@import url("fonts.css");

:root {
  color-scheme: light;
  --paper: #eaeef4;
  --panel: #ffffff;
  --well: #e5eaf1;
  --line: #d1d8e3;
  --text: #141821;
  --head: #080c14;
  --muted: #5c6675;
  --muted2: #333c4b;
  --acc: #1b52c9;
  --soft: #e4ecfd;
  --red: #c8102e;
  --red-soft: #fbdfe3;
  --steel: #42506b;
  --amber: #c67a12;
  --shadow: 0 1px 2px rgba(16, 28, 56, 0.05), 0 10px 34px rgba(16, 28, 56, 0.1);
  --display: "Zilla Slab", "Rockwell", Georgia, serif;
  --body: "Piazzolla", Georgia, "Iowan Old Style", serif;
  --mono: "Fragment Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --measure-prose: 50rem;
  --measure-wide: 1080px;
  --toc-col: 212px;
  --card-pad-x: 52px;
  --card-pad-top: 44px;
  --card-pad-bottom: 40px;
  --global-nav-height: 56px;
  --section-nav-height: 44px;
  --sticky-navigation-height: calc(var(--global-nav-height) + var(--section-nav-height));
  --sticky-target-offset: calc(var(--sticky-navigation-height) + 0.75rem);
}

:root[data-dark] {
  color-scheme: dark;
  --paper: #0a0d13;
  --panel: #12161f;
  --well: #191e29;
  --line: #28303f;
  --text: #e5e8ef;
  --head: #f4f6fb;
  --muted: #8a93a3;
  --muted2: #c0c6d2;
  --acc: #6f9bff;
  --soft: #16213a;
  --red: #ef4b60;
  --red-soft: #39161c;
  --steel: #8b97ad;
  --amber: #e0a54a;
  --shadow: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  background:
    linear-gradient(90deg, transparent 0 49.9%, color-mix(in srgb, var(--line) 38%, transparent) 50%, transparent 50.1%) 0 0 / 72px 72px,
    var(--paper);
  color: var(--text);
  font-family: var(--body);
  font-optical-sizing: auto;
  font-size: 16px;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--acc);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-thickness: 2.5px;
}

:focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 3px;
}

button,
input,
select {
  font: inherit;
}

button,
.button {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--head);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  padding: 0.65rem 0.9rem;
}

button:hover,
.button:hover {
  border-color: var(--acc);
}

button:disabled {
  cursor: default;
  opacity: 0.45;
}

img,
svg {
  display: block;
  max-width: 100%;
}

.skip-link {
  left: 1rem;
  position: fixed;
  top: -5rem;
  z-index: 100;
}

.skip-link:focus {
  top: 1rem;
}

.site-nav {
  align-items: center;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 0.7rem;
  min-height: var(--global-nav-height);
  overflow-x: auto;
  padding: 0.45rem max(1rem, calc((100vw - var(--measure-wide)) / 2));
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav-brand {
  color: var(--head);
  flex: 0 0 auto;
  font-family: var(--display);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
}

.nav-pages {
  align-items: center;
  display: flex;
  flex: 1 0 auto;
  gap: 0.25rem;
}

.nav-pages a {
  border-radius: 4px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.7rem;
  padding: 0.4rem 0.48rem;
  text-decoration: none;
  white-space: nowrap;
}

.nav-pages a[aria-current="page"] {
  background: var(--soft);
  color: var(--acc);
}

.nav-pages a[data-active-track="true"]:not([aria-current="page"]) {
  color: var(--acc);
}

.theme-toggle {
  flex: 0 0 auto;
  min-height: 44px;
  min-width: 44px;
  padding-inline: 0.65rem;
}

.section-nav {
  align-items: center;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  border-bottom: 1px solid var(--line);
  box-sizing: border-box;
  display: flex;
  gap: 0.7rem;
  min-height: var(--section-nav-height);
  min-width: 0;
  padding: 0.36rem max(1rem, calc((100vw - var(--measure-wide)) / 2));
  position: sticky;
  top: var(--global-nav-height);
  z-index: 19;
}

body:is([data-section="primer"], [data-section="deepseek"], [data-section="pi"]) #main,
body:is([data-section="primer"], [data-section="deepseek"], [data-section="pi"]) main [id] {
  scroll-margin-top: var(--sticky-target-offset);
}

