.project-space--ai-core {
  width: min(calc(100% - (2 * var(--page-gutter))), var(--page-width));
  margin: 0 auto;
}

.ai-core-projection {
  --ai-core-rule: rgba(48, 54, 62, 0.16);
  --ai-core-rule-strong: rgba(48, 54, 62, 0.28);
  --ai-core-accent: #285a61;
  --ai-core-accent-soft: rgba(40, 90, 97, 0.1);
  --ai-core-success: #365f4c;
  --ai-core-failure: #803d39;
  --ai-core-warning: #735d38;
  --platform-border: var(--ai-core-rule);
  --platform-accent: var(--ai-core-accent);
  --platform-text-tertiary: var(--platform-text-muted);
  --platform-surface-strong: rgba(247, 246, 244, 0.72);
  --platform-background: var(--platform-canvas);
  --platform-font-display: var(--font-display-platform);
  --platform-font-mono: ui-monospace, "SFMono-Regular", Consolas, monospace;
  width: min(1120px, 100%);
  margin: 48px auto 120px;
  color: var(--platform-text-primary);
}

.ai-core-projection *,
.ai-core-projection *::before,
.ai-core-projection *::after {
  box-sizing: border-box;
}

.ai-core-projection-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 56px;
  align-items: end;
  padding: 64px 8px 52px;
  border-bottom: 1px solid var(--ai-core-rule);
}

.ai-core-projection-intro {
  min-width: 0;
}

.ai-core-projection-intro > p:first-child,
.ai-core-current-callout > span {
  margin: 0;
  color: var(--platform-text-muted);
  font-size: var(--caption-size);
  font-weight: 650;
  text-transform: uppercase;
}

.ai-core-projection-intro h1 {
  margin: 16px 0 0;
  font-family: var(--font-display-platform);
  font-size: 4rem;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 0.98;
}

.ai-core-projection-lede {
  max-width: 54ch;
  margin: 28px 0 0;
  color: var(--platform-text-secondary);
  font-size: var(--body-large-size);
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.ai-core-current-callout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px 20px;
  min-width: 0;
  padding: 26px 28px;
  border: 1px solid rgba(255, 255, 255, 0.74);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.46), rgba(236, 234, 230, 0.22)),
    rgba(247, 246, 244, 0.28);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.88),
    0 22px 60px rgba(54, 50, 48, 0.1);
  backdrop-filter: blur(24px) saturate(118%);
  -webkit-backdrop-filter: blur(24px) saturate(118%);
}

.ai-core-current-callout > span {
  grid-column: 1 / -1;
}

.ai-core-current-callout > strong {
  min-width: 0;
  font-family: var(--font-display-platform);
  font-size: 1.85rem;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1.15;
  overflow-wrap: anywhere;
}

.ai-core-current-callout > .ai-core-status {
  align-self: start;
}

.ai-core-current-callout > div {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  padding-top: 16px;
  border-top: 1px solid var(--ai-core-rule);
  color: var(--platform-text-secondary);
  font-size: var(--caption-size);
}

.ai-core-current-callout small {
  color: var(--platform-text-muted);
}

.ai-core-section {
  display: grid;
  grid-template-columns: minmax(190px, 0.34fr) minmax(0, 1fr);
  gap: 48px;
  padding: 52px 8px;
  border-bottom: 1px solid var(--ai-core-rule);
}

.ai-core-section > h2 {
  position: sticky;
  top: 150px;
  align-self: start;
  margin: 0;
  color: var(--platform-text-secondary);
  font-family: var(--font-latin);
  font-size: 0.88rem;
  font-weight: 650;
  letter-spacing: 0;
  line-height: 1.45;
  text-transform: uppercase;
  scroll-margin-top: 160px;
}

.ai-core-section-body {
  min-width: 0;
  overflow-wrap: anywhere;
}

.ai-core-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  width: max-content;
  max-width: 100%;
  min-height: 26px;
  padding: 4px 9px;
  border: 1px solid rgba(63, 70, 78, 0.18);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.2);
  color: var(--platform-text-secondary);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.2;
  text-transform: uppercase;
}

.ai-core-status i {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: currentColor;
}

.ai-core-status--pass,
.ai-core-status--frozen,
.ai-core-status--released {
  border-color: rgba(54, 95, 76, 0.28);
  color: var(--ai-core-success);
}

.ai-core-status--fail,
.ai-core-status--blocked {
  border-color: rgba(128, 61, 57, 0.25);
  color: var(--ai-core-failure);
}

