/* Shared fixed shell for the Japanese and European editions. */
@media screen {
  .layout > aside > .sidebar-mode-tabs,
  .layout > aside > .edition-tabs,
  .layout > aside > .unit-edition-tabs,
  .layout > aside > .gd-global-learning-nav,
  .page-layout > .sidebar > .primary-nav,
  .gd-fixed-shell > aside > .primary-nav,
  .gd-fixed-shell > aside > .gd-global-learning-nav {
    position: sticky !important;
    top: 0 !important;
    z-index: 60;
    background-color: #f5f9f6 !important;
  }
}
body > header {
  position: sticky !important;
  top: 0 !important;
  z-index: 100 !important;
  background-color: #fff !important;
  overflow: visible !important;
}
html[lang^="ja"] body > header .gd-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: #176e5c;
  text-decoration: none;
}
html[lang^="ja"] body > header .gd-brand img { display: block; width: 52px; height: 52px; }
html[lang^="ja"] body > header .gd-brand-copy { display: flex; flex-direction: column; gap: 4px; }
html[lang^="ja"] body > header .gd-brand-name {
  font: 900 26px/1.1 "Arial Rounded MT Bold", "Trebuchet MS", Arial, sans-serif;
  letter-spacing: -1.5px;
}
html[lang^="ja"] body > header .gd-brand-name > span { color: #ed764b; font-size: 29px; margin-left: 1px; }
html[lang^="ja"] body > header .gd-brand-copy small { color: #61786f; font-size: 10px; font-weight: 600; letter-spacing: .5px; }
.gd-global-learning-nav {
  box-sizing: border-box !important;
  display: grid !important;
  grid-template-columns: minmax(0, 1fr) !important;
  gap: 8px !important;
  width: 100% !important;
  margin: 0 0 16px !important;
  padding: 0 !important;
}
.gd-global-learning-nav > a {
  box-sizing: border-box !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 100% !important;
  min-height: 46px !important;
  margin: 0 !important;
  padding: 8px 10px !important;
  border: 1px solid #c5ddd4 !important;
  border-radius: 9px !important;
  background: #fff !important;
  color: #286b5b !important;
  font: 700 14px/1.25 Arial, "Noto Sans JP", Meiryo, sans-serif !important;
  text-align: center !important;
  text-decoration: none !important;
  white-space: normal !important;
}
.gd-global-learning-nav > a[aria-current="page"] {
  border-color: #176e5c !important;
  background: #176e5c !important;
  color: #fff !important;
}
.gd-global-learning-nav-inline {
  display: flex !important;
  flex-flow: row wrap !important;
  gap: 8px !important;
  width: auto !important;
  margin: 10px 14px !important;
}
.gd-global-learning-nav-inline > a { width: auto !important; flex: 1 1 150px !important; }
@media screen {
  html { height: 100%; overflow: clip; }
  body {
    position: fixed !important;
    inset: 0 !important;
    width: 100% !important;
    height: 100vh !important;
    height: 100dvh !important;
    display: flex !important;
    flex-direction: column !important;
    overflow: clip !important;
  }
  body > header { position: relative !important; top: auto !important; flex: 0 0 auto !important; }
  body > .layout, body > main.layout, body > .page-layout, body > .gd-fixed-shell {
    flex: 1 1 0% !important;
    width: 100% !important;
    min-height: 0 !important;
    margin-top: 0 !important;
    margin-bottom: 0 !important;
    grid-template-rows: minmax(0,1fr) !important;
    overflow: clip !important;
  }
  .layout > aside, .page-layout > .sidebar {
    position: static !important;
    top: auto !important;
    align-self: stretch !important;
    min-height: 0 !important;
    max-height: 100% !important;
    overflow-y: auto !important;
    overscroll-behavior: contain;
    scrollbar-gutter: stable;
  }
  .layout > :not(aside):not(.sidebar), .page-layout > :not(aside):not(.sidebar) {
    min-height: 0 !important;
    height: 100% !important;
    overflow-y: auto !important;
    overscroll-behavior: contain;
    scrollbar-gutter: stable;
  }
