@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swap";
:root{--primary-50:#f3e8ff;--primary-100:#e9d5ff;--primary-200:#d8b4fe;--primary-300:#c084fc;--primary-400:#a855f7;--primary-500:#8b5cf6;--primary-600:#7c3aed;--primary-700:#6d28d9;--primary-800:#5b21b6;--primary-900:#4c1d95;--accent-50:#fffbeb;--accent-100:#fef3c7;--accent-200:#fde68a;--accent-300:#fcd34d;--accent-400:#fbbf24;--accent-500:#f59e0b;--accent-600:#d97706;--success-400:#4ade80;--success-500:#22c55e;--success-600:#16a34a;--error-400:#f87171;--error-500:#ef4444;--error-600:#dc2626;--gray-50:#fafafa;--gray-100:#f4f4f5;--gray-200:#e4e4e7;--gray-300:#d4d4d8;--gray-400:#a1a1aa;--gray-500:#71717a;--gray-600:#52525b;--gray-700:#3f3f46;--gray-800:#27272a;--gray-850:#1e1e22;--gray-900:#18181b;--gray-950:#0d0d10;--bg-primary:#0a0a12;--bg-secondary:#12121c;--bg-card:#1e1e2d99;--bg-card-hover:#28283cb3;--bg-glass:#ffffff0a;--bg-glass-strong:#ffffff14;--border-subtle:#ffffff0f;--border-default:#ffffff1a;--border-strong:#ffffff26;--border-glow:#8b5cf666;--text-primary:#f4f4f5;--text-secondary:#a1a1aa;--text-tertiary:#71717a;--text-inverse:#18181b;--font-sans:"Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-display:"Space Grotesk", "Inter", sans-serif;--space-xs:4px;--space-sm:8px;--space-md:16px;--space-lg:24px;--space-xl:32px;--space-2xl:48px;--space-3xl:64px;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--shadow-sm:0 2px 8px #0000004d;--shadow-md:0 4px 16px #0006;--shadow-lg:0 8px 32px #00000080;--shadow-glow:0 0 20px #8b5cf64d;--shadow-glow-accent:0 0 20px #fbbf244d;--shadow-glow-success:0 0 20px #22c55e4d;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-base:.25s cubic-bezier(.4, 0, .2, 1);--transition-slow:.4s cubic-bezier(.4, 0, .2, 1);--transition-spring:.5s cubic-bezier(.34, 1.56, .64, 1);--z-nav:100;--z-modal:200;--z-toast:300}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;scroll-behavior:smooth;font-size:16px}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);min-height:100dvh;line-height:1.6;overflow-x:hidden}body:before{content:"";pointer-events:none;z-index:0;background:radial-gradient(80% 60% at 20% 10%,#8b5cf61f 0%,#0000 60%),radial-gradient(60% 40% at 80% 90%,#fbbf240f 0%,#0000 50%);position:fixed;inset:0}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit;background:0 0;border:none;font-family:inherit}input,textarea,select{font-family:inherit}img{max-width:100%;display:block}ul,ol{list-style:none}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;padding:var(--space-lg);background:#000000b3;justify-content:center;align-items:center;animation:.2s fadeIn;display:flex;position:fixed;inset:0}.modal-card{width:100%;max-width:420px;max-height:80vh;animation:.3s slideUp;overflow-y:auto}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:700;line-height:1.2}h1{font-size:clamp(1.75rem,4vw,2.5rem)}h2{font-size:clamp(1.375rem,3vw,1.875rem)}h3{font-size:clamp(1.125rem,2.5vw,1.5rem)}h4{font-size:1.125rem}h5{font-size:1rem}.text-gradient{background:linear-gradient(135deg, var(--primary-300), var(--accent-400));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.text-sm{font-size:.875rem}.text-xs{font-size:.75rem}.text-lg{font-size:1.125rem}.container{width:100%;max-width:1200px;padding:0 var(--space-md);margin:0 auto}.page-content{z-index:1;min-height:100dvh;padding-bottom:80px;position:relative}@media (min-width:1024px){.page-content{padding-bottom:0;padding-left:240px}}.card{background:var(--bg-card);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:var(--space-lg);transition:all