@media (max-width: 1099px) {
  :root {
    --section-padding: 72px;
  }

  h1 {
    font-size: 58px;
    line-height: 1;
  }

  h2 {
    font-size: 40px;
    line-height: 1.08;
  }

  .container,
  .section-shell,
  .header-inner,
  .hero-grid,
  .site-footer > .section-shell,
  .article-shell {
    width: min(100% - (2 * var(--page-gutter-tablet)), var(--container-max));
  }

  .header-action {
    display: none;
  }

  .primary-nav {
    gap: var(--space-4);
  }

  .primary-nav .mobile-access-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 8px;
    border-radius: var(--radius-button);
    background: var(--coral);
    color: var(--text-primary-light);
    font-size: 13px;
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
  }

  .hero-grid {
    align-items: start;
    min-height: auto;
  }

  .hero-copy {
    grid-column: 1 / -1;
    margin-bottom: var(--space-7);
  }

  .hero-index-proof {
    grid-column: 1 / -1;
  }

  .index-page-hero .page-hero-grid {
    display: block;
  }

  .index-page-hero .page-hero-grid > :last-child {
    max-width: 680px;
    padding-top: var(--space-6);
  }

  .hero-copy h1 {
    transform: none;
  }

  .strategy-visual {
    grid-column: 1 / -1;
    min-height: 560px;
  }

  .proof-points {
    grid-template-columns: 1fr;
  }

  .index-terminal {
    grid-template-columns: 7fr 5fr;
  }

  .index-chart-head {
    display: block;
  }

  .index-chart-head small {
    margin-top: var(--space-3);
  }

  .index-metric-grid {
    grid-template-columns: 1fr;
  }

  .index-metric,
  .index-metric:nth-child(even),
  .index-metric:nth-last-child(-n + 2) {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--border-light);
  }

  .index-metric:last-child {
    border-bottom: 0;
  }

  .output-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .engagement-format-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .workflow {
    display: flex;
    overflow-x: auto;
    padding-bottom: var(--space-3);
    scroll-snap-type: x mandatory;
  }

  .workflow li {
    flex: 0 0 min(300px, 42vw);
    min-height: 200px;
    scroll-snap-align: start;
  }

  .workflow::before {
    display: none;
  }

  .footer-main {
    grid-template-columns: 2fr 1fr 1fr;
  }

  .footer-controls {
    grid-column: 1 / -1;
    padding-top: var(--space-5);
    border-top: 1px solid var(--border-dark);
  }

  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-body h2,
  .article-author h2,
  .article-citation h2 {
    font-size: 36px;
    line-height: 1.08;
  }

  .article-rail {
    position: static;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .record-facts {
    grid-template-columns: 1fr;
  }

  .index-page-record {
    display: block;
  }

  .passport-page-grid {
    display: block;
  }

  .passport-page-grid .passport-preview-card {
    margin-top: var(--space-6);
  }

  .index-page-record .record-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: var(--space-4);
  }

  .index-status-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .index-status-panel > div:nth-child(2) {
    border-right: 0;
  }

  .index-status-panel > div:nth-child(-n + 2) {
    border-bottom: 1px solid var(--border-light);
  }

  .partner-proof-band > .section-shell,
  .platform-availability,
  .index-conversion-bridge > .section-shell,
  .research-roadmap,
  .partner-application-grid,
  .partner-commercial-summary {
    grid-template-columns: 1fr;
  }

  .partner-commercial-summary > div,
  .partner-commercial-summary > div:first-child,
  .partner-commercial-summary > div:last-child {
    padding: var(--space-4) 0;
    border-right: 0;
    border-bottom: 1px solid var(--border-dark);
  }

  .partner-commercial-summary > div:last-child {
    border-bottom: 0;
  }

  .partner-proof-band .button,
  .index-conversion-bridge .inline-actions {
    justify-self: start;
  }

  .partner-process {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 899px) {
  .brand {
    width: 154px;
  }

  .menu-button {
    display: grid;
    place-content: center;
    width: 46px;
    height: 46px;
    padding: 0;
    margin-left: auto;
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-button);
    background: var(--bg-panel);
  }

  .menu-button span {
    display: block;
    width: 20px;
    height: 1px;
    margin: 3px;
    background: var(--text-primary-dark);
  }

