/* KResLab · DESIGN.md remix: NVIDIA cinematic compute 60% × Ollama terminal 40%
   Layout: full-bleed cinematic hero over a live agent mesh, then a 1240px lab-bench grid.
   Hard 4px edges, border-only depth, one chromatic accent (Cherenkov blue, the glow of a reactor pool).
   Single dark world by design. */

:root {
  color-scheme: dark;

  /* surfaces, cool-biased toward the accent */
  --bg: #050607;
  --bg-alt: #0a0c10;
  --surface: #0f1217;
  --surface-2: #171b22;
  --line: #222832;
  --line-strong: #343c48;

  /* ink */
  --text: #eef1f5;
  --muted: #9ba4b3;
  --dim: #646d7c;

  /* the one accent */
  --cherenkov: #4d7cff;
  --cherenkov-hi: #7397ff;
  --cherenkov-soft: rgba(77, 124, 255, 0.14);
  --cherenkov-glow: rgba(77, 124, 255, 0.42);
  --on-accent: #04060b;

  /* semantic only: the human approval gate */
  --hazard: #ffb020;
  --hazard-soft: rgba(255, 176, 32, 0.12);

  /* type */
  --f-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --f-body: "Instrument Sans", "Helvetica Neue", Arial, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* scale: 12 / 14 / 16 / 18 / 22 / 28 / 40 / 56 / 88 / 120 */
  --fs-12: 0.75rem;
  --fs-14: 0.875rem;
  --fs-16: 1rem;
  --fs-18: 1.125rem;
  --fs-22: 1.375rem;
  --fs-28: 1.75rem;
  --fs-40: clamp(1.9rem, 3.6vw, 2.5rem);
  --fs-56: clamp(2.2rem, 4.8vw, 3.5rem);
  --fs-hero: clamp(2.7rem, 8.4vw, 7.5rem);

  --radius: 4px;
  --ease: cubic-bezier(0.2, 0.7, 0.1, 1);
  --nav-h: 64px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--f-body);
  font-size: var(--fs-16);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { margin: 0; text-wrap: balance; }
p { margin: 0; }
ol, ul { margin: 0; padding: 0; list-style: none; }
dl, dd { margin: 0; }

::selection { background: var(--cherenkov); color: var(--on-accent); }

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

.wrap { width: 100%; max-width: 1240px; margin-inline: auto; padding-inline: clamp(16px, 4vw, 40px); }

.eyebrow {
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cherenkov-hi);
  margin-bottom: 18px;
}

h2 {
  font-family: var(--f-display);
  font-weight: 750;
  font-stretch: 108%;
  font-size: var(--fs-56);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.lede { color: var(--muted); font-size: var(--fs-18); max-width: 60ch; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-body);
  font-weight: 600;
  font-size: var(--fs-16);
  text-decoration: none;
  padding: 13px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 160ms var(--ease), border-color 160ms var(--ease), color 160ms var(--ease);
  white-space: nowrap;
}
.btn-sm { padding: 8px 14px; font-size: var(--fs-14); }
.btn-primary { background: var(--cherenkov); color: var(--on-accent); }
.btn-primary:hover { background: var(--cherenkov-hi); }
.btn-primary::after { content: "→"; font-family: var(--f-mono); transition: transform 160ms var(--ease); }
.btn-primary:hover::after { transform: translateX(3px); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--cherenkov); }

/* ---------- nav ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  padding-top: env(safe-area-inset-top, 0px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { height: var(--nav-h); display: flex; align-items: center; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; flex: none; }
.brand img { width: 22px; height: auto; }
.brand-word {
  font-family: var(--f-display);
  font-weight: 700;
  font-stretch: 125%;
  font-size: var(--fs-14);
  letter-spacing: 0.22em;
}
.nav-links { display: flex; gap: 26px; margin-inline-start: auto; }
.nav-links a {
  font-size: var(--fs-14);
  color: var(--muted);
  text-decoration: none;
  padding-block: 6px;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.nav-links a:hover { color: var(--text); border-bottom-color: var(--cherenkov); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-toggle {
  display: none;
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 8px 12px;
  cursor: pointer;
}

