@media (max-width: 960px) {
  .site-sidebar {
    position: sticky;
    z-index: 300;
    top: 0;
    display: block;
    width: 100%;
    padding: 0.8rem 1rem;
  }

  .sidebar-heading {
    display: flex;
    padding: 0;
    align-items: center;
    justify-content: space-between;
    border: 0;
  }

  .site-sidebar .brand-name {
    font-size: 1.2rem;
  }

  .sidebar-contact {
    display: none;
  }

  .site-content {
    margin-left: 0;
  }

  .proposal-site .site-nav {
    margin: 0;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    padding: 1rem 1.5rem 1.4rem;
    flex-direction: column;
    align-items: stretch;
    background: var(--deep-2);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
  }

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

  .site-nav a {
    padding: 0.65rem;
    text-align: center;
  }

  .decision-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .decision-grid > div,
  .decision-grid > div:first-child {
    min-height: 6.25rem;
    border: 0;
    border-right: 1px solid rgba(255, 255, 255, 0.14);
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

  .opening-grid,
  .basis-layout,
  .evidence-grid,
  .terms-grid {
    grid-template-columns: 1fr;
  }

  .program-grid,
  .constraint-grid,
  .role-grid,
  .option-grid,
  .split-matrix,
  .climate-layout,
  .access-shell {
    grid-template-columns: 1fr;
  }

  .constraint-card,
  .constraint-card:first-child,
  .role-grid article,
  .role-grid article:first-child,
  .split-matrix article {
    border: 0;
    border-bottom: 1px solid var(--line);
  }

  .role-grid article,
  .role-grid article:first-child {
    border-color: rgba(255, 255, 255, 0.17);
  }

  .system-scope {
    grid-template-columns: 1fr;
  }

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

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

  .evidence-copy {
    position: static;
  }

  .service-grid,
  .library-grid {
    grid-template-columns: 1fr;
  }

  .service-card {
    min-height: 0;
  }

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

  .milestone-list li,
  .milestone-list li:first-child {
    display: grid;
    padding: 1.25rem 0;
    grid-template-columns: auto 1fr;
    gap: 1rem;
    border: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.17);
    background: transparent;
  }

  .milestone-list span {
    margin: 0;
  }
}

@media (max-width: 700px) {
  :root {
    --shell: min(100% - 2rem, 1120px);
  }

  body {
    font-size: 16px;
  }

  .nav-shell {
    min-height: 4.5rem;
  }

  .hero {
    min-height: 690px;
  }

  .hero h1 {
    font-size: clamp(2.7rem, 13vw, 4.4rem);
  }

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

  .hero-caption {
    display: none;
  }

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

  .decision-grid > div {
    padding: 1.1rem;
  }

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

  .acceptance-gate {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

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

  .basis-facts > p {
    grid-column: 1 / -1;
  }

  .site-footer .page-shell {
    flex-direction: column;
  }

  .proposal-stage {
    padding: 1rem;
  }

  .proposal-cover,
  .proposal-body {
    padding: 1.4rem;
  }

  .document-meta > div {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .document-actions,
  .document-actions .button {
    width: 100%;
  }

  .proposal-body {
    overflow-x: auto;
  }

  .support-intro {
    min-height: 620px;
  }

  .support-intro-copy {
    padding: 2rem;
  }

  .precedent-grid,
  .drawing-pair,
  .delivery-flow,
  .library-section .library-grid {
    grid-template-columns: 1fr;
  }

  .access-shell {
    width: min(100% - 2rem, 1120px);
    padding-block: 1rem;
  }
}

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

@media print {
  .site-sidebar,
  .support-intro,
  .site-content > section:not(.proposal-stage),
  .site-footer,
  .document-actions {
    display: none !important;
  }

  .site-content {
    margin: 0;
  }

  .proposal-stage {
    padding: 0;
  }

  .proposal-paper {
    max-width: none;
    border: 0;
    box-shadow: none;
  }

  .site-header,
  .hero-actions {
    display: none;
  }

  .hero {
    min-height: auto;
    color: var(--ink);
  }

  .hero-image,
  .hero-shade,
  .hero-caption {
    display: none;
  }

  .hero-content {
    padding-block: 2rem;
  }

  .hero h1,
  .hero-lead {
    color: var(--ink);
  }

  .section,
  .authorization {
    padding-block: 2rem;
  }
}