@media (max-width: 1080px) {
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .evolution-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .hero-layout,
  .interface-grid,
  .contact-shell,
  .value-arc,
  .geo-signal__layout,
  .strata-break__layout,
  .manifesto-hero,
  .manifesto-interlude__layout {
    grid-template-columns: 1fr;
  }

  .manifesto-layout {
    grid-template-columns: minmax(190px, 0.34fr) minmax(0, 1fr);
  }

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

  .geo-signal__track {
    min-height: 150vh;
  }

  .hero-panel {
    min-height: 560px;
  }

  .hero-panel__video {
    min-height: 200px;
  }

  #hero .hero-content-card {
    grid-template-columns: 1fr;
  }

  .hero-panel__label p {
    font-size: 0.86rem;
  }

  .story-layout {
    grid-template-columns: minmax(0, 0.36fr) minmax(0, 0.64fr);
  }

  .geo-frame {
    width: min(100%, 560px);
  }

  .particle-object--hero-core {
    width: min(48vw, 420px);
    height: min(48vw, 420px);
  }

  .particle-object--systems,
  .particle-object--benchmarks,
  .particle-object--manifesto {
    width: min(34vw, 300px);
    height: min(34vw, 300px);
  }
}

@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: calc(100% + 0.5rem);
    border: 1px dashed var(--color-line-dark);
    border-radius: var(--radius-md);
    background: #110d0a;
    display: grid;
    padding: 0.65rem;
    transform: translateY(-0.7rem);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-med) var(--easing-base), transform var(--duration-med) var(--easing-base);
  }

  .nav-links .btn {
    width: 100%;
  }

  .site-header--light .nav-links {
    background: #f2ece2;
    border-color: var(--color-line-light);
  }

  .nav-links.is-open {
    transform: none;
    opacity: 1;
    pointer-events: auto;
  }

  .grid-2,
  .grid-3,
  .grid-4,
  .why-now-grid,
  .constellation,
  .problem-strata {
    grid-template-columns: 1fr;
  }

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

  .manifesto-toc {
    display: none;
  }

  .problem-strata h3,
  .problem-strata p {
    padding: 0.86rem;
    border-right: none;
  }

  .story-layout {
    grid-template-columns: 1fr;
    gap: 0.9rem;
  }

  .story-intro {
    position: static;
  }

  .story-track {
    gap: 0.7rem;
  }

  .story-track::before {
    left: 0.85rem;
  }

  .story-chapter {
    padding-left: 2rem;
  }

  .story-chapter::before {
    left: 0.58rem;
  }

  .strata-break__layout {
    gap: 0.9rem;
  }

  .tab-panel__layout {
    grid-template-columns: 1fr;
  }

  .geo-signal__track {
    min-height: auto;
  }

  .geo-signal__layout {
    position: relative;
    top: auto;
    min-height: auto;
    padding-bottom: 1rem;
  }

  .tab-panel__media {
    min-height: 200px;
  }

  .strata-break__image,
  .manifesto-hero__image,
  .manifesto-interlude__image {
    min-height: 260px;
  }

  .particle-object--story,
  .particle-object--systems,
  .particle-object--benchmarks,
  .particle-object--manifesto {
    opacity: 1;
  }

  .ledger-row {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

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

  .evolution-step::after {
    display: none;
  }

  .section {
    padding: 3.8rem 0;
  }

  .page-hero {
    padding-top: 3.7rem;
    padding-bottom: 1.7rem;
  }

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

  .footer-legal {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
  }
}

@media (max-width: 620px) {
  .nav-wrap,
  .container {
    width: min(100% - 1.4rem, var(--container-max));
  }

  .hero {
    padding-top: 3.4rem;
    padding-bottom: 3.2rem;
  }

  .hero-orbit {
    inset: 8% 6% auto;
    min-height: 118px;
  }

  .hero-panel {
    min-height: 272px;
    padding: 0.9rem;
  }

  .hero-panel__label {
    padding: 0.55rem;
  }

  .btn {
    width: 100%;
  }

  .btn-row {
    width: 100%;
  }

  .hero-meta {
    display: grid;
    grid-template-columns: 1fr;
  }

  .hero-orbit {
    display: none;
  }

  .particle-field {
    opacity: 1;
  }

  .particle-object {
    display: none;
  }

  .geo-frame,
  .strata-break__image,
  .manifesto-hero__image,
  .manifesto-interlude__image {
    min-height: 220px;
  }

  .story-track::before {
    left: 0.72rem;
  }

  .story-chapter {
    grid-template-columns: 1fr;
    padding-left: 1.7rem;
    gap: 0.42rem;
  }

  .story-chapter::before {
    left: 0.44rem;
    top: 1rem;
  }

  .story-chapter__index {
    min-width: 1.8rem;
    height: 1.8rem;
    font-size: 0.74rem;
  }

  .story-chapter__body {
    padding: 0.8rem 0.85rem;
  }

  .story-chapter h3 {
    font-size: clamp(0.98rem, 4.2vw, 1.18rem);
  }

  .manifesto-content h2 {
    font-size: clamp(1.3rem, 7vw, 1.7rem);
  }

  .manifesto-content p {
    font-size: 0.95rem;
    line-height: 1.74;
    text-align: justify;
    text-justify: inter-word;
  }

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