:root {
  color-scheme: light dark;
  --bg: #0c1117;
  --panel: #111a24;
  --panel-soft: #162232;
  --text: #edf4fb;
  --muted: #a9b7c6;
  --accent: #6ee7b7;
  --accent-strong: #34d399;
  --line: rgba(255, 255, 255, 0.11);
  --shadow: rgba(0, 0, 0, 0.24);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 18% 12%, rgba(52, 211, 153, 0.17), transparent 32rem),
    radial-gradient(circle at 82% 8%, rgba(96, 165, 250, 0.14), transparent 34rem),
    var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.4rem 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-weight: 720;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  width: 2.4rem;
  height: 2.4rem;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: rgba(255, 255, 255, 0.06);
  color: var(--accent);
  font-size: 0.82rem;
}

nav {
  display: flex;
  gap: 1.2rem;
  color: var(--muted);
  font-size: 0.95rem;
}

nav a {
  text-decoration: none;
}

nav a:hover {
  color: var(--text);
}

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.hero {
  min-height: 72vh;
  display: grid;
  align-content: center;
  padding: 4rem 0 6rem;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 860px;
  margin-bottom: 1.4rem;
  font-size: clamp(3.2rem, 9vw, 6.8rem);
  line-height: 0.94;
  letter-spacing: -0.075em;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.055em;
}

h3 {
  margin-bottom: 0.75rem;
  font-size: 1.2rem;
  letter-spacing: -0.025em;
}

.hero-copy {
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.7rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.75rem 1.05rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
}

.button.primary {
  background: var(--accent);
  color: #04130e;
}

.button.primary:hover {
  background: var(--accent-strong);
}

.button.secondary {
  border: 1px solid var(--line);
  color: var(--text);
}

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

.section-heading {
  max-width: 760px;
  margin-bottom: 2rem;
}

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

.card {
  min-height: 16rem;
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: 1.3rem;
  background: linear-gradient(180deg, var(--panel-soft), var(--panel));
  box-shadow: 0 1rem 2.5rem var(--shadow);
}

.card p,
.principles p,
.contact p,
footer {
  color: var(--muted);
}

.cards.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.1rem;
  margin-top: 1.1rem;
  font-size: 0.92rem;
  font-weight: 700;
}

.paper-links a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

.paper-links .pending {
  color: var(--muted);
  font-weight: 500;
}

.split {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 4rem;
}

.principles {
  display: grid;
  gap: 1rem;
}

.status {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.05);
}

.contact {
  max-width: 760px;
}

.contact a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  max-width: 1120px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
}

@media (max-width: 780px) {
  .site-header,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    min-height: auto;
    padding-top: 3rem;
  }

  .cards,
  .cards.two-col,
  .split {
    grid-template-columns: 1fr;
  }

  .split {
    gap: 1.5rem;
  }
}