@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }
  .nav-actions { margin-inline-start: auto; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 8px clamp(16px, 4vw, 40px) 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding-block: 14px; border-bottom: 1px solid var(--line); font-size: var(--fs-16); }
}
@media (max-width: 480px) {
  .nav-actions .btn-primary { display: none; }
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: min(920px, 94svh);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: calc(var(--nav-h) + env(safe-area-inset-top, 0px) + 72px);
  border-bottom: 1px solid var(--line);
}
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -2; }
.hero-scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(90deg, var(--bg) 0%, color-mix(in srgb, var(--bg) 72%, transparent) 38%, transparent 66%),
    linear-gradient(0deg, var(--bg) 0%, transparent 28%);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 48px;
  align-items: end;
  padding-bottom: 56px;
}
.hero-copy { min-width: 0; }

.hero-title {
  font-family: var(--f-display);
  font-weight: 850;
  font-stretch: 118%;
  font-size: var(--fs-hero);
  line-height: 0.9;
  letter-spacing: -0.035em;
  text-transform: uppercase;
  margin-bottom: 30px;
}
.hero-title .line { display: block; overflow: hidden; padding-bottom: 0.04em; }
.hero-title .line > span { display: inline-block; animation: rise 1.1s var(--ease) both; }
.hero-title .line:nth-child(2) > span { animation-delay: 90ms; }
.hero-title .line:nth-child(3) > span { animation-delay: 180ms; }
.hero-title em {
  font-style: normal;
  color: var(--cherenkov);
  text-shadow: 0 0 42px var(--cherenkov-glow);
}
@keyframes rise { from { transform: translateY(105%); } to { transform: translateY(0); } }

.hero-sub { font-size: var(--fs-18); color: var(--muted); max-width: 54ch; margin-bottom: 32px; }
.hero-sub::first-line { color: var(--text); }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 12px; }

.telemetry {
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  background: color-mix(in srgb, var(--bg-alt) 82%, transparent);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.telemetry-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  letter-spacing: 0.06em;
}
.telemetry-tag { color: var(--dim); text-align: right; }
.telemetry-rows > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}
.telemetry-rows dt { color: var(--muted); }
.telemetry-rows dd {
  font-size: var(--fs-16);
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.telemetry-rows .is-gate dd { color: var(--hazard); }
.telemetry-foot { padding: 10px 14px; color: var(--dim); }

.hero-strip {
  border-top: 1px solid var(--line);
  overflow: hidden;
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.marquee { display: flex; width: max-content; padding-block: 18px; }
.marquee-track { display: flex; flex: none; }
.marquee-track span::after { content: "/"; margin-inline: 18px; color: var(--cherenkov); opacity: 0.7; }
.js-anim .marquee { animation: marquee 38s linear infinite; }
.hero-strip:hover .marquee { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }

@media (max-width: 900px) {
  .hero { min-height: 0; }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .hero-scrim {
    background:
      linear-gradient(180deg, transparent 0%, color-mix(in srgb, var(--bg) 60%, transparent) 30%, var(--bg) 70%);
  }
  .hero { padding-top: calc(var(--nav-h) + env(safe-area-inset-top, 0px) + 200px); }
}

/* ---------- sections ---------- */
.section { padding-block: clamp(80px, 11vw, 136px); border-bottom: 1px solid var(--line); }
.section-alt { background: var(--bg-alt); }
.section-head { margin-bottom: clamp(40px, 6vw, 72px); }
.section-head.split {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 32px 64px;
  align-items: end;
}
@media (max-width: 860px) { .section-head.split { grid-template-columns: minmax(0, 1fr); } }

/* ---------- thesis: autonomy levels ---------- */
.levels {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  column-gap: 20px;
  row-gap: 0;
}
.levels-range {
  grid-column: 4 / 7;
  grid-row: 1;
  position: relative;
  height: 34px;
  border: 1px solid var(--cherenkov);
  border-bottom: 0;
  border-radius: var(--radius) var(--radius) 0 0;
  margin-bottom: 18px;
}
.levels-range span {
  position: absolute;
  top: -10px;
  left: 16px;
  padding-inline: 8px;
  background: var(--bg);
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cherenkov-hi);
}
.lvl { grid-row: 2; position: relative; padding-top: 22px; min-width: 0; }
.lvl::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: -20px;
  height: 2px;
  background: var(--line-strong);
}
.lvl:last-child::before { right: 0; }
.lvl::after {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 10px;
  height: 10px;
  background: var(--bg);
  border: 2px solid var(--line-strong);
  border-radius: 50%;
}
.lvl.in-range::before { background: var(--cherenkov); }
.lvl.in-range::after { border-color: var(--cherenkov); background: var(--cherenkov); box-shadow: 0 0 14px var(--cherenkov-glow); }
.lvl-id {
  display: block;
  font-family: var(--f-mono);
  font-size: var(--fs-28);
  color: var(--dim);
  margin-bottom: 10px;
  font-variant-numeric: tabular-nums;
}
.lvl.in-range .lvl-id { color: var(--text); }
.lvl h3 { font-family: var(--f-display); font-weight: 700; font-stretch: 110%; font-size: var(--fs-18); margin-bottom: 8px; }
.lvl p { color: var(--muted); font-size: var(--fs-14); }
.lvl:not(.in-range) h3 { color: var(--muted); }