.section-nav-label {
  color: var(--muted2);
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 0.67rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-nav-viewport {
  min-width: 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-color: var(--line) transparent;
  scrollbar-width: thin;
}

.section-nav-list {
  align-items: center;
  display: flex;
  gap: 0.22rem;
  list-style: none;
  margin: 0;
  min-width: max-content;
  padding: 0;
}

.section-nav-list a {
  border-radius: 4px;
  color: var(--muted);
  display: block;
  font-family: var(--mono);
  font-size: 0.7rem;
  padding: 0.38rem 0.48rem;
  text-decoration: none;
  white-space: nowrap;
}

.section-nav-list a[aria-current="page"] {
  background: var(--soft);
  color: var(--acc);
  font-weight: 600;
}

.section-nav-viewport:focus-visible,
.section-nav-list a:focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 2px;
}

.page-shell {
  margin: clamp(1rem, 4vw, 3.4rem) auto;
  max-width: calc(var(--measure-wide) + 2rem);
  padding: 0 1rem;
}

.page-card {
  background: var(--panel);
  border: 1px solid color-mix(in srgb, var(--line) 78%, transparent);
  border-radius: 12px;
  box-shadow: var(--shadow);
  min-width: 0;
  overflow: hidden;
  padding: var(--card-pad-top) var(--card-pad-x) var(--card-pad-bottom);
  position: relative;
}

.page-card:not(.cover-card)::before {
  border-left: 1px dashed var(--line);
  bottom: 2rem;
  content: "";
  left: 22px;
  position: absolute;
  top: 2rem;
}

.cover-card::before {
  background: var(--red);
  bottom: 0;
  content: "";
  left: 0;
  position: absolute;
  top: 0;
  width: 6px;
}

.prose,
.page-header,
.page-footer,
.page-card > section:not(.wide),
.page-card > aside:not(.wide) {
  max-width: var(--measure-prose);
}

.page-header {
  padding-bottom: clamp(2rem, 5vw, 3.4rem);
}

.eyebrow {
  align-items: center;
  color: var(--acc);
  display: flex;
  font-family: var(--mono);
  font-size: 0.7rem;
  gap: 0.65rem;
  letter-spacing: 0.14em;
  margin: 0 0 1rem;
  text-transform: uppercase;
}

.eyebrow::before {
  background: var(--acc);
  content: "";
  height: 2px;
  width: 2.2rem;
}

h1,
h2,
h3,
h4 {
  color: var(--head);
  font-family: var(--display);
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(29px, 7vw, 40px);
  font-weight: 600;
  line-height: 1.06;
  margin: 0;
}

h2 {
  font-size: clamp(20px, 5vw, 25px);
  font-weight: 600;
  line-height: 1.14;
  margin: 0;
}

h3 {
  font-size: 1.18rem;
  font-weight: 600;
  line-height: 1.25;
}

.lede {
  color: var(--muted2);
  font-size: 1.19rem;
  line-height: 1.5;
  margin: 1.25rem 0 0;
  max-width: 44rem;
}

.cover-intro {
  color: var(--muted2);
  font-size: 1.19rem;
  line-height: 1.5;
  margin-top: 1.25rem;
  max-width: 44rem;
}

.cover-intro p {
  font-size: inherit;
  line-height: inherit;
  margin: 0;
}

.cover-intro p + p {
  border-top: 1px solid var(--line);
  margin-top: 1.25rem;
  padding-top: 1.25rem;
}

.byline,
.meta,
.mono {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

.byline {
  margin: 1.4rem 0 0;
}

.section-block {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 1rem;
  padding: clamp(2.2rem, 5vw, 3.5rem) 0;
}

