/* blackhathall.dev
   Palette is taken from a real circuit board: green soldermask, copper traces
   under the mask, white silkscreen, ENIG gold pads, black epoxy chip bodies. */

@font-face {
  font-family: "Archivo";
  src: url("../fonts/archivo-var.woff2") format("woff2");
  font-weight: 400 800;
  font-stretch: 100% 125%;
  font-display: swap;
}
@font-face {
  font-family: "Martian Mono";
  src: url("../fonts/martian-mono-var.woff2") format("woff2");
  font-weight: 400 600;
  font-stretch: 75% 100%;
  font-display: swap;
}

:root {
  --mask: #0d1a14;
  --mask-2: #11221a;
  --mask-3: #163022;
  --trace: #1f3b2c;
  --trace-hi: #2d5741;
  --silk: #eceadf;
  --silk-dim: #a5b7ab;
  --silk-faint: #74897b;
  --gold: #d9a946;
  --gold-hi: #edc36e;
  --gold-ink: #1d1606;
  --epoxy: #131816;
  --epoxy-edge: #2b3530;
  --led-ok: #5fd68b;
  --led-warn: #e9c35a;
  --led-bad: #f0876c;
  --led-off: #33433a;

  --font: "Archivo", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Martian Mono", ui-monospace, "Cascadia Mono", "SF Mono", monospace;
  --wrap: 75rem;
  --pad: clamp(1rem, 4vw, 2.5rem);
  --radius: 4px;
  color-scheme: dark;
}

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

html {
  background: var(--mask);
  color: var(--silk);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 1rem;
}

body {
  margin: 0;
  background: var(--mask);
  font-family: var(--font);
  font-size: 1.125rem;
  font-weight: 400;
  font-stretch: 100%;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
ul, ol { margin: 0; padding: 0; }

h1, h2, h3 {
  margin: 0;
  font-weight: 700;
  text-wrap: balance;
}
h1 {
  font-size: clamp(2.4rem, 1.5rem + 3.6vw, 4.25rem);
  font-stretch: 114%;
  font-weight: 760;
  line-height: 1.02;
  letter-spacing: -0.018em;
}
h2 {
  font-size: clamp(1.75rem, 1.35rem + 1.5vw, 2.5rem);
  font-stretch: 112%;
  line-height: 1.08;
  letter-spacing: -0.012em;
}
h3 {
  font-size: 1.3125rem;
  font-stretch: 106%;
  font-weight: 640;
  line-height: 1.25;
}

a { color: var(--gold-hi); text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
a:hover { color: var(--silk); }

:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection { background: var(--gold); color: var(--gold-ink); }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 50;
  padding: 0.6rem 1rem;
  background: var(--gold);
  color: var(--gold-ink);
  font-weight: 600;
  border-radius: var(--radius);
}
.skip:focus { top: 1rem; }

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

/* ---------- buttons and links ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 3rem;
  padding: 0 1.35rem;
  border-radius: var(--radius);
  font: inherit;
  font-size: 1rem;
  font-weight: 620;
  font-stretch: 108%;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  border: 0;
}
.btn-gold {
  background: var(--gold);
  color: var(--gold-ink);
}
/* the drilled hole of a through-hole pad */
.btn-gold::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--gold-ink);
  box-shadow: 0 0 0 2px rgba(29, 22, 6, 0.18);
}
.btn-gold:hover { background: var(--gold-hi); color: var(--gold-ink); }
.btn-line {
  background: transparent;
  color: var(--silk);
  box-shadow: inset 0 0 0 1.5px var(--trace-hi);
}
.btn-line:hover { color: var(--silk); box-shadow: inset 0 0 0 1.5px var(--gold); }
.btn-sm { min-height: 2.5rem; padding: 0 1rem; font-size: 0.9375rem; }

