:root { color-scheme: light; font: 16px/1.5 system-ui, sans-serif; color: #172036; background: #f4f6fb; }
body { margin: 0; }
main { width: min(760px, calc(100% - 32px)); margin: 72px auto; }
header { display: flex; align-items: baseline; justify-content: space-between; gap: 24px; }
h1 { margin-bottom: 24px; font-size: 2.2rem; letter-spacing: -.04em; }
#status { color: #65708b; }
form { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 10px; padding: 12px; background: white; border-radius: 14px; box-shadow: 0 8px 32px #20305012; }
input, button { box-sizing: border-box; min-width: 0; font: inherit; border: 1px solid #cad1df; border-radius: 9px; padding: 12px 14px; }
input { width: 100%; }
button { min-width: 76px; color: white; background: #3b5ccc; border-color: #3b5ccc; cursor: pointer; }
button:disabled { opacity: .55; cursor: wait; }
#answer, #notices { margin: 18px 0; padding: 14px 16px; border-radius: 10px; background: #eaf0ff; white-space: pre-wrap; }
#notices { background: #fff3d9; }
#thread { margin-top: 8px; }
.turn { margin: 0 0 30px; }
.turn + .turn { padding-top: 26px; border-top: 1px solid #e2e7f2; }
.asked { font-size: 1.08rem; font-weight: 650; color: #172036; }
.interpreted { margin-top: 4px; color: #65708b; font-size: .9rem; font-style: italic; }
.turn-status { margin-top: 6px; color: #65708b; font-size: .88rem; }
.answer, .notice { margin: 14px 0; padding: 14px 16px; border-radius: 10px; background: #eaf0ff; white-space: pre-wrap; }
.notice { background: #fff3d9; }
.results { padding: 0; margin: 12px 0 0; list-style: none; }
.clear { color: #52607d; background: white; border-color: #d4dbea; }
.clear[hidden] { display: none; }
.clear:hover { color: #1d378d; border-color: #aebce1; }
.result { margin: 12px 0; padding: 16px; background: white; border-radius: 12px; box-shadow: 0 4px 20px #2030500d; }
.result.provisional { border-left: 3px solid #9bace3; animation: reveal .18s ease-out; }
.head { font-weight: 650; }
.meta, .description { color: #65708b; }
@keyframes reveal { from { opacity: 0; transform: translateY(4px); } }
@media (max-width: 560px) {
  main { width: min(100% - 20px, 760px); margin-top: 28px; }
  header { display: block; }
  h1 { font-size: 1.8rem; }
  form { grid-template-columns: minmax(0, 1fr); }
  button { width: 100%; }
}
.tabs { display: flex; gap: 6px; margin: 0; padding: 0 20px; background: white; border-bottom: 1px solid #e3e7f1; }
.tab { box-sizing: border-box; display: inline-flex; align-items: center; justify-content: center; min-width: 130px; padding: 10px 12px; color: #52607d; background: transparent; border: 0; border-bottom: 3px solid transparent; border-radius: 8px 8px 0 0; cursor: pointer; font-weight: 700; text-decoration: none; white-space: nowrap; }
.tab:hover { color: #2747b3; background: #eef1fa; }
.tab[aria-selected="true"] { color: #2747b3; background: white; border-bottom-color: #3b5ccc; }
.samples { margin: 18px 0 24px; }
.samples summary { width: fit-content; margin: 0 0 10px; color: #52607d; cursor: pointer; font-size: .95rem; font-weight: 700; }
.samples:not([open]) summary { margin-bottom: 0; }
.samples summary:hover { color: #294ebd; }
.sample-queries { display: flex; flex-wrap: wrap; gap: 8px; }
.sample-query { width: auto; min-width: 0; max-width: 100%; color: #344566; background: #e9edf8; border-color: #d8deed; padding: 7px 10px; font-size: .85rem; overflow-wrap: anywhere; text-align: left; }
.sample-query:hover { color: #223f9d; background: #dfe6fb; border-color: #afbee9; }
@media (max-width: 960px) {
  .tab { flex: 1; }
}
@media (max-width: 560px) {
  .tabs { width: 100%; }
  .tab { min-width: 0; padding-inline: 4px; font-size: .82rem; }
  .sample-query { width: 100%; }
}

