@import url(https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap);body{-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;margin:0}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}*,:after,:before{box-sizing:border-box;margin:0;padding:0}:root{--bg:#080b11;--bg2:#0d1117;--bg3:#111827;--surface:#111827cc;--surface2:#1e293b99;--border:#6366f126;--border2:#ffffff0f;--indigo:#6366f1;--violet:#8b5cf6;--emerald:#10b981;--amber:#f59e0b;--rose:#f43f5e;--sky:#38bdf8;--grad:linear-gradient(135deg,#6366f1,#8b5cf6);--grad2:linear-gradient(135deg,#0ea5e9,#6366f1);--grad3:linear-gradient(135deg,#10b981,#0ea5e9);--t:#f8fafc;--t2:#94a3b8;--t3:#475569;--radius:16px;--radius-sm:10px;--radius-lg:24px;--shadow:0 4px 24px #0006;--shadow-lg:0 20px 60px #00000080;--shadow-glow:0 0 30px #6366f133;--font:"Inter",-apple-system,BlinkMacSystemFont,sans-serif}body{-webkit-font-smoothing:antialiased;background:#080b11;background:var(--bg);color:#f8fafc;color:var(--t);font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;font-family:var(--font);min-height:100vh;overflow-x:hidden}*,.auth-card,.auth-card *,.btn,.btn *,.file-upload,.file-upload *,.navbar,.navbar *,h1,h2,h3,h4,h5,h6{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important;text-shadow:none!important}*{color:inherit}.App{background:#080b11;background:var(--bg);min-height:100vh;position:relative}.App:before{background:radial-gradient(ellipse at 20% 0,#6366f11f 0,#0000 60%),radial-gradient(ellipse at 80% 100%,#8b5cf614 0,#0000 60%);content:"";inset:0;pointer-events:none;position:fixed;z-index:0}.main-content{margin:0 auto;max-width:1400px;width:100%;z-index:1}.card,.main-content{padding:2rem;position:relative}.card{backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);background:#111827cc;background:var(--surface);border:1px solid #6366f126;border:1px solid var(--border);border-radius:24px;border-radius:var(--radius-lg);box-shadow:0 4px 24px #0006;box-shadow:var(--shadow);margin-bottom:1.5rem;overflow:hidden;transition:box-shadow .3s ease,transform .3s ease}.card:before{background:linear-gradient(90deg,#0000,#6366f180,#0000);content:"";height:1px;left:0;position:absolute;right:0;top:0}.card:hover{box-shadow:0 20px 60px #00000080,0 0 30px #6366f133;box-shadow:var(--shadow-lg),var(--shadow-glow)}.card h2,.card h3{color:#f8fafc!important;color:var(--t)!important;font-weight:700;margin-bottom:1.25rem}.card h2{font-size:1.5rem}.card h3{font-size:1.2rem}.card:after{display:none!important}.navbar{align-items:center!important;animation:none!important;-webkit-backdrop-filter:blur(20px)!important;backdrop-filter:blur(20px)!important;background:#080b11e6!important;border-bottom:1px solid #ffffff0f!important;border-bottom:1px solid var(--border2)!important;border-radius:0!important;box-shadow:0 1px 0 #ffffff0f,0 4px 20px #0000004d!important;box-shadow:0 1px 0 var(--border2),0 4px 20px #0000004d!important;display:flex!important;height:64px;justify-content:space-between!important;margin-bottom:0!important;padding:0 2rem!important;position:-webkit-sticky!important;position:sticky!important;top:0!important;z-index:100!important}.navbar-brand{align-items:center;color:#f8fafc!important;color:var(--t)!important;display:flex;font-size:1.2rem!important;font-weight:800!important;gap:8px;letter-spacing:-.5px}.navbar-nav{align-items:center!important;display:flex!important;gap:4px!important;list-style:none!important}.nav-item{border-radius:10px!important;border-radius:var(--radius-sm)!important;color:#94a3b8!important;color:var(--t2)!important;cursor:pointer;font-size:.875rem!important;font-weight:500!important;padding:6px 14px!important;text-shadow:none!important;transition:all .2s ease!important}.nav-item:hover{background:#ffffff0f!important;box-shadow:none!important;color:#f8fafc!important;color:var(--t)!important;transform:none!important}.nav-item:before{display:none!important}.nav-item.active{background:linear-gradient(135deg,#6366f1,#8b5cf6)!important;background:var(--grad)!important;box-shadow:0 4px 12px #6366f14d!important;color:#fff!important;transform:none!important}.dark-mode-toggle{background:#1e293b99!important;background:var(--surface2)!important;border:1px solid #ffffff0f!important;border:1px solid var(--border2)!important;border-radius:10px!important;border-radius:var(--radius-sm)!important;color:#94a3b8!important;color:var(--t2)!important;cursor:pointer;font-size:1rem!important;padding:6px 