:root {
    --bg: #05060a; --bg-soft: #0b0e16; --panel: rgba(255,255,255,.04); --border: rgba(255,255,255,.08);
    --text: #eef2ff; --muted: #9aa3b8; --accent: #00e5a8; --accent-2: #7c5cff;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; scroll-padding-top: 80px; }
  body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: radial-gradient(1200px 600px at 80% -10%, rgba(124,92,255,.12), transparent 60%), var(--bg);
    color: var(--text); line-height: 1.7; font-size: 16px;
  }
  a { color: var(--accent); text-decoration: none; }
  a:hover { text-decoration: underline; }

  header {
    position: sticky; top: 0; z-index: 10; backdrop-filter: blur(14px);
    background: rgba(5,6,10,.8); border-bottom: 1px solid var(--border);
  }
  .bar { width: min(1180px, calc(100% - 32px)); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 14px 0; gap: 12px; }
  .logo { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); }
  .logo:hover { text-decoration: none; }
  .logo-mark { width: 22px; height: 22px; border-radius: 7px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
  .nav { display: flex; gap: 18px; font-size: .92rem; }
  .nav a { color: var(--muted); }
  .nav a:hover { color: var(--text); text-decoration: none; }

  .layout { width: min(1180px, calc(100% - 32px)); margin: 0 auto; display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 48px; padding: 40px 0 80px; }
  @media (max-width: 960px) { .layout { grid-template-columns: 1fr; gap: 0; padding-top: 24px; } }

  nav.toc { position: sticky; top: 90px; align-self: start; max-height: calc(100vh - 110px); overflow-y: auto; font-size: .88rem; }
  nav.toc .label { color: var(--muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 10px; }
  nav.toc a { display: block; color: var(--muted); padding: 4px 0 4px 12px; border-left: 2px solid var(--border); line-height: 1.4; }
  nav.toc a.l3 { padding-left: 24px; font-size: .84rem; }
  nav.toc a:hover { color: var(--text); text-decoration: none; }
  nav.toc a.active { color: var(--accent); border-left-color: var(--accent); }
  details.toc-mobile { display: none; }
  @media (max-width: 960px) {
    nav.toc { display: none; }
    details.toc-mobile { display: block; border: 1px solid var(--border); border-radius: 12px; padding: 12px 16px; margin-bottom: 28px; background: var(--panel); }
    details.toc-mobile summary { cursor: pointer; color: var(--muted); }
    details.toc-mobile a { display: block; padding: 4px 0; color: var(--muted); }
    details.toc-mobile a.l3 { padding-left: 14px; }
  }

  article { max-width: 780px; min-width: 0; }
  .eyebrow { color: var(--accent); font-size: .8rem; font-weight: 600; text-transform: uppercase; letter-spacing: .1em; }
  h1 { font-size: clamp(2rem, 4vw, 2.6rem); line-height: 1.15; letter-spacing: -.02em; margin: 8px 0 28px; }
  h2 { font-size: 1.55rem; letter-spacing: -.01em; margin: 56px 0 16px; padding-top: 8px; border-top: 1px solid var(--border); padding-top: 32px; }
  h3 { font-size: 1.15rem; margin: 36px 0 12px; }
  h2, h3 { position: relative; }
  .anchor { position: absolute; left: -1.1em; color: var(--muted); opacity: 0; font-weight: 400; }
  h2:hover .anchor, h3:hover .anchor { opacity: 1; text-decoration: none; }
  p, ul, ol, .table-wrap, pre { margin-bottom: 18px; }
  ul, ol { padding-left: 1.4em; }
  li { margin-bottom: 6px; }
  li::marker { color: var(--muted); }
  strong { color: #fff; }
  hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }

  code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .86em; }
  :not(pre) > code { background: rgba(255,255,255,.07); border: 1px solid var(--border); padding: 1px 6px; border-radius: 6px; color: #d7e0ff; }
  pre { position: relative; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; overflow-x: auto; line-height: 1.55; }
  pre code { font-size: .84rem; color: #d7e0ff; }
  .copy {
    position: absolute; top: 8px; right: 8px; font: inherit; font-size: .75rem; color: var(--muted);
    background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 3px 9px; cursor: pointer; opacity: 0; transition: opacity .15s;
  }
  pre:hover .copy, .copy:focus { opacity: 1; }
  .copy.done { color: var(--accent); opacity: 1; }

  .table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 12px; }
  table { width: 100%; border-collapse: collapse; font-size: .92rem; }
  th, td { text-align: left; padding: 10px 14px; vertical-align: top; }
  th { background: var(--panel); color: var(--muted); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .05em; }
  td { border-top: 1px solid var(--border); }

  /* Room after the last section so every heading can scroll to the top (keeps the sidebar highlight right). */
  article::after { content: ""; display: block; height: 45vh; }
  footer { color: var(--muted); font-size: .85rem; margin-top: 64px; padding-top: 20px; border-top: 1px solid var(--border); }