:root {
  color-scheme: dark;
  --background: #09101c;
  --surface: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.11);
  --text: #f5f7fa;
  --muted: rgba(245, 247, 250, 0.68);
  --accent: #5cdbba;
  --accent-ink: #071713;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 15% -10%, rgba(92, 219, 186, 0.18), transparent 32rem),
    var(--background);
  font-family:
    Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", sans-serif;
  line-height: 1.7;
}

a {
  color: var(--accent);
}

.shell {
  width: min(900px, calc(100% - 40px));
  margin: 0 auto;
}

header {
  padding: 56px 0 24px;
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 750;
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
}

.hero {
  padding: 80px 0 72px;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  max-width: 720px;
  margin: 12px 0 20px;
  font-size: clamp(2.7rem, 8vw, 5.5rem);
  line-height: 1.03;
  letter-spacing: -0.055em;
}

.lead {
  max-width: 690px;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text);
  background: var(--surface);
  font-weight: 700;
  text-decoration: none;
}

.button.primary {
  border-color: transparent;
  color: var(--accent-ink);
  background: var(--accent);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding-bottom: 80px;
}

.card,
.document {
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--surface);
  backdrop-filter: blur(16px);
}

.card {
  padding: 24px;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.document {
  margin: 48px 0 80px;
  padding: clamp(24px, 6vw, 56px);
}

.document h1 {
  font-size: clamp(2rem, 5vw, 3.7rem);
}

.document h2 {
  margin: 2.1em 0 0.55em;
  font-size: 1.35rem;
}

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

.document strong {
  color: var(--text);
}

.language-note,
.meta {
  color: var(--muted);
  font-size: 0.92rem;
}

hr {
  margin: 48px 0;
  border: 0;
  border-top: 1px solid var(--border);
}

footer {
  padding: 24px 0 48px;
  color: var(--muted);
  font-size: 0.88rem;
}

@media (max-width: 720px) {
  header {
    padding-top: 28px;
  }

  nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    padding-top: 52px;
  }

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