  .primary-nav {
    position: fixed;
    inset: var(--header-height) 0 auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    height: calc(100dvh - var(--header-height));
    padding: var(--space-6) var(--page-gutter-tablet);
    overflow-y: auto;
    overscroll-behavior-y: contain;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
    background: var(--bg-primary);
  }

  .primary-nav.is-open {
    display: flex;
  }

  .primary-nav a {
    padding-block: var(--space-4);
    border-bottom: 1px solid var(--border-dark);
    color: var(--text-primary-dark);
    font-size: 18px;
  }

  .primary-nav .mobile-access-link {
    min-height: 46px;
    margin-top: var(--space-4);
    padding: 0 var(--space-5);
    border-bottom: 0;
    color: var(--text-primary-light);
    font-size: 15px;
  }

  .method-toc {
    top: var(--header-height);
  }

  .method-toc .section-shell {
    padding-block: var(--space-3);
  }

  .page-toc-disclosure summary {
    display: block;
    color: var(--text-primary-dark);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
  }

  .page-toc-links {
    display: grid;
    gap: var(--space-2);
    max-height: min(58vh, 420px);
    padding-top: var(--space-3);
    overflow-y: auto;
  }

  .page-toc-links span {
    display: none;
  }

  .page-toc-links a {
    padding-block: var(--space-2);
    border-top: 1px solid var(--border-dark);
  }

  .founder-profile {
    grid-template-columns: minmax(220px, 4fr) minmax(0, 8fr);
    gap: var(--space-6);
  }

  .founder-credibility {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .founder-credibility > div:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--border-light);
  }

  .founder-credibility > div:nth-child(4) {
    border-top: 1px solid var(--border-light);
  }

  .workflow {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    overflow: visible;
    padding-bottom: 0;
  }

  .workflow li {
    min-height: 0;
  }
}

@media (max-width: 719px) {
  :root {
    --section-padding: 40px;
    --header-height: 64px;
  }

  h1 {
    font-size: 44px;
    line-height: 1.02;
  }

  h2 {
    font-size: 32px;
    line-height: 1.1;
  }

  h3 {
    font-size: 24px;
  }

  .container,
  .section-shell,
  .header-inner,
  .hero-grid,
  .site-footer > .section-shell,
  .article-shell {
    width: calc(100% - (2 * var(--page-gutter-mobile)));
  }

  .brand {
    width: 154px;
  }

  .menu-button {
    display: grid;
    place-content: center;
    width: 46px;
    height: 46px;
    padding: 0;
    margin-left: auto;
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-button);
    background: var(--bg-panel);
  }

  .menu-button span {
    display: block;
    width: 20px;
    height: 1px;
    margin: 3px;
    background: var(--text-primary-dark);
  }

  .primary-nav {
    position: fixed;
    inset: var(--header-height) 0 auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    height: calc(100dvh - var(--header-height));
    padding: var(--space-6) var(--page-gutter-mobile);
    overflow-y: auto;
    background: var(--bg-primary);
  }

  .formula-grid {
    grid-template-columns: 1fr;
  }

  .formula-grid > article:last-child {
    grid-column: auto;
  }

  .primary-nav.is-open {
    display: flex;
  }

  .primary-nav a {
    padding-block: var(--space-4);
    border-bottom: 1px solid var(--border-dark);
    color: var(--text-primary-dark);
    font-size: 18px;
  }

  .home-hero,
  .page-hero,
  .article-header {
    padding-top: 112px;
    padding-bottom: var(--space-7);
  }

  .hero-grid {
    display: block;
    min-height: auto;
  }

  .hero-copy {
    margin-bottom: var(--space-7);
  }

  .hero-summary {
    font-size: 16px;
  }

  .hero-copy h1 {
    width: 100%;
    font-size: clamp(30px, 8.45vw, 35px);
    line-height: 1.08;
    letter-spacing: -0.045em;
  }

  .hero-actions {
    display: grid;
  }

  .hero-actions .button {
    width: 100%;
  }

  .hero-proof-link {
    padding-inline: 0;
  }

  .hero-index-proof {
    padding: var(--space-5);
  }

  .hero-proof-head,
  .hero-proof-foot {
    display: grid;
  }

  .hero-proof-level {
    padding-block: var(--space-6);
  }

  .hero-proof-level strong {
    font-size: 64px;
  }

  .hero-proof-metrics {
    grid-template-columns: 1fr;
  }

  .hero-proof-metrics > div {
    padding: var(--space-4) 0;
  }

  .hero-proof-metrics > div + div {
    padding-left: 0;
    border-left: 0;
  }

  .hero-proof-foot span:last-child {
    max-width: none;
    text-align: left;
  }

