/* STK site — carbon chassis, phosphor beam, vellum ink.
   Design language shared with fullbuild.ai/prototype/burn-in. */

:root {
  --carbon: #0B0C0E;
  --vellum: #EDE6D6;
  --phosphor: #FFB454;
  --arm: #FF3B2F;
  --graticule: #242B31;
  --well: #060708;
  --plate: #101215;
  --hairline: 1px solid var(--graticule);
}

* { box-sizing: border-box; }

html { background: var(--carbon); scroll-behavior: smooth; }

/* everything is sized in rem/em/ch, so scaling the root is equivalent to
   browser zoom (~130%) */
html { font-size: 130%; }

body {
  margin: 0;
  background: var(--carbon);
  color: var(--vellum);
  font-family: "Martian Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-weight: 400;
  font-size: 0.9375rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--vellum); }
a:hover { color: var(--phosphor); }
code {
  font-family: inherit;
  font-size: 0.92em;
  overflow-wrap: anywhere;
  color: var(--phosphor);
  background: rgba(255, 180, 84, 0.07);
  padding: 0.05em 0.3em;
  border-radius: 3px;
}
b { font-weight: 700; }

::selection { background: var(--phosphor); color: var(--carbon); }
:focus-visible { outline: 2px solid var(--phosphor); outline-offset: 3px; border-radius: 2px; }

h1, h2, h3 { margin: 0; font-weight: 800; letter-spacing: 0.06em; }
h1 {
  font-size: clamp(1.3rem, 3.6vw, 2.2rem);
  line-height: 1.3;
  text-wrap: balance;
}
h2 {
  font-size: clamp(1.15rem, 3vw, 1.8rem);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  line-height: 1.25;
  text-wrap: balance;
}

.visually-hidden {
  position: absolute;
  clip-path: inset(50%);
  width: 1px; height: 1px;
  overflow: hidden;
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  top: -3rem; left: 1rem;
  padding: 0.5rem 0.9rem;
  background: var(--carbon);
  border: 1px solid var(--phosphor);
  color: var(--phosphor);
  text-decoration: none;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  z-index: 20;
}
.skip-link:focus { top: 1rem; }

.section-label {
  margin: 0 0 0.6rem;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.32em;
  color: var(--phosphor);
}

.section-body {
  margin: 0.7rem 0 0;
  max-width: 52ch;
  opacity: 0.85;
}
.section-body.wide { max-width: 66ch; }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.7rem clamp(1rem, 4vw, 2.2rem);
  background: rgba(11, 12, 14, 0.88);
  backdrop-filter: blur(6px);
  border-bottom: var(--hairline);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
}

.wordmark {
  font-weight: 800;
  font-size: 1rem;
  text-decoration: none;
  color: var(--vellum);
}

.header-sub { opacity: 0.5; font-size: 0.62rem; letter-spacing: 0.2em; }

.site-header nav { display: none; gap: 1.1rem; margin-left: auto; }
.site-header nav a { text-decoration: none; opacity: 0.75; }
.site-header nav a:hover { opacity: 1; color: var(--phosphor); }

.header-proto {
  margin-left: auto;
  text-decoration: none;
  color: var(--phosphor);
  border: 1px solid var(--graticule);
  border-radius: 3px;
  padding: 0.25rem 0.6rem;
  white-space: nowrap;
}
.header-proto:hover { border-color: var(--phosphor); }

@media (min-width: 900px) {
  .site-header nav { display: flex; }
  .header-proto { margin-left: 0; }
}

/* ---------- riveted plates ---------- */

[data-plate] {
  position: relative;
  background:
    radial-gradient(circle 3px at 12px 12px, #2c333a 0 2px, rgba(0,0,0,0.7) 2px 3px, transparent 3px),
    radial-gradient(circle 3px at calc(100% - 12px) 12px, #2c333a 0 2px, rgba(0,0,0,0.7) 2px 3px, transparent 3px),
    radial-gradient(circle 3px at 12px calc(100% - 12px), #2c333a 0 2px, rgba(0,0,0,0.7) 2px 3px, transparent 3px),
    radial-gradient(circle 3px at calc(100% - 12px) calc(100% - 12px), #2c333a 0 2px, rgba(0,0,0,0.7) 2px 3px, transparent 3px),
    linear-gradient(180deg, #14171b, var(--plate));
  border: var(--hairline);
  border-radius: 8px;
  box-shadow: 0 1px 0 rgba(237, 230, 214, 0.05) inset, 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* ---------- hero / live meter ---------- */

