:root {
  color-scheme: light dark;
  --bg: #f5f6fb;
  --surface: rgba(255, 255, 255, 0.9);
  --text: #111218;
  --muted: #626571;
  --line: rgba(17, 18, 24, 0.1);
  --accent: #00c853;
  --accent-dark: #008d3a;
  --shadow: 0 18px 50px rgba(34, 39, 52, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 85% -10%, rgba(0, 200, 83, 0.15), transparent 34rem),
    var(--bg);
  line-height: 1.65;
}

a {
  color: var(--accent-dark);
  text-underline-offset: 0.16em;
}

.shell {
  width: min(880px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  padding: 28px 0 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--text);
  text-decoration: none;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 10px;
  color: white;
  background: var(--accent);
  font-size: 19px;
  font-weight: 850;
}

main {
  padding: 28px 0 64px;
}

.hero,
.document,
.card {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero,
.document {
  border-radius: 28px;
  padding: clamp(28px, 6vw, 58px);
}

h1,
h2 {
  letter-spacing: -0.035em;
  line-height: 1.14;
}

h1 {
  max-width: 720px;
  margin: 0 0 18px;
  font-size: clamp(2.25rem, 7vw, 4.5rem);
}

.document h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
}

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

p,
ul {
  margin: 0.8em 0;
}

.lead {
  max-width: 650px;
  color: var(--muted);
  font-size: 1.13rem;
}

.meta {
  margin-bottom: 32px;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.card {
  display: block;
  padding: 22px;
  border-radius: 20px;
  color: var(--text);
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 200, 83, 0.45);
}

.card strong {
  display: block;
  margin-bottom: 6px;
}

.card span,
.note {
  color: var(--muted);
}

.callout {
  margin: 24px 0;
  padding: 18px 20px;
  border-left: 4px solid var(--accent);
  border-radius: 0 14px 14px 0;
  background: rgba(0, 200, 83, 0.08);
}

footer {
  padding: 0 0 42px;
  color: var(--muted);
  font-size: 0.9rem;
}

footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-bottom: 10px;
}

@media (max-width: 680px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .hero,
  .document {
    border-radius: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .card {
    transition: none;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1015;
    --surface: rgba(25, 27, 34, 0.92);
    --text: #f5f6f8;
    --muted: #b1b4bf;
    --line: rgba(255, 255, 255, 0.1);
    --accent-dark: #55df87;
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.2);
  }
}