/* ============================================================
   Switchyard — signal-box design system
   Palette: enamel green-black ground, timetable-cream type,
   three semantic signal aspects (never decorative).
   Type: Archivo (signage, wide caps) + IBM Plex Mono (the log).
   ============================================================ */

:root {
  --enamel: #0f1713;      /* page ground: deep signal-box enamel */
  --panel: #141f19;       /* raised panel */
  --panel-2: #1a2820;     /* panel hover / inset */
  --track: #2c3d33;       /* hairline rules and track lines */
  --track-lit: #57705f;   /* active track */
  --cream: #eae3d2;       /* timetable paper — primary type */
  --steel: #90a498;       /* muted labels */
  --lamp-red: #e25c4e;
  --lamp-amber: #e8b33c;
  --lamp-green: #45d183;

  --font-sign: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  --measure: 62ch;
  --gutter: clamp(1.25rem, 5vw, 4rem);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--enamel);
  color: var(--cream);
  font-family: var(--font-sign);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--panel-2);
  border: 1px solid var(--track);
  border-radius: 4px;
  padding: 0.08em 0.35em;
  white-space: nowrap;
}

a { color: var(--cream); text-decoration-color: var(--track-lit); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--lamp-green); }

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

::selection { background: var(--lamp-green); color: var(--enamel); }

/* ---------- top bar ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.1rem var(--gutter);
  /* double rule, like the twin rails of a track */
  border-bottom: 1px solid var(--track);
  box-shadow: 0 4px 0 -3px var(--track);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}

.brand-mark { width: 30px; height: 30px; color: var(--cream); }

.brand-name {
  font-weight: 800;
  font-stretch: 115%;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.95rem;
}

.version-chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--lamp-green);
  border: 1px solid var(--track);
  border-radius: 999px;
  padding: 0.1rem 0.55rem;
}

.topnav { display: flex; flex-wrap: wrap; gap: 1.4rem; }

.topnav a {
  font-size: 0.82rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--steel);
}

.topnav a:hover { color: var(--cream); }

.topnav a.ext::after { content: " ↗"; color: var(--track-lit); }

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

.hero {
  padding: clamp(3.5rem, 9vw, 6.5rem) var(--gutter) 1.5rem;
  max-width: 68rem;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--steel);
  margin: 0 0 1.4rem;
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 2.2rem;
  height: 1px;
  background: var(--track-lit);
  vertical-align: middle;
  margin-right: 0.8rem;
}

h1 {
  font-weight: 900;
  font-stretch: 122%;
  text-transform: uppercase;
  font-size: clamp(2.2rem, 5.8vw, 4.25rem);
  line-height: 0.98;
  letter-spacing: 0.01em;
  margin: 0 0 1.6rem;
}

.lede {
  max-width: var(--measure);
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  color: var(--cream);
  margin: 0 0 2.2rem;
}

.lede em { color: var(--lamp-green); font-style: normal; }

.install {
  display: inline-flex;
  align-items: stretch;
  max-width: 100%;
  border: 1px solid var(--track-lit);
  border-radius: 6px;
  background: var(--panel);
  overflow: hidden;
}

.install > code {
  background: none;
  border: none;
  padding: 0.85rem 1.1rem;
  font-size: 0.95rem;
  overflow-x: auto;
}

.copy-btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--enamel);
  background: var(--cream);
  border: none;
  padding: 0 1.1rem;
  cursor: pointer;
}

.copy-btn:hover { background: var(--lamp-green); }

.copy-btn.copied { background: var(--lamp-green); }

.install-note {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--steel);
  margin-top: 0.9rem;
}

.install-note code { border: none; background: none; padding: 0; color: var(--cream); }

/* ---------- signature: the yard diagram ---------- */

.yard { padding: 1.5rem var(--gutter) 3rem; }

.yard-frame {
  border: 1px solid var(--track);
  border-radius: 8px;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(69, 209, 131, 0.045), transparent 65%),
    var(--panel);
  padding: clamp(0.5rem, 2vw, 1.5rem);
  overflow-x: auto;
}

#yard-svg { display: block; width: 100%; min-width: 640px; height: auto; }

.track {
  fill: none;
  stroke: var(--track);
  stroke-width: 2.5;
  stroke-linecap: round;
}

.track-idle { stroke-dasharray: 1 6; opacity: 0.8; }

.track-agent { stroke: var(--track-lit); }

.rail-label {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  fill: var(--steel);
}

.wt-label rect { fill: var(--panel-2); stroke: var(--track); }

.wt-label text {
  font-family: var(--font-mono);
  font-size: 14px;
  fill: var(--cream);
}

.points { fill: var(--cream); }

.dot { opacity: 0; }
.dot-claude { fill: var(--lamp-green); }
.dot-codex { fill: var(--lamp-amber); }

.signal-post { fill: var(--track-lit); }

.signal-head { fill: var(--panel-2); stroke: var(--track-lit); stroke-width: 1.5; }

.lamp { fill: var(--track); transition: fill 0.35s ease, filter 0.35s ease; }

.lamp.lit-red   { fill: var(--lamp-red);   filter: drop-shadow(0 0 7px var(--lamp-red)); }
.lamp.lit-amber { fill: var(--lamp-amber); filter: drop-shadow(0 0 7px var(--lamp-amber)); }
.lamp.lit-green { fill: var(--lamp-green); filter: drop-shadow(0 0 7px var(--lamp-green)); }

.yard-caption {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--steel);
  margin: 0.9rem 0 0;
  min-height: 1.5em;
}

.caption-tag {
  display: inline-block;
  border: 1px solid var(--track-lit);
  border-radius: 3px;
  padding: 0.05rem 0.5rem;
  margin-right: 0.7rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cream);
}

