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var(--color-border);background:var(--color-card);width:36px;height:36px;color:var(--color-text-muted);cursor:pointer;border-radius:10px;place-items:center;display:grid}._iconBtn_h6ex3_274:hover{color:var(--color-text);border-color:var(--color-primary)}._modalBackdrop_h6ex3_291{z-index:80;background:var(--color-scrim);place-items:center;padding:24px;display:grid;position:fixed;inset:0}._modal_h6ex3_291{background:var(--color-card);border:1px solid var(--color-border-card);border-radius:var(--radius-lg);width:min(440px,100%);box-shadow:var(--shadow-card);padding:20px}._modalHead_h6ex3_310{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}._modalHead_h6ex3_310 h2{font-family:var(--font-display);margin:0;font-size:1.15rem}._modalLead_h6ex3_323{color:var(--color-text-muted);margin:0 0 16px;font-size:.9rem}._field_h6ex3_329{color:var(--color-text-muted);flex-direction:column;gap:6px;margin-bottom:12px;font-size:.85rem;display:flex}._field_h6ex3_329 input,._field_h6ex3_329 select,._field_h6ex3_329 textarea{background:var(--color-card);border:1px solid var(--color-border-strong);color:var(--color-text);border-radius:var(--radius-md);min-height:40px;font:inherit;transition:border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);padding:10px 12px}._field_h6ex3_329 input:focus,._field_h6ex3_329 select:focus,._field_h6ex3_329 textarea:focus{border-color:var(--color-primary);box-shadow:var(--focus-ring);outline:none}._commandList_h6ex3_359{gap:4px;max-height:min(40vh,280px);margin-top:4px;display:grid;overflow:auto}._commandItem_h6ex3_367{text-align:left;background:var(--color-panel-low);color:var(--color-text);cursor:pointer;font:inherit;border:1px solid #0000;border-radius:10px;padding:10px 12px}._commandItem_h6ex3_367:hover,._commandItem_h6ex3_367:focus-visible,._commandItemActive_h6ex3_380{border-color:var(--line-primary);background:var(--wash-primary);color:var(--color-primary-soft)}._commandEmpty_h6ex3_386{color:var(--color-text-muted);margin:8px 0 0;font-size:.9rem}._modalSection_h6ex3_392{margin:16px 0 4px}._modalSection_h6ex3_392 h3{font-family:var(--font-body);letter-spacing:.08em;text-transform:uppercase;color:var(--color-text-muted);margin:0 0 8px;font-size:.75rem;font-weight:700}._onboardHero_h6ex3_406{justify-content:center;margin-bottom:12px;display:flex}._onboardModal_h6ex3_412{width:min(540px,100%);max-height:calc(100dvh - 48px);overflow-y:auto}._onboardProgress_h6ex3_418{grid-template-columns:repeat(7,1fr);gap:4px;margin-bottom:16px;display:grid}._onboardSeg_h6ex3_425,._onboardSegDone_h6ex3_426{border-radius:var(--radius-full);background:var(--color-border);height:4px}._onboardSegDone_h6ex3_426{background:var(--color-primary)}._onboardEyebrow_h6ex3_436{letter-spacing:.08em;text-transform:uppercase;color:var(--color-accent);margin-bottom:6px;font-size:.72rem;font-weight:600}._onboardHint_h6ex3_445{color:var(--color-text-dim);margin:0;font-size:.8rem}._onboardQuick_h6ex3_451{border:1px dashed var(--color-border-strong);border-radius:var(--radius-md);background:var(--color-panel-low);gap:8px;margin-top:16px;padding:14px;font-size:.9rem;display:grid}._onboardPlan_h6ex3_462{border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-panel-low);grid-template-columns:max-content 1fr;gap:8px 16px;margin:8px 0 12px;padding:14px;font-size:.9rem;display:grid}._onboardPlan_h6ex3_462 dt{color:var(--color-text-muted)}._onboardPlan_h6ex3_462 dd{margin:0;font-weight:600}._onboardPlanSteps_h6ex3_483{color:var(--color-text-muted);gap:4px;margin:0 0 8px;padding-left:18px;font-size:.88rem;display:grid}._crashScreen_h6ex3_492{z-index:80;background:var(--color-scrim);place-items:center;padding:24px;display:grid;position:fixed;inset:0}._crashTitle_h6ex3_502{font-family:var(--font-display);margin:0 0 8px;font-size:1.15rem}._fallbackBtn_h6ex3_508,._fallbackBtnPrimary_h6ex3_509{font:inherit;cursor:pointer;border-radius:10px;padding:10px 14px}._fallbackBtn_h6ex3_508{border:1px solid var(--color-border);color:var(--color-text);background:0 