.section-marker {
  color: var(--acc);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  margin: 0;
}

p,
ul,
ol,
blockquote,
dl {
  margin-block: 0.2rem 1rem;
}

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

li {
  padding-left: 0.25rem;
}

li::marker {
  color: var(--acc);
}

code,
kbd {
  background: var(--well);
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.84em;
  padding: 0.1em 0.25em;
}

pre {
  background: var(--well);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.79rem;
  line-height: 1.55;
  margin: 0;
  overflow-x: auto;
  padding: 1rem;
  white-space: pre;
}

pre code {
  background: transparent;
  padding: 0;
}

.wide {
  max-width: none;
}

.scroll-x {
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.callout {
  background: var(--soft);
  border-left: 2px solid var(--acc);
  border-radius: 8px;
  color: var(--text);
  display: grid;
  gap: 0.35rem;
  padding: 1rem 1.1rem;
}

.callout > :last-child {
  margin-bottom: 0;
}

.callout.alert {
  background: var(--red-soft);
  border-color: var(--red);
}

.callout-title {
  color: var(--head);
  font-family: var(--mono);
  font-size: 0.73rem;
  letter-spacing: 0.08em;
  margin: 0;
  text-transform: uppercase;
}

.evidence {
  align-items: center;
  background: var(--well);
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--muted2);
  display: inline-flex;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  line-height: 1;
  padding: 0.34rem 0.42rem;
  text-decoration: none;
  vertical-align: 0.12em;
}

.evidence.source,
.evidence.documented {
  background: var(--soft);
  border-color: color-mix(in srgb, var(--acc) 38%, var(--line));
  color: var(--acc);
}

.evidence.observed {
  border-color: color-mix(in srgb, var(--amber) 50%, var(--line));
  color: var(--amber);
}

.evidence.unknown {
  border-style: dashed;
}

.track-grid,
.card-grid,
.four-owners {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr));
}

.track-card,
.mini-card {
  background: color-mix(in srgb, var(--well) 54%, var(--panel));
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.1rem;
  text-decoration: none;
}

.track-card:hover {
  border-color: var(--acc);
}

.track-card h3,
.mini-card h3,
.track-card p,
.mini-card p {
  margin: 0;
}

.track-card .track-label {
  color: var(--acc);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.track-card .track-time {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  margin-top: auto;
}

.control-ledger {
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
  min-width: 680px;
  width: 100%;
}

.control-ledger th,
.control-ledger td {
  border-bottom: 1px solid var(--line);
  padding: 0.8rem;
  text-align: left;
  vertical-align: top;
}

.control-ledger th {
  background: var(--well);
  color: var(--muted2);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.control-ledger td:first-child {
  color: var(--acc);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.kernel-plane {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  margin: 1.4rem 0;
  max-width: none;
  overflow: hidden;
}

.kernel-plane figcaption {
  align-items: baseline;
  background: var(--well);
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 0.8rem 1.2rem;
  justify-content: space-between;
  padding: 1rem 1.1rem;
}

.kernel-plane figcaption strong {
  color: var(--head);
  font-family: var(--display);
  font-size: 1.15rem;
}

.kernel-plane figcaption span {
  color: var(--muted);
  font-size: 0.86rem;
  margin-left: auto;
  max-width: 42rem;
}

.kernel-plane-layout {
  display: grid;
  gap: 0.7rem;
  grid-template-areas:
    "request core model"
    "durable core action"
    "product core evolution";
  grid-template-columns: minmax(0, 0.9fr) minmax(290px, 1.35fr) minmax(0, 0.9fr);
  padding: 1rem;
}

.kernel-layer,
.kernel-core {
  border: 1px solid var(--line);
  border-radius: 10px;
  min-width: 0;
  padding: 0.9rem;
}

.kernel-layer {
  background: color-mix(in srgb, var(--well) 48%, var(--panel));
}

.kernel-layer.request-shaping { grid-area: request; }
.kernel-layer.model-edge { grid-area: model; }
.kernel-layer.durable-record { border-style: dashed; grid-area: durable; }
.kernel-layer.action-boundary { grid-area: action; }
.kernel-layer.product-coordination { grid-area: product; }
.kernel-layer.evolution-seams { grid-area: evolution; }