10px!important;transition:all .2s!important}.dark-mode-toggle:hover{color:#f8fafc!important;color:var(--t)!important;transform:none!important}.user-name{background:#1e293b99!important;background:var(--surface2)!important;border:1px solid #ffffff0f!important;border:1px solid var(--border2)!important;border-radius:10px!important;border-radius:var(--radius-sm)!important;color:#94a3b8!important;color:var(--t2)!important;font-size:.875rem!important;font-weight:500!important;padding:6px 12px!important}.user-info{display:flex!important;gap:8px!important}.btn,.user-info{align-items:center!important}.btn{border:none!important;border-radius:10px!important;border-radius:var(--radius-sm)!important;cursor:pointer!important;display:inline-flex!important;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important;font-size:.875rem!important;font-weight:600!important;gap:6px;justify-content:center!important;letter-spacing:0;margin:4px!important;overflow:hidden;padding:9px 18px!important;position:relative;text-shadow:none!important;transition:all .2s ease!important}.btn:after,.btn:before{display:none!important}.btn-primary{background:linear-gradient(135deg,#6366f1,#8b5cf6)!important;background:var(--grad)!important;box-shadow:0 4px 12px #6366f14d!important;color:#fff!important}.btn-primary:hover{animation:none!important;box-shadow:0 6px 18px #6366f166!important;opacity:.9!important;transform:translateY(-1px)!important}.btn-secondary{background:#1e293b99!important;background:var(--surface2)!important;border:1px solid #ffffff0f!important;border:1px solid var(--border2)!important;box-shadow:none!important;color:#94a3b8!important;color:var(--t2)!important}.btn-secondary:hover{background:#ffffff14!important;box-shadow:none!important;color:#f8fafc!important;color:var(--t)!important;transform:translateY(-1px)!important}.btn-success{background:linear-gradient(135deg,#10b981,#059669)!important;box-shadow:0 4px 12px #10b9814d!important;color:#fff!important}.btn-success:hover{opacity:.9!important;transform:translateY(-1px)!important}.btn:disabled{box-shadow:none!important;cursor:not-allowed!important;opacity:.45!important;transform:none!important}.logout-btn{font-size:.8rem!important;padding:6px 14px!important}.loading{align-items:center!important;display:flex!important;flex-direction:column!important;gap:1rem!important;justify-content:center!important;padding:3rem!important}.loading:before{display:none!important}.loading p{color:#94a3b8!important;color:var(--t2)!important;font-size:.9rem!important;font-weight:400!important}.spinner{animation:spin .8s linear infinite!important;border:3px solid #6366f133!important;border-radius:50%!important;border-top:3px solid var(--indigo)!important;filter:none!important;height:40px!important;width:40px!important}@keyframes spin{to{transform:rotate(1turn)}}.loading-screen{align-items:center;background:#080b11;background:var(--bg);display:flex;justify-content:center;min-height:100vh}.file-upload{background:#6366f108!important;border:2px dashed #6366f14d!important;border-radius:16px!important;border-radius:var(--radius)!important;overflow:visible!important;padding:3rem 2rem!important;position:relative!important;text-align:center!important;transition:all .2s ease!important}.file-upload:after,.file-upload:before{display:none!important}.file-upload:hover{background:#6366f10f!important;border-color:#6366f180!important}.file-upload.dragover{background:#6366f11a!important;border-color:#6366f1!important;border-color:var(--indigo)!important;box-shadow:0 0 0 4px #6366f11a!important;transform:none!important}.file-upload p{color:#94a3b8!important;color:var(--t2)!important;font-size:.9rem!important}.file-input{background:#1e293b99!important;background:var(--surface2)!important;border:1px solid #ffffff0f!important;border:1px solid var(--border2)!important;border-radius:10px!important;border-radius:var(--radius-sm)!important;color:#f8fafc!important;color:var(--t)!important;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important;font-size:.875rem!important;margin:1rem 0!important;max-width:320px!important;padding:8px 12px!important;width:100%!important}.file-list{display:flex;flex-direction:column;gap:8px}.file-item{align-items:center!important;background:#1e293b99!important;background:var(--surface2)!important;border:1px