.btn-mini {
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--silk);
  background: transparent;
  border: 1px solid var(--trace-hi);
  border-radius: var(--radius);
  padding: 0.45rem 0.8rem;
  cursor: pointer;
}
.btn-mini:hover { border-color: var(--gold); }

.text-link {
  display: inline-block;
  font-weight: 620;
  font-stretch: 106%;
  color: var(--gold-hi);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
}

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

.site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--trace);
  background: var(--mask);
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.5rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--silk);
  text-decoration: none;
}
.brand:hover { color: var(--silk); }
.mark { width: 2rem; height: 2rem; flex: none; }
.wordmark {
  font-size: 1.1875rem;
  font-weight: 720;
  font-stretch: 116%;
  letter-spacing: -0.01em;
}
.wordmark span { color: var(--silk-faint); font-weight: 500; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.site-nav ul {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}
.site-nav ul a {
  color: var(--silk-dim);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 520;
  padding-block: 0.4rem;
  border-bottom: 2px solid transparent;
}
.site-nav ul a:hover { color: var(--silk); }
.site-nav ul a[aria-current="page"] { color: var(--silk); border-bottom-color: var(--gold); }

/* small screens: a details/summary menu, so it works without JavaScript */
.mnav { display: none; }
.mnav summary {
  list-style: none;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--silk);
  border: 1px solid var(--trace-hi);
  border-radius: var(--radius);
  padding: 0.5rem 0.9rem;
  cursor: pointer;
}
.mnav summary::-webkit-details-marker { display: none; }
.mnav[open] summary { border-color: var(--gold); }
.mnav-panel {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  padding: 0.5rem var(--pad) 1.5rem;
  background: var(--mask);
  border-bottom: 1px solid var(--trace);
}
.mnav-panel ul { list-style: none; margin-bottom: 1.25rem; }
.mnav-panel ul a {
  display: block;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--trace);
  color: var(--silk);
  text-decoration: none;
  font-size: 1.0625rem;
}
.mnav-panel ul a[aria-current="page"] { color: var(--gold-hi); }
.mnav-panel .btn { width: 100%; justify-content: center; }

@media (max-width: 52rem) {
  .site-nav { display: none; }
  .mnav { display: block; }
}

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

.hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border-bottom: 1px solid var(--trace);
}
.board-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}
.board-bg .tr path { fill: none; stroke: var(--trace); stroke-width: 2.4; stroke-linejoin: round; stroke-linecap: round; }
.board-bg .via circle,
.fan .via circle { fill: var(--mask); stroke: var(--trace-hi); stroke-width: 2.2; }
.board-bg .smd .pad { fill: var(--trace-hi); }
.board-bg .smd .out { fill: none; stroke: var(--silk-faint); stroke-width: 1; opacity: 0.45; }
.board-bg .smd text { font: 500 10px var(--mono); fill: var(--silk-faint); opacity: 0.7; }
.board-bg .fid circle:first-child { fill: var(--trace-hi); }
.board-bg .fid circle:last-child { fill: none; stroke: var(--trace); stroke-width: 1.5; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  padding-block: clamp(3.5rem, 8vw, 7rem);
}
.hero-copy { max-width: 40rem; }
.hero-copy h1 { margin-bottom: 1.5rem; }
.lede {
  font-size: clamp(1.125rem, 1rem + 0.4vw, 1.3125rem);
  line-height: 1.55;
  color: var(--silk);
  max-width: 36em;
  margin-bottom: 2rem;
}
.hero-note {
  margin-top: 1.25rem;
  font-size: 0.9375rem;
  color: var(--silk-dim);
}

