.matter-chat { margin-top: 20px; border: 1px solid #d8e2dc; border-radius: 12px; overflow: hidden; background: #fffefa; color: #213c38; }
.matter-chat [hidden] { display: none; }
.matter-chat h3 { font-size: 14px; font-weight: 650; margin: 0; }
.matter-chat p { line-height: 1.6; }
.matter-chat-layout { display: grid; grid-template-columns: 220px minmax(0,1fr); }
.matter-chat-threads { padding: 20px 14px; background: #f1f5f1; min-width: 0; border-right: 1px solid #d8e2dc; }
.matter-chat-threads > .btn { width: 100%; font-size: 13px; }
.matter-chat-threads h3 { margin: 24px 0 12px; font-size: 12px; color: #60766b; }
.matter-chat-thread-list { max-height: 65vh; overflow: auto; margin: 12px -6px; }
.matter-chat-thread { display: block; padding: 12px; border-radius: 8px; overflow-wrap: anywhere; font-size: 13px; }
.matter-chat-thread small, .matter-chat-document small, .matter-chat-saved small { display: block; font-size: 11px; color: #5a7067; margin-top: 5px; }
.matter-chat-thread.is-selected { background: #dcebe2; }
.matter-chat-discussion { min-width: 0; display: flex; flex-direction: column; }
.matter-chat-discussion-header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px; padding: 16px 24px; border-bottom: 1px solid #e3e8e1; }
.matter-chat-title-row { display: flex; flex: 1 1 180px; align-items: center; gap: 8px; min-width: 0; }
.matter-chat-title-row h3 { overflow-wrap: anywhere; }
.matter-chat-toolbar { display: flex; flex-wrap: wrap; gap: 4px; }
.matter-chat-parent { flex-basis: 100%; font-size: 12px; text-decoration: underline; }
.matter-chat-control { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 36px; padding: 7px 10px; border: 1px solid transparent; border-radius: 7px; background: transparent; color: #365d51; font: inherit; font-size: 12px; cursor: pointer; }
.matter-chat-control:hover, .matter-chat-control[aria-pressed=true] { background: #e7efe9; }
.matter-chat :focus-visible { outline: 2px solid #236556; outline-offset: 3px; }
.matter-chat-count { font-size: 11px; color: #60766b; }
.matter-chat-mobile-toggle { display: none; }
.matter-chat-messages { min-height: 350px; max-height: 65vh; overflow-y: auto; padding: 28px clamp(20px,4vw,64px); scroll-behavior: smooth; }
.matter-chat-message { max-width: 840px; margin: 0 auto 32px; overflow-wrap: anywhere; font-size: 14px; }
.matter-chat-message.user { background: #e7efe9; margin-left: max(30px,15%); padding: 16px 20px; border-radius: 14px; }
.matter-chat-message header { display: flex; justify-content: space-between; gap: 12px; font-size: 12px; margin-bottom: 10px; }
.matter-chat-message header small { font-size: 10px; color: #687c73; }
.matter-chat-answer p { margin: 10px 0; white-space: pre-wrap; }
.matter-chat-answer-meta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; font-size: 11px; margin: 12px 0; }
.matter-chat-answer-actions { display: flex; align-items: flex-start; gap: 4px 8px; flex-wrap: wrap; margin-top: 12px; }
.matter-chat-answer-actions > form { margin: 0; }
.matter-chat summary { cursor: pointer; font-size: 12px; font-weight: 500; padding: 8px 10px; min-height: 36px; border-radius: 7px; }
.matter-chat summary:hover { background: #e7efe9; }
.matter-chat-sources[open], .matter-chat-answer-more[open] { flex-basis: 100%; border: 1px solid #d8e2dc; border-radius: 8px; padding: 0 8px 8px; background: #f5f7f2; }
.matter-chat-sources div { padding: 12px 8px; border-top: 1px solid #d8e2dc; }
.matter-chat-sources a, .matter-chat-document a, .matter-chat-saved a { color: #1d6457; text-decoration: underline; }
.matter-chat-sources p, .matter-chat-sources small { display: block; font-size: 12px; }
.matter-chat-task-proposal { margin: 16px 0; padding: 16px; border: 1px solid #d8e2dc; border-radius: 8px; background: #f5f7f2; }
.matter-chat-task-proposal h4 { font-weight: 700; }
.matter-chat-task-proposal h4 small { margin-left: 8px; font-weight: 400; }
.matter-chat-task-proposal form { display: grid; gap: 8px; }
.matter-chat-task-proposal input, .matter-chat-task-proposal textarea, .matter-chat-task-proposal select { width: 100%; min-width: 0; }
.matter-chat-hint { font-size: 12px; color: #60766b; margin: 10px 0; }
