:root {
  box-sizing: border-box;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
html {
  scroll-padding-top: env(safe-area-inset-top, 0px);
}
body {
  margin: 0;
  padding: 0;
}
img {
  max-width: 100%;
}
[hidden]:not([hidden=until-found i]) {
  display: none !important;
}

/* Layout: lab bench — control strip, 3-up specimen grid, magnified strip, then the worked math (block inspector, cost table, formulas), notes. Single committed dark look so imagery reads true. */
:root {
  --bg: #0e0d12;
  --panel: #16141c;
  --line: #2b2833;
  --fg: #ece8f2;
  --muted: #9b94a9;
  --accent: #f2b44c;
  --accent-ink: #1a1408;
  --meta: #7fb2ff;
  --code: #f2b44c;
  --f-display: "Bricolage Grotesque", "Avenir Next", system-ui, sans-serif;
  --f-body: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  color-scheme: dark;
}
html, body {
  background: var(--bg);
  color: var(--fg);
}
body {
  font-family: var(--f-body);
  font-size: 15px;
  line-height: 1.55;
}
.wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding-block: 28px 64px;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  display: grid;
  gap: 36px;
}
header {
  display: grid;
  gap: 8px;
  max-width: 72ch;
}
h1 {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.05;
  margin: 0;
  letter-spacing: -.01em;
  text-wrap: balance;
}
h2 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 24px;
  margin: 0;
  text-wrap: balance;
}
h3 {
  margin: 0;
}
header p, .lede {
  margin: 0;
  color: var(--muted);
  max-width: 72ch;
}
.eyebrow {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
}
section {
  display: grid;
  gap: 14px;
  min-width: 0;
}
.sechead {
  display: grid;
  gap: 6px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 28px;
  align-items: end;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}
.ctl {
  display: grid;
  gap: 6px;
  min-width: 0;
}
.lbl {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
.ctl output {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
}
input[type=range] {
  width: 180px;
  accent-color: var(--accent);
}
.seg {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.seg button {
  font: 500 13px var(--f-body);
  background: transparent;
  color: var(--muted);
  border: 0;
  padding: 7px 12px;
  cursor: pointer;
}
.seg button + button {
  border-left: 1px solid var(--line);
}
.seg button[aria-pressed=true] {
  background: var(--accent);
  color: var(--accent-ink);
}
.btn {
  font: 500 13px var(--f-body);
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 12px;
  cursor: pointer;
}
.btn:hover, .seg button:hover {
  border-color: var(--accent);
}
button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.hint {
  font-size: 13px;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
@media (max-width: 980px) {
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 620px) {
  .grid {
    grid-template-columns: minmax(0, 1fr);
  }
}
.card {
  display: grid;
  gap: 10px;
  align-content: start;
  min-width: 0;
}
.card canvas {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
  background: #000;
  cursor: crosshair;
}
.head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}
.name {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 18px;
}
.tag {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--accent);
  white-space: nowrap;
}
.analog {
  margin: 0;
  font-size: 13.5px;
  color: var(--muted);
}
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  border-top: 1px solid var(--line);
  padding-top: 8px;
}
.stats div {
  display: grid;
  gap: 2px;
  min-width: 0;
}
.stats span {
  font-size: 10.5px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
.stats b {
  font-weight: 500;
  font-size: 14px;
}

.legend {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--muted);
}
.legend i {
  display: block;
  width: 180px;
  height: 10px;
  border-radius: 2px;
}

.strip {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
}
@media (max-width: 820px) {
  .strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.strip figure {
  margin: 0;
  display: grid;
  gap: 4px;
  min-width: 0;
}
.strip canvas {
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  image-rendering: pixelated;
  border-radius: 4px;
  background: #000;
  max-width: 100%;
}
.strip figcaption {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--muted);
}

/* math */
.mono {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
}
.eq {
  font-family: var(--f-mono);
  font-size: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 14px;
  overflow-x: auto;
  white-space: pre;
  line-height: 1.7;
}
.eq .c {
  color: var(--code);
}
.eq .m {
  color: var(--meta);
}
.eq .dim {
  color: var(--muted);
}
.vars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 6px 24px;
  font-size: 14px;
  color: var(--muted);
}
.vars b {
  font-family: var(--f-mono);
  color: var(--fg);
  font-weight: 500;
  margin-right: 6px;
}
.methods {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 28px;
}
@media (max-width: 860px) {
  .methods {
    grid-template-columns: minmax(0, 1fr);
  }
}
.method {
  display: grid;
  gap: 8px;
  align-content: start;
  min-width: 0;
}
.method h3 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 18px;
}
.method p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}
.method p b {
  color: var(--fg);
  font-weight: 500;
}

.tablewrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
}
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px;
  min-width: 720px;
}
th, td {
  padding: 9px 12px;
  text-align: right;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
th:first-child, td:first-child {
  text-align: left;
}
thead th {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 400;
  background: var(--panel);
}
tbody td {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
}
tbody td:first-child {
  font-family: var(--f-body);
}
tbody tr:last-child td {
  border-bottom: 0;
}
tr.ref td {
  color: var(--muted);
}
td .sub {
  display: block;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--f-body);
}

.inspector {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 24px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}
@media (max-width: 900px) {
  .inspector {
    grid-template-columns: minmax(0, 1fr);
  }
}
.kv {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 16px;
  font-size: 14px;
  align-content: start;
}
.kv dt {
  color: var(--muted);
}
.kv dd {
  margin: 0;
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.layout {
  display: flex;
  height: 34px;
  border-radius: 6px;
  overflow: hidden;
  font-family: var(--f-mono);
  font-size: 11px;
}
.layout div {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  color: var(--accent-ink);
  white-space: nowrap;
  overflow: hidden;
}
.layout .ls, .layout .lm {
  background: var(--meta);
}
.layout .lm {
  border-left: 1px solid var(--panel);
}
.layout .lc {
  background: var(--code);
  border-left: 1px solid var(--panel);
}
.bits {
  font-family: var(--f-mono);
  font-size: 13px;
  overflow-wrap: anywhere;
  line-height: 1.8;
}
.bits span:nth-child(odd) {
  color: var(--code);
}
.bits span:nth-child(even) {
  color: var(--fg);
}
.inspector table {
  min-width: 560px;
  font-size: 13px;
}
.inspector .tablewrap {
  background: var(--bg);
}

.prose {
  display: grid;
  gap: 10px;
  max-width: 72ch;
  font-size: 14.5px;
  color: var(--muted);
}
.prose p {
  margin: 0;
}
.prose strong {
  color: var(--fg);
  font-weight: 500;
}

.notes {
  display: grid;
  gap: 10px;
  max-width: 72ch;
  font-size: 14px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
.notes p {
  margin: 0;
}
.notes strong {
  color: var(--fg);
  font-weight: 500;
}

/* microscope */
.scope-head {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: end;
  justify-content: space-between;
}
.mrow {
  display: grid;
  gap: 10px;
  padding-block: 18px;
  border-top: 1px solid var(--line);
}
.mrow-head {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  align-items: baseline;
}
.mrow-head .name {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 18px;
}
.mrow-head .meta {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.trio {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
@media (max-width: 780px) {
  .trio {
    grid-template-columns: minmax(0, 1fr);
  }
}
.mat {
  margin: 0;
  display: grid;
  gap: 6px;
  min-width: 0;
  max-width: 440px;
}
.mat figcaption {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}
.mat figcaption .lbl {
  color: var(--fg);
}
.copy {
  font: 500 11px var(--f-mono);
  letter-spacing: .04em;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 3px 8px;
  cursor: pointer;
}
.copy:hover {
  color: var(--fg);
  border-color: var(--accent);
}
.cells {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
  background: #000;
  padding: 2px;
  border-radius: 4px;
}
.cell {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.05;
  align-items: center;
  justify-content: center;
  font-family: var(--f-mono);
  font-size: clamp(9px, 1vw, 12px);
  font-variant-numeric: tabular-nums;
  border-radius: 1px;
  min-width: 0;
  overflow: hidden;
}
.foot {
  margin: 0;
  font-size: 12.5px;
  color: var(--muted);
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.side {
  display: grid;
  gap: 10px;
  align-content: start;
  font-size: 14px;
  color: var(--muted);
  grid-column: span 2;
  max-width: 62ch;
}
@media (max-width: 780px) {
  .side {
    grid-column: auto;
  }
}
.side p {
  margin: 0;
}
.side b {
  color: var(--fg);
  font-weight: 500;
}
.fallback {
  width: 100%;
  min-height: 90px;
  font: 12px var(--f-mono);
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 6px;
}
.swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  vertical-align: -1px;
  margin-right: 4px;
}

