.zg-article {
  --zg-orange: #b84f1b;
  --zg-orange-dark: #86340f;
  --zg-orange-soft: #f2e0d4;
  --zg-green: #176347;
  --zg-green-soft: #dcebe4;
  --zg-blue: #294f73;
  --zg-blue-soft: #dde8ef;
  --zg-graphite: #182722;
  --zg-code: #e8edea;
}

.zg-hero {
  padding-block: clamp(3.5rem, 8vw, 7rem) clamp(3rem, 7vw, 6rem);
}

.zg-hero .breadcrumb {
  margin-bottom: clamp(2rem, 5vw, 4rem);
}

.zg-hero-grid {
  display: grid;
  gap: 2rem;
}

.zg-hero h1 {
  max-width: 11ch;
  margin-top: 0.8rem;
  color: var(--zg-graphite);
  font-size: clamp(3.15rem, 8vw, 6rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
}

.zg-hero-summary {
  display: grid;
  align-content: end;
  gap: 2rem;
}

.zg-deck {
  max-width: 38rem;
  color: var(--ink-soft);
  font-size: clamp(1.2rem, 2.2vw, 1.55rem);
  line-height: 1.48;
}

.zg-hero-meta {
  display: grid;
  border-top: 1px solid var(--line-strong);
}

.zg-hero-meta div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.65rem;
  border-bottom: 1px solid var(--line);
}

.zg-hero-meta dt {
  color: var(--ink-muted);
  font-size: 0.75rem;
}

.zg-hero-meta dd {
  color: var(--zg-graphite);
  font-size: 0.82rem;
  font-weight: 700;
  text-align: right;
}

.zg-system-overview {
  padding-block: clamp(2rem, 6vw, 5rem);
  background: var(--zg-graphite);
  color: #f7f8f4;
}

.zg-overview-heading {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: end;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.zg-overview-heading > div {
  display: grid;
  gap: 0.7rem;
}

.zg-overview-heading h2 {
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.06;
  letter-spacing: -0.025em;
}

.zg-overview-heading p {
  max-width: 46rem;
  color: #c8d1cb;
}

.zg-diagram-hint {
  color: #aebbb4 !important;
  font-size: 0.75rem;
}

.zg-diagram {
  margin-block: 2rem;
}

.zg-diagram svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
  font-family: var(--font-sans);
}

.zg-diagram figcaption {
  max-width: 74ch;
  margin-top: 1rem;
  color: var(--ink-muted);
  font-size: 0.76rem;
  line-height: 1.6;
}

.zg-system-overview .zg-diagram figcaption {
  color: #aebbb4;
}

.zg-lane rect {
  fill: #20302a;
  stroke: #3e5048;
  stroke-width: 1;
}

.zg-lane-label {
  fill: #95a69d;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.zg-node rect,
.zg-sequence-work rect,
.zg-entity rect {
  fill: #ffffff;
  stroke: #9fb0a7;
  stroke-width: 1.25;
}

.zg-node text,
.zg-sequence-work text,
.zg-entity text {
  fill: #182722;
  font-size: 16px;
  font-weight: 700;
}

.zg-node .zg-node-sub,
.zg-sequence-work .zg-node-sub {
  fill: #51635a;
  font-size: 11px;
  font-weight: 500;
}

.zg-node--primary rect {
  fill: #efc4a8;
  stroke: #d06c31;
}

.zg-node--runtime rect {
  fill: #dbe6e0;
  stroke: #749486;
}

.zg-node--authority rect {
  fill: #f2d7c6;
  stroke: #b84f1b;
}

.zg-node--state rect {
  fill: #dce7ec;
  stroke: #64879a;
}

.zg-node--interface rect {
  fill: #f3f5f0;
  stroke: #9fb0a7;
}

.zg-node-link:focus-visible .zg-node rect,
.zg-node-link:hover .zg-node rect {
  stroke: #fff;
  stroke-width: 3;
}

.zg-edge,
.zg-relation {
  fill: none;
  stroke: #87a095;
  stroke-width: 2;
  marker-end: url(#zg-arrow);
}

.zg-edge--dashed {
  stroke-dasharray: 7 6;
}

.zg-note-node rect {
  fill: #293c34;
}

.zg-note-node text {
  fill: #d7dfda;
  font-size: 11px;
}

.zg-diagram-linear {
  display: none;
}

.zg-reading-layout {
  display: grid;
  gap: clamp(2.5rem, 6vw, 6rem);
  padding-block: clamp(4rem, 9vw, 8rem);
}

