:root {
  color-scheme: dark;
  --bg: #0d0f14;
  --surface: #151820;
  --surface-alt: #1f2433;
  --ink: #f3f5ff;
  --muted: #aab2c2;
  --line: #2b3144;
  --accent: #5c6cff;
  --accent-strong: #d7dcff;
  --warm: #d28d53;
  --code-bg: #07080d;
  --code-ink: #eef2ff;
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px 22px;
  border-right: 1px solid var(--line);
  background: var(--surface);
  overflow: auto;
}

.brand {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  color: var(--ink);
  text-decoration: none;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 6px;
  background: #ffffff;
  padding: 4px;
}

.brand strong {
  display: block;
  font-size: 1rem;
  line-height: 1.2;
}

.brand span {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
}

.nav {
  margin-top: 30px;
}

.nav h2 {
  margin: 22px 0 8px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.nav a {
  display: block;
  min-width: 0;
  padding: 7px 0;
  color: var(--ink);
  font-size: 0.92rem;
  overflow-wrap: anywhere;
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--accent-strong);
}

.content {
  min-width: 0;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 16px min(5vw, 64px);
  border-bottom: 1px solid var(--line);
  background: rgba(13, 15, 20, 0.94);
  position: sticky;
  top: 0;
  z-index: 2;
}

.topbar a {
  color: var(--ink);
  font-size: 0.9rem;
  text-decoration: none;
}

.page {
  max-width: 1060px;
  padding: 54px min(5vw, 64px) 80px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 32px;
  align-items: center;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--line);
}

.hero h1,
.doc h1 {
  margin: 0 0 16px;
  font-size: clamp(2.1rem, 6vw, 4.8rem);
  line-height: 0.96;
  letter-spacing: 0;
}

.hero p {
  max-width: 680px;
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 1.08rem;
}

.hero-visual {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 22px;
}

.hero-visual img {
  display: block;
  width: min(210px, 70%);
  margin: 0 auto 18px;
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
}

.button.secondary {
  background: transparent;
  color: var(--accent-strong);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0;
}

.tile {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  padding: 18px;
  text-decoration: none;
}

.tile:hover {
  border-color: var(--accent);
}

.tile h2,
.tile h3 {
  margin-top: 0;
  font-size: 1rem;
}

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

.doc {
  max-width: 880px;
}

.doc h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.doc h2 {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 1.55rem;
  letter-spacing: 0;
}

.doc h3 {
  margin-top: 28px;
  font-size: 1.18rem;
}

.doc h4 {
  margin-top: 24px;
  font-size: 1rem;
}

.doc p,
.doc li {
  color: #d8deec;
}

.doc code {
  border-radius: 5px;
  background: #202842;
  padding: 0.12rem 0.32rem;
  color: #eef2ff;
  font-size: 0.92em;
}

.doc pre {
  overflow-x: auto;
  border-radius: var(--radius);
  background: var(--code-bg);
  padding: 18px;
  color: var(--code-ink);
}

.doc pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.metadata {
  color: var(--muted);
  font-size: 0.9rem;
}

.footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 880px) {
  .shell {
    display: block;
  }

  .sidebar {
    position: static;
    width: 100%;
    max-width: 100vw;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 18px;
  }

  .nav h2 {
    grid-column: 1 / -1;
  }

  .topbar {
    position: static;
  }

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

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

@media (max-width: 520px) {
  .nav {
    grid-template-columns: 1fr;
  }
}