.power-on {
  min-height: calc(100svh - 48px);
  display: flex;
  flex-direction: column;
  padding: clamp(0.8rem, 2.5vw, 2rem) clamp(0.8rem, 4vw, 2.2rem) 1.2rem;
  gap: 0.8rem;
}

.hero-bezel {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  padding: clamp(0.8rem, 1.8vw, 1.3rem);
  border-radius: 12px;
}

.bezel-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.bezel-row .section-label { margin: 0; flex: 1; }

.meter-state {
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  color: var(--arm);
}
.meter-state.is-live { color: var(--phosphor); }

.led {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #ffb1aa, var(--arm) 60%, rgba(255, 59, 47, 0.2));
  box-shadow: 0 0 8px rgba(255, 59, 47, 0.7);
  animation: led-breathe 3.4s ease-in-out infinite;
  flex: none;
}
.led.is-live {
  background: radial-gradient(circle at 35% 35%, #ffe2b0, var(--phosphor) 60%, rgba(255, 180, 84, 0.2));
  box-shadow: 0 0 8px rgba(255, 180, 84, 0.7);
}
@keyframes led-breathe { 50% { opacity: 0.35; } }

.hero-scope {
  flex: 1;
  min-height: max(34svh, 260px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  padding: clamp(1rem, 3vw, 2rem);
  border-radius: 8px;
}

.scope {
  position: relative;
  overflow: hidden;
  border: var(--hairline);
  background-color: var(--well);
  background-image:
    linear-gradient(var(--graticule) 1px, transparent 1px),
    linear-gradient(90deg, var(--graticule) 1px, transparent 1px);
  background-size: 12.5% 25%;
  box-shadow:
    inset 0 0 0 1px rgba(0, 0, 0, 0.6),
    inset 0 6px 24px rgba(0, 0, 0, 0.75),
    inset 0 0 60px rgba(255, 180, 84, 0.03);
}

/* phosphor burn canvas: fills the scope, sits under the readout text */
.burn {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.85;
}

/* scanlines over the burn, under the text */
.hero-scope::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.22) 0,
    rgba(0, 0, 0, 0.22) 1px,
    transparent 1px,
    transparent 3px
  );
}

.hero-scope > .hero-tagline-wrap,
.hero-scope > .spark {
  position: relative;
  z-index: 2;
}

.hero-tagline-wrap {
  text-align: center;
  padding: 1.25rem 2rem;
  background: radial-gradient(closest-side, rgba(6, 7, 8, 0.88) 45%, rgba(6, 7, 8, 0) 100%);
}

.hero-number { margin: 0; }
.hero-number b {
  display: block;
  font-size: clamp(2.6rem, 11vw, 6.5rem);
  font-weight: 800;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  color: var(--phosphor);
  text-shadow: 0 0 18px rgba(255, 180, 84, 0.5), 0 0 3px rgba(255, 243, 220, 0.8);
}
.hero-unit {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.32em;
  color: rgba(237, 230, 214, 0.65);
}

.hero-sub {
  margin: 1rem auto 0;
  max-width: 46ch;
  font-size: 0.78rem;
  opacity: 0.6;
}

/* per-day sparkline bars, phosphor on glass, month/day tick under each */
.spark {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  width: min(60%, 420px);
}
.spark-col {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 4px;
}
.spark-bar {
  min-height: 2px;
  background: var(--phosphor);
  box-shadow: 0 0 6px rgba(255, 180, 84, 0.45);
  opacity: 0.85;
}
/* min-height reserves the tick row on unlabelled days so every bar shares a baseline */
.spark-day {
  min-height: 0.75rem;
  font-size: 0.55rem;
  line-height: 0.75rem;
  letter-spacing: 0.04em;
  text-align: center;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  color: rgba(237, 230, 214, 0.72);
  /* dark halo keeps the ticks readable where the burn glow is brightest */
  text-shadow: 0 0 4px rgba(6, 7, 8, 0.9), 0 0 2px rgba(6, 7, 8, 0.9);
}
.spark:empty { display: none; }

