/* Wyndral — monochrome signal dashboard. One accent: #FFD60A, always with ink text on it. */

:root {
  --bg: #FAFAFA;
  --panel: #FFFFFF;
  --ink: #0A0A0A;
  --muted: #5F6368;
  --line: #E6E6E6;
  --field: #8A8A8A;
  --soft: #F2F2F2;
  --signal: #FFD60A;
  --on-ink: #FFFFFF;
  --on-ink-muted: #A6A6A6;
  --r: 8px;
  --f-sans: "Onest", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --f-mono: "Martian Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --wrap: 1240px;
  --gut: clamp(16px, 4vw, 32px);
  --hd-h: 64px;
  color-scheme: light;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--hd-h) + 16px);
}

body {
  margin: 0;
  position: relative;
  isolation: isolate;
  background-color: var(--bg);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--f-sans);
  overflow-x: hidden;
}

/* faint engineering grid */
body::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: .55;
}

img, svg { display: block; max-width: 100%; }
h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; }
b { font-weight: 600; }

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px var(--signal);
  border-radius: 4px;
}

.wrap {
  width: 100%;
  max-width: calc(var(--wrap) + var(--gut) * 2);
  margin: 0 auto;
  padding: 0 var(--gut);
}

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

.skip {
  position: absolute;
  left: var(--gut);
  top: -60px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--signal);
  color: var(--ink);
  font: 600 14px/1 var(--f-sans);
  border-radius: var(--r);
  text-decoration: none;
}
.skip:focus { top: 12px; }

/* ---------- type ---------- */

h1 {
  font-weight: 650;
  font-size: clamp(2.5rem, 5.4vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -.042em;
}
h1 span { display: block; }

h2 {
  font-weight: 650;
  font-size: clamp(1.85rem, 3.5vw, 3rem);
  line-height: 1.06;
  letter-spacing: -.035em;
  text-wrap: balance;
}

h3 {
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.25;
  letter-spacing: -.015em;
}

h4 {
  font-weight: 600;
  font-size: 1.0625rem;
  line-height: 1.3;
  letter-spacing: -.01em;
}

mark {
  background: var(--signal);
  color: var(--ink);
  padding: 0 .12em;
  border-radius: 6px;
  white-space: nowrap;
}

.tag {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  font: 500 11.5px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ink);
}
.tag > i {
  flex: none;
  width: 10px; height: 10px;
  background: var(--signal);
  border: 1.5px solid var(--ink);
  border-radius: 2px;
}
.tag-meta {
  font: 400 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
}
.tag .tag-meta { display: inline-flex; align-items: center; gap: 10px; }
.tag .tag-meta::before {
  content: "";
  width: 28px; height: 1px;
  background: var(--muted);
}

.chip {
  display: inline-block;
  padding: 3px 7px;
  background: var(--signal);
  color: var(--ink);
  font: 500 11px/1.3 var(--f-mono);
  letter-spacing: .02em;
  border-radius: 4px;
  white-space: nowrap;
}

/* ---------- buttons & links ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 20px;
  border: 1.5px solid var(--ink);
  border-radius: var(--r);
  background: var(--ink);
  color: var(--on-ink);
  font: 600 15px/1.2 var(--f-sans);
  letter-spacing: -.005em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .15s, color .15s;
}
.btn:hover { background: var(--signal); color: var(--ink); }
.btn:disabled { cursor: progress; background: var(--muted); border-color: var(--muted); color: var(--on-ink); }
.btn-ghost { background: var(--panel); color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--on-ink); }
.btn-sm { min-height: 40px; padding: 8px 16px; font-size: 14px; }
.btn-block { width: 100%; }

.link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: 600 15px/1.3 var(--f-sans);
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 5px;
}
.link:hover { text-decoration-color: var(--signal); text-decoration-thickness: 4px; }
.link-inline { font-weight: 600; text-underline-offset: 3px; }

/* ---------- header ---------- */

.hd {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 250, .94);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.hd-in {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: var(--hd-h);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font: 700 20px/1 var(--f-sans);
  letter-spacing: -.03em;
  margin-right: auto;
}
.brand-mark { width: 30px; height: 30px; }

