/* Porterage — an anodized equipment faceplate.
   Nothing floats: every element sits on, in, or beside a machined panel. Lamps and meters change
   state; panels do not move. */

:root {
  accent-color: #ffa51f;
  scrollbar-color: #3a3e43 #101113;
  --panel: #17181a;
  --panel-high: #1f2124;
  --panel-low: #101113;
  --recess: #0b0c0d;
  --edge: #34373b;
  --edge-soft: #26292c;

  /* Both tones clear WCAG AA (4.5:1) against every panel ground here; the small mono
     labels are 10–11px, which makes contrast matter more, not less. */
  --label: #9aa0a8;
  --label-dim: #888d95;
  --text: #d7dbe0;
  --text-bright: #f2f4f6;

  --signal: #ffa51f;
  --signal-deep: #c97a05;
  --signal-ghost: rgba(255, 165, 31, 0.14);
  --ok: #5cc47d;
  --alarm: #e4544a;

  --rule: 1px solid var(--edge-soft);
  --wrap: 1160px;
  --gut: clamp(20px, 5vw, 64px);

  --mono: "Azeret Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --sans: "Archivo", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;

  color-scheme: dark;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--panel);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  /* Brushed metal: fine vertical grain plus a slow horizontal light gradient across the panel. */
  background-image:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.014) 0 1px, transparent 1px 3px),
    linear-gradient(100deg, #141517 0%, #1a1c1f 42%, #141517 100%);
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--text-bright); }

.skip {
  position: absolute;
  left: -9999px;
  background: var(--signal);
  color: #16181a;
  padding: 10px 16px;
  font-family: var(--mono);
  font-size: 12px;
}
.skip:focus { left: 12px; top: 12px; z-index: 20; }

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

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

/* The signal path: one continuous line running the height of the document, so the page reads as a
   single routed panel rather than stacked cards. */
.rail {
  position: fixed;
  inset-block: 0;
  left: max(14px, calc((100vw - var(--wrap)) / 2 - 26px));
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--edge) 8%, var(--edge) 92%, transparent);
  z-index: 0;
  pointer-events: none;
}
@media (max-width: 900px) { .rail { display: none; } }

.panel {
  position: relative;
  border-bottom: var(--rule);
  padding-block: clamp(56px, 8vw, 104px);
  z-index: 1;
}
.panel--head { padding-block: clamp(44px, 6vw, 72px) 0; }
.panel--chain { background: var(--panel-low); }
.panel--limits { background: var(--panel-low); }
.panel--foot { border-bottom: 0; padding-block: 40px; }

/* Screen-printed labels ------------------------------------------------- */

.stencil {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--label-dim);
  margin: 0 0 14px;
}

.brand {
  font-size: clamp(52px, 9vw, 104px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 0.92;
  margin: 0;
  color: var(--text-bright);
  /* Engraved: a dark cut above, a lit machined edge below. */
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.8), 0 -1px 0 rgba(255, 255, 255, 0.07);
}
.brand--sm { font-size: 28px; letter-spacing: -0.02em; }

.model {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--label);
  margin: 14px 0 0;
}

/* Head ------------------------------------------------------------------ */

.head {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.85fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
  padding-bottom: clamp(40px, 6vw, 72px);
}

.lede {
  max-width: 46ch;
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.55;
  color: var(--text);
  margin: 26px 0 0;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.plate-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 15px 22px;
  background: linear-gradient(180deg, var(--signal) 0%, var(--signal-deep) 100%);
  color: #14161a;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.01em;
  border: 1px solid #8f5a04;
  border-radius: 2px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45), 0 2px 0 #000;
  transition: transform 0.08s linear, box-shadow 0.08s linear;
}
.plate-btn:hover { box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6), 0 2px 0 #000, 0 0 22px rgba(255, 165, 31, 0.28); }
.plate-btn:active { transform: translateY(2px); box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3), 0 0 0 #000; }
.plate-btn__lamp {
  width: 8px; height: 8px; border-radius: 50%;
  background: #2a1a00;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.5), 0 0 8px rgba(255, 240, 200, 0.8);
  background-image: radial-gradient(circle, #fff6df 0%, #ffcf72 60%, #b77300 100%);
}
.plate-btn__meta {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: rgba(18, 20, 24, 0.88);
}
.plate-btn--sm { padding: 12px 18px; font-size: 15px; }
.plate-btn__text { white-space: nowrap; }