/* ---------- the self-test chip ---------- */

.hero-board {
  position: relative;
  justify-self: end;
  width: 100%;
  max-width: 26rem;
}
.fan {
  position: absolute;
  top: 0;
  right: calc(100% + 10px);
  overflow: visible;
  pointer-events: none;
}
.fan .tr path,
.fan .pulse path { fill: none; stroke-width: 2.4; stroke-linejoin: round; stroke-linecap: round; }
.fan .tr path { stroke: var(--trace-hi); }
.fan .pulse path {
  stroke: var(--gold-hi);
  stroke-dasharray: 14 100;
  stroke-dashoffset: 14;
  opacity: 0;
}
.probing .fan .pulse path { animation: signal 1.1s cubic-bezier(.5,0,.6,1) forwards; }
.probing .fan .pulse path:nth-child(2) { animation-delay: 0.12s; }
.probing .fan .pulse path:nth-child(3) { animation-delay: 0.22s; }
.probing .fan .pulse path:nth-child(4) { animation-delay: 0.34s; }
@keyframes signal {
  0% { stroke-dashoffset: 14; opacity: 1; }
  92% { opacity: 1; }
  100% { stroke-dashoffset: -100; opacity: 0; }
}

.chip {
  position: relative;
  background: var(--epoxy);
  border-radius: 6px;
  box-shadow: inset 0 0 0 1px var(--epoxy-edge), 0 18px 40px -18px rgba(0, 0, 0, 0.7);
  padding: 1.6rem 1.6rem 1.3rem;
}
/* gull-wing pins down both long sides */
.chip::before,
.chip::after {
  content: "";
  position: absolute;
  top: 31px;
  bottom: 24px;
  width: 10px;
  background: repeating-linear-gradient(to bottom, var(--gold) 0 6px, transparent 6px 22px);
}
.chip::before { right: 100%; border-radius: 2px 0 0 2px; }
.chip::after { left: 100%; border-radius: 0 2px 2px 0; }
.chip .ref {
  position: absolute;
  top: -1.6rem;
  left: 0;
  font: 500 0.75rem/1 var(--mono);
  font-stretch: 85%;
  color: var(--silk-dim);
}
.chip-dot {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--epoxy-edge);
}
.chip-title {
  font-size: 1.25rem;
  font-stretch: 112%;
  margin-bottom: 0.25rem;
}
.chip-sub {
  font-size: 0.9375rem;
  color: var(--silk-dim);
  margin-bottom: 1.1rem;
}
.checks { margin: 0; }
.check {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.5rem 0;
  border-top: 1px solid var(--epoxy-edge);
  font-size: 0.9375rem;
}
.check dt { display: flex; align-items: center; gap: 0.65rem; }
.check dd {
  margin: 0;
  font: 500 0.8125rem/1.2 var(--mono);
  font-stretch: 85%;
  color: var(--silk-dim);
  white-space: nowrap;
  text-align: right;
}
.led {
  flex: none;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--led-off);
  transition: background-color 0.25s, box-shadow 0.25s;
}
.check.is-ok .led { background: var(--led-ok); box-shadow: 0 0 10px rgba(95, 214, 139, 0.55); }
.check.is-warn .led { background: var(--led-warn); box-shadow: 0 0 10px rgba(233, 195, 90, 0.5); }
.check.is-bad .led { background: var(--led-bad); box-shadow: 0 0 10px rgba(240, 135, 108, 0.5); }
.check.is-ok dd { color: var(--led-ok); }
.check.is-warn dd { color: var(--led-warn); }
.check.is-bad dd { color: var(--led-bad); }

.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 0;
  padding-top: 0.85rem;
  border-top: 1px solid var(--epoxy-edge);
}
.metrics dt { font-size: 0.8125rem; color: var(--silk-dim); }
.metrics dd {
  margin: 0.15rem 0 0;
  font: 500 1.25rem/1.2 var(--mono);
  font-stretch: 80%;
  color: var(--silk);
}
.chip-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.1rem;
  font-size: 0.875rem;
}
.chip-nojs { font-size: 0.875rem; color: var(--silk-dim); margin-top: 0.75rem; }
.js .chip-nojs { display: none; }
.chip-foot [data-selftest-run] { display: none; }
.js .chip-foot [data-selftest-run] { display: inline-block; }