.nav { display: flex; align-items: center; gap: 28px; }
.nav ul { display: flex; gap: 22px; }
.nav ul a {
  font: 500 15px/1 var(--f-sans);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}
.nav ul a:hover { border-bottom-color: var(--signal); }

.burger {
  display: none;
  width: 44px; height: 44px;
  padding: 0;
  border: 1.5px solid var(--ink);
  border-radius: var(--r);
  background: var(--panel);
  cursor: pointer;
  position: relative;
}
.burger span {
  position: absolute;
  left: 11px; right: 11px;
  height: 2px;
  background: var(--ink);
  transition: transform .2s, top .2s;
}
.burger span:first-child { top: 16px; }
.burger span:last-child { top: 24px; }
.nav-open .burger span:first-child { top: 20px; transform: rotate(45deg); }
.nav-open .burger span:last-child { top: 20px; transform: rotate(-45deg); }

/* ---------- hero ---------- */

.hero { padding: clamp(40px, 7vw, 96px) 0 clamp(64px, 8vw, 112px); }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
.hero-copy .tag { margin-bottom: 22px; }
.hero h1 { margin-bottom: 24px; }
.lede {
  max-width: 34em;
  font-size: clamp(1.0625rem, 1.4vw, 1.1875rem);
  color: var(--muted);
}
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 32px 0 40px; }

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
}
.stats > div {
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-end;
  gap: 6px;
  padding: 16px 16px 0 0;
}
.stats > div + div { padding-left: 16px; border-left: 1px solid var(--line); }
.stats dt {
  font: 400 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
}
.stats dd {
  font: 600 clamp(1.4rem, 2.4vw, 2rem)/1.1 var(--f-mono);
  letter-spacing: -.04em;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* trace panel */
.trace {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: 0 1px 0 var(--line), 0 28px 56px -36px rgba(10, 10, 10, .35);
  overflow: hidden;
}
.trace-hd, .trace-ft {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  font: 400 11px/1.4 var(--f-mono);
  letter-spacing: .03em;
  color: var(--muted);
}
.trace-hd { border-bottom: 1px solid var(--line); text-transform: uppercase; }
.trace-ft { border-top: 1px solid var(--line); }
.trace-live { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); white-space: nowrap; }
.trace-live i { width: 8px; height: 8px; background: var(--signal); border: 1.5px solid var(--ink); border-radius: 2px; }
.trace-live b { font-weight: 600; font-variant-numeric: tabular-nums; }

.pipe { width: 100%; height: auto; padding: 4px 8px; }
.pipe .guide { fill: none; stroke: var(--line); stroke-width: 1; stroke-dasharray: 2 4; }
.pipe .rail { fill: none; stroke: var(--ink); stroke-width: 2; }
.pipe .packet { fill: none; stroke: var(--signal); stroke-width: 6; stroke-dasharray: .05 .95; display: none; }
.pipe .node { fill: var(--ink); stroke: var(--ink); stroke-width: 1.5; }
.pipe .node-act { fill: var(--signal); stroke-width: 2; }
.pipe .nm { font-family: var(--f-sans); font-weight: 600; font-size: 19px; letter-spacing: -.01em; fill: var(--ink); }
.pipe .ro { font-family: var(--f-mono); font-size: 11px; fill: var(--muted); }
.pipe .ro-chip { fill: var(--ink); font-weight: 500; }
.pipe .chip-bg { fill: var(--signal); }
.pipe .span { fill: none; stroke: var(--ink); stroke-width: 10; }
.pipe .span-under { stroke-width: 12; }
.pipe .span-act { stroke: var(--signal); stroke-width: 8; }

/* stage timing: one stage every .8s */
.pipe .s1 { --s: .2s; }
.pipe .s2 { --s: 1s; }
.pipe .s3 { --s: 1.8s; }
.pipe .s4 { --s: 2.6s; }
.pipe .s5 { --s: 3.4s; }
.pipe .l1 { --s: .55s; }
.pipe .l2 { --s: 1.35s; }
.pipe .l3 { --s: 2.15s; }
.pipe .l4 { --s: 2.95s; }

