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a{min-height:2.5rem;padding:0 .9rem;border-radius:999px;color:var(--muted);transition:background .16s ease,color .16s ease}.top-nav a:hover,.top-nav a:focus-visible{background:color-mix(in srgb,var(--brand-paper) 72%,transparent);color:var(--brand-ink)}.top-nav a.is-active{background:color-mix(in srgb,var(--brand-ink) 92%,transparent);color:var(--brand-paper)}.bottom-nav{display:none}.main-content{padding:1.4rem var(--shell-gutter) 1.6rem}.hero,.page-header,.course-hero{padding:2rem}.hero--welcome{grid-template-columns:minmax(0,1fr) auto;align-items:end}.hero__actions{justify-content:flex-end}.course-hero{grid-template-columns:minmax(0,1fr) 18rem;align-items:start}}@media(min-width:960px){.profile-menu__label{display:grid}.profile-menu__trigger{padding-right:.35rem}.profile-menu__chevron{display:block}}@media(min-width:1040px){.feed-layout{grid-template-columns:minmax(0,1fr) 21rem;align-items:start}.lesson-detail-layout{grid-template-columns:minmax(0,1fr) 20rem;align-items:start}}@keyframes skeleton-shimmer{0%{background-position:100% 0}to{background-position:-100% 0}}.icon-btn{display:inline-flex;align-items:center;justify-content:center;gap:.3rem;min-width:2rem;min-height:2rem;padding:.3rem;border:0;border-radius:8px;background:transparent;color:var(--primary);font:inherit;font-size:1rem;line-height:1;cursor:pointer;transition:background .14s ease,color .14s ease}.icon-btn:hover,.icon-btn:focus-visible{background:color-mix(in srgb,var(--secondary),transparent 84%);color:var(--secondary)}.icon-btn:focus-visible{outline:2px solid color-mix(in srgb,var(--secondary),transparent 35%);outline-offset:1px}.icon-btn:disabled{color:var(--muted);cursor:wait;background:transparent}.icon-btn--active{background:color-mix(in srgb,var(--secondary),transparent 80%);color:var(--secondary)}@media(pointer:coarse){.icon-btn{min-width:2.75rem;min-height:2.75rem}}.admin-btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;min-height:2.45rem;padding:0 .95rem;border:1px solid rgba(17,24,39,.14);border-radius:8px;background:#fff;color:#111827;font:inherit;font-weight:900;line-height:1;white-space:nowrap;cursor:pointer;transition:background-color .16s ease,border-color .16s ease,box-shadow .16s ease}.admin-btn:hover:not(:disabled){background:#f8fafc;box-shadow:0 8px 20px #0f172a1a}.admin-btn:focus-visible{outline:2px solid #111827;outline-offset:2px}.admin-btn:disabled{cursor:not-allowed;opacity:.6}.admin-btn--primary{border-color:#111827;background:#111827;color:#fff}.admin-btn--primary:hover:not(:disabled){background:#1f2937;border-color:#1f2937;box-shadow:0 10px 24px #0f172a2e}.admin-btn--secondary{border-color:#11182724;background:#fff;color:#111827}.admin-btn--danger{border-color:#b4231847;background:#fff;color:#b42318}.admin-btn--danger:hover:not(:disabled){background:var(--danger-bg, #fff4f2);border-color:#b4231873}.app-tooltip{position:fixed;z-index:1000;padding:.3rem .55rem;border-radius:6px;background:color-mix(in srgb,var(--brand-ink, #1f2937) 94%,transparent);color:#fff;font-size:.74rem;font-weight:700;letter-spacing:.01em;white-space:nowrap;pointer-events:none;opacity:0;visibility:hidden;transition:opacity .12s ease .16s,visibility 0ms linear .28s}.app-tooltip.is-visible{opacity:1;visibility:visible;transition:opacity .12s ease .16s}