:root {
  color-scheme: light;
  --bg: #f7f7f5;
  --paper: #fdfdfb;
  --ink: #0a0a0a;
  --ink-soft: #1a1a1a;
  --muted: #666662;
  --soft: #9a9a94;
  --rule: #d8d8d3;
  --rule-soft: #e8e8e4;
  --accent: #8c1c1c;
  --serif: Fraunces, Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 32px;
}

body {
  margin: 0;
  color: var(--ink-soft);
  background: var(--bg);
  font-family: var(--sans);
  font-size: 15px;
  font-feature-settings: "kern", "liga", "ss01";
  line-height: 1.62;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button { color: inherit; font: inherit; }
section[id] { scroll-margin-top: 32px; }
h1, h2, h3, p { margin-top: 0; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 100;
  padding: 7px 11px;
  color: white;
  background: var(--ink);
  font: 500 12px var(--sans);
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 160ms ease;
}

.skip-link:focus { transform: translateY(0); }

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 56px 32px 96px;
}

.page-shell { width: 100%; }

.toc {
  position: fixed;
  top: 50%;
  left: 32px;
  z-index: 50;
  display: none;
  transform: translateY(-50%);
}

.toc ol {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc a {
  display: flex;
  gap: 10px;
  align-items: center;
  color: var(--soft);
  font: 500 10px var(--mono);
  letter-spacing: .14em;
  text-decoration: none;
  text-transform: uppercase;
  transition: color .2s ease;
}

.toc a::before {
  width: 14px;
  height: 1px;
  background: currentColor;
  content: "";
  transition: width .25s ease, background .25s ease;
}

.toc a:hover, .toc a.active { color: var(--ink); }
.toc a.active::before { width: 28px; background: var(--accent); }

.hero {
  margin: 0 0 72px;
  padding: 0;
}

.hero-copy { text-align: left; }

.eyebrow {
  display: inline-block;
  margin: 0 0 20px;
  padding: 6px 10px 5px;
  color: #fff;
  background: var(--accent);
  font: 600 11px/1.62 var(--sans);
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 18px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 38px;
  font-variation-settings: "SOFT" 100, "opsz" 38;
  font-weight: 500;
  letter-spacing: -.018em;
  line-height: 1.15;
  text-wrap: balance;
}

.authors {
  margin: 0 0 4px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  font-variation-settings: "SOFT" 100, "opsz" 17;
  line-height: 1.5;
}

.authors > span { white-space: nowrap; }
.authors sup { color: var(--accent); font-size: .65em; }
.authors .sep { margin: 0 .55em; color: var(--soft); user-select: none; }

.affiliations {
  margin: 0 0 28px;
  color: var(--muted);
  font-family: var(--serif);
  font-size: 14px;
  font-style: italic;
  font-variation-settings: "SOFT" 100, "opsz" 14;
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
}

.button {
  min-height: 34px;
  padding: 6px 13px 5px 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: transparent;
  box-shadow: 0 1px 2px rgba(10, 10, 10, .04), 0 2px 6px rgba(10, 10, 10, .05);
  color: var(--ink);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .01em;
  line-height: 1.62;
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s ease, background .18s ease;
}

.button svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.button:hover, .button-primary:hover { color: #fff; background: var(--ink); }
.button-primary { color: var(--ink); background: transparent; }

.workflow-wrap, .workflow-shell[hidden] { display: none !important; }

.section {
  margin: 0 0 64px;
  padding: 0;
}

.section-grid, .citation-grid { display: block; }
.section-tinted, .citation-section { background: transparent; }

.section-heading { margin: 0; }
.section-heading.heading-row { margin-bottom: 0; }
.heading-row > div { display: block; }

.section-heading h2 {
  position: relative;
  max-width: none;
  margin: 0 0 24px;
  padding: 0 0 10px;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  font-variation-settings: "SOFT" 100, "opsz" 19;
  font-weight: 500;
  letter-spacing: -.012em;
  line-height: 1.62;
  text-wrap: balance;
}

