[hidden]{display:none!important}.app-hero{border-bottom:1px solid var(--line);background:radial-gradient(900px 300px at 85% -40%,#5b9be024,#0000 70%);padding-block:clamp(32px,6vw,56px) clamp(20px,4vw,32px)}.app-hero h1{margin-bottom:.3em;font-size:clamp(1.9rem,5vw,2.8rem)}.app-hero .lede{margin-bottom:0}.app-section{padding-block:clamp(24px,5vw,48px)}.app-narrow{max-width:560px}.app-mid{max-width:860px}.crumbs{color:var(--muted);flex-wrap:wrap;gap:4px 8px;margin:0 0 12px;padding:0;font-size:.92rem;list-style:none;display:flex}.crumbs li+li:before{content:"›";color:var(--subtle);margin-right:8px}.crumbs a{color:var(--muted)}.crumbs a:hover{color:var(--text)}.form{gap:18px;display:grid}.field{gap:6px;min-width:0;display:grid}.field label,.label{font-size:.95rem;font-weight:600}.field .hint{color:var(--muted);margin:0;font-size:.88rem}.input,.form input[type=text],.form input[type=email],.form input[type=password],.form select,.form textarea{width:100%;min-height:48px;color:var(--text);font:inherit;background:#07131f99;border:1px solid #f4f7fb47;border-radius:10px;padding:11px 14px;font-size:1rem}.form textarea{resize:vertical;min-height:140px;font-family:ui-monospace,Cascadia Mono,Consolas,monospace;font-size:.92rem}.form input:hover,.form textarea:hover{border-color:#f4f7fb73}.form input:focus-visible,.form textarea:focus-visible,.form select:focus-visible{outline:3px solid var(--focus);outline-offset:1px;border-color:#0000}.form input[readonly]{opacity:.8}[aria-invalid=true]{border-color:#ff8a80!important}.err{color:#ffb4ab;margin:0;font-size:.9rem}.err:empty{display:none}.form-actions{flex-wrap:wrap;align-items:center;gap:12px 18px;display:flex}.form-foot{color:var(--muted);margin-top:20px;font-size:.95rem}.checkbox{align-items:flex-start;gap:10px;font-weight:400;display:flex}.checkbox input{width:20px;height:20px;accent-color:var(--orange);margin-top:3px}.msg{border-radius:var(--radius-sm);border:1px solid var(--line-strong);background:#f4f7fb0a;margin:0 0 18px;padding:12px 16px}.msg:empty{display:none}.msg--ok{color:#c9f2d9;background:#3fa86b1f;border-color:#3fa86b99}.msg--error{color:#ffd6d2;background:#e0605a1f;border-color:#e0605a99}.msg--info{color:#dbe9fa;background:#5b9be01a;border-color:#5b9be08c}.meter{background:#f4f7fb1a;border-radius:999px;height:10px;position:relative;overflow:hidden}.meter>span{border-radius:inherit;background:linear-gradient(90deg, var(--blue), var(--green));width:0;transition:width .4s;position:absolute;inset:0 auto 0 0}.meter--sm{height:6px}.stat-row{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}@media (width>=760px){.stat-row{grid-template-columns:repeat(4,minmax(0,1fr))}}.stat{background:var(--panel-soft);border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px 16px}.stat b{font-family:var(--font-serif);font-size:1.6rem;line-height:1.1;display:block}.stat span{color:var(--muted);font-size:.9rem}.status-pill{border:1px solid var(--line-strong);color:var(--muted);white-space:nowrap;border-radius:999px;align-items:center;gap:6px;padding:2px 10px;font-size:.8rem;font-weight:600;display:inline-flex}.status-pill--done{color:#8fe0b0;background:#3fa86b1a;border-color:#3fa86b8c}.status-pill--open{color:#ffd2a6;background:#e08a3c1a;border-color:#e08a3c8c}.status-pill--locked{color:var(--subtle)}.status-pill--bad{color:#ffb4ab;background:#e0605a1a;border-color:#e0605a8c}.outline{gap:8px;margin:0;padding:0;list-style:none;display:grid}.outline a.row,.outline .row{border-radius:var(--radius-sm);border:1px solid var(--line);color:var(--text);background:#12294a8c;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;min-height:52px;padding:12px 14px;text-decoration:none;display:grid}.outline a.row:hover{background:#12294ad9;border-color:#f4f7fb4d}.outline a.row[aria-current=page]{border-color:var(--orange)}.row .num{font-variant-numeric:tabular-nums;color:var(--subtle);min-width:2.2em;font-size:.9rem}.row .title{min-width:0}.row .title small{color:var(--muted);font-size:.85rem;display:block}.tick{border:2px solid #f4f7fb4d;border-radius:50%;flex:none;place-items:center;width:22px;height:22px;display:inline-grid}.tick[data-done=true]{border-color:var(--green);background:var(--green)}.tick[data-done=true]:after{content:"";border-bottom:2px solid #07131f;border-left:2px solid #07131f;width:9px;height:5px;transform:translateY(-1px)rotate(-45deg)}.part-block{border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(#12294a99,#0f224066)}.part-block+.part-block{margin-top:14px}.part-block>summary{cursor:pointer;border-radius:var(--radius);gap:8px;padding:16px 18px;list-style:none;display:grid}.part-block>summary::-webkit-details-marker{display:none}.part-block>summary h2{margin:0;font-size:clamp(1.15rem,2.6vw,1.35rem)}.part-block>summary .meta{color:var(--muted);flex-wrap:wrap;align-items:center;gap:6px 