/* AIec — engineering-instrumentation design system.
 *
 * Subject: ephemeral, leased, isolated machines. The visual language is
 * measurement, not marketing: a cold paper ground, navy ink, one cobalt
 * signal for live state, rust only for limits and destruction. Colour and
 * rules are spent on the hero lifecycle strip; everything else stays quiet.
 */

:root {
  /* Ground and surfaces */
  --ground: #edf0f4;
  --surface: #ffffff;
  --surface-sunk: #e4e9f0;

  /* Ink */
  --ink: #0f1a2e;
  --ink-soft: #5b6b84;
  --ink-faint: #93a1b6;

  /* Structure */
  --rule: #c9d2e0;
  --rule-firm: #0f1a2e;

  /* Signal: one accent, live state only */
  --signal: #1b44e8;
  --signal-wash: #e4eaff;
  /* Alert: limits, refusal, destruction only */
  --alert: #a83b22;
  --alert-wash: #fbeae5;

  --sans: "Archivo", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --rail: 244px;
  --gutter: 28px;
  --measure: 68ch;
}

* { box-sizing: border-box; }

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--signal); text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre, .mono, .tnum { font-family: var(--mono); }

pre {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--ink);
  border-radius: 2px;
  padding: 18px 20px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.62;
  margin: 0;
}

:not(pre) > code {
  background: var(--surface-sunk);
  border-radius: 2px;
  padding: 1px 5px;
  font-size: 0.9em;
}

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

.masthead {
  border-bottom: 1px solid var(--rule);
  background: var(--ground);
}

.masthead__inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 64px;
}

.wordmark {
  display: flex;
  align-items: baseline;
  gap: 9px;
  color: var(--ink);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.02em;
}
.wordmark:hover { text-decoration: none; }

/* The mark is a leased-machine glyph: a box with a liveness tick. */
.wordmark__mark {
  width: 11px;
  height: 11px;
  border: 2px solid var(--ink);
  position: relative;
  align-self: center;
}
.wordmark__mark::after {
  content: "";
  position: absolute;
  inset: 2px;
  background: var(--signal);
}

.masthead__nav {
  margin-left: auto;
  display: flex;
  gap: 2px;
  flex-wrap: wrap;
}

.masthead__nav a {
  color: var(--ink-soft);
  padding: 7px 11px;
  font-size: 15px;
  font-weight: 450;
  border-bottom: 2px solid transparent;
}
.masthead__nav a:hover {
  color: var(--ink);
  text-decoration: none;
  border-bottom-color: var(--rule);
}
.masthead__nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
  border-bottom-color: var(--signal);
}

/* ----------------------------------------------------------------- shell */

.shell {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: 0 40px;
  align-items: start;
}

/* The telemetry rail: measured facts, set apart from prose. */
.rail {
  position: sticky;
  top: 24px;
  padding: 34px 0 0;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--ink-faint);
  border-right: 1px solid var(--rule);
  padding-right: 30px;
  min-height: 60vh;
}

.rail dl { margin: 0; display: grid; grid-template-columns: 5.6rem 1fr; gap: 3px 12px; align-items: baseline; }
.rail dt { color: var(--ink-faint); }
.rail dd { margin: 0; color: var(--ink); font-weight: 500; }
.rail__group + .rail__group { margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--rule); }
.rail__caption {
  color: var(--ink-faint);
  display: block;
  margin-bottom: 6px;
  letter-spacing: 0.01em;
}

.content {
  padding: 44px 0 96px;
  min-width: 0;
  max-width: var(--measure);
}
.content--wide { max-width: 78ch; }

.content > * + * { margin-top: 22px; }

h1 {
  font-size: clamp(2.1rem, 5.4vw, 3.35rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 700;
  font-stretch: 112%;
  margin: 0;
  max-width: 18ch;
}

h2 {
  font-size: clamp(1.35rem, 2.4vw, 1.7rem);
  line-height: 1.18;
  letter-spacing: -0.022em;
  font-weight: 650;
  margin: 68px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--rule);
  max-width: 26ch;
}

h3 {
  font-size: 1.02rem;
  font-weight: 650;
  letter-spacing: -0.012em;
  margin: 0 0 4px;
}

p { margin: 0; color: var(--ink-soft); }
p + p { margin-top: 16px; }

.lede {
  font-size: 1.16rem;
  line-height: 1.55;
  color: var(--ink);
  max-width: 54ch;
  margin-top: 20px;
}

a strong, strong { color: var(--ink); font-weight: 650; }

ul, ol { margin: 0; padding-left: 1.15em; color: var(--ink-soft); }
li { margin-bottom: 7px; }
li::marker { color: var(--ink-faint); }

/* ------------------------------------------------- measurement rule/ticks */

/* A hairline with real tick marks. Used only where real units are shown. */
.rule {
  height: 9px;
  border-bottom: 1px solid var(--rule-firm);
  background-image: linear-gradient(to right, var(--rule-firm) 1px, transparent 1px);
  background-size: 10% 100%;
  background-position: bottom left;
  background-repeat: repeat-x;
  margin: 8px 0 0;
}