.ai-core-status--in-progress,
.ai-core-status--inconclusive {
  border-color: rgba(129, 98, 52, 0.28);
  color: var(--ai-core-warning);
}

.ai-core-status--published {
  border-color: rgba(40, 90, 97, 0.26);
  color: var(--ai-core-accent);
}

.ai-core-status--not-frozen,
.ai-core-status--reopened {
  border-color: rgba(40, 90, 97, 0.26);
  color: var(--ai-core-accent);
}

.ai-core-status--historical,
.ai-core-status--superseded,
.ai-core-status--unknown {
  color: #59616b;
}

.ai-core-current-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid var(--ai-core-rule-strong);
}

.ai-core-current-grid > div {
  min-width: 0;
  min-height: 132px;
  padding: 22px 20px 24px 0;
  border-bottom: 1px solid var(--ai-core-rule);
}

.ai-core-current-grid > div:not(:nth-child(3n + 1)) {
  padding-left: 20px;
  border-left: 1px solid var(--ai-core-rule);
}

.ai-core-current-grid > .ai-core-current-last-updated {
  grid-column: 1 / -1;
  min-height: 0;
}

.ai-core-current-grid dt,
.ai-core-event-notes dt,
.ai-core-report-notes dt {
  color: var(--platform-text-muted);
  font-size: var(--caption-size);
  line-height: 1.45;
}

.ai-core-current-grid dd {
  display: grid;
  gap: 7px;
  margin: 22px 0 0;
  color: var(--platform-text-primary);
  font-size: 1rem;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.ai-core-current-grid dd small {
  color: var(--platform-text-secondary);
  font-size: var(--caption-size);
}

.ai-core-timeline-head {
  display: grid;
  gap: 24px;
  margin-bottom: 36px;
}

.ai-core-timeline-head > p {
  max-width: 62ch;
  margin: 0;
  color: var(--platform-text-secondary);
  font-size: var(--body-large-size);
  line-height: 1.65;
}

.ai-core-version-filters {
  display: flex;
  flex-wrap: wrap;
  width: fit-content;
  max-width: 100%;
  border: 1px solid var(--ai-core-rule-strong);
  border-radius: 7px;
  overflow: hidden;
}

.ai-core-version-filters button {
  min-height: 38px;
  padding: 8px 13px;
  border: 0;
  border-right: 1px solid var(--ai-core-rule);
  background: rgba(255, 255, 255, 0.18);
  color: var(--platform-text-secondary);
  font: inherit;
  font-size: var(--caption-size);
  cursor: pointer;
}

.ai-core-version-filters button:last-child {
  border-right: 0;
}

.ai-core-version-filters button[aria-pressed="true"] {
  background: var(--ai-core-accent);
  color: #fff;
}

.ai-core-version-filters button:focus-visible,
.ai-core-detail-link:focus-visible,
.ai-core-report-list article:focus-visible {
  outline: 2px solid var(--ai-core-accent);
  outline-offset: 3px;
}

.ai-core-timeline {
  position: relative;
}

.ai-core-timeline::before {
  position: absolute;
  top: 7px;
  bottom: 7px;
  left: 5px;
  width: 1px;
  background: var(--ai-core-rule-strong);
  content: "";
}

.ai-core-timeline-entry {
  position: relative;
  display: grid;
  grid-template-columns: 156px minmax(0, 1fr);
  gap: 30px;
  min-width: 0;
  padding: 0 0 52px 30px;
}

.ai-core-timeline-entry:last-child {
  padding-bottom: 0;
}

.ai-core-timeline-entry[hidden] {
  display: none;
}

.ai-core-timeline-marker {
  position: absolute;
  top: 5px;
  left: 0;
  width: 11px;
  height: 11px;
  border: 2px solid rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  background: var(--ai-core-accent);
  box-shadow: 0 0 0 1px rgba(40, 90, 97, 0.34);
}

.ai-core-timeline-meta {
  display: grid;
  gap: 9px;
  align-content: start;
  color: var(--platform-text-secondary);
  font-size: var(--caption-size);
}

.ai-core-timeline-meta > span:not(.ai-core-status) {
  color: var(--ai-core-accent);
  font-weight: 700;
  text-transform: uppercase;
}

.ai-core-timeline-content {
  min-width: 0;
}

.ai-core-timeline-content > p,
.ai-core-stage-list article > div:last-child > p,
.ai-core-report-list article > p {
  margin: 0 0 10px;
  color: var(--platform-text-muted);
  font-size: var(--caption-size);
}