.usage-open { margin: 6px 0; padding: 7px 10px; color: #3653ae; background: white; border-color: #d4dbea; font-size: .84rem; }
.usage-open:hover { color: #1d378d; border-color: #aebce1; }
.usage-open span { color: #65708b; }
#usage { background: white; white-space: normal; }
.usage-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; padding-right: 36px; }
.usage-head h2 { margin: 0; font-size: 1rem; }
.usage-head span, td small { color: #65708b; }
.table-wrap { overflow-x: auto; }
table { width: 100%; margin-top: 10px; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th, td { padding: 8px; border-top: 1px solid #e2e6ef; text-align: right; }
td small { display: block; font-size: .72rem; }
.usage-dialog { width: min(780px, calc(100% - 32px)); }
.dialog-close { position: absolute; top: 14px; right: 14px; width: 36px; height: 36px; padding: 0; color: #52607d; background: #eef1f8; border-color: transparent; border-radius: 50%; font-size: 1.5rem; line-height: 1; }
.dialog-close:hover { color: #172036; background: #e1e6f2; }
@media (max-width: 560px) {
  .usage-head, .head { align-items: flex-start; flex-direction: column; gap: 4px; }
  dialog { width: calc(100% - 20px); max-height: calc(100vh - 20px); padding: 24px 22px; }
}

/* ---- chat shell: conversations beside a scrolling thread ---------------- */
/* Only `.scroll` scrolls. Without this the document scrolls too: scrollIntoView
   walks every scrollable ancestor, so scrolling a new turn into view moved the
   whole page and carried the top bar -- with the query cost on it -- off the
   screen, while the container it was meant to scroll never moved. */
html, body { height: 100%; overflow: hidden; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
/* No transition on grid-template-columns: it left the grid stuck at the
   collapsed track sizes after the class was removed -- body carried no
   `sidebar-collapsed` class while the computed columns still read `0px 1280px`.
   The panel opens and closes instantly, which is honest and always correct. */
.shell { display: grid; grid-template-columns: 280px minmax(0, 1fr); height: 100vh; }
body.sidebar-collapsed .shell { grid-template-columns: 0 minmax(0, 1fr); }
/* Hidden by clipping rather than `display: none`, so the column can animate
   shut instead of snapping, and so the panel keeps its scroll position.
   `min-width: 0` is what actually lets it close: a grid item defaults to
   `min-width: auto` and refuses to shrink below its content, so the column
   goes to zero while the panel stays 280px wide and overflows it. */
.sidebar { overflow: hidden; min-width: 0; }
body.sidebar-collapsed .sidebar { padding-inline: 0; border-right: none; visibility: hidden; }


.sidebar { display: flex; flex-direction: column; gap: 10px; min-height: 0; padding: 14px 12px;
  background: #f2f4f9; border-right: 1px solid #dfe4ef; }
.sidebar-head { display: flex; align-items: center; justify-content: space-between; }
.sidebar-head h2 { margin: 0; font-size: .95rem; color: #2b344a; }
.icon { width: 30px; height: 30px; padding: 0; font-size: 1rem; line-height: 1; color: #3653ae;
  background: white; border: 1px solid #d4dbea; border-radius: 7px; cursor: pointer; }
.icon:hover { border-color: #aebce1; }
.search { width: 100%; padding: 7px 9px; font-size: .84rem; border: 1px solid #d8deed;
  border-radius: 7px; background: white; }