.zg-toc {
  display: none;
}

.zg-prose {
  min-width: 0;
}

.zg-prose > section {
  display: grid;
  gap: 1.1rem;
  padding-block: clamp(2.7rem, 6vw, 5rem);
  border-top: 1px solid var(--line);
  scroll-margin-top: 6rem;
}

.zg-prose > section:first-child {
  padding-top: 0;
  border-top: 0;
}

.zg-prose h2 {
  max-width: 21ch;
  color: var(--zg-graphite);
  font-size: clamp(2rem, 4.2vw, 3.25rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
}

.zg-prose h3 {
  margin-top: 1.25rem;
  color: var(--zg-graphite);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
}

.zg-prose p,
.zg-prose li,
.zg-prose dd {
  color: var(--ink-soft);
}

.zg-prose p,
.zg-prose ul,
.zg-prose ol:not(.zg-state-flow) {
  max-width: 70ch;
}

.zg-prose strong {
  color: var(--zg-graphite);
}

.zg-prose code,
.zg-code-map code,
.zg-evidence-list code {
  padding: 0.1em 0.33em;
  border-radius: 0.2rem;
  background: var(--zg-code);
  color: var(--zg-graphite);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.88em;
}

.zg-lead {
  color: var(--zg-graphite) !important;
  font-size: clamp(1.18rem, 2vw, 1.4rem);
  line-height: 1.58;
}

.zg-callout {
  display: grid;
  gap: 0.55rem;
  max-width: 70ch;
  margin-top: 1rem;
  padding: 1.15rem 1.25rem;
  border: 1px solid #aabcb3;
  border-radius: 0.35rem;
  background: var(--zg-green-soft);
}

.zg-callout h3 {
  margin: 0;
}

.zg-callout p {
  color: #304b3f;
}

.zg-callout--scope {
  background: var(--zg-blue-soft);
  border-color: #a9bfca;
}

.zg-callout--scope p {
  color: #354e5b;
}

.zg-requirements {
  display: grid;
  margin-block: 1.25rem;
  border-top: 1px solid var(--line-strong);
}

.zg-requirements div {
  display: grid;
  gap: 0.45rem;
  padding-block: 1rem;
  border-bottom: 1px solid var(--line);
}

.zg-requirements dt {
  color: var(--zg-graphite);
  font-weight: 700;
}

.zg-code-map {
  display: grid;
  margin-block: 1.3rem;
  border-block: 1px solid var(--line-strong);
}

.zg-code-map div {
  display: grid;
  grid-template-columns: minmax(7rem, 0.4fr) 1fr;
  gap: 1rem;
  padding-block: 0.75rem;
  border-bottom: 1px solid var(--line);
}

.zg-code-map div:last-child {
  border-bottom: 0;
}

.zg-code-map span {
  color: var(--ink-soft);
}

.zg-authority-ring {
  fill: none;
  stroke: #c8d5cf;
  stroke-width: 34;
}

.zg-diagram--authority .zg-edge,
.zg-diagram--sequence .zg-edge,
.zg-diagram--recovery .zg-edge,
.zg-diagram--data .zg-edge {
  stroke: #718980;
  marker-end: url(#zg-arrow-2);
}

.zg-diagram--authority,
.zg-diagram--sequence,
.zg-diagram--recovery,
.zg-diagram--data {
  width: min(112%, 60rem);
  margin-block: 2rem;
  padding: clamp(1rem, 2vw, 1.5rem);
  border: 1px solid var(--line-strong);
  border-radius: 0.35rem;
  background: #f9faf7;
}

.zg-sequence-actors text {
  fill: #182722;
  font-size: 15px;
  font-weight: 700;
}

.zg-sequence-actors path {
  stroke: #bdc9c3;
  stroke-width: 1;
  stroke-dasharray: 5 7;
}

.zg-sequence-step path {
  fill: none;
  stroke: #6c8579;
  stroke-width: 2;
  marker-end: url(#zg-arrow-3);
}

.zg-sequence-step circle {
  fill: var(--zg-orange);
}

.zg-sequence-step > text:first-of-type {
  fill: #fff;
  font-size: 12px;
  font-weight: 700;
}

.zg-sequence-step > text:last-of-type {
  fill: #35483f;
  font-size: 11px;
  font-weight: 600;
}

.zg-state-flow {
  display: grid;
  max-width: none;
  margin: 1.25rem 0;
  padding: 0;
  list-style: none;
  counter-reset: flow;
}