.hero-readouts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.well {
  margin: 0;
  background: var(--well);
  border: var(--hairline);
  border-radius: 4px;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.8), inset 0 -1px 0 rgba(237, 230, 214, 0.05);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: rgba(237, 230, 214, 0.6);
}
.well b {
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--phosphor);
  text-shadow: 0 0 6px rgba(255, 180, 84, 0.45);
  letter-spacing: 0.06em;
}
.well--field {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.65rem 0.85rem;
  flex: 1 1 8rem;
}
.well--field span { font-size: 0.62rem; letter-spacing: 0.28em; }
.well--field b { font-size: 0.9rem; }

/* hero source CTA: the one lit control on the chassis */
.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  border-top: var(--hairline);
  padding-top: 1rem;
}
.cta-button {
  display: inline-block;
  text-decoration: none;
  background: var(--phosphor);
  color: var(--carbon);
  font-weight: 800;
  font-size: clamp(0.8rem, 2.2vw, 0.95rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.7rem 1.4rem;
  border: 1px solid var(--phosphor);
  border-radius: 4px;
  box-shadow: 0 0 18px rgba(255, 180, 84, 0.35);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.cta-button:hover {
  color: var(--carbon);
  box-shadow: 0 0 28px rgba(255, 180, 84, 0.6);
  transform: translateY(-1px);
}
.cta-note {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  opacity: 0.75;
}
.cta-note a { color: var(--phosphor); }

.caveat-plate {
  border-top: var(--hairline);
  padding-top: 0.9rem;
}
.caveat {
  margin: 0;
  font-size: 0.74rem;
  line-height: 1.7;
  opacity: 0.75;
  max-width: 90ch;
}
.caveat b { color: var(--phosphor); letter-spacing: 0.06em; }

/* ---------- bands & channels ---------- */

.band {
  border-top: var(--hairline);
  border-bottom: var(--hairline);
  background: linear-gradient(180deg, #0d0f12, var(--carbon));
}
.band-inner {
  max-width: 62rem;
  margin: 0 auto;
  padding: clamp(2.5rem, 7vw, 5rem) clamp(1rem, 4vw, 2.2rem);
}

.channel {
  max-width: 62rem;
  margin: 0 auto;
  padding: clamp(2.5rem, 7vw, 4.5rem) clamp(1rem, 4vw, 2.2rem);
}
.channel + .channel { border-top: var(--hairline); }
.channel-head { margin-bottom: 1.8rem; }

/* ---------- CH1 stats ---------- */

.stat-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-bottom: 1.6rem;
}
.stat-plate { padding: 1.4rem 1.5rem; }
.stat-plate--hot { border-color: rgba(255, 180, 84, 0.45); }
.stat-big {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 4rem);
  font-weight: 800;
  line-height: 1;
  color: var(--phosphor);
  text-shadow: 0 0 14px rgba(255, 180, 84, 0.4);
  font-variant-numeric: tabular-nums;
}
.stat-unit { font-size: 0.5em; }
.stat-caption { margin: 0.8rem 0 0; font-size: 0.8rem; opacity: 0.8; max-width: 46ch; }

.bar-viz {
  padding: 1.1rem 1.2rem;
  border: var(--hairline);
  border-radius: 6px;
  background: var(--well);
}
.bar-row {
  display: grid;
  grid-template-columns: 4.5rem 1fr 4.5rem;
  align-items: center;
  gap: 0.8rem;
  padding: 0.3rem 0;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
}
.bar-label { opacity: 0.65; }
.bar-track { height: 12px; background: rgba(36, 43, 49, 0.5); border-radius: 2px; overflow: hidden; }
.bar-fill {
  display: block;
  height: 100%;
  width: var(--w);
  background: var(--phosphor);
  box-shadow: 0 0 8px rgba(255, 180, 84, 0.5);
}
.bar-fill--dim { background: rgba(237, 230, 214, 0.35); box-shadow: none; }
.bar-val { text-align: right; color: var(--phosphor); font-variant-numeric: tabular-nums; }
.bar-note { margin: 0.6rem 0 0; font-size: 0.66rem; letter-spacing: 0.1em; opacity: 0.5; }