/* ---------- sections ---------- */

.sec { padding: clamp(72px, 9vw, 128px) 0; }
.band {
  background: var(--panel);
  border-block: 1px solid var(--line);
}

.sec-hd {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 24px 48px;
  align-items: end;
  margin-bottom: clamp(36px, 5vw, 56px);
}
.sec-hd .tag { margin-bottom: 18px; }
.sec-lede { color: var(--muted); max-width: 36em; }

.sub { margin-top: clamp(64px, 8vw, 104px); }
.sub-hd { margin-bottom: 28px; }
.sub-hd .tag { margin-bottom: 14px; }
.sub-hd h3 { font-size: clamp(1.5rem, 2.4vw, 2rem); font-weight: 650; letter-spacing: -.03em; line-height: 1.12; }

/* ---------- formats ---------- */

.formats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.fmt {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  transition: border-color .15s;
}
.fmt:hover { border-color: var(--ink); }
.fmt figure { border-bottom: 1px solid var(--line); background: var(--panel); }
.fmt img { width: 100%; height: auto; }
.fmt-body { display: flex; flex-direction: column; gap: 10px; padding: 20px 20px 22px; flex: 1; }
.fmt-k {
  display: flex;
  align-items: center;
  gap: 10px;
  font: 400 11px/1.4 var(--f-mono);
  color: var(--muted);
}
.fmt-body > p:not(.fmt-k):not(.fmt-where) { color: var(--muted); font-size: 15.5px; line-height: 1.55; }
.fmt-where {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font: 400 11px/1.5 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--ink);
}

/* ---------- factory ---------- */

.tiles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
}
.tiles > div {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px;
}
.tiles > div + div { border-left: 1px solid var(--line); }
.tiles dt {
  font: 400 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
}
.tiles dd {
  font: 600 clamp(1.5rem, 2.6vw, 2.25rem)/1.1 var(--f-mono);
  letter-spacing: -.045em;
  white-space: nowrap;
}
.tiles .tile-d {
  font: 400 15px/1.5 var(--f-sans);
  letter-spacing: 0;
  white-space: normal;
  color: var(--muted);
}

.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-top: 48px;
  position: relative;
}
.steps li {
  position: relative;
  padding: 28px 20px 0 0;
  border-top: 2px solid var(--ink);
}
.steps li::before {
  content: "";
  position: absolute;
  top: -7px; left: 0;
  width: 12px; height: 12px;
  background: var(--panel);
  border: 2px solid var(--ink);
  border-radius: 3px;
}
.steps li:last-child::before { background: var(--signal); }
.step-n {
  display: block;
  margin-bottom: 8px;
  font: 500 11px/1 var(--f-mono);
  color: var(--muted);
}
.steps h3 { font-size: 1.0625rem; margin-bottom: 6px; }
.steps p { font-size: 15px; line-height: 1.5; color: var(--muted); }

.factory-split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 16px;
  margin-top: 56px;
  align-items: stretch;
}

.inside {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: clamp(24px, 3vw, 36px);
  background: var(--ink);
  color: var(--on-ink);
  border-radius: var(--r);
}
.tag-inv { color: var(--on-ink); }
.tag-inv > i { border-color: var(--signal); }
.inside h3 { font-size: clamp(1.5rem, 2.4vw, 2rem); font-weight: 650; letter-spacing: -.03em; line-height: 1.1; }
.inside > p { color: var(--on-ink-muted); }
.roles { margin-top: auto; border-top: 1px solid #2A2A2A; }
.roles li {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid #2A2A2A;
  font-size: 15px;
  color: var(--on-ink-muted);
}
.roles span {
  font: 500 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--on-ink);
}
.roles li:last-child span { color: var(--signal); }

/* batch planner */
.planner {
  padding: clamp(22px, 3vw, 32px);
  background: var(--panel);
  border: 1.5px solid var(--ink);
  border-radius: var(--r);
}
.planner-hd {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.pl-label {
  display: block;
  margin-bottom: 8px;
  font: 500 15px/1.4 var(--f-sans);
}

