.lesson-stage-col:has(>.lesson-stage[data-check-open=true]) .lesson-nowplaying{display:none}.lesson-check-backdrop{position:absolute;inset:0;z-index:25;display:flex;flex-direction:column;align-items:center;padding:10px;background:color-mix(in srgb,var(--scrim-ink) 28%,transparent);animation:lesson-check-fade .22s ease}.dark .lesson-check-backdrop{background:color-mix(in srgb,var(--shade-ink) 28%,transparent)}.lesson-check-backdrop:after,.lesson-check-backdrop:before{content:"";flex:0 1 max(0px,var(--lesson-check-nudge,0px))}.lesson-check-backdrop:before{flex-basis:max(0px,calc(-1 * var(--lesson-check-nudge, 0px)))}.lesson-check-backdrop>.lesson-check-modal{flex-shrink:0;margin-block:auto}.lesson-check-modal{--check-tint:var(--subject-tint);--check-ink:color-mix(in oklab,var(--subject-tint) 60%,var(--text));--check-solid:var(--check-ink);--check-on-solid:var(--ink-bright);position:relative;isolation:isolate;width:min(1120px,100%);height:auto;max-height:100%;display:flex;flex-direction:column;overflow:hidden;border-radius:24px;border:1px solid var(--border);background:color-mix(in srgb,var(--surface-solid) 86%,var(--card-glass));color:var(--text);outline:none;backdrop-filter:blur(24px) saturate(180%);-webkit-backdrop-filter:blur(24px) saturate(180%);box-shadow:var(--rim),var(--shadow-2);animation:lesson-check-rise .22s cubic-bezier(.22,1,.36,1)}.dark .lesson-check-modal{backdrop-filter:blur(24px) saturate(140%);-webkit-backdrop-filter:blur(24px) saturate(140%)}.lesson-check-modal[data-width=focus]{height:100%}.dark .lesson-check-modal{--check-on-solid:var(--background)}.lesson-check-modal[data-tone=success]{--check-tint:var(--feedback-correct-500);--check-ink:color-mix(in oklab,var(--ok) 78%,var(--text))}.lesson-check-modal[data-tone=review]{--check-tint:var(--feedback-caution-500);--check-ink:color-mix(in oklab,var(--warn) 78%,var(--text))}.lesson-check-aura{position:absolute;inset:0 0 auto 0;height:160px;z-index:0;background:linear-gradient(180deg,color-mix(in srgb,var(--check-tint) 12%,transparent),transparent);pointer-events:none}.lesson-check-head{position:relative;z-index:2;flex-shrink:0;display:flex;align-items:center;gap:10px;min-height:44px;padding:5px 10px 5px 12px;border-bottom:1px solid var(--border);background:color-mix(in srgb,var(--check-tint) 8%,transparent);transition:background .32s ease}.lesson-check-cta:focus-visible,.lesson-check-rail-pips button:focus-visible,.lesson-check-skip:focus-visible,.lesson-conf-chip:focus-visible,.lesson-hint-btn:focus-visible,.lesson-q-expand:focus-visible,.lesson-q-opt:focus-visible,.lesson-recheck-btn:focus-visible{outline:2px solid var(--check-ink,var(--brand));outline-offset:2px}.lesson-check-icon{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:26px;height:26px;border-radius:9px;background:color-mix(in srgb,var(--check-tint) 18%,transparent);border:1px solid color-mix(in srgb,var(--check-tint) 34%,transparent);color:var(--check-ink);transition:background .32s ease,border-color .32s ease,color .32s ease}.lesson-check-titles{display:flex;align-items:baseline;gap:10px;flex:1 1 auto;min-width:0}.lesson-check-sub,.lesson-check-title{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.lesson-check-title{flex-shrink:0;font-size:14px;font-weight:700;letter-spacing:-.01em;line-height:1.2;color:var(--check-ink);transition:color .32s ease}.lesson-check-sub{min-width:0;line-height:1.3}.lesson-check-chip,.lesson-check-sub{font-size:12px;color:var(--text-muted)}.lesson-check-chip{display:flex;align-items:center;gap:6px;flex-shrink:0;padding:5px 