.section-heading h2 em { color: inherit; font-style: italic; }

h2 .anchor {
  position: absolute;
  top: 0;
  left: -.85em;
  color: var(--accent);
  font-family: var(--serif);
  font-style: normal;
  font-weight: 400;
  line-height: inherit;
  text-decoration: none;
  opacity: .55;
  transition: opacity .18s ease;
}

h2:hover .anchor, h2 .anchor:focus { opacity: 1; }

.section-index { display: none; }
.section-aside, .heading-row > p {
  max-width: none;
  margin: -10px 0 24px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.section-body { min-width: 0; }
.lead {
  margin-bottom: 12px;
  color: var(--ink-soft);
  font: 500 15px/1.72 var(--sans);
}

.intro-copy > p:not(.lead) {
  margin-bottom: 20px;
  color: var(--ink-soft);
  line-height: 1.72;
  text-align: justify;
  text-wrap: pretty;
}

.principle-list {
  margin-top: 28px;
  border-top: 1px solid var(--ink);
}

.principle-list article {
  padding: 15px 0;
  display: grid;
  grid-template-columns: 76px 190px 1fr;
  gap: 18px;
  align-items: baseline;
  border-bottom: 1px solid var(--rule-soft);
}

.principle-list article:last-child { border-bottom-color: var(--ink); }
.principle-list article > span {
  color: var(--accent);
  font: 500 10px var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.principle-list h3, .principle-list p { margin: 0; }
.principle-list h3 { color: var(--ink); font-family: var(--serif); font-size: 14px; font-weight: 500; }
.principle-list p { color: var(--muted); font-size: 13px; line-height: 1.55; }

.paper-figure { margin: 0; }
.paper-figure + .paper-figure { margin-top: 30px; }
.figure-open {
  width: 100%;
  position: relative;
  display: block;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: 0;
  background: var(--paper);
  cursor: zoom-in;
}

.figure-open img { width: 100%; height: auto; }
.figure-open > span {
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 5px 8px;
  color: #fff;
  background: rgba(10, 10, 10, .9);
  font-size: 10px;
  opacity: 0;
  transition: opacity .15s ease;
}

.figure-open:hover > span, .figure-open:focus-visible > span { opacity: 1; }
.paper-figure figcaption {
  margin-top: 16px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
  text-align: justify;
  text-wrap: pretty;
}

.agent-rail {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
}

.agent-rail article {
  min-width: 0;
  padding: 12px;
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 7px 6px;
  align-items: baseline;
  border-right: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--ink);
}

.agent-rail article:last-child { border-right: 0; }
.agent-rail span { color: var(--accent); font: 500 11px var(--mono); letter-spacing: .08em; }
.agent-rail h3 { margin: 0; color: var(--ink); font-family: var(--serif); font-size: 15px; font-weight: 500; }
.agent-rail p { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 12px; line-height: 1.45; }

.mini-label { margin-bottom: 6px; color: var(--accent); font: 500 10px var(--mono); letter-spacing: .12em; text-transform: uppercase; }

.middleware-playground {
  margin-top: 26px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.middleware-lineage {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--rule);
}

.middleware-lineage button {
  position: relative;
  min-width: 0;
  padding: 15px 18px 14px;
  border: 0;
  border-right: 1px solid var(--rule);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  text-align: left;
}

.middleware-lineage button:last-child { border-right: 0; }
.middleware-lineage button::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: transparent;
  content: "";
}

.middleware-lineage button:hover { color: var(--ink); }
.middleware-lineage button[aria-selected="true"] { color: var(--ink); }
.middleware-lineage button[aria-selected="true"]::after { background: var(--accent); }
.middleware-lineage span { display: block; margin-bottom: 3px; font-family: var(--serif); font-size: 15px; font-weight: 500; }
.middleware-lineage code { display: block; overflow: hidden; color: inherit; font: 10px var(--mono); text-overflow: ellipsis; white-space: nowrap; }

.middleware-stage-panel { padding: 22px 0 20px; }
.middleware-meta {
  margin-bottom: 18px;
  display: grid;
  grid-template-columns: minmax(240px, .9fr) minmax(220px, 1.2fr) auto;
  gap: 18px;
  align-items: end;
}