solid #ffffff0f!important;border:1px solid var(--border2)!important;border-radius:10px!important;border-radius:var(--radius-sm)!important;cursor:pointer!important;display:flex!important;justify-content:space-between!important;overflow:visible!important;padding:14px 16px!important;transition:all .2s ease!important}.file-item:before{display:none!important}.file-item:hover{background:#6366f10f!important;border-color:#6366f159!important;box-shadow:0 4px 16px #6366f126!important;transform:none!important}.file-item.selected{background:#6366f11a!important;border-color:#6366f1!important;border-color:var(--indigo)!important;box-shadow:0 0 0 1px #6366f1!important;box-shadow:0 0 0 1px var(--indigo)!important;transform:none!important}.file-item.selected:before{display:none!important}.file-item div,.file-item span{color:inherit!important;font-size:.875rem!important;font-weight:400!important}.flashcard-container{align-items:center!important;display:flex!important;flex-direction:column!important;gap:2rem!important}.flashcard{height:320px!important;max-width:680px!important;perspective:1200px!important;width:100%!important}.flashcard-inner{cursor:pointer!important;height:100%!important;position:relative!important;transform-style:preserve-3d!important;transition:transform .7s cubic-bezier(.4,0,.2,1)!important;width:100%!important}.flashcard-inner.flipped{transform:rotateY(180deg)!important}.flashcard-back,.flashcard-front{align-items:center!important;-webkit-backface-visibility:hidden!important;backface-visibility:hidden!important;border:1px solid #6366f126!important;border:1px solid var(--border)!important;border-radius:24px!important;border-radius:var(--radius-lg)!important;display:flex!important;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important;font-size:1rem!important;font-weight:400!important;inset:0!important;justify-content:center!important;padding:2.5rem!important;position:absolute!important;text-align:center!important}.flashcard-front{background:linear-gradient(135deg,#6366f126,#8b5cf61a)!important;box-shadow:0 20px 60px #0006,0 0 40px #6366f126!important}.flashcard-back,.flashcard-front{color:#f8fafc!important;color:var(--t)!important}.flashcard-back{background:linear-gradient(135deg,#10b98126,#38bdf81a)!important;box-shadow:0 20px 60px #0006,0 0 40px #10b98126!important;transform:rotateY(180deg)!important}.flashcard-back div,.flashcard-back h3,.flashcard-back p,.flashcard-back span,.flashcard-front div,.flashcard-front h3,.flashcard-front p,.flashcard-front span{color:#f8fafc!important;color:var(--t)!important;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important;font-size:1rem!important;font-weight:400!important}.flashcard-back h3,.flashcard-front h3{font-size:.8rem!important;font-weight:600!important;letter-spacing:.08em!important;margin-bottom:1rem!important;opacity:.6!important;text-transform:uppercase!important}.flashcard-controls{align-items:center!important;display:flex!important;flex-wrap:wrap!important;gap:1rem!important;justify-content:center!important}.flashcard-counter{background:#1e293b99!important;background:var(--surface2)!important;border:1px solid #ffffff0f!important;border:1px solid var(--border2)!important;border-radius:10px!important;border-radius:var(--radius-sm)!important;color:#94a3b8!important;color:var(--t2)!important;font-size:.875rem!important;font-weight:600!important;padding:6px 16px!important;text-shadow:none!important}.flashcard-container .card:after{display:none!important}.quiz-container{margin:0 auto!important;max-width:900px!important}.quiz-container .card:after{display:none!important}.question-card{animation:none!important;margin-bottom:1.5rem!important}.question-title{color:#f8fafc!important;color:var(--t)!important;font-size:1rem!important;font-weight:600!important;line-height:1.5!important;margin-bottom:1rem!important}.options-list{display:flex!important;flex-direction:column!important;gap:8px!important;list-style:none!important;padding:0!important}.option-label{align-items:center!important;background:#1e293b99!important;background:var(--surface2)!important;border:1px solid #ffffff0f!important;border:1px solid var(--border2)!important;border-radius:10px!important;border-radius:var(--radius-sm)!important;color:#94a3b8!important;color:var(--t2)!important;cursor:pointer!important;display:flex!important;font-size:.9rem!important;font-weight:400!important;overflow:visible!important;padding:12px 