.ghost-btn {
  display: inline-flex;
  align-items: center;
  padding: 15px 22px;
  border: 1px solid var(--edge);
  border-radius: 2px;
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  background: linear-gradient(180deg, var(--panel-high), var(--panel-low));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
.ghost-btn:hover { border-color: var(--label-dim); color: var(--text-bright); }

.caveat {
  display: flex;
  align-items: baseline;
  gap: 9px;
  margin: 24px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--label);
}
.caveat a { color: var(--label); text-underline-offset: 3px; }
.caveat a:hover { color: var(--signal); }

.dot {
  width: 7px; height: 7px; border-radius: 50%;
  display: inline-block;
  flex: none;
  transform: translateY(-1px);
}
.dot--alarm { background: var(--alarm); box-shadow: 0 0 8px rgba(228, 84, 74, 0.55); }
.dot--ok { background: var(--ok); box-shadow: 0 0 8px rgba(92, 196, 125, 0.5); }

/* Gauge ----------------------------------------------------------------- */

.gauge {
  background: linear-gradient(180deg, var(--recess), #0e0f11);
  border: 1px solid var(--edge-soft);
  border-radius: 3px;
  padding: 22px 22px 18px;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.75);
}
.gauge__label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--label-dim);
  margin: 0 0 16px;
}

/* The ladder: every cell is drawn, lit or not. An unreached cell is the scale, not an absence. */
.ladder {
  display: grid;
  grid-template-columns: repeat(24, 1fr);
  gap: 3px;
  height: 46px;
}
.ladder span {
  background: var(--signal-ghost);
  border-radius: 1px;
  transform-origin: bottom;
}
.ladder span.lit {
  background: linear-gradient(180deg, #ffd487, var(--signal));
  box-shadow: 0 0 10px rgba(255, 165, 31, 0.45);
}

/* The scale the ghost cells belong to, so an unlit cell reads as headroom rather than a gap. */
.gauge__scale {
  display: flex;
  justify-content: space-between;
  margin: 9px 0 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--label-dim);
}

.gauge__read {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 18px 0 0;
  font-family: var(--mono);
  color: var(--signal);
}
.gauge__read strong { font-size: 46px; font-weight: 500; letter-spacing: -0.03em; line-height: 1; }
.gauge__read em { font-style: normal; font-size: 13px; letter-spacing: 0.12em; color: var(--label); }
.gauge__foot {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--label);
  border-top: var(--rule);
  padding-top: 12px;
}

/* Spec row -------------------------------------------------------------- */

.specrow { border-top: var(--rule); background: var(--panel-low); }
.specrow__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.spec {
  padding: 26px 0 26px 24px;
  border-left: var(--rule);
  margin-left: -1px;
}
.spec:first-child { border-left: 0; padding-left: 0; margin-left: 0; }
.spec__k {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--label-dim);
  margin: 0 0 10px;
}
.spec__v {
  font-family: var(--mono);
  font-size: 32px;
  font-weight: 500;
  letter-spacing: -0.03em;
  color: var(--text-bright);
  margin: 0;
  line-height: 1;
}
.spec__v em { font-style: normal; font-size: 14px; color: var(--label); margin-left: 3px; }
.spec__n { margin: 10px 0 0; font-size: 13px; color: var(--label); line-height: 1.45; }

/* Section heads --------------------------------------------------------- */

.sechead { max-width: 62ch; margin-bottom: clamp(38px, 5vw, 58px); }
.sechead h2 {
  font-size: clamp(30px, 4.2vw, 46px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.08;
  margin: 0;
  color: var(--text-bright);
}
.sechead__sub { margin: 18px 0 0; color: var(--label); font-size: 16.5px; line-height: 1.6; }

/* Faults ---------------------------------------------------------------- */

.faults { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.fault {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(20px, 3vw, 44px);
  padding-block: clamp(30px, 4vw, 44px);
  border-top: var(--rule);
  align-items: start;
}
.fault:last-child { border-bottom: var(--rule); }
.fault .fault__no {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--signal);
  margin: 6px 0 0;
}
.fault h3 {
  font-size: clamp(20px, 2.3vw, 25px);
  font-weight: 600;
  letter-spacing: -0.018em;
  line-height: 1.22;
  margin: 0 0 14px;
  color: var(--text-bright);
}
.fault p { margin: 0; color: var(--label); line-height: 1.62; font-size: 16px; }
.fault code {
  font-family: var(--mono);
  font-size: 0.88em;
  color: var(--text);
  background: var(--recess);
  padding: 1px 5px;
  border-radius: 2px;
}

