:root {
  color-scheme: light;
  --bg:#f1f3f4; --panel:#fff; --quiet:#e8ecef; --line:#cbd2d8; --field:#fff; --fieldBorder:#8897a1;
  --text:#20272c; --muted:#52616c; --accent:#38596e; --accentHover:#29475a; --selected:#e7eff4; --selectedStrong:#dce8ef;
  --soft:#f2f5f7; --softHover:#e4e9ed; --proof:#e9eef1; --hintBg:#f3ecdf; --amber:#78521d; --red:#a33432; --ok:#2e6b4a; --okBg:#e4f1ea;
  --me:#dfe9f0; --them:#f4f6f7;
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg:#141a1e; --panel:#1b2328; --quiet:#222c32; --line:#34424a; --field:#121a1f; --fieldBorder:#4f606a;
  --text:#e3e9ec; --muted:#9aacb6; --accent:#7fb0cc; --accentHover:#9cc4da; --selected:#243640; --selectedStrong:#2c4452;
  --soft:#202a30; --softHover:#28343b; --proof:#1f292f; --hintBg:#3a2f1c; --amber:#e3b56b; --red:#f08a8a; --ok:#8fd0ab; --okBg:#1f3328;
  --me:#2a3b46; --them:#222c32;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  color-scheme: dark;
  --bg:#141a1e; --panel:#1b2328; --quiet:#222c32; --line:#34424a; --field:#121a1f; --fieldBorder:#4f606a;
  --text:#e3e9ec; --muted:#9aacb6; --accent:#7fb0cc; --accentHover:#9cc4da; --selected:#243640; --selectedStrong:#2c4452;
  --soft:#202a30; --softHover:#28343b; --proof:#1f292f; --hintBg:#3a2f1c; --amber:#e3b56b; --red:#f08a8a; --ok:#8fd0ab; --okBg:#1f3328;
  --me:#2a3b46; --them:#222c32;
} }
* { box-sizing:border-box; }
html { min-height:100%; }
body { margin:0; background:var(--bg); color:var(--text); font:16px/1.6 var(--sans); }
a { color:var(--accent); text-underline-offset:4px; }
button,input,select,textarea { font:inherit; }
:focus-visible { outline:3px solid var(--accent); outline-offset:3px; }
.wrap { max-width:1460px; margin:0 auto; padding:26px 32px 64px; }
h1,h2,h3,h4 { color:var(--text); text-wrap:balance; }
h1 { font:600 23px/1.35 var(--mono); margin:0; letter-spacing:-.035em; }
h2 { font-size:23px; line-height:1.35; margin:0 0 14px; }
h3 { font:600 15px/1.45 var(--mono); margin:0 0 16px; }
h4 { font-size:14px; margin:20px 0 4px; }
p { margin:0 0 16px; } p:last-child { margin-bottom:0; }
.muted { color:var(--muted); } .amber { color:var(--amber); } .red { color:var(--red); } .ok { color:var(--ok); }
.panel { background:var(--panel); border:1px solid var(--line); border-radius:8px; padding:24px; min-width:0; }
.panel + .panel { margin-top:20px; }
.row { display:flex; gap:12px; align-items:center; flex-wrap:wrap; }
.spread { display:flex; justify-content:space-between; align-items:center; gap:20px; margin-bottom:24px; }
.spread select { width:auto; min-width:142px; }
.brand { display:flex; align-items:center; gap:14px; } .brand img { width:34px; height:34px; flex:none; }
.grow { flex:1; }
label { display:block; font-size:14px; font-weight:550; margin:16px 0 6px; }
input,select,textarea { width:100%; min-width:0; border:1px solid var(--fieldBorder); border-radius:5px; padding:10px 12px; background:var(--field); color:var(--text); caret-color:var(--accent); }
input::placeholder,textarea::placeholder { color:var(--muted); opacity:1; }
input[type=checkbox],input[type=radio] { width:18px; height:18px; accent-color:var(--accent); flex:0 0 18px; margin:4px 0 0; }
textarea { resize:vertical; min-height:120px; line-height:1.6; }
button,.btn { border:1px solid var(--accent); border-radius:5px; padding:10px 16px; min-height:42px; color:#fff; background:var(--accent); font:550 13px/1.45 var(--mono); cursor:pointer; text-align:center; text-decoration:none; display:inline-block; }
:root[data-theme="dark"] button, :root[data-theme="dark"] .btn { color:#0f171c; }