#batch {
  --p: 33.333%;
  -webkit-appearance: none;
  appearance: none;
  display: block;
  width: 100%;
  height: 32px;
  margin: 0;
  background: transparent;
  cursor: pointer;
}
#batch:focus-visible { outline-offset: 4px; }
#batch::-webkit-slider-runnable-track {
  height: 10px;
  border: 1.5px solid var(--ink);
  border-radius: 5px;
  background: linear-gradient(to right, var(--signal) var(--p), var(--soft) var(--p));
}
#batch::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px; height: 24px;
  margin-top: -8.5px;
  border: 3px solid var(--panel);
  border-radius: 6px;
  background: var(--ink);
  box-shadow: 0 0 0 1.5px var(--ink);
}
#batch::-moz-range-track {
  height: 7px;
  border: 1.5px solid var(--ink);
  border-radius: 5px;
  background: var(--soft);
}
#batch::-moz-range-progress {
  height: 7px;
  border: 1.5px solid var(--ink);
  border-radius: 5px 0 0 5px;
  background: var(--signal);
}
#batch::-moz-range-thumb {
  width: 18px; height: 18px;
  border: 3px solid var(--panel);
  border-radius: 6px;
  background: var(--ink);
  box-shadow: 0 0 0 1.5px var(--ink);
}

.pl-scale {
  display: flex;
  justify-content: space-between;
  margin-top: 4px;
  padding: 0 4px;
  font: 400 10.5px/1 var(--f-mono);
  color: var(--muted);
}

.cells {
  display: grid;
  grid-template-columns: repeat(20, minmax(0, 1fr));
  gap: 3px;
  margin: 22px 0 20px;
}
.cells i {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
  transition: background-color .12s, border-color .12s;
}
.cells i.on { background: var(--ink); border-color: var(--ink); }

.readout { border-top: 1px solid var(--line); }
.readout > div {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.readout dt {
  font: 400 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
}
.readout dd {
  font: 500 14px/1.4 var(--f-mono);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.readout-total { border-bottom: 0 !important; }
.pl-eur {
  display: inline-block;
  padding: 6px 12px;
  background: var(--signal);
  color: var(--ink);
  border-radius: var(--r);
  font: 600 clamp(1.15rem, 2vw, 1.5rem)/1.2 var(--f-mono);
  letter-spacing: -.03em;
}
.pl-note { margin: 12px 0 20px; font-size: 14px; color: var(--muted); }

/* ---------- playbooks ---------- */

.plays {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.play {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: border-color .15s;
}
.play:hover { border-color: var(--ink); }
.play-cat {
  font: 500 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  padding-bottom: 20px;
}
.play-metric {
  font: 600 clamp(1.6rem, 2.5vw, 2.1rem)/1.1 var(--f-mono);
  letter-spacing: -.05em;
}
.play-metric::after {
  content: "";
  display: block;
  width: 44px; height: 6px;
  margin-top: 12px;
  background: var(--signal);
  border: 1px solid var(--ink);
  border-radius: 2px;
}
.play-cap {
  font: 400 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
}
.play h3 { margin: 18px 0 20px; font-size: 1.125rem; }
.play .link { margin-top: auto; font-size: 14.5px; }
.sec-cta { margin-top: 32px; }

/* ---------- services: spec sheet ---------- */

.sheet-wrap, .board-wrap {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.sheet, .board {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}
.sheet caption {
  caption-side: top;
  text-align: left;
  padding: 14px 20px;
  border-bottom: 1px solid var(--ink);
  font: 500 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.sheet thead th, .board thead th {
  padding: 12px 20px;
  border-bottom: 1px solid var(--line);
  font: 400 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
}
.sheet tbody > tr > * {
  padding: 26px 20px;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.sheet tbody > tr:last-child > * { border-bottom: 0; }
.sheet .sheet-u {
  width: 128px;
  font: 400 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
}
.sheet .sheet-u b {
  display: block;
  margin-bottom: 6px;
  font: 600 1.375rem/1 var(--f-mono);
  letter-spacing: -.04em;
  color: var(--ink);
}
.sheet tbody th {
  width: 22%;
  font: 600 1.1875rem/1.3 var(--f-sans);
  letter-spacing: -.015em;
}
.sheet tbody td:nth-child(3) { width: 34%; color: var(--muted); font-size: 15.5px; }
.sheet tbody td:nth-child(3) p { margin-bottom: 14px; }
.sheet .link { font-size: 14px; }