.middleware-meta h3 { margin: 0; overflow-wrap: anywhere; color: var(--ink); font: 500 16px var(--serif); }
.middleware-meta > p:not(.runtime-status) { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.55; }
.runtime-status { margin: 0; color: var(--muted); font: 10px var(--mono); text-align: right; white-space: nowrap; }

.middleware-canvas {
  width: min(100%, 640px);
  position: relative;
  min-height: 320px;
  margin-inline: auto;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--rule);
  background-color: var(--paper);
  background-image: linear-gradient(var(--rule-soft) 1px, transparent 1px), linear-gradient(90deg, var(--rule-soft) 1px, transparent 1px);
  background-size: 24px 24px;
}

.middleware-canvas svg { width: 100%; height: 320px; padding: 14px; }
.middleware-loader { display: flex; gap: 10px; align-items: center; color: var(--muted); font: 11px var(--mono); }
.middleware-loader[hidden] { display: none; }
.middleware-loader > span:first-child:not(:last-child) {
  width: 12px;
  height: 12px;
  border: 1px solid var(--rule);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: middleware-spin .8s linear infinite;
}

.middleware-loader strong { color: var(--ink); font-weight: 500; }

@keyframes middleware-spin { to { transform: rotate(360deg); } }

.middleware-controls {
  padding: 18px 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px 22px;
  border-bottom: 1px solid var(--rule);
}

.middleware-controls label:not(.control-check) { display: grid; gap: 6px; color: var(--muted); font-size: 11px; }
.middleware-controls label[hidden] { display: none; }
.middleware-controls select {
  width: 100%;
  min-height: 34px;
  padding: 5px 28px 5px 9px;
  border: 1px solid var(--rule);
  border-radius: 0;
  color: var(--ink);
  background: var(--paper);
  font: 12px var(--sans);
}

.middleware-controls input[type="range"] { width: 100%; accent-color: var(--accent); }
.middleware-controls output { float: right; color: var(--ink); font: 10px var(--mono); }
.control-check { display: flex; gap: 8px; align-items: center; color: var(--ink-soft); font-size: 12px; cursor: pointer; }
.control-check input { margin: 0; accent-color: var(--accent); }

.middleware-actions {
  padding-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.middleware-actions button, .middleware-code-heading button {
  padding: 6px 11px 5px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  font: 500 11px var(--sans);
}

.middleware-actions button:hover, .middleware-code-heading button:hover { color: #fff; background: var(--ink); }
.middleware-actions button:last-child { margin-left: auto; }

.middleware-code-panel {
  margin-top: 16px;
  border: 1px solid var(--rule);
  background: var(--paper);
}

.middleware-code-panel[hidden] { display: none; }
.middleware-code-heading {
  min-height: 40px;
  padding: 7px 10px 7px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--rule);
  color: var(--muted);
  font: 500 10px var(--mono);
  letter-spacing: .06em;
}

.middleware-code-heading button { padding: 4px 9px; border-color: var(--rule); }
.middleware-code-panel pre { max-height: 420px; margin: 0; padding: 18px; overflow: auto; color: var(--ink); font: 11px/1.65 var(--mono); white-space: pre; }

.middleware-paper-figure { width: min(100%, 720px); margin: 18px auto 0; }
.middleware-paper-figure summary { color: var(--muted); cursor: pointer; font: 11px var(--mono); }
.middleware-paper-figure[open] summary { margin-bottom: 16px; color: var(--ink); }

.citation-box { position: relative; }
.citation-toolbar {
  min-height: 40px;
  padding: 0 0 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font: 500 10px var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.citation-toolbar button {
  padding: 6px 11px 5px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  font: 500 11px var(--sans);
  letter-spacing: 0;
  text-transform: none;
}

.citation-toolbar button:hover { color: #fff; background: var(--ink); }
.citation-box pre {
  margin: 0;
  padding: 22px 24px;
  overflow-x: auto;
  border: 1px solid var(--rule);
  background: var(--paper);
  color: var(--ink);
  font: 12.5px/1.65 var(--mono);
  white-space: pre;
}

.copy-status { min-height: 20px; margin: 0; padding-top: 6px; color: var(--accent); font-size: 11px; }