/* ---------- CH2 matrix & terminal ---------- */

.matrix {
  list-style: none;
  counter-reset: rule;
  margin: 0 0 1.6rem;
  padding: 0;
  border: var(--hairline);
  border-radius: 6px;
  overflow: hidden;
}
.matrix li {
  counter-increment: rule;
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 0.7rem;
  align-items: baseline;
  padding: 0.7rem 1rem;
  font-size: 0.8rem;
  background: var(--plate);
}
.matrix li:nth-child(even) { background: #0d0f12; }
.matrix li + li { border-top: var(--hairline); }
.matrix li::before {
  content: counter(rule);
  font-size: 0.66rem;
  color: rgba(237, 230, 214, 0.4);
  letter-spacing: 0.1em;
}
.m-cond { min-width: 0; }
.m-arrow { opacity: 0.4; }
.m-act { font-weight: 700; letter-spacing: 0.18em; font-size: 0.72rem; }
.m-allow { color: rgba(237, 230, 214, 0.75); }
.m-deny { color: var(--phosphor); text-shadow: 0 0 8px rgba(255, 180, 84, 0.5); }
.m-why { grid-column: 2 / -1; font-size: 0.7rem; opacity: 0.55; }

@media (min-width: 760px) {
  .matrix li { grid-template-columns: auto minmax(0, 1.2fr) auto auto minmax(0, 1fr); }
  .m-why { grid-column: auto; text-align: right; }
}

.outline-demo { padding: 1.2rem 1.3rem; }
.demo-caption { margin: 0 0 0.7rem; font-size: 0.72rem; letter-spacing: 0.18em; color: var(--phosphor); }
.demo-note { margin: 0.8rem 0 0; font-size: 0.76rem; opacity: 0.7; }

.terminal {
  margin: 0;
  padding: 1rem 1.1rem;
  background: var(--well);
  border: var(--hairline);
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.74rem;
  line-height: 1.6;
  color: var(--phosphor);
  text-shadow: 0 0 4px rgba(255, 180, 84, 0.3);
  box-shadow: inset 0 2px 12px rgba(0, 0, 0, 0.7);
}
.terminal code { background: none; padding: 0; color: inherit; font-size: inherit; }

/* ---------- CH3 rtk ---------- */

.rtk-grid {
  display: grid;
  gap: 1.2rem;
}
@media (min-width: 860px) { .rtk-grid { grid-template-columns: 1.2fr 1fr; align-items: start; } }

.table-scroll { overflow-x: auto; }

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  border: var(--hairline);
}
.spec-table th, .spec-table td {
  text-align: left;
  padding: 0.6rem 0.9rem;
  border: var(--hairline);
  vertical-align: top;
}
.spec-table thead th {
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  color: var(--phosphor);
  background: var(--plate);
}
.spec-table tbody th {
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: rgba(237, 230, 214, 0.55);
  font-weight: 500;
  white-space: nowrap;
}

.rtk-meter { padding: 1.2rem 1.3rem; display: flex; flex-direction: column; gap: 0.9rem; }
.rtk-meter .caveat { font-size: 0.7rem; }

/* ---------- methodology ---------- */

.meth-list {
  margin: 0;
  padding-left: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  max-width: 72ch;
  font-size: 0.85rem;
}
.meth-list li::marker { color: var(--phosphor); }
.meth-list b { color: var(--phosphor); font-weight: 700; letter-spacing: 0.04em; }

/* ---------- install ---------- */

.install-plate { padding: 1.3rem 1.4rem; display: flex; flex-direction: column; gap: 0.9rem; }
.config-note { margin: 0; font-size: 0.72rem; opacity: 0.6; }

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

.site-footer {
  border-top: var(--hairline);
  padding: 1.6rem clamp(1rem, 4vw, 2.2rem) 2.2rem;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  opacity: 0.7;
}
.site-footer p { margin: 0.3rem 0; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .led { animation: none; }
}