.ai-core-timeline-content h3,
.ai-core-stage-list h3,
.ai-core-architecture-list h3,
.ai-core-research-list h3,
.ai-core-report-list h3 {
  margin: 0;
  font-family: var(--font-display-platform);
  font-size: 1.65rem;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1.2;
  text-wrap: balance;
  overflow-wrap: anywhere;
}

.ai-core-event-summary,
.ai-core-report-summary,
.ai-core-research-list article > p,
.ai-core-stage-list article > div:last-child > span {
  display: block;
  margin-top: 16px;
  color: var(--platform-text-secondary);
  line-height: 1.7;
}

.ai-core-event-notes,
.ai-core-report-notes {
  display: grid;
  gap: 0;
  margin: 22px 0 0;
  border-top: 1px solid var(--ai-core-rule);
}

.ai-core-event-notes > div,
.ai-core-report-notes > div {
  display: grid;
  grid-template-columns: 138px minmax(0, 1fr);
  gap: 20px;
  padding: 15px 0;
  border-bottom: 1px solid var(--ai-core-rule);
}

.ai-core-event-notes dd,
.ai-core-report-notes dd {
  margin: 0;
  color: var(--platform-text-secondary);
  line-height: 1.6;
  overflow-wrap: anywhere;
}

.ai-core-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 24px 0 0;
  border-block: 1px solid var(--ai-core-rule-strong);
}

.ai-core-metrics > div {
  min-width: 0;
  padding: 18px 16px 19px 0;
}

.ai-core-metrics > div + div {
  padding-left: 16px;
  border-left: 1px solid var(--ai-core-rule);
}

.ai-core-metrics dt {
  color: var(--platform-text-muted);
  font-size: var(--caption-size);
}

.ai-core-metrics dd {
  margin: 12px 0 0;
  color: var(--platform-text-primary);
  font-family: var(--font-latin);
  font-size: 1.55rem;
  font-variant-numeric: tabular-nums;
  font-weight: 550;
  line-height: 1.15;
  overflow-wrap: anywhere;
}

.ai-core-metrics dd small {
  color: var(--platform-text-muted);
  font-size: var(--caption-size);
  font-weight: 500;
}

.ai-core-public-commit {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 18px;
  margin-top: 24px;
  padding: 18px 20px;
  border: 1px solid var(--ai-core-rule);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.2);
}

.ai-core-public-commit > span,
.ai-core-public-commit > time {
  color: var(--platform-text-muted);
  font-size: var(--caption-size);
}

.ai-core-public-commit code {
  min-width: 0;
  color: var(--ai-core-accent);
  font-family: var(--font-mono, monospace);
  font-size: 0.92rem;
  overflow-wrap: anywhere;
}

.ai-core-public-commit > time {
  grid-column: 2;
}

.ai-core-public-commit > p,
.ai-core-public-commit > small {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  color: var(--platform-text-secondary);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.ai-core-detail-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  margin-top: 18px;
  color: var(--ai-core-accent);
  font-size: var(--caption-size);
  font-weight: 700;
  text-decoration: none;
}

.ai-core-filter-result {
  margin: 24px 0 0;
  color: var(--platform-text-muted);
  font-size: var(--caption-size);
}

.ai-core-empty {
  margin: 0;
  padding: 28px 0;
  border-block: 1px solid var(--ai-core-rule);
  color: var(--platform-text-muted);
  line-height: 1.6;
}

.ai-core-stage-list,
.ai-core-architecture-list,
.ai-core-research-list,
.ai-core-report-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ai-core-rule-strong);
}

.ai-core-stage-list article {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 28px;
  padding: 26px 0;
  border-bottom: 1px solid var(--ai-core-rule);
}

.ai-core-stage-list article > div:first-child {
  display: grid;
  gap: 12px;
  align-content: start;
  color: var(--platform-text-secondary);
  font-size: var(--caption-size);
}

.ai-core-architecture-list article,
.ai-core-research-list article,
.ai-core-report-list article {
  min-width: 0;
  padding: 28px 0 34px;
  border-bottom: 1px solid var(--ai-core-rule);
  scroll-margin-top: 150px;
}

.ai-core-architecture-list header,
.ai-core-research-list header,
.ai-core-report-list header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 20px;
}