.kv > div {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  gap: 12px;
  padding: 7px 0;
  border-bottom: 1px dashed var(--line);
}
.kv > div:first-child { padding-top: 0; }
.kv > div:last-child { border-bottom: 0; padding-bottom: 0; }
.kv dt { font: 500 11.5px/1.6 var(--f-mono); }
.kv dd { font-size: 14.5px; line-height: 1.45; color: var(--muted); }

/* measurement chain */
.flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}
.flow li { position: relative; padding: 42px 24px 0 0; }
/* one connector segment per step: node centre to next node centre */
.flow li:not(:last-child)::before,
.flow li:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 12px;
  right: -12px;
}
.flow li:not(:last-child)::before { top: 11px; height: 2px; background: var(--ink); }
.flow li:not(:last-child)::after {
  top: 9px;
  height: 6px;
  background: var(--signal);
  border-block: 1px solid var(--ink);
  transform-origin: left center;
}
.flow-node {
  position: absolute;
  top: 0; left: 0;
  z-index: 1;
  width: 24px; height: 24px;
  background: var(--ink);
  border: 2px solid var(--ink);
  border-radius: 5px;
}
.flow li:last-child .flow-node { background: var(--signal); }
.flow-k {
  display: block;
  margin-bottom: 6px;
  font: 500 11px/1 var(--f-mono);
  color: var(--muted);
}
.flow h4 { font-size: 1.25rem; margin-bottom: 6px; }
.flow p { font-size: 15px; line-height: 1.5; color: var(--muted); max-width: 18em; }

/* loop */
.loop {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.loop > li {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.loop-k {
  font: 500 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.loop h4 { font-size: 1.1875rem; }
.loop > li > p:not(.loop-k) { font-size: 15px; line-height: 1.55; color: var(--muted); }
.ticks { margin-top: auto; padding-top: 12px; border-top: 1px dashed var(--line); }
.ticks li {
  position: relative;
  padding: 4px 0 4px 18px;
  font-size: 14.5px;
  line-height: 1.45;
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 0; top: .78em;
  width: 7px; height: 7px;
  background: var(--ink);
  border-radius: 1px;
}

/* add-ons */
.addons { border-top: 1px solid var(--ink); }
.addons li {
  display: grid;
  grid-template-columns: 148px minmax(0, 4fr) minmax(0, 7fr);
  gap: 8px 24px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.addon-k {
  justify-self: start;
  padding: 3px 7px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  font: 500 10.5px/1.3 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.addons h4 { font-size: 1.125rem; }
.addons p { color: var(--muted); font-size: 15.5px; }

/* ---------- about ---------- */

.about {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 48px clamp(32px, 5vw, 80px);
  align-items: start;
}
.about-lead .tag { margin-bottom: 18px; }
.about-lead h2 { margin-bottom: 20px; }
.principles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.principles li {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.pr-n {
  align-self: flex-start;
  min-width: 34px;
  padding: 5px 6px;
  border: 1.5px solid var(--ink);
  border-radius: 4px;
  font: 600 11px/1 var(--f-mono);
  text-align: center;
}
.principles li:last-child .pr-n { background: var(--signal); }
.principles h3 { font-size: 1.1875rem; }
.principles p { color: var(--muted); font-size: 15.5px; }

/* ---------- stack board ---------- */

.board tbody > tr > * {
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  vertical-align: baseline;
}
.board tbody > tr:last-child > * { border-bottom: 0; }
.board tbody tr:hover { background: var(--bg); }
.board-id {
  width: 96px;
  font: 400 11px/1.4 var(--f-mono);
  color: var(--muted);
  white-space: nowrap;
}
.board tbody th { font: 600 1.0625rem/1.3 var(--f-sans); width: 22%; }
.board tbody td:nth-child(3) {
  width: 22%;
  font: 400 11.5px/1.5 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.board tbody td:nth-child(4) { color: var(--muted); }
.board-ms { box-shadow: inset 4px 0 0 var(--signal); }
.board-ms > * { border-top: 1px solid var(--ink); }
.board-ms .board-id { color: var(--ink); }

