/* Mobile composition: normal document flow, separated artwork, native navigation. */
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
.authority-icon { width: 30px; height: 30px; flex: none; stroke: #89dce9; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.mobile-menu { display: none; }
@media (max-width: 780px) {
  body { padding-inline: env(safe-area-inset-left) env(safe-area-inset-right); }
  .nav-shell { position: relative; top: auto; padding-top: max(16px, env(safe-area-inset-top)); }
  .navigation { position: relative; width: calc(100% - 32px); padding: 12px 14px; gap: 12px; }
  .navigation .wordmark { font-size: 28px; gap: 8px; white-space: nowrap; }
  .navigation .brand-symbol { width: 30px; height: 30px; }
  .navigation > .nav-contact { display: none; }
  .mobile-menu { display: block; margin-left: auto; }
  .mobile-menu summary { min-height: 44px; display: flex; align-items: center; gap: 10px; padding: 8px 12px; border: 1px solid #81d6ee30; border-radius: 12px; color: #d8f3f9; font-size: 13px; cursor: pointer; list-style: none; background: #16334b88; }
  .mobile-menu summary::-webkit-details-marker { display: none; }
  .mobile-menu summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
  .mobile-menu summary svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.4; }
  .mobile-menu[open] summary { background: #24516c; }
  .mobile-menu-panel { position: absolute; top: calc(100% + 10px); left: 0; right: 0; padding: 10px; border: 1px solid #81d6ee30; border-radius: 20px; background: linear-gradient(135deg, #102239, #0b182b); box-shadow: 0 18px 45px #0008; backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px); }
  .mobile-menu-panel a { display: flex; justify-content: space-between; min-height: 48px; padding: 12px 14px; border-radius: 10px; color: #e4f3fa; font-size: 15px; }
  .mobile-menu-panel a:hover, .mobile-menu-panel a:focus-visible { background: #21455e; }
  .hero { padding-top: 42px; min-height: 0; display: block; }
  .hero-copy { pointer-events: auto; }
  .hero .eyebrow { line-height: 1.7; align-items: baseline; }
  h1 { font-size: clamp(40px, 10.8vw, 76px); margin: 22px 0; }
  .hero-description { font-size: 16px; }
  .hero-art { position: relative; top: auto; right: auto; width: 100%; height: clamp(260px, 85vw, 420px); margin: 32px 0 12px; transform: none; opacity: 1; }
  .hero-art .coordinate-top { top: 8px; right: 8px; }
  .hero-art .coordinate-bottom { bottom: 8px; right: 8px; }
  .hero-footer { padding: 20px 0 24px; align-items: flex-start; }
  .hero-footer > span { max-width: 65%; line-height: 1.8; }
  .product-topline { flex-wrap: wrap; gap: 10px; }
  .architecture-heading { flex-wrap: wrap; }
  .venture-card { min-height: 0; padding: 26px; }
  .venture-copy, .next .venture-copy { padding-top: 0; max-width: none; }
  .venture-copy h3 { font-size: clamp(32px, 8vw, 42px); }
  .venture-copy p { font-size: 15px; }
  .hermes-art { position: relative; top: auto; right: auto; width: 220px; height: 170px; margin: 28px auto 20px; transform: none; opacity: .65; pointer-events: none; }
  .hermes-art i { width: 124px; height: 124px; left: 0; top: 0; }
  .hermes-art i:nth-child(2) { left: 30px; top: 10px; }
  .hermes-art i:nth-child(3) { left: 60px; top: 20px; }
  .hermes-art i:nth-child(4) { left: 90px; top: 30px; }
  .next-art { position: relative; top: auto; right: auto; width: 150px; height: 150px; margin: 34px auto 26px; pointer-events: none; }
  .next-art span { font-size: 54px; }
  .next-art i { inset: 35px; }
  .next-art i:nth-of-type(2) { inset: 15px; }
  .next-art i:nth-of-type(3) { inset: 0; }
  .system-visual { min-height: 0; }
  .system-grid { padding: 16px; }
  .system-node, .authority-node { gap: 12px; padding: 15px; }
  .visual-heading { padding: 20px 16px; flex-wrap: wrap; }
  .visual-footer { padding: 16px; }
  input, textarea { font-size: 16px; }
  .text-link { min-height: 44px; align-items: center; }
  footer { padding-bottom: max(24px, env(safe-area-inset-bottom)); }
}
@media (max-width: 360px) {
  .venture-card, .product-copy, .architecture-card, .contact-panel { padding: 22px; }
  .system-visual { margin-inline: 10px; }
  .system-grid { padding: 12px; }
  .system-node, .authority-node { font-size: 12px; gap: 8px; padding: 12px; }
  .mini-node { padding: 12px 8px; }
}