  .proof-points {
    grid-template-columns: 1fr;
  }

  .strategy-visual {
    min-height: 0;
    overflow: hidden;
  }

  .interface-label {
    top: var(--space-3);
    right: var(--space-3);
  }

  .universe-map-visual {
    position: relative;
    height: 190px;
    border-bottom: 1px solid var(--border-dark);
  }

  .universe-head {
    top: var(--space-7);
    left: var(--space-4);
  }

  .universe-map-visual svg {
    inset: 32px 0 auto;
    width: 100%;
    height: 210px;
  }

  .scanner {
    bottom: auto;
    height: 190px;
  }

  .intelligence-panel {
    position: relative;
    right: auto;
    bottom: auto;
    width: auto;
    padding: var(--space-4);
    margin: var(--space-4);
    box-shadow: none;
  }

  .panel-records {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2) var(--space-3);
    margin-bottom: var(--space-4);
  }

  .panel-record {
    padding-top: var(--space-2);
  }

  .panel-caveat {
    padding: var(--space-3);
    margin-bottom: var(--space-3);
  }

  .panel-action-row {
    display: block;
  }

  .panel-action-row .button {
    width: 100%;
  }

  .section-heading,
  .page-section-heading,
  .system-heading,
  .product-heading,
  .services-heading,
  .research-heading,
  .trust-heading,
  .access-heading,
  .page-hero-grid,
  .subscribe-panel,
  .platform-cta > .section-shell,
  .platform-cta.section-shell {
    display: block;
  }

  .compact-cta > .section-shell {
    display: block;
    padding: var(--space-5);
  }

  .compact-cta .button {
    margin-top: var(--space-4);
  }

  .section-heading > :last-child,
  .page-section-heading > :last-child,
  .system-heading > :last-child,
  .product-heading > :last-child,
  .services-heading > :last-child,
  .research-heading > :last-child,
  .trust-heading > :last-child,
  .access-heading > :last-child,
  .page-hero-grid > :last-child {
    padding-top: var(--space-4);
  }

  .section-heading.heading-single > :only-child,
  .page-section-heading.heading-single > :only-child {
    padding-top: 0;
  }

  .section-heading,
  .page-section-heading,
  .system-heading,
  .product-heading,
  .services-heading,
  .research-heading,
  .trust-heading,
  .access-heading {
    margin-bottom: var(--space-6);
  }

  .index-terminal,
  .stage-preview,
  .agent-demo,
  .research-services-grid,
  .access-grid,
  .index-page-record,
  .passport-page-grid,
  .index-chart-grid,
  .about-mission-grid,
  .about-principles-grid {
    display: block;
  }

  .about-mission-grid article,
  .about-principles-grid article {
    margin-top: var(--space-4);
  }

  .index-page-hero h1 {
    max-width: 100%;
    font-size: 42px;
    line-height: 1.04;
  }

  .record-hero {
    min-height: 190px;
  }

  .record-hero > strong {
    font-size: 52px;
  }

  .record-facts {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
    margin-top: var(--space-3);
  }

  .record-facts > div {
    min-height: 132px;
    padding: var(--space-4);
  }

  .record-facts strong {
    font-size: 18px;
  }

  .index-status-panel {
    grid-template-columns: 1fr;
  }

  .index-status-panel > div,
  .index-status-panel > div:nth-child(2) {
    border-right: 0;
    border-bottom: 1px solid var(--border-light);
  }

  .index-status-panel > div:last-child {
    border-bottom: 0;
  }

  .index-chart-panel,
  .agent-query {
    border-right: 0;
    border-bottom: 1px solid var(--border-light);
  }

  .index-value strong {
    font-size: 34px;
  }

  .index-chart-panel {
    padding: var(--space-5);
  }

  .index-metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .index-metric,
  .index-metric:nth-child(even),
  .index-metric:nth-last-child(-n + 2) {
    min-height: 136px;
    padding: var(--space-4);
    border-right: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
  }

  .index-metric:nth-child(even) {
    border-right: 0;
  }

  .index-metric:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .index-metric strong {
    font-size: 20px;
  }

  .index-note {
    display: block;
  }

  .stage-tabs {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    max-width: 100%;
    overflow: visible;
    padding-bottom: 0;
  }

  .stage-tab {
    min-height: 58px;
    padding: var(--space-2);
    font-size: 12px;
    text-align: center;
  }

