:root {
  color-scheme: light;
  --ink: #17202a;
  --muted: #5f6c7b;
  --line: #d9e1ea;
  --panel: #f7f9fb;
  --paper: #ffffff;
  --accent: #1f6feb;
  --accent-dark: #174ea6;
  --code-bg: #101820;
  --code-ink: #edf4ff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

.site-header {
  background: #eef4fb;
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  gap: 1rem;
  align-items: center;
  max-width: 1180px;
  min-height: 56px;
  margin: 0 auto;
  padding: 0 1.25rem;
  overflow-x: auto;
  white-space: nowrap;
}

.nav a,
.toc a {
  color: var(--accent-dark);
  text-decoration: none;
}

.nav a:hover,
.toc a:hover {
  text-decoration: underline;
}

.hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: 4.5rem 1.25rem 5rem;
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--accent-dark);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(2.4rem, 5vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: 0;
}

.lede {
  max-width: 760px;
  margin: 1.35rem 0 0;
  color: var(--muted);
  font-size: 1.18rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 820px);
  gap: 3rem;
  max-width: 1180px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 5rem;
}

.toc {
  position: sticky;
  top: 1rem;
  align-self: start;
  max-height: calc(100vh - 2rem);
  padding: 1rem 0;
  overflow: auto;
  border-right: 1px solid var(--line);
}

.toc h2 {
  margin: 0 1.5rem 0.75rem 0;
  font-size: 0.82rem;
  letter-spacing: 0;
  text-transform: uppercase;
}

.toc a {
  display: block;
  margin-right: 1.5rem;
  padding: 0.32rem 0;
  color: #334155;
  font-size: 0.94rem;
}

.toc .toc-level-2 {
  padding-left: 0.9rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.content {
  min-width: 0;
}

.content h1,
.content h2,
.content h3 {
  letter-spacing: 0;
  line-height: 1.16;
}

.content h1 {
  margin: 3rem 0 1rem;
  font-size: 2rem;
}

.content h2 {
  margin: 2rem 0 0.7rem;
  font-size: 1.45rem;
}

.content h3 {
  margin: 1.35rem 0 0.5rem;
  font-size: 1.12rem;
}

.content p,
.content li {
  font-size: 1rem;
}

.content ul,
.content ol {
  padding-left: 1.4rem;
}

.content li + li {
  margin-top: 0.2rem;
}

.content hr {
  height: 1px;
  margin: 2.25rem 0;
  border: 0;
  background: var(--line);
}

.content code {
  padding: 0.1rem 0.28rem;
  border-radius: 4px;
  background: #edf2f7;
  color: #102033;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.content pre {
  margin: 1rem 0 1.25rem;
  padding: 1rem;
  overflow-x: auto;
  border-radius: 8px;
  background: var(--code-bg);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
}

.content pre code {
  display: block;
  min-width: max-content;
  padding: 0;
  background: transparent;
  color: var(--code-ink);
  font-size: 0.92rem;
  line-height: 1.55;
}

@media (max-width: 820px) {
  .layout {
    display: block;
    padding-top: 1.5rem;
  }

  .hero {
    padding: 3.25rem 1rem 3.75rem;
  }

  .nav {
    padding: 0 1rem;
  }

  .toc {
    position: static;
    max-height: none;
    margin-bottom: 1.5rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .toc a {
    margin-right: 0;
  }
}