/* ---------- faq ---------- */

.faq {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: 40px clamp(32px, 5vw, 80px);
  align-items: start;
}
.faq-lead .tag { margin-bottom: 18px; }
.faq-lead h2 { margin-bottom: 18px; }
.qa { border-top: 1px solid var(--ink); }
.qa details { border-bottom: 1px solid var(--line); }
.qa summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  font: 600 1.125rem/1.35 var(--f-sans);
  letter-spacing: -.01em;
}
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after {
  content: "+";
  flex: none;
  display: grid;
  place-items: center;
  width: 30px; height: 30px;
  border: 1.5px solid var(--ink);
  border-radius: 6px;
  font: 500 16px/1 var(--f-mono);
  transition: background-color .15s;
}
.qa details[open] summary::after { content: "−"; background: var(--signal); }
.qa summary:hover::after { background: var(--signal); }
.qa details p { padding: 0 48px 22px 0; color: var(--muted); max-width: 44em; }

/* ---------- contact ---------- */

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px clamp(32px, 5vw, 80px);
  align-items: start;
}
.contact-lead .tag { margin-bottom: 18px; }
.contact-lead h2 { margin-bottom: 20px; }
.facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 32px 0 28px;
  border-top: 1px solid var(--ink);
}
.facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 16px 16px 0;
  border-bottom: 1px solid var(--line);
  font: 400 11px/1.4 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
}
.facts li:nth-child(even) { padding-left: 16px; border-left: 1px solid var(--line); }
.facts b {
  font: 600 1.5rem/1.1 var(--f-mono);
  letter-spacing: -.04em;
  text-transform: none;
  color: var(--ink);
}

.form-panel {
  padding: clamp(22px, 3vw, 32px);
  background: var(--panel);
  border: 1.5px solid var(--ink);
  border-radius: var(--r);
  box-shadow: 0 28px 56px -40px rgba(10, 10, 10, .4);
}
.form-hd {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding-bottom: 14px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.field { margin-bottom: 16px; }
.field label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
  font: 500 15px/1.4 var(--f-sans);
}
.req {
  font: 400 10.5px/1 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
}
.field input, .field textarea {
  display: block;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--field);
  border-radius: var(--r);
  background: var(--panel);
  color: var(--ink);
  font: 400 16px/1.4 var(--f-sans);
  transition: border-color .15s, box-shadow .15s;
}
.field textarea { resize: vertical; min-height: 120px; }
.field input::placeholder, .field textarea::placeholder { color: var(--muted); opacity: 1; }
.field input:hover, .field textarea:hover { border-color: var(--ink); }
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--ink);
  box-shadow: 0 0 0 3px var(--signal);
}
.field input:focus-visible, .field textarea:focus-visible { border-radius: var(--r); }

.hp {
  position: absolute;
  left: -9999px;
  width: 1px; height: 1px;
  overflow: hidden;
}

.form-status { min-height: 1.6em; margin-top: 14px; font-size: 15px; font-weight: 500; }
.form-status:empty { min-height: 0; margin-top: 0; }
.form-status.is-error { display: flex; gap: 10px; align-items: baseline; }
.form-status.is-error::before {
  content: "!";
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 20px; height: 20px;
  background: var(--signal);
  border: 1.5px solid var(--ink);
  border-radius: 4px;
  font: 600 12px/1 var(--f-mono);
  transform: translateY(3px);
}
.form-note {
  margin-top: 14px;
  font-size: 14px;
  color: var(--muted);
}

.thanks { padding: 12px 0 4px; }
.thanks:focus { outline: none; box-shadow: none; }
.thanks .tag { margin-bottom: 14px; }
.thanks-t { font: 600 1.375rem/1.35 var(--f-sans); letter-spacing: -.02em; }