  .stage-tab span {
    font-size: 12px;
  }

  .evidence-record,
  .candidate,
  .research-services-grid,
  .access-grid,
  .trust-items,
  .form-grid,
  .workflow,
  .publication-grid,
  .series-grid,
  .distribution-grid,
  .service-page-grid,
  .boundary-grid,
  .bias-grid,
  .dimension-grid,
  .maturity-grid,
  .three-state-grid,
  .output-grid,
  .faq-grid,
  .history-phases {
    grid-template-columns: 1fr;
  }

  .publication-grid > *,
  .service-page-grid > * {
    grid-column: 1 / -1;
  }

  .publication-grid-focused.publication-grid-two > .publication-lead {
    grid-column: 1 / -1;
  }

  .definition-open-list {
    grid-template-columns: 1fr;
  }

  .dimension-grid > *,
  .open-dimension-grid > * {
    grid-column: auto;
  }

  .candidate {
    display: grid;
    grid-template-columns: auto 1fr;
  }

  .output-row {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .platform-open-intro {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .available-surfaces,
  .partner-fit-grid,
  .partner-boundary-grid,
  .partner-scope-boundary,
  .partner-process {
    grid-template-columns: 1fr;
  }

  .available-surfaces article {
    min-height: 0;
  }

  .available-surfaces article:last-of-type {
    grid-column: auto;
  }

  .partner-page-hero h1 {
    font-size: 38px;
  }

  .partner-hero-link {
    display: flex;
    margin: var(--space-4) 0 0;
  }

  .access-tertiary .text-link {
    display: flex;
    width: fit-content;
    margin: var(--space-2) 0 0;
  }

  .partner-application-form,
  .partner-fit-grid article,
  .partner-boundary-grid article,
  .partner-scope-boundary article {
    padding: var(--space-4);
  }

  .partner-middle-cta {
    align-items: flex-start;
    flex-direction: column;
    padding: var(--space-4);
  }

  .index-chart-grid figcaption {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .index-chart-grid figcaption strong {
    text-align: left;
  }

  .table-scroll-hint {
    display: block;
    margin: var(--space-4) 0 var(--space-2);
    color: var(--text-secondary-light);
    font-size: 12px;
  }

  .engagement-format-grid,
  .passport-signal-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .founder-profile,
  .founder-credibility {
    grid-template-columns: 1fr;
  }

  .founder-portrait {
    max-height: none;
  }

  .founder-copy {
    padding-top: 0;
  }

  .founder-copy > p {
    font-size: 16px;
  }

  .founder-copy blockquote {
    padding: var(--space-5) 0 var(--space-1) var(--space-5);
    font-size: 20px;
  }

  .founder-credibility > div + div,
  .founder-credibility > div:nth-child(3),
  .founder-credibility > div:nth-child(4) {
    border-left: 0;
    border-top: 1px solid var(--border-light);
  }

  .stage-preview {
    padding: var(--space-4);
  }

  .stage-copy p {
    margin-bottom: var(--space-4);
  }

  .evidence-record {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
  }

  .evidence-record > div {
    min-height: 88px;
    padding: var(--space-3);
  }

  .output-row article {
    min-height: 0;
    padding: var(--space-3);
  }

  .output-row .status {
    margin-bottom: var(--space-3);
  }

  .output-row h3 {
    font-size: 18px;
  }

  .candidate .confidence {
    grid-column: 2;
  }

  .featured-publication,
  .services-compact,
  .access-card,
  .partner-card,
  .agent-query,
  .agent-results,
  .stage-preview,
  .record-hero,
  .index-status-panel,
  .passport-preview-card {
    padding: var(--space-5);
  }

  .featured-publication,
  .services-compact,
  .access-card,
  .partner-card {
    padding: var(--space-4);
  }

  .featured-publication {
    margin-bottom: var(--space-4);
  }

  .services-compact .service-choice {
    padding-block: var(--space-4);
  }

  .trust-items {
    gap: var(--space-4);
  }

  .site-footer {
    padding-block: var(--space-6) var(--space-4);
  }

  .footer-main {
    gap: var(--space-4);
    padding-bottom: var(--space-4);
  }

  .footer-brand p {
    font-size: 14px;
    line-height: 1.55;
  }

  .footer-logo {
    margin-bottom: var(--space-4);
  }

  .footer-links,
  .footer-controls {
    gap: var(--space-2);
  }

  .footer-controls {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-controls > span,
  .footer-controls > p {
    grid-column: 1 / -1;
  }

