/* Raccord UI.
   Targets WCAG 2.2 AA: full keyboard operation, visible focus, no colour-only
   status, 400% reflow, prefers-reduced-motion respected, semantic tables for
   every data view. See docs/ACCESSIBILITY_CONFORMANCE.md. */

:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef1f5;
  --ink: #14181f;
  --ink-2: #4a5361;
  --line: #c8cfda;         /* decorative separators: cards, table rules */
  --control-line: #6d7787;  /* boundary of an operable control: >= 3:1 (WCAG 1.4.11) */
  --accent: #1c4fd8;
  --accent-ink: #ffffff;
  --ok: #0f6c3d;
  --warn: #8a5200;
  --bad: #9b1c1c;
  --evidence: #1c4fd8;
  --hypothesis: #6b3fa0;
  --policy: #8a5200;
  --verify: #0f6c3d;
  --radius: 10px;
  --focus: #0b57d0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --surface: #161b22;
    --surface-2: #1e242d;
    --ink: #f2f5f9;
    --ink-2: #b6c0cd;
    --line: #333c48;
    --control-line: #8b97a7;
    --accent: #7aa2ff;
    --accent-ink: #06101f;
    --ok: #6fd39b;
    --warn: #f0be5c;
    --bad: #ff9a90;
    --evidence: #7aa2ff;
    --hypothesis: #c4a2ff;
    --policy: #f0be5c;
    --verify: #6fd39b;
    --focus: #a8c7fa;
  }
}

* { box-sizing: border-box; }

html { font-size: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 1rem/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* --- focus and skip link ------------------------------------------------ */
:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0.75rem 1.25rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* --- top bar ------------------------------------------------------------ */
.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.25rem;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; gap: 0.7rem; align-items: center; }
.brand-mark { font-size: 1.8rem; line-height: 1; color: var(--accent); }
.brand-name { margin: 0; font-weight: 700; font-size: 1.15rem; letter-spacing: -0.01em; }
.brand-sub { margin: 0; font-size: 0.8rem; color: var(--ink-2); }

.event-strip { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.event-chip { display: flex; flex-direction: column; }
.chip-label {
  font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--ink-2);
}
.chip-value { font-size: 0.92rem; font-weight: 600; }

.topbar-actions { display: flex; gap: 0.5rem; }

/* --- buttons ------------------------------------------------------------ */
.btn {
  font: inherit;
  font-size: 0.9rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius);
  border: 1px solid var(--control-line);
  background: var(--surface-2);
  color: var(--ink);
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn-quiet { background: transparent; }

/* --- tabs --------------------------------------------------------------- */
.tabs { background: var(--surface); border-bottom: 1px solid var(--line); }
.tabs ul {
  display: flex; flex-wrap: wrap; gap: 0.25rem;
  list-style: none; margin: 0; padding: 0 1rem;
}
.tabs button[role="tab"] {
  font: inherit;
  font-size: 0.92rem;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 0.7rem 0.9rem;
  color: var(--ink-2);
  cursor: pointer;
}
.tabs button[aria-selected="true"] {
  color: var(--ink);
  font-weight: 650;
  border-bottom-color: var(--accent);
}

/* --- layout ------------------------------------------------------------- */
main { padding: 1.5rem 1.25rem 4rem; max-width: 88rem; margin: 0 auto; }
main:focus { outline: none; }
h1 { font-size: 1.5rem; margin: 0 0 0.35rem; letter-spacing: -0.015em; }
h2 { font-size: 1.05rem; margin: 0 0 0.4rem; }
h3 { font-size: 0.92rem; margin: 1rem 0 0.35rem; color: var(--ink-2); }
.lede { color: var(--ink-2); max-width: 62ch; margin: 0 0 1.25rem; }

.grid-2 {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(24rem, 1fr));
  margin-bottom: 1rem;
}
.replay-grid {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(22rem, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem 1.15rem;
  margin-bottom: 1rem;
}
.card-note { color: var(--ink-2); font-size: 0.85rem; margin: 0 0 0.75rem; max-width: 68ch; }
.hint { color: var(--ink-2); font-size: 0.85rem; }