@media (max-width: 900px) {
  .levels { grid-template-columns: minmax(0, 1fr); }
  .levels-range { display: none; }
  .lvl { grid-row: auto; padding: 0 0 28px 32px; }
  .lvl::before { top: 6px; bottom: 0; left: 4px; right: auto; width: 2px; height: auto; }
  .lvl:last-child::before { display: none; }
  .lvl::after { top: 2px; }
  .lvl:nth-child(5) h3::after {
    content: "KResLab range";
    margin-inline-start: 10px;
    font-family: var(--f-mono);
    font-size: var(--fs-12);
    font-weight: 400;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--cherenkov-hi);
  }
  .lvl-id { font-size: var(--fs-22); margin-bottom: 4px; }
}

/* ---------- architecture ---------- */
.arch {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(40px, 6vw, 88px);
  align-items: start;
}
.arch-copy { display: grid; gap: 20px; }
.arch-copy h2 { margin-bottom: 8px; }
.arch-copy > p { color: var(--muted); max-width: 52ch; }

.spec { border-top: 1px solid var(--line); margin-top: 8px; }
.spec li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-block: 11px;
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-14);
}
.spec li span:first-child { color: var(--dim); font-family: var(--f-mono); font-size: var(--fs-12); letter-spacing: 0.04em; text-transform: uppercase; padding-top: 2px; }
.spec li span:last-child { text-align: right; }

.stack-wrap { display: grid; grid-template-columns: minmax(0, 1fr) 36px; gap: 14px; }
.stack { display: grid; gap: 10px; }
.tier {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  gap: 18px;
  align-items: start;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 200ms var(--ease);
}
.tier:hover { border-color: var(--line-strong); }
.tier-id { font-family: var(--f-mono); font-size: var(--fs-22); color: var(--dim); line-height: 1.2; }
.tier-body { min-width: 0; }
.tier h3 { font-family: var(--f-display); font-weight: 700; font-stretch: 108%; font-size: var(--fs-18); margin-bottom: 4px; }
.tier p { color: var(--muted); font-size: var(--fs-14); }
.tier-note {
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding-top: 4px;
  white-space: nowrap;
}
.tier-core {
  background: linear-gradient(180deg, var(--cherenkov-soft), transparent 140%), var(--surface-2);
  border-color: var(--cherenkov);
  box-shadow: 0 0 0 1px var(--cherenkov-soft), 0 0 60px -18px var(--cherenkov-glow);
  padding-block: 26px;
}
.tier-core .tier-id { color: var(--cherenkov-hi); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.chips span {
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  padding: 5px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg);
}
.gate {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 16px;
  padding: 9px 16px;
  border: 1px dashed var(--hazard);
  border-radius: var(--radius);
  background: var(--hazard-soft);
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--hazard);
}
.gate span:last-child { color: var(--muted); text-transform: none; letter-spacing: 0; }
.rail {
  writing-mode: vertical-rl;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: repeating-linear-gradient(180deg, var(--line) 0 1px, transparent 1px 12px);
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.rail { position: relative; overflow: hidden; }
.rail-pulse {
  position: absolute;
  left: 50%;
  top: -80px;
  width: 2px;
  height: 80px;
  margin-left: -1px;
  background: linear-gradient(180deg, transparent, var(--cherenkov-hi));
  box-shadow: 0 0 14px var(--cherenkov-glow);
  border-radius: 2px;
  opacity: 0;
}
.js-anim .rail-pulse { opacity: 1; animation: railpulse 2.6s cubic-bezier(.55, .1, .35, 1) infinite; }
.js-anim .rail { animation: railflow 1.4s linear infinite; }
@keyframes railpulse { to { transform: translateY(calc(100% + 900px)); } }
@keyframes railflow { to { background-position: 0 12px; } }

