/* ============================================================================
   LAYOUT — rail, nav, section shell, grid, footer
   ========================================================================== */

.shell {
  position: relative;
  padding-left: var(--rail);
}

/* ----------------------------------------------------------------------------
   INSTRUMENT RAIL
   A fixed left edge carrying live readouts. This is the device the whole
   page is pretending to be — it stays put while content scrolls past it.
   -------------------------------------------------------------------------- */
.rail {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--rail);
  height: 100vh;
  z-index: 60;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: var(--s-5) 0;
  border-right: var(--hair) solid var(--rule);
  background: color-mix(in srgb, var(--void) 82%, transparent);
  backdrop-filter: blur(14px);
}

@media (min-width: 900px) { .rail { display: flex; } }

.rail__mark {
  width: 22px;
  height: 22px;
  border: var(--hair) solid var(--sodium);
  border-radius: 50%;
  position: relative;
  flex: none;
}
.rail__mark::after {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  background: var(--sodium);
  animation: pulse 2.6s var(--e-io) infinite;
}

.rail__code {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: var(--t-label);
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--ink-dim);
  font-variant-numeric: tabular-nums;
}
.rail__code b { color: var(--sodium); font-weight: 500; }

.rail__ticks {
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: var(--s-5) 0;
}
.rail__tick {
  width: 20px;
  height: var(--hair);
  background: var(--ink-faint);
  transform: scaleX(0.4);
  transition: transform var(--d-std) var(--e-out),
              background var(--d-std) var(--e-out);
}
.rail__tick.is-on { transform: scaleX(1); background: var(--sodium); }

.rail__meter {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: var(--t-tick);
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

/* ----------------------------------------------------------------------------
   NAV
   -------------------------------------------------------------------------- */
.nav {
  position: fixed;
  /* the scroll-progress hairline is absolutely positioned against this */
  top: 0;
  left: var(--rail);
  right: 0;
  z-index: 70;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  padding: var(--s-4) var(--gutter);
  border-bottom: var(--hair) solid transparent;
  background: transparent;
  transition: background var(--d-std) var(--e-out),
              border-color var(--d-std) var(--e-out);
}
.nav.is-stuck {
  background: color-mix(in srgb, var(--void) 74%, transparent);
  backdrop-filter: blur(24px) saturate(180%);
  border-bottom-color: var(--rule);
  padding-top: var(--s-3);
  padding-bottom: var(--s-3);
}

.nav__id {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 118%;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  font-size: 0.95rem;
  display: flex;
  align-items: baseline;
  gap: var(--s-2);
}
.nav__id span { color: var(--sodium); }
.nav__id { white-space: nowrap; }
@media (max-width: 479px) {
  .nav { gap: var(--s-2); }
  .nav__id { font-size: 0.8rem; }
  .nav__tools { gap: var(--s-2); }
  .nav .btn:not(.btn--icon) { padding-inline: var(--s-3); }
  .nav [data-print] { display: none; }
}

.nav__links {
  display: none;
  align-items: center;
  gap: var(--s-5);
  min-width: 0;      /* a flex item will not shrink below content without this */
  flex: 0 1 auto;
  overflow: hidden;  /* last-resort clip, so overflow never reaches the tools */
}
/* 1180, not 1040: four tool buttons plus nine links need the extra room.
   Below this the links live in the rail and the section index instead. */
@media (min-width: 1180px) { .nav__links { display: flex; } }

.nav__link {
  font-family: var(--font-mono);
  font-size: var(--t-label);
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--ink-dim);
  position: relative;
  padding-bottom: 3px;
  transition: color var(--d-micro) var(--e-out);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: var(--hair);
  background: var(--sodium);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--d-std) var(--e-out);
}
.nav__link:hover,
.nav__link.is-active { color: var(--ink); }
.nav__link:hover::after,
.nav__link.is-active::after { transform: scaleX(1); transform-origin: left; }
.nav__link i {
  font-style: normal;
  color: var(--ink-dim);
  margin-right: 6px;
}

/* The tools never compress: they are the controls, and a half-clipped Star
   button is worse than a shorter link row. Anything that does not fit comes
   out of .nav__links, which can shrink and is duplicated in the rail. */
.nav__tools { display: flex; align-items: center; gap: var(--s-3); flex: none; }

/* --- mobile subnav: horizontal scroll strip, hidden once the full links fit */
.subnav {
  position: fixed;
  top: 58px;
  left: var(--rail);
  right: 0;
  z-index: 65;
  display: flex;
  gap: var(--s-4);
  padding: var(--s-2) var(--gutter) var(--s-3);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  background: color-mix(in srgb, var(--void) 82%, transparent);
  backdrop-filter: blur(18px);
  border-bottom: var(--hair) solid var(--rule);
}
.subnav::-webkit-scrollbar { display: none; }
.subnav a {
  font-family: var(--font-mono);
  font-size: var(--t-label);
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--ink-dim);
  white-space: nowrap;
  padding: 2px 0;
}
.subnav a.is-active { color: var(--sodium); }
@media (min-width: 1040px) { .subnav { display: none; } }