16px!important;transition:all .15s ease!important}.option-label:before{display:none!important}.option-label:hover{background:#6366f112!important;border-color:#6366f166!important;box-shadow:none!important}.option-label.selected,.option-label:hover{color:#f8fafc!important;color:var(--t)!important;transform:none!important}.option-label.selected{background:#6366f126!important;border-color:#6366f1!important;border-color:var(--indigo)!important;box-shadow:0 0 0 1px #6366f14d!important}.option-input{accent-color:#6366f1!important;accent-color:var(--indigo)!important;margin-right:12px!important;transform:none!important}.quiz-results{animation:none!important;background:#1e293b99!important;background:var(--surface2)!important;border:1px solid #6366f126!important;border:1px solid var(--border)!important;border-radius:24px!important;border-radius:var(--radius-lg)!important;padding:2.5rem!important;text-align:center!important}.score{color:#f8fafc!important;color:var(--t)!important;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important;font-size:3.5rem!important;font-weight:800!important;margin-bottom:.5rem!important;text-shadow:none!important}.summary-container{margin:0 auto!important;max-width:1000px!important}.summary-container .card:after{display:none!important}.summary-content{color:#94a3b8!important;color:var(--t2)!important;font-size:.95rem!important;line-height:1.8!important;margin-bottom:1.5rem!important}.summary-container *{color:inherit!important;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important;font-weight:inherit!important}.topic-item{animation:none!important;background:#1e293b99!important;background:var(--surface2)!important;border:1px solid #ffffff0f!important;border-left:3px solid #6366f1!important;border:1px solid var(--border2)!important;border-left:3px solid var(--indigo)!important;border-radius:10px!important;border-radius:var(--radius-sm)!important;margin-bottom:1rem!important;padding:1.25rem 1.5rem!important;transition:border-color .2s!important}.topic-item:hover{border-left-color:#8b5cf6!important;border-left-color:var(--violet)!important;box-shadow:none!important;transform:none!important}.topic-title{color:#f8fafc!important;color:var(--t)!important;font-size:.95rem!important;font-weight:600!important;margin-bottom:.5rem!important}.topic-content{color:#94a3b8!important;color:var(--t2)!important;font-size:.875rem!important;line-height:1.65!important}.voice-controls{background:#1e293b99!important;background:var(--surface2)!important;border:1px solid #6366f126!important;border:1px solid var(--border)!important;border-radius:16px!important;border-radius:var(--radius)!important;margin-bottom:1.5rem!important;overflow:visible!important;padding:1.5rem!important}.voice-controls:before{animation:none!important;background:linear-gradient(135deg,#6366f1,#8b5cf6)!important;background:var(--grad)!important;height:2px!important}.voice-controls:after{display:none!important}.voice-controls:hover{box-shadow:none!important;transform:none!important}.voice-controls-header{align-items:center!important;display:flex!important;justify-content:space-between!important;margin-bottom:1rem!important}.voice-controls-header h3{color:#f8fafc!important;color:var(--t)!important;font-size:1rem!important;font-weight:600!important;margin:0!important}.sound-wave span{background:#6366f1!important;background:var(--indigo)!important}.slider-group label,.voice-select label{color:#94a3b8!important;color:var(--t2)!important;font-size:.8rem!important;font-weight:500!important}.voice-dropdown{background:#1e293b99!important;background:var(--surface2)!important;border-color:#ffffff0f!important;border-color:var(--border2)!important;color:#f8fafc!important;color:var(--t)!important;padding:7px 10px!important}.voice-btn,.voice-dropdown{font-size:.875rem!important}.voice-btn{padding:8px 16px!important}.btn-speaking{animation:none!important;background:linear-gradient(135deg,#6366f1,#8b5cf6)!important;background:linear-gradient(135deg,var(--indigo),var(--violet))!important}.voice-slider::-webkit-slider-thumb{background:#6366f1!important;background:var(--indigo)!important;box-shadow:none!important}.voice-slider::-moz-range-thumb{background:#6366f1!important;background:var(--indigo)!important;box-shadow:none!important}.progress-analytics{gap:1.5rem!important;margin:0 