:root {
  color-scheme: dark;
  --ink: #eaf2f2;
  --muted: #9bb0b5;
  --deep: #06151d;
  --deep-soft: #0b212b;
  --panel: rgba(15, 43, 53, 0.78);
  --line: rgba(151, 197, 197, 0.2);
  --mint: #77e4c8;
  --lime: #c9ef84;
  --blue: #75a9ff;
  --max: 1200px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 84% 7%, rgba(57, 153, 154, 0.18), transparent 29rem),
    radial-gradient(circle at 4% 34%, rgba(35, 82, 124, 0.18), transparent 26rem),
    var(--deep);
  line-height: 1.6;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  color: var(--deep);
  background: var(--mint);
  border-radius: 0.35rem;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header,
main,
footer {
  width: min(calc(100% - 2.5rem), var(--max));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 6rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.96rem;
  font-weight: 760;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2.25rem;
  aspect-ratio: 1;
  place-items: center;
  color: var(--deep);
  background: linear-gradient(145deg, var(--mint), var(--lime));
  border-radius: 0.6rem 0.6rem 0.6rem 0.15rem;
  font-weight: 900;
}

nav {
  display: flex;
  gap: clamp(1rem, 3vw, 2.25rem);
}

nav a {
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

nav a:hover,
nav a:focus-visible {
  color: var(--mint);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(22rem, 0.85fr);
  gap: clamp(3rem, 8vw, 7rem);
  align-items: center;
  min-height: 43rem;
  padding-block: 5.5rem;
}

.eyebrow {
  margin: 0 0 1.2rem;
  color: var(--mint);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.19em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 12ch;
  margin-bottom: 1.6rem;
  font-size: clamp(3.25rem, 7.2vw, 6.8rem);
  font-weight: 760;
  letter-spacing: -0.065em;
  line-height: 0.96;
}

h2 {
  margin-bottom: 1.25rem;
  font-size: clamp(2.3rem, 4.6vw, 4.5rem);
  letter-spacing: -0.045em;
  line-height: 1.02;
}

h3 {
  margin-bottom: 0.65rem;
  font-size: 1.18rem;
  line-height: 1.25;
}

.hero-lede {
  max-width: 42rem;
  margin-bottom: 2.2rem;
  color: #bfd0d3;
  font-size: clamp(1.08rem, 2vw, 1.3rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.button {
  display: inline-flex;
  min-height: 3.2rem;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  font-size: 0.88rem;
  font-weight: 750;
  text-decoration: none;
}

.button-primary {
  color: var(--deep);
  background: var(--mint);
  border-color: var(--mint);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--lime);
  border-color: var(--lime);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: var(--mint);
}

.signal-map {
  position: relative;
  min-height: 28rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    rgba(7, 28, 37, 0.6);
  background-size: 3rem 3rem;
  box-shadow: inset 0 0 7rem rgba(14, 77, 83, 0.16);
}

.signal-map::before,
.signal-map::after {
  position: absolute;
  content: "";
  inset: 13%;
  border: 1px dashed rgba(119, 228, 200, 0.28);
  border-radius: 50%;
}

.signal-map::after {
  inset: 31%;
  border-style: solid;
}

.signal-core {
  position: absolute;
  z-index: 2;
  left: 50%;
  top: 50%;
  display: grid;
  width: 8rem;
  aspect-ratio: 1;
  place-content: center;
  text-align: center;
  color: var(--deep);
  background: linear-gradient(145deg, var(--mint), var(--lime));
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 4rem rgba(119, 228, 200, 0.2);
}

.signal-core span {
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.signal-core strong {
  font-size: 1.35rem;
}

.signal {
  position: absolute;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.6rem 0.8rem;
  color: #d8e7e8;
  background: rgba(7, 26, 34, 0.92);
  border: 1px solid var(--line);
  border-radius: 2rem;
  font-size: 0.76rem;
  font-weight: 680;
  white-space: nowrap;
}

.signal span {
  color: var(--mint);
  font-size: 0.64rem;
}

.signal-one { left: -2%; top: 16%; }
.signal-two { right: -4%; top: 25%; }
.signal-three { right: 2%; bottom: 14%; }
.signal-four { left: -3%; bottom: 21%; }