.ai-core-architecture-list header time,
.ai-core-research-list header > div,
.ai-core-report-list header > div {
  color: var(--platform-text-muted);
  font-size: var(--caption-size);
}

.ai-core-research-list header > div,
.ai-core-report-list header > div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.ai-core-research-list header span,
.ai-core-report-list header span {
  color: var(--ai-core-accent);
  font-weight: 700;
  text-transform: uppercase;
}

.ai-core-architecture-list h3,
.ai-core-research-list h3,
.ai-core-report-list h3 {
  margin-top: 18px;
}

.ai-core-architecture-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 30px minmax(0, 1fr) 30px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  margin-top: 26px;
}

.ai-core-architecture-flow > div {
  display: grid;
  gap: 13px;
  align-content: start;
  min-width: 0;
  min-height: 116px;
  padding: 18px;
  border: 1px solid var(--ai-core-rule);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.16);
}

.ai-core-architecture-flow > div > span {
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.ai-core-architecture-flow > div > small {
  color: var(--platform-text-muted);
  font-size: var(--caption-size);
}

.ai-core-architecture-flow > b {
  color: var(--ai-core-accent);
  font-size: 1.2rem;
  font-weight: 400;
  text-align: center;
}

.ai-core-boundary {
  display: grid;
  gap: 13px;
}

.ai-core-boundary-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--ai-core-rule-strong);
}

.ai-core-boundary-flow strong {
  min-width: 0;
  color: var(--platform-text-primary);
  font-size: 0.9rem;
  font-weight: 650;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.ai-core-boundary-flow span {
  color: var(--ai-core-accent);
}

.ai-core-boundary > p {
  max-width: 66ch;
  margin: 0;
  color: var(--platform-text-secondary);
  line-height: 1.65;
}

.ai-core-boundary > p:first-of-type {
  margin-top: 12px;
  color: var(--platform-text-primary);
  font-weight: 650;
}

@media (hover: hover) {
  .ai-core-version-filters button:hover:not([aria-pressed="true"]) {
    background: var(--ai-core-accent-soft);
    color: var(--ai-core-accent);
  }

  .ai-core-detail-link:hover {
    color: var(--platform-text-primary);
  }
}

@media (max-width: 900px) {
  .ai-core-current-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ai-core-current-grid > div:not(:nth-child(3n + 1)) {
    padding-left: 0;
    border-left: 0;
  }

  .ai-core-current-grid > div:nth-child(even) {
    padding-left: 20px;
    border-left: 1px solid var(--ai-core-rule);
  }

  .ai-core-architecture-flow {
    grid-template-columns: 1fr;
  }

  .ai-core-architecture-flow > b {
    transform: rotate(90deg);
  }
}

@media (max-width: 720px) {
  .ai-core-projection {
    margin-top: 16px;
    margin-bottom: 80px;
  }

  .ai-core-projection-hero {
    grid-template-columns: 1fr;
    gap: 36px;
    padding: 44px 2px 40px;
  }

  .ai-core-projection-intro h1 {
    font-size: 3rem;
  }

  .ai-core-current-callout {
    padding: 22px;
  }

  .ai-core-section {
    grid-template-columns: 1fr;
    gap: 22px;
    padding: 40px 2px;
  }

  .ai-core-section > h2 {
    position: static;
  }

  .ai-core-timeline-entry,
  .ai-core-stage-list article {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .ai-core-event-notes > div,
  .ai-core-report-notes > div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .ai-core-metrics {
    grid-template-columns: 1fr;
  }

  .ai-core-metrics > div + div {
    padding-left: 0;
    border-top: 1px solid var(--ai-core-rule);
    border-left: 0;
  }

  .ai-core-boundary-flow {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .ai-core-boundary-flow span {
    transform: rotate(90deg);
  }
}

@media (max-width: 460px) {
  .ai-core-current-callout {
    grid-template-columns: 1fr;
  }

  .ai-core-current-callout > span,
  .ai-core-current-callout > div {
    grid-column: 1;
  }

  .ai-core-current-grid {
    grid-template-columns: 1fr;
  }

  .ai-core-current-grid > div,
  .ai-core-current-grid > div:nth-child(even) {
    min-height: 0;
    padding: 20px 0;
    border-left: 0;
  }

  .ai-core-version-filters {
    width: 100%;
  }

  .ai-core-version-filters button {
    flex: 1 1 50%;
    border-bottom: 1px solid var(--ai-core-rule);
  }

