:root {
  color-scheme: dark;
  --ink: #f4f8fb;
  --muted: #9aaab8;
  --quiet: #657581;
  --surface: #0b1116;
  --line: rgba(169, 199, 218, 0.15);
  --line-strong: rgba(169, 199, 218, 0.28);
  --signal: #60dfff;
  --signal-bright: #b8f3ff;
  --warm: #ffb36b;
  --success: #83f2bf;
  --max-width: 1240px;
  --page-gutter: clamp(1.25rem, 4vw, 4rem);
  --font-sans: "Segoe UI Variable", "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--surface); }
body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 82% 8%, rgba(32, 132, 165, 0.15), transparent 29rem),
    radial-gradient(circle at 12% 38%, rgba(35, 85, 105, 0.09), transparent 34rem),
    var(--surface);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(154, 183, 202, 0.034) 1px, transparent 1px),
    linear-gradient(90deg, rgba(154, 183, 202, 0.034) 1px, transparent 1px);
  background-size: 4.5rem 4.5rem;
  mask-image: linear-gradient(to bottom, black 0, transparent 75%);
}

a { color: inherit; text-decoration-color: rgba(96, 223, 255, 0.45); text-underline-offset: 0.2em; }
a:hover { text-decoration-color: var(--signal); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--signal); outline-offset: 4px; }
button, a { -webkit-tap-highlight-color: transparent; }

.skip-link {
  position: absolute;
  top: -5rem;
  left: var(--page-gutter);
  z-index: 20;
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: var(--surface);
  font-weight: 700;
}
.skip-link:focus { top: 0.75rem; }

.site-header {
  position: relative;
  z-index: 10;
  width: min(100%, calc(var(--max-width) + 2 * var(--page-gutter)));
  margin: 0 auto;
  padding: 1.5rem var(--page-gutter) 0;
}
.nav-shell {
  display: flex;
  min-height: 4.25rem;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 750;
  letter-spacing: -0.015em;
  text-decoration: none;
}
.brand-mark {
  position: relative;
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border: 1px solid var(--line-strong);
  color: var(--signal-bright);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: -0.06em;
}
.brand-mark::before, .brand-mark::after { position: absolute; width: 0.35rem; height: 0.35rem; content: ""; }
.brand-mark::before { top: -1px; left: -1px; border-top: 1px solid var(--signal); border-left: 1px solid var(--signal); }
.brand-mark::after { right: -1px; bottom: -1px; border-right: 1px solid var(--signal); border-bottom: 1px solid var(--signal); }
.brand-muted { color: var(--muted); font-weight: 500; }
.nav-links { display: flex; align-items: center; gap: clamp(1rem, 2.5vw, 2rem); }
.nav-link { color: var(--muted); font-size: 0.9rem; font-weight: 600; text-decoration: none; }
.nav-link:hover { color: var(--ink); }
.nav-contact {
  display: inline-flex;
  min-height: 2.5rem;
  align-items: center;
  gap: 0.55rem;
  padding: 0 0.9rem;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
  transition: border-color 180ms ease, background-color 180ms ease;
}
.nav-contact:hover { border-color: rgba(96, 223, 255, 0.6); background: rgba(96, 223, 255, 0.06); }
.nav-contact::after { color: var(--signal); content: "↗"; }
.page-shell { width: min(100%, calc(var(--max-width) + 2 * var(--page-gutter))); margin: 0 auto; padding-inline: var(--page-gutter); }

.hero {
  position: relative;
  display: grid;
  min-height: 47rem;
  grid-template-columns: minmax(0, 1.2fr) minmax(20rem, 0.8fr);
  align-items: center;
  gap: clamp(3rem, 7vw, 7rem);
  padding-block: clamp(5.75rem, 11vw, 9.5rem);
}
.hero::after { position: absolute; right: 0; bottom: 0; left: 0; height: 1px; content: ""; background: linear-gradient(90deg, var(--line-strong), var(--line), transparent); }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.72rem;
  margin: 0 0 1.65rem;
  color: var(--signal-bright);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  line-height: 1.4;
  text-transform: uppercase;
}
.eyebrow::before { width: 1.75rem; height: 1px; background: var(--signal); content: ""; box-shadow: 0 0 0.8rem rgba(96, 223, 255, 0.6); }
.hero h1 { max-width: 12ch; margin: 0; font-size: clamp(3.35rem, 7.3vw, 7.2rem); font-weight: 620; letter-spacing: -0.065em; line-height: 0.9; }
.hero h1 span { display: block; color: var(--muted); font-weight: 420; }
.hero-lede { max-width: 40rem; margin: 2rem 0 0; color: #c0ccd5; font-size: clamp(1.08rem, 1.7vw, 1.28rem); line-height: 1.65; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.85rem; margin-top: 2.25rem; }
.button {
  display: inline-flex;
  min-height: 3.15rem;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  padding: 0.78rem 1.1rem;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  font-size: 0.93rem;
  font-weight: 720;
  text-decoration: none;
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease;
}
.button:hover { transform: translateY(-2px); border-color: rgba(96, 223, 255, 0.65); }
.button-primary { border-color: var(--signal-bright); background: var(--signal-bright); color: #061015; }
.button-primary:hover { border-color: #e0faff; background: #e0faff; }
.button-arrow { color: var(--signal); }
.button-primary .button-arrow { color: inherit; }