0}._fallbackBtnPrimary_h6ex3_509{background:var(--color-primary);border:1px solid var(--color-primary);color:var(--color-on-primary)}._modalMeta_h6ex3_528{color:var(--color-text-muted);gap:4px;margin:12px 0;font-size:.8rem;display:grid}._modalError_h6ex3_536{color:var(--color-error);font-size:.85rem}._modalActions_h6ex3_541{flex-wrap:wrap;justify-content:flex-end;gap:8px;margin-top:8px;display:flex}._scrollModal_h6ex3_549{overscroll-behavior:contain;width:min(440px,100%);max-height:calc(100dvh - 32px);overflow-y:auto}._streakSlot_h6ex3_556{flex-shrink:0;max-width:42vw;display:inline-flex}._streakSlot_h6ex3_556>span{max-width:100%;overflow:hidden}@media (width<=1024px) and (width>=721px){._shell_h6ex3_1{grid-template-columns:72px minmax(0,1fr)}._brand_h6ex3_27{justify-content:center;padding:0 0 8px}._brandText_h6ex3_46,._sidebarFoot_h6ex3_97,._navItem_h6ex3_71 span{display:none}._logoMark_h6ex3_34{width:36px;height:36px}._navItem_h6ex3_71{justify-content:center;padding:10px 8px}}@media (width<=720px){._shell_h6ex3_1{grid-template-columns:minmax(0,1fr);grid-template-rows:var(--topbar-h) minmax(0, 1fr) var(--bottom-nav-h);grid-template-areas:"topbar""main""sidebar"}._sidebar_h6ex3_16{padding:4px 6px;padding-bottom:max(4px, env(safe-area-inset-bottom));border-right:none;border-top:1px solid var(--color-border);flex-direction:row;align-items:stretch;gap:0;overflow:hidden}._brand_h6ex3_27,._sidebarFoot_h6ex3_97{display:none}._nav_h6ex3_63{flex-direction:row;flex:1;gap:2px;overflow:hidden}._navItem_h6ex3_71{white-space:normal;text-align:center;overflow-wrap:anywhere;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:2px;min-width:0;padding:6px 2px;font-size:10px;line-height:1.15}._navItem_h6ex3_71 span{text-overflow:ellipsis;max-width:100%;overflow:hidden}._navItemActive_h6ex3_91{background:var(--wash-primary);color:var(--color-primary-soft)}._topbar_h6ex3_186{padding:0 var(--main-pad)}._searchPill_h6ex3_198{max-width:none}._main_h6ex3_235{padding:var(--main-pad)}._modalBackdrop_h6ex3_291{padding:12px}._modal_h6ex3_291{padding:16px}._kbd_h6ex3_263{display:none}}@media (width<=480px){._shell_h6ex3_1{--bottom-nav-h:64px}._nav_h6ex3_63{overscroll-behavior-x:contain;scrollbar-width:none;gap:0;overflow:auto hidden}._nav_h6ex3_63::-webkit-scrollbar{display:none}._navItem_h6ex3_71{flex:0 0 72px;min-height:48px;padding:4px 4px 6px}._navItem_h6ex3_71 span{-webkit-line-clamp:2;line-clamp:2;white-space:normal;-webkit-box-orient:vertical;max-height:2.3em;font-size:10px;line-height:1.15;display:-webkit-box;overflow:hidden}._topbar_h6ex3_186{padding-inline:max(10px, env(safe-area-inset-left)) max(10px, env(safe-area-inset-right));gap:8px}._streakSlot_h6ex3_556{display:none}._modalActions_h6ex3_541{flex-direction:column-reverse;align-items:stretch}._modalActions_h6ex3_541>*{width:100%}._scrollModal_h6ex3_549{max-height:calc(100dvh - 16px)}}._guideBackdrop_h6ex3_736{overflow:hidden}._modal_h6ex3_291._guideModal_h6ex3_740{flex-direction:column;width:min(520px,100%);max-height:min(680px,100dvh - 32px);padding:0;display:flex;overflow:hidden}._guideHead_h6ex3_749{flex:none;justify-content:space-between;align-items:flex-start;gap:12px;padding:16px 16px 0;display:flex}._guideHead_h6ex3_749 h2{font-family:var(--font-display);margin:0;font-size:1.2rem}._guideScroll_h6ex3_764{overscroll-behavior:contain;flex:auto;min-height:0;padding:8px 16px 12px;overflow-y:auto}._guideLead_h6ex3_772{color:var(--color-text-muted);margin:0 0 12px;font-size:.92rem}._guideList_h6ex3_778{gap:8px;margin:0;padding:0;list-style:none;display:grid}._guideItem_h6ex3_786{border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-panel-low);grid-template-columns:32px minmax(0,1fr);align-items:start;gap:10px;padding:10px 12px;display:grid}._guideIcon_h6ex3_797{background:var(--wash-primary);width:32px;height:32px;color:var(--color-primary-soft);border-radius:8px;place-items:center;display:grid}._guideItem_h6ex3_786 strong{font-family:var(--font-body);font-size:.92rem;font-weight:600;display:block}._guideItem_h6ex3_786 p{color:var(--color-text-muted);margin:2px 