button:hover,.btn:hover { background:var(--accentHover); }
button.secondary,.btn.secondary { background:transparent; color:var(--accent); border-color:var(--fieldBorder); }
button.secondary:hover,.btn.secondary:hover { background:var(--selected); }
button.small { padding:6px 10px; min-height:32px; font-size:12px; }
button:disabled { background:var(--quiet); color:var(--muted); border-color:var(--line); cursor:wait; }
form > button { margin-top:20px; }
.theme-toggle { min-height:36px; padding:6px 10px; }
.sentence { display:flex; align-items:flex-start; gap:10px; font-size:14px; font-weight:400; line-height:1.5; margin:8px 0; padding:10px; border:1px solid var(--line); border-radius:5px; cursor:pointer; background:var(--panel); }
.sentence:hover { background:var(--soft); }
.sentence:has(input:checked) { background:var(--selected); border-color:var(--accent); }
fieldset { border:0; border-top:1px solid var(--line); padding:14px 0 8px; margin:20px 0 0; min-width:0; }
legend { font-size:15px; font-weight:600; padding:0 8px 0 0; }
details { border-bottom:1px solid var(--line); padding:12px 0; }
summary { cursor:pointer; font-size:14px; font-weight:550; padding:4px 0; }
details[open] > summary { margin-bottom:14px; }
.feedback { font-size:14px; margin:0 0 16px; border:1px solid currentColor; border-radius:5px; padding:12px 16px; }
.feedback:empty { display:none; }
.feedback.ok { color:var(--ok); background:var(--okBg); }
.mono-badge { font:12px/1.5 var(--mono); }
.badge { display:inline-block; font:11px/1.4 var(--mono); padding:2px 8px; border-radius:12px; border:1px solid var(--line); color:var(--muted); margin-left:6px; vertical-align:middle; }
.badge.missing { color:var(--amber); border-color:var(--amber); }
.badge.test { color:var(--amber); border-color:var(--amber); }
.result { background:var(--soft); border-radius:5px; padding:16px; margin-top:12px; font-size:14px; }
.debrief-card { border-top:1px solid var(--line); padding:24px 0; }
.debrief-card:first-of-type { margin-top:24px; }
.debrief-card h3 { font-size:17px; }
.rules-list { padding-left:20px; } .rules-list li { margin:10px 0; font-weight:550; }
table { width:100%; border-collapse:collapse; font-variant-numeric:tabular-nums; }
th,td { text-align:left; padding:14px 12px; border-bottom:1px solid var(--line); }
th { color:var(--muted); font:12px/1.5 var(--mono); }
pre { white-space:pre-wrap; overflow-wrap:anywhere; font-size:13px; }
.hidden { display:none !important; }
/* arrival */
.arrival { display:grid; grid-template-columns:1.15fr 1fr; gap:72px; max-width:1050px; margin:9vh auto 40px; align-items:start; }
.arrival-copy { padding:24px 0; }
.arrival-copy h2 { font-size:clamp(28px,3vw,40px); line-height:1.2; letter-spacing:-.025em; max-width:18ch; margin-bottom:24px; }
.arrival-copy p { color:var(--muted); max-width:48ch; }
.arrival-steps { list-style:none; padding:0; margin:32px 0; border-top:1px solid var(--line); }
.arrival-steps li { padding:12px 0; border-bottom:1px solid var(--line); font:13px/1.6 var(--mono); }
.join-form h2 { font:600 19px/1.4 var(--mono); } .join-form > button { width:100%; }
.join-form #code { font-family:var(--mono); letter-spacing:.1em; text-transform:uppercase; }
.join-safety { margin:20px 0 0; color:var(--muted); font-size:13px; }
.session-tools { display:flex; justify-content:space-between; gap:20px; align-items:baseline; border-top:1px solid var(--line); padding:12px 0; margin-bottom:8px; }
.session-tools strong { font:600 13px var(--mono); }
.resume { font-size:13px; margin-bottom:20px; }
