._header_1emep_1{background:var(--glass-bg);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border-bottom:1px solid var(--glass-border);position:sticky;top:0;z-index:var(--z-sticky)}._container_1emep_10{max-width:1400px;margin:0 auto;padding:var(--spacing-4) var(--spacing-6);display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-8)}._logo_1emep_20{display:flex;align-items:center;gap:var(--spacing-3);text-decoration:none;color:var(--color-text-primary)}._logoIcon_1emep_28{font-size:var(--font-size-2xl);font-weight:var(--font-weight-bold);background:var(--color-accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}._logoText_1emep_37{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold)}._nav_1emep_42{display:flex;gap:var(--spacing-6)}._navLink_1emep_47{color:var(--color-text-secondary);text-decoration:none;font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);transition:color var(--transition-fast)}._navLink_1emep_47:hover{color:var(--color-text-primary)}._dropdown_1emep_60{position:relative}._dropdown_1emep_60>._navLink_1emep_47{cursor:pointer}._dropdownContent_1emep_68{display:none;position:absolute;top:100%;left:50%;transform:translate(-50%);min-width:260px;padding-top:8px;z-index:var(--z-dropdown)}._dropdownContent_1emep_68:before{content:"";position:absolute;top:0;left:50%;transform:translate(-50%);width:100%;height:8px}._dropdownContent_1emep_68>a:first-child{border-radius:var(--radius-lg) var(--radius-lg) 0 0}._dropdownContent_1emep_68>a:last-child{border-radius:0 0 var(--radius-lg) var(--radius-lg)}._dropdown_1emep_60:hover ._dropdownContent_1emep_68{display:block}._dropdownLink_1emep_104{display:flex;align-items:center;gap:var(--spacing-3);padding:var(--spacing-3) var(--spacing-4);color:var(--color-text-secondary);text-decoration:none;font-size:var(--font-size-sm);transition:all var(--transition-fast);background:var(--glass-bg);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-bottom:none;box-shadow:0 4px 20px #0003}._dropdownLink_1emep_104:first-child{border-radius:var(--radius-lg) var(--radius-lg) 0 0}._dropdownLink_1emep_104:last-child{border-bottom:1px solid var(--glass-border);border-radius:0 0 var(--radius-lg) var(--radius-lg)}._dropdownLink_1emep_104:hover{background:#6366f11a;color:var(--color-text-primary)}._partNum_1emep_134{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:var(--radius-sm);background:var(--color-accent-gradient);color:#fff;font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);flex-shrink:0}._partRange_1emep_148{margin-left:auto;font-size:var(--font-size-xs);color:var(--color-text-muted)}._actions_1emep_154{display:flex;align-items:center;gap:var(--spacing-4)}._progress_1emep_160{display:flex;align-items:center;gap:var(--spacing-3)}._progressLabel_1emep_166{font-size:var(--font-size-xs);color:var(--color-text-muted)}._progressBar_1emep_171{width:120px;height:6px;background:var(--color-bg-tertiary);border-radius:var(--radius-full);overflow:hidden}._progressFill_1emep_179{height:100%;background:var(--color-accent-gradient);border-radius:var(--radius-full);transition:width var(--transition-slow)}._progressText_1emep_186{font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);color:var(--color-accent-primary);min-width:35px}@media(max-width:768px){._nav_1emep_42,._progressLabel_1emep_166{display:none}._progressBar_1emep_171{width:80px}._menuButton_1emep_204{display:flex}}._menuButton_1emep_204{display:none;align-items:center;justify-content:center;width:40px;height:40px;background:var(--color-bg-tertiary);border:none;border-radius:var(--radius-md);font-size:20px;color:var(--color-text-primary);cursor:pointer;transition:background .2s}._menuButton_1emep_204:hover{background:var(--color-bg-hover)}._authButton_1emep_230{background:var(--primary);color:#fff;border:none;padding:.5rem 1rem;border-radius:6px;font-weight:500;cursor:pointer;transition:background .2s}._authButton_1emep_230:hover{background:var(--primary-hover)}._userMenu_1emep_245{display:flex;align-items:center;gap:1rem}._userName_1emep_251{font-weight:500;color:var(--text-primary)}._menuLink_1emep_256{color:var(--text-secondary);text-decoration:none;font-size:.9rem;transition:color .2s}._menuLink_1emep_256:hover{color:var(--primary)}._logoutBtn_1emep_267{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:.9rem}._logoutBtn_1emep_267:hover{color:var(--danger)}._modalOverlay_1emep_280{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}._modalContent_1emep_291{background:var(--card-bg);padding:2rem;border-radius:12px;width:90%;max-width:400px;box-shadow:0 20px 60px #0000004d;border:1px solid var(--border)}._modalContent_1emep_291 h2{margin-bottom:1.5rem;text-align:center}._formGroup_1emep_306{margin-bottom:1rem}._formGroup_1emep_306 label{display:block;margin-bottom:.5rem;font-size:.9rem;color:var(--text-secondary)}._formGroup_1emep_306 input{width:100%;padding:.75rem;border:1px solid rgba(255,255,255,.2);border-radius:6px;background:#ffffff0d;color:var(--text);font-size:1rem;transition:border-color .2s,box-shadow .2s}._formGroup_1emep_306 input:hover{border-color:#ffffff4d}._formGroup_1emep_306 input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #6366f133}._formGroup_1emep_306 input::placeholder{color:#fff6}._modalActions_1emep_342{display:flex;gap:1rem;justify-content:flex-end;margin-top:2rem}._errorText_1emep_349{color:var(--danger);font-size:.9rem;margin-bottom:1rem;text-align:center}._mathBlock_eq6lz_1{background:var(--color-bg-secondary);border-left:3px solid var(--color-accent-primary);padding:var(--spacing-4) var(--spacing-6);margin:var(--spacing-4) 0;border-radius:0 var(--radius-lg) var(--radius-lg) 0;overflow-x:auto;font-size:1.1em}._mathInline_eq6lz_11{padding:0 var(--spacing-1)}.katex,.katex .mord,.katex .mop,.katex .mrel,.katex .mbin,.katex .minner{color:var(--color-text-primary)}._proofButton_7d2p4_1{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-2);padding:var(--spacing-1) var(--spacing-3);border:none;border-radius:var(--radius-md);background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;font-size:var(--font-size-sm);cursor:pointer;margin-left:var(--spacing-2);vertical-align:middle;transition:all .2s ease;box-shadow:0 2px 8px #6366f14d}._proofButton_7d2p4_1:hover{transform:scale(1.05);box-shadow:0 4px 12px #6366f180}._proofButton_7d2p4_1:active{transform:scale(.98)}._proofIcon_7d2p4_28{font-size:14px;line-height:1}._proofText_7d2p4_33{font-weight:var(--font-weight-medium);white-space:nowrap}._overlay_7d2p4_39{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:9999;padding:var(--spacing-4);animation:_fadeIn_7d2p4_1 .2s ease}@keyframes _fadeIn_7d2p4_1{0%{opacity:0}to{opacity:1}}._modal_7d2p4_63{background:linear-gradient(135deg,#1a1a2e,#16213e);border:1px solid rgba(99,102,241,.3);border-radius:var(--radius-xl);max-width:700px;width:100%;max-height:85vh;overflow:hidden;display:flex;flex-direction:column;box-shadow:0 20px 60px #00000080;animation:_slideUp_7d2p4_1 .3s ease}@keyframes _slideUp_7d2p4_1{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}._header_7d2p4_90{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-4) var(--spacing-5);border-bottom:1px solid rgba(255,255,255,.1);background:#6366f11a}._header_7d2p4_90 h3{margin:0;font-size:var(--font-size-lg);color:#fff}._closeButton_7d2p4_105{background:transparent;border:none;color:var(--color-text-muted);font-size:24px;cursor:pointer;padding:0;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all .15s ease}._closeButton_7d2p4_105:hover{background:#ffffff1a;color:#fff}._content_7d2p4_127{padding:var(--spacing-5);overflow-y:auto;flex:1}._step_7d2p4_134{display:flex;gap:var(--spacing-4);margin-bottom:var(--spacing-4);padding-bottom:var(--spacing-4);border-bottom:1px dashed rgba(255,255,255,.1)}._step_7d2p4_134:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}._stepNumber_7d2p4_148{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;font-size:var(--font-size-sm);font-weight:var(--font-weight-bold);display:flex;align-items:center;justify-content:center}._stepContent_7d2p4_162{flex:1;min-width:0}._explanation_7d2p4_167{margin:0 0 var(--spacing-2);color:var(--color-text-secondary);font-size:var(--font-size-sm);line-height:1.6}._mathContainer_7d2p4_174{background:#0000004d;border-radius:var(--radius-md);padding:var(--spacing-3);overflow-x:auto}._footer_7d2p4_182{padding:var(--spacing-3) var(--spacing-5);border-top:1px solid rgba(255,255,255,.1);text-align:right}._qed_7d2p4_188{font-family:Times New Roman,serif;font-style:italic;color:var(--color-success);font-size:var(--font-size-lg)}._sidebar_127fn_1{width:280px;background:var(--color-bg-secondary);border-right:1px solid var(--color-border);padding:var(--spacing-6);overflow-y:auto;height:calc(100vh - 72px);position:sticky;top:72px}._section_127fn_12{margin-bottom:var(--spacing-6)}._sectionTitle_127fn_16{font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--spacing-3);padding:0 var(--spacing-3)}._chapterList_127fn_26{list-style:none}._chapterLink_127fn_30{display:flex;align-items:center;gap:var(--spacing-3);padding:var(--spacing-3);border-radius:var(--radius-lg);text-decoration:none;color:var(--color-text-secondary);transition:all var(--transition-fast)}._chapterLink_127fn_30:hover{background:var(--color-bg-hover);color:var(--color-text-primary)}._chapterLink_127fn_30._active_127fn_46{background:#6366f11a;color:var(--color-accent-primary)}._chapterNumber_127fn_51{width:24px;height:24px;display:flex;align-items:center;justify-content:center;font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);background:var(--color-bg-tertiary);border-radius:var(--radius-md)}._chapterLink_127fn_30._active_127fn_46 ._chapterNumber_127fn_51{background:var(--color-accent-primary);color:#fff}._chapterTitle_127fn_68{flex:1;font-size:var(--font-size-sm);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}._chapterStatus_127fn_76{font-size:var(--font-size-xs);opacity:.5}._closeButton_127fn_81{display:none}@media(max-width:1024px){._sidebar_127fn_1{width:240px}}@media(max-width:768px){._sidebar_127fn_1{display:none;position:fixed;top:0;left:0;width:85%;max-width:320px;height:100vh;z-index:1000;padding-top:var(--spacing-8);padding-bottom:var(--spacing-8);box-shadow:4px 0 20px #0000004d;overflow-y:auto;-webkit-overflow-scrolling:touch}._sidebar_127fn_1._open_127fn_108{display:block;animation:_slideIn_127fn_1 .25s ease}@keyframes _slideIn_127fn_1{0%{transform:translate(-100%)}to{transform:translate(0)}}._closeButton_127fn_81{display:flex;position:absolute;top:var(--spacing-4);right:var(--spacing-4);width:36px;height:36px;align-items:center;justify-content:center;background:var(--color-bg-tertiary);border:none;border-radius:50%;font-size:18px;color:var(--color-text-primary);cursor:pointer}._closeButton_127fn_81:hover{background:var(--color-bg-hover)}}._layout_1n8x6_1{min-height:100vh;display:flex;flex-direction:column}._container_1n8x6_7{display:flex;flex:1}._main_1n8x6_12{flex:1;padding:var(--spacing-8);overflow-y:auto;background:var(--color-bg-primary)}._overlay_1n8x6_19{display:none}@media(max-width:768px){._container_1n8x6_7{flex-direction:column}._main_1n8x6_12{padding:var(--spacing-4)}._overlay_1n8x6_19{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:999}}._home_vvbs0_1{max-width:1000px;margin:0 auto}._hero_vvbs0_7{text-align:center;padding:var(--spacing-16) 0}._heroContent_vvbs0_12{max-width:700px;margin:0 auto}._title_vvbs0_17{font-size:3.5rem;font-weight:var(--font-weight-bold);line-height:1.1;margin-bottom:var(--spacing-6)}._highlight_vvbs0_24{background:var(--color-accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}._subtitle_vvbs0_31{font-size:var(--font-size-xl);color:var(--color-text-secondary);margin-bottom:var(--spacing-8);line-height:var(--line-height-relaxed)}._heroActions_vvbs0_38{display:flex;gap:var(--spacing-4);justify-content:center;margin-bottom:var(--spacing-12)}._loginPrompt_vvbs0_45{color:var(--color-text-secondary);font-size:var(--font-size-lg);background:var(--color-bg-card);padding:var(--spacing-4) var(--spacing-6);border-radius:var(--radius-lg);border:1px dashed var(--color-border)}._heroStats_vvbs0_54{display:flex;justify-content:center;gap:var(--spacing-12)}._stat_vvbs0_60{display:flex;flex-direction:column;align-items:center}._statNumber_vvbs0_66{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);color:var(--color-accent-primary)}._statLabel_vvbs0_72{font-size:var(--font-size-sm);color:var(--color-text-muted)}._features_vvbs0_78,._parts_vvbs0_79{padding:var(--spacing-12) 0}._sectionTitle_vvbs0_83{text-align:center;margin-bottom:var(--spacing-10)}._featureGrid_vvbs0_88{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-6)}._featureCard_vvbs0_94{text-align:center;padding:var(--spacing-8)}._featureIcon_vvbs0_99{font-size:2.5rem;margin-bottom:var(--spacing-4)}._featureCard_vvbs0_94 h3{margin-bottom:var(--spacing-3)}._featureCard_vvbs0_94 p{color:var(--color-text-secondary);font-size:var(--font-size-sm);margin:0}._partGrid_vvbs0_115{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-6)}._partCard_vvbs0_121{text-decoration:none;position:relative;overflow:hidden}._partCard_vvbs0_121:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--color-accent-gradient)}._partNumber_vvbs0_137{font-size:var(--font-size-4xl);font-weight:var(--font-weight-bold);color:var(--color-accent-primary);opacity:.5;margin-bottom:var(--spacing-2)}._partCard_vvbs0_121 h3{margin-bottom:var(--spacing-1)}._partCard_vvbs0_121>p{font-size:var(--font-size-sm);margin-bottom:var(--spacing-3)}._partDescription_vvbs0_154{font-size:var(--font-size-xs)!important;color:var(--color-text-muted)!important}@media(max-width:768px){._title_vvbs0_17{font-size:2.5rem}._featureGrid_vvbs0_88,._partGrid_vvbs0_115{grid-template-columns:1fr}._heroStats_vvbs0_54{gap:var(--spacing-6)}}._chapter_nsbdy_1{max-width:800px}._header_nsbdy_5{margin-bottom:var(--spacing-8)}._chapterLabel_nsbdy_9{display:inline-block;font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);color:var(--color-accent-primary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--spacing-2)}._header_nsbdy_5 