.caption-tag.tag-red   { border-color: var(--lamp-red);   color: var(--lamp-red); }
.caption-tag.tag-amber { border-color: var(--lamp-amber); color: var(--lamp-amber); }
.caption-tag.tag-green { border-color: var(--lamp-green); color: var(--lamp-green); }

/* ---------- shared section chrome ---------- */

main > section { padding: clamp(2.5rem, 6vw, 4.5rem) var(--gutter); }

.section-head {
  font-weight: 800;
  font-stretch: 118%;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: clamp(1.25rem, 2.6vw, 1.7rem);
  margin: 0 0 1.2rem;
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

/* the rule runs off the header like a siding leaving a platform */
.section-head::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--track);
  min-width: 3rem;
}

.section-lede { max-width: var(--measure); color: var(--steel); margin: 0 0 2.2rem; }

.section-lede code { color: var(--cream); }

/* ---------- incident ---------- */

.incident-panel {
  max-width: 46rem;
  border-left: 3px solid var(--lamp-red);
  background: var(--panel);
  border-radius: 0 8px 8px 0;
  padding: 1.6rem 1.9rem;
}

.incident-panel p { margin: 0 0 1rem; }
.incident-panel p:last-child { margin-bottom: 0; }

/* ---------- timetable ---------- */

.halts {
  list-style: none;
  margin: 0 0 3rem;
  padding: 0;
  max-width: 52rem;
}

.halt {
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 1.4rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--track);
}

.halt:last-child { border-bottom: 1px solid var(--track); }

.halt-no {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  color: var(--track-lit);
  line-height: 1.1;
}

.halt-cmd {
  display: inline-block;
  font-size: 1.02rem;
  color: var(--lamp-green);
  background: none;
  border: none;
  padding: 0;
  margin-bottom: 0.45rem;
}

.halt-body p { margin: 0; color: var(--steel); max-width: var(--measure); }

.halt-body p code { color: var(--cream); }

/* ---------- console figures ---------- */

.console-fig { margin: 0; max-width: 52rem; }

.console-fig figcaption {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 0.6rem;
}

.console {
  margin: 0;
  background: #0b110d;
  border: 1px solid var(--track);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
}

.console code {
  background: none;
  border: none;
  padding: 0;
  white-space: pre;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--cream);
}

/* ---------- signal aspects ---------- */

.aspect-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1.2rem;
  max-width: 62rem;
}

.aspect {
  background: var(--panel);
  border: 1px solid var(--track);
  border-radius: 8px;
  padding: 1.5rem 1.5rem 1.4rem;
}

.aspect-lamp {
  display: block;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  margin-bottom: 1rem;
}

.aspect-red .aspect-lamp   { background: var(--lamp-red);   box-shadow: 0 0 12px rgba(226, 92, 78, 0.55); }
.aspect-amber .aspect-lamp { background: var(--lamp-amber); box-shadow: 0 0 12px rgba(232, 179, 60, 0.55); }
.aspect-green .aspect-lamp { background: var(--lamp-green); box-shadow: 0 0 12px rgba(69, 209, 131, 0.55); }

.aspect h3 {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 0.6rem;
}

.aspect-red h3   { color: var(--lamp-red); }
.aspect-amber h3 { color: var(--lamp-amber); }
.aspect-green h3 { color: var(--lamp-green); }

.aspect p { margin: 0; font-size: 0.95rem; color: var(--steel); }

/* ---------- roster ---------- */

.roster-table-wrap { overflow-x: auto; max-width: 62rem; }

.roster-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.roster-table td {
  padding: 0.65rem 1rem 0.65rem 0;
  border-top: 1px solid var(--track);
  vertical-align: top;
  color: var(--steel);
}

.roster-table td:first-child { white-space: nowrap; width: 1%; padding-right: 2rem; }

.roster-table td code { color: var(--cream); background: none; border: none; padding: 0; }

.roster-group th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lamp-green);
  padding: 1.8rem 0 0.5rem;
  border: none;
}

/* ---------- mcp ---------- */

.mcp-cols {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 2.5rem;
  max-width: 62rem;
}

.mcp-copy p { max-width: var(--measure); margin: 0 0 1rem; color: var(--steel); }

.mcp-copy p code { color: var(--cream); }

@media (max-width: 46rem) {
  .mcp-cols { grid-template-columns: 1fr; }
}

/* ---------- cta ---------- */

.cta {
  text-align: center;
  border-top: 1px solid var(--track);
}

.cta h2 {
  font-weight: 900;
  font-stretch: 122%;
  text-transform: uppercase;
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  margin: 0 0 1.8rem;
}

.cta .install { text-align: left; }

.cta .install-note a { color: var(--steel); }
.cta .install-note a:hover { color: var(--cream); }

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

.footer {
  border-top: 1px solid var(--track);
  box-shadow: 0 -4px 0 -3px var(--track);
  padding: 2rem var(--gutter) 2.5rem;
  font-size: 0.88rem;
  color: var(--steel);
}

.footer p { margin: 0 0 0.4rem; }

.footer-mark {
  font-weight: 800;
  font-stretch: 115%;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cream);
  font-size: 0.8rem;
}

.footer-links a { color: var(--steel); }
.footer-links a:hover { color: var(--cream); }

/* ---------- reveals & motion ---------- */

.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.6s ease, transform 0.6s ease; }

.reveal.on { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .lamp { transition: none; }
}

/* ---------- small screens ---------- */

@media (max-width: 40rem) {
  .halt { grid-template-columns: 2.6rem 1fr; gap: 0.9rem; }
  .halt-no { font-size: 1.15rem; padding-top: 0.2rem; }
  .topnav { gap: 0.9rem; }
  .install { display: flex; }
}