  .footer-main {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-brand,
  .footer-controls {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-2);
    padding-top: var(--space-4);
  }

  .article-rail {
    display: none;
  }

  .mobile-article-toc {
    position: sticky;
    top: 72px;
    z-index: 20;
    display: block;
    margin-bottom: var(--space-5);
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-button);
    background: var(--bg-panel);
  }

  .mobile-article-toc summary {
    padding: var(--space-3) var(--space-4);
    font-size: 14px;
  }

  .mobile-article-toc nav {
    display: grid;
    gap: var(--space-2);
    padding: 0 var(--space-4) var(--space-4);
  }

  .mobile-article-toc a {
    color: var(--text-secondary-dark);
    font-size: 14px;
  }

  .article-body h2,
  .article-author h2,
  .article-citation h2 {
    font-size: 34px;
    line-height: 1.1;
  }

  .policy-content section {
    padding-block: var(--space-5);
  }

  .research-filter-bar .section-shell,
  .research-filter-bar label {
    align-items: stretch;
    flex-direction: column;
  }

  .research-filter-bar label,
  .research-filter-bar input,
  .research-filter-bar [role="group"] {
    width: 100%;
    max-width: 100%;
    min-width: 0;
  }

  .research-filter-bar [role="group"] {
    flex-wrap: nowrap;
    overflow-x: auto;
  }

  .research-filter-bar button {
    flex: 0 0 auto;
  }

  .workflow {
    display: grid;
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .workflow li {
    min-height: 0;
  }

  .history-table-wrap {
    overflow: visible;
    border: 0;
    border-radius: 0;
    background: transparent;
    contain: none;
  }

  .history-table,
  .article-body .history-table {
    display: block;
    min-width: 0;
  }

  .history-table caption {
    display: block;
    margin-bottom: var(--space-3);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    background: var(--white);
  }

  .history-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
  }

  .history-table tbody {
    display: grid;
    gap: var(--space-3);
  }

  .history-table tr,
  .history-table th,
  .history-table td {
    display: block;
    width: 100%;
  }

  .history-table tr {
    overflow: hidden;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    background: var(--white);
  }

  .history-table th,
  .history-table td,
  .history-table tbody tr:last-child th,
  .history-table tbody tr:last-child td {
    padding: var(--space-4);
    border: 0;
    border-bottom: 1px solid var(--border-light);
    border-radius: 0;
    background: transparent;
  }

  .history-table tr > :last-child {
    border-bottom: 0;
  }

  .history-table td::before {
    content: attr(data-label);
    display: block;
    margin-bottom: var(--space-2);
    color: var(--purple);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }

  .agent-demo {
    padding-top: 56px;
  }

  .agent-interface-label {
    left: var(--space-4);
    right: auto;
  }

  .stage-preview {
    padding: var(--space-4);
  }

  .agent-query,
  .agent-results {
    padding: var(--space-4);
  }

  .query-box {
    margin-top: var(--space-4);
    padding: var(--space-4);
    font-size: 16px;
  }

  .interpreted-constraints {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2) var(--space-4);
    margin-top: var(--space-4);
  }

  .interpreted-constraints > div {
    display: block;
    padding-top: var(--space-2);
  }

  .interpreted-constraints dd {
    margin-top: var(--space-1);
  }

  .candidate {
    padding: var(--space-3);
  }

  .agent-results .candidate:nth-of-type(n + 3) {
    display: none;
  }

  .agent-next {
    margin-top: 0;
  }

  .passport-field-groups {
    grid-template-columns: 1fr;
  }

  .passport-field-group:last-child {
    grid-column: auto;
  }

  .candidate h3 {
    font-size: 16px;
  }

  .candidate p {
    font-size: 12px;
    line-height: 1.5;
  }

  .candidate .confidence {
    margin-top: calc(-1 * var(--space-1));
  }

  .agent-results .candidate:nth-of-type(3) {
    display: none;
  }

  .partner-seat {
    margin-bottom: var(--space-5);
  }

  .article-links a {
    padding-block: var(--space-3);
  }

  .featured-publication h3,
  .article-links {
    margin-block: var(--space-4);
  }

  .trust-strip {
    padding-block: var(--space-5);
  }

  .error-page main {
    width: calc(100% - (2 * var(--page-gutter-mobile)));
  }
}