/* Floating navigation: quiet frame, clear course groups. */
.site-header .header-inner{min-height:66px;padding:8px 24px;border:1px solid rgba(16,38,90,.06);border-radius:12px;box-shadow:0 3px 14px rgba(16,38,90,.055);}
.header-inner .brand{width:120px;}
/* Inline SVG keeps the original lettering and avoids external CSS masks,
   which browsers reject when this page is opened directly through file://. */
.header-inner .brand-official{display:block;height:auto;filter:none;}
.header-inner .nav-labels{display:flex;align-items:center;gap:28px;white-space:nowrap;font-size:14px;font-weight:550;}
.site-header a{color:#10265a;text-decoration:none;}
.header-inner .nav-end{gap:18px;}
.header-inner .login-label{border:0;background:transparent;padding:8px 2px;min-height:44px;font-weight:550;}
.header-inner .login-label:hover{color:#006bd6;}
.header-inner .top-cta{min-height:40px;padding:10px 20px;border-radius:8px;color:#fff;}
/* Give text links and disclosure labels the same vertical text alignment. */
.header-inner :is(.nav-labels>a,.nav-dropdown>summary,.nav-end>a){line-height:1.4;}
.header-inner :is(.nav-labels>a,.nav-end>a){display:inline-flex;align-items:center;}
.header-inner .nav-labels>a{min-height:44px;}
.header-inner .nav-end>a{justify-content:center;}
.nav-dropdown{position:relative;}
.nav-dropdown summary{display:flex;align-items:center;gap:8px;min-height:44px;cursor:pointer;list-style:none;user-select:none;}
.nav-dropdown summary::-webkit-details-marker{display:none;}
.nav-chevron{width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg);margin-top:-3px;opacity:.65;}
.nav-dropdown[open]>summary{color:#006bd6;}
.nav-dropdown[open] .nav-chevron{transform:rotate(225deg);margin-top:3px;}
.nav-popover{position:absolute;top:calc(100% + 18px);left:-24px;padding:20px;background:#fff;border:1px solid #e6edf3;border-radius:12px;box-shadow:0 12px 32px rgba(16,38,90,.10);white-space:normal;}
.nav-popover a{display:block;border-radius:6px;padding:12px;font-size:14px;font-weight:550;line-height:1.5;}
.nav-popover a:hover{background:#f0f7fc;color:#0065a6;}
.nav-popover small{display:block;color:#5f7084;font-size:12px;font-weight:400;margin-top:2px;}
.nav-approach-menu{width:320px;padding:12px;}
.nav-course-menu{width:492px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px 20px;}
.nav-course-group+.nav-course-group{border-left:1px solid #e6edf3;padding-left:20px;}
.nav-course-group strong{display:block;margin:0 10px 10px;padding-bottom:12px;border-bottom:2px solid #d9edf9;color:#10265a;font-size:16px;font-weight:650;letter-spacing:-.02em;}
.nav-course-group a{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:46px;padding:10px;}
.nav-course-group small{flex-shrink:0;white-space:nowrap;margin:0;padding:2px 6px;border-radius:4px;background:#f3f6f9;color:#5a6b80;font-size:11px;font-weight:500;font-variant-numeric:tabular-nums;}
.nav-course-group a:hover small{background:#e0effa;color:#0065a6;}
.nav-popover .nav-all-courses{grid-column:1/-1;border-top:1px solid #e6edf3;border-radius:0;padding:16px 10px 0;color:#0065a6;font-size:13px;}
.nav-popover .nav-all-courses:hover{background:transparent;text-decoration:underline;text-underline-offset:4px;}
.nav-labels>a:hover,.nav-dropdown summary:hover{color:#006bd6;}
.site-header :is(a,summary,button):focus-visible{outline:3px solid #6ca9ef;outline-offset:3px;border-radius:6px;}
.nav-mobile-toggle{display:none;}
#learning-title,#learning-steps,#learning-feedback,#parent-view,#courses{scroll-margin-top:125px;}

@media(min-width:901px) and (max-width:1100px){
  .site-header{padding-inline:24px;}
  .site-header .header-inner{grid-template-columns:auto 1fr auto;gap:22px;padding-inline:20px;}
  .header-inner .nav-labels{gap:18px;font-size:13px;}
  .header-inner .brand{width:110px;}
  .header-inner .nav-end{gap:14px;}
  .header-inner .top-cta{padding-inline:16px;}
}
@media(max-width:900px){
  .site-header{padding:12px;}
  .site-header .header-inner{position:relative;width:100%;grid-template-columns:1fr auto auto;gap:16px;min-height:62px;padding:8px 14px;}
  .header-inner .brand{width:108px;}
  .nav-mobile-toggle{display:block;border:0;background:transparent;min-height:44px;padding:10px 4px;color:#10265a;font:inherit;font-size:13px;font-weight:600;cursor:pointer;}
  .header-inner .nav-end{grid-column:3;gap:12px;font-size:13px;}
  .header-inner .top-cta{padding-inline:14px;font-size:13px;}
  .header-inner .nav-labels{display:none;}
  .header-inner.nav-expanded .nav-labels{display:flex;position:absolute;top:calc(100% + 10px);left:0;right:0;background:#fff;padding:12px;border:1px solid #e6edf3;border-radius:12px;box-shadow:0 10px 28px #10265a14;flex-direction:column;align-items:stretch;gap:4px;max-height:calc(100svh - 112px);overflow:auto;}
  .nav-labels>a{padding:12px;}
  .nav-dropdown summary{padding:10px 12px;justify-content:space-between;}
  .nav-popover{position:static;width:100%;box-shadow:none;border:0;background:#f8fafc;padding:12px 6px;margin:4px 0 8px;}
  .nav-course-menu{gap:12px 8px;}
  .nav-course-group+.nav-course-group{padding-left:8px;}
  .nav-course-group strong{font-size:14px;margin-inline:6px;}
  .nav-course-group a{gap:4px;padding-inline:6px;font-size:12px;}
  .nav-course-group small{padding-inline:4px;font-size:10px;}
}
@media(max-width:380px){
  .site-header .header-inner{gap:8px;padding-inline:10px;}
  .header-inner .brand{width:92px;}
  .header-inner .nav-end{gap:8px;}
  .header-inner .top-cta{padding-inline:10px;}
  .nav-course-menu{grid-template-columns:1fr;}
  .nav-course-group+.nav-course-group{border-left:0;padding-left:0;}
}