.zg-state-flow li {
  position: relative;
  display: grid;
  gap: 0.25rem;
  padding: 1rem 0 1rem 3.25rem;
  border-bottom: 1px solid var(--line);
  counter-increment: flow;
}

.zg-state-flow li::before {
  content: counter(flow);
  position: absolute;
  left: 0;
  top: 0.85rem;
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border-radius: 50%;
  background: var(--zg-orange-soft);
  color: var(--zg-orange-dark);
  font-size: 0.75rem;
  font-weight: 700;
}

.zg-state-flow span {
  color: var(--ink-muted);
  font-size: 0.84rem;
}

.zg-decision path {
  fill: #f4e8de;
  stroke: #b87041;
  stroke-width: 1.25;
}

.zg-decision text {
  fill: #51270f;
  font-size: 14px;
  font-weight: 700;
}

.zg-decision .zg-node-sub {
  font-size: 10px;
  font-weight: 500;
}

.zg-diagram--recovery .zg-edge {
  marker-end: url(#zg-arrow-4);
}

.zg-recovery-divider path {
  stroke: #aebdb6;
  stroke-width: 1;
}

.zg-recovery-divider text {
  fill: #687b72;
  font-size: 11px;
  font-weight: 700;
}

.zg-edge--loop {
  stroke-dasharray: 6 5;
}

.zg-failure-table {
  max-width: 100%;
  overflow-x: auto;
  margin-top: 1.5rem;
  border-block: 1px solid var(--line-strong);
}

.zg-failure-table table {
  width: 100%;
  min-width: 42rem;
  border-collapse: collapse;
  text-align: left;
}

.zg-failure-table th,
.zg-failure-table td {
  padding: 0.85rem 0.75rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.zg-failure-table th {
  color: var(--zg-graphite);
  font-size: 0.75rem;
}

.zg-failure-table td {
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.zg-failure-table td:first-child {
  color: var(--zg-graphite);
  font-weight: 700;
}

.zg-relation {
  stroke: #9aaba3;
  stroke-width: 1.5;
  marker-end: none;
}

.zg-entity text {
  font-size: 15px;
}

.zg-entity .zg-entity-field {
  fill: #5c6c64;
  font-size: 10px;
  font-weight: 500;
}

.zg-entity--primary rect {
  fill: var(--zg-orange-soft);
  stroke: var(--zg-orange);
}

.zg-entity--projection rect {
  fill: var(--zg-blue-soft);
  stroke: #6f91a1;
}

.zg-entity--recovery rect {
  fill: var(--zg-green-soft);
  stroke: #6d9985;
}

.zg-principles,
.zg-evidence-list {
  display: grid;
  margin: 1.25rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.zg-principles li,
.zg-evidence-list div {
  display: grid;
  gap: 0.35rem;
  padding-block: 1rem;
  border-bottom: 1px solid var(--line);
}

.zg-principles span,
.zg-evidence-list dd {
  color: var(--ink-soft);
}

.zg-test-layers,
.zg-decisions {
  display: grid;
  gap: 0;
  margin-block: 1.25rem;
  border-top: 1px solid var(--line-strong);
}

.zg-test-layers > div,
.zg-decisions article {
  padding-block: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.zg-test-layers h3,
.zg-decisions h3 {
  margin: 0 0 0.45rem;
}

.zg-status-note {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--surface-raised);
}

.zg-article-end {
  display: grid;
  gap: 2rem;
  align-items: end;
  padding-block: clamp(3rem, 8vw, 6rem);
  border-top: 1px solid var(--line-strong);
}

.zg-article-end > div:first-child {
  display: grid;
  gap: 0.5rem;
}

.zg-article-end > div:first-child > p {
  color: var(--zg-orange-dark);
  font-size: 0.75rem;
  font-weight: 700;
}

.zg-article-end h2 {
  max-width: 20ch;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
}

@media (min-width: 44rem) {
  .zg-hero-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(20rem, 0.8fr);
    align-items: end;
  }

  .zg-requirements,
  .zg-test-layers,
  .zg-decisions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .zg-requirements div:nth-child(odd),
  .zg-test-layers > div:nth-child(odd),
  .zg-decisions article:nth-child(odd) {
    padding-right: 1.5rem;
  }

  .zg-requirements div:nth-child(even),
  .zg-test-layers > div:nth-child(even),
  .zg-decisions article:nth-child(even) {
    padding-left: 1.5rem;
    border-left: 1px solid var(--line);
  }