  .ai-core-timeline-entry {
    padding-left: 24px;
  }

  .ai-core-public-commit {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .ai-core-public-commit > time,
  .ai-core-public-commit > p,
  .ai-core-public-commit > small {
    grid-column: 1;
  }

  .ai-core-architecture-list header,
  .ai-core-research-list header,
  .ai-core-report-list header {
    align-items: start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  .project-space--ai-core *,
  .project-space--ai-core *::before,
  .project-space--ai-core *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

/* Historical explorer: a compact public archive, not a second dashboard. */
.ai-core-history {
  display: grid;
  gap: clamp(1rem, 2vw, 1.6rem);
  min-width: 0;
}

.ai-core-history [hidden] {
  display: none !important;
}

.ai-core-history-intro {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid color-mix(in srgb, var(--platform-border) 76%, transparent);
}

.ai-core-history-intro p {
  max-width: 68ch;
  margin: 0;
  color: var(--platform-text-secondary);
  line-height: 1.7;
}

.ai-core-history-intro small {
  max-width: 32ch;
  color: var(--platform-text-tertiary);
  text-align: right;
}

.ai-core-history-landing {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(0.85rem, 1.5vw, 1.2rem);
}

.ai-core-history-landing > button {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.45rem 1rem;
  min-width: 0;
  padding: clamp(1.15rem, 2vw, 1.65rem);
  overflow: hidden;
  color: var(--platform-text-primary);
  text-align: left;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--platform-accent) 10%, transparent), transparent 58%),
    color-mix(in srgb, var(--platform-surface-strong) 88%, transparent);
  border: 1px solid color-mix(in srgb, var(--platform-accent) 25%, var(--platform-border));
  border-radius: 1.15rem;
  cursor: pointer;
}

.ai-core-history-landing > button::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(var(--platform-accent), transparent 78%);
}

.ai-core-history-landing > button > span,
.ai-core-history-version-header p,
.ai-core-history-overview > div > p,
.ai-core-history-explorer > nav > p,
.ai-core-history-document header p {
  margin: 0;
  color: var(--platform-accent);
  font-size: 0.72rem;
  font-weight: 760;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.ai-core-history-landing > button > small {
  justify-self: end;
  color: var(--platform-text-tertiary);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ai-core-history-landing > button > strong {
  grid-column: 1 / -1;
  max-width: 26ch;
  margin: 0.25rem 0 0.4rem;
  font-family: var(--platform-font-display);
  font-size: clamp(1.2rem, 2.1vw, 1.7rem);
  line-height: 1.16;
}

.ai-core-history-landing > button > div {
  grid-column: 1 / -1;
  color: var(--platform-text-secondary);
  font-size: 0.86rem;
}

.ai-core-history-landing > button > div b {
  color: var(--platform-text-primary);
  font-size: 1rem;
}

.ai-core-history-landing > button > em {
  grid-column: 1 / -1;
  margin-top: 0.7rem;
  color: var(--platform-accent);
  font-size: 0.84rem;
  font-style: normal;
  font-weight: 720;
}

.ai-core-history-landing > button:hover {
  border-color: color-mix(in srgb, var(--platform-accent) 62%, var(--platform-border));
  transform: translateY(-2px);
}

.ai-core-history :is(button, a):focus-visible {
  outline: 3px solid color-mix(in srgb, var(--platform-accent) 66%, white);
  outline-offset: 3px;
}

.ai-core-history-version-panel {
  display: grid;
  gap: clamp(1.2rem, 2.6vw, 2rem);
  min-width: 0;
  scroll-margin-top: 7rem;
}

.ai-core-history-back {
  justify-self: start;
  padding: 0.55rem 0.8rem;
  color: var(--platform-text-secondary);
  background: transparent;
  border: 1px solid var(--platform-border);
  border-radius: 999px;
  cursor: pointer;
}

.ai-core-history-back:hover {
  color: var(--platform-text-primary);
  border-color: color-mix(in srgb, var(--platform-accent) 50%, var(--platform-border));
}

.ai-core-history-version-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem 2rem;
  align-items: end;
  padding: clamp(1.2rem, 2vw, 1.7rem);
  background:
    radial-gradient(circle at 92% 10%, color-mix(in srgb, var(--platform-accent) 18%, transparent), transparent 30%),
    color-mix(in srgb, var(--platform-surface-strong) 92%, transparent);
  border: 1px solid color-mix(in srgb, var(--platform-accent) 24%, var(--platform-border));
  border-radius: 1.1rem;
}