.matter-chat-composer { padding: 16px 24px; border-top: 1px solid #d8e2dc; margin-top: auto; }
.matter-chat-composer-footer { display: flex; align-items: center; gap: 12px; justify-content: space-between; margin-top: 8px; }
.matter-chat input, .matter-chat textarea, .matter-chat select { box-sizing: border-box; max-width: 100%; width: 100%; border: 1px solid #cbd8ce; border-radius: 7px; padding: 9px; font: inherit; font-size: 14px; background: white; color: #213c38; }
.matter-chat textarea { resize: vertical; }
.matter-chat label { display: block; margin: 16px 0 6px; font-size: 12px; font-weight: 600; }
.matter-chat input[type=submit] { white-space: normal; background: #236556; color: white; }
.matter-chat-document, .matter-chat-saved { font-size: 13px; padding: 16px 0; border-bottom: 1px solid #d8e2dc; overflow-wrap: anywhere; }
.matter-chat-empty { display: grid; place-items: center; min-height: 260px; color: #60766b; }
.matter-chat-empty h3 { font-size: 20px; font-weight: 400; }
.matter-chat-panel { margin: auto; padding: 24px; width: min(560px,calc(100vw - 32px)); max-height: calc(100dvh - 48px); overflow: auto; border: 1px solid #d8e2dc; border-radius: 12px; background: #fffefa; color: #213c38; box-shadow: 0 20px 80px #12382c33; box-sizing: border-box; }
.matter-chat-panel::backdrop { background: #18392d66; }
.matter-chat-panel > header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.matter-chat-panel > header h3 { font-size: 17px; }
.matter-chat-panel p { font-size: 13px; }
.matter-chat-panel select { overflow: auto; }
.matter-chat .matter-chat-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.matter-research-tools { margin: 24px 0; }
.matter-research-tools > summary { cursor: pointer; font-size: 14px; font-weight: 600; margin-bottom: 16px; }
@media(max-width:700px) {
  .matter-chat-layout { display: flex; flex-direction: column; }
  .matter-chat-threads { display: none; border-right: 0; border-bottom: 1px solid #d8e2dc; padding: 16px; order: 1; }
  .matter-chat.threads-open .matter-chat-threads { display: block; }
  .matter-chat.threads-open .matter-chat-discussion { display: contents; }
  .matter-chat.threads-open .matter-chat-messages, .matter-chat.threads-open .matter-chat-composer { order: 2; }
  .matter-chat-mobile-toggle { display: inline-flex; border-color: #d8e2dc; }
  .matter-chat-title-row { flex-basis: 100%; }
  .matter-chat-discussion-header { padding: 12px; }
  .matter-chat-thread-list { max-height: 240px; }
  .matter-chat-control, .matter-chat summary { min-height: 44px; }
  .matter-chat-messages { padding: 20px 16px; min-height: 260px; max-height: 60vh; }
  .matter-chat-composer { padding: 12px; }
  .matter-chat input, .matter-chat textarea, .matter-chat select { font-size: 16px; }
  .matter-chat-message.user { margin-left: 12px; padding: 14px; }
  .matter-chat-panel { padding: 18px; }
}
@media(prefers-reduced-motion:reduce) { .matter-chat-messages { scroll-behavior: auto; } }
.research-document-scope { margin: 20px 0; border: 0; padding: 0; min-width: 0; }
.research-document-scope legend { font-size: 13px; font-weight: 650; margin-bottom: 8px; }
.matter-chat label.research-scope-option, .matter-chat label.research-document-option { display: flex; align-items: flex-start; gap: 10px; padding: 12px; margin: 6px 0; border: 1px solid #d8e2dc; border-radius: 8px; cursor: pointer; }
.matter-chat label.research-document-option[hidden] { display: none; }
.matter-chat .research-scope-option input, .matter-chat .research-document-option input { width: 18px; height: 18px; flex: 0 0 18px; margin-top: 2px; padding: 0; accent-color: #236556; }
.research-scope-option:has(input:checked), .research-document-option:has(input:checked) { background: #e7efe9; }
.research-scope-option span, .research-document-option span { min-width: 0; overflow-wrap: anywhere; }
.research-scope-option small, .research-document-option small { display: block; margin-top: 4px; color: #60766b; font-size: 12px; font-weight: 400; }
.research-picker-actions { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 10px; }
.research-picker-list { max-height: 260px; overflow-y: auto; padding: 2px; }
.research-picker-error { color: #962a23; margin: 10px 0; }