/* ============================================================
   PROOF — the shell
   Three zones that never change: track rail (left),
   work surface (centre), trust rail (right, on demand).
   Time spine pinned to the bottom of the work surface.
   ============================================================ */

.app {
  display: grid;
  grid-template-columns: var(--rail-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr;
  grid-template-areas:
    "brand  topbar"
    "rail   work";
  height: 100vh;
  height: 100dvh;
}

/* ---------------- brand block ---------------- */
.brand {
  grid-area: brand;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 16px;
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background: var(--surface);
}
.brand-mark {
  width: 20px; height: 20px;
  flex: none;
  border-radius: 3px;
  background: var(--ink);
  color: var(--surface);
  display: grid; place-items: center;
  font-size: 10px; font-weight: 700; letter-spacing: -.02em;
}
.brand-name { font-size: var(--fs-base); font-weight: 650; letter-spacing: .01em; }
.brand-sub  { font-size: var(--fs-micro); color: var(--ink-muted); letter-spacing: .04em; text-transform: uppercase; }

/* ---------------- topbar ---------------- */
.topbar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 18px 0 20px;
  border-bottom: 1px solid var(--hairline);
  background: var(--surface);
}

.crumb { display: flex; align-items: center; gap: 8px; min-width: 0; }
.crumb-level {
  font-size: var(--fs-micro); font-weight: 700; letter-spacing: .08em;
  color: var(--ink-muted);
  border: 1px solid var(--hairline-strong);
  border-radius: 3px; padding: 1px 5px;
}
.crumb-title { font-size: var(--fs-base); font-weight: 600; letter-spacing: -.008em; }
.crumb-q { font-size: var(--fs-sm); color: var(--ink-muted); font-style: italic; }

/* synthetic-data marker — always visible, never dismissible */
.synth-flag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: var(--fs-micro); font-weight: 650; letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  background: repeating-linear-gradient(
    135deg, transparent 0 5px, var(--surface-wash) 5px 10px);
  border: 1px solid var(--hairline-strong);
  border-radius: 3px;
  padding: 3px 8px;
  white-space: nowrap;
}
.synth-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--warning); flex: none; }

.icon-btn {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: var(--r-md);
  color: var(--ink-secondary);
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.icon-btn:hover { background: var(--surface-wash); color: var(--ink); }

/* ---------------- track rail ---------------- */
.rail {
  grid-area: rail;
  border-right: 1px solid var(--hairline);
  background: var(--surface);
  display: flex; flex-direction: column;
  min-height: 0;
}
.rail-scroll { flex: 1 1 auto; min-height: 0; overflow-y: auto; padding: 12px 0 8px; }

.rail-head {
  padding: 4px 16px 8px;
  display: flex; align-items: baseline; justify-content: space-between;
}

/* nav sections */
.nav-group { padding: 0 8px; margin-bottom: 4px; }
.nav-group-label { padding: 10px 8px 5px; }

.nav-item {
  display: flex; align-items: center; gap: 9px;
  width: 100%;
  padding: 6px 8px;
  border-radius: var(--r-md);
  color: var(--ink-secondary);
  font-size: var(--fs-sm);
  text-align: left;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.nav-item:hover { background: var(--surface-wash); color: var(--ink); }
.nav-item[aria-current="page"] {
  background: var(--surface-wash-2);
  color: var(--ink);
  font-weight: 600;
}
.nav-item .nav-ico { width: 14px; flex: none; color: var(--ink-muted); }
.nav-item[aria-current="page"] .nav-ico { color: var(--ink); }
.nav-key {
  margin-left: auto;
  font-family: var(--mono); font-size: var(--fs-micro);
  color: var(--ink-muted);
  border: 1px solid var(--hairline);
  border-radius: 3px; padding: 0 4px; min-width: 16px; text-align: center;
}

/* track chips — colour ALWAYS paired with its text label */
.track-chip {
  display: grid;
  grid-template-columns: 3px 1fr auto;
  gap: 9px;
  align-items: center;
  width: 100%;
  padding: 7px 9px 7px 0;
  border-radius: var(--r-md);
  text-align: left;
  transition: background var(--t-fast) var(--ease);
  position: relative;
}
.track-chip:hover { background: var(--surface-wash); }
.track-chip[aria-current="true"] { background: var(--surface-wash-2); }
.track-swatch {
  width: 3px; align-self: stretch; min-height: 26px;
  border-radius: 0 2px 2px 0;
  background: var(--track);
}
.track-chip-name {
  display: block;
  font-size: var(--fs-sm); font-weight: 600; color: var(--ink);
  letter-spacing: -.005em;
}
.track-chip-meta {
  display: block;
  font-size: var(--fs-micro); color: var(--ink-muted); margin-top: 1px;
}
.track-chip-risk {
  font-size: var(--fs-xs); font-weight: 650;
  font-variant-numeric: tabular-nums;
  padding-right: 2px;
}

.rail-foot {
  border-top: 1px solid var(--hairline);
  padding: 10px 14px;
  display: flex; flex-direction: column; gap: 7px;
}
.capacity-mini { display: flex; align-items: center; gap: 8px; }
.capacity-bar {
  flex: 1; height: 4px; border-radius: 2px;
  background: var(--surface-sunken);
  overflow: hidden; display: flex; gap: 2px;
}
.capacity-seg { height: 100%; background: var(--seg); }

/* ---------------- work surface ---------------- */
.work {
  grid-area: work;
  display: grid;
  grid-template-rows: 1fr var(--spine-h);
  min-width: 0; min-height: 0;
  background: var(--plane);
}
.screen {
  min-height: 0;
  overflow-y: auto;
  padding: 22px 26px 30px;
}
.screen-inner { max-width: 1560px; margin: 0 auto; }