@media (max-width: 960px) {
  .arch { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 560px) {
  .tier { grid-template-columns: 40px minmax(0, 1fr); padding: 16px; gap: 12px; }
  .tier-note { display: none; }
  .tier-id { font-size: var(--fs-16); }
  .stack-wrap { grid-template-columns: minmax(0, 1fr) 28px; gap: 10px; }
}

/* ---------- periodic table ---------- */
.ptable {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}
.ptable-main { min-width: 0; }
.groups { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.groups button {
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 7px 11px;
  cursor: pointer;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.groups button:hover, .groups button[aria-pressed="true"] { color: var(--text); border-color: var(--cherenkov); }

.elements { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.el {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  aspect-ratio: 1 / 0.92;
  max-width: 100%;
  padding: 12px 14px;
  text-align: left;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  font: inherit;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease), opacity 180ms var(--ease);
}
.el:hover { border-color: var(--line-strong); background: var(--surface-2); }
.el[aria-pressed="true"] {
  border-color: var(--cherenkov);
  background: linear-gradient(160deg, var(--cherenkov-soft), transparent 70%), var(--surface-2);
  box-shadow: 0 0 40px -14px var(--cherenkov-glow);
}
.el.dimmed { opacity: 0.28; }
.el-num { font-family: var(--f-mono); font-size: var(--fs-12); color: var(--dim); font-variant-numeric: tabular-nums; }
.el-sym {
  font-family: var(--f-display);
  font-weight: 800;
  font-stretch: 115%;
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
}
.el[aria-pressed="true"] .el-sym { color: var(--cherenkov-hi); }
.el-name { font-size: var(--fs-12); color: var(--muted); line-height: 1.3; }

.element-detail {
  position: sticky;
  top: calc(var(--nav-h) + 24px);
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  min-width: 0;
}
.ed-top { display: flex; justify-content: space-between; font-family: var(--f-mono); font-size: var(--fs-12); color: var(--dim); letter-spacing: 0.06em; text-transform: uppercase; }
.ed-sym {
  font-family: var(--f-display);
  font-weight: 850;
  font-stretch: 120%;
  font-size: clamp(4rem, 8vw, 6.5rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cherenkov);
  text-shadow: 0 0 48px var(--cherenkov-glow);
  margin-block: 18px 6px;
}
.ed-name { font-family: var(--f-display); font-weight: 700; font-stretch: 108%; font-size: var(--fs-28); margin-bottom: 14px; }
.ed-desc { color: var(--muted); margin-bottom: 22px; }
.ed-meta { border-top: 1px solid var(--line); }
.ed-meta > div { display: flex; justify-content: space-between; gap: 16px; padding-block: 10px; border-bottom: 1px solid var(--line); font-size: var(--fs-14); }
.ed-meta dt { font-family: var(--f-mono); font-size: var(--fs-12); text-transform: uppercase; letter-spacing: 0.04em; color: var(--dim); padding-top: 2px; }
.ed-meta dd { text-align: right; }

@media (max-width: 960px) {
  .ptable { grid-template-columns: minmax(0, 1fr); }
  .element-detail { position: static; }
}
@media (max-width: 520px) {
  .elements { gap: 6px; }
  .el { padding: 7px 8px; aspect-ratio: 1 / 1; }
  .el-name { display: none; }
}

/* ---------- instruments ---------- */
.instrument {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  padding-block: clamp(40px, 5vw, 64px);
  border-top: 1px solid var(--line);
}
.instrument.flip .inst-copy { order: 2; }
.inst-copy { display: grid; gap: 16px; min-width: 0; }
.inst-copy > p:not(.inst-tag) { color: var(--muted); }
.inst-name {
  font-family: var(--f-display);
  font-weight: 850;
  font-stretch: 125%;
  font-size: var(--fs-40);
  text-transform: uppercase;
  letter-spacing: -0.01em;
  line-height: 1;
}
.inst-tag { font-family: var(--f-mono); font-size: var(--fs-14); color: var(--cherenkov-hi); }

.code {
  margin: 0;
  min-width: 0;
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}
.code figcaption {
  display: flex;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  color: var(--dim);
  background: var(--surface);
}
.code pre {
  margin: 0;
  padding: 20px;
  overflow-x: auto;
  font-family: var(--f-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--text);
  tab-size: 2;
}
.code .k { color: var(--muted); }
.code .c { color: var(--dim); }
.code .a { color: var(--cherenkov-hi); }
.code .n { color: var(--text); font-weight: 500; }
.code .p { color: var(--cherenkov); }
.code .h { color: var(--hazard); }

