size: 14px; }
.chat-bottom { justify-content: flex-start; padding: 8px 20px; background: var(--chat-surface); border-top: 1px solid var(--chat-border); }
.chat-live { min-height: 24px; margin: 0; padding: 5px 20px 12px; color: #176547; background: var(--chat-surface); font-size: 14px; }
.chat-live.is-error { color: #B42318; }
@media (max-width: 900px) {
  .chat-panes { grid-template-columns: minmax(240px, 36%) minmax(0, 1fr); }
  .chat-composer-footer { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 767px) {
  .chat-header { padding: 12px 16px 8px; }
  .chat-header h1 { font-size: 24px; line-height: 32px; }
  .chat-scope { padding: 0 16px 12px; }
  .chat-demo-badge { max-width: 45%; text-align: right; }
  .chat-panes { display: block; min-height: calc(100dvh - 190px); }
  .chat-shell[data-view="detail"] .chat-list-pane { display: none; }
  .chat-detail-pane { min-height: calc(100dvh - 190px); grid-template-rows: auto auto minmax(160px, 1fr) auto; }
  .chat-list-pane { min-height: calc(100dvh - 190px); border-right: 0; padding: 16px; }
  .chat-back { display: inline-block; }
  .chat-detail-heading { gap: 8px; flex-wrap: wrap; padding: 12px 16px; }
  .chat-detail-heading > div { flex-basis: 100%; order: 2; }
  .chat-detail-heading > .chat-back { order: 0; }
  .chat-detail-heading > .chat-secondary { order: 1; }
  .chat-audience { padding: 10px 16px; }
  .chat-transcript { padding: 16px; }
  .chat-message { max-width: 96%; }
  .chat-composer { position: static; padding: 12px 16px calc(12px + env(safe-area-inset-bottom)); }
  .chat-composer-footer { align-items: stretch; }
  .chat-secondary-pane { padding: 16px; min-height: calc(100dvh - 190px); }
  .chat-contact { align-items: flex-start; flex-direction: column; }
  .chat-contact .chat-button { width: 100%; }
}
@media (max-width: 400px) {
  .chat-pane-heading { align-items: flex-start; flex-direction: column; }
  .chat-pane-heading .chat-button { width: 100%; }
  .chat-demo-badge { font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) { .chat-shell * { scroll-behavior: auto !important; } }