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scale(.985);box-shadow:var(--e-1)}.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}.appbar{position:sticky;top:0;z-index:20;height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:var(--s-4);padding-inline:var(--s-5);background:var(--brand-900);background:color-mix(in srgb,var(--brand-900) 92%,transparent);backdrop-filter:saturate(1.6) blur(12px);-webkit-backdrop-filter:saturate(1.6) blur(12px);color:#fff;box-shadow:var(--e-2)}.appbar__brand{font-weight:800;font-size:1.05rem;letter-spacing:-.02em}.appbar__brand,.appbar__link{color:#fff;text-decoration:none}.appbar__link{min-height:36px;padding:0 var(--s-4);display:inline-flex;align-items:center;border-radius:var(--r-full);background:hsla(0,0%,100%,.14);font-size:.875rem;font-weight:600;border:1px solid hsla(0,0%,100%,.1);cursor:pointer;transition:background-color var(--t-base) var(--ease)}@media (hover:hover){.appbar__link:hover{background:hsla(0,0%,100%,.26)}}.appbar :focus-visible{outline-color:#fff}.pill{display:inline-flex;align-items:center;gap:var(--s-2);padding:var(--s-1) var(--s-3);border-radius:var(--r-full);font-size:.75rem;font-weight:800;letter-spacing:.02em;border:1px solid transparent}.pill--ok{background:var(--ok-bg);color:var(--ok-600);border-color:var(--ok-line)}.pill--bad{background:var(--bad-bg);color:var(--bad-600);border-color:var(--bad-line)}.pill--warn{background:var(--warn-bg);color:var(--warn-600);border-color:var(--warn-line)}.pill--info{background:var(--brand-50);color:var(--brand-600);border-color:var(--brand-100)}.notice{display:flex;gap:var(--s-3);align-items:flex-start;padding:var(--s-4) var(--s-5);border-radius:var(--r-md);border:1px solid var(--line);background:var(--surface-2);font-size:.9rem;line-height:1.55}.notice--warn{background:var(--warn-bg);border-color:var(--warn-line);color:var(--warn-600)}.notice--bad{background:var(--bad-bg);border-color:var(--bad-line);color:var(--bad-600)}.notice__icon{flex-shrink:0;margin-top:1px}.option{display:flex;align-items:center;gap:var(--s-3);width:100%;text-align:left;min-height:56px;padding:var(--s-4);border:1.5px solid var(--line);border-radius:var(--r-md);background:var(--surface);color:var(--ink);font-size:.975rem;line-height:1.45;cursor:pointer;transition:border-color var(--t-base) var(--ease),background-color var(--t-base) var(--ease),transform var(--t-fast) var(--ease),box-shadow var(--t-base) var(--ease)}@media (hover:hover){.option:hover:not(:disabled){border-color:var(--line-strong);background:var(--surface-2)}}.option:active:not(:disabled){transform:scale(.99)}.option:disabled{cursor:default}.option[data-state=selected]{border-color:var(--brand-600);background:var(--brand-50);box-shadow:0 0 0 3px var(--brand-100)}@media (hover:hover){.option[data-state=selected]:hover{border-color:var(--brand-600);background:var(--brand-50)}}.option[data-state=correct]{border-color:var(--ok-500);background:var(--ok-bg)}.option[data-state=wrong]{border-color:var(--bad-500);background:var(--bad-bg)}.option__key{flex-shrink:0;width:30px;height:30px;display:grid;place-items:center;border-radius:var(--r-full);border:1.5px solid var(--line-strong);background:var(--surface);color:var(--ink-muted);font-size:.8rem;font-weight:800;transition:background-color var(--t-base) var(--ease),border-color var(--t-base) var(--ease),color var(--t-base) var(--ease)}.option[data-state=selected] .option__key{background:var(--brand-600);border-color:var(--brand-600);color:#fff}.option[data-state=correct] .option__key{background:var(--ok-500);border-color:var(--ok-500);color:#fff}.option[data-state=wrong] .option__key{background:var(--bad-500);border-color:var(--bad-500);color:#fff}.timer{display:inline-flex;align-items:center;gap:var(--s-2);padding:var(--s-2) var(--s-4);border-radius:var(--r-full);background:hsla(0,0%,100%,.14);border:1px solid hsla(0,0%,100%,.12);font-weight:800;font-variant-numeric:tabular-nums;transition:background-color var(--t-slow) var(--ease)}.timer[data-urgent=true]{background:var(--bad-500);border-color:transparent;animation:timer-pulse 2s var(--ease) infinite}@keyframes timer-pulse{0%,to{box-shadow:0 0 0 0 rgba(220,38,38,.5)}50%{box-shadow:0 0 0 6px rgba(220,38,38,0)}}.progress-rail{height:3px;background:var(--line);overflow:hidden}.progress-rail__fill{height:100%;width:0;background:linear-gradient(90deg,var(--brand-500),var(--brand-600));border-radius:0 var(--r-full) var(--r-full) 0;transition:width