/* ----------------------------------------------------------------------------
   SECTION SHELL
   Every section opens with a datasheet header: code / name / one-line spec.
   -------------------------------------------------------------------------- */
.section {
  position: relative;
  padding: var(--section-y) var(--gutter);
  border-top: var(--hair) solid var(--rule-soft);
}
.section--flush { padding-top: 0; border-top: none; }
.section--tight { padding-block: clamp(64px, 8vw, 120px); }

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

.sec-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
  padding-bottom: var(--s-6);
  margin-bottom: var(--s-6);
  border-bottom: var(--hair) solid var(--rule);
}
@media (min-width: 860px) {
  .sec-head {
    grid-template-columns: 120px minmax(0, 1fr) minmax(0, 26ch);
    gap: var(--s-6);
    align-items: end;
  }
}

.sec-head__code {
  font-family: var(--font-mono);
  font-size: var(--t-label);
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--sodium);
  font-variant-numeric: tabular-nums;
  display: flex;
  align-items: center;
  gap: var(--s-2);
}
.sec-head__code::before {
  content: "";
  width: 18px;
  height: var(--hair);
  background: var(--sodium);
  flex: none;
}

.sec-head__spec {
  font-family: var(--font-mono);
  font-size: var(--t-small);
  line-height: 1.55;
  color: var(--ink-dim);
}

/* --- 12 column grid ------------------------------------------------------ */
/* One column below 860px — every child full width. The 12-column raster
   exists only where the col-* spans are also live, so nothing can ever be
   auto-placed into a single 1/12 sliver on a phone. */
.grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s-6) var(--s-5);
}
.grid > * { min-width: 0; }
.col-full { grid-column: 1 / -1; }
@media (min-width: 860px) {
  .grid { grid-template-columns: repeat(12, minmax(0, 1fr)); }
  .col-7 { grid-column: span 7; }
  .col-5 { grid-column: span 5; }
  .col-6 { grid-column: span 6; }
  .col-4 { grid-column: span 4; }
  .col-8 { grid-column: span 8; }
  .col-4--right { grid-column: 9 / -1; }
}

/* --- stack helper -------------------------------------------------------- */
.stack   { display: flex; flex-direction: column; gap: var(--s-4); }
.stack-6 { display: flex; flex-direction: column; gap: var(--s-6); }
.stack-7 { display: flex; flex-direction: column; gap: var(--s-7); }
.row     { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3); }

/* ----------------------------------------------------------------------------
   HERO
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: calc(var(--s-10) + var(--s-8)) var(--gutter) var(--s-7);
  overflow: hidden;
  isolation: isolate;
}

.hero > .wrap { min-width: 0; max-width: 100%; }

.hero__gl {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
}

/* fallback painted underneath the canvas — also the no-WebGL state */
.hero__fallback {
  position: absolute;
  inset: 0;
  z-index: -3;
  background:
    radial-gradient(90% 70% at 78% 18%, var(--sodium-glow), transparent 62%),
    radial-gradient(70% 60% at 12% 82%, var(--trace-soft), transparent 60%),
    var(--void);
}

.hero__veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
    to top,
    var(--void) 2%,
    color-mix(in srgb, var(--void) 62%, transparent) 34%,
    transparent 72%
  );
  pointer-events: none;
}

.hero__top {
  position: absolute;
  top: clamp(104px, 13vh, 148px);
  left: var(--gutter);
  right: var(--gutter);
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
}

@media (max-width: 899px) {
  .hero { justify-content: space-between; }
  .hero__top { position: static; margin-bottom: var(--s-7); }
}

.hero__name {
  font-size: var(--t-mega);
  margin-bottom: var(--s-5);
}
.hero__name .ln { display: block; }

.hero__meta {
  display: grid;
  gap: var(--s-6);
  grid-template-columns: 1fr;
  padding-top: var(--s-6);
  border-top: var(--hair) solid var(--rule);
}
@media (min-width: 900px) {
  .hero__meta { grid-template-columns: minmax(0, 1fr) minmax(0, 30rem); align-items: start; }
}

/* ----------------------------------------------------------------------------
   FOOTER
   -------------------------------------------------------------------------- */
.foot {
  border-top: var(--hair) solid var(--rule);
  padding: var(--s-7) var(--gutter) var(--s-6)
           calc(var(--gutter) + var(--rail));
}
.foot__grid {
  display: grid;
  gap: var(--s-6);
  grid-template-columns: 1fr;
}
@media (min-width: 900px) {
  .foot__grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.foot__bar {
  margin-top: var(--s-7);
  padding-top: var(--s-4);
  border-top: var(--hair) solid var(--rule-soft);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--s-3);
}