.ai-core-history-version-header h3 {
  max-width: 26ch;
  margin: 0.35rem 0 0.6rem;
  font-family: var(--platform-font-display);
  font-size: clamp(1.55rem, 3vw, 2.45rem);
  line-height: 1.08;
}

.ai-core-history-version-header time {
  color: var(--platform-text-tertiary);
  font-size: 0.82rem;
}

.ai-core-history-version-header > div:last-child {
  display: flex;
  gap: 0.75rem;
}

.ai-core-history-version-header > div:last-child span {
  display: grid;
  gap: 0.2rem;
  min-width: 7.5rem;
  padding: 0.8rem 0.9rem;
  color: var(--platform-text-secondary);
  font-size: 0.72rem;
  background: color-mix(in srgb, var(--platform-background) 72%, transparent);
  border: 1px solid var(--platform-border);
  border-radius: 0.8rem;
}

.ai-core-history-version-header > div:last-child strong {
  color: var(--platform-text-primary);
  font-size: 1.35rem;
}

.ai-core-history-overview {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(15rem, 0.75fr);
  gap: clamp(1rem, 2vw, 1.5rem);
}

.ai-core-history-overview > div,
.ai-core-history-overview > aside {
  min-width: 0;
  padding: clamp(1rem, 2vw, 1.45rem);
  background: color-mix(in srgb, var(--platform-surface) 86%, transparent);
  border: 1px solid var(--platform-border);
  border-radius: 1rem;
}

.ai-core-history-overview dl,
.ai-core-history-node-facts,
.ai-core-history-document-facts,
.ai-core-history-document-notes {
  display: grid;
  gap: 0;
  margin: 0.7rem 0 0;
}

.ai-core-history-overview dl > div,
.ai-core-history-node-facts > div,
.ai-core-history-document-notes > div {
  display: grid;
  grid-template-columns: minmax(8.5rem, 0.3fr) minmax(0, 1fr);
  gap: 0.8rem 1rem;
  padding: 0.9rem 0;
  border-top: 1px solid color-mix(in srgb, var(--platform-border) 72%, transparent);
}

.ai-core-history-overview dt,
.ai-core-history-node-facts dt,
.ai-core-history-document-facts dt,
.ai-core-history-document-notes dt {
  color: var(--platform-text-tertiary);
  font-size: 0.72rem;
  font-weight: 720;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ai-core-history-overview dd,
.ai-core-history-node-facts dd,
.ai-core-history-document-facts dd,
.ai-core-history-document-notes dd {
  min-width: 0;
  margin: 0;
  color: var(--platform-text-secondary);
  line-height: 1.68;
  overflow-wrap: anywhere;
}

.ai-core-history-overview aside h4 {
  margin: 0 0 0.7rem;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ai-core-history-overview aside h4:not(:first-child) {
  margin-top: 1.4rem;
}

.ai-core-history-overview aside > ul {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  color: var(--platform-text-secondary);
  list-style: none;
}

.ai-core-history-overview aside > ul:not(.ai-core-history-guardrails) li {
  position: relative;
  padding-left: 1rem;
  line-height: 1.45;
}

.ai-core-history-overview aside > ul:not(.ai-core-history-guardrails) li::before {
  content: "";
  position: absolute;
  top: 0.55em;
  left: 0;
  width: 0.35rem;
  height: 0.35rem;
  background: var(--platform-accent);
  border-radius: 50%;
}

.ai-core-history-guardrails li {
  display: grid;
  gap: 0.35rem;
  padding: 0.65rem 0;
  border-top: 1px solid color-mix(in srgb, var(--platform-border) 65%, transparent);
}

.ai-core-history-guardrails li > span:last-child {
  line-height: 1.45;
}

.ai-core-history-summary-document {
  width: 100%;
  margin-top: 1.1rem;
  padding: 0.8rem;
  color: var(--platform-accent);
  text-align: left;
  background: color-mix(in srgb, var(--platform-accent) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--platform-accent) 30%, var(--platform-border));
  border-radius: 0.7rem;
  cursor: pointer;
}

.ai-core-history-explorer {
  display: grid;
  grid-template-columns: minmax(17rem, 0.72fr) minmax(0, 1.45fr);
  gap: clamp(1rem, 2vw, 1.5rem);
  align-items: start;
  min-width: 0;
}

