:root {
  --bg: #ffffff;
  --fg: #171717;
  --muted: #5c5c5c;
  --line: #e5e5e5;
  --card: #f5f5f5;
  --accent: #171717;
  --accent-fg: #fafafa;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f0f;
    --fg: #f2f2f2;
    --muted: #a3a3a3;
    --line: #262626;
    --card: #1a1a1a;
    --accent: #f2f2f2;
    --accent-fg: #171717;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a {
  color: inherit;
  text-underline-offset: 3px;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

header.site {
  border-bottom: 1px solid var(--line);
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  text-decoration: none;
}

.logo-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-fg);
  font-size: 18px;
}

nav.site a {
  color: var(--muted);
  font-size: 15px;
  text-decoration: none;
}

nav.site a:hover {
  color: var(--fg);
}

.hero {
  padding: 64px 0 40px;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(32px, 7vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.hero p {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 18px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 0 18px;
  border-radius: 10px;
  border: 1px solid var(--line);
  font-weight: 600;
  text-decoration: none;
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-fg);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  padding: 0 0 56px;
  margin: 0;
  list-style: none;
}

.features li {
  padding: 18px;
  border-radius: 12px;
  background: var(--card);
}

.features strong {
  display: block;
  margin-bottom: 4px;
}

.features span {
  color: var(--muted);
  font-size: 15px;
}

section.block {
  padding: 0 0 48px;
}

section.block h2 {
  margin: 0 0 12px;
  font-size: 22px;
}

dl.contacts {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 8px 20px;
  margin: 0;
}

dl.contacts dt {
  color: var(--muted);
}

dl.contacts dd {
  margin: 0;
}

footer.site {
  border-top: 1px solid var(--line);
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 14px;
}

footer.site p {
  margin: 0 0 6px;
}

article.doc {
  padding: 40px 0 56px;
}

article.doc h1 {
  margin: 0 0 8px;
  font-size: clamp(28px, 6vw, 36px);
  line-height: 1.2;
}

article.doc .meta {
  margin: 0 0 32px;
  color: var(--muted);
}

article.doc h2 {
  margin: 36px 0 10px;
  font-size: 20px;
}

article.doc ul {
  padding-left: 22px;
}

article.doc li {
  margin-bottom: 6px;
}

@media (max-width: 520px) {
  dl.contacts {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  dl.contacts dd {
    margin-bottom: 10px;
  }
}