var(--t-slow) var(--ease)}.navgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:var(--s-2)}.navgrid__cell{aspect-ratio:1;display:grid;place-items:center;position:relative;border-radius:var(--r-sm);border:1.5px solid var(--line);background:var(--surface-2);color:var(--ink-muted);font-size:.8rem;font-weight:700;font-variant-numeric:tabular-nums;cursor:pointer;transition:transform var(--t-fast) var(--ease),background-color var(--t-base) var(--ease),border-color var(--t-base) var(--ease),color var(--t-base) var(--ease)}@media (hover:hover){.navgrid__cell:hover{transform:scale(1.08);border-color:var(--brand-500)}}.navgrid__cell[data-answered=true]{background:var(--brand-600);border-color:var(--brand-600);color:#fff}.navgrid__cell[data-current=true]{outline:2px solid var(--ink);outline-offset:2px}.navgrid__cell[data-flagged=true]:after{content:"";position:absolute;top:-3px;right:-3px;width:9px;height:9px;border-radius:var(--r-full);background:var(--warn-600);border:1.5px solid var(--surface)}.scrim{position:fixed;inset:0;z-index:50;display:grid;place-items:center;padding:var(--s-5);background:rgba(11,18,32,.55);backdrop-filter:blur(4px);animation:fade-in var(--t-base) var(--ease)}.dialog{width:100%;max-width:420px;background:var(--surface);border-radius:var(--r-xl);padding:var(--s-6);box-shadow:var(--e-4);animation:dialog-in var(--t-slow) var(--ease)}@keyframes fade-in{0%{opacity:0}}@keyframes dialog-in{0%{opacity:0;transform:translateY(8px) scale(.98)}}.skeleton{border-radius:var(--r-md);background:linear-gradient(90deg,var(--surface-2) 25%,#eef2f8 37%,var(--surface-2) 63%);background-size:400% 100%;animation:shimmer 1.3s ease-in-out infinite}@keyframes shimmer{0%{background-position:100% 0}to{background-position:0 0}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.chapter{border-bottom:1px solid var(--line)}.chapter:last-child{border-bottom:0}.chapter__head{display:flex;align-items:center;gap:var(--s-4);width:100%;text-align:left;padding:var(--s-5) var(--s-4);background:transparent;border:0;cursor:pointer;transition:background-color var(--t-base) var(--ease)}@media (hover:hover){.chapter__head:hover{background:var(--surface-2)}}.chapter__no{flex-shrink:0;width:34px;height:34px;display:grid;place-items:center;border-radius:var(--r-full);background:var(--brand-50);color:var(--brand-600);font-weight:800;font-size:.85rem;font-variant-numeric:tabular-nums;transition:background-color var(--t-base) var(--ease),color var(--t-base) var(--ease)}.chapter[data-open=true] .chapter__no{background:var(--brand-600);color:#fff}.chapter__chevron{flex-shrink:0;color:var(--ink-subtle);transition:transform var(--t-slow) var(--ease)}.chapter[data-open=true] .chapter__chevron{transform:rotate(180deg)}.chapter__panel{display:grid;grid-template-rows:0fr;transition:grid-template-rows var(--t-slow) var(--ease)}.chapter[data-open=true] .chapter__panel{grid-template-rows:1fr}.chapter__panel>div{overflow:hidden}.topic{display:flex;align-items:center;gap:var(--s-4);width:100%;text-align:left;padding:var(--s-4) var(--s-4) var(--s-4) var(--s-6);background:transparent;border:0;border-top:1px solid var(--line);cursor:pointer;transition:background-color var(--t-base) var(--ease),padding-left var(--t-base) var(--ease)}@media (hover:hover){.topic:hover{background:var(--brand-50);padding-left:calc(var(--s-6) + 4px)}}.topic__code{flex-shrink:0;min-width:30px;color:var(--ink-subtle);font-size:.8rem;font-weight:700;font-variant-numeric:tabular-nums}.topic__bar{height:4px;background:var(--line);overflow:hidden;margin-top:var(--s-2)}.topic__bar,.topic__bar>i{display:block;border-radius:var(--r-full)}.topic__bar>i{height:100%;background:var(--brand-600);transition:width var(--t-slow) var(--ease)}.topic__done{color:var(--ok-500)}.check{display:flex;align-items:flex-start;gap:var(--s-3);width:100%;text-align:left;padding:var(--s-4) var(--s-5);border:1.5px solid var(--line);border-radius:var(--r-md);background:var(--surface);cursor:pointer;transition:border-color var(--t-base) var(--ease),background-color var(--t-base) var(--ease)}@media (hover:hover){.check:hover{border-color:var(--line-strong);background:var(--surface-2)}}.check[aria-checked=true]{border-color:var(--brand-600);background:var(--brand-50)}.check__box{flex-shrink:0;width:22px;height:22px;margin-top:1px;border-radius:6px;border:1.5px solid var(--line-strong);background:var(--surface);color:#fff;display:grid;place-items:center;transition:background-color var(--t-base) var(--ease),border-color var(--t-base) var(--ease)}.check[aria-checked=true] .check__box{background:var(--brand-600);border-color:var(--brand-600)}