.kernel-layer.model-edge {
  background: color-mix(in srgb, var(--amber) 8%, var(--panel));
  border-color: color-mix(in srgb, var(--amber) 58%, var(--line));
}

.kernel-layer.action-boundary {
  background: color-mix(in srgb, var(--steel) 8%, var(--panel));
  border-color: color-mix(in srgb, var(--steel) 56%, var(--line));
}

.kernel-layer-label,
.kernel-role-list,
.kernel-layer > p:last-child,
.kernel-core-title {
  margin: 0;
}

.kernel-layer-label,
.kernel-core-title span,
.control-scales span {
  color: var(--muted2);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.kernel-role-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.32rem;
  margin-block: 0.55rem;
}

.kernel-role-list span {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--head);
  font-family: var(--mono);
  font-size: 0.67rem;
  line-height: 1.25;
  padding: 0.28rem 0.34rem;
}

.kernel-layer > p:last-child {
  color: var(--text);
  font-size: 0.82rem;
  line-height: 1.45;
}

.kernel-core {
  align-content: start;
  background: var(--soft);
  border-color: color-mix(in srgb, var(--acc) 64%, var(--line));
  display: grid;
  grid-area: core;
  padding: 1rem;
}

.kernel-core-title {
  display: grid;
  gap: 0.25rem;
  text-align: center;
}

.kernel-core-title strong {
  color: var(--head);
  font-family: var(--display);
  font-size: 1.12rem;
}

.kernel-path {
  display: grid;
  gap: 1.15rem;
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
}

.kernel-path li {
  background: var(--panel);
  border: 1px solid color-mix(in srgb, var(--acc) 38%, var(--line));
  border-radius: 7px;
  color: var(--head);
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 0.65rem 0.7rem;
  position: relative;
  text-align: center;
}

.kernel-path li:not(:last-child)::after {
  bottom: -1.05rem;
  color: var(--acc);
  content: "↓";
  font-size: 0.92rem;
  left: 50%;
  position: absolute;
  transform: translateX(-50%);
}

.kernel-path li:last-child::after {
  color: var(--acc);
  content: "↺";
  font-size: 1rem;
  margin-left: 0.45rem;
}

.control-scales {
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.control-scales > div {
  display: grid;
  gap: 0.35rem;
  min-width: 0;
  padding: 0.85rem 1rem;
}

.control-scales > div + div {
  border-left: 1px solid var(--line);
}

.control-scales strong {
  color: var(--text);
  font-size: 0.82rem;
  line-height: 1.4;
}

.visually-hidden {
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

.loop-map {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  max-width: none;
  overflow: hidden;
}

.loop-map-head {
  align-items: center;
  background: var(--well);
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  padding: 1rem 1.1rem;
}

.loop-map-head h3,
.loop-map-head p {
  margin: 0;
}

.loop-map-head h3 {
  font-size: 1.15rem;
}

.loop-map-head p {
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.4;
  margin-top: 0.2rem;
}

.loop-map-tabs {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 9px;
  display: flex;
  flex: 0 0 auto;
  gap: 0.2rem;
  padding: 0.2rem;
}

.loop-map-tabs button {
  border: 0;
  min-height: 36px;
  padding: 0.45rem 0.7rem;
}

.loop-map-tabs button[aria-pressed="true"] {
  background: var(--soft);
  box-shadow: inset 0 0 0 1px var(--acc);
  color: var(--acc);
}

.loop-map-canvas {
  align-items: stretch;
  display: grid;
  gap: 0.5rem 0.8rem;
  grid-template-areas:
    "seams shell delegate"
    "seams down1 delegate"
    "state driver environment"
    "state down2 environment"
    "state request environment"
    "state down3 environment"
    "state adapter provider"
    "state down4 provider"
    "state proposal provider"
    "state split split";
  grid-template-columns: minmax(145px, 0.86fr) minmax(270px, 1.55fr) minmax(145px, 0.86fr);
  padding: 1rem;
}