.ai-core-history-explorer > nav {
  display: grid;
  gap: 1rem;
  max-height: min(72vh, 52rem);
  padding: 1rem;
  overflow: auto;
  background: color-mix(in srgb, var(--platform-surface) 88%, transparent);
  border: 1px solid var(--platform-border);
  border-radius: 1rem;
  scrollbar-width: thin;
}

.ai-core-history-explorer > nav section {
  display: grid;
  gap: 0.55rem;
}

.ai-core-history-explorer > nav h4 {
  margin: 0;
  padding-bottom: 0.55rem;
  color: var(--platform-text-secondary);
  font-size: 0.78rem;
  line-height: 1.35;
  border-bottom: 1px solid color-mix(in srgb, var(--platform-border) 70%, transparent);
}

.ai-core-history-explorer > nav section > div {
  display: grid;
  gap: 0.4rem;
}

.ai-core-history-explorer > nav button {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 0.6rem;
  min-width: 0;
  padding: 0.7rem;
  color: var(--platform-text-primary);
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 0.7rem;
  cursor: pointer;
}

.ai-core-history-explorer > nav button:hover,
.ai-core-history-explorer > nav button[aria-pressed="true"] {
  background: color-mix(in srgb, var(--platform-accent) 9%, var(--platform-surface-strong));
  border-color: color-mix(in srgb, var(--platform-accent) 34%, var(--platform-border));
}

.ai-core-history-explorer > nav button span {
  grid-row: 1 / 3;
  color: var(--platform-accent);
  font: 700 0.68rem/1.3 var(--platform-font-mono);
}

.ai-core-history-explorer > nav button strong {
  min-width: 0;
  font-size: 0.8rem;
  line-height: 1.35;
}

.ai-core-history-explorer > nav button small {
  color: var(--platform-text-tertiary);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
}

.ai-core-history-node-stage {
  min-width: 0;
}

.ai-core-history-node-placeholder,
.ai-core-history-empty-value {
  margin: 0;
  padding: 1.2rem;
  color: var(--platform-text-tertiary);
  background: color-mix(in srgb, var(--platform-surface) 80%, transparent);
  border: 1px dashed var(--platform-border);
  border-radius: 0.9rem;
}

.ai-core-history-node-detail,
.ai-core-history-document {
  min-width: 0;
  padding: clamp(1rem, 2vw, 1.5rem);
  scroll-margin-top: 7rem;
  background: color-mix(in srgb, var(--platform-surface-strong) 91%, transparent);
  border: 1px solid color-mix(in srgb, var(--platform-accent) 22%, var(--platform-border));
  border-radius: 1rem;
}

.ai-core-history-node-detail > header,
.ai-core-history-document > header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--platform-border);
}

.ai-core-history-node-detail > header p {
  margin: 0;
  color: var(--platform-accent);
  font: 700 0.68rem/1.4 var(--platform-font-mono);
  letter-spacing: 0.04em;
}

.ai-core-history-node-detail > header h3,
.ai-core-history-document > header h3 {
  max-width: 30ch;
  margin: 0.4rem 0;
  font-family: var(--platform-font-display);
  font-size: clamp(1.25rem, 2.2vw, 1.8rem);
  line-height: 1.15;
}

.ai-core-history-node-detail > header time {
  color: var(--platform-text-tertiary);
  font-size: 0.78rem;
}

.ai-core-history-sequence {
  flex: 0 0 auto;
  padding: 0.38rem 0.58rem;
  color: var(--platform-accent);
  font-size: 0.68rem;
  font-weight: 780;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid color-mix(in srgb, var(--platform-accent) 42%, var(--platform-border));
  border-radius: 999px;
}

.ai-core-history-authoritative {
  margin: 0.65rem 0;
  padding: 0.9rem !important;
  background: color-mix(in srgb, var(--platform-accent) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--platform-accent) 26%, var(--platform-border)) !important;
  border-radius: 0.75rem;
}

.ai-core-history-node-facts a {
  color: var(--platform-accent);
  overflow-wrap: anywhere;
}

.ai-core-history-node-documents {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--platform-border);
}

.ai-core-history-node-documents h4 {
  display: flex;
  justify-content: space-between;
  margin: 0 0 0.7rem;
  font-size: 0.78rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.ai-core-history-node-documents h4 span {
  color: var(--platform-accent);
}

.ai-core-history-node-documents > div {
  display: grid;
  gap: 0.55rem;
}

.ai-core-history-node-documents button {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.3rem 0.8rem;
  min-width: 0;
  padding: 0.8rem;
  color: var(--platform-text-primary);
  text-align: left;
  background: color-mix(in srgb, var(--platform-background) 60%, transparent);
  border: 1px solid var(--platform-border);
  border-radius: 0.7rem;
  cursor: pointer;
}