0 0;font-size:.86rem;line-height:1.45}._guideFoot_h6ex3_821{border-top:1px solid var(--color-border);flex:none;justify-content:flex-end;gap:8px;padding:12px 16px;display:flex}@media (width<=640px){._guideBackdrop_h6ex3_736{place-items:end stretch;padding:0}._modal_h6ex3_291._guideModal_h6ex3_740{width:100%;max-height:calc(100dvh - env(safe-area-inset-top));border-radius:16px 16px 0 0}._guideFoot_h6ex3_821{padding-bottom:calc(12px + env(safe-area-inset-bottom))}._guideFoot_h6ex3_821>*{flex:auto}._guideHead_h6ex3_749 h2{font-size:1.15rem}}._wrap_1wf0d_1{color:inherit;cursor:inherit;background:0 0;border:0;flex-direction:column;align-items:center;gap:8px;padding:0;display:inline-flex}button._wrap_1wf0d_1{cursor:pointer}._img_1wf0d_17{object-fit:contain;pointer-events:none;display:block}._speech_1wf0d_23{background:var(--color-card);border:1px solid var(--color-border);max-width:240px;color:var(--color-text);box-shadow:var(--shadow-sm);border-radius:12px 12px 12px 4px;padding:8px 12px;font-size:.88rem}._bob_1wf0d_34{animation:_nazaBob_1wf0d_1 1.6s var(--ease) infinite}@keyframes _nazaBob_1wf0d_1{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}._overlay_1wf0d_48{z-index:90;background:var(--color-scrim);place-items:center;padding:16px;display:grid;position:fixed;inset:0}._overlayInMain_1wf0d_59{inset:var(--topbar-h) 0 0 var(--sidebar-w)}@media (width<=1024px) and (width>=721px){._overlayInMain_1wf0d_59{inset:var(--topbar-h) 0 0 72px}}@media (width<=720px){._overlayInMain_1wf0d_59{inset:var(--topbar-h) 0 var(--bottom-nav-h) 0}}._overlayCard_1wf0d_75{background:var(--color-card);border:1px solid var(--color-border-card);border-radius:var(--radius-xl);text-align:center;width:min(400px,100%);box-shadow:var(--shadow-card);padding:clamp(16px,3vw,22px)}._overlayTitle_1wf0d_85{font-family:var(--font-display);margin:12px 0 8px;font-size:1.35rem}._overlayLead_1wf0d_91{color:var(--color-text-muted)}._shimmer_1wf0d_95{background:repeating-linear-gradient(90deg, var(--color-primary) 0 12px, transparent 12px 20px);background-size:32px 3px;border-radius:999px;height:3px;margin-top:20px;animation:.8s linear infinite _dash_1wf0d_1}@keyframes _dash_1wf0d_1{to{background-position:32px 0}}@media (prefers-reduced-motion:reduce){._bob_1wf0d_34,._shimmer_1wf0d_95{animation:none}}._group_1e122_1{border-radius:var(--radius-md);border:1px solid var(--color-border-strong);background:var(--color-panel-low);align-items:center;gap:2px;padding:3px;display:inline-flex}._option_1e122_11{color:var(--color-text-muted);font:inherit;cursor:pointer;background:0 0;border:0;border-radius:8px;min-height:30px;padding:4px 10px;font-size:.8rem;font-weight:600;line-height:1.2}._option_1e122_11:hover{color:var(--color-text)}._option_1e122_11[aria-checked=true]{background:var(--color-card);color:var(--color-text);box-shadow:var(--shadow-sm)}._option_1e122_11:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px}._page_1frw7_7{--gutter:168px;--rule:36px;--ruling:#1c274013;background:var(--color-bg);scroll-behavior:smooth;width:100%;height:100%;overflow:hidden auto}._top_1frw7_22{z-index:5;background:color-mix(in srgb, var(--color-bg) 88%, transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--color-border-card);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:10px clamp(14px,3vw,36px);display:flex;position:sticky;top:0}._brand_1frw7_37{border-radius:var(--radius-md);align-items:center;gap:10px;display:inline-flex}._brand_1frw7_37:focus-visible,._link_1frw7_45:focus-visible{outline:2px solid var(--color-focus);outline-offset:3px}._brand_1frw7_37 img{background:var(--color-card);border:1.5px solid var(--color-border-card);box-shadow:0 3px 0 0 color-mix(in srgb, var(--color-gold) 55%, var(--color-border-card));border-radius:50%}._brandName_1frw7_57{font-family:var(--font-display);font-size:1.2rem;font-weight:700}._brandSub_1frw7_63{font-family:var(--font-mono);color:var(--color-text-muted);border-left:1px solid var(--color-border-strong);padding-left:10px;font-size:.72rem}._topActions_1frw7_71{align-items:center;gap:8px;display:flex}._topBtn_1frw7_77{padding:8px 