.loop-map-node,
.loop-map-rail {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  min-width: 0;
  padding: 0.7rem 0.75rem;
}

.loop-map-node.control {
  background: var(--soft);
  border-color: color-mix(in srgb, var(--acc) 62%, var(--line));
}

.loop-map-node.model {
  background: color-mix(in srgb, var(--amber) 10%, var(--panel));
  border-color: color-mix(in srgb, var(--amber) 70%, var(--line));
}

.loop-map-node.tool {
  background: color-mix(in srgb, var(--steel) 10%, var(--panel));
  border-color: color-mix(in srgb, var(--steel) 70%, var(--line));
}

.loop-map-rail.state {
  background: color-mix(in srgb, var(--steel) 8%, var(--panel));
  border-color: var(--steel);
  border-style: dashed;
}

.loop-map-kicker,
.loop-map-branch-label {
  color: var(--muted);
  display: block;
  font-family: var(--mono);
  font-size: 0.63rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  line-height: 1.25;
  text-transform: uppercase;
}

.loop-map-main {
  color: var(--head);
  display: block;
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.35;
  margin-top: 0.35rem;
  overflow-wrap: anywhere;
}

.loop-map-detail {
  color: var(--muted2);
  display: block;
  font-size: 0.75rem;
  line-height: 1.4;
  margin-top: 0.3rem;
  overflow-wrap: anywhere;
}

.loop-map-branch-label {
  margin-bottom: 0.4rem;
}

.loop-map-arrow {
  color: var(--muted);
  display: grid;
  font-family: var(--mono);
  font-size: 1.1rem;
  line-height: 1;
  min-height: 1rem;
  place-items: center;
}

.loop-map .shell,
.loop-map .driver,
.loop-map .request,
.loop-map .adapter,
.loop-map .proposal {
  text-align: center;
}

.loop-map .seams { grid-area: seams; }
.loop-map .shell { grid-area: shell; }
.loop-map .delegate { grid-area: delegate; }
.loop-map .state { grid-area: state; }
.loop-map .driver { grid-area: driver; }
.loop-map .environment { grid-area: environment; }
.loop-map .request { grid-area: request; }
.loop-map .adapter { grid-area: adapter; }
.loop-map .provider { align-self: center; grid-area: provider; }
.loop-map .proposal { grid-area: proposal; }
.loop-map .down1 { grid-area: down1; }
.loop-map .down2 { grid-area: down2; }
.loop-map .down3 { grid-area: down3; }
.loop-map .down4 { grid-area: down4; }

.loop-map-split {
  align-items: stretch;
  display: grid;
  gap: 0.5rem;
  grid-area: split;
  grid-template-columns: 1fr 38px 1fr;
}

.loop-map-cycle {
  color: var(--acc);
  display: grid;
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  place-items: center;
}

.loop-map-foot {
  align-items: flex-start;
  border-top: 1px solid var(--line);
  color: var(--muted);
  display: flex;
  font-family: var(--mono);
  font-size: 0.66rem;
  gap: 0.8rem;
  justify-content: space-between;
  line-height: 1.4;
  padding: 0.75rem 1rem;
}

.loop-map-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.loop-map-legend span {
  white-space: nowrap;
}

.loop-map-swatch {
  background: var(--panel);
  border: 1px solid currentColor;
  border-radius: 2px;
  display: inline-block;
  height: 0.55rem;
  margin-right: 0.3rem;
  vertical-align: -0.05rem;
  width: 0.55rem;
}

.loop-map-swatch.control { background: var(--soft); color: var(--acc); }
.loop-map-swatch.model { background: color-mix(in srgb, var(--amber) 10%, var(--panel)); color: var(--amber); }
.loop-map-swatch.tool { background: color-mix(in srgb, var(--steel) 10%, var(--panel)); color: var(--steel); }
.loop-map-swatch.state { border-style: dashed; color: var(--steel); }

.loop-map-fallback {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

.loop-map-fallback[hidden] {
  display: none;
}

.loop-map-fallback article {
  background: color-mix(in srgb, var(--well) 54%, var(--panel));
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem;
}