10px;border-radius:9999px;border:1px solid var(--border);background:var(--panel-fill-2);font-weight:600;white-space:nowrap}.lesson-check-chip[data-tone=review],.lesson-check-chip[data-tone=success]{border-color:color-mix(in srgb,var(--check-tint) 35%,transparent);background:color-mix(in srgb,var(--check-tint) 8%,transparent);color:var(--check-ink)}.lesson-check-rail-pips{display:flex;align-items:center;gap:8px;flex-shrink:0;max-width:100%;overflow-x:auto;scrollbar-width:none;padding:1px 8px;border-radius:9999px;border:1px solid var(--border);background:var(--panel-fill-2)}.lesson-check-rail-pips::-webkit-scrollbar{display:none}.lesson-check-rail-pips button:after{content:"";position:absolute;inset:-4px}.lesson-check-rail-pips button{position:relative;display:flex;flex-shrink:0;align-items:center;justify-content:center;width:36px;height:36px;border-radius:9999px;border:1px solid var(--border);background:var(--panel-fill-2);color:var(--text-muted);font-size:13px;font-weight:600;font-variant-numeric:tabular-nums;transition:background .16s ease,border-color .16s ease,color .16s ease}.lesson-check-rail-pips button[data-state=current]{border-color:color-mix(in srgb,var(--subject-tint) 55%,transparent);background:color-mix(in srgb,var(--subject-tint) 30%,transparent);color:var(--text)}.lesson-check-rail-pips button[data-state=correct]{border-color:color-mix(in srgb,var(--feedback-correct-500) 50%,transparent);background:color-mix(in srgb,var(--feedback-correct-500) 22%,transparent);color:var(--feedback-correct-700)}.dark .lesson-check-rail-pips button[data-state=correct]{color:var(--feedback-correct-100)}.lesson-check-rail-pips button[data-state=wrong]{border-color:color-mix(in srgb,var(--feedback-wrong-500) 50%,transparent);background:color-mix(in srgb,var(--feedback-wrong-500) 18%,transparent);color:var(--feedback-wrong-700)}.dark .lesson-check-rail-pips button[data-state=wrong]{color:var(--feedback-wrong-200)}.lesson-check-rail-pips button[data-state=answered]{border-color:color-mix(in srgb,var(--subject-tint) 35%,transparent);background:color-mix(in srgb,var(--subject-tint) 14%,transparent);color:var(--text-muted)}.lesson-check-body{position:relative;z-index:2;flex:0 1 auto;min-height:0;overflow-y:auto;overscroll-behavior:contain;padding:12px 16px;display:flex;flex-direction:column;gap:12px}.lesson-check-lone>.lesson-q-card[data-state]{overflow:visible;padding:0;border:none;border-radius:0;background:none;box-shadow:none}@media (min-width:641px) and (min-height:640px){.lesson-check-lone .lesson-q-text{font-size:20px;line-height:1.5;margin-bottom:14px}.lesson-check-lone .lesson-q-fill{font-size:18px}.lesson-check-lone .lesson-q-opt{min-height:54px;padding:10px 14px;font-size:16.5px}}.lesson-check-locked{display:flex;align-items:center;gap:9px;padding:0 4px;font-size:12px;color:var(--text-muted)}@media (min-width:641px){.lesson-check-locked{display:none}}.is-phone-landscape .lesson-check-locked{display:flex}.lesson-check-solution{border-radius:18px;border:1px solid color-mix(in srgb,var(--subject-tint) 24%,transparent);background:color-mix(in srgb,var(--subject-tint) 7%,transparent);padding:16px 18px}.lesson-check-solution-head{display:flex;align-items:center;gap:8px;margin-bottom:14px;font-size:13px;font-weight:700;letter-spacing:.02em;color:var(--text)}.lesson-check-solution-head svg{color:var(--subject-tint);flex-shrink:0}.lesson-check-solution-rule{flex:1;height:1px;background:linear-gradient(90deg,color-mix(in srgb,var(--subject-tint) 