14px;font-size:.9rem}._book_1frw7_84{max-width:1240px;margin:0 auto;padding:0 clamp(16px,3vw,40px);position:relative}._book_1frw7_84:before{content:none}._hero_1frw7_95,._feature_1frw7_96,._account_1frw7_97,._language_1frw7_98{grid-template-columns:var(--gutter) minmax(0, 1fr);column-gap:16px;display:grid;position:relative}._margin_1frw7_105{font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--color-accent);text-align:right;grid-column:1;padding-top:6px;padding-right:22px;font-size:.74rem;font-weight:500;line-height:1.4}._hero_1frw7_95{padding:calc(var(--rule) * 2) 0 calc(var(--rule) * 2);row-gap:calc(var(--rule) * 1.5)}._heroText_1frw7_126{max-width:820px;animation:_rise_1frw7_1 .52s var(--ease) both;grid-column:2}._subjects_1frw7_132{font-family:var(--font-mono);color:var(--color-secondary-soft);font-size:.8rem;line-height:var(--rule);flex-wrap:wrap;gap:6px 18px;display:flex}._title_1frw7_142{font-family:var(--font-display);letter-spacing:-.02em;text-wrap:balance;max-width:17ch;margin-top:8px;font-size:clamp(2.1rem,4.6vw,3.6rem);font-weight:700;line-height:1.2}._lead_1frw7_154{margin-top:calc(var(--rule) / 2);max-width:62ch;color:var(--color-text-muted);font-size:1.12rem;line-height:1.65}._ctas_1frw7_162{margin-top:var(--rule);flex-wrap:wrap;gap:10px;display:flex}._cta_1frw7_162{padding:12px 22px;font-size:1rem}._fine_1frw7_174{color:var(--color-text-muted);margin-top:10px;font-size:.85rem}._heroPrint_1frw7_180{animation:_rise_1frw7_1 .64s .12s var(--ease) both;grid-column:2}._print_1frw7_187{background:var(--color-card-high);border:1px solid var(--color-border-card);border-radius:var(--radius-md);box-shadow:var(--shadow-card);margin:0;padding:8px}._print_1frw7_187 img{border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-bg);width:100%;height:auto;display:block}._print_1frw7_187 figcaption{font-family:var(--font-mono);color:var(--color-text-muted);padding:8px 4px 2px;font-size:.74rem}._feature_1frw7_96{grid-template-columns:var(--gutter) minmax(0, .8fr) minmax(0, 1.2fr);padding:calc(var(--rule) * 1.5) 0;border-top:1px solid var(--color-border);align-items:start}._feature_1frw7_96>._featureText_1frw7_221{grid-column:2}._feature_1frw7_96>._print_1frw7_187{grid-column:3}._featureText_1frw7_221{padding-right:12px}._h2_1frw7_233{font-family:var(--font-display);text-wrap:balance;margin-bottom:12px;font-size:clamp(1.35rem,2.2vw,1.75rem);font-weight:700;line-height:1.3}._h2_1frw7_233:after{content:"";background:var(--color-gold);border-radius:999px;width:36px;height:3px;margin-top:10px;display:block}._body_1frw7_252{color:var(--color-text-muted);max-width:56ch;font-size:1rem;line-height:1.65}._account_1frw7_97,._language_1frw7_98{padding:calc(var(--rule) * 1.5) 0;border-top:1px solid var(--color-border)}._accountBody_1frw7_267,._languageBody_1frw7_268{grid-column:2}._points_1frw7_272{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:24px 0 0;display:grid}._point_1frw7_272{background:var(--color-card);border:1px solid var(--color-border-card);border-radius:var(--radius-md);box-shadow:var(--shadow-card);padding:14px 16px}._point_1frw7_272 dt{font-family:var(--font-mono);letter-spacing:.04em;text-transform:uppercase;color:var(--color-primary-soft);margin-bottom:6px;font-size:.78rem;font-weight:500}._point_1frw7_272 dd{color:var(--color-text);margin:0;font-size:.95rem;line-height:1.5}._closing_1frw7_306{text-align:center;padding:calc(var(--rule) * 2) 0 calc(var(--rule) * 2.5);border-top:1px solid 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var(--color-border-card);background:var(--color-card);box-shadow:var(--shadow-card);border-radius:12px;flex-direction:column;flex-shrink:0;gap:6px;padding:8px 10px;display:flex}._practiceTrackCompact_1fbi4_534{margin-top:2px}._practiceBestLockedInline_1fbi4_538{color:var(--color-text-muted);font-size:.85rem;font-weight:600}._practiceMain_1fbi4_544{flex-direction:column;flex:1;min-height:0;display:flex;overflow:hidden}._practiceMain_1fbi4_544>*{flex:1;min-height:0;overflow:auto}._practiceQMeta_1fbi4_558{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;display:flex}._practiceStem_1fbi4_566{margin:4px 