  .zg-state-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-block: 1px solid var(--line);
  }

  .zg-state-flow li {
    padding: 3.6rem 1rem 1rem 0;
    border-bottom: 0;
  }

  .zg-state-flow li + li {
    padding-left: 1rem;
    border-left: 1px solid var(--line);
  }

  .zg-state-flow li::before {
    left: 0;
  }

  .zg-state-flow li + li::before {
    left: 1rem;
  }

  .zg-principles li,
  .zg-evidence-list div {
    grid-template-columns: minmax(11rem, 0.42fr) 1fr;
    gap: 1.5rem;
  }

  .zg-article-end {
    grid-template-columns: 1fr auto;
  }
}

@media (min-width: 66rem) {
  .zg-reading-layout {
    grid-template-columns: 12rem minmax(0, 48rem);
    justify-content: center;
  }

  .zg-toc {
    position: sticky;
    top: 6.5rem;
    display: block;
    align-self: start;
  }

  .zg-toc > p {
    margin-bottom: 0.8rem;
    color: var(--zg-graphite);
    font-size: 0.75rem;
    font-weight: 700;
  }

  .zg-toc ol {
    display: grid;
    gap: 0.3rem;
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .zg-toc a {
    display: block;
    padding-block: 0.25rem;
    color: var(--ink-muted);
    font-size: 0.74rem;
    line-height: 1.35;
    transition:
      color var(--ease),
      transform var(--ease);
  }

  .zg-toc a:hover,
  .zg-toc a:focus-visible {
    color: var(--zg-orange-dark);
    transform: translateX(0.2rem);
  }
}

@media (max-width: 43.99rem) {
  .zg-hero h1 {
    font-size: clamp(3rem, 17vw, 4.4rem);
  }

  .zg-diagram svg {
    display: none;
  }

  .zg-diagram-linear {
    display: block;
  }

  .zg-diagram-linear ol,
  .zg-diagram-linear dl {
    display: grid;
    gap: 0;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--line-strong);
    list-style: none;
  }

  .zg-diagram-linear li,
  .zg-diagram-linear dl div {
    display: grid;
    gap: 0.35rem;
    padding-block: 0.9rem;
    border-bottom: 1px solid var(--line);
  }

  .zg-diagram-linear strong,
  .zg-diagram-linear dt {
    color: var(--zg-graphite);
    font-weight: 700;
  }

  .zg-diagram-linear span,
  .zg-diagram-linear dd {
    color: var(--ink-soft);
    font-size: 0.88rem;
  }

  .zg-system-overview .zg-diagram-linear ol {
    border-color: #506159;
  }

  .zg-system-overview .zg-diagram-linear li {
    border-color: #3e5048;
  }

  .zg-system-overview .zg-diagram-linear strong {
    color: #fff;
  }

  .zg-system-overview .zg-diagram-linear span {
    color: #b9c6bf;
  }

  .zg-diagram--authority,
  .zg-diagram--sequence,
  .zg-diagram--recovery,
  .zg-diagram--data {
    width: 100%;
    padding: 1rem;
  }

  .zg-code-map div {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  .zg-failure-table {
    overflow: visible;
    border-block: 0;
  }

  .zg-failure-table table,
  .zg-failure-table thead,
  .zg-failure-table tbody,
  .zg-failure-table tr,
  .zg-failure-table th,
  .zg-failure-table td {
    display: block;
    min-width: 0;
  }

  .zg-failure-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }

  .zg-failure-table tr {
    padding-block: 1rem;
    border-top: 1px solid var(--line-strong);
  }

  .zg-failure-table td {
    padding: 0.22rem 0;
    border: 0;
  }

  .zg-failure-table td:nth-child(2)::before {
    content: "Risk: ";
    color: var(--ink-muted);
    font-weight: 700;
  }

  .zg-failure-table td:nth-child(3)::before {
    content: "Response: ";
    color: var(--ink-muted);
    font-weight: 700;
  }
}

@media (prefers-reduced-motion: reduce) {
  .zg-toc a {
    transition: none;
  }
}

@media print {
  .site-header,
  .site-footer,
  .zg-toc,
  .zg-article-end {
    display: none;
  }

  .zg-system-overview {
    background: #fff;
    color: #000;
  }

  .zg-system-overview .zg-overview-heading p,
  .zg-system-overview .zg-diagram figcaption {
    color: #333;
  }

  .zg-reading-layout {
    display: block;
    padding: 2rem 0;
  }
}