:root {
  --bg: #f7f5f0;
  --surface: #ffffff;
  --surface-2: #efece4;
  --ink: #1c1b18;
  --ink-2: #57544c;
  --line: #dcd7cb;
  --accent: #0e6b5c;
  --accent-ink: #ffffff;
  --logo-bar: #2ba88f;
  --mark: #fde7a6;
  --code-bg: #1e1d1a;
  --code-ink: #ece8dc;
  --code-fm: #9fd3c3;
  --code-mark: rgba(253, 231, 166, 0.22);
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --radius: 10px;
  --max: 1120px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14130f;
    --surface: #1c1b17;
    --surface-2: #24221d;
    --ink: #ece8dc;
    --ink-2: #a8a396;
    --line: #34322b;
    --accent: #5cc2a8;
    --accent-ink: #0b1a16;
    --logo-bar: #0e6b5c;
    --mark: #5a4a17;
    --code-bg: #0e0d0b;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14130f;
  --surface: #1c1b17;
  --surface-2: #24221d;
  --ink: #ece8dc;
  --ink-2: #a8a396;
  --line: #34322b;
  --accent: #5cc2a8;
  --accent-ink: #0b1a16;
  --logo-bar: #0e6b5c;
  --mark: #5a4a17;
  --code-bg: #0e0d0b;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 var(--sans);
}

a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

code, pre { font-family: var(--mono); font-size: 0.88em; }
:not(pre) > code {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.05em 0.35em;
  overflow-wrap: anywhere;
}

pre {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--radius);
  padding: 18px 20px;
  overflow-x: auto;
  line-height: 1.55;
  margin: 0 0 1.4em;
}
pre code { font-size: 14px; }
pre mark { background: var(--code-mark); color: inherit; border-radius: 3px; padding: 0 2px; }
.tok-fm { color: var(--code-fm); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 600; }
.brand__logo { width: 30px; height: 30px; flex: none; }
.brand__box { fill: var(--ink); }
.brand__bar { fill: var(--logo-bar); }
.brand__tree { stroke: var(--accent); }
.brand__dots { fill: var(--accent); }
.site-nav { display: flex; gap: 20px; flex-wrap: wrap; }
.site-nav a { color: var(--ink-2); text-decoration: none; font-size: 15px; font-weight: 500; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); }
.site-nav a[aria-current="page"] { box-shadow: inset 0 -2px 0 var(--accent); }

/* Page shell */
.page { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
.page--toc {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 56px;
  padding-top: 40px;
}
.page__main { min-width: 0; }

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 80px;
  padding: 28px 16px;
  text-align: center;
  color: var(--ink-2);
  font-size: 14px;
}

/* Home */
.hero { padding: 88px 0 56px; max-width: 860px; }
.eyebrow {
  font: 500 13px/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 20px;
}
.hero h1 {
  font-size: clamp(34px, 5.4vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.025em;
  margin: 0 0 24px;
  font-weight: 700;
}
.lede { font-size: 20px; color: var(--ink-2); max-width: 720px; margin: 0 0 32px; }
.hero__actions { display: flex; gap: 12px; flex-wrap: wrap; }
.button {
  display: inline-block;
  padding: 11px 18px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}
.button:hover { border-color: var(--ink-2); }
.button--primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.button--primary:hover { filter: brightness(1.08); border-color: var(--accent); }

.band { padding: 56px 0; border-top: 1px solid var(--line); }
.band h2 { font-size: 28px; letter-spacing: -0.015em; margin: 0 0 14px; }
.band h3 { margin: 0 0 6px; font-size: 18px; }
.section-lede { color: var(--ink-2); margin: 0 0 28px; }
.note { color: var(--ink-2); font-size: 15px; margin-top: 18px; }

.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.checks { list-style: none; padding: 0; margin: 0; }
.checks li { padding-left: 26px; position: relative; margin-bottom: 8px; }
.checks li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