.arith {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--fg);
  overflow-wrap: anywhere;
}
.arith .c {
  color: var(--code);
}
.arith .m {
  color: var(--meta);
}
.arith .dim {
  color: var(--muted);
}
.metawrap {
  display: grid;
  gap: 8px;
  min-width: 0;
}
.strips {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
}
.mblock {
  display: grid;
  gap: 6px;
  min-width: 0;
}
.bytes {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}
.byte {
  display: grid;
  gap: 3px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: help;
  background: var(--bg);
  transition: opacity .15s;
}
.byte .hex, .byte .who {
  font: 11px var(--f-mono);
  color: var(--muted);
  text-align: center;
}
.byte .hex {
  color: var(--fg);
}
.bitrow {
  display: flex;
  gap: 1px;
}
.bitrow i {
  font-style: normal;
  width: 13px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font: 11px var(--f-mono);
  border-radius: 2px;
}
.b-sign {
  background: #3a3546;
  color: #ece8f2;
}
.b-exp {
  background: #2f5c9e;
  color: #fff;
}
.b-man {
  background: #9cc3ff;
  color: #000;
}
.b-tag {
  background: var(--accent);
  color: #000;
}
.byte:hover, .byte:focus-visible {
  border-color: var(--fg);
  outline: none;
}
.byte.hl {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}
.byte.dim {
  opacity: .4;
}
.explain {
  margin: 0;
  font-size: 13.5px;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  min-height: 3.4em;
  max-width: 90ch;
}
.legend-fields {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 12px;
  color: var(--muted);
}
.cell[data-mid] {
  cursor: pointer;
}
.cell[data-mid]:hover {
  filter: brightness(1.25);
}
.cell.hl {
  box-shadow: inset 0 0 0 2px #fff, 0 0 0 2px var(--accent);
  position: relative;
  z-index: 1;
}
.cell.nb {
  box-shadow: inset 0 0 0 2px var(--accent);
}
.eqpanel {
  display: grid;
  gap: 6px;
  min-width: 0;
}
.eqpanel .eq b {
  color: var(--fg);
  font-weight: 500;
}
.eqpanel .eq .c {
  color: var(--code);
}
.eqpanel .eq .m {
  color: var(--meta);
}
.halves {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.half {
  display: grid;
  gap: 6px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  transition: opacity .15s;
  min-width: 0;
}
.half.hl {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}
.half.dim {
  opacity: .4;
}
.fields {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: start;
}
.hname {
  font: 500 15px var(--f-mono);
  color: var(--meta);
  padding-top: 1px;
  min-width: 2.2em;
}
.fld {
  display: grid;
  gap: 3px;
  justify-items: center;
}
.fb {
  display: flex;
  gap: 1px;
}
.fb i {
  font-style: normal;
  width: 13px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font: 11px var(--f-mono);
  border-radius: 2px;
}
.fl {
  font: 11px var(--f-mono);
  color: var(--muted);
  text-align: center;
  max-width: 150px;
}
.hdec {
  font: 13px var(--f-mono);
  color: var(--fg);
  font-variant-numeric: tabular-nums;
}
.hdec .dim {
  color: var(--muted);
}
.note {
  margin: 0;
  font-size: 13.5px;
  color: var(--muted);
  max-width: 80ch;
}
.note b {
  color: var(--fg);
  font-weight: 500;
}
.llm {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  max-width: 90ch;
}
.llm b {
  color: var(--fg);
  font-weight: 500;
}
.llm .lbl {
  color: var(--accent);
  margin-right: 6px;
}

.cell .v {
  font-size: inherit;
}
.cell .bn {
  font-size: clamp(6.5px, .6vw, 8.5px);
  opacity: .72;
  letter-spacing: -.02em;
  text-align: center;
}
.bitmap {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 20px;
  align-items: start;
}
@media (max-width: 780px) {
  .bitmap {
    grid-template-columns: minmax(0, 1fr);
  }
}
.bitmap canvas {
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: 6px;
  cursor: crosshair;
  display: block;
}
.bmside {
  display: grid;
  gap: 8px;
  min-width: 0;
}
.bmrow {
  display: flex;
  gap: 8px;
  align-items: baseline;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--muted);
}
.bmrow b {
  font-family: var(--f-mono);
  font-weight: 500;
  color: var(--fg);
  min-width: 4.5em;
}

.ctxrow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 200px));
  gap: 14px;
}
@media (max-width: 620px) {
  .ctxrow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.ctx {
  margin: 0;
  display: grid;
  gap: 6px;
  min-width: 0;
  justify-items: start;
  font: 12px var(--f-mono);
  color: var(--muted);
  text-align: left;
}
.ctx canvas {
  width: 100%;
  height: auto;
  max-width: 100%;
  image-rendering: pixelated;
  border-radius: 4px;
  display: block;
  background: #000;
}
button.ctx {
  background: transparent;
  border: 0;
  padding: 0;
  cursor: pointer;
}
button.ctx canvas {
  outline: 2px solid transparent;
  outline-offset: 2px;
}
button.ctx:hover canvas {
  outline-color: var(--line);
}
button.ctx[aria-pressed=true] canvas {
  outline-color: var(--accent);
}
button.ctx[aria-pressed=true] span {
  color: var(--accent);
}

.cells.dense .cell {
  font-size: clamp(7px, .72vw, 10px);
}
.cells.dense .bn {
  display: none;
}
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}