/* --- stage colouring: always paired with a text label ------------------- */
.stage-tag {
  display: inline-block;
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  margin-right: 0.5rem;
  border: 1px solid currentColor;
}
.stage-evidence { border-left: 5px solid var(--evidence); }
.stage-evidence .stage-tag { color: var(--evidence); }
.stage-hypothesis { border-left: 5px solid var(--hypothesis); }
.stage-hypothesis .stage-tag { color: var(--hypothesis); }
.stage-policy { border-left: 5px solid var(--policy); }
.stage-policy .stage-tag { color: var(--policy); }
.stage-verify { border-left: 5px solid var(--verify); }
.stage-verify .stage-tag { color: var(--verify); }
/* Interrogating a diagnosis is a hypothesis-stage activity, so it reuses that
   stage's colour rather than introducing a text/background pair the contrast
   audit does not already check. */
.stage-ask { border-left: 5px solid var(--hypothesis); }
.stage-ask .stage-tag { color: var(--hypothesis); }

/* --- ask the agent ------------------------------------------------------ */
.ask-form label {
  display: block; font-size: 0.85rem; color: var(--ink-2); margin-bottom: 0.35rem;
}
.ask-form input[type="text"] { flex: 1 1 22rem; }
.ask-suggestions { margin: 0.6rem 0 0.25rem; }
.btn-small { font-size: 0.78rem; padding: 0.3rem 0.55rem; }
.ask-log { margin-top: 0.5rem; }
.ask-entry {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.75rem 0.85rem;
  margin-top: 0.75rem;
  background: var(--surface-2);
}
.ask-q { font-weight: 600; margin: 0 0 0.4rem; }
.ask-a { margin: 0 0 0.5rem; white-space: pre-wrap; max-width: 78ch; }
.ask-meta { font-size: 0.8rem; color: var(--ink-2); margin: 0; }
.ask-evidence { margin-top: 0.6rem; }

/* --- stat tiles --------------------------------------------------------- */
.stat-row {
  display: grid; gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  margin-bottom: 1.25rem;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.8rem 0.9rem;
}
.stat dt {
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--ink-2); margin: 0 0 0.3rem;
}
.stat dd { margin: 0; font-size: 1.45rem; font-weight: 680; letter-spacing: -0.02em; }
.stat .stat-sub { font-size: 0.78rem; color: var(--ink-2); font-weight: 400; }

/* --- status text (never colour alone) ----------------------------------- */
.status { font-weight: 650; white-space: nowrap; }
.status::before { margin-right: 0.35rem; font-weight: 700; }
.status-ok { color: var(--ok); }
.status-ok::before { content: "✓"; }
.status-bad { color: var(--bad); }
.status-bad::before { content: "✕"; }
.status-warn { color: var(--warn); }
.status-warn::before { content: "!"; }
.status-idle { color: var(--ink-2); }
.status-idle::before { content: "·"; }

/* --- tables ------------------------------------------------------------- */
.table-wrap { overflow-x: auto; }
.log-wrap { max-height: 22rem; overflow-y: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.86rem; }
caption { text-align: left; }
th, td {
  text-align: left; padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--line); vertical-align: top;
}
thead th { color: var(--ink-2); font-size: 0.74rem; text-transform: uppercase;
  letter-spacing: 0.05em; }
tbody tr:hover { background: var(--surface-2); }
td code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem; }

/* --- key/value ---------------------------------------------------------- */
.kv { display: grid; grid-template-columns: minmax(9rem, auto) 1fr; gap: 0.3rem 0.9rem;
  margin: 0; font-size: 0.87rem; }
.kv dt { color: var(--ink-2); }
.kv dd { margin: 0; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

/* --- budget bars -------------------------------------------------------- */
.budget { margin-bottom: 0.6rem; }
.budget-head { display: flex; justify-content: space-between; font-size: 0.85rem; }
.budget-track {
  height: 0.55rem; background: var(--surface-2); border: 1px solid var(--line);
  border-radius: 999px; overflow: hidden; margin-top: 0.2rem;
}
.budget-fill { height: 100%; background: var(--ok); }
.budget-fill.warn { background: var(--warn); }
.budget-fill.bad { background: var(--bad); }