auto!important;max-width:1400px!important;padding:0!important}.progress-header{grid-gap:2rem!important;align-items:center!important;display:grid!important;gap:2rem!important;grid-template-columns:auto 1fr auto!important}.progress-header:before{height:2px!important}.level-badge,.progress-header:before{animation:none!important;background:linear-gradient(135deg,#6366f1,#8b5cf6)!important;background:var(--grad)!important}.level-badge{border-radius:10px!important;border-radius:var(--radius-sm)!important;box-shadow:none!important;padding:12px 16px!important}.level-number{color:#fff!important;font-size:.9rem!important;font-weight:700!important}.xp-bar{background:#fff3!important}.xp-fill{animation:none!important;background:linear-gradient(90deg,#fff9,#fff)!important}.xp-text{color:#fffc!important;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important;font-size:.75rem!important}.motivational-message h2{color:#f8fafc!important;color:var(--t)!important;font-size:1.3rem!important}.motivation-text{animation:none!important;color:#94a3b8!important;color:var(--t2)!important;font-size:.9rem!important}.motivation-text,.streak-number{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important}.streak-number{color:#f59e0b!important;color:var(--amber)!important;font-size:1.8rem!important;font-weight:800!important}.streak-label{color:#94a3b8!important;color:var(--t2)!important;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important;font-size:.8rem!important}.stats-overview{grid-gap:1rem!important;display:grid!important;gap:1rem!important;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))!important}.stat-card{align-items:center!important;display:flex!important;gap:1.25rem!important;padding:1.5rem!important}.stat-card:before{background:linear-gradient(135deg,#6366f1,#8b5cf6)!important;background:var(--grad)!important;width:3px!important}.stat-card:hover{box-shadow:0 20px 60px #00000080!important;box-shadow:var(--shadow-lg)!important;transform:translateY(-4px)!important}.stat-icon{animation:none!important;font-size:2.2rem!important}.stat-info h3{color:#f8fafc!important;color:var(--t)!important;font-size:2rem!important;margin:0 0 2px!important;text-shadow:none!important}.stat-info h3,.stat-info p{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important}.stat-info p{color:#94a3b8!important;color:var(--t2)!important;font-size:.8rem!important;font-weight:400!important;margin:0 0 10px!important}.progress-bar{background:#ffffff14!important;height:6px!important}.progress-fill{animation:none!important}.progress-fill.uploads{background:#6366f1!important;background:var(--indigo)!important}.progress-fill.summaries{background:#8b5cf6!important;background:var(--violet)!important}.progress-fill.flashcards{background:#10b981!important;background:var(--emerald)!important}.progress-fill.quizzes{background:#38bdf8!important;background:var(--sky)!important}.charts-section{grid-gap:1.5rem!important;align-items:start!important;display:grid!important;gap:1.5rem!important;grid-template-columns:2fr 2fr 1fr!important}.chart-card{border-radius:24px!important;border-radius:var(--radius-lg)!important;max-height:420px!important;overflow:hidden!important;padding:1.5rem!important}.chart-card:hover{transform:translateY(-3px)!important}.chart-card h3{font-size:1rem!important;font-weight:600!important;margin-bottom:1rem!important;text-align:center!important}.chart-card h3,.score-number{color:#f8fafc!important;color:var(--t)!important}.score-number{font-size:2rem!important;font-weight:800!important;text-shadow:none!important}.score-label,.score-number{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif!important;font-family:var(--font)!important}.score-label{color:#94a3b8!important;color:var(--t2)!important;font-size:.75rem!important}.achievements-section h3{font-size:1.25rem!important;text-align:left!important}.achievement-item{animation:none!important;background:#1e293b99!important;background:var(--surface2)!important;border-color:#ffffff0f!important;border-color:var(--border2)!important}.achievement-item:hover{transform:none!important}.achievement-item .achievement-icon{animation:none!important}.achievement-details h4{color:#f8fafc!important;color:var(--t)!important;font-size:.9rem!important}.achievement-details h4,.achievement-details 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