:root {
  color-scheme: dark;
  --bg: #071113;
  --surface: #0d1b1d;
  --surface-raised: #132528;
  --text: #f4f8f7;
  --muted: #a9b9b7;
  --line: #244043;
  --mint: #64e0b4;
  --mint-dark: #09271e;
  --amber: #ffbd59;
  --max: 72rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 80% 0%, rgba(100, 224, 180, 0.12), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
}

a {
  color: var(--mint);
  text-underline-offset: 0.2em;
}

a:hover {
  color: #92f1cf;
}

a:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 4px;
  border-radius: 0.2rem;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -6rem;
  z-index: 10;
  padding: 0.7rem 1rem;
  background: var(--text);
  color: var(--bg);
}

.skip-link:focus {
  top: 1rem;
}

.shell {
  width: min(calc(100% - 2rem), var(--max));
  margin-inline: auto;
}

header {
  border-bottom: 1px solid rgba(100, 224, 180, 0.15);
  background: rgba(7, 17, 19, 0.86);
  backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 5;
}

.nav {
  min-height: 4.7rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  font-weight: 750;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand svg {
  width: 2.25rem;
  height: 2.25rem;
  flex: none;
}

nav ul {
  display: flex;
  gap: 1.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

nav a {
  color: var(--muted);
  font-weight: 650;
  text-decoration: none;
}

nav a[aria-current="page"] {
  color: var(--text);
}

main {
  min-height: calc(100vh - 12rem);
}

.hero {
  padding: clamp(5rem, 10vw, 9rem) 0 5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(17rem, 0.75fr);
  gap: clamp(2rem, 7vw, 6rem);
  align-items: center;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--mint);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.1;
  letter-spacing: -0.035em;
}

h1 {
  margin: 0;
  font-size: clamp(3rem, 8vw, 6.9rem);
  max-width: 11ch;
}

.page-title {
  font-size: clamp(2.8rem, 7vw, 5.4rem);
}

h2 {
  margin: 0 0 1.2rem;
  font-size: clamp(2rem, 5vw, 3.6rem);
}

h3 {
  margin: 0 0 0.7rem;
  font-size: 1.3rem;
}

.lede {
  max-width: 43rem;
  margin: 1.6rem 0 0;
  color: #c8d5d3;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.1rem;
  border: 1px solid var(--mint);
  border-radius: 999px;
  background: var(--mint);
  color: #062016;
  font-weight: 800;
  text-decoration: none;
}

.button.secondary {
  background: transparent;
  color: var(--mint);
}

.signal {
  min-height: 23rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 2rem;
  background:
    linear-gradient(rgba(100, 224, 180, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(100, 224, 180, 0.07) 1px, transparent 1px),
    var(--surface);
  background-size: 2rem 2rem;
  box-shadow: 0 2rem 5rem rgba(0, 0, 0, 0.3);
}

.signal svg {
  width: min(78%, 19rem);
  filter: drop-shadow(0 1.5rem 2rem rgba(100, 224, 180, 0.14));
}

.section {
  padding: 5rem 0;
  border-top: 1px solid var(--line);
}

.section-copy {
  max-width: 48rem;
  color: var(--muted);
  font-size: 1.1rem;
}

.body-copy {
  color: var(--muted);
  font-size: 1.08rem;
}

.body-copy p:first-child {
  margin-top: 0;
}

.body-copy strong,
.plain-list strong {
  color: var(--text);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(18rem, 1.1fr);
  gap: clamp(2rem, 7vw, 6rem);
  align-items: start;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 3.5rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  background: var(--line);
}

.principle-grid article {
  min-height: 10rem;
  padding: 1.5rem;
  background: var(--surface);
}

.principle-grid strong,
.principle-grid span {
  display: block;
}

.principle-grid strong {
  margin-bottom: 0.8rem;
  color: var(--mint);
  font-size: 1.3rem;
}

.principle-grid span {
  color: var(--muted);
}

.workflow-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2.5rem;
}

.step-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.1rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  background: linear-gradient(145deg, var(--surface-raised), var(--surface));
}

.step-card p,
.evidence-list p {
  margin-bottom: 0;
  color: var(--muted);
}

.step-index {
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  border: 1px solid rgba(100, 224, 180, 0.45);
  border-radius: 50%;
  color: var(--mint);
  font-size: 0.78rem;
  font-weight: 850;
}

.band {
  background: rgba(13, 27, 29, 0.62);
}

.evidence-list {
  display: grid;
  gap: 0;
}

.evidence-list article {
  padding: 0 0 1.5rem;
  border-bottom: 1px solid var(--line);
}

.evidence-list article + article {
  padding-top: 1.5rem;
}

.plain-list {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding-left: 1.3rem;
}

.privacy-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(18rem, 1.1fr);
  gap: clamp(2rem, 7vw, 6rem);
  padding: clamp(2rem, 5vw, 3.5rem);
  border: 1px solid rgba(100, 224, 180, 0.38);
  border-radius: 1.5rem;
  background:
    radial-gradient(circle at 100% 0%, rgba(100, 224, 180, 0.12), transparent 22rem),
    var(--surface);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2.5rem;
}

.card {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  background: linear-gradient(145deg, var(--surface-raised), var(--surface));
}

.card p,
.prose p,
.prose li {
  color: var(--muted);
}

.card .number {
  display: block;
  margin-bottom: 2.5rem;
  color: var(--mint);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.notice {
  padding: 1.6rem;
  border: 1px solid rgba(255, 189, 89, 0.45);
  border-radius: 1.25rem;
  background: rgba(255, 189, 89, 0.07);
}

.notice strong {
  color: var(--amber);
}

.page-head {
  padding: clamp(4rem, 9vw, 7rem) 0 3.5rem;
}

.prose {
  max-width: 49rem;
  padding-bottom: 5rem;
}

.prose h2 {
  margin-top: 3.5rem;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.prose h3 {
  margin-top: 2rem;
}

.prose ul,
.prose ol {
  padding-left: 1.4rem;
}

.meta {
  color: var(--muted);
  font-size: 0.95rem;
}

footer {
  padding: 2.2rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: center;
}

.footer-row p {
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 1rem;
}

@media (max-width: 760px) {
  .hero,
  .grid,
  .split,
  .principle-grid,
  .workflow-grid,
  .privacy-panel {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 4rem;
  }

  .signal {
    min-height: 18rem;
  }

  .nav {
    align-items: flex-start;
    padding-block: 1rem;
  }

  nav ul,
  .footer-row {
    flex-direction: column;
  }

  nav ul {
    gap: 0.35rem;
    align-items: flex-end;
  }

  .step-card {
    grid-template-columns: 1fr;
  }

  .footer-row {
    align-items: flex-start;
  }
}

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