:root {
  --bg: #f7f7f5; --fg: #1d1d1b; --muted: #66665f; --line: #deded8;
  --accent: #1f5f8b; --accent-fg: #fff; --card: #fff; --warn: #8a3b12; --ok: #276437;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #161615; --fg: #ececea; --muted: #a3a39c; --line: #34342f; --accent: #6fb0dc; --accent-fg: #0d1b24; --card: #1f1f1d; --warn: #f0a57a; --ok: #8fd19e; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); line-height: 1.5; }
header.top { display: flex; flex-wrap: wrap; gap: .5rem 1rem; align-items: center; justify-content: space-between; padding: .75rem 1rem; border-bottom: 1px solid var(--line); background: var(--card); }
header.top nav { display: flex; flex-wrap: wrap; gap: .25rem 1rem; align-items: center; }
.brand { font-weight: 700; color: var(--fg); text-decoration: none; }
a { color: var(--accent); }
.who { color: var(--muted); font-size: .9rem; }
main { max-width: 60rem; margin: 0 auto; padding: 1rem; }
form.inline { display: inline; margin: 0; }
button { font: inherit; padding: .5rem .9rem; border-radius: .4rem; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-fg); cursor: pointer; }
button[disabled] { opacity: .6; cursor: default; }
button.link { background: none; border: 0; color: var(--accent); padding: 0; text-decoration: underline; }
button.secondary, .feedback button[data-rating] { background: var(--card); color: var(--fg); border-color: var(--line); }
.feedback button[aria-pressed="true"] { border-color: var(--accent); outline: 2px solid var(--accent); }
textarea, input[type=text], input[type=email], select { width: 100%; font: inherit; padding: .5rem; border: 1px solid var(--line); border-radius: .4rem; background: var(--card); color: var(--fg); }
label { display: block; font-weight: 600; margin-bottom: .25rem; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.ask-form { display: grid; gap: .5rem; }
.ask-form button { justify-self: start; }
.agent-toggle { display: flex; gap: .4rem; align-items: center; font-size: .9rem; }
.answer { margin-top: 1.25rem; padding: 1rem; background: var(--card); border: 1px solid var(--line); border-radius: .5rem; overflow-wrap: anywhere; }
.answer.not-found { border-left: 4px solid var(--warn); }
.answer-text table { border-collapse: collapse; display: block; overflow-x: auto; }
.answer-text th, .answer-text td, table.data th, table.data td { border: 1px solid var(--line); padding: .3rem .5rem; text-align: left; vertical-align: top; }
pre { overflow-x: auto; background: var(--bg); padding: .5rem; }
a.cite { text-decoration: none; font-weight: 600; }
.sources ol { padding-left: 1.2rem; }
.sources li { margin: .6rem 0; }
.sources li:target { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.sources .n { color: var(--muted); }
.crumb, .meta, .muted { color: var(--muted); font-size: .9rem; }
.snippet { margin: .4rem 0; padding: .5rem .75rem; border-left: 3px solid var(--line); white-space: pre-wrap; }
.searched dl { display: grid; grid-template-columns: max-content 1fr; gap: .2rem 1rem; }
.searched dt { font-weight: 600; }
.searched dd { margin: 0; }
.feedback { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin-top: 1rem; border-top: 1px solid var(--line); padding-top: .75rem; }
.feedback textarea { flex-basis: 100%; }
.error { color: var(--warn); font-weight: 600; }
.ok { color: var(--ok); font-weight: 600; }
.login, .message { max-width: 28rem; margin: 2rem auto; }
.picker { display: flex; flex-wrap: wrap; gap: .5rem; }
table.data { border-collapse: collapse; width: 100%; font-size: .92rem; }
.table-wrap { overflow-x: auto; }
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: .5rem; padding: .75rem 1rem; }
.card h2, .card h3 { margin-top: 0; font-size: 1rem; }
.big { font-size: 1.6rem; font-weight: 700; }
.spark { width: 100%; height: 2.5rem; color: var(--accent); }
.row-form { display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; }
.row-form select, .row-form input { width: auto; }
.badge { display: inline-block; padding: 0 .4rem; border-radius: .3rem; border: 1px solid var(--line); font-size: .8rem; }
.badge.excluded { color: var(--warn); border-color: var(--warn); }
.badge.pass { color: var(--ok); border-color: var(--ok); }
.badge.fail { color: var(--warn); border-color: var(--warn); }
@media (max-width: 40rem) {
  main { padding: .75rem; }
  .searched dl { grid-template-columns: 1fr; }
}
.subnav { display: flex; flex-wrap: wrap; gap: .25rem 1rem; margin: .5rem 0 1rem; }
.subnav a[aria-current="page"] { font-weight: 700; text-decoration: none; }
.row-form + .row-form { margin-top: .3rem; }
/* Conversation threads (ADR 0021) */
.chat-layout { display: grid; grid-template-columns: 14rem minmax(0, 1fr); gap: 1.25rem; align-items: start; }
.threads { position: sticky; top: 1rem; display: grid; gap: .5rem; font-size: .9rem; }
.threads ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .25rem; max-height: 60vh; overflow-y: auto; }
.threads li { overflow-wrap: anywhere; }
.threads li.current a { font-weight: 700; color: var(--fg); }
.threads .new-chat { font-weight: 600; }
.small { font-size: .8rem; }
.thread-delete { display: flex; justify-content: flex-end; margin-bottom: .5rem; }
.thread { display: grid; gap: .5rem; margin-bottom: .5rem; }
.msg { padding: .6rem .8rem; border-radius: .5rem; border: 1px solid var(--line); overflow-wrap: anywhere; }
.msg.user { background: var(--bg); justify-self: end; max-width: 85%; }
.msg.assistant { background: var(--card); }
.msg.hidden-msg { color: var(--muted); font-style: italic; }
.chat-main .ask { margin-top: 1rem; }
@media (max-width: 40rem) {
  .chat-layout { grid-template-columns: 1fr; }
  .threads { position: static; }
  .threads ul { max-height: 12rem; }
}