@media (max-width: 1280px) {
  .archive-hero__copy {
    max-width: 38rem;
  }

  .archive-hero__copy h1 {
    max-width: 12ch;
  }

  .timeline-rail {
    left: 0.85rem;
    padding: 0.8rem 0.55rem;
  }

  .timeline-item {
    min-width: 6.2rem;
    padding: 0.55rem 0.55rem 0.62rem 0.85rem;
  }

  .organism-core {
    width: min(30rem, 82vw);
  }

  .shell-grid {
    gap: 0.85rem;
  }

  .protocol-grid,
  .contact-panel,
  .node-grid {
    gap: 0.85rem;
  }
}

@media (max-width: 1100px) {
  .archive-hero .chapter-shell {
    gap: 2.25rem;
  }

  .archive-hero__copy {
    max-width: 100%;
  }

  .archive-hero__copy h1 {
    max-width: 11ch;
  }

  .archive-hero__visual {
    order: -1;
  }

  .organism-core {
    width: min(26rem, 88vw);
  }

  .organism-core__shell--outer {
    inset: 6%;
  }

  .organism-core__shell--mid {
    inset: 18%;
  }

  .organism-core__shell--inner {
    inset: 30%;
  }

  .shell-note {
    min-height: auto;
  }

  .world-rift {
    gap: 1rem;
  }

  .rift-text {
    grid-template-columns: 1fr 1fr;
  }

  .timeline-rail {
    display: none;
  }
}

@media (max-width: 900px) {
  .archive-hero {
    padding-bottom: 4rem;
  }

  .archive-signal-strip {
    margin-top: var(--space-6);
  }

  .archive-signal-strip span {
    padding: 0.6rem 0.82rem;
    font-size: 0.72rem;
  }

  .section-heading,
  .world-intro {
    gap: 0.7rem;
  }

  .section-heading p,
  .world-intro p,
  .archive-hero__copy .hero-text {
    max-width: 100%;
  }

  .rift-visual {
    min-height: 20rem;
  }

  .protocol-card,
  .archive-card,
  .note-card,
  .node-card,
  .shell-note,
  .rift-text article,
  .contact-panel__meta,
  .terminal-band {
    border-radius: 1.2rem;
  }
}

@media (max-width: 720px) {
  body {
    overflow-x: hidden;
  }

  .site-header {
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
  }

  .brand-mark {
    gap: 0.75rem;
  }

  .archive-brand__symbol,
  .brand-mark__symbol {
    width: 2.3rem;
    height: 2.3rem;
  }

  .brand-mark__text strong {
    font-size: 0.88rem;
  }

  .brand-mark__text small {
    font-size: 0.66rem;
  }

  .header-actions {
    gap: 0.5rem;
  }

  .theme-toggle,
  .menu-toggle {
    width: 2.65rem;
    height: 2.65rem;
  }

  .archive-hero {
    padding-top: calc(var(--header-height) + 1rem);
    padding-bottom: 3.4rem;
  }

  .archive-hero .chapter-shell {
    gap: 1.6rem;
  }

  .archive-hero__copy h1 {
    max-width: none;
  }

  .archive-hero__copy .hero-text {
    margin-top: var(--space-5);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    margin-top: var(--space-6);
  }

  .archive-signal-strip {
    gap: 0.55rem;
  }

  .archive-signal-strip span {
    width: 100%;
    justify-content: center;
    text-align: center;
  }

  .organism-core {
    width: min(21rem, 92vw);
  }

  .organism-core__halo {
    inset: 12%;
  }

  .organism-core__spine {
    width: 0.72rem;
    height: 62%;
  }

  .shell-grid,
  .protocol-grid,
  .node-grid,
  .contact-panel,
  .rift-text {
    grid-template-columns: 1fr;
  }

  .world-rift {
    gap: 0.9rem;
  }

  .rift-visual {
    min-height: 16rem;
    border-radius: 1.2rem;
  }

  .shell-note,
  .protocol-card,
  .archive-card,
  .node-card,
  .note-card,
  .rift-text article,
  .contact-panel__meta {
    padding: 1.1rem 1rem 1.15rem;
  }

  .terminal-band {
    padding: 1.15rem 1rem 1.2rem;
  }

  .footer-inner {
    font-size: 0.76rem;
  }
}

@media (max-width: 560px) {
  .header-inner {
    gap: 0.6rem;
  }

  .brand-mark__text small {
    max-width: 12ch;
    line-height: 1.25;
  }

  .mobile-nav {
    padding: 0.9rem 1rem 1.1rem;
  }

  .mobile-nav a {
    padding: 0.8rem 0;
  }

  .chapter {
    padding-block: clamp(3.4rem, 10vw, 4.4rem);
  }

  .archive-shell,
  .chapter-shell,
  .footer-inner {
    width: min(calc(100% - 0.85rem), 100%);
  }

  .archive-shell {
    padding: 0.85rem;
  }

  .section-heading h2,
  .world-intro h2 {
    font-size: clamp(1.9rem, 7vw, 2.5rem);
  }

  .eyebrow {
    font-size: 0.68rem;
    letter-spacing: 0.16em;
  }

  .button {
    min-height: 3rem;
    padding: 0.9rem 1rem;
    font-size: 0.76rem;
    letter-spacing: 0.12em;
  }

  .organism-core {
    width: min(18.5rem, 94vw);
  }

  .rift-visual {
    min-height: 14rem;
  }

  .archive-signal-strip span {
    font-size: 0.68rem;
  }

  .timeline-item__label,
  .timeline-item__index {
    letter-spacing: 0.1em;
  }
}

@media (max-width: 420px) {
  .brand-mark {
    min-width: 0;
  }

  .brand-mark__text strong {
    font-size: 0.82rem;
  }

  .brand-mark__text small {
    font-size: 0.62rem;
  }

  .theme-toggle,
  .menu-toggle {
    width: 2.45rem;
    height: 2.45rem;
  }

  .archive-hero__copy .hero-text,
  .section-heading p,
  .world-intro p,
  .note-card p,
  .archive-card p,
  .protocol-card p,
  .node-card p,
  .shell-note p,
  .rift-text p,
  .contact-panel__meta p {
    font-size: 0.94rem;
  }

  .shell-note,
  .protocol-card,
  .archive-card,
  .node-card,
  .rift-text article,
  .contact-panel__meta,
  .terminal-band {
    border-radius: 1rem;
  }
}