:root {
  color-scheme: dark;
  --bg: #091412;
  --surface: #10211d;
  --surface-bright: #153029;
  --ink: #f5f2e8;
  --muted: #a9bbb4;
  --line: rgba(225, 240, 232, 0.16);
  --accent: #b9f45c;
  --accent-dark: #142608;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 82% 10%, rgba(78, 169, 130, 0.15), transparent 27rem),
    var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header,
main,
footer {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.site-header {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 760;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: var(--accent);
  color: var(--accent-dark);
  font-size: 0.86rem;
  font-weight: 900;
}

nav {
  display: flex;
  gap: 30px;
  color: var(--muted);
  font-size: 0.92rem;
}

nav a,
.primary-action {
  transition: color 160ms ease, background 160ms ease, transform 160ms ease;
}

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

.hero {
  min-height: 680px;
  display: grid;
  grid-template-columns: minmax(0, 1.32fr) minmax(300px, 0.68fr);
  gap: clamp(42px, 8vw, 110px);
  align-items: center;
  padding: 90px 0;
}

.eyebrow,
.section-number,
.signal-label {
  margin: 0 0 24px;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(3.4rem, 7.4vw, 7.1rem);
  font-weight: 720;
  letter-spacing: -0.07em;
  line-height: 0.94;
}

.lead {
  max-width: 690px;
  margin: 34px 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.35rem);
}

.primary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 23px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-dark);
  font-weight: 800;
}

.primary-action:hover,
.primary-action:focus-visible {
  background: #d4ff8e;
  transform: translateY(-2px);
}

.signal-card {
  position: relative;
  overflow: hidden;
  padding: 38px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: linear-gradient(155deg, var(--surface-bright), var(--surface));
  box-shadow: 0 34px 80px rgba(0, 0, 0, 0.24);
}

.signal-card::before {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  top: -85px;
  right: -70px;
  border: 34px solid rgba(185, 244, 92, 0.11);
  border-radius: 50%;
}

.signal-title {
  margin: 0 0 48px;
  font-size: 2rem;
  font-weight: 720;
  letter-spacing: -0.04em;
}

.signal-card ul {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.signal-card li {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  color: #d9e5df;
}

.signal-card li span {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
}

.project-section,
.principles,
.privacy {
  display: grid;
  grid-template-columns: minmax(140px, 0.34fr) minmax(0, 1fr);
  gap: clamp(30px, 7vw, 100px);
  padding: 100px 0;
  border-top: 1px solid var(--line);
}

.project-section > div,
.privacy > div {
  max-width: 770px;
}

h2 {
  margin: 0 0 28px;
  font-size: clamp(2.2rem, 5vw, 4.5rem);
  letter-spacing: -0.055em;
  line-height: 1.03;
}

.project-section p:not(.section-number),
.privacy p:not(.section-number) {
  color: var(--muted);
  font-size: 1.08rem;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.principles-grid article {
  min-height: 280px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(16, 33, 29, 0.62);
}

.principles-grid article > span {
  color: var(--accent);
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h3 {
  margin: 50px 0 14px;
  font-size: 1.45rem;
  letter-spacing: -0.035em;
}

.principles-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

footer {
  min-height: 150px;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 36px;
  align-items: center;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.84rem;
}

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

@media (max-width: 820px) {
  .site-header {
    min-height: 74px;
  }

  nav {
    display: none;
  }

  .hero,
  .project-section,
  .principles,
  .privacy {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding: 72px 0;
  }

  h1 {
    font-size: clamp(3.3rem, 16vw, 5.5rem);
  }

  .signal-card {
    padding: 28px;
  }

  .project-section,
  .principles,
  .privacy {
    padding: 76px 0;
  }

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

  .principles-grid article {
    min-height: 210px;
  }

  footer {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 42px 0;
  }

  footer p {
    margin: 0;
  }
}

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

  * {
    transition: none !important;
  }
}