0;font-size:.98rem;font-weight:600;line-height:1.4}._practiceFigures_1fbi4_573{flex-wrap:wrap;gap:6px;margin:2px 0 6px;display:flex}._practiceFigure_1fbi4_573{max-width:100%;margin:0}._practiceFigure_1fbi4_573 img{object-fit:contain;border:1px solid var(--color-border);background:var(--color-card);border-radius:10px;width:auto;max-width:min(100%,360px);height:auto;max-height:110px;display:block}._optionStackCompact_1fbi4_598{grid-template-columns:1fr 1fr;gap:8px;margin-top:6px;display:grid}._optionStackCompact_1fbi4_598 ._optionBtn_1fbi4_605,._optionStackCompact_1fbi4_598 ._answerSelected_1fbi4_606,._optionStackCompact_1fbi4_598 ._answerCorrect_1fbi4_607,._optionStackCompact_1fbi4_598 ._answerWrong_1fbi4_608{overflow-wrap:anywhere;word-break:break-word;align-self:stretch;width:100%;min-height:44px;padding:10px 12px;font-size:.92rem;line-height:1.35}._practiceActions_1fbi4_619{flex-shrink:0;gap:8px;margin-top:8px;display:flex}@media (width<=900px){._practiceHudRow_1fbi4_351{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=720px){._practiceHudRow_1fbi4_351{grid-template-columns:1fr 1fr}._practiceDots_1fbi4_316{gap:4px}._practicePage_1fbi4_469{height:auto;max-height:100%;overflow:auto}._practiceFigure_1fbi4_573 img{max-height:100px}._optionStackCompact_1fbi4_598,._optionStack_1fbi4_598{grid-template-columns:1fr 1fr;gap:6px}}@media (width<=420px){._optionStackCompact_1fbi4_598,._optionStack_1fbi4_598{grid-template-columns:1fr}}._list_1fbi4_665{flex-direction:column;gap:10px;display:flex}._listItem_1fbi4_671{border-bottom:1px solid var(--color-border);justify-content:space-between;gap:12px;padding:12px 0;display:flex}._listItem_1fbi4_671:last-child{border-bottom:none}._tutorLayout_1fbi4_684{gap:var(--space-4);flex:1;grid-template-columns:minmax(0,1fr) minmax(200px,260px);width:100%;height:100%;min-height:0;max-height:100%;display:grid;overflow:hidden}._chatPane_1fbi4_696{background:var(--color-card);border:1px solid var(--color-border-card);border-radius:var(--radius-xl);box-shadow:var(--shadow-card);flex-direction:column;min-width:0;height:100%;min-height:0;max-height:100%;display:flex;overflow:hidden}._chatHeader_1fbi4_710{border-bottom:1px solid var(--color-border);flex-shrink:0;justify-content:space-between;align-items:center;padding:8px 10px;display:flex}._messages_1fbi4_719{flex-direction:column;flex:auto;gap:8px;min-height:0;padding:10px;display:flex;overflow:hidden auto}._bubbleUser_1fbi4_730,._bubbleAi_1fbi4_731{border-radius:14px;max-width:85%;padding:10px 14px;line-height:1.55}._bubbleUser_1fbi4_730{background:var(--color-card-high);border:1px solid var(--color-border);white-space:pre-wrap;word-break:break-word;border-top-right-radius:6px;align-self:flex-end}._bubbleAi_1fbi4_731{background:var(--color-panel-low);border:1px solid var(--color-border);border-left:3px solid var(--color-secondary);word-break:break-word;border-top-left-radius:6px;align-self:flex-start}._bubbleAi_1fbi4_731 .katex-display{max-width:100%;margin:.5em 0;padding:.2em 0;overflow-x:auto}._bubbleAi_1fbi4_731 .katex{font-size:1.05em}._composer_1fbi4_767{border-top:1px solid var(--color-border);background:var(--color-card);z-index:6;flex:none;align-items:flex-end;gap:8px;padding:8px 10px;display:flex;position:sticky;bottom:0}._composer_1fbi4_767 input,._composer_1fbi4_767 textarea{flex:1;min-width:0;max-height:72px}._sourcesPane_1fbi4_787{flex-direction:column;gap:10px;min-width:0;height:100%;min-height:0;max-height:100%;display:flex;overflow-y:auto}._citeCard_1fbi4_798{font-size:13px}._citeMeta_1fbi4_802{color:var(--color-text-muted);margin-top:4px;font-size:12px}._answerGrid_1fbi4_809{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-top:20px;display:grid}._answerCard_1fbi4_816{text-align:left;border-radius:var(--radius-lg);border:1px solid