35%,transparent),transparent)}.lesson-check-foot{position:relative;z-index:2;flex-shrink:0;display:flex;align-items:center;gap:12px;padding:5px 10px 5px 12px;border-top:1px solid var(--border);background:color-mix(in srgb,var(--check-tint) 8%,transparent);transition:background .32s ease}.lesson-check-note{display:flex;align-items:center;gap:6px;min-width:0;font-size:12px;color:var(--text-muted)}.lesson-check-cta{display:inline-flex;align-items:center;justify-content:center;gap:7px;flex-shrink:0;height:44px;padding:0 20px;border-radius:9999px;border:1px solid transparent;background:var(--check-solid);color:var(--check-on-solid);font-size:14px;font-weight:600;transition:background .16s ease,transform .16s ease}.lesson-check-cta:hover:not(:disabled){transform:translateY(-1px)}.lesson-check-skip-wrap{display:flex;align-items:center;gap:2px;min-width:0}.lesson-check-skip{display:inline-flex;align-items:center;flex-shrink:0;white-space:nowrap;min-height:44px;margin-left:-2px;padding:0 10px;border-radius:10px;border:none;background:transparent;color:var(--text-muted);font-size:14px;font-weight:600;text-underline-offset:3px;transition:color .14s ease}.lesson-check-skip:hover{color:var(--text);text-decoration:underline}.lesson-check-skip-note{margin:0;font-size:12px;line-height:1.35;color:var(--text-muted)}.lesson-check-cta:disabled{border-color:var(--border);background:var(--panel-fill-2);color:var(--text-muted);cursor:not-allowed}.lesson-q-card{position:relative;overflow:hidden;border-radius:18px;border:1px solid var(--border);background:var(--panel-fill);padding:16px 18px 18px;box-shadow:var(--shadow-1);transition:border-color .24s ease,background .24s ease,box-shadow .24s ease}.dark .lesson-q-card{box-shadow:none}.lesson-q-card[data-state=current]{border-color:color-mix(in srgb,var(--subject-tint) 35%,transparent);background:color-mix(in srgb,var(--subject-tint) 6%,transparent);box-shadow:0 0 0 1px color-mix(in srgb,var(--subject-tint) 12%,transparent),0 14px 40px color-mix(in srgb,var(--subject-tint) 12%,transparent)}.lesson-q-card[data-state=correct]{border-color:color-mix(in srgb,var(--feedback-correct-500) 28%,transparent);background:color-mix(in srgb,var(--feedback-correct-500) 6%,transparent)}.lesson-q-card[data-state=wrong]{border-color:color-mix(in srgb,var(--feedback-wrong-500) 26%,transparent);background:color-mix(in srgb,var(--feedback-wrong-500) 5%,transparent)}.lesson-q-meta{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:8px}.lesson-q-spacer{flex:1 1 0;min-width:0}.lesson-q-num{display:flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:9999px;border:1px solid var(--border);background:var(--panel-fill-2);font-size:12px;font-weight:600;font-variant-numeric:tabular-nums;color:var(--text-muted)}.lesson-q-card[data-state=current] .lesson-q-num{border-color:color-mix(in srgb,var(--subject-tint) 55%,transparent);background:color-mix(in srgb,var(--subject-tint) 30%,transparent);color:var(--text)}.lesson-q-kind{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:color-mix(in oklab,var(--subject-tint) 60%,var(--text))}.lesson-q-dot{width:3px;height:3px;border-radius:9999px;background:color-mix(in oklab,var(--text) 25%,transparent)}.lesson-q-pill{padding:3px 9px;border-radius:9999px;border:1px solid var(--border);background:var(--panel-fill-2);color:var(--text-muted);font-size:12px;font-weight:600;white-space:nowrap}.lesson-q-pill[data-tone=easy],.lesson-q-pill[data-tone=hard],.lesson-q-pill[data-tone=medium]{text-transform:capitalize}.lesson-q-pill[data-tone=easy]{border-color:color-mix(in