h1{margin-bottom:var(--spacing-3)}._description_nsbdy_23{color:var(--color-text-secondary);margin:0}._progress_nsbdy_28{background:var(--color-bg-card);border-radius:var(--radius-lg);padding:var(--spacing-4);margin-bottom:var(--spacing-8)}._progressInfo_nsbdy_35{display:flex;justify-content:space-between;margin-bottom:var(--spacing-2);font-size:var(--font-size-sm)}._progressPercent_nsbdy_42{font-weight:var(--font-weight-semibold);color:var(--color-accent-primary)}._sections_nsbdy_47{display:flex;flex-direction:column;gap:var(--spacing-4)}._sectionCard_nsbdy_53{display:flex;align-items:center;gap:var(--spacing-4);text-decoration:none;padding:var(--spacing-5)}._sectionCard_nsbdy_53._locked_nsbdy_61{opacity:.6;pointer-events:none}._sectionCard_nsbdy_53._unlocked_nsbdy_66{border-left:3px solid var(--color-accent-primary)}._sectionNumber_nsbdy_70{width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--color-bg-tertiary);border-radius:var(--radius-lg);font-weight:var(--font-weight-semibold);color:var(--color-text-secondary)}._unlocked_nsbdy_66 ._sectionNumber_nsbdy_70{background:var(--color-accent-gradient);color:#fff}._sectionContent_nsbdy_87{flex:1}._sectionContent_nsbdy_87 h3{font-size:var(--font-size-base);margin-bottom:var(--spacing-1)}._sectionMeta_nsbdy_96{display:flex;align-items:center;gap:var(--spacing-3)}._time_nsbdy_102{font-size:var(--font-size-xs);color:var(--color-text-muted)}._sectionStatus_nsbdy_107{font-size:var(--font-size-xl);color:var(--color-text-muted)}._unlocked_nsbdy_66 ._sectionStatus_nsbdy_107{color:var(--color-accent-primary)}._gameContainer_pxg9e_1{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--spacing-6)}._gameHeader_pxg9e_8{margin-bottom:var(--spacing-4)}._gameType_pxg9e_12{display:inline-block;font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);color:var(--color-accent-primary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--spacing-1)}._gameTitle_pxg9e_22{font-size:var(--font-size-lg);margin:0}._instructions_pxg9e_27{background:var(--color-bg-secondary);border-radius:var(--radius-lg);padding:var(--spacing-4);margin-bottom:var(--spacing-6)}._instructions_pxg9e_27 p{margin:0;color:var(--color-text-secondary)}._gameArea_pxg9e_39{min-height:200px;margin-bottom:var(--spacing-6)}._feedback_pxg9e_44{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-4);border-radius:var(--radius-lg);margin-bottom:var(--spacing-4)}._feedback_pxg9e_44._success_pxg9e_53{background:#10b9811a;border:1px solid var(--color-success);color:var(--color-success)}._feedback_pxg9e_44._error_pxg9e_59{background:#ef44441a;border:1px solid var(--color-error);color:var(--color-error)}._score_pxg9e_65{font-weight:var(--font-weight-semibold)}._actions_pxg9e_69{display:flex;justify-content:flex-end;gap:var(--spacing-3)}._placeholder_pxg9e_75{display:flex;align-items:center;justify-content:center;min-height:150px;background:var(--color-bg-secondary);border-radius:var(--radius-lg);color:var(--color-text-muted)}._mcContainer_pxg9e_86,._numericContainer_pxg9e_87{display:flex;flex-direction:column}._gameHint_pxg9e_92{font-size:var(--font-size-sm);color:var(--color-accent-primary);font-weight:var(--font-weight-medium);margin-bottom:var(--spacing-3)}._mcOptions_pxg9e_99{display:flex;flex-direction:column;gap:var(--spacing-3)}._mcOption_pxg9e_99{display:block;width:100%;padding:var(--spacing-4);background:var(--color-bg-secondary);border:2px solid 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