/* ---------- footer ---------- */

.ft { border-top: 1px solid var(--ink); background: var(--panel); }
.ft-in {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 6fr) auto;
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 40px;
  align-items: start;
}
.ft-brand p { margin-top: 14px; color: var(--muted); font-size: 15px; max-width: 22em; }
.ft-nav { display: flex; flex-wrap: wrap; gap: 10px 22px; }
.ft-nav a, .ft-end a {
  font: 400 11.5px/1.6 var(--f-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  text-decoration: none;
}
.ft-nav a:hover, .ft-end a:hover { text-decoration: underline; text-decoration-color: var(--ink); text-underline-offset: 4px; }
.ft-end { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }
.ft-end p { font: 400 11.5px/1.6 var(--f-mono); color: var(--muted); }

/* ---------- motion (only when allowed) ---------- */

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }

  .pipe .node { animation: node-on .3s var(--s) both; }
  .pipe .nm, .pipe .ro, .pipe .chip-bg { animation: rise .45s calc(var(--s) + .05s) both cubic-bezier(.2, .7, .2, 1); }
  .pipe .span { stroke-dasharray: 1; animation: draw .5s calc(var(--s) + .1s) both cubic-bezier(.2, .7, .2, 1); }
  .pipe .rail { stroke-dasharray: 1; animation: draw .45s var(--s) both ease-out; }
  .pipe .packet { display: inline; opacity: 0; animation: travel 3.6s 4.4s linear infinite; }

  .trace-live i { animation: blink 1.2s steps(2, jump-none) infinite; }

  .flow.armed li::after { transform: scaleX(0); transition: transform .6s cubic-bezier(.4, 0, .2, 1); }
  .flow.armed .flow-node { background: var(--panel); transition: background-color .2s; }
  .flow.armed li:nth-child(1) .flow-node { transition-delay: .1s; }
  .flow.armed li:nth-child(1)::after { transition-delay: .2s; }
  .flow.armed li:nth-child(2) .flow-node { transition-delay: .8s; }
  .flow.armed li:nth-child(2)::after { transition-delay: .8s; }
  .flow.armed li:nth-child(3) .flow-node { transition-delay: 1.4s; }
  .flow.armed li:nth-child(3)::after { transition-delay: 1.4s; }
  .flow.armed li:nth-child(4) .flow-node { transition-delay: 2s; }
  .flow.armed li:nth-child(4)::after { transition-delay: 2s; }
  .flow.armed li:nth-child(5) .flow-node { transition-delay: 2.6s; }
  .flow.armed.run li::after { transform: scaleX(1); }
  .flow.armed.run .flow-node { background: var(--ink); }
  .flow.armed.run li:last-child .flow-node { background: var(--signal); }
}

@keyframes node-on { from { fill: var(--panel); } }
@keyframes rise { from { opacity: 0; transform: translateY(5px); } }
@keyframes draw { from { stroke-dashoffset: 1; } to { stroke-dashoffset: 0; } }
@keyframes travel {
  0% { stroke-dashoffset: .05; opacity: 1; }
  100% { stroke-dashoffset: -.95; opacity: 1; }
}
@keyframes blink { 50% { opacity: .25; } }

/* ---------- responsive ---------- */

@media (max-width: 1100px) {
  .plays { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .loop { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tiles > div:nth-child(3) { border-left: 0; }
  .tiles > div:nth-child(n+3) { border-top: 1px solid var(--line); }
  .factory-split { grid-template-columns: minmax(0, 1fr); }
  .sheet tbody th { width: auto; }
}

@media (max-width: 980px) {
  .burger { display: block; }
  .js .nav {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
    max-height: calc(100vh - var(--hd-h));
    overflow-y: auto;
    padding: 8px var(--gut) 24px;
    background: var(--panel);
    border-bottom: 1px solid var(--ink);
  }
  .js.nav-open .nav { display: flex; }
  .js .nav ul { flex-direction: column; gap: 0; }
  .js .nav ul a {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
    font-size: 17px;
  }
  .no-js .burger { display: none; }
  .no-js .hd-in { flex-wrap: wrap; padding-top: 12px; padding-bottom: 12px; }
  .no-js .nav { flex-wrap: wrap; gap: 12px; width: 100%; }
  .no-js .nav ul { flex-wrap: wrap; gap: 6px 16px; }