14px;font-size:.9rem;display:flex}.part-block>summary .chev{transition:transform .2s;display:inline-block}.part-block[open]>summary .chev{transform:rotate(90deg)}.part-body{padding:0 18px 18px}.lesson-layout{gap:28px;display:grid}@media (width>=1080px){.lesson-layout{grid-template-columns:minmax(0,1fr) 320px;align-items:start}.lesson-aside{position:sticky;top:88px}}.player{border-radius:var(--radius);border:1px solid var(--line);aspect-ratio:16/9;background:#000;overflow:hidden}.player video{width:100%;height:100%}.coming-soon{aspect-ratio:16/9;border-radius:var(--radius);text-align:center;background:radial-gradient(500px 220px at 30% 20%, #5b9be029, transparent 70%), radial-gradient(420px 200px at 80% 90%, #e08a3c1f, transparent 70%), var(--panel-soft);border:1px dashed #f4f7fb40;place-items:center;padding:24px;display:grid}.coming-soon .dots{justify-content:center;gap:10px;margin-bottom:14px;display:flex}.coming-soon h2{margin-bottom:6px;font-size:clamp(1.2rem,3vw,1.6rem)}.coming-soon p{color:var(--muted);max-width:44ch;margin:0}@media (width<=520px){.coming-soon{aspect-ratio:auto;min-height:220px}}.resources{flex-wrap:wrap;gap:10px;margin:16px 0 0;padding:0;list-style:none;display:flex}.resources a{min-height:44px}.pager{grid-template-columns:1fr 1fr;gap:12px;margin-top:28px;display:grid}.pager a{border:1px solid var(--line);border-radius:var(--radius-sm);color:var(--text);background:#12294a80;gap:2px;min-height:64px;padding:14px 16px;text-decoration:none;display:grid}.pager a small{color:var(--muted)}.pager a:hover{border-color:#f4f7fb4d}.pager .next{text-align:right;grid-column:2}.squiz{border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(#12294ae6,#0f2240e6);padding:clamp(18px,3vw,26px)}.squiz h2{margin-bottom:4px;font-size:clamp(1.3rem,3vw,1.6rem)}.squiz .meta{color:var(--muted);margin:0 0 16px;font-size:.95rem}.squiz ol.qs{gap:22px;margin:0;padding-left:1.3em;display:grid}.squiz fieldset{border:0;gap:6px;min-width:0;margin:0;padding:0;display:grid}.squiz legend{margin-bottom:8px;padding:0;font-weight:600}.squiz .choice{cursor:pointer;border:1px solid #0000;border-radius:10px;align-items:flex-start;gap:12px;padding:10px 12px;display:flex}.squiz .choice:hover{background:#f4f7fb0a}.squiz .choice input{width:18px;height:18px;accent-color:var(--orange);flex:none;margin-top:4px}.squiz .choice:has(input:focus-visible){outline:3px solid var(--focus);outline-offset:2px}.squiz li.right .choice:has(input:checked){border-color:var(--green);background:#3fa86b1f}.squiz li.wrong .choice:has(input:checked){border-color:var(--red);background:#e0605a1f}.squiz .fb{margin:6px 0 0;font-weight:600}.squiz li.right .fb{color:#8fe0b0}.squiz li.wrong .fb{color:#ffb4ab}.squiz .why{color:var(--muted);margin:4px 0 0;font-size:.95rem}.squiz .q-actions{flex-wrap:wrap;align-items:center;gap:12px;margin-top:22px;display:flex}.squiz .result{margin:0;font-weight:600}.squiz .result.pass{color:#8fe0b0}.squiz .result.fail{color:#ffd2a6}.squiz[data-locked=true] .qs,.squiz[data-locked=true] .q-actions{display:none}.timer{z-index:20;border-radius:var(--radius-sm);border:1px solid var(--line-strong);box-shadow:var(--shadow);background:#0a1a2ff5;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 16px;margin:0 0 18px;padding:10px 16px;display:flex;position:sticky;top:68px}.timer .clock{font-variant-numeric:tabular-nums;font-size:1.2rem;font-weight:700}.timer .clock[data-low=true]{color:#ffb4ab}.timer .saved{color:var(--muted);font-size:.9rem}.tbl-wrap{border:1px solid var(--line);border-radius:var(--radius-sm);overflow-x:auto}table.tbl{border-collapse:collapse;width:100%;font-size:.93rem}.tbl th,.tbl td{text-align:left;vertical-align:top;border-bottom:1px solid var(--line);padding:10px 12px}.tbl th{color:var(--muted);white-space:nowrap;background:#12294a99;font-weight:600;position:sticky;top:0}.tbl tr:last-child td{border-bottom:0}.tbl td.actions{white-space:nowrap}.btn--sm{min-height:36px;padding:6px 14px;font-size:.88rem}.btn--danger{color:#ffb4ab;background:0 0;border-color:#e0605ab3}.btn--danger:hover{color:#ffd6d2;background:#e0605a1f}.linkbox{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.linkbox input{flex:280px;font-family:ui-monospace,Consolas,monospace;font-size:.85rem}.tabs{border-bottom:1px solid var(--line);flex-wrap:wrap;gap:6px;margin-bottom:22px;display:flex}.tabs [role=tab]{color:var(--muted);font:600 1rem var(--font-sans);cursor:pointer;background:0 0;border:0;border-radius:8px 8px 0 0;min-height:48px;padding:12px 14px}.tabs [role=tab][aria-selected=true]{color:var(--text);box-shadow:inset 0 -3px 0 var(--orange)}.tabs [role=tab]:hover{color:var(--text)}.toolbar{flex-wrap:wrap;align-items:end;gap:10px;margin-bottom:14px;display:flex}.toolbar .field{flex:220px}.muted-cell{color:var(--subtle)}.hidden{display:none!important}