srgb,var(--ok) 35%,transparent);background:color-mix(in srgb,var(--ok) 7%,transparent);color:color-mix(in oklab,var(--ok) 78%,var(--text))}.lesson-q-pill[data-tone=medium]{border-color:color-mix(in srgb,var(--warn) 35%,transparent);background:color-mix(in srgb,var(--warn) 7%,transparent);color:color-mix(in oklab,var(--warn) 78%,var(--text))}.lesson-q-pill[data-tone=hard]{border-color:color-mix(in srgb,var(--bad) 35%,transparent);background:color-mix(in srgb,var(--bad) 7%,transparent);color:color-mix(in oklab,var(--bad) 78%,var(--text))}.lesson-q-streak{display:flex;align-items:center;gap:5px;padding:3px 10px;border-radius:9999px;border:1px solid color-mix(in srgb,var(--feedback-nudge-500) 30%,transparent);background:color-mix(in srgb,var(--feedback-nudge-500) 14%,transparent);color:var(--feedback-nudge-700);font-size:12px;font-weight:700;white-space:nowrap}.dark .lesson-q-streak{color:var(--feedback-nudge-300)}.lesson-q-expand{position:relative;display:flex;align-items:center;gap:5px;padding:3px 10px;border-radius:9999px;border:1px solid color-mix(in srgb,var(--subject-tint) 40%,transparent);background:color-mix(in srgb,var(--subject-tint) 14%,transparent);color:color-mix(in oklab,var(--subject-tint) 60%,var(--text));font-size:12px;font-weight:600;white-space:nowrap;transition:background .14s ease}.lesson-q-expand:after{content:"";position:absolute;inset:-10px -4px}.lesson-q-expand:hover{background:color-mix(in srgb,var(--subject-tint) 24%,transparent)}.lesson-q-verdict{display:flex;align-items:center;gap:5px;font-size:13px;font-weight:700;white-space:nowrap;color:var(--text-muted)}.lesson-q-verdict[data-state=correct]{color:color-mix(in oklab,var(--ok) 78%,var(--text))}.lesson-q-verdict[data-state=wrong]{color:color-mix(in oklab,var(--bad) 78%,var(--text))}.lesson-q-text{font-size:17px;line-height:1.55;font-weight:500;margin-bottom:10px;max-width:82ch;text-wrap:pretty;color:var(--text);overflow-x:auto;overflow-y:hidden;padding-block:.15em;overscroll-behavior-x:contain}.lesson-q-facts{font-size:12px;color:var(--text-muted);white-space:nowrap}.lesson-q-task{margin:0 0 12px;font-size:13px;line-height:1.45;color:var(--text-muted)}.lesson-q-passage{margin-bottom:16px;padding:12px 16px;border-radius:12px;border:1px solid color-mix(in srgb,var(--feedback-info-500) 22%,transparent);background:color-mix(in srgb,var(--feedback-info-400) 6%,transparent)}.lesson-q-passage-head{margin:0 0 4px;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:color-mix(in oklab,var(--feedback-info-700) 78%,var(--text))}.dark .lesson-q-passage-head{color:var(--feedback-info-300)}.lesson-q-ar,.lesson-q-passage-body{font-size:14px;color:var(--text)}.lesson-q-ar{margin-bottom:8px;padding:10px 16px;border-radius:12px;border:1px solid color-mix(in srgb,var(--brand) 22%,transparent);background:color-mix(in srgb,var(--brand) 8%,transparent)}.lesson-q-ar[data-part=reason]{border-color:color-mix(in srgb,var(--accent) 24%,transparent);background:color-mix(in srgb,var(--accent) 8%,transparent)}.lesson-q-opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));gap:8px;margin-bottom:4px}.lesson-q-opts--row{display:flex}.lesson-q-opt{display:flex;align-items:center;gap:12px;width:100%;min-height:46px;padding:8px 12px;border-radius:14px;border:1px solid var(--border);background:var(--panel-fill);color:var(--text);font-size:15px;text-align:left;transition:background .14s ease,border-color .14s ease,opacity .24s ease,transform .14s ease}.lesson-q-opt--tf{flex:1 1 