.instrument {
  position: relative;
  width: 100%;
  min-height: 30rem;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(rgba(96, 223, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(96, 223, 255, 0.055) 1px, transparent 1px),
    linear-gradient(145deg, rgba(17, 30, 39, 0.96), rgba(8, 14, 19, 0.92));
  background-size: 2.1rem 2.1rem, 2.1rem 2.1rem, auto;
  box-shadow: 0 2.5rem 8rem rgba(0, 0, 0, 0.34), inset 0 1px rgba(255, 255, 255, 0.025);
  overflow: hidden;
  transition: transform 180ms ease-out;
}
.instrument::before { position: absolute; top: -25%; right: -30%; width: 90%; aspect-ratio: 1; border-radius: 50%; background: rgba(45, 192, 234, 0.14); content: ""; filter: blur(3.5rem); }
.instrument-header { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 1.15rem; border-bottom: 1px solid var(--line); color: var(--muted); font-family: var(--font-mono); font-size: 0.71rem; letter-spacing: 0.08em; text-transform: uppercase; }
.instrument-status { display: inline-flex; align-items: center; gap: 0.5rem; color: var(--success); }
.status-dot { width: 0.42rem; height: 0.42rem; border-radius: 50%; background: currentColor; box-shadow: 0 0 0 0 rgba(131, 242, 191, 0.35); animation: status-pulse 3s ease-out infinite; }
.instrument-field { position: relative; display: grid; min-height: 24rem; place-items: center; padding: 2rem; }
.orbit { position: absolute; width: 17rem; height: 17rem; border: 1px solid rgba(96, 223, 255, 0.22); border-radius: 50%; animation: turn 28s linear infinite; }
.orbit::before, .orbit::after { position: absolute; border-radius: 50%; content: ""; }
.orbit::before { top: 1.15rem; left: 1.6rem; width: 0.55rem; height: 0.55rem; background: var(--signal); box-shadow: 0 0 1.2rem var(--signal); }
.orbit::after { right: 2.3rem; bottom: 0.7rem; width: 0.35rem; height: 0.35rem; background: var(--warm); box-shadow: 0 0 1rem var(--warm); }
.orbit-secondary { width: 11rem; height: 11rem; border-style: dashed; opacity: 0.6; animation-direction: reverse; animation-duration: 19s; }
.core { position: relative; z-index: 2; display: grid; width: 7.6rem; aspect-ratio: 1; place-items: center; border: 1px solid rgba(184, 243, 255, 0.38); border-radius: 50%; background: rgba(8, 20, 27, 0.82); box-shadow: 0 0 3rem rgba(96, 223, 255, 0.17), inset 0 0 2rem rgba(96, 223, 255, 0.06); color: var(--signal-bright); font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; text-align: center; text-transform: uppercase; }
.core::before, .core::after { position: absolute; background: linear-gradient(90deg, transparent, rgba(96, 223, 255, 0.6), transparent); content: ""; }
.core::before { width: 13rem; height: 1px; }
.core::after { width: 1px; height: 13rem; background: linear-gradient(transparent, rgba(96, 223, 255, 0.6), transparent); }
.field-label { position: absolute; padding: 0.35rem 0.5rem; border-left: 1px solid var(--signal); background: rgba(6, 13, 18, 0.72); color: var(--muted); font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; }
.field-label strong { display: block; margin-bottom: 0.08rem; color: var(--ink); font-size: 0.72rem; font-weight: 600; }
.label-source { top: 18%; left: 7%; }
.label-checks { right: 6%; bottom: 22%; }
.label-output { bottom: 8%; left: 13%; }
.instrument-footer { position: relative; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.instrument-metric { padding: 0.85rem 1rem; border-right: 1px solid var(--line); color: var(--quiet); font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.08em; text-transform: uppercase; }
.instrument-metric:last-child { border-right: 0; }
.instrument-metric strong { display: block; margin-top: 0.16rem; color: var(--ink); font-size: 0.74rem; font-weight: 500; letter-spacing: 0; text-transform: none; }