.readout {
  background: var(--recess);
  border: 1px solid var(--edge-soft);
  border-radius: 3px;
  padding: 20px;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.6);
}
.readout__row {
  display: grid;
  grid-template-columns: 116px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  margin-bottom: 14px;
}
.readout__k {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--label-dim);
}
.bar { display: block; height: 12px; background: var(--signal-ghost); border-radius: 1px; overflow: hidden; }
.bar i {
  display: block;
  height: 100%;
  width: var(--w);
  background: linear-gradient(180deg, #ffd487, var(--signal));
  box-shadow: 0 0 10px rgba(255, 165, 31, 0.4);
}
.readout__row--bad .bar i { background: linear-gradient(180deg, #f08078, var(--alarm)); box-shadow: 0 0 10px rgba(228, 84, 74, 0.35); }
.readout__v { font-family: var(--mono); font-size: 14px; color: var(--text-bright); white-space: nowrap; }
.readout__v em { font-style: normal; display: block; font-size: 11.5px; color: var(--label-dim); letter-spacing: 0.08em; }
.readout__note {
  margin: 16px 0 0 !important;
  padding-top: 13px;
  border-top: var(--rule);
  font-size: 13px !important;
  color: var(--label-dim) !important;
  line-height: 1.5;
}

.lamps { display: grid; gap: 10px; align-content: start; }
.lamp {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.5;
  padding: 14px 16px;
  border: 1px solid var(--edge-soft);
  border-radius: 3px;
  background: var(--recess);
  color: var(--label) !important;
}
.lamp--ok { border-color: rgba(92, 196, 125, 0.28); }
.lamp--alarm { border-color: rgba(228, 84, 74, 0.28); }

/* Thumbnail chain — three routes tried in order, drawn as the signal path it is. The lamp at each
   tap dims as the route gets rarer: route 1 answers for most files, route 3 for about a seventh. */

.chain {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 34px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 48px);
}
.chain::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 8px;
  height: 1px;
  background: linear-gradient(90deg, var(--signal-deep) 0%, var(--edge) 78%, var(--edge-soft) 100%);
}
.chain__step { position: relative; }
.chain__step::before {
  content: "";
  position: absolute;
  top: -30px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 10px rgba(255, 165, 31, 0.5);
}
.chain__step:nth-child(2)::before { background: var(--signal-deep); box-shadow: 0 0 7px rgba(201, 122, 5, 0.4); }
.chain__step:nth-child(3)::before { background: var(--edge); box-shadow: none; }

.chain__step h3 {
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 600;
  letter-spacing: -0.018em;
  line-height: 1.24;
  margin: 0 0 10px;
  color: var(--text-bright);
}
.chain__step p { margin: 0; color: var(--label); font-size: 15.5px; line-height: 1.6; }

.chain .chain__no {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 12px;
}
.chain__step:nth-child(3) .chain__no { color: var(--label-dim); }

.chain .chain__read {
  margin-top: 16px;
  padding-top: 13px;
  border-top: var(--rule);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--label-dim);
}
.chain .chain__read strong { color: var(--signal); font-weight: 500; font-size: 14px; }

.chain__foot {
  margin: clamp(30px, 4vw, 44px) 0 0;
  padding-top: 18px;
  border-top: var(--rule);
  max-width: 72ch;
  font-size: 15px;
  color: var(--label-dim);
}

/* Cards ----------------------------------------------------------------- */

.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--edge-soft); border: 1px solid var(--edge-soft); border-radius: 3px; }
.card { background: var(--panel); padding: clamp(24px, 3vw, 34px); }
.card .card__k {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 14px;
}
.card h3 {
  font-size: clamp(19px, 2.1vw, 23px);
  font-weight: 600;
  letter-spacing: -0.018em;
  margin: 0 0 12px;
  color: var(--text-bright);
  line-height: 1.22;
}
.card p { margin: 0; color: var(--label); font-size: 15.5px; line-height: 1.6; }
.card__read {
  margin-top: 18px !important;
  padding-top: 14px;
  border-top: var(--rule);
  font-family: var(--mono);
  font-size: 13px !important;
  letter-spacing: 0.04em;
  color: var(--label-dim) !important;
}
.card__read strong { color: var(--text-bright); font-weight: 500; }