0;justify-content:center;font-weight:600}.lesson-q-opt[data-state=idle]:hover:not(:disabled){border-color:color-mix(in srgb,var(--subject-tint) 40%,transparent);background:color-mix(in srgb,var(--subject-tint) 10%,transparent);transform:translateY(-1px)}.lesson-q-opt[data-state=selected]{border-color:color-mix(in srgb,var(--subject-tint) 45%,transparent);background:color-mix(in srgb,var(--subject-tint) 15%,transparent)}.lesson-q-opt[data-state=correct]{border-color:color-mix(in srgb,var(--feedback-correct-500) 50%,transparent);background:color-mix(in srgb,var(--feedback-correct-500) 14%,transparent);font-weight:600;box-shadow:0 0 0 1px color-mix(in srgb,var(--feedback-correct-500) 18%,transparent),0 8px 26px color-mix(in srgb,var(--feedback-correct-500) 13%,transparent)}.lesson-q-opt[data-state=wrong]{border-color:color-mix(in srgb,var(--feedback-wrong-500) 50%,transparent);background:color-mix(in srgb,var(--feedback-wrong-500) 12%,transparent)}.lesson-q-opt[data-state=dim]{opacity:.42}.lesson-q-opt-key{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:26px;height:26px;border-radius:9px;border:1px solid var(--border);background:var(--panel-fill-2);color:var(--text-muted);font-size:12px;font-weight:600}.lesson-q-opt[data-state=correct] .lesson-q-opt-key{border-color:color-mix(in srgb,var(--feedback-correct-500) 50%,transparent);background:color-mix(in srgb,var(--feedback-correct-500) 28%,transparent);color:var(--feedback-correct-800)}.dark .lesson-q-opt[data-state=correct] .lesson-q-opt-key{color:var(--feedback-correct-100)}.lesson-q-opt[data-state=wrong] .lesson-q-opt-key{border-color:color-mix(in srgb,var(--feedback-wrong-500) 50%,transparent);background:color-mix(in srgb,var(--feedback-wrong-500) 24%,transparent);color:var(--feedback-wrong-900)}.dark .lesson-q-opt[data-state=wrong] .lesson-q-opt-key{color:var(--feedback-wrong-200)}.lesson-q-submit{display:inline-flex;align-items:center;gap:6px;height:44px;padding:0 16px;border-radius:9999px;border:1px solid color-mix(in srgb,var(--subject-tint) 45%,transparent);background:color-mix(in srgb,var(--subject-tint) 18%,transparent);color:var(--subject-tint);font-size:13px;font-weight:600;transition:background .14s ease,opacity .14s ease}.dark .lesson-q-submit{color:var(--tint-ink-pale)}.lesson-q-submit:hover:not(:disabled){background:color-mix(in srgb,var(--subject-tint) 28%,transparent)}.lesson-q-submit:disabled{opacity:.4;cursor:not-allowed}.lesson-q-count{margin-top:6px;text-align:right;font-size:12px;font-variant-numeric:tabular-nums;color:var(--text-muted)}.lesson-q-blank{display:inline-block;width:auto;min-height:44px;padding:2px 10px;border-radius:8px;border:1.5px solid color-mix(in srgb,var(--text-muted) 55%,transparent);background:color-mix(in srgb,var(--brand) 5%,transparent);color:var(--text);font-size:16px;line-height:1.3;text-align:center;vertical-align:middle;outline:none;transition:border-color .14s ease,box-shadow .14s ease}.lesson-q-answer::-moz-placeholder,.lesson-q-blank::-moz-placeholder{color:var(--text-muted);opacity:1}.lesson-q-answer::placeholder,.lesson-q-blank::placeholder{color:var(--text-muted);opacity:1}.lesson-q-answer:focus,.lesson-q-blank:focus{border-color:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 18%,transparent)}.lesson-q-blank[data-state=right]{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 10%,transparent);color:var(--ok)}.lesson-q-blank[data-state=wrong]{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 