var(--color-border);background:var(--color-card);color:var(--color-text);cursor:pointer;transition:border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);padding:18px}._answerCard_1fbi4_816:hover{border-color:var(--line-primary)}._answerKey_1fbi4_832{font-family:var(--font-display);color:var(--color-primary-soft);margin-right:8px;font-weight:700}._answerSelected_1fbi4_606{border-color:var(--color-primary);background:var(--wash-primary);box-shadow:none;color:var(--color-text);font-weight:600}._optionStack_1fbi4_598 ._answerSelected_1fbi4_606,._optionStack_1fbi4_598 ._answerCorrect_1fbi4_607,._optionStack_1fbi4_598 ._answerWrong_1fbi4_608{text-align:left;border:1px solid var(--color-border);cursor:pointer;border-radius:12px;padding:12px 14px}._answerCorrect_1fbi4_607{border-color:var(--color-success);background:var(--wash-success)}._answerWrong_1fbi4_608{border-color:var(--color-error);background:var(--wash-error)}._flashcard_1fbi4_868{text-align:center;min-height:180px;font-size:18px;font-family:var(--font-display);cursor:pointer;background:var(--color-card);place-items:center;display:grid}._heat_1fbi4_880{grid-template-columns:repeat(7,1fr);gap:6px;display:grid}._heatCell_1fbi4_886{aspect-ratio:1;background:var(--color-panel-low);border:1px solid var(--color-border);border-radius:6px}._empty_1fbi4_893{text-align:center;color:var(--color-secondary);padding:28px 16px 24px}._empty_1fbi4_893:before{content:"";background:var(--color-gold);border-radius:999px;width:36px;height:3px;margin:0 auto 14px;display:block}._lessonView_1fbi4_910{flex-direction:column;flex:1;min-height:0;display:flex;overflow:hidden}._lessonTop_1fbi4_918{border-bottom:1px solid var(--color-border);flex-direction:column;gap:8px;padding:10px 12px 8px;display:flex}._lessonTitle_1fbi4_926{font-family:var(--font-display);margin-top:4px;font-size:18px;line-height:1.25}._lessonProgressTrack_1fbi4_933{background:var(--color-panel-low);border-radius:999px;height:4px;overflow:hidden}._lessonProgressFill_1fbi4_940{background:var(--color-primary);height:100%;transition:width .3s var(--ease);border-radius:999px}._lessonBody_1fbi4_947{flex:auto;min-height:0;padding:20px 16px calc(24px + 6.5rem);overflow:hidden auto}._lessonStepPanel_1fbi4_958{outline:none;max-width:62ch;margin:0 auto}._lessonIntroRow_1fbi4_964{align-items:flex-start;gap:16px;display:flex}._lessonLead_1fbi4_970{margin:0;line-height:1.7}._diagramImg_1fbi4_975{border-radius:12px;max-width:100%;display:block}._figCap_1fbi4_981{margin-top:8px}._lessonCheckActions_1fbi4_985,._lessonHint_1fbi4_989{margin-top:12px}._lessonFeedbackText_1fbi4_993{margin-top:14px;line-height:1.65}._localNote_1fbi4_998{margin-top:8px;font-size:12px}._flashMeta_1fbi4_1003{margin-bottom:10px;font-size:12px;display:block}._lessonKeysHint_1fbi4_1009{align-self:center;font-size:12px}._lessonCardCurrent_1fbi4_1014{box-shadow:var(--shadow-card), inset 3px 0 0 var(--color-primary);border-color:var(--line-primary)}._tutorEmpty_1fbi4_1019{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:12px;padding:24px 16px;display:flex}._tutorStatus_1fbi4_1030{color:var(--color-text-muted);flex-shrink:0;margin:0 12px 8px;font-size:.9rem}._tutorPreparing_1fbi4_1037{border:1px solid var(--color-border-card);background:var(--color-card);max-width:min(100%,420px);box-shadow:var(--shadow-card);border-radius:14px;align-self:flex-start;align-items:flex-start;gap:12px;margin:4px 0 8px;padding:12px 14px;display:flex}._tutorPreparingCopy_1fbi4_1051{gap:4px;min-width:0;display:grid}._tutorPreparingTitle_1fbi4_1057{color:var(--color-text);align-items:center;gap:8px;margin:0;font-size:.98rem;font-weight:600;display:inline-flex}._tutorPreparingLead_1fbi4_1067{color:var(--color-text-muted);margin:0;font-size:.85rem;line-height:1.4}._tutorDots_1fbi4_1074{align-items:center;gap:4px;display:inline-flex}._tutorDots_1fbi4_1074 span{background:var(--color-primary);border-radius:50%;width:6px;height:6px;animation:1.2s ease-in-out infinite _tutorDotPulse_1fbi4_1}._tutorDots_1fbi4_1074 span:nth-child(2){animation-delay:.2s}._tutorDots_1fbi4_1074 span:nth-child(3){animation-delay:.4s}@keyframes _tutorDotPulse_1fbi4_1{0%,80%,to{opacity:.35;transform:translateY(0)}40%{opacity:1;transform:translateY(-2px)}}._tutorPreparingBar_1fbi4_1109{border-top:1px