.principle-strip { display: grid; grid-template-columns: 0.75fr repeat(3, 1fr); border-bottom: 1px solid var(--line); }
.strip-label, .principle { min-height: 8.8rem; padding: 1.7rem 1.45rem; border-right: 1px solid var(--line); }
.principle:last-child { border-right: 0; }
.strip-label { display: flex; align-items: flex-start; color: var(--quiet); font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; }
.principle-index { display: block; margin-bottom: 1.15rem; color: var(--signal); font-family: var(--font-mono); font-size: 0.68rem; }
.principle strong { display: block; color: var(--ink); font-size: 1rem; font-weight: 650; }
.principle p { margin: 0.45rem 0 0; color: var(--muted); font-size: 0.9rem; line-height: 1.55; }

.section { position: relative; padding-block: clamp(5.5rem, 10vw, 9rem); border-bottom: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: minmax(9rem, 0.38fr) minmax(0, 1fr); gap: clamp(2rem, 6vw, 6rem); margin-bottom: clamp(3rem, 6vw, 5rem); }
.kicker { margin: 0; color: var(--signal-bright); font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.section-title { max-width: 18ch; margin: 0; font-size: clamp(2.4rem, 5vw, 5rem); font-weight: 520; letter-spacing: -0.055em; line-height: 0.98; }
.section-title .dim { color: var(--quiet); }
.focus-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.focus-card { position: relative; min-height: 25rem; padding: 2rem; border-top: 1px solid var(--line-strong); border-right: 1px solid var(--line); background: linear-gradient(180deg, rgba(21, 31, 40, 0.42), transparent); transition: background-color 180ms ease, transform 180ms ease; }
.focus-card:first-child { border-left: 1px solid var(--line); }
.focus-card:hover { z-index: 2; background: rgba(18, 35, 45, 0.65); transform: translateY(-0.4rem); }
.card-index { color: var(--signal); font-family: var(--font-mono); font-size: 0.72rem; }
.focus-card h3 { max-width: 10ch; margin: 5.75rem 0 1rem; font-size: clamp(1.55rem, 2.5vw, 2.2rem); font-weight: 600; letter-spacing: -0.04em; line-height: 1.05; }
.focus-card p { margin: 0; color: var(--muted); line-height: 1.7; }
.card-line { position: absolute; right: 2rem; bottom: 2rem; left: 2rem; height: 1px; background: linear-gradient(90deg, var(--signal), rgba(96, 223, 255, 0.05)); transform: scaleX(0.24); transform-origin: left; transition: transform 400ms cubic-bezier(0.2, 0.75, 0.25, 1); }
.focus-card:hover .card-line { transform: scaleX(1); }

.method-layout { display: grid; grid-template-columns: minmax(15rem, 0.45fr) minmax(0, 1fr); gap: clamp(3rem, 7vw, 8rem); align-items: start; }
.method-intro { position: sticky; top: 2rem; }
.method-intro h2 { margin: 0 0 1.4rem; font-size: clamp(2.3rem, 4.5vw, 4.4rem); font-weight: 540; letter-spacing: -0.055em; line-height: 0.98; }
.method-intro p { margin: 0; color: var(--muted); font-size: 1.04rem; }
.method-list { border-top: 1px solid var(--line-strong); }
.method-item { display: grid; grid-template-columns: 3.25rem minmax(0, 1fr); gap: 1.25rem; padding: 2.1rem 0; border-bottom: 1px solid var(--line); }
.method-number { color: var(--signal); font-family: var(--font-mono); font-size: 0.72rem; }
.method-item h3 { margin: 0 0 0.55rem; font-size: 1.22rem; font-weight: 650; letter-spacing: -0.025em; }
.method-item p { max-width: 42rem; margin: 0; color: var(--muted); }

.availability { overflow: hidden; }
.availability::before { position: absolute; right: -10rem; bottom: -24rem; width: 42rem; aspect-ratio: 1; border: 1px solid rgba(96, 223, 255, 0.13); border-radius: 50%; content: ""; box-shadow: 0 0 0 5rem rgba(96, 223, 255, 0.025), 0 0 0 11rem rgba(96, 223, 255, 0.015); }
.availability-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.55fr); gap: clamp(3rem, 8vw, 9rem); align-items: end; }
.availability h2 { max-width: 16ch; margin: 0; font-size: clamp(2.65rem, 5.8vw, 5.8rem); font-weight: 520; letter-spacing: -0.06em; line-height: 0.96; }
.availability h2 span { color: var(--quiet); }
.availability-copy { padding-top: 1rem; }
.availability-copy p { margin: 0 0 1.75rem; color: var(--muted); font-size: 1.04rem; }

