:root {
  --bg: #0b0f14;
  --surface: #111820;
  --surface-2: #151f29;
  --text: #f4f7fa;
  --muted: #a9b4c0;
  --line: #25313d;
  --accent: #63e6ad;
  --accent-soft: #b5f9d5;
  --max: 980px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.68;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(11, 15, 20, .92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav {
  width: min(var(--max), calc(100% - 32px));
  min-height: 66px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  font-size: 1.08rem;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: .92rem;
}

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

main {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  padding: 58px 0 84px;
}

article {
  max-width: 880px;
}

h1, h2, h3 {
  line-height: 1.18;
  letter-spacing: -.025em;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(2.25rem, 6vw, 4rem);
}

h2 {
  margin-top: 42px;
  font-size: clamp(1.45rem, 3.5vw, 2rem);
}

h3 {
  margin-top: 28px;
}

p, li {
  color: #d4dbe2;
}

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

hr {
  margin: 40px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

ul, ol {
  padding-left: 1.35rem;
}

details {
  margin: 16px 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}

summary {
  cursor: pointer;
  color: var(--text);
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer-inner {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 38px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  font-size: .9rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--text);
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .nav-links {
    gap: 11px 14px;
  }

  main {
    padding-top: 42px;
  }
}