.statement {
  margin-bottom: 8rem;
  padding: clamp(2rem, 5vw, 4.5rem);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.statement p {
  max-width: 38ch;
  margin: 0;
  font-size: clamp(1.75rem, 4vw, 3.6rem);
  font-weight: 620;
  letter-spacing: -0.035em;
  line-height: 1.16;
}

.section {
  padding-block: 6rem;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(18rem, 0.7fr);
  column-gap: 5rem;
  align-items: end;
  margin-bottom: 4rem;
}

.section-heading .eyebrow {
  grid-column: 1 / -1;
}

.section-heading h2,
.section-heading p {
  margin-bottom: 0;
}

.section-heading > p:last-child {
  color: var(--muted);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.steps li {
  min-height: 19rem;
  padding: 1.5rem;
  border-right: 1px solid var(--line);
}

.steps li:first-child {
  border-left: 1px solid var(--line);
}

.step-number,
.capability-code {
  display: block;
  margin-bottom: 4.5rem;
  color: var(--mint);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.steps p,
.capability-grid p,
.principles-list p,
.closing > p:not(.eyebrow) {
  color: var(--muted);
  font-size: 0.92rem;
}

.capabilities {
  position: relative;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  overflow: hidden;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
}

.capability-grid article {
  min-height: 19rem;
  padding: 2rem;
  background: var(--deep-soft);
}

.capability-grid .capability-code {
  margin-bottom: 4rem;
}

.capability-grid .accent-card {
  color: var(--deep);
  background: var(--lime);
}

.accent-card .capability-code,
.accent-card p {
  color: #254437;
}

.principles {
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  gap: clamp(3rem, 9vw, 8rem);
}

.principles-list article {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 2rem;
  padding-block: 1.65rem;
  border-top: 1px solid var(--line);
}

.principles-list article:last-child {
  border-bottom: 1px solid var(--line);
}

.principles-list h3,
.principles-list p {
  margin: 0;
}

.closing {
  margin-block: 5rem 8rem;
  padding: clamp(2.5rem, 7vw, 6rem);
  background: linear-gradient(135deg, rgba(22, 71, 76, 0.72), rgba(11, 33, 43, 0.72));
  border: 1px solid rgba(119, 228, 200, 0.25);
  border-radius: 1rem;
}

.closing h2 {
  max-width: 14ch;
}

.closing > p:not(.eyebrow) {
  max-width: 48rem;
  margin-bottom: 2rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 0.7rem;
  color: #bfd0d3;
  border: 1px solid var(--line);
  border-radius: 2rem;
  font-size: 0.72rem;
  font-weight: 720;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.status-pill span {
  width: 0.5rem;
  aspect-ratio: 1;
  background: var(--lime);
  border-radius: 50%;
  box-shadow: 0 0 0.7rem var(--lime);
}

footer {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 2rem;
  align-items: center;
  min-height: 10rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
}

footer p {
  margin: 0;
}

.footer-brand {
  color: var(--ink);
}

.privacy-note {
  text-align: right;
}

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
}

@media (max-width: 920px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .signal-map {
    width: min(100%, 34rem);
    margin-inline: auto;
  }

  .section-heading,
  .principles {
    grid-template-columns: 1fr;
  }

  .section-heading {
    align-items: start;
    row-gap: 1.25rem;
  }

  .steps,
  .capability-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps li:nth-child(3) {
    border-left: 1px solid var(--line);
  }

  footer {
    grid-template-columns: 1fr 1fr;
  }

  .privacy-note {
    text-align: left;
  }
}

@media (max-width: 620px) {
  .site-header {
    min-height: 5rem;
  }

  nav {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-block: 4rem;
  }

  h1 {
    font-size: clamp(3rem, 15vw, 4.8rem);
  }

  .signal-map {
    min-height: 23rem;
  }

  .signal {
    font-size: 0.68rem;
  }

  .signal-one { left: 0; }
  .signal-two { right: 0; }
  .signal-three { right: 0; }
  .signal-four { left: 0; }

  .statement,
  .section {
    margin-bottom: 2rem;
    padding-block: 4rem;
  }

  .steps,
  .capability-grid,
  .principles-list article,
  footer {
    grid-template-columns: 1fr;
  }

  .steps li,
  .steps li:nth-child(3) {
    min-height: auto;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }

  .step-number,
  .capability-grid .capability-code {
    margin-bottom: 2.5rem;
  }

  footer {
    padding-block: 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}