body {
  margin: 0;
}

.global-course-header {
  color-scheme: light dark;
  --gch-panel: light-dark(#ffffff, #111a1f);
  --gch-panel-soft: light-dark(#edf3f0, #1a292e);
  --gch-ink: light-dark(#17292d, #edf6f3);
  --gch-muted: light-dark(#587075, #a9bdba);
  --gch-line: light-dark(#cedbd7, #34484b);
  --gch-brand: light-dark(#087866, #73dcc6);
  --gch-brand-ink: light-dark(#ffffff, #07110f);
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  color: var(--gch-ink);
  background: color-mix(in srgb, var(--gch-panel) 96%, transparent);
  border-bottom: 1px solid var(--gch-line);
  box-shadow: 0 4px 18px light-dark(rgba(23, 41, 45, .06), rgba(0, 0, 0, .2));
  backdrop-filter: blur(12px);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", Meiryo, sans-serif;
  line-height: 1.4;
}

.global-course-header *,
.global-course-header *::before,
.global-course-header *::after { box-sizing: border-box; }

.global-course-header-inner {
  display: grid;
  grid-template-columns: 126px minmax(155px, auto) minmax(0, 1fr);
  align-items: center;
  gap: 18px;
  width: 100%;
  max-width: 1440px;
  min-height: 72px;
  margin: 0 auto;
  padding: 10px clamp(16px, 3vw, 32px);
}

.global-course-logo-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 126px;
  height: 40px;
  padding: 4px 7px;
  background: transparent;
  border-radius: 6px;
  text-decoration: none;
}

.global-course-logo-link:hover,
.global-course-logo-link:focus-visible {
  background: var(--gch-panel-soft);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--gch-brand) 55%, transparent);
  outline: 0;
}

.global-course-logo {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: 100%;
}

.global-course-name {
  display: grid;
  gap: 2px;
  min-width: 0;
  color: var(--gch-ink);
  text-decoration: none;
  white-space: nowrap;
}

.global-course-name strong { font-size: 15px; font-weight: 700; letter-spacing: .02em; }
.global-course-name span { color: var(--gch-muted); font-size: 11px; }
.global-course-name:hover strong,
.global-course-name:focus-visible strong { color: var(--gch-brand); }

.global-course-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  min-width: 0;
  overflow-x: auto;
  padding: 2px;
  scrollbar-width: thin;
}

.global-course-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 7px 9px;
  color: var(--gch-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 7px;
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.global-course-nav a:hover,
.global-course-nav a:focus-visible {
  color: var(--gch-ink);
  background: var(--gch-panel-soft);
  border-color: var(--gch-line);
  outline: 0;
}

.global-course-nav a[aria-current="page"] {
  color: var(--gch-brand-ink);
  background: var(--gch-brand);
  border-color: var(--gch-brand);
}

.global-course-skip {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  padding: 8px 12px;
  color: var(--gch-brand-ink, #fff);
  background: var(--gch-brand, #087866);
  border-radius: 7px;
  transform: translateY(-160%);
}

.global-course-skip:focus { transform: none; }

.term-tooltip {
  position: fixed;
  z-index: 2000;
  display: none;
  width: max-content;
  max-width: min(360px, calc(100vw - 24px));
  padding: 11px 13px;
  color: #ffffff;
  background: #173b36;
  border: 1px solid #4f8e83;
  border-radius: 8px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, .28);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", Meiryo, sans-serif;
  font-size: 13px;
  font-weight: 400;
  line-height: 1.55;
  overflow-wrap: anywhere;
  pointer-events: none;
}

.term-tooltip.is-visible { display: block; }

@media (prefers-color-scheme: dark) {
  .term-tooltip {
    color: #07110f;
    background: #d9f6ee;
    border-color: #73dcc6;
  }
}

@media (max-width: 1080px) {
  .global-course-header-inner {
    grid-template-columns: 126px minmax(0, 1fr);
    gap: 6px 18px;
    padding-bottom: 7px;
  }
  .global-course-nav {
    grid-column: 1 / -1;
    justify-content: flex-start;
    padding-top: 5px;
    border-top: 1px solid var(--gch-line);
  }
}

@media (max-width: 560px) {
  .global-course-header-inner { grid-template-columns: 108px minmax(0, 1fr); padding-inline: 12px; }
  .global-course-logo-link { width: 108px; height: 36px; padding-left: 2px; }
  .global-course-name strong { font-size: 14px; }
  .global-course-name span { display: none; }
  .global-course-nav a { min-height: 34px; padding: 6px 8px; font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  .global-course-header { backdrop-filter: none; }
}