.site-footer {
  max-width: 880px;
  margin: -28px auto 0;
  padding: 0 32px 52px;
  color: var(--muted);
}

.footer-inner {
  padding-top: 18px;
  display: flex;
  gap: 8px 16px;
  align-items: baseline;
  justify-content: space-between;
  border-top: 1px solid var(--rule);
}

.footer-inner div { display: flex; gap: 8px; }
.footer-inner strong { color: var(--ink); font-family: var(--serif); font-size: 14px; font-weight: 500; }
.footer-inner span, .footer-inner p, .footer-inner a { color: var(--muted); font-size: 11px; }
.footer-inner p { margin: 0; }
.footer-inner a { text-decoration: none; }
.footer-inner a:hover { color: var(--accent); }

.image-dialog {
  width: min(96vw, 1500px);
  max-width: none;
  max-height: 94vh;
  padding: 0;
  border: 1px solid #333;
  border-radius: 0;
  background: #111;
  color: #f5f5f3;
  overscroll-behavior: contain;
}

.image-dialog::backdrop { background: rgba(0, 0, 0, .86); backdrop-filter: blur(4px); }
.dialog-toolbar { min-height: 48px; padding: 8px 10px 8px 16px; display: flex; gap: 24px; align-items: center; justify-content: space-between; border-bottom: 1px solid #333; }
.dialog-toolbar p { margin: 0; color: #c9c9c5; font-size: 12px; }
.dialog-toolbar button { padding: 5px 10px; border: 1px solid #aaa; border-radius: 999px; color: #fff; background: transparent; cursor: pointer; }
.dialog-canvas { max-height: calc(94vh - 49px); overflow: auto; background: var(--paper); }
.dialog-canvas img { width: auto; min-width: 100%; max-width: none; height: auto; }

@media (min-width: 1200px) {
  .toc { display: block; }
}

@media (max-width: 1080px) {
  h2 .anchor { display: none; }
}

@media (max-width: 680px) {
  main { padding: 46px 22px 76px; }
  .hero { margin-bottom: 58px; }
  h1 { margin-bottom: 28px; font-size: 28px; }
  .authors { font-size: 16px; }
  .affiliations { margin-bottom: 24px; }
  .section { margin-bottom: 54px; }
  .principle-list article { grid-template-columns: 62px 1fr; gap: 8px 14px; }
  .principle-list article > span { grid-row: span 2; }
  .principle-list p { grid-column: 2; }
  .agent-rail { grid-template-columns: 1fr; }
  .agent-rail article { padding: 10px 0; grid-template-columns: 42px 1fr; gap: 6px 12px; border-right: 0; border-bottom-color: var(--rule-soft); }
  .agent-rail article:last-child { border-bottom-color: var(--ink); }
  .agent-rail p { grid-column: 2; font-size: 12px; }
  .middleware-lineage button { padding: 13px 9px 12px; }
  .middleware-lineage span { font-size: 13px; }
  .middleware-lineage code { font-size: 8px; }
  .middleware-stage-panel { padding-top: 18px; }
  .middleware-meta { grid-template-columns: 1fr; gap: 8px; align-items: start; }
  .runtime-status { text-align: left; }
  .middleware-canvas { width: 100%; min-height: 250px; }
  .middleware-canvas svg { height: 250px; padding: 8px; }
  .middleware-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px 16px; }
  .middleware-actions button:last-child { margin-left: 0; }
  .middleware-actions button { flex: 1 1 auto; }
  .middleware-code-panel pre { max-height: 340px; padding: 14px; font-size: 10px; }
  .citation-box pre { padding: 18px; font-size: 11px; }
  .site-footer { padding: 0 22px 36px; }
  .footer-inner { display: grid; grid-template-columns: 1fr auto; }
  .footer-inner p { grid-column: 1 / -1; grid-row: 2; }
  .figure-open > span { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

@media print {
  body { background: white; }
  .toc, .hero-actions, .figure-open > span, .site-footer { display: none; }
  main { max-width: none; padding: 0; }
  .hero, .section { margin-bottom: 36px; }
  .paper-figure { break-inside: avoid; }
}