@media (max-width: 900px) {
  .instrument { grid-template-columns: minmax(0, 1fr); }
  .instrument.flip .inst-copy { order: 0; }
}

/* ---------- protocol ---------- */
.protocol { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--line-strong); }
.protocol li { padding: 24px 24px 8px 0; position: relative; min-width: 0; }
.protocol li + li { padding-left: 24px; border-left: 1px solid var(--line); }
.pr-top { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 40px; font-family: var(--f-mono); }
.pr-num { font-size: var(--fs-40); color: var(--text); line-height: 1; font-variant-numeric: tabular-nums; }
.pr-time { font-size: var(--fs-12); color: var(--cherenkov-hi); text-transform: uppercase; letter-spacing: 0.06em; }
.protocol h3 { font-family: var(--f-display); font-weight: 750; font-stretch: 112%; font-size: var(--fs-22); margin-bottom: 10px; }
.protocol p { color: var(--muted); font-size: var(--fs-14); }
@media (max-width: 900px) {
  .protocol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .protocol li:nth-child(3) { padding-left: 0; border-left: 0; }
  .protocol li:nth-child(n+3) { border-top: 1px solid var(--line); }
}
@media (max-width: 560px) {
  .protocol { grid-template-columns: minmax(0, 1fr); }
  .protocol li, .protocol li + li { padding: 24px 0 16px; border-left: 0; }
  .protocol li + li { border-top: 1px solid var(--line); }
  .pr-top { margin-bottom: 18px; }
}

/* ---------- experiment log ---------- */
.log { border-top: 1px solid var(--line-strong); }
.log-row {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr) 140px 300px;
  gap: 32px;
  align-items: start;
  padding-block: 26px;
  border-bottom: 1px solid var(--line);
}
.log-row:not(.log-head):hover { background: linear-gradient(90deg, transparent, var(--cherenkov-soft) 50%, transparent); }
.log-head { padding-block: 12px; font-family: var(--f-mono); font-size: var(--fs-12); letter-spacing: 0.06em; text-transform: uppercase; color: var(--dim); }
.log-id { font-family: var(--f-mono); font-size: var(--fs-16); display: grid; gap: 4px; }
.log-id small { font-family: var(--f-body); font-size: var(--fs-14); color: var(--muted); }
.log-row > p { color: var(--muted); font-size: var(--fs-14); max-width: 52ch; }
.log-el { display: flex; flex-wrap: wrap; gap: 6px; }
.log-el b {
  font-family: var(--f-display);
  font-weight: 800;
  font-stretch: 115%;
  font-size: var(--fs-14);
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
}
.log-res { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 6px 14px; align-items: baseline; }
.log-res strong {
  font-family: var(--f-display);
  font-weight: 800;
  font-stretch: 110%;
  font-size: var(--fs-28);
  line-height: 1.1;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.log-res strong:first-child { color: var(--cherenkov-hi); }
.log-res small { font-size: var(--fs-14); color: var(--muted); }
@media (max-width: 1080px) {
  .log-row { grid-template-columns: 170px minmax(0, 1fr) 260px; }
  .log-row > :nth-child(3) { display: none; }
}
@media (max-width: 760px) {
  .log-head { display: none; }
  .log-row { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .log-row > :nth-child(3) { display: flex; }
}

/* ---------- rules ---------- */
.rules {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(32px, 6vw, 88px);
  align-items: start;
}
.rules > div:first-child { position: sticky; top: calc(var(--nav-h) + 32px); }
.rule-list { counter-reset: rule; border-top: 1px solid var(--line-strong); }
.rule-list li {
  counter-increment: rule;
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  column-gap: 16px;
  padding-block: 26px;
  border-bottom: 1px solid var(--line);
}
.rule-list li::before {
  content: "R" counter(rule);
  grid-row: span 2;
  font-family: var(--f-mono);
  font-size: var(--fs-14);
  color: var(--cherenkov-hi);
  padding-top: 8px;
}
.rule-list h3 { font-family: var(--f-display); font-weight: 750; font-stretch: 110%; font-size: var(--fs-28); line-height: 1.15; margin-bottom: 8px; }
.rule-list p { color: var(--muted); max-width: 56ch; }
@media (max-width: 860px) {
  .rules { grid-template-columns: minmax(0, 1fr); }
  .rules > div:first-child { position: static; }
  .rule-list li { grid-template-columns: 44px minmax(0, 1fr); }
  .rule-list h3 { font-size: var(--fs-22); }
}