.loop-map-fallback h3 {
  margin-top: 0;
}

.loop-map-fallback dt {
  color: var(--acc);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  margin-top: 0.8rem;
  text-transform: uppercase;
}

.loop-map-fallback dd {
  margin-left: 0;
}

.sequence,
.context-workbench {
  background: color-mix(in srgb, var(--well) 52%, var(--panel));
  border: 1px solid var(--line);
  border-radius: 10px;
  display: grid;
  gap: 1rem;
  padding: 1rem;
}

.sequence-viewport {
  padding-block: 0.15rem;
}

.sequence-stage {
  min-width: 720px;
  position: relative;
}

.sequence-actors,
.sequence-lifelines,
.sequence-event {
  display: grid;
  gap: 0.65rem;
  grid-template-columns: repeat(var(--actor-count, 4), minmax(126px, 1fr));
}

.sequence-actors {
  position: relative;
  z-index: 2;
}

.sequence-actor {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--actor-color, var(--acc));
  border-radius: 5px;
  color: var(--head);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.55rem;
  text-align: center;
  transition: border-color 180ms ease, box-shadow 180ms ease, opacity 180ms ease;
}

.sequence-actor:not(.is-active) {
  opacity: 0.72;
}

.sequence-actor.is-active {
  border-color: var(--actor-color, var(--acc));
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--actor-color, var(--acc)) 22%, transparent);
}

.sequence-lifelines {
  inset: 2.45rem 0 0;
  pointer-events: none;
  position: absolute;
  z-index: 0;
}

.sequence-lifeline {
  border-left: 1px dashed color-mix(in srgb, var(--actor-color, var(--line)) 52%, var(--line));
  height: 100%;
  justify-self: center;
}

.sequence-events {
  display: grid;
  gap: 0.5rem;
  padding-block: 0.85rem 0.25rem;
  position: relative;
  z-index: 1;
}

.sequence-event {
  align-items: center;
  min-height: 2.8rem;
  transition: opacity 180ms ease;
}

.sequence-event[hidden] {
  display: none;
}

.sequence-event.is-complete {
  opacity: 1;
}

.sequence-event.is-current {
  opacity: 1;
}

.sequence-arrow {
  align-items: center;
  display: grid;
  grid-template-areas: "stack";
  min-width: 0;
}

.sequence-arrow-svg,
.sequence-event-label {
  grid-area: stack;
}

.sequence-arrow-svg {
  height: 1.75rem;
  overflow: visible;
  transition: opacity 180ms ease;
  width: 100%;
}

.sequence-event.is-complete .sequence-arrow-svg {
  opacity: 0.72;
}

.sequence-arrow-svg line {
  stroke: var(--muted);
  stroke-width: 1.2;
  vector-effect: non-scaling-stroke;
}

.sequence-arrow-svg path {
  fill: var(--muted);
}

.sequence-event.is-complete .sequence-arrow-svg line {
  stroke: var(--muted2);
}

.sequence-event.is-complete .sequence-arrow-svg path {
  fill: var(--muted2);
}

.sequence-event.is-current .sequence-arrow-svg line {
  stroke: var(--acc);
  stroke-width: 2.4;
}

.sequence-event.is-current .sequence-arrow-svg path {
  fill: var(--acc);
}

.sequence-event-label,
.sequence-internal {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted2);
  font-family: var(--mono);
  font-size: 0.66rem;
  justify-self: center;
  line-height: 1.25;
  max-width: 12rem;
  padding: 0.28rem 0.48rem;
  text-align: center;
}

.sequence-event.is-current .sequence-event-label,
.sequence-event.is-current .sequence-internal {
  border-color: var(--acc);
  color: var(--head);
  font-weight: 700;
}

.sequence-event.is-complete .sequence-event-label,
.sequence-event.is-complete .sequence-internal {
  border-color: var(--muted);
  color: var(--muted2);
}