.briefing { max-width:860px; margin:28px auto; padding:36px; } .briefing > p { max-width:72ch; } .briefing > button { margin-top:24px; }
/* play */
.topbar { display:flex; align-items:center; justify-content:space-between; gap:24px; padding:16px 0; border-block:1px solid var(--line); margin-bottom:24px; font:12px/1.5 var(--mono); }
.topbar progress { width:140px; height:6px; accent-color:var(--accent); border:0; border-radius:0; }
progress::-webkit-progress-bar { background:var(--line); } progress::-webkit-progress-value { background:var(--accent); }
#timer { white-space:nowrap; font-variant-numeric:tabular-nums; }
.stage-heading { margin-bottom:24px; max-width:95ch; }
.stage-heading .mono-badge { display:block; margin-top:10px; color:var(--muted); }
.stage-heading > p { color:var(--muted); font-size:15px; max-width:86ch; }
.investigation-grid { display:grid; grid-template-columns:230px minmax(0,1fr) 350px; gap:24px; align-items:start; }
.source-rail,.proof-panel,.centre { min-width:0; }
.source-rail { padding:18px 0; } .source-rail input { font-size:13px; margin-bottom:18px; }
.source-group + .source-group { border-top:1px solid var(--line); margin-top:24px; padding-top:20px; }
.source-entry { margin:0 0 8px; }
.source-button { display:flex; width:100%; flex-direction:column; text-align:left; gap:7px; padding:12px; font:500 13px/1.5 var(--sans); border:1px solid transparent; background:transparent; color:var(--text); }
.source-button:hover { background:var(--softHover); }
.source-button[aria-pressed=true] { background:var(--selected); border-color:var(--accent); }
.source-status { color:var(--muted); font:11px/1.4 var(--mono); }
.reader { min-height:360px; padding:30px; background:var(--panel); border:1px solid var(--line); border-radius:8px; }
.reader h3 { font-size:20px; font-family:var(--sans); line-height:1.45; margin:0 0 24px; padding-bottom:20px; border-bottom:1px solid var(--line); }
.reader-body { font-size:16px; line-height:1.85; max-width:72ch; overflow-wrap:anywhere; white-space:pre-wrap; }
.reader-empty { min-height:200px; display:flex; flex-direction:column; justify-content:center; }
.reader-empty p { color:var(--muted); font-size:15px; max-width:48ch; }
.reader-empty h3 { border:0; margin-bottom:8px; padding:0; }
/* interaction panel (chat / search / inspect) */
.interaction { background:var(--panel); border:1px solid var(--line); border-radius:8px; padding:20px; margin-bottom:20px; }
.interaction h3 { margin-bottom:12px; }
.transcript { display:flex; flex-direction:column; gap:10px; max-height:360px; overflow:auto; padding:4px 0; margin-bottom:14px; }
.bubble { max-width:88%; padding:10px 14px; border-radius:10px; font-size:14px; line-height:1.55; white-space:pre-wrap; }
.bubble.me { align-self:flex-end; background:var(--me); border-bottom-right-radius:3px; }
.bubble.them { align-self:flex-start; background:var(--them); border:1px solid var(--line); border-bottom-left-radius:3px; }
.bubble.hit { border-color:var(--accent); }
.search-row,.chat-row { display:flex; gap:10px; align-items:flex-start; }
.search-row input,.chat-row input { flex:1; }
.search-results { margin-top:14px; }
.search-results .result { margin-top:8px; border-left:3px solid var(--accent); }
.search-results .query { font:12px/1.5 var(--mono); color:var(--muted); margin:14px 0 4px; }
.moves { display:flex; flex-wrap:wrap; gap:8px; margin-top:12px; } .moves button { text-align:left; }
.proof-panel { background:var(--proof); padding:20px; border:1px solid var(--line); border-radius:8px; }
.proof-panel h3 { margin-bottom:8px; }