/* ---------- contact ---------- */
.contact {
  position: relative;
  overflow: hidden;
  padding-block: clamp(96px, 13vw, 168px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(ellipse 60% 70% at 85% 110%, var(--cherenkov-soft), transparent 70%),
    var(--bg);
}
.contact-inner { display: grid; gap: 24px; }
.contact h2 { font-size: clamp(2.4rem, 6.4vw, 5.5rem); font-stretch: 115%; font-weight: 850; max-width: 16ch; letter-spacing: -0.03em; }
.contact-sub { color: var(--muted); font-size: var(--fs-18); max-width: 56ch; }
.contact-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; margin-top: 12px; }
.contact-email {
  font-family: var(--f-mono);
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  padding: 8px 0;
  border-bottom: 1px solid var(--cherenkov);
  user-select: all;
  margin-inline-end: 8px;
}
.copy-status { font-family: var(--f-mono); font-size: var(--fs-12); color: var(--cherenkov-hi); min-height: 1.5em; }

/* ---------- footer ---------- */
.footer { padding-block: 64px 32px; background: var(--bg); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 48px; padding-bottom: 48px; }
.footer-brand { display: grid; gap: 18px; }
.footer-brand img { width: 96px; height: auto; }
.footer-brand p { color: var(--dim); font-size: var(--fs-14); }
.footer-cols { display: flex; flex-wrap: wrap; gap: 48px 72px; }
.footer-cols div { display: grid; gap: 10px; align-content: start; }
.footer-cols h4 { font-family: var(--f-mono); font-size: var(--fs-12); font-weight: 400; letter-spacing: 0.08em; text-transform: uppercase; color: var(--dim); margin-bottom: 4px; }
.footer-cols a { color: var(--muted); text-decoration: none; font-size: var(--fs-14); }
.footer-cols a:hover { color: var(--text); }
.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  color: var(--dim);
}

/* ---------- 404 ---------- */
.lost { min-height: 100svh; display: grid; place-items: center; padding-block: 96px; }
.lost-inner { display: grid; gap: 22px; justify-items: start; }
.lost-code { font-family: var(--f-display); font-weight: 900; font-stretch: 125%; font-size: clamp(5rem, 18vw, 12rem); line-height: 0.85; color: var(--cherenkov); text-shadow: 0 0 60px var(--cherenkov-glow); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* =====================================================================
   MOTION LAYER
   Enabled only when boot.js adds .js-anim (never under reduced motion).
   ===================================================================== */

/* film grain over everything */
body::after {
  content: "";
  position: fixed;
  inset: -50%;
  z-index: 100;
  pointer-events: none;
  opacity: 0.055;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}
.js-anim body::after { animation: grain 0.9s steps(4) infinite; }
@keyframes grain {
  0% { transform: translate(0, 0); }
  25% { transform: translate(-3%, 2%); }
  50% { transform: translate(2%, -3%); }
  75% { transform: translate(-1%, 3%); }
  100% { transform: translate(3%, -1%); }
}

/* scroll progress */
.progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 100%;
  background: linear-gradient(90deg, transparent, var(--cherenkov) 30%, var(--cherenkov-hi));
  box-shadow: 0 0 12px var(--cherenkov-glow);
  transform-origin: 0 50%;
  transform: scaleX(var(--p, 0));
}

/* hero title: light sweep across "teams." */
.hero-title em {
  background: linear-gradient(100deg, var(--cherenkov) 0%, var(--cherenkov) 40%, var(--text) 50%, var(--cherenkov) 60%, var(--cherenkov) 100%);
  background-size: 300% 100%;
  background-position: 100% 0;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: none;
  filter: drop-shadow(0 0 28px var(--cherenkov-glow));
}
.js-anim .hero-title em { animation: sweep 5s 1.2s var(--ease) infinite; }
@keyframes sweep { 0% { background-position: 100% 0; } 45%, 100% { background-position: 0 0; } }