/* ---------- credentials band ---------- */

.creds-band { background: var(--mask-2); }
.creds {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.5rem 2rem;
  list-style: none;
  padding-block: 2.25rem;
}
.creds li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.9375rem;
  line-height: 1.45;
}
.creds li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.32em;
  width: 0.65rem;
  height: 0.8rem;
  border-radius: 2px;
  background: var(--gold);
}
.creds strong {
  display: block;
  font-size: 1.0625rem;
  font-weight: 650;
  font-stretch: 106%;
  margin-bottom: 0.3rem;
}
.creds span { color: var(--silk-dim); }

/* breakaway-tab perforations between board and rail */
.mousebites {
  height: 14px;
  background:
    radial-gradient(circle at center, var(--mask) 3.5px, transparent 4px) 0 50% / 14px 14px repeat-x;
  border-top: 1px solid var(--trace);
}

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

.section { padding-block: clamp(4rem, 9vw, 7.5rem); }
.section-alt { background: var(--mask-2); border-block: 1px solid var(--trace); }
.section-title { margin-bottom: 1rem; max-width: 22ch; }
.section-intro { max-width: 40em; color: var(--silk-dim); margin-bottom: 3rem; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(2rem, 5vw, 5rem);
}
.split-head h2 { margin-bottom: 1rem; }
.split-head p { color: var(--silk-dim); max-width: 30em; }

.branch {
  position: relative;
  padding: 1.6rem 0 1.6rem 1.75rem;
  border-top: 1px solid var(--trace);
}
.branch:last-child { border-bottom: 1px solid var(--trace); }
/* a via where each row's trace starts */
.branch::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2.05rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  border: 2px solid var(--gold);
}
.branch h3 { margin-bottom: 0.5rem; }
.branch h3 a { color: var(--silk); text-decoration: none; }
.branch h3 a:hover { color: var(--gold-hi); }
.branch p { color: var(--silk-dim); max-width: 38em; }
.branch-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  margin-top: 0.75rem;
  font-size: 0.9375rem;
}
.branch-meta span:last-child { color: var(--silk); font-weight: 560; }

/* ---------- feature (Duluth) ---------- */

.feature {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.feature-copy h2 { margin-bottom: 1rem; }
.lede-sm { font-size: 1.1875rem; color: var(--silk); }
.feature-copy p { color: var(--silk-dim); }
.feature-copy .lede-sm { color: var(--silk); }
.fineprint { font-size: 0.875rem; color: var(--silk-faint); }

.map {
  margin: 0;
  background: var(--mask);
  border: 1px solid var(--trace);
  border-radius: 8px;
  overflow: hidden;
}
.map-svg { width: 100%; height: auto; cursor: crosshair; touch-action: manipulation; }
.map-svg .lake { fill: var(--mask-3); }
.map-svg .lake.bay { fill: #13291e; }
.map-svg .streets line { stroke: var(--trace); stroke-width: 1.6; }
.map-svg .hwy { fill: none; stroke: var(--trace-hi); stroke-width: 4; stroke-linejoin: round; }
.map-svg .shore { fill: none; stroke: var(--trace-hi); stroke-width: 1.5; }
.map-svg .spit { fill: var(--mask); stroke: var(--trace-hi); stroke-width: 1.2; }
.map-svg .map-label { font: italic 500 13px var(--font); fill: var(--silk-faint); letter-spacing: 0.04em; }
.map-svg .pin .ring { fill: var(--gold); }
.map-svg .pin .hole { fill: var(--mask); }
.map-svg .pin.is-new { transform-box: fill-box; transform-origin: center; animation: drop 0.35s cubic-bezier(.2,1.4,.4,1); }
.map-svg .pin.is-new .ring { fill: var(--gold-hi); }
@keyframes drop { from { transform: scale(0.2); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.map figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  padding: 0.85rem 1rem;
  border-top: 1px solid var(--trace);
  background: var(--mask-2);
}
.map-readout {
  margin: 0;
  font: 500 0.8125rem/1.4 var(--mono);
  font-stretch: 85%;
  color: var(--silk-dim);
}
[data-map-drop] { display: none; }
.js [data-map-drop] { display: inline-block; }