  .hero-grid { grid-template-columns: minmax(0, 1fr); }
  .trace { max-width: 560px; }
  .sec-hd { grid-template-columns: minmax(0, 1fr); }
  .formats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about, .faq, .contact { grid-template-columns: minmax(0, 1fr); }

  .steps { grid-template-columns: minmax(0, 1fr); margin-top: 40px; }
  .steps li {
    padding: 0 0 24px 32px;
    border-top: 0;
    border-left: 2px solid var(--ink);
    margin-left: 6px;
  }
  .steps li:last-child { border-left-color: transparent; padding-bottom: 0; }
  .steps li::before { top: 0; left: -7px; }

  .flow { grid-template-columns: minmax(0, 1fr); }
  .flow li:not(:last-child)::before,
  .flow li:not(:last-child)::after { top: 12px; bottom: -12px; right: auto; height: auto; }
  .flow li:not(:last-child)::before { left: 11px; width: 2px; }
  .flow li:not(:last-child)::after { left: 9px; width: 6px; border-block: 0; border-inline: 1px solid var(--ink); transform-origin: center top; }
  .flow li { padding: 0 0 28px 48px; }
  .flow li:last-child { padding-bottom: 0; }
  .flow p { max-width: none; }

  .ft-in { grid-template-columns: minmax(0, 1fr); }
  .ft-end { align-items: flex-start; }
}

@media (max-width: 980px) and (prefers-reduced-motion: no-preference) {
  .flow.armed li::after { transform: scaleY(0); }
  .flow.armed.run li::after { transform: scaleY(1); }
}

@media (max-width: 820px) {
  /* tables become stacked spec cards */
  .sheet thead, .board thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .sheet, .sheet tbody, .sheet tr, .sheet tbody > tr > * { display: block; width: auto !important; }
  .sheet tbody > tr { padding: 22px 18px; border-bottom: 1px solid var(--line); }
  .sheet tbody > tr:last-child { border-bottom: 0; }
  .sheet tbody > tr > * { padding: 0; border-bottom: 0; }
  .sheet .sheet-u { display: flex; align-items: baseline; gap: 10px; margin-bottom: 8px; }
  .sheet .sheet-u b { margin: 0; }
  .sheet tbody th { margin-bottom: 12px; }
  .sheet tbody td:nth-child(3) { margin-bottom: 18px; }
  .sheet caption { display: block; }

  .board, .board tbody, .board tr { display: block; }
  .board tbody > tr {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 4px 14px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--line);
  }
  .board tbody > tr:last-child { border-bottom: 0; }
  .board tbody > tr > * { padding: 0; border: 0 !important; width: auto !important; }
  .board-id { grid-row: span 3; padding-top: 3px !important; }
  .board-ms { box-shadow: inset 4px 0 0 var(--signal); border-top: 1px solid var(--ink); }

  .addons li { grid-template-columns: minmax(0, 1fr); gap: 8px; }
}

@media (max-width: 640px) {
  body { font-size: 1rem; }
  .formats, .plays, .loop, .principles { grid-template-columns: minmax(0, 1fr); }
  .tiles { grid-template-columns: minmax(0, 1fr); }
  .tiles > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .stats > div { padding-right: 8px; }
  .stats > div + div { padding-left: 10px; }
  .stats dt { font-size: 10px; }
  .cta-row .btn { flex: 1 1 auto; }
  .facts { grid-template-columns: minmax(0, 1fr); }
  .facts li:nth-child(even) { padding-left: 0; border-left: 0; }
  .kv > div { grid-template-columns: 92px minmax(0, 1fr); }
  .roles li { grid-template-columns: 92px 1fr; }
  .qa details p { padding-right: 0; }
  .cells { gap: 2px; }
  .trace-hd { font-size: 10px; }
  .pipe .nm { font-size: 22px; }
  .pipe .ro { font-size: 13px; }
}