.proof-panel .sentence:has(input:checked) { background:var(--selectedStrong); }
.proof-panel label[for=note] { font-size:13px; color:var(--muted); font-weight:400; }
.proof-panel > p { font-size:13px; color:var(--muted); }
.proof-panel .form-actions { display:flex; flex-direction:column; gap:12px; margin-top:16px; }
.help-block { margin-top:24px; border-top:1px solid var(--line); padding-top:20px; font-size:13px; }
.help-block > button { width:100%; margin-bottom:10px; }
.help-block .hint-text { margin-top:12px; padding:10px; background:var(--hintBg); color:var(--amber); border-radius:5px; }
.table-panel { overflow-x:auto; }
/* facilitator & editor */
.tabs { display:flex; gap:8px; flex-wrap:wrap; margin-bottom:20px; }
.tabs button[aria-current=page] { background:var(--selected); }
.card-list .panel { margin-top:16px; }
.lang-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:12px; }
.lang-grid label { margin:0 0 4px; font-size:12px; color:var(--muted); font-family:var(--mono); }
.lang-grid textarea { min-height:70px; font-size:14px; }
.lang-grid input { font-size:14px; }
.field { margin:14px 0; } .field > .fname { font-size:14px; font-weight:550; margin-bottom:6px; display:flex; align-items:center; gap:8px; flex-wrap:wrap; }
.field .help { font-size:12px; color:var(--muted); margin:0 0 8px; }
.step-card { border:1px solid var(--line); border-radius:8px; margin-top:16px; background:var(--panel); }
.step-card > summary { padding:14px 20px; display:flex; align-items:center; gap:12px; flex-wrap:wrap; }
.step-card > summary .grow { flex:1; min-width:160px; }
.step-card .body { padding:0 20px 20px; }
.step-card.disabled > summary { opacity:.6; }
.sub-card { border:1px dashed var(--line); border-radius:6px; padding:12px 14px; margin:10px 0; background:var(--soft); }
.sub-card .toolbar { display:flex; justify-content:space-between; gap:8px; align-items:center; margin-bottom:6px; }
.inline-fields { display:grid; grid-template-columns:repeat(auto-fit,minmax(200px,1fr)); gap:10px; }
.sticky-actions { position:sticky; bottom:0; background:var(--bg); padding:12px 0; border-top:1px solid var(--line); display:flex; gap:10px; flex-wrap:wrap; align-items:center; z-index:2; }
.mono { font-family:var(--mono); }
.check-list { font-size:13px; margin:8px 0 0; padding-left:18px; color:var(--muted); }
@media (min-width:1500px) { .investigation-grid { grid-template-columns:250px minmax(0,1fr) 370px; } }
@media (max-width:1150px) {
 .investigation-grid { grid-template-columns:220px minmax(0,1fr); }
 .proof-panel { grid-column:2; } .source-rail { grid-row:span 2; }
 .arrival { gap:40px; }
}
@media (max-width:720px) {
 .wrap { padding:20px 18px 40px; } .spread { align-items:flex-start; gap:14px; }
 h1 { font-size:17px; } .brand { gap:9px; } .brand img { width:26px; height:26px; }
 .spread select { min-width:112px; width:112px; font-size:13px; padding:8px; }
 .arrival { grid-template-columns:1fr; gap:24px; margin:30px 0; }
 .arrival-copy { padding:0; } .arrival-copy h2 { max-width:25ch; font-size:29px; }
 .arrival-steps { margin:20px 0 0; }
 .panel,.briefing { padding:22px; }
 .investigation-grid { grid-template-columns:1fr; gap:20px; }
 .source-rail,.proof-panel,.centre { grid-column:1; grid-row:auto; } .source-rail { padding:0; }
 .source-list { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:8px; }
 .source-button { border-color:var(--line); height:100%; } .source-entry { margin:0; }
 .reader { padding:24px; min-height:240px; }
 .topbar { flex-wrap:wrap; gap:10px; } .topbar progress { width:70px; }
 table { font-size:13px; } th,td { padding:10px 8px; }
}