/* ---------- principles ---------- */

.principles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(2rem, 5vw, 4.5rem);
}
.principles > div {
  padding-block: 1.75rem;
  border-top: 1px solid var(--trace);
}
.principles h3 { margin-bottom: 0.6rem; }
.principles p { color: var(--silk-dim); max-width: 34em; }

/* ---------- test points (process) ---------- */

.tps {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1.5rem;
  list-style: none;
  margin-bottom: 2.5rem;
}
.tps::before {
  content: "";
  position: absolute;
  left: 0.6rem;
  right: 0.6rem;
  top: 0.6rem;
  height: 2.4px;
  background: var(--trace-hi);
}
.tps li { position: relative; padding-top: 2.4rem; }
.tps li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 1.2rem;
  height: 1.2rem;
  border-radius: 50%;
  background: var(--mask-2);
  border: 3px solid var(--gold);
}
.section:not(.section-alt) .tps li::before { background: var(--mask); }
.tp {
  display: block;
  font: 500 0.75rem/1 var(--mono);
  font-stretch: 85%;
  color: var(--silk-dim);
  margin-bottom: 0.6rem;
}
.tps h3 { font-size: 1.125rem; margin-bottom: 0.4rem; }
.tps p { font-size: 0.9375rem; color: var(--silk-dim); }

/* ---------- call to action ---------- */

.cta { padding-block: clamp(4.5rem, 10vw, 8rem); }
.cta-inner > * { max-width: 48rem; }
.cta h2 { font-size: clamp(2rem, 1.4rem + 2.4vw, 3.25rem); margin-bottom: 1.25rem; }
.cta p { color: var(--silk-dim); font-size: 1.1875rem; max-width: 34em; margin-bottom: 2rem; }

/* ---------- inner page header ---------- */

.page-head {
  padding-block: clamp(3.5rem, 8vw, 6rem) clamp(2.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--trace);
}
.page-head h1 { max-width: 16ch; margin-bottom: 1.25rem; }
.page-head .lede { margin-bottom: 0; color: var(--silk-dim); }

/* ---------- work ---------- */

.case {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(1.5rem, 5vw, 4.5rem);
  padding-block: clamp(3.5rem, 7vw, 6rem);
  border-bottom: 1px solid var(--trace);
}
.case:last-of-type { border-bottom: 0; }
.case-side h2 { margin-bottom: 1.25rem; }
.facts { margin: 0; font-size: 0.9375rem; }
.facts div { padding: 0.55rem 0; border-top: 1px solid var(--trace); }
.facts dt { color: var(--silk-faint); font-size: 0.8125rem; }
.facts dd { margin: 0.1rem 0 0; color: var(--silk); }
.status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.status::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--led-ok);
}
.status.is-archived::before { background: var(--silk-faint); }
.status.is-dev::before { background: var(--led-warn); }
.case-body { max-width: 44rem; }
.case-body h3 { margin: 2rem 0 0.6rem; }
.case-body h3:first-child { margin-top: 0; }
.case-body p { color: var(--silk-dim); }
.case-body .lede-sm { color: var(--silk); margin-bottom: 1.5rem; }

/* data-flow sketch: stages joined by a trace */
.flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  list-style: none;
  margin: 1.5rem 0 0.75rem;
  position: relative;
}
.flow::before {
  content: "";
  position: absolute;
  left: 1rem;
  right: 1rem;
  top: 50%;
  height: 2.4px;
  background: var(--trace-hi);
  z-index: 0;
}
.flow li {
  position: relative;
  z-index: 1;
  background: var(--epoxy);
  box-shadow: inset 0 0 0 1px var(--epoxy-edge);
  border-radius: 5px;
  padding: 0.85rem 0.9rem;
  font-size: 0.9375rem;
  line-height: 1.35;
}
.flow li strong { display: block; font-stretch: 106%; font-weight: 640; color: var(--silk); margin-bottom: 0.2rem; }
.flow li span { color: var(--silk-dim); font-size: 0.875rem; }

