/* Match the shared site header while shielding it from standalone tool styles. */
header.site.tool-site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: none;
  min-height: 74px;
  margin: 0;
  padding: 18px 20px;
  gap: 10px;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.94);
  color: var(--ink);
  font-family: 'Work Sans', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: normal;
  text-transform: none;
  backdrop-filter: blur(8px);
}
html[data-theme="dark"] header.site.tool-site-header { background: rgba(11,18,32,.94); }
.tool-site-header > .brand {
  display: flex;
  align-items: center;
  flex: 0 1 auto;
  min-width: 0;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
}
.tool-site-header > .brand img { width: auto; height: 32px; object-fit: contain; }
.tool-site-header > .brand span {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: normal;
  text-transform: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tool-site-header nav.desktop-nav {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: 'Work Sans', Arial, sans-serif;
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
}
.tool-site-header nav.desktop-nav a {
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  color: var(--ink);
  letter-spacing: normal;
  text-decoration: none;
  text-transform: none;
}
.tool-site-header nav.desktop-nav a:hover,
.tool-site-header nav.desktop-nav a[aria-current="page"] { color: var(--teal-dark); border-bottom-color: var(--teal); }
.tool-site-header > .header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: nowrap;
  flex-shrink: 0;
  gap: 10px;
}
.tool-site-header .account-menu-btn { line-height: normal; }
header.tool-site-header .header-cta {
  display: inline-block;
  flex-shrink: 0;
  min-height: 0;
  margin: 0;
  padding: 9px 15px;
  border: none;
  border-radius: 6px;
  background: var(--teal);
  color: #fff;
  font-family: 'Work Sans', Arial, sans-serif;
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: normal;
  text-decoration: none;
  text-transform: none;
  white-space: nowrap;
}
header.tool-site-header .header-cta:hover { background: var(--teal-dark); color: #fff; }
.tool-site-header label.mobile-menu-btn { display: none; }
.tool-site-header + nav.mobile-nav {
  font-family: 'Work Sans', Arial, sans-serif;
  line-height: 1.5;
  letter-spacing: normal;
  text-transform: none;
}
.grade-spec-tool-page .top-shell,
.grade-spec-guide-page .topbar { top: 74px; }
/* Keep the compact site navigation clear of the right-hand controls. */
@media (max-width: 1279px) {
  .tool-site-header nav.desktop-nav { display: none; }
  .tool-site-header label.mobile-menu-btn { display: flex; }
  .mnav-check:checked ~ header.tool-site-header + nav.mobile-nav { display: flex; }
}
@media (max-width: 760px) {
  header.site.tool-site-header { min-height: 65px; padding: 14px 16px; }
  header.tool-site-header .header-cta { display: none; }
  .grade-spec-tool-page .top-shell,
  .grade-spec-guide-page .topbar { top: 65px; }
}
@media (max-width: 640px) { .tool-site-header > .brand span { font-size: 15px; } }
@media (max-width: 560px) { .tool-site-header > .brand span { display: none; } }
@media print {
  header.site.tool-site-header, .tool-site-header + nav.mobile-nav { display: none !important; }
  .grade-spec-tool-page .top-shell, .grade-spec-guide-page .topbar { top: 0; }
}