.js-anim .hero-sub, .js-anim .hero-ctas, .js-anim .telemetry, .js-anim .hero .eyebrow {
  animation: fadeup 1s var(--ease) both;
}
.js-anim .hero .eyebrow { animation-delay: 0ms; }
.js-anim .hero-sub { animation-delay: 380ms; }
.js-anim .hero-ctas { animation-delay: 520ms; }
.js-anim .telemetry { animation-delay: 700ms; }
@keyframes fadeup { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }

/* generic scroll reveal */
.js-anim [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
  transition-delay: var(--d, 0ms);
}
.js-anim [data-reveal].in { opacity: 1; transform: none; }
.js-anim [data-reveal="scale"] { transform: translateY(18px) scale(0.94); }
.js-anim [data-reveal="left"] { transform: translateX(-36px); }
.js-anim [data-reveal="right"] { transform: translateX(36px); }

/* headings: word-by-word rise */
.split-words .w { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: 0.08em; margin-bottom: -0.08em; }
.split-words .w > span { display: inline-block; }
.js-anim .split-words .w > span { transform: translateY(110%); transition: transform 0.95s var(--ease); transition-delay: calc(var(--wi, 0) * 55ms); }
.js-anim .split-words.in .w > span { transform: none; }

/* autonomy track draws itself */
.js-anim .levels .lvl::before { transform: scaleX(0); transform-origin: 0 50%; transition: transform 0.7s var(--ease); transition-delay: var(--d, 0ms); }
.js-anim .levels .lvl.in::before { transform: scaleX(1); }
.js-anim .levels .lvl::after { transform: scale(0); transition: transform 0.5s var(--ease); transition-delay: var(--d, 0ms); }
.js-anim .levels .lvl.in::after { transform: scale(1); }
.js-anim .levels-range { clip-path: inset(0 100% 0 0); transition: clip-path 1.2s var(--ease) 0.9s; }
.js-anim .levels-range.in { clip-path: inset(-20px -20px 0 -20px); }
.lvl.in-range::after { animation: none; }
.js-anim .lvl.in-range.in::after { animation: node-glow 2.4s ease-in-out infinite; animation-delay: calc(var(--d, 0ms) + 0.8s); }
@keyframes node-glow { 50% { box-shadow: 0 0 26px 4px var(--cherenkov-glow); } }
@media (max-width: 900px) {
  .js-anim .levels .lvl::before { transform: scaleY(0); transform-origin: 50% 0; }
  .js-anim .levels .lvl.in::before { transform: scaleY(1); }
}

/* backbone tier breathes */
.js-anim .tier-core { animation: breathe 3.6s ease-in-out infinite; }
@keyframes breathe {
  50% { box-shadow: 0 0 0 1px var(--cherenkov-soft), 0 0 90px -10px var(--cherenkov-glow); }
}
.chips span { position: relative; overflow: hidden; }
.js-anim .chips span::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, transparent 30%, var(--cherenkov-soft) 50%, transparent 70%);
  transform: translateX(-100%);
  animation: chipshine 3.6s ease-in-out infinite;
}
.js-anim .chips span:nth-child(2)::after { animation-delay: 0.25s; }
.js-anim .chips span:nth-child(3)::after { animation-delay: 0.5s; }
@keyframes chipshine { 60%, 100% { transform: translateX(100%); } }

.js-anim .gate { animation: gate 2.2s ease-in-out infinite; }
@keyframes gate { 50% { background: rgba(255, 176, 32, 0.2); } }

/* cursor spotlight */
.spot { position: relative; }
.spot::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s var(--ease);
  background: radial-gradient(260px circle at var(--mx, 50%) var(--my, 50%), var(--cherenkov-soft), transparent 65%);
}
.spot:hover::after { opacity: 1; }

/* element tiles tilt in 3D */
.elements { perspective: 900px; }
.el { transform-style: preserve-3d; transition: transform 0.25s var(--ease), border-color 180ms var(--ease), background-color 180ms var(--ease), opacity 180ms var(--ease); }
.el .el-sym { transition: transform 0.25s var(--ease); }
.el:hover .el-sym { transform: translateZ(26px); }
.ed-sym.swap { animation: symswap 0.5s var(--ease); }
@keyframes symswap { from { opacity: 0; transform: translateY(14px) scale(0.92); filter: blur(6px); } }
.ed-desc.swap, .ed-name.swap { animation: fadeup 0.5s var(--ease); }

