/* engine.css — archival-exhibit forensic console, fully self-contained */
:root {
  --paper: #e6e8e1;
  --paper-2: #dfe1d9;
  --edge: #cfd3c8;
  --ink: #18202c;
  --ink-2: #3a4456;
  --faint: #717a6b;
  --pen: #b0392b;
  --pen-dim: #8f3024;
  --mono: "SF Mono", ui-monospace, "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background-image: radial-gradient(rgba(24, 32, 44, .035) 1px, transparent 1px);
  background-size: 4px 4px;
  /* scrolling console — no overflow:hidden */
}

:focus-visible { outline: 2px solid var(--pen); outline-offset: 3px; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 28px; }

/* ---- masthead ---- */
.masthead {
  border-bottom: 1.5px solid var(--ink);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
}
.masthead .wrap {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding-top: 16px;
  padding-bottom: 12px;
  gap: 20px;
  flex-wrap: wrap;
}
.brand {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .04em;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.brand b { font-weight: 600; }
.brand-sub {
  color: var(--faint);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.masthead-nav { font-family: var(--mono); font-size: 12px; }
.nav-link { color: var(--faint); text-decoration: none; letter-spacing: .06em; }
.nav-link:hover { color: var(--pen); }

/* ---- corpus picker ---- */
.picker-section {
  padding: 28px 0 0;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.picker-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--faint);
}
#corpus-select {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  background: var(--paper-2);
  border: 1.5px solid var(--ink);
  padding: 6px 12px;
  border-radius: 2px;
  cursor: pointer;
  appearance: auto;
}
#corpus-select:focus-visible { outline: 2px solid var(--pen); outline-offset: 3px; }

/* ---- case stamp (summary stats) ---- */
.case-stamp {
  margin-top: 20px;
  padding: 16px 0;
  border-top: 1.5px solid var(--ink);
  border-bottom: 1.5px solid var(--ink);
}
.stamp-corpus-label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-2);
  margin-bottom: 14px;
  letter-spacing: .04em;
}
.case-stamp-grid {
  display: flex;
  gap: 0;
  flex-wrap: wrap;
}
.stat-cell {
  padding: 8px 28px 8px 0;
  margin-right: 28px;
  border-right: 1px solid var(--edge);
}
.stat-cell:last-child { border-right: none; padding-right: 0; margin-right: 0; }
.stat-n {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 500;
  color: var(--ink);
  line-height: 1;
}
.stat-n.elevated { color: var(--pen); }
.stat-label {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--faint);
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-top: 5px;
}

/* ---- section heads ---- */
.findings-section { margin-top: 32px; }
.section-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--faint);
}

/* ---- findings list ---- */
.findings-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

/* ---- exhibit card ---- */
.exhibit-card {
  background: var(--paper-2);
  border: 1.5px solid var(--ink);
  box-shadow: 6px 6px 0 rgba(24, 32, 44, .09);
}

/* card header: badge + layer chips + seqs */
.card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 10px 16px;
  border-bottom: 1.5px solid var(--ink);
  font-family: var(--mono);
  font-size: 11px;
}

/* confidence badge */
.badge {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 2px;
  border: 1.5px solid var(--pen);
  white-space: nowrap;
}
.badge.elevated {
  background: var(--pen);
  color: #fff;
  transform: rotate(-2deg);
}
.badge.low {
  background: transparent;
  color: var(--faint);
  border-color: var(--edge);
}

/* layer chips */
.layer-chips {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}
.layer-chip {
  font-size: 10px;
  font-weight: 600;
  color: var(--pen);
  border: 1px solid var(--pen);
  padding: 1px 7px;
  border-radius: 2px;
  letter-spacing: .06em;
}
.layer-chip.low-conf {
  color: var(--faint);
  border-color: var(--edge);
}

.card-seqs {
  color: var(--faint);
  font-size: 11px;
  letter-spacing: .04em;
  margin-left: auto;
}