.ai-core-history-node-documents button:hover {
  border-color: color-mix(in srgb, var(--platform-accent) 48%, var(--platform-border));
}

.ai-core-history-node-documents button span {
  grid-column: 1 / -1;
  color: var(--platform-text-tertiary);
  font: 650 0.65rem/1.35 var(--platform-font-mono);
}

.ai-core-history-node-documents button strong {
  min-width: 0;
  font-size: 0.82rem;
  line-height: 1.35;
}

.ai-core-history-node-documents button small {
  align-self: end;
  color: var(--platform-accent);
  white-space: nowrap;
}

.ai-core-history-reader {
  scroll-margin-top: 5rem;
}

.ai-core-history-document {
  border-color: color-mix(in srgb, var(--platform-accent) 46%, var(--platform-border));
  box-shadow: 0 1.2rem 3rem color-mix(in srgb, black 20%, transparent);
}

.ai-core-history-document-facts {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin-top: 1rem;
  border-top: 1px solid var(--platform-border);
  border-left: 1px solid var(--platform-border);
}

.ai-core-history-document-facts > div {
  display: grid;
  gap: 0.35rem;
  padding: 0.85rem;
  border-right: 1px solid var(--platform-border);
  border-bottom: 1px solid var(--platform-border);
}

.ai-core-history-document-facts > .ai-core-history-document-wide {
  grid-column: 1 / -1;
}

.ai-core-history-document > section {
  margin-top: 1.25rem;
}

.ai-core-history-document > section h4 {
  margin: 0 0 0.65rem;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ai-core-history-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
  margin: 0;
}

.ai-core-history-metrics > div {
  min-width: 0;
  padding: 0.75rem;
  background: color-mix(in srgb, var(--platform-accent) 7%, transparent);
  border: 1px solid color-mix(in srgb, var(--platform-accent) 20%, var(--platform-border));
  border-radius: 0.65rem;
}

.ai-core-history-metrics dt {
  color: var(--platform-text-tertiary);
  font-size: 0.67rem;
  line-height: 1.3;
}

.ai-core-history-metrics dd {
  margin: 0.35rem 0 0;
  color: var(--platform-text-primary);
  font: 700 1rem/1.2 var(--platform-font-mono);
  overflow-wrap: anywhere;
}

.ai-core-history-metrics dd small {
  color: var(--platform-text-tertiary);
  font: inherit;
  font-size: 0.7rem;
}

.ai-core-history-document .ai-core-history-back {
  margin-top: 1rem;
}

.ai-core-status--not-authorized,
.ai-core-status--no-stage-pass,
.ai-core-status--scoped-only,
.ai-core-status--separate-facts,
.ai-core-status--unresolved,
.ai-core-status--no-safe-audit-product-repair,
.ai-core-status--no-measurable-estimator-proven,
.ai-core-status--mixed-product-and-measurement-variance {
  color: var(--platform-text-secondary);
  background: color-mix(in srgb, var(--platform-text-secondary) 8%, transparent);
  border-color: color-mix(in srgb, var(--platform-text-secondary) 24%, var(--platform-border));
}

@media (max-width: 900px) {
  .ai-core-history-intro,
  .ai-core-history-version-header {
    align-items: flex-start;
  }

  .ai-core-history-overview,
  .ai-core-history-explorer {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-core-history-explorer > nav {
    max-height: none;
  }

  .ai-core-history-explorer > nav section > div {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .ai-core-history-intro,
  .ai-core-history-version-header,
  .ai-core-history-node-detail > header,
  .ai-core-history-document > header {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-core-history-intro small {
    text-align: left;
  }

  .ai-core-history-landing,
  .ai-core-history-explorer > nav section > div,
  .ai-core-history-document-facts,
  .ai-core-history-metrics {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-core-history-version-header > div:last-child {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ai-core-history-version-header > div:last-child span {
    min-width: 0;
  }

  .ai-core-history-overview dl > div,
  .ai-core-history-node-facts > div,
  .ai-core-history-document-notes > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.35rem;
  }

  .ai-core-history-document-facts > .ai-core-history-document-wide {
    grid-column: auto;
  }

  .ai-core-history-node-documents button {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-core-history-node-documents button small {
    white-space: normal;
  }
}