/* ---------- services ---------- */

.service {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(1.5rem, 5vw, 4.5rem);
  padding-block: clamp(3.5rem, 7vw, 5.5rem);
  border-bottom: 1px solid var(--trace);
}
.service h2 { margin-bottom: 1rem; }
.service-side p { color: var(--silk-dim); }
.range {
  margin-top: 1.75rem;
  padding: 1.1rem 1.25rem;
  background: var(--mask-2);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.range strong {
  display: block;
  font-size: 1.5rem;
  font-stretch: 110%;
  font-weight: 700;
  color: var(--silk);
  line-height: 1.2;
}
.range span { font-size: 0.9375rem; color: var(--silk-dim); }
.fit { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.fit h3 { font-size: 1.0625rem; margin-bottom: 0.75rem; }
.fit ul { list-style: none; }
.fit li {
  position: relative;
  padding: 0.45rem 0 0.45rem 1.35rem;
  color: var(--silk-dim);
  font-size: 1rem;
  border-top: 1px solid var(--trace);
}
.fit li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.95rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--led-ok);
}
.fit .not li::before { background: transparent; border: 1.5px solid var(--silk-faint); }
.stack { margin-top: 1.75rem; font-size: 0.9375rem; color: var(--silk-dim); }
.stack strong { color: var(--silk); font-weight: 600; }

.includes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 2.5rem;
  list-style: none;
}
.includes li {
  padding: 1.1rem 0;
  border-top: 1px solid var(--trace);
  color: var(--silk-dim);
  font-size: 1rem;
}
.includes strong { display: block; color: var(--silk); font-weight: 620; font-stretch: 104%; margin-bottom: 0.2rem; }

.faq { max-width: 50rem; }
.faq details { border-top: 1px solid var(--trace); }
.faq details:last-child { border-bottom: 1px solid var(--trace); }
.faq summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.15rem 0;
  font-size: 1.125rem;
  font-weight: 600;
  font-stretch: 104%;
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  flex: none;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  border: 2px solid var(--gold);
  transition: background-color 0.2s;
}
.faq details[open] summary::after { background: var(--gold); }
.faq details p { color: var(--silk-dim); padding-bottom: 1.25rem; max-width: 42em; }

/* ---------- process page ---------- */

.steps { list-style: none; max-width: 56rem; }
.step {
  position: relative;
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 1rem;
  padding-bottom: 3rem;
}
.step::before {
  content: "";
  position: absolute;
  left: 0.55rem;
  top: 1.4rem;
  bottom: 0;
  width: 2.4px;
  background: var(--trace-hi);
}
.step:last-child::before { display: none; }
.step-pad {
  position: relative;
  width: 1.35rem;
  height: 1.35rem;
  margin-top: 0.3rem;
  border-radius: 50%;
  border: 3px solid var(--gold);
  background: var(--mask);
}
.step-pad span {
  position: absolute;
  left: 2rem;
  top: 0.15rem;
  font: 500 0.75rem/1 var(--mono);
  font-stretch: 85%;
  color: var(--silk-dim);
  white-space: nowrap;
}
.step h2 { font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem); margin-bottom: 0.75rem; }
.step > div > p { color: var(--silk-dim); max-width: 40em; }
.who {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  margin: 1.25rem 0 0;
}
.who div { border-top: 1px solid var(--trace); padding-top: 0.6rem; }
.who dt { font-size: 0.8125rem; color: var(--silk-faint); margin-bottom: 0.2rem; }
.who dd { margin: 0; font-size: 0.9375rem; color: var(--silk-dim); }