.screen-head { margin-bottom: 20px; }
.screen-head .title-xl { margin-bottom: 5px; }
.screen-head .lede { font-size: var(--fs-base); color: var(--ink-secondary); max-width: 74ch; }

/* ---------------- time spine ---------------- */
.spine {
  border-top: 1px solid var(--hairline);
  background: var(--surface);
  padding: 0 26px;
  display: flex; align-items: center; gap: 18px;
  min-width: 0;
}
.spine-label { flex: none; }
.spine-track {
  flex: 1 1 auto; min-width: 0;
  height: 100%;
  position: relative;
  cursor: ew-resize;
  display: flex; align-items: center;
}
.spine-axis {
  position: absolute; left: 0; right: 0; top: 50%;
  height: 1px; background: var(--hairline-strong);
}
.spine-tick {
  position: absolute; top: 50%; transform: translate(-50%, -50%);
  display: flex; flex-direction: column; align-items: center; gap: 0;
}
.spine-tick-mark { width: 1px; height: 7px; background: var(--hairline-strong); }
.spine-tick-label {
  position: absolute; top: 11px;
  font-size: var(--fs-micro); color: var(--ink-muted);
  white-space: nowrap; font-variant-numeric: tabular-nums;
}
.spine-event {
  position: absolute; top: 50%; transform: translate(-50%, -50%);
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--track);
  box-shadow: 0 0 0 2px var(--surface);
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease);
}
.spine-event:hover { transform: translate(-50%, -50%) scale(1.5); }
.spine-now {
  position: absolute; top: 8px; bottom: 8px;
  width: 1px; background: var(--ink);
  transform: translateX(-.5px);
}
.spine-now::before {
  content: "NOW";
  position: absolute; top: -1px; left: 4px;
  font-size: 8.5px; font-weight: 700; letter-spacing: .08em;
  color: var(--ink);
}
.spine-cursor {
  position: absolute; top: 0; bottom: 0; width: 1px;
  background: var(--t1); opacity: 0; pointer-events: none;
}
.spine-track:hover .spine-cursor { opacity: .55; }

/* ---------------- trust rail ---------------- */
.trust {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: var(--trust-w); max-width: 92vw;
  background: var(--surface);
  box-shadow: var(--shadow-rail);
  z-index: 60;
  display: flex; flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--t-base) var(--ease);
}
.trust[data-open="true"] { transform: none; }
.trust-head {
  padding: 14px 16px 12px;
  border-bottom: 1px solid var(--hairline);
  display: flex; align-items: flex-start; gap: 10px;
}
.trust-body { flex: 1 1 auto; min-height: 0; overflow-y: auto; padding: 4px 16px 24px; }
.trust-foot {
  border-top: 1px solid var(--hairline);
  padding: 11px 16px;
  display: flex; gap: 8px;
}

.trust-section { padding: 15px 0 3px; }
.trust-section + .trust-section { border-top: 1px solid var(--hairline); }

.kv { display: grid; grid-template-columns: 108px 1fr; gap: 4px 12px; align-items: baseline; }
.kv dt { font-size: var(--fs-xs); color: var(--ink-muted); }
.kv dd { font-size: var(--fs-sm); color: var(--ink); }

/* lineage path */
.lineage-path { display: flex; flex-direction: column; gap: 0; margin-top: 4px; }
.lineage-node {
  display: grid; grid-template-columns: 15px 1fr; gap: 10px;
  padding: 6px 0;
  position: relative;
}
.lineage-rail-col { display: flex; flex-direction: column; align-items: center; }
.lineage-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--surface); border: 1.5px solid var(--hairline-strong);
  flex: none; margin-top: 4px;
}
.lineage-node[data-layer="gold"] .lineage-dot { background: var(--t1); border-color: var(--t1); }
.lineage-line { width: 1px; flex: 1; background: var(--hairline); min-height: 8px; }
.lineage-node:last-child .lineage-line { display: none; }
.lineage-name { font-size: var(--fs-sm); font-weight: 550; }
.lineage-meta { font-size: var(--fs-micro); color: var(--ink-muted); }

/* scrim */
.scrim {
  position: fixed; inset: 0;
  background: rgba(11, 11, 11, .18);
  opacity: 0; pointer-events: none;
  transition: opacity var(--t-base) var(--ease);
  z-index: 55;
}
.scrim[data-open="true"] { opacity: 1; pointer-events: auto; }

/* ---------------- command palette ---------------- */
.palette-scrim {
  position: fixed; inset: 0; z-index: 90;
  background: rgba(11,11,11,.28);
  display: grid; place-items: start center;
  padding-top: 14vh;
}
.palette {
  width: min(560px, 92vw);
  background: var(--surface-raised);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-pop);
  overflow: hidden;
  animation: fade-up 180ms var(--ease) both;
}
.palette-input {
  width: 100%; padding: 14px 16px;
  font-size: var(--fs-md);
  border-bottom: 1px solid var(--hairline);
}
.palette-input::placeholder { color: var(--ink-muted); }
.palette-list { max-height: 320px; overflow-y: auto; padding: 6px; }
.palette-item {
  width: 100%; display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: var(--r-md);
  font-size: var(--fs-sm); text-align: left;
}
.palette-item[data-active="true"] { background: var(--surface-wash-2); }
.palette-item .muted { margin-left: auto; font-size: var(--fs-xs); }

/* ---------------- responsive ---------------- */
@media (max-width: 1180px) {
  :root { --rail-w: 200px; --trust-w: 340px; }
  .screen { padding: 18px 18px 26px; }
  .spine { padding: 0 18px; }
}
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; grid-template-areas: "topbar" "work"; }
  .brand, .rail { display: none; }
}