/* ---- kernel zoo: opened from the terminal ("zoo") or the "see why" link
   that appears next to a bench result. Owns its file so index.html stays
   a two-line change; reuses the site palette. ---- */

.zoo {
  position: fixed;
  z-index: 45;
  inset: 0;
  display: flex;
  flex-direction: column;
  margin: auto;
  width: min(70rem, calc(100vw - 2rem));
  height: min(51rem, calc(100vh - 2.5rem));
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  box-shadow: 0 24px 64px rgba(23, 21, 15, 0.28);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 200ms ease, transform 200ms ease, visibility 200ms;
}

.zoo.open {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.zoo-bar {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.7rem 0.6rem 0.7rem 1.1rem;
  border-bottom: 1px solid var(--line);
  flex: none;
}

.zoo-title {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.zoo-chapter {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.zoo-close {
  margin-left: auto;
  padding: 0.15rem 0.5rem;
  border: 0;
  border-radius: 6px;
  background: none;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  line-height: 1.5;
}

.zoo-close:hover,
.zoo-close:focus-visible {
  background: var(--surface);
  color: var(--ink);
  outline: none;
}

.zoo-close:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.zoo-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding: 0.85rem 1.1rem 0;
  flex: none;
}

.zoo-tab {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.42rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.78rem;
}

.zoo-tab em {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.64rem;
  font-style: normal;
  letter-spacing: 0.06em;
}

.zoo-tab[aria-selected="true"] {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--bg);
}

.zoo-tab[aria-selected="true"] em {
  color: var(--accent-fill);
}

.zoo-tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.zoo-tag {
  margin: 0.85rem 1.1rem 0;
  color: var(--muted);
  font-family: var(--serif);
  font-size: 0.98rem;
  flex: none;
}

.zoo-body {
  flex: 1;
  min-height: 0;
  padding: 1.1rem 1.1rem 0.4rem;
  overflow-y: auto;
}

.zoo-body::-webkit-scrollbar {
  width: 8px;
}

.zoo-body::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 4px;
}

.zoo-scene {
  display: none;
}

.zoo-scene.on {
  display: block;
}

.zoo-note {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.6;
}

.zoo-scene-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.05rem;
}

.zoo-btn {
  padding: 0.34rem 0.78rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-size: 0.76rem;
}

.zoo-btn:hover,
.zoo-btn:focus-visible {
  border-color: var(--ink);
  outline: none;
}

.zoo-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.zoo-btn.on {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--bg);
}

.zoo-btn-group {
  display: inline-flex;
  gap: 0;
}

.zoo-btn-group .zoo-btn {
  border-radius: 0;
}

.zoo-btn-group .zoo-btn:first-child {
  border-radius: 999px 0 0 999px;
}

.zoo-btn-group .zoo-btn:last-child {
  border-radius: 0 999px 999px 0;
  border-left: 0;
}

.zoo-counters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
  margin-top: 1.05rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.76rem;
}

.zoo-counters strong {
  color: var(--ink);
  font-weight: 600;
}

.zoo-said {
  margin: 0.95rem 0 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.02rem;
  line-height: 1.5;
}

.zoo-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.1rem 0.95rem;
  border-top: 1px solid var(--line);
  flex: none;
}

.zoo-foot-note {
  color: var(--muted);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
}

/* ---- scene 1: the race ---- */

.zoo-race {
  display: grid;
  gap: 0.7rem;
}

.zoo-lane {
  display: grid;
  grid-template-columns: minmax(9rem, 12rem) auto minmax(8rem, 10rem);
  gap: 0.4rem 1.3rem;
  align-items: center;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  background: color-mix(in srgb, white 35%, transparent);
}

.zoo-lane-head {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.zoo-lane-head strong {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 600;
}

.zoo-lane-sub {
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.4;
}

.zoo-badge {
  display: inline-block;
  max-width: 100%;
  padding: 0.12rem 0.45rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: normal;
}

.zoo-badge.zo-bad-measured {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line-strong));
  color: var(--accent);
}

.zoo-badge.zo-bad-schematic {
  border-style: dashed;
}

.zoo-lane canvas {
  display: block;
  width: 168px;
  height: 168px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 30%, var(--bg));
}

.zoo-lane-stats {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-family: var(--mono);
  font-size: 0.74rem;
}

.zoo-lane-stats .zo-speed {
  font-weight: 600;
}

.zoo-lane.zo-done .zo-status {
  color: var(--accent);
}

/* ---- scene 2: inside the scalar machine ---- */

.zsc-svg {
  display: block;
  width: 100%;
  max-width: 46rem;
  height: auto;
  margin: 0 auto;
}

.zsc-svg .z-chip rect {
  fill: var(--bg);
  stroke: var(--line-strong);
  stroke-width: 1;
}