.conversations { flex: 1; min-height: 0; overflow-y: auto; display: flex; flex-direction: column; gap: 3px; }
.conversation { position: relative; display: grid; gap: 1px; padding: 7px 26px 7px 9px;
  border-radius: 7px; cursor: pointer; }
.conversation:hover { background: #e5eaf6; }
.conversation.active { background: #dfe6fb; }
.conversation-open { display: block; width: 100%; padding: 0; font-size: .86rem; text-align: left;
  color: #22304d; background: none; border: none; cursor: pointer;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conversation-meta { font-size: .74rem; color: #74809a; }
.conversation-delete { position: absolute; top: 6px; right: 6px; width: 18px; height: 18px;
  padding: 0; font-size: .9rem; line-height: 1; color: #8a93a8; background: none;
  border: none; border-radius: 4px; cursor: pointer; opacity: 0; }
.conversation:hover .conversation-delete { opacity: 1; }
.conversation-delete:hover { color: #a3324a; background: #f3d9df; }
.sidebar-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding-top: 8px; font-size: .74rem; color: #74809a; border-top: 1px solid #dfe4ef; }
.link-button { padding: 0; font-size: .74rem; color: #6b7690; background: none; border: none;
  text-decoration: underline; cursor: pointer; }
.link-button:hover { color: #a3324a; }
.empty { margin: 8px 2px; font-size: .8rem; color: #74809a; }

/* Overrides the single-column layout this file was written for: `main` there is
   a centred 760px column with a 72px top margin, which in a full-height shell
   squeezes the thread and pushes the top bar -- and the query cost on it -- off
   the screen. */
main { display: grid; grid-template-rows: auto auto minmax(0, 1fr) auto;
  width: auto; max-width: none; min-width: 0; height: 100vh; margin: 0; }
.topbar { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; padding: 10px 20px;
  background: white; border-bottom: 1px solid #e3e7f1; }
/* The title is the only thing here that may shrink, and a flex item will not
   shrink below its content without min-width:0 -- without it the bar overflows
   at narrow widths and pushes the query cost off the right edge instead of
   ellipsising the title. Everything else keeps its size, and wraps if it must. */
.topbar h1 { flex: 1 1 auto; min-width: 0; margin: 0; font-size: 1rem;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topbar .chip, .topbar .mode, .topbar .usage-open, .topbar .icon { flex: 0 0 auto; }
.chip { padding: 3px 9px; font-size: .74rem; color: #3d4a68; background: #eef1f9;
  border: 1px solid #dfe4ef; border-radius: 999px; white-space: nowrap; }
.spacer { flex: 1; }
.mode select { padding: 5px 8px; font-size: .8rem; color: #2b344a; background: white;
  border: 1px solid #d4dbea; border-radius: 7px; }

.scroll { min-height: 0; overflow-y: auto; padding: 18px 20px 8px; }
.intro { max-width: 780px; }

.composer { display: flex; align-items: flex-end; gap: 8px; padding: 12px 20px 16px;
  background: white; border-top: 1px solid #e3e7f1; }
.composer textarea { flex: 1; min-height: 42px; max-height: 200px; padding: 11px 12px;
  font: inherit; font-size: .92rem; line-height: 1.45; color: #1b2130; resize: none;
  background: white; border: 1px solid #cfd7e8; border-radius: 10px; }
.composer textarea:focus { outline: 2px solid #b9c6ec; outline-offset: -1px; border-color: #8fa4dd; }
.send { padding: 11px 18px; font-size: .9rem; }

@media (max-width: 760px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .sidebar { display: none; }
}

/* Removing a turn, or the conversation it belongs to. Both stay quiet until
   hovered: a delete control that advertises itself invites the accident. */
.turn-head { display: flex; align-items: flex-start; gap: 10px; }
.turn-head .asked { flex: 1 1 auto; min-width: 0; }
.turn-delete { flex: 0 0 auto; width: 22px; height: 22px; padding: 0; font-size: 1rem;
  line-height: 1; color: #8a93a8; background: none; border: none; border-radius: 5px;
  cursor: pointer; opacity: 0; transition: opacity .12s ease; }
.turn:hover .turn-delete, .turn-delete:focus-visible { opacity: 1; }
.turn-delete:hover { color: #a3324a; background: #f3d9df; }
.icon.danger { color: #a3324a; border-color: #e6c9d1; }
.icon.danger:hover { background: #f7e6ea; border-color: #d99aa9; }