.checklist {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 3rem;
  max-width: 64rem;
}
.checklist li {
  display: flex;
  gap: 0.85rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--trace);
  color: var(--silk-dim);
}
.checklist li::before {
  content: "";
  flex: none;
  width: 0.55rem;
  height: 0.55rem;
  margin-top: 0.55em;
  border-radius: 50%;
  background: var(--led-ok);
  box-shadow: 0 0 8px rgba(95, 214, 139, 0.45);
}
.checklist strong { color: var(--silk); font-weight: 600; }

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

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}
.about-side { position: sticky; top: 2rem; }
.portrait { margin: 0 0 1.5rem; }
.portrait img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: 6px;
  background: var(--mask-2);
}
.portrait figcaption { margin-top: 0.75rem; font-size: 0.875rem; color: var(--silk-faint); }
.portrait.is-missing { display: none; }
.about-body { max-width: 42rem; }
.about-body > p { color: var(--silk-dim); }
.about-body > p.lede-sm { color: var(--silk); }
.about-body h2 { font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem); margin: 3rem 0 1rem; }
.skills { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-top: 0.5rem; }
.skills h3 { font-size: 1.0625rem; margin-bottom: 0.6rem; }
.skills ul { list-style: none; }
.skills li { padding: 0.4rem 0; border-top: 1px solid var(--trace); color: var(--silk-dim); font-size: 1rem; }

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

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: clamp(2rem, 6vw, 5.5rem);
  align-items: start;
}
.form-grid { display: grid; gap: 1.5rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.field { display: grid; gap: 0.45rem; }
.field label,
.field legend {
  font-size: 0.9375rem;
  font-weight: 600;
  font-stretch: 104%;
  padding: 0;
}
.field .hint { font-size: 0.875rem; color: var(--silk-faint); font-weight: 400; }
input[type="text"],
input[type="email"],
input[type="url"],
select,
textarea {
  width: 100%;
  font: inherit;
  font-size: 1rem;
  color: var(--silk);
  background: var(--mask-2);
  border: 1px solid var(--trace-hi);
  border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
}
textarea { min-height: 9rem; resize: vertical; line-height: 1.5; }
select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--silk-dim) 50%), linear-gradient(135deg, var(--silk-dim) 50%, transparent 50%);
  background-position: calc(100% - 1.15rem) 55%, calc(100% - 0.8rem) 55%;
  background-size: 0.35rem 0.35rem, 0.35rem 0.35rem;
  background-repeat: no-repeat;
  padding-right: 2.5rem;
}
input:focus, select:focus, textarea:focus { border-color: var(--gold); outline: 2px solid var(--gold); outline-offset: 0; }
::placeholder { color: var(--silk-faint); opacity: 1; }

fieldset.field { border: 0; margin: 0; padding: 0; min-width: 0; }
.options { display: grid; grid-template-columns: 1fr 1fr; gap: 0.6rem; margin-top: 0.15rem; }
.option { position: relative; }
.option input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.option span {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  height: 100%;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--trace-hi);
  border-radius: var(--radius);
  background: var(--mask-2);
  font-size: 0.9375rem;
  line-height: 1.3;
}
.option span::before {
  content: "";
  flex: none;
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
  border: 2px solid var(--silk-faint);
}
.option input:checked + span { border-color: var(--gold); }
.option input:checked + span::before { border-color: var(--gold); background: var(--gold); box-shadow: inset 0 0 0 2px var(--mask-2); }
.option input:focus-visible + span { outline: 2px solid var(--gold-hi); outline-offset: 2px; }
.trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.5rem; }
.form-foot p { font-size: 0.9375rem; color: var(--silk-dim); margin: 0; }
.form-error { color: var(--led-bad); font-size: 0.9375rem; }

