.course-nav{position:relative}.course-nav__trigger{border-radius:var(--radius-sm);color:var(--color-text);white-space:nowrap;cursor:pointer;background:0 0;border:none;align-items:center;gap:.3rem;padding:.35rem .55rem;font-family:inherit;font-size:.84rem;font-weight:500;transition:background .15s,color .15s;display:inline-flex}.course-nav__trigger:hover{background:var(--color-green-light);color:var(--color-green-dark)}.course-nav__trigger--active{background:var(--color-red-light);color:var(--color-red)}.course-nav__chevron{width:.75rem;height:.75rem;transition:transform .2s}.course-nav--open .course-nav__chevron{transform:rotate(180deg)}.course-nav__panel{z-index:110;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);min-width:220px;box-shadow:var(--shadow-md);padding:.75rem;position:absolute;top:calc(100% + .35rem);left:50%;transform:translate(-50%)}.course-nav__hint{text-transform:uppercase;letter-spacing:.04em;color:var(--color-text-muted);margin:0 0 .5rem;font-size:.72rem;font-weight:600}.course-nav__chips{grid-template-columns:1fr 1fr;gap:.4rem;display:grid}.course-nav__chip{border:1px solid var(--color-border);background:var(--color-bg);color:var(--color-text);text-align:center;border-radius:999px;justify-content:center;align-items:center;padding:.5rem .65rem;font-size:.82rem;font-weight:600;line-height:1.2;text-decoration:none;transition:border-color .15s,background .15s,color .15s,box-shadow .15s;display:flex}.course-nav__chip:hover{border-color:var(--color-green);background:var(--color-green-light);color:var(--color-green-dark)}.course-nav__chip--active{border-color:var(--color-green);background:var(--color-green);color:#fff;box-shadow:var(--shadow-sm)}.course-nav__chip--active:hover{background:var(--color-green-dark);color:#fff}.course-nav--mobile{width:100%}.course-nav--mobile .course-nav__trigger{text-align:left;justify-content:space-between;width:100%;padding:.75rem .85rem;font-size:.95rem}.course-nav--mobile .course-nav__panel{min-width:0;box-shadow:none;background:0 0;border:none;border-radius:0;margin:0 0 .25rem;padding:0 .85rem .65rem;position:static;transform:none}.course-nav--mobile .course-nav__chips{grid-template-columns:1fr 1fr}.course-nav--desktop{display:block}.course-nav--mobile{display:none}@media (max-width:1024px){.course-nav--desktop{display:none}.course-nav--mobile{display:block}}
.theme-toggle{border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-bg);width:1.85rem;height:1.85rem;color:var(--color-text-muted);cursor:pointer;justify-content:center;align-items:center;padding:0;transition:border-color .15s,background .15s,color .15s;display:flex}.theme-toggle:hover:not(:disabled){border-color:var(--color-green);background:var(--color-green-light);color:var(--color-text)}.theme-toggle:disabled{cursor:default;opacity:.6}.theme-toggle__icon{width:1rem;height:1rem;display:block}.theme-toggle__placeholder{background:var(--color-border);opacity:.5;border-radius:50%;width:1rem;height:1rem}
.header-prefs{border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-bg);align-items:center;gap:.3rem;padding:.15rem;display:flex}.header-prefs__lang{gap:.2rem;display:flex}.header-prefs .theme-toggle{background:0 0;border:2px solid #0000;border-radius:4px;width:auto;height:auto;padding:.15rem}.header-prefs .theme-toggle:hover:not(:disabled){border-color:var(--color-green);background:0 0}.header-prefs .theme-toggle__icon,.header-prefs .theme-toggle__placeholder{width:20px;height:20px}.header-prefs__lang-btn{cursor:pointer;background:0 0;border:2px solid #0000;border-radius:4px;justify-content:center;align-items:center;padding:.15rem;line-height:0;transition:border-color .15s,box-shadow .15s;display:flex}.header-prefs__lang-btn:hover{border-color:var(--color-green)}.header-prefs__lang-btn--active{border-color:var(--color-green);box-shadow:0 0 0 2px var(--color-green-light)}.header-prefs__flag{border-radius:2px;width:20px;height:auto;display:block;box-shadow:0 1px 2px #0000001f}.header-prefs__toggle{width:1.5rem;height:1.5rem;color:var(--color-text-muted);cursor:pointer;background:0 0;border:none;border-radius:4px;justify-content:center;align-items:center;padding:0;transition:background .15s,color .15s;display:flex}.header-prefs__toggle:hover{background:var(--color-green-light);color:var(--color-text)}.header-prefs__chevron{width:.85rem;height:.85rem;display:block}.header-prefs:not(.header-prefs--expanded){padding:.1rem}@media (max-width:480px){.header-prefs__flag{width:18px}.header-prefs .theme-toggle__icon,.header-prefs .theme-toggle__placeholder{width:18px;height:18px}}