/* code panes type themselves */
.code pre .ln { display: block; min-height: 1.7em; }
.js-anim .code pre .ln { opacity: 0; transform: translateX(-8px); }
.js-anim .code.in pre .ln { animation: typeline 0.35s var(--ease) both; animation-delay: calc(var(--i, 0) * 90ms + 200ms); }
@keyframes typeline { to { opacity: 1; transform: none; } }
.code pre .caret {
  display: inline-block;
  width: 0.6em;
  height: 1.1em;
  vertical-align: -0.15em;
  margin-left: 2px;
  background: var(--cherenkov-hi);
}
.js-anim .code pre .caret { animation: caret 1s steps(1) infinite; }
@keyframes caret { 50% { opacity: 0; } }
.code figcaption span:first-child::before { content: "● ● ●"; letter-spacing: 3px; margin-right: 12px; color: var(--line-strong); }

/* product names: expand on reveal */
.js-anim .inst-name { letter-spacing: 0.25em; opacity: 0; transition: letter-spacing 1.2s var(--ease), opacity 0.8s var(--ease); }
.js-anim .instrument.in .inst-name { letter-spacing: -0.01em; opacity: 1; }

/* protocol bar fills */
.protocol { position: relative; }
.protocol::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--cherenkov), var(--cherenkov-hi));
  box-shadow: 0 0 12px var(--cherenkov-glow);
  transform-origin: 0 50%;
}
.js-anim .protocol::before { transform: scaleX(0); transition: transform 1.8s var(--ease) 0.2s; }
.js-anim .protocol.in::before { transform: scaleX(1); }
.pr-num { transition: color 0.4s var(--ease), text-shadow 0.4s var(--ease); }
.protocol li:hover .pr-num { color: var(--cherenkov-hi); text-shadow: 0 0 24px var(--cherenkov-glow); }

/* log rows: scanline sweep on reveal */
.log-row { position: relative; }
.js-anim .log-row:not(.log-head)::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cherenkov-hi), transparent);
  transform: scaleX(0);
}
.js-anim .log-row.in::before { animation: scan 1.4s var(--ease) both; animation-delay: var(--d, 0ms); }
@keyframes scan { 0% { transform: scaleX(0); opacity: 1; } 70% { transform: scaleX(1); opacity: 1; } 100% { transform: scaleX(1); opacity: 0; } }

/* rules: number lights up */
.rule-list li::before { transition: color 0.4s var(--ease), text-shadow 0.4s var(--ease); }
.rule-list li:hover::before { color: var(--text); text-shadow: 0 0 18px var(--cherenkov-glow); }
.rule-list li h3 { transition: transform 0.4s var(--ease); }
.rule-list li:hover h3 { transform: translateX(6px); }

/* contact: drifting Cherenkov pool */
.contact::before, .contact::after {
  content: "";
  position: absolute;
  z-index: -1;
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}
.contact { isolation: isolate; }
.contact::before {
  width: 520px; height: 520px; right: -120px; bottom: -260px;
  background: radial-gradient(circle, var(--cherenkov-glow), transparent 65%);
}
.contact::after {
  width: 360px; height: 360px; right: 30%; bottom: -220px;
  background: radial-gradient(circle, var(--cherenkov-soft), transparent 65%);
}
.js-anim .contact::before { animation: drift 14s ease-in-out infinite alternate; }
.js-anim .contact::after { animation: drift 11s ease-in-out infinite alternate-reverse; }
@keyframes drift { to { transform: translate(-140px, -60px) scale(1.15); } }

/* buttons: magnetic + shine */
.btn { will-change: transform; }
.btn-primary { position: relative; overflow: hidden; box-shadow: 0 0 0 0 var(--cherenkov-glow); }
.btn-primary:hover { box-shadow: 0 0 34px -4px var(--cherenkov-glow); }
.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, transparent 30%, rgba(255, 255, 255, 0.45) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform 0.7s var(--ease);
}
.btn-primary:hover::before { transform: translateX(120%); }

/* nav links: underline grows */
@media (min-width: 961px) {
  .nav-links a { border-bottom: 0; position: relative; }
  .nav-links a::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: 0;
    height: 1px;
    background: var(--cherenkov);
    transform: scaleX(0);
    transform-origin: 100% 50%;
    transition: transform 0.35s var(--ease);
  }
  .nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); transform-origin: 0 50%; }
  .nav-links a.active { color: var(--text); }
}

@media (prefers-reduced-motion: reduce) {
  body::after { animation: none; }
}