/* Conditions ------------------------------------------------------------ */

.conditions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; margin: 0; }
.conditions > div {
  display: grid;
  grid-template-columns: 128px minmax(0, 1fr);
  gap: 20px;
  padding: 18px 0;
  border-top: var(--rule);
}
.conditions dt {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--label-dim);
  padding-top: 3px;
}
.conditions dd { margin: 0; font-size: 15.5px; color: var(--text); line-height: 1.5; }
@media (min-width: 860px) {
  .conditions > div:nth-child(odd) { padding-right: 40px; }
  .conditions > div:nth-child(even) { padding-left: 40px; border-left: var(--rule); margin-left: -1px; }
}

/* Limits ---------------------------------------------------------------- */

.limits { list-style: none; margin: 0; padding: 0; max-width: 78ch; }
.limits li {
  position: relative;
  padding: 20px 0 20px 30px;
  border-top: var(--rule);
  color: var(--label);
  font-size: 16px;
  line-height: 1.6;
}
.limits li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 28px;
  width: 12px;
  height: 1px;
  background: var(--signal);
}
.limits strong { color: var(--text-bright); font-weight: 600; }

/* Foot ------------------------------------------------------------------ */

.foot { display: flex; flex-wrap: wrap; gap: 28px; align-items: center; justify-content: space-between; }
.foot__right { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

/* Narrow ---------------------------------------------------------------- */

@media (max-width: 900px) {
  body { font-size: 16px; }
  .head { grid-template-columns: 1fr; }
  .specrow__grid { grid-template-columns: repeat(2, 1fr); }
  .spec { padding-left: 20px; }
  .spec:nth-child(odd) { border-left: 0; padding-left: 0; margin-left: 0; }
  .spec:nth-child(n + 3) { border-top: var(--rule); }
  .fault { grid-template-columns: 34px minmax(0, 1fr); }
  .fault .readout, .fault .lamps { grid-column: 2; }
  .cards { grid-template-columns: 1fr; }
  .conditions { grid-template-columns: 1fr; }
  /* Stacked, the path turns into a margin of tap points rather than a line across the top. */
  .chain { grid-template-columns: 1fr; gap: 0; padding-top: 0; }
  .chain::before { display: none; }
  .chain__step { padding: 22px 0 24px 26px; border-top: var(--rule); }
  .chain__step::before { top: 26px; left: 0; }
}

@media (max-width: 560px) {
  .readout__row { grid-template-columns: 1fr; gap: 6px; }
  .readout__v { display: flex; align-items: baseline; gap: 6px; }
  .readout__v em { display: inline; }
  .actions { flex-direction: column; align-items: stretch; }
  .plate-btn, .ghost-btn { justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}


.panel--split { background: var(--panel-low); }

/* Split — prose on the left argues, the inventory on the right answers "and what else". */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}
.split__text h2 {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 600;
  letter-spacing: -0.024em;
  line-height: 1.12;
  margin: 0 0 18px;
  color: var(--text-bright);
}
.split__text p { margin: 0 0 16px; color: var(--label); font-size: 16px; line-height: 1.62; }

.minispec { display: grid; gap: 0; margin: 26px 0 0; }
.minispec > div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-top: var(--rule);
}
.minispec dt {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--label-dim);
}
.minispec dd { margin: 0; font-family: var(--mono); font-size: 13px; color: var(--signal); }


/* The inventory column: what is in the window, once the headline claim is made. */
.feats { border-left: var(--rule); padding-left: clamp(20px, 3vw, 34px); }
.feats__k {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 8px;
}
.feats__list { list-style: none; margin: 0; padding: 0; }
.feats__list li {
  position: relative;
  padding: 12px 0 12px 24px;
  border-top: var(--rule);
  color: var(--label);
  font-size: 15.5px;
  line-height: 1.5;
}
.feats__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 11px;
  height: 1px;
  background: var(--signal-deep);
}

@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; }
  .feats { border-left: 0; padding-left: 0; }
}

@media (max-width: 560px) {
  .plate-btn { flex-wrap: wrap; }
  .plate-btn__meta { flex-basis: 100%; }
}


/* Browser surfaces: default blue selection and a system scrollbar undo a committed panel faster
   than any single component does. */
::selection { background: var(--signal); color: #14161a; }
::marker { color: var(--signal); }
input, textarea { caret-color: var(--signal); }

.ghost-btn:active { background: var(--recess); box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.6); }