.sequence-internal {
  position: relative;
}

.sequence-internal::before {
  background: var(--acc);
  border-radius: 50%;
  content: "";
  height: 0.42rem;
  left: 50%;
  position: absolute;
  top: -0.56rem;
  transform: translateX(-50%);
  transition: opacity 180ms ease;
  width: 0.42rem;
}

.sequence-event.is-complete .sequence-internal::before {
  background: var(--muted2);
  opacity: 0.72;
}

.sequence-event-summary {
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

.sequence-message {
  background: var(--panel);
  border-left: 2px solid var(--acc);
  border-radius: 6px;
  display: grid;
  gap: 0.25rem;
  min-height: 5rem;
  padding: 0.85rem 1rem;
}

.sequence-message strong {
  color: var(--head);
  font-family: var(--display);
}

.sequence-meta {
  align-items: center;
  display: flex;
  gap: 0.55rem;
  justify-content: space-between;
}

.sequence-owner {
  background: var(--soft);
  border-radius: 3px;
  color: var(--acc);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.07em;
  padding: 0.25rem 0.38rem;
  text-transform: uppercase;
}

.sequence-progress {
  background: var(--well);
  border-radius: 999px;
  height: 4px;
  overflow: hidden;
}

.sequence-progress span {
  background: var(--acc);
  display: block;
  height: 100%;
  transition: width 180ms ease;
}

.sequence-wire {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.73rem;
}

.sequence-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.context-controls {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.context-control {
  display: grid;
  gap: 0.35rem;
}

.context-control label,
.context-summary {
  color: var(--muted2);
  font-family: var(--mono);
  font-size: 0.73rem;
}

.context-bar {
  background: var(--well);
  border: 1px solid var(--line);
  border-radius: 6px;
  display: flex;
  min-height: 54px;
  overflow: hidden;
}

.context-segment {
  align-items: center;
  display: flex;
  font-family: var(--mono);
  font-size: 0.65rem;
  justify-content: center;
  min-width: 2px;
  overflow: hidden;
  padding: 0.2rem;
}

.context-segment.instructions { background: var(--soft); color: var(--acc); }
.context-segment.history { background: color-mix(in srgb, var(--steel) 28%, var(--panel)); color: var(--text); }
.context-segment.tools { background: color-mix(in srgb, var(--amber) 28%, var(--panel)); color: var(--text); }
.context-segment.retrieval { background: color-mix(in srgb, var(--acc) 25%, var(--panel)); color: var(--text); }
.context-segment.reference { background: color-mix(in srgb, var(--steel) 18%, var(--panel)); color: var(--muted2); }
.context-segment.summary { background: color-mix(in srgb, var(--acc) 38%, var(--panel)); color: var(--text); }
.context-segment.reserve { background: var(--panel); color: var(--muted); }

.context-ledger {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.context-ledger section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  min-width: 0;
  padding: 0.9rem;
}

.context-ledger h4 {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  margin: 0 0 0.65rem;
  text-transform: uppercase;
}

.context-ledger ul,
.context-record {
  display: grid;
  font-size: 0.85rem;
  gap: 0.6rem;
  margin: 0;
  padding-left: 1.2rem;
}

.context-record {
  border-top: 1px solid var(--line);
  color: var(--muted2);
  font-family: var(--mono);
  font-size: 0.7rem;
  padding-top: 0.8rem;
}

.glossary-popover {
  background: var(--panel);
  border: 1px solid var(--acc);
  border-radius: 8px;
  box-shadow: var(--shadow);
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-top: 0.35rem;
  max-width: min(22rem, calc(100vw - 2rem));
  padding: 0.8rem;
  position: absolute;
  z-index: 30;
}

.term-wrap {
  display: inline;
  position: relative;
}

.toc-rail {
  display: none;
}

.toc-rail h2 {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.69rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.toc-rail ol {
  display: grid;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
}

.toc-rail a {
  border-left: 2px solid var(--line);
  color: var(--muted);
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.35;
  padding-left: 0.6rem;
  text-decoration: none;
}

.toc-rail a[aria-current="location"] {
  border-color: var(--acc);
  color: var(--acc);
}