.done {
  padding: 2rem;
  background: var(--mask-2);
  border: 1px solid var(--trace);
  border-left: 3px solid var(--led-ok);
  border-radius: 0 6px 6px 0;
}
.done h2 { font-size: 1.75rem; margin-bottom: 0.75rem; }
.done p { color: var(--silk-dim); }
.done .actions { margin-top: 1.25rem; }
.done pre {
  margin: 1.25rem 0 0;
  padding: 1rem;
  max-height: 14rem;
  overflow: auto;
  background: var(--mask);
  border: 1px solid var(--trace);
  border-radius: var(--radius);
  font: 0.8125rem/1.5 var(--mono);
  font-stretch: 85%;
  color: var(--silk-dim);
  white-space: pre-wrap;
}

.aside-block { padding-block: 1.25rem; border-top: 1px solid var(--trace); }
.aside-block:first-child { border-top: 0; padding-top: 0; }
.aside-block h2 { font-size: 1.25rem; margin-bottom: 0.75rem; }
.aside-block p, .aside-block li { color: var(--silk-dim); font-size: 1rem; }
.aside-block ol { padding-left: 1.2rem; display: grid; gap: 0.5rem; }
.aside-block li::marker { color: var(--gold); font-weight: 600; }

/* ---------- 404 ---------- */

.lost { min-height: 60vh; display: grid; align-content: center; padding-block: 5rem; }
.lost h1 { margin-bottom: 1.25rem; max-width: 14ch; }
.lost p { color: var(--silk-dim); max-width: 34em; }
.lost code { font: 0.9em var(--mono); font-stretch: 85%; color: var(--silk); }
.lost .actions { margin-top: 2rem; }

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

.site-footer {
  border-top: 1px solid var(--trace);
  background: var(--mask-2);
  font-size: 0.9375rem;
  color: var(--silk-dim);
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 3fr) minmax(0, 4fr);
  gap: 2rem;
  padding-block: 3rem 2rem;
}
.footer-brand { display: flex; gap: 0.9rem; align-items: flex-start; }
.footer-brand strong { color: var(--silk); font-stretch: 110%; }
.site-footer ul { list-style: none; display: grid; gap: 0.35rem; }
.site-footer a { color: var(--silk); text-decoration-color: var(--trace-hi); }
.site-footer a:hover { color: var(--gold-hi); }
.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  padding-block: 1.25rem 2rem;
  background: linear-gradient(var(--trace), var(--trace)) center top / calc(100% - 2 * var(--pad)) 1px no-repeat;
  font-size: 0.875rem;
  color: var(--silk-faint);
}
.footer-base p { margin: 0; }

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

@media (max-width: 64rem) {
  .creds { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tps { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 2rem; }
  .tps::before { display: none; }
  .includes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 56rem) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-board { justify-self: stretch; max-width: 30rem; padding-inline: 10px; margin-top: 2.25rem; }
  .fan { display: none; }
  .split, .feature, .case, .service, .about-grid, .contact-grid, .footer-grid { grid-template-columns: 1fr; }
  .about-side { position: static; }
  .portrait { max-width: 22rem; }
  .principles { grid-template-columns: 1fr; }
  .checklist { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr 1fr; }
  .flow::before { display: none; }
}

@media (max-width: 38rem) {
  body { font-size: 1.0625rem; }
  .creds { grid-template-columns: 1fr; padding-block: 1.75rem; }
  .tps { grid-template-columns: 1fr; }
  .fit, .skills, .who, .includes, .form-row, .options { grid-template-columns: 1fr; }
  .step { grid-template-columns: 2.5rem minmax(0, 1fr); }
  .step-pad span { display: none; }
  .actions .btn { flex: 1 1 auto; justify-content: center; }
  .chip { padding: 1.3rem 1.2rem 1.1rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .probing .fan .pulse path { animation: none; }
}
.principles-single { grid-template-columns: 1fr; }

/* the fan-in traces need the full desktop gap beside the headline */
@media (max-width: 75rem) {
  .fan { display: none; }
}