@media (max-width: 1100px) {
  .site-shell {
    grid-template-columns: 1fr;
    width: min(calc(100% - 2rem), 1100px);
    padding-top: 0;
  }

  .desktop-toc {
    display: none;
  }

  .mobile-index {
    position: sticky;
    z-index: 50;
    top: 0;
    display: block;
    width: min(calc(100% - 2rem), 1100px);
    margin: 0 auto;
    border: 1px solid rgba(39, 35, 30, 0.2);
    border-top: 0;
    background: rgba(244, 239, 228, 0.97);
    box-shadow: var(--shadow-soft);
  }

  .mobile-index summary {
    display: flex;
    min-height: 3.6rem;
    align-items: center;
    justify-content: space-between;
    padding: 0.7rem 1rem;
    cursor: pointer;
    font-weight: 600;
    list-style: none;
  }

  .mobile-index summary::-webkit-details-marker {
    display: none;
  }

  .mobile-index summary::after {
    color: var(--primary-color);
    content: "+";
  }

  .mobile-index[open] summary::after {
    content: "−";
  }

  .mobile-index nav {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding: 0 1rem 1rem;
    border-top: 1px solid var(--border-color);
  }

  .mobile-index nav a {
    padding: 0.7rem;
    border-bottom: 1px solid var(--border-color);
    text-decoration: none;
  }

  .document-cover,
  .document-metadata {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cover-heading,
  .cover-note,
  .document-index,
  .document-metadata {
    grid-column: 1 / -1;
  }

  .cover-note {
    max-width: 34rem;
  }

  .quick-links {
    grid-template-columns: repeat(3, minmax(10rem, 1fr));
  }

  .quick-link:nth-child(3) {
    border-right: 0;
  }

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

@media (max-width: 760px) {
  .site-shell,
  .mobile-index {
    width: 100%;
  }

  .site-shell {
    gap: 0;
    padding: 0;
  }

  .mobile-index {
    border-right: 0;
    border-left: 0;
  }

  .mobile-index nav {
    grid-template-columns: 1fr 1fr;
    max-height: 62vh;
    overflow-y: auto;
  }

  .site-document {
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .paper-section {
    padding-right: 1.25rem;
    padding-left: 1.25rem;
  }

  .section-tall,
  .section-medium {
    min-height: auto;
  }

  h1 {
    font-size: clamp(2.75rem, 15vw, 4.5rem);
  }

  h2 {
    font-size: clamp(1.9rem, 10vw, 3rem);
  }

  .document-cover {
    display: block;
  }

  .cover-note {
    margin-top: 2rem;
  }

  .document-index {
    display: block;
    margin-top: 2.5rem;
    counter-reset: document-mobile;
  }

  .document-index li,
  .document-index li:nth-child(3n + 2),
  .document-index li:nth-child(3n + 3) {
    min-height: 0;
    padding: 1rem 0 1rem 3rem;
    border-left: 0;
    counter-increment: document-mobile;
  }

  .document-index li::before {
    position: absolute;
    margin-left: -3rem;
    content: "0" counter(document-mobile);
  }

  .document-metadata {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 1rem;
  }

  .metadata-item {
    display: block;
  }

  .metadata-label {
    display: block;
    margin-top: 0.35rem;
  }

  .quick-access-layout {
    display: block;
  }

  .quick-links {
    display: grid;
    grid-auto-columns: minmax(75%, 1fr);
    grid-auto-flow: column;
    grid-template-columns: none;
    margin-top: 2rem;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: thin;
  }

  .quick-link,
  .quick-link:nth-child(3),
  .quick-link:last-child {
    border-right: 1px solid var(--border-color);
    scroll-snap-align: start;
  }

  .hero-layout {
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .hero-copy,
  .hero-actions {
    display: contents;
  }

  .hero-copy .eyebrow { order: 0; }
  .hero-heading { order: 1; }
  .hero-description { order: 2; }
  .rating-compact { order: 2; }
  .hero-visual { order: 3; margin: 1rem 0; padding: 0.75rem; }
  .hero-actions .cta-primary { order: 4; }
  .hero-actions .cta-secondary { order: 5; }

  .cta-primary,
  .cta-secondary {
    width: 100%;
  }

  .rating-compact {
    width: 100%;
    grid-template-columns: auto auto;
  }

  .rating-count {
    grid-column: 1 / -1;
  }

  .definition-intro,
  .definition-grid {
    grid-template-columns: 1fr;
  }

  .definition-grid > div,
  .definition-grid > div:nth-child(even) {
    padding: 1.2rem 0;
    border-left: 0;
  }

  .navigation-section::before {
    top: 2rem;
    right: 1rem;
    font-size: 6rem;
  }

  .anchor-menu {
    display: grid;
    grid-auto-columns: minmax(76%, 1fr);
    grid-auto-flow: column;
    grid-template-columns: none;
    grid-template-rows: repeat(2, auto);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
  }

  .anchor-item {
    min-height: 9rem;
    scroll-snap-align: start;
  }

  .stepper::before {
    left: 1.1rem;
  }

  .step-row {
    display: grid;
    grid-template-columns: 3rem 1fr;
    min-height: 0;
    padding-bottom: 2.3rem;
  }

  .step-number,
  .step-row:nth-child(odd) .step-number,
  .step-row:nth-child(even) .step-number {
    grid-column: 1;
  }

  .step-copy,
  .step-row:nth-child(odd) .step-copy,
  .step-row:nth-child(even) .step-copy {
    grid-column: 2;
    justify-self: stretch;
    max-width: none;
    padding: 0.2rem 0 1.2rem;
  }

  .faq-layout {
    display: block;
  }

  .faq-aside {
    position: static;
    margin-bottom: 2rem;
  }

  .faq-item summary {
    font-size: 1.03rem;
  }

  .legal-callouts {
    grid-template-columns: 1fr;
  }

  .legal-callout,
  .legal-callout:nth-child(even) {
    min-height: 0;
    padding: 1.2rem 0;
    border-right: 0;
  }

  .footer-lead,
  .footer-directory,
  .footer-meta {
    grid-template-columns: 1fr;
  }

  .footer-lead {
    display: grid;
  }

  .footer-directory {
    display: grid;
  }

  .footer-meta {
    display: grid;
  }

  .inner-main {
    padding-right: 1.25rem;
    padding-left: 1.25rem;
  }

  .inner-header,
  .document-body {
    grid-template-columns: 1fr;
  }

  .inner-header {
    gap: 2rem;
  }

  .inner-summary {
    max-width: 34rem;
  }

  .chapter-nav {
    position: static;
  }

  .route-link {
    grid-template-columns: 2rem 1fr;
  }

  .route-link::after {
    display: none;
  }

  .demo-form {
    padding: 1.25rem;
  }

  .review-summary,
  .review-entry {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 430px) {
  .mobile-index nav,
  .document-metadata {
    grid-template-columns: 1fr;
  }

  .quick-links {
    grid-auto-columns: minmax(88%, 1fr);
  }
}