.example {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}
.example pre { margin: 0; min-height: 330px; white-space: pre-wrap; overflow-wrap: anywhere; }
.example__arrow { align-self: center; font-size: 28px; color: var(--ink-2); }
.pane-label {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 13px;
  color: var(--ink-2);
  margin-bottom: 8px;
  min-height: 22px;
}
.pane-label span { font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; font-size: 11px; }
.pane-label code { background: none; border: 0; padding: 0; }
.tabs { display: flex; gap: 4px; margin-bottom: 10px; flex-wrap: wrap; }
.tabs button {
  font: 500 14px var(--sans);
  padding: 6px 12px;
  border-radius: 7px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
}
.tabs button[aria-selected="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }

.tree { margin: 0; }
.tree b { color: var(--code-fm); font-weight: 500; }
.tree i { color: #8c877a; font-style: normal; }

.steps { list-style: none; padding: 0; margin: 20px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.steps li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.steps__n {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
  font: 600 14px var(--mono);
  margin-bottom: 12px;
}
.steps p { margin: 0; color: var(--ink-2); font-size: 15px; }

.harness-grid {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.harness-grid li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.harness-grid code { background: none; border: 0; padding: 0; color: var(--ink-2); font-size: 13px; }

.faq { margin: 20px 0 0; max-width: 780px; }
.faq dt { font-weight: 600; margin-top: 22px; }
.faq dd { margin: 6px 0 0; color: var(--ink-2); }

/* Spec pages */
.toc { position: sticky; top: 84px; align-self: start; max-height: calc(100vh - 100px); overflow-y: auto; font-size: 14px; }
.toc-title { font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; font-size: 11px; color: var(--ink-2); margin: 6px 0 10px; }
.toc ul { list-style: none; padding: 0; margin: 0; border-left: 1px solid var(--line); }
.toc li a { display: block; padding: 4px 0 4px 14px; color: var(--ink-2); text-decoration: none; margin-left: -1px; border-left: 2px solid transparent; }
.toc li a:hover { color: var(--ink); }
.toc li a.is-active { color: var(--ink); border-left-color: var(--accent); }
.toc .toc-l3 a { padding-left: 28px; font-size: 13px; }
.toc code { background: none; border: 0; padding: 0; }

.prose { max-width: 780px; }
.prose h1 { font-size: 40px; letter-spacing: -0.02em; line-height: 1.15; margin: 0 0 12px; }
.prose h2 { font-size: 27px; letter-spacing: -0.012em; margin: 56px 0 14px; padding-top: 18px; border-top: 1px solid var(--line); }
.prose h3 { font-size: 21px; margin: 38px 0 10px; }
.prose h4 { font-size: 17px; margin: 30px 0 8px; }
.prose h2 a.anchor, .prose h3 a.anchor { color: inherit; }
.prose table {
  border-collapse: collapse;
  width: 100%;
  margin: 0 0 1.6em;
  font-size: 15px;
  display: block;
  overflow-x: auto;
}
.prose th, .prose td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { font-weight: 600; background: var(--surface-2); }
.prose td code, .prose th code { white-space: nowrap; }
.prose blockquote { margin: 0 0 1.4em; padding: 4px 18px; border-left: 3px solid var(--accent); color: var(--ink-2); }
.prose li { margin-bottom: 4px; }

@media (max-width: 900px) {
  .page--toc { grid-template-columns: 1fr; gap: 0; padding-top: 24px; }
  .toc { position: static; max-height: none; margin-bottom: 24px; padding: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
  .toc ul { columns: 2; column-gap: 24px; }
  .toc .toc-l3 { display: none; }
  .cols { grid-template-columns: 1fr; gap: 28px; }
  .example { grid-template-columns: minmax(0, 1fr); }
  .example__arrow { transform: rotate(90deg); justify-self: center; }
  .example pre { min-height: 0; }
  .steps { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero { padding: 48px 0 36px; }
  .lede { font-size: 18px; }
  .site-nav { gap: 14px; }
  .brand__name { display: none; }
  .toc ul { columns: 1; }
  .prose h1 { font-size: 32px; }
  pre code { font-size: 13px; }
}