  .gd-fixed-shell {
    display: grid !important;
    grid-template-columns: 220px minmax(0,1fr) !important;
    gap: 24px !important;
    padding: 16px 28px !important;
  }
  .gd-fixed-shell > aside { min-height: 0 !important; overflow-y: auto !important; overscroll-behavior: contain; }
  .gd-fixed-shell > main, .gd-fixed-shell > article, .gd-fixed-shell > .page-content {
    min-width: 0 !important;
    min-height: 0 !important;
    height: 100% !important;
    overflow-y: auto !important;
    overscroll-behavior: contain;
  }
  body > main:not(.layout):not(.page-layout), body > article {
    flex: 1 1 0% !important;
    min-height: 0 !important;
    overflow-y: auto !important;
  }
  body > footer { flex: 0 0 auto !important; }
}
@media screen and (max-width: 767px) {
  /* Unit tools live beside the worksheet; keep the compact header above its menus. */
  body:has(> main#learning) > header > .top-nav,
  body:has(> main#learning) > header > .preview-tag { display: none !important; }
  body:has(> main#learning) > header { flex-wrap: nowrap !important; }
  .gd-global-learning-nav { gap: 6px !important; margin-bottom: 10px !important; }
  .gd-global-learning-nav > a { min-height: 40px !important; }
  /* Page styles often switch these fixed shells to block on phones while
     leaving the two-row grid tracks in place. Restore the intended shell. */
  body > .layout, body > main.layout, body > .page-layout, body > .gd-fixed-shell {
    display: grid !important;
    grid-template-columns: minmax(0,1fr) !important;
    grid-template-rows: minmax(0,28dvh) minmax(0,1fr) !important;
    gap: 10px !important;
    padding-top: 10px !important;
    padding-bottom: 10px !important;
  }
  body > .layout > .preview, body > main.layout > .preview,
  body > .layout > .content, body > main.layout > .content,
  body > .page-layout > .content, body > .gd-fixed-shell > main {
    margin-top: 0 !important;
  }
  .layout > aside, .page-layout > .sidebar { max-height: 28dvh !important; }
  .gd-fixed-shell { grid-template-columns: minmax(0,1fr) !important; grid-template-rows: minmax(0,28dvh) minmax(0,1fr) !important; gap: 10px !important; padding: 10px 14px !important; }
  .gd-fixed-shell > aside { max-height: 28dvh !important; }
  body > header { max-height: 92px !important; padding-top: 8px !important; padding-bottom: 8px !important; }
  html[lang^="ja"] body > header .gd-brand img { width: 44px; height: 44px; }
  html[lang^="ja"] body > header .gd-brand-name { font-size: 24px; }
  html[lang^="ja"] body > header .gd-brand-copy small { font-size: 9px; }
}
@media screen {
  body > main.layout#learning > .preview { scroll-padding-block-end: 2px !important; }
}
@media print {
  html, body { height: auto !important; overflow: visible !important; }
  body { position: static !important; inset: auto !important; display: block !important; }
  body > header { position: static !important; }
  body > .layout, body > main.layout, body > .page-layout, body > .gd-fixed-shell { overflow: visible !important; }
  .layout > aside, .layout > :not(aside):not(.sidebar), .page-layout > .sidebar, .page-layout > :not(aside):not(.sidebar) { overflow: visible !important; height: auto !important; max-height: none !important; }
  .gd-global-learning-nav { display: none !important; }
  .gd-fixed-shell { display: block !important; }
}
@page { size: A4; }
@media print {
  body > header, body > footer, .sidebar-mode-tabs, .edition-tabs,
  .unit-edition-tabs, .gd-landing-links, .layout > aside,
  .page-layout > .sidebar, .gd-fixed-shell > aside { display: none !important; }
  body.printing-bundle > .gd-fixed-shell { display: none !important; }
  .gd-fixed-shell, .gd-fixed-shell > main, .gd-fixed-shell > section {
    height: auto !important; min-height: 0 !important; overflow: visible !important;
    margin: 0 !important; padding: 0 !important;
  }
}