8%,transparent);color:var(--bad)}.lesson-q-blank-verdict{display:flex;align-items:center;gap:8px;margin-top:16px;font-size:14px;line-height:1.5}.lesson-q-blank-verdict[data-state=right]{color:color-mix(in oklab,var(--ok) 78%,var(--text))}.lesson-q-blank-verdict[data-state=wrong]{color:color-mix(in oklab,var(--bad) 78%,var(--text))}.lesson-q-blank-num{display:inline-flex;flex-shrink:0;align-items:center;justify-content:center;width:22px;height:22px;border-radius:6px;border:1px solid color-mix(in srgb,var(--brand) 45%,transparent);color:var(--brand);font-size:12px;font-weight:600}.lesson-q-blank-fix{margin-left:6px;white-space:nowrap;font-size:13px;font-weight:600;color:color-mix(in oklab,var(--ok) 78%,var(--text))}.lesson-q-answer{display:block;width:100%;min-height:88px;resize:none;padding:10px 14px;border-radius:12px;border:1.5px solid color-mix(in srgb,var(--text-muted) 55%,transparent);background:color-mix(in srgb,var(--brand) 5%,transparent);color:var(--text);font-size:16px;line-height:1.5;outline:none;transition:border-color .14s ease,box-shadow .14s ease}.lesson-q-answer[data-listening=true]{border-color:var(--bad)}.lesson-q-answer:disabled{color:var(--text-muted)}.lesson-q-answer[data-tools="1"]{padding-right:58px}.lesson-q-answer[data-tools="2"]{padding-bottom:56px}.lesson-q-tools{position:absolute;right:6px;bottom:6px;display:flex;gap:6px}.lesson-q-tool,.lesson-q-voice{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:9999px;border:1px solid color-mix(in srgb,var(--brand) 30%,transparent);background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand);transition:background .14s ease}.lesson-q-tool:hover,.lesson-q-voice:hover{background:color-mix(in srgb,var(--brand) 20%,transparent)}.lesson-q-tool[aria-expanded=true]{border-color:var(--brand);background:color-mix(in srgb,var(--brand) 22%,transparent)}.lesson-q-voice[aria-pressed=true]{border-color:color-mix(in srgb,var(--bad) 40%,transparent);background:color-mix(in srgb,var(--bad) 14%,transparent);color:var(--bad)}.lesson-q-voice-note{display:flex;align-items:center;gap:6px;margin-top:6px;font-size:12px;color:var(--bad)}.lesson-q-voice-note.is-warn{color:var(--warn)}.math-keys{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;overscroll-behavior-x:contain}.math-keys::-webkit-scrollbar{display:none}.math-key{flex-shrink:0;min-width:44px;height:44px;padding:0 8px;border-radius:10px;border:1px solid var(--border);background:color-mix(in srgb,var(--brand) 6%,transparent);color:var(--text);font-size:17px;line-height:1;transition:background .14s ease}.math-key:hover{background:color-mix(in srgb,var(--brand) 14%,transparent)}.lesson-q-tool:focus-visible,.lesson-q-voice:focus-visible,.math-key:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.lesson-q-strip{margin-top:10px}.lesson-conf-inline,.lesson-q-strip{display:flex;align-items:center;flex-wrap:wrap;gap:10px}.lesson-conf-label{font-size:12px;color:var(--text-muted)}.lesson-conf-row{display:flex;gap:6px}.lesson-conf-chip{height:44px;padding:0 12px;border-radius:9999px;border:1px solid var(--border);background:var(--panel-fill);color:var(--text-muted);font-size:12px;font-weight:600;transition:background .14s ease,border-color .14s ease,color .14s ease}.lesson-conf-chip:hover:not(:disabled){border-color:color-mix(in srgb,var(--subject-tint) 40%,transparent)}.lesson-conf-chip[aria-pressed=true]{border-color:color-mix(in srgb,var(--subject-tint) 45%,transparent);background:color-mix(in srgb,var(--subject-tint) 16%,transparent);color:var(--subject-tint)}.dark 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