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

/* The one memorable element: a leased machine's whole life, with its real
 * resource draw, in a single orchestrated read-out. */
.lifecycle {
  margin: 34px 0 0;
  border: 1px solid var(--rule-firm);
  background: var(--surface);
}

.lifecycle__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-soft);
}

.lifecycle__state {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-weight: 500;
}

.lifecycle__pulse {
  width: 8px;
  height: 8px;
  background: var(--signal);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

.lifecycle__track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stage {
  padding: 16px;
  border-right: 1px solid var(--rule);
  position: relative;
}
.stage:last-child { border-right: 0; }

/* Stage progress is drawn on the stage's own top edge. */
.stage::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  height: 3px;
  background: var(--signal);
  width: var(--progress, 0%);
}

.stage__name {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-faint);
  display: block;
  margin-bottom: 6px;
}

.stage__value {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  display: block;
}

.stage__unit {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-soft);
  display: block;
  margin-top: 5px;
}

.stage--spent { color: var(--alert); }
.stage--spent .stage__value { color: var(--alert); }
.stage--spent::before { background: var(--alert); }

/* The hero typesets its own code as the design element, not a neutral box. */
.specimen {
  margin: 30px 0 0;
  font-size: 1.02rem;
  line-height: 1.7;
  letter-spacing: -0.005em;
}
.specimen .kw { color: var(--signal); font-weight: 600; }
.specimen .fn { color: var(--ink); font-weight: 600; }
.specimen .str { color: var(--alert); }
.specimen .cm { color: var(--ink-faint); }

/* ------------------------------------------------------------------ actions */

.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 30px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  font-weight: 600;
  font-size: 15.5px;
  border: 1.5px solid var(--ink);
  border-radius: 2px;
  color: var(--ink);
  background: transparent;
}
.btn:hover { text-decoration: none; background: var(--ink); color: var(--surface); }
.btn--solid { background: var(--ink); color: var(--surface); }
.btn--solid:hover { background: var(--signal); border-color: var(--signal); }
.btn:focus-visible { outline: 3px solid var(--signal); outline-offset: 2px; }

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

/* ------------------------------------------------------------------ blocks */

/* Information blocks, not a card kit: one rule, no radius, no shadow. */
.block {
  border-top: 1px solid var(--rule-firm);
  padding: 20px 0 0;
  margin-top: 0;
}

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(248px, 1fr)); gap: 26px 34px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(206px, 1fr)); gap: 24px 30px; }

.grid-2 > p, .grid-3 > p { margin-top: 5px; }

.kv {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
.kv th, .kv td { text-align: left; padding: 9px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.kv th {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-faint);
  width: 40%;
  padding-right: 20px;
}
.kv td { color: var(--ink-soft); }
.kv td:first-of-type { color: var(--ink); font-weight: 500; }

/* Real status values, so a real status colour is earned. */
.state { font-family: var(--mono); font-size: 13px; }
.state--on { color: var(--signal); }
.state--off { color: var(--alert); }
.state--idle { color: var(--ink-faint); }

.callout {
  border-left: 3px solid var(--alert);
  background: var(--alert-wash);
  padding: 16px 20px;
  margin: 30px 0 0;
}
.callout p { color: #6d2617; }
.callout--calm { border-left-color: var(--signal); background: var(--signal-wash); }
.callout--calm p { color: #12307f; }

.callout__head {
  font-weight: 650;
  color: #6d2617;
  display: block;
  margin-bottom: 3px;
}
.callout--calm .callout__head { color: #12307f; }

/* ------------------------------------------------------------------ steps */

/* Genuinely a sequence, so it is numbered. */
.steps { list-style: none; counter-reset: step; padding: 0; }
.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 46px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 0;
}
.steps > li:last-child { border-bottom: 0; }
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  border: 1.5px solid var(--ink);
}
.steps > li::after {
  content: "";
  position: absolute;
  left: 13px;
  top: 30px;
  bottom: 4px;
  width: 1px;
  background: var(--rule);
}
.steps > li:last-child::after { display: none; }

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

.colophon {
  border-top: 1px solid var(--rule-firm);
  margin-top: 0;
}
.colophon__inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 26px var(--gutter) 46px;
  display: flex;
  gap: 20px 32px;
  align-items: baseline;
  flex-wrap: wrap;
  color: var(--ink-faint);
  font-size: 14.5px;
}
.colophon__nav { margin-left: auto; display: flex; gap: 18px; flex-wrap: wrap; }
.colophon__nav a { color: var(--ink-soft); }

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

@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; }
  .rail {
    position: static;
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
    padding: 22px 0 18px;
    margin-bottom: 8px;
  }
  .rail dl { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
  .content { padding-top: 30px; max-width: none; }
  h1 { max-width: none; }
  h2 { max-width: none; }
}

@media (max-width: 620px) {
  :root { --gutter: 18px; }
  body { font-size: 16px; }
  .masthead__inner { flex-direction: column; align-items: flex-start; gap: 10px; padding: 14px var(--gutter); }
  .masthead__nav { margin-left: 0; }
  .lifecycle__track { grid-template-columns: 1fr 1fr; }
  .stage:nth-child(2) { border-right: 0; }
  .stage:nth-child(-n + 2) { border-bottom: 1px solid var(--rule); }
  .colophon__nav { margin-left: 0; }
}