/* Open page composition. Narrow screens switch between copy and art. */
.page-shell {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100svh;
  padding: 32px 20px;
}

.page-shell .header {
  flex: none;
  margin: 0 0 clamp(28px, 6svh, 60px);
}

.page-shell .columns {
  display: grid;
  flex: none;
  width: 100%;
}

/* Both copies share one grid cell, preserving the header and navigation position.
   The inactive copy is invisible, unfocusable, and absent from the accessibility tree. */
.page-copy {
  grid-area: 1 / 1;
  align-self: start;
  width: 100%;
  min-width: 0;
}

.page-copy[hidden] { display: block; visibility: hidden; }
.page-title:focus { outline: none; }

.site-nav {
  display: flex;
  flex: none;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
  font: 12px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 36px;
  padding: 6px 12px;
  color: var(--dim);
  text-decoration: none;
}

.site-nav a:hover { color: var(--accent-fg); }
.site-nav a[aria-current="page"] {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--accent-fg);
  text-underline-offset: 7px;
  text-decoration-thickness: 1px;
}
.site-nav a:focus-visible { outline: 2px solid var(--accent-fg); outline-offset: 3px; }

@media (max-width: 1199px) {
  .page-shell { padding: 72px 20px 20px; }
  .page-shell .header { margin: 0 0 28px; }
  .page-shell .header .logo { width: min(300px, 72vw); }
  .page-shell .header b { font-size: 13px; }
  .page-shell .scene-views:not([hidden]) { margin-top: 16px; }
  .page-shell .mobile-scene-space { display: none; margin-top: 12px; }

  :root[data-scene-view="terminal"] .page-shell .mobile-scene-space,
  :root[data-scene-view="schematic"] .page-shell .mobile-scene-space {
    display: block;
  }

  :root[data-scene-view="terminal"] .page-shell .columns,
  :root[data-scene-view="schematic"] .page-shell .columns {
    display: none;
  }

  .page-shell .site-nav { margin-top: 20px; }
}

@media (max-width: 1199px) and (max-height: 740px) {
  .page-shell { padding-top: 66px; padding-bottom: 14px; }
  .page-shell .header { margin-bottom: 20px; }
  .page-shell .header .logo { width: min(240px, 64vw); }
  .page-shell .header .logo-wrap { margin-bottom: 6px; }
  .page-shell .scene-views:not([hidden]) { margin-top: 12px; }
  .page-shell .scene-views button { min-height: 32px; padding-block: 6px; }
  .page-title { margin-bottom: 16px; }
  .page-shell .site-nav { margin-top: 12px; }
}

@media (max-width: 480px) {
  .page-title { font-size: 25px; }
  .page-intro { font-size: 16px; line-height: 1.6; }
  .page-detail { font-size: 14px; line-height: 1.7; }
}

@media (max-width: 480px) and (max-height: 740px) {
  .page-shell { font-size: 14px; line-height: 1.55; padding-bottom: 10px; }
  .page-shell .header { margin-bottom: 20px; }
  .page-shell .header .logo { width: min(200px, 60vw); }
  .page-title { font-size: 22px; margin-bottom: 14px; }
  .page-intro { font-size: 14px; line-height: 1.6; }
  .page-detail { font-size: 14px; line-height: 1.6; }
  .page-copy p + p { margin-top: 16px; }
  .contact-link { font-size: 16px; }
  .page-shell .site-nav { margin-top: 10px; }
}

.engineering-terminal[data-compact="true"] .terminal-header { flex-basis: 48px; }
.engineering-terminal[data-compact="true"] .terminal-robot { width: 43px; height: 43px; }
.engineering-terminal[data-compact="true"] .terminal-tab { flex-basis: 29px; }
.engineering-terminal[data-compact="true"] .terminal-viewport { margin-block: 8px; }

@media print {
  .page-shell { display: block; min-height: 0; padding: 20px; }
  .page-shell .header { margin: 0 0 24px; }
  .page-shell .columns { display: block !important; }
  .page-copy[hidden] { display: none; }
}