solid var(--color-border);background:var(--color-bg);color:var(--color-text);flex-shrink:0;align-items:center;gap:10px;padding:8px 12px;font-size:.9rem;font-weight:600;display:flex}._tutorPreparingBarLead_1fbi4_1122{color:var(--color-text-muted);font-size:.82rem;font-weight:500}._tutorPreparingShimmer_1fbi4_1128{background:linear-gradient(90deg, transparent, color-mix(in srgb, var(--color-primary) 45%, transparent), transparent);background-size:200% 100%;flex-shrink:0;height:3px;animation:1.4s linear infinite _tutorShimmer_1fbi4_1}@keyframes _tutorShimmer_1fbi4_1{0%{background-position:100% 0}to{background-position:-100% 0}}@media (prefers-reduced-motion:reduce){._tutorDots_1fbi4_1074 span,._tutorPreparingShimmer_1fbi4_1128{animation:none}._tutorDots_1fbi4_1074 span{opacity:.8}}._chatPane_1fbi4_696>._banner_1fbi4_1161{border-left:none;border-right:none;border-radius:0;flex-shrink:0;margin:0}._citeTopic_1fbi4_1169{overflow-wrap:anywhere;font-weight:600}._lessonStack_1fbi4_1174{flex-direction:column;gap:12px;display:flex}._sectionBodyStack_1fbi4_1180{flex-direction:column;gap:12px;margin-top:12px;display:flex}._sectionBody_1fbi4_132{margin:12px 0 0;font-size:1.02rem;line-height:1.8}._sectionBody_1fbi4_132 .katex-display,._practiceStem_1fbi4_566 .katex-display,._lessonFeedbackText_1fbi4_993 .katex-display{max-width:100%;overflow-x:auto}._sectionBodyStack_1fbi4_1180 ._sectionBody_1fbi4_132{margin-top:0}._lessonList_1fbi4_1205{color:var(--color-text);margin:12px 0 0;padding-left:1.2rem;line-height:1.55}._lessonList_1fbi4_1205 li+li{margin-top:8px}._lessonAnswerBox_1fbi4_1216{border-radius:var(--radius-lg);border:1px solid color-mix(in srgb, var(--color-success) 45%, transparent);background:var(--wash-success);margin-top:14px;padding:12px 14px}._diagramPlaceholder_1fbi4_1224{text-align:center;color:var(--color-text-muted);border:1px dashed var(--color-border-strong);background:var(--color-panel-low);border-radius:16px;margin-top:14px;padding:28px 16px;font-size:13px}._lessonFlash_1fbi4_1235{border:1px solid var(--color-border-card);width:100%;box-shadow:var(--shadow-card);color:var(--color-text)}._lessonControls_1fbi4_1242{z-index:30;left:var(--sidebar-w);padding:8px 12px;padding-bottom:max(8px, env(safe-area-inset-bottom));border-top:1px solid var(--color-border);background:var(--color-panel-low);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;display:flex;position:fixed;bottom:0;right:0}._lessonBuilding_1fbi4_1259{flex:1;place-items:center;min-height:0;padding:28px 18px;display:grid}._lessonBuildingCard_1fbi4_1267{width:min(100%,440px);position:relative;overflow:hidden}._lessonBuildingPulse_1fbi4_1273{background:linear-gradient(110deg, transparent 30%, color-mix(in srgb, var(--color-primary) 8%, transparent) 50%, transparent 70%);pointer-events:none;background-size:200% 100%;animation:1.6s ease-in-out infinite _lessonShimmer_1fbi4_1;position:absolute;inset:0}@keyframes _lessonShimmer_1fbi4_1{0%{background-position:100% 0}to{background-position:-100% 0}}._stack_1fbi4_1296{gap:12px;display:grid}._activityList_1fbi4_1301{gap:10px;margin:0;padding:0;list-style:none;display:grid}._pageTitle_1fbi4_1309{font-family:var(--font-display);margin:2px 0 6px;font-size:clamp(1.25rem,2.2vw,1.7rem)}._pageTitle_1fbi4_1309:after{content:"";background:var(--color-gold);border-radius:999px;width:36px;height:3px;margin-top:8px;display:block}._fieldBlock_1fbi4_503{color:var(--color-text-muted);flex-direction:column;gap:4px;font-size:.88rem;display:flex}._fieldBlock_1fbi4_503 select,._fieldBlock_1fbi4_503 input{background:var(--color-panel-low);border:1px solid var(--color-border);width:100%;max-width:100%;color:var(--color-text);border-radius:10px;min-height:36px;padding:8px 10px}._optionStack_1fbi4_598{grid-template-columns:1fr 1fr;gap:8px;margin-top:14px;display:grid}._optionBtn_1fbi4_605{text-align:left;border:1px solid var(--color-border);background:var(--color-panel-low);color:var(--color-text);cursor:pointer;overflow-wrap:anywhere;word-break:break-word;border-radius:12px;width:100%;min-height:44px;padding:12px 