/* ---- card body: signal rows ---- */
.card-body {
  position: relative;
  padding: 8px 0;
}

/* convergence trace overlay — positioned inside card-body */
.trace-rail {
  position: absolute;
  left: 21px;
  width: 2px;
  background: var(--pen);
  top: 0;
  height: 0;
  opacity: 0;
  transition: opacity .3s, height .35s, top .35s;
  z-index: 2;
}
.layer-node {
  position: absolute;
  left: 14px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--pen);
  background: var(--paper-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 7px;
  font-weight: 600;
  color: var(--pen);
  opacity: 0;
  transform: scale(.4);
  transition: opacity .3s, transform .3s;
  z-index: 3;
  pointer-events: none;
  user-select: none;
}
.layer-node.anchor {
  border-radius: 2px;
  transform: rotate(45deg) scale(.4);
  background: var(--pen);
  color: #fff;
}

/* tracing state on the card */
.exhibit-card.tracing .trace-rail {
  opacity: 1;
}
.exhibit-card.tracing .layer-node {
  opacity: 1;
  transform: scale(1);
}
.exhibit-card.tracing .layer-node.anchor {
  transform: rotate(45deg) scale(1);
}
.exhibit-card.tracing .signal-row:not(.on) {
  opacity: .3;
}
.exhibit-card.tracing .signal-row.on {
  box-shadow: inset 3px 0 0 var(--pen);
}

/* signal row layout */
.signal-row {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 8px;
  padding: 7px 16px 7px 46px;
  font-size: 12.5px;
  transition: opacity .25s, box-shadow .15s;
}
.signal-layer-id {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--pen);
  font-weight: 600;
  padding-top: 1px;
}
.signal-layer-id.low-conf { color: var(--faint); }
.signal-detail {
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.55;
}
.signal-meta {
  display: block;
  font-size: 11px;
  color: var(--faint);
  margin-top: 2px;
}

/* convergence legend (revealed on trace) */
.conv-legend {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height .35s, opacity .35s;
  border-top: 0 solid var(--ink);
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-2);
}
.conv-legend.show {
  max-height: 120px;
  opacity: 1;
  border-top: 1.5px solid var(--ink);
}
.conv-legend .in {
  padding: 10px 16px;
  line-height: 1.85;
}
.conv-legend .hl { color: var(--pen); font-weight: 600; }

/* card summary text */
.card-summary {
  padding: 10px 16px;
  border-top: 1px solid var(--edge);
  font-size: 13px;
  color: var(--ink-2);
  line-height: 1.6;
}

/* card footer */
.card-foot {
  border-top: 1.5px solid var(--ink);
  padding: 8px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--faint);
}
.trace-btn {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .07em;
  color: var(--pen);
  background: transparent;
  border: 1.5px solid var(--pen);
  padding: 4px 11px;
  border-radius: 2px;
  cursor: pointer;
  transition: background .16s, color .16s;
}
.trace-btn:hover { background: var(--pen); color: #fff; }
.trace-btn[aria-pressed="true"] { background: var(--pen); color: #fff; }

/* ---- narration panel ---- */
.narration-section { margin-top: 40px; margin-bottom: 60px; }
.narration-block {
  background: var(--paper-2);
  border: 1.5px solid var(--ink);
  padding: 20px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-2);
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---- site footer ---- */
.site-footer {
  border-top: 1.5px solid var(--ink);
  padding: 24px 0 48px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--faint);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.site-footer a { color: var(--faint); text-decoration: none; }
.site-footer a:hover { color: var(--pen); }

/* ---- responsive ---- */
@media (max-width: 640px) {
  .brand-sub { display: none; }
  .card-head { gap: 8px; }
  .card-seqs { margin-left: 0; width: 100%; }
  .stat-cell { border-right: none; padding-right: 0; margin-right: 16px; }
}

/* ---- reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}