.zsc-svg .z-chip text {
  fill: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  text-anchor: middle;
}

.zsc-svg .z-chip.on rect {
  fill: color-mix(in srgb, var(--accent) 12%, var(--bg));
  stroke: var(--accent);
}

.zsc-svg .z-chip.on text {
  fill: var(--ink);
}

.zsc-svg .z-wire {
  stroke: var(--line);
  stroke-width: 1;
  fill: none;
}

.zsc-svg .z-wire.hot {
  stroke: var(--accent);
}

.zsc-svg .z-pipe rect {
  fill: var(--ink);
}

.zsc-svg .z-pipe text {
  fill: var(--bg);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-anchor: middle;
}

.zsc-svg .z-pipe .z-pipe-sub {
  fill: #c9c2b2;
  font-size: 9px;
  font-weight: 400;
}

.zsc-svg .z-pipe.hot rect {
  fill: var(--accent);
}

.zsc-svg .z-cell rect {
  fill: var(--surface);
  stroke: var(--line);
  stroke-width: 1;
}

.zsc-svg .z-cell.lit rect {
  fill: color-mix(in srgb, var(--accent) 26%, var(--surface));
  transition: fill 160ms ease;
}

.zsc-svg .z-cell.hot rect {
  fill: var(--accent-fill);
  transition: fill 60ms ease;
}

.zsc-svg .z-reg rect {
  fill: var(--bg);
  stroke: var(--line-strong);
  stroke-width: 1;
}

.zsc-svg .z-reg.hot rect {
  fill: var(--accent-fill);
  stroke: var(--accent);
}

.zsc-svg .z-lab {
  fill: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.zsc-svg .z-mem rect {
  fill: none;
  stroke: var(--line-strong);
  stroke-dasharray: 3 3;
}

.zsc-svg .z-mem text {
  fill: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  text-anchor: middle;
}

.zsc-svg .z-mem.wire {
  stroke: var(--line-strong);
  stroke-dasharray: 3 3;
  fill: none;
}

/* ---- scene 3: an SVE vector ---- */

.zve-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 1.4rem 2.2rem;
  align-items: start;
}

.zve-col-label {
  margin: 0 0 0.55rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.zve-strip,
.zve-ghost-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
}

.zve-strip .zo-cell,
.zve-ghost-strip .zo-cell {
  display: grid;
  place-items: center;
  width: 1.65rem;
  height: 1.65rem;
  border: 1px solid var(--line-strong);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.58rem;
}

.zve-strip .zo-cell.on {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--bg));
  color: var(--ink);
}

.zve-strip .zo-cell.cur {
  border-color: var(--accent);
  background: var(--accent-fill);
  color: #f7f4ee;
}

.zve-ghost {
  margin-top: 1.6rem;
  padding-top: 1.05rem;
  border-top: 1px dashed var(--line);
}

.zve-ghost-strip .zo-cell.cur {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--bg);
}

.zve-ghost-strip .zo-cell.done {
  border-color: var(--line-strong);
  background: var(--surface);
}

.zve-vs {
  margin: 0.85rem 0 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.zve-vs strong {
  color: var(--ink);
}

.zve-regs {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.zve-reg {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: center;
}

.zve-reg > span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.68rem;
  text-align: right;
}

.zve-lanes {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
}

.zve-lanes .zo-lane {
  height: 1.65rem;
  flex: 1 0 1.65rem;
  max-width: 2.2rem;
  border: 1px solid var(--line-strong);
}

.zve-lanes .zo-lane.on {
  background: color-mix(in srgb, var(--accent) 18%, var(--bg));
  border-color: var(--accent);
}

.zve-lanes .zo-lane.pulse {
  background: var(--accent-fill);
}

.zve-lanes .zo-lane.off {
  border-style: dashed;
  opacity: 0.55;
}

.zve-p0 .zo-lane {
  height: 0.9rem;
}

.zve-disasm {
  margin: 1.15rem 0 0;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.78rem;
  overflow-wrap: anywhere;
}

.zve-disasm i {
  color: var(--muted);
  font-style: normal;
}

.zve-tail {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

/* ---- "see why" link after a bench result ---- */

.zoo-why {
  padding: 0;
  border: 0;
  background: none;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.84rem;
  min-height: 2.85rem;
  align-self: center;
  text-decoration: underline dotted;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.24em;
}

.zoo-why:hover,
.zoo-why:focus-visible {
  color: var(--accent);
  outline: none;
}

@media (max-width: 760px) {
  .zoo {
    width: calc(100vw - 1.5rem);
    height: calc(100vh - 1.5rem);
  }

  .zoo-body {
    padding: 1rem 0.9rem 0.4rem;
  }

  .zoo-lane {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .zve-wrap {
    grid-template-columns: 1fr;
  }
}