.site-footer { display: grid; grid-template-columns: 1fr auto; gap: 2rem; padding-block: 2.2rem 3rem; color: var(--quiet); font-size: 0.82rem; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 1.25rem; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--ink); }

.legal-page .site-header { padding-top: 0; }
.legal-page .nav-shell { min-height: 5.5rem; }
.legal-shell { display: grid; grid-template-columns: minmax(12rem, 0.35fr) minmax(0, 1fr); gap: clamp(3rem, 8vw, 8rem); padding-block: clamp(4.5rem, 9vw, 8rem); }
.legal-aside { align-self: start; }
.legal-aside a { color: var(--muted); font-size: 0.9rem; text-decoration: none; }
.legal-aside a:hover { color: var(--ink); }
.legal-content { max-width: 48rem; }
.legal-content h1 { margin: 0; font-size: clamp(3rem, 7vw, 6.5rem); font-weight: 540; letter-spacing: -0.065em; line-height: 0.92; }
.legal-lede { margin: 1.6rem 0 0; color: #c0ccd5; font-size: 1.08rem; }
.legal-meta { display: flex; gap: 0.6rem; align-items: center; margin: 1.25rem 0 4rem; color: var(--quiet); font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; }
.legal-meta::before { width: 1.5rem; height: 1px; background: var(--signal); content: ""; }
.legal-content h2 { margin: 3rem 0 0.8rem; font-size: 1.22rem; font-weight: 650; letter-spacing: -0.025em; }
.legal-content p, .legal-content li { color: var(--muted); line-height: 1.78; }
.legal-content ul { padding-left: 1.35rem; }
.legal-content li + li { margin-top: 0.45rem; }
.legal-content a { color: var(--ink); }

@keyframes turn { to { transform: rotate(360deg); } }
@keyframes status-pulse { 0% { box-shadow: 0 0 0 0 rgba(131, 242, 191, 0.3); } 55%, 100% { box-shadow: 0 0 0 0.65rem rgba(131, 242, 191, 0); } }

@media (max-width: 900px) {
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 4rem; }
  .hero-copy { max-width: 48rem; }
  .instrument { max-width: 38rem; margin-inline: auto; }
  .principle-strip { grid-template-columns: repeat(3, 1fr); }
  .strip-label { min-height: auto; grid-column: 1 / -1; border-right: 0; border-bottom: 1px solid var(--line); }
  .section-heading, .method-layout, .availability-grid, .legal-shell { grid-template-columns: 1fr; }
  .section-heading { gap: 1.4rem; }
  .method-intro { position: static; max-width: 40rem; }
  .legal-shell { gap: 2.5rem; }
}

@media (max-width: 680px) {
  .site-header { padding-top: 0.75rem; }
  .nav-shell { min-height: 3.8rem; }
  .nav-links .nav-link { display: none; }
  .nav-contact { min-height: 2.65rem; }
  .hero { padding-block: 5.3rem 4.5rem; }
  .hero h1 { font-size: clamp(3.05rem, 16vw, 5.1rem); }
  .instrument { min-height: 26rem; }
  .instrument-field { min-height: 20rem; padding: 1rem; }
  .orbit { width: 13rem; height: 13rem; }
  .orbit-secondary { width: 8.5rem; height: 8.5rem; }
  .core { width: 6.25rem; }
  .core::before { width: 9rem; }
  .core::after { height: 9rem; }
  .field-label { font-size: 0.6rem; }
  .label-source { top: 12%; left: 4%; }
  .label-checks { right: 4%; bottom: 16%; }
  .label-output { bottom: 5%; left: 5%; }
  .instrument-footer { grid-template-columns: 1fr; }
  .instrument-metric { border-right: 0; border-bottom: 1px solid var(--line); }
  .instrument-metric:last-child { border-bottom: 0; }
  .principle-strip, .focus-grid { grid-template-columns: 1fr; }
  .principle, .principle:last-child { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .principle:last-child { border-bottom: 0; }
  .focus-card, .focus-card:first-child { min-height: 19rem; border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .focus-card h3 { margin-top: 3.8rem; }
  .section { padding-block: 5.5rem; }
  .method-item { grid-template-columns: 2.5rem minmax(0, 1fr); }
  .site-footer { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
}

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