14px}._optionBtn_1fbi4_605:hover:not(:disabled){border-color:var(--line-primary)}._feedbackBlock_1fbi4_1370{border-top:1px solid var(--color-border);gap:6px;margin-top:16px;padding-top:12px;display:grid}._cbtPage_1fbi4_1378{flex-direction:column;gap:8px;height:100%;min-height:0;display:flex;overflow:hidden}._cbtTopBar_1fbi4_1387{border:1px solid var(--color-border-card);border-radius:var(--radius-md);background:var(--color-card);box-shadow:var(--shadow-card);z-index:20;flex-wrap:wrap;flex-shrink:0;justify-content:space-between;align-items:center;gap:6px 10px;padding:6px 10px;display:flex;position:sticky;top:0}._cbtTopLeft_1fbi4_1404{gap:0;font-size:.82rem;line-height:1.25;display:grid}._cbtTopLeft_1fbi4_1404 strong{font-family:var(--font-display);letter-spacing:.02em;font-size:.92rem}._cbtTopActions_1fbi4_1417{flex-wrap:wrap;align-items:center;gap:4px;display:flex}._cbtTopActions_1fbi4_1417 button{min-height:32px;padding:4px 10px;font-size:.85rem}._cbtTimer_1fbi4_1430{font-variant-numeric:tabular-nums;color:var(--color-gold-ink);background:var(--wash-gold);border:1px solid var(--line-gold);border-radius:8px;align-items:center;gap:6px;padding:4px 8px;font-size:.92rem;font-weight:700;display:inline-flex}._cbtTimer_1fbi4_1430[data-urgent=true]{color:var(--color-error);background:var(--wash-error);border-color:color-mix(in srgb, var(--color-error) 55%, var(--color-card));animation:1s ease-in-out infinite _cbtPulse_1fbi4_1}@keyframes _cbtPulse_1fbi4_1{0%,to{opacity:1}50%{opacity:.72}}@media (prefers-reduced-motion:reduce){._cbtTimer_1fbi4_1430[data-urgent=true],._lessonBuildingPulse_1fbi4_1273{animation:none}}._cbtNotice_1fbi4_1468{border:1px solid var(--line-gold);background:var(--wash-gold);color:var(--color-text-muted);border-radius:10px;margin:0;padding:10px 12px;font-size:.9rem}._cbtShell_1fbi4_1478{flex:1;grid-template-columns:minmax(160px,210px) minmax(0,1fr);align-items:stretch;gap:10px;min-height:0;display:grid;overflow:hidden}._cbtSide_1fbi4_1488{border:1px solid var(--color-border-card);border-radius:var(--radius-lg);background:var(--color-card);min-height:0;box-shadow:var(--shadow-card);padding:10px;overflow:auto}._cbtPalette_1fbi4_1498{grid-template-columns:repeat(5,1fr);gap:6px;display:grid}._cbtPalBtn_1fbi4_1504{aspect-ratio:1;border:1px solid var(--color-border);background:var(--color-panel-low);color:var(--color-text-muted);cursor:pointer;border-radius:8px;font-size:.88rem;font-weight:600}._cbtPalBtn_1fbi4_1504:hover{border-color:var(--line-primary)}._cbtPalBtnActive_1fbi4_1519{border-color:var(--color-primary);color:var(--color-primary-soft);background:var(--wash-primary)}._cbtPalBtnAnswered_1fbi4_1525{background:var(--wash-success);color:var(--color-success)}._cbtPalBtnFlagged_1fbi4_1530{box-shadow:inset 0 0 0 1px var(--color-gold)}._cbtLegend_1fbi4_1534{color:var(--color-text-muted);gap:6px;margin-top:12px;font-size:.75rem;display:grid}._cbtLegend_1fbi4_1534 span{align-items:center;gap:6px;display:inline-flex}._cbtLegend_1fbi4_1534 i{border-radius:3px;width:10px;height:10px;display:inline-block}._dotAnswered_1fbi4_1555{background:var(--color-success)}._dotFlagged_1fbi4_1559{background:var(--color-gold)}._dotCurrent_1fbi4_323{background:var(--color-primary)}._cbtMain_1fbi4_1567{min-width:0;min-height:0;overflow:auto}._cbtQuestionCard_1fbi4_1573{gap:12px;display:grid}._cbtPassage_1fbi4_1578{border:1px solid var(--color-border);background:var(--color-panel-low);border-radius:12px;max-height:200px;padding:14px 16px;overflow:auto}._cbtPassage_1fbi4_1578 p{white-space:pre-wrap;margin:8px 0 0;font-size:1rem;line-height:1.65}._cbtStem_1fbi4_1594{margin:0;font-size:1.12rem;font-weight:600;line-height:1.55}._cbtFigure_1fbi4_1601{gap:6px;margin:0;display:grid}._cbtFigure_1fbi4_1601 img{object-fit:contain;border:1px solid var(--color-border);background:var(--color-card);border-radius:10px;width:min(100%,520px);max-height:220px}._cbtFigure_1fbi4_1601 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