/* --- state machine ------------------------------------------------------ */
.state-machine {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  list-style: none; margin: 0 0 0.75rem; padding: 0;
}
.state-machine li {
  font-size: 0.76rem; padding: 0.3rem 0.6rem; border-radius: 999px;
  border: 1px solid var(--control-line); color: var(--ink-2); background: var(--surface);
}
.state-machine li.done { border-color: var(--ok); color: var(--ok); font-weight: 650; }
.state-machine li.done::before { content: "✓ "; }
.state-machine li.current {
  border-color: var(--accent); color: var(--accent); font-weight: 700;
  box-shadow: inset 0 0 0 1px var(--accent);
}
.state-machine li.current::before { content: "▶ "; }

/* --- evidence / hypotheses ---------------------------------------------- */
.evidence, .hypotheses, .causal, .timeline { list-style: none; margin: 0; padding: 0; }
.evidence li, .causal li {
  border-bottom: 1px solid var(--line); padding: 0.55rem 0; font-size: 0.87rem;
}
.evidence .tool {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.76rem; color: var(--evidence); display: block;
}
.hypotheses li {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 0.6rem 0.7rem; margin-bottom: 0.5rem; font-size: 0.88rem;
}
.hypotheses li.top { border-color: var(--hypothesis); border-width: 2px; }
.posterior { font-weight: 700; font-variant-numeric: tabular-nums; }
.uncertainty { color: var(--ink-2); font-size: 0.8rem; display: block; margin-top: 0.3rem; }

.timeline li {
  display: grid; grid-template-columns: 5rem 1fr; gap: 0.6rem;
  padding: 0.35rem 0; border-bottom: 1px solid var(--line); font-size: 0.86rem;
}
.timeline .t { font-family: ui-monospace, monospace; color: var(--ink-2); }
.timeline .late { color: var(--bad); font-weight: 650; }

/* --- comms -------------------------------------------------------------- */
.comm {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 0.7rem 0.85rem; margin-bottom: 0.6rem;
}
.comm h3 { margin: 0 0 0.35rem; font-size: 0.9rem; color: var(--ink); }
.comm .audience {
  font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--ink-2);
}
.comm pre {
  white-space: pre-wrap; margin: 0.4rem 0 0; font: inherit; font-size: 0.87rem;
}
.comm.public { border-color: var(--ok); border-width: 2px; }

/* --- fields ------------------------------------------------------------- */
.field-row { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center;
  margin-bottom: 0.75rem; }
label { font-size: 0.85rem; font-weight: 600; }
select, input[type="text"] {
  font: inherit; font-size: 0.9rem; padding: 0.45rem 0.55rem;
  border: 1px solid var(--control-line); border-radius: var(--radius);
  background: var(--surface); color: var(--ink); min-width: 16rem;
}

/* --- footer ------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--line); padding: 1rem 1.25rem;
  color: var(--ink-2); font-size: 0.82rem; background: var(--surface);
}
.footer a { color: var(--accent); }

/* --- reflow (WCAG 1.4.10) ------------------------------------------------
   At 320 CSS pixels — a 1280px viewport zoomed to 400% — every multi-column
   grid collapses to one column and the fixed key/value columns become fluid,
   so nothing requires two-dimensional scrolling. Wide data tables keep their
   own horizontal scroll container (.table-wrap), which the exception for
   tabular data permits. */
@media (max-width: 48rem) {
  .grid-2, .replay-grid { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); }
  select, input[type="text"] { min-width: 0; width: 100%; }
  .field-row { align-items: stretch; }
  main { padding: 1rem 0.75rem 3rem; }
  .tabs ul { padding: 0 0.5rem; }
}
@media (max-width: 30rem) {
  .kv, .timeline li { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: 1fr; }
  .event-strip { gap: 0.75rem; }
}

/* --- motion ------------------------------------------------------------- */
@media (prefers-reduced-motion: no-preference) {
  .budget-fill { transition: width 240ms ease; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* --- forced colours ----------------------------------------------------- */
@media (forced-colors: active) {
  .btn, .card, .stat, .state-machine li { border: 1px solid CanvasText; }
  .budget-fill { background: Highlight; }
}