.chapter-nav {
  border-top: 1px solid var(--line);
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin-top: 2rem;
  padding-top: 1.2rem;
}

.chapter-nav a {
  font-family: var(--mono);
  font-size: 0.75rem;
}

.page-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  margin-top: 2.6rem;
  padding-top: 1rem;
}

.reveal-item {
  opacity: 1;
  transform: none;
}

.js .reveal-item {
  opacity: 0;
  transform: translateY(7px);
}

.js.is-ready .reveal-item {
  opacity: 1;
  transform: none;
  transition: opacity 380ms ease, transform 380ms ease;
  transition-delay: calc(var(--reveal-order, 0) * 70ms);
}

@media (min-width: 1200px) {
  body[data-toc="true"] .page-grid {
    display: grid;
    gap: 28px;
    grid-template-columns: minmax(0, var(--measure-wide)) var(--toc-col);
    justify-content: center;
    margin-inline: auto;
    max-width: calc(var(--measure-wide) + var(--toc-col) + 28px + 2rem);
    padding-inline: 1rem;
  }

  body[data-toc="true"] .page-shell {
    margin-inline: 0;
    padding-inline: 0;
  }

  body[data-toc="true"] .toc-rail {
    align-self: start;
    display: block;
    max-height: calc(100vh - 96px);
    overflow-y: auto;
    position: sticky;
    top: 78px;
  }
}

@media (max-width: 720px) {
  :root {
    --card-pad-x: 22px;
    --card-pad-top: 32px;
    --card-pad-bottom: 30px;
  }

  .page-shell {
    margin-block: 1rem;
    padding-inline: 0.7rem;
  }

  .page-card:not(.cover-card)::before {
    left: 9px;
  }

  .nav-pages a:not([aria-current="page"]) {
    display: none;
  }

  .nav-brand {
    max-width: 11rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .section-nav {
    gap: 0.55rem;
    padding-inline: 0.7rem;
  }

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

  .kernel-plane figcaption {
    align-items: start;
    flex-direction: column;
  }

  .kernel-plane figcaption span {
    margin-left: 0;
  }

  .kernel-plane-layout {
    grid-template-areas: "request" "model" "durable" "core" "action" "product" "evolution";
    grid-template-columns: 1fr;
    padding: 0.75rem;
  }

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

  .control-scales > div + div {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .loop-map-head,
  .loop-map-foot {
    align-items: stretch;
    flex-direction: column;
  }

  .loop-map-tabs {
    width: 100%;
  }

  .loop-map-tabs button {
    flex: 1 1 0;
  }

  .loop-map-canvas {
    grid-template-areas:
      "shell" "down1" "driver" "down2" "request" "down3" "adapter" "provider"
      "down4" "proposal" "split" "state" "seams" "delegate" "environment";
    grid-template-columns: 1fr;
    padding: 0.8rem;
  }

  .loop-map-split {
    grid-template-columns: 1fr;
  }

  .loop-map-cycle {
    min-height: 1.8rem;
    transform: rotate(90deg);
  }
}

@media (max-width: 480px) {
  body {
    background: var(--panel);
  }

  .page-shell {
    margin: 0;
    max-width: none;
    padding: 0;
  }

  .page-card {
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .site-nav {
    padding-inline: 0.7rem;
  }

  .section-nav-label {
    font-size: 0.62rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  :root {
    --paper: #ffffff;
    --panel: #ffffff;
    --text: #000000;
    --head: #000000;
    --muted: #444444;
    --muted2: #222222;
    --line: #bbbbbb;
  }

  body {
    background: #ffffff;
  }

  .site-nav,
  .section-nav,
  .toc-rail,
  .sequence-controls,
  .theme-toggle {
    display: none !important;
  }

  .page-shell {
    margin: 0;
    max-width: none;
    padding: 0;
  }

  .page-card {
    border: 0;
    box-shadow: none;
  }

  .kernel-plane,
  .kernel-layer,
  .kernel-core {
    break-inside: avoid;
  }

  a {
    color: #000000;
  }
}