var(--transition-base)}.card:hover{background:var(--bg-card-hover);border-color:var(--border-default)}.card-glow{box-shadow:var(--shadow-glow);border-color:var(--border-glow)}.card-glass{background:var(--bg-glass);-webkit-backdrop-filter:blur(24px);border:1px solid var(--border-subtle);border-radius:var(--radius-lg)}.btn{justify-content:center;align-items:center;gap:var(--space-sm);border-radius:var(--radius-md);transition:all var(--transition-base);padding:12px 24px;font-size:.9375rem;font-weight:600;display:inline-flex;position:relative;overflow:hidden}.btn-primary{background:linear-gradient(135deg, var(--primary-600), var(--primary-700));color:#fff;box-shadow:var(--shadow-sm), 0 0 0 0 #8b5cf600}.btn-primary:hover{background:linear-gradient(135deg, var(--primary-500), var(--primary-600));box-shadow:var(--shadow-md), var(--shadow-glow);transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--bg-glass-strong);color:var(--text-primary);border:1px solid var(--border-default)}.btn-secondary:hover{border-color:var(--border-strong);background:#ffffff1f}.btn-accent{background:linear-gradient(135deg, var(--accent-500), var(--accent-600));color:var(--text-inverse)}.btn-accent:hover{background:linear-gradient(135deg, var(--accent-400), var(--accent-500));box-shadow:var(--shadow-md), var(--shadow-glow-accent);transform:translateY(-1px)}.btn-ghost{color:var(--text-secondary);background:0 0}.btn-ghost:hover{background:var(--bg-glass);color:var(--text-primary)}.btn-sm{padding:8px 16px;font-size:.8125rem}.btn-lg{padding:16px 32px;font-size:1.0625rem}.btn-full{width:100%}.btn-icon{border-radius:var(--radius-md);width:40px;height:40px;padding:0}.input-group{gap:var(--space-sm);flex-direction:column;display:flex}.input-group label{color:var(--text-secondary);font-size:.875rem;font-weight:500}.input{background:var(--bg-glass);border:1px solid var(--border-default);border-radius:var(--radius-md);width:100%;color:var(--text-primary);transition:all var(--transition-fast);outline:none;padding:12px 16px;font-size:1rem}.input:focus{border-color:var(--primary-500);background:var(--bg-glass-strong);box-shadow:0 0 0 3px #8b5cf626}.input::placeholder{color:var(--text-tertiary)}.badge{border-radius:var(--radius-full);letter-spacing:.02em;align-items:center;gap:4px;padding:4px 10px;font-size:.75rem;font-weight:600;display:inline-flex}.badge-primary{color:var(--primary-300);background:#8b5cf626;border:1px solid #8b5cf633}.badge-accent{color:var(--accent-300);background:#fbbf2426;border:1px solid #fbbf2433}.badge-success{color:var(--success-400);background:#22c55e26;border:1px solid #22c55e33}.badge-error{color:var(--error-400);background:#ef444426;border:1px solid #ef444433}.progress-bar{background:var(--bg-glass-strong);border-radius:var(--radius-full);width:100%;height:6px;overflow:hidden}.progress-bar-fill{border-radius:var(--radius-full);background:linear-gradient(90deg, var(--primary-500), var(--accent-400));height:100%;transition:width var(--transition-slow)}.range-slider{appearance:none;background:var(--bg-glass-strong);border-radius:var(--radius-full);width:100%;height:6px;transition:all var(--transition-fast);outline:none}.range-slider::-webkit-slider-thumb{appearance:none;background:linear-gradient(135deg, var(--primary-400), var(--primary-600));cursor:pointer;width:24px;height:24px;transition:all var(--transition-fast);border-radius:50%;box-shadow:0 0 10px #8b5cf666}.range-slider::-webkit-slider-thumb:hover{transform:scale(1.2);box-shadow:0 0 16px #8b5cf699}.range-slider::-moz-range-thumb{background:linear-gradient(135deg, var(--primary-400), var(--primary-600));cursor:pointer;border:none;border-radius:50%;width:24px;height:24px;box-shadow:0 0 10px #8b5cf666}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(30px)}to{opacity:1;transform:translate(0)}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-30px)}to{opacity:1;transform:translate(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-8px)}40%{transform:translate(8px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}}@keyframes confetti-fall{0%{opacity:1;transform:translateY(-100vh)rotate(0)}to{opacity:0;transform:translateY(100vh)rotate(720deg)}}@keyframes glow-pulse{0%,to{box-shadow:0 0 20px #8b5cf64d}50%{box-shadow:0 0 40px #8b5cf699}}@keyframes count-up{0%{opacity:0;transform:scale(.5)}to{opacity:1;transform:scale(1)}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.animate-fade-in{animation:fadeIn var(--transition-base) ease-out}.animate-fade-in-up{animation:fadeInUp var(--transition-slow) ease-out}.animate-fade-in-down{animation:fadeInDown var(--transition-slow) ease-out}.animate-slide-right{animation:slideInRight var(--transition-slow) ease-out}.animate-slide-left{animation:slideInLeft var(--transition-slow) ease-out}.animate-scale-in{animation:scaleIn var(--transition-spring) ease-out}.animate-pulse{animation:2s infinite pulse}.animate-float{animation:3s ease-in-out infinite float}.animate-shake{animation:.5s ease-in-out shake}.animate-glow{animation:2s ease-in-out infinite glow-pulse}.animate-spin{animation:1s linear infinite spin}.stagger-children>*{animation:.4s ease-out both fadeInUp}.stagger-children>:first-child{animation-delay:0s}.stagger-children>:nth-child(2){animation-delay:60ms}.stagger-children>:nth-child(3){animation-delay:.12s}.stagger-children>:nth-child(4){animation-delay:.18s}.stagger-children>:nth-child(5){animation-delay:.24s}.stagger-children>:nth-child(6){animation-delay:.3s}.stagger-children>:nth-child(7){animation-delay:.36s}.stagger-children>:nth-child(8){animation-delay:.42s}.skeleton{background:linear-gradient(90deg, var(--bg-glass) 25%, var(--bg-glass-strong) 50%, var(--bg-glass) 75%);border-radius:var(--radius-md);background-size:200% 100%;animation:1.5s ease-in-out infinite shimmer}.holographic{position:relative;overflow:hidden}.holographic:after{content:"";pointer-events:none;background:linear-gradient(45deg,#0000 30%,#ffffff0d 40%,#ffffff1a 50%,#ffffff0d 60%,#0000 70%);width:200%;height:200%;animation:3s ease-in-out infinite shimmer;position:absolute;top:-50%;left:-50%}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--gray-700);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--gray-600)}.auth-page{min-height:100dvh;padding:var(--space-md);z-index:1;justify-content:center;align-items:center;display:flex;position:relative}.auth-card{width:100%;max-width:420px;padding:var(--space-2xl);text-align:center}.auth-logo{font-family:var(--font-display);margin-bottom:var(--space-sm);font-size:2.5rem;font-weight:800}.auth-subtitle{color:var(--text-secondary);margin-bottom:var(--space-2xl);font-size:.9375rem}.auth-form{gap:var(--space-md);flex-direction:column;display:flex}.auth-toggle{margin-top:var(--space-lg);color:var(--text-secondary);font-size:.875rem}.auth-toggle button{color:var(--primary-400);font-weight:600;text-decoration:underline}.auth-error{color:var(--error-400);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);background:#ef44441a;border:1px solid #ef444433;font-size:.875rem}.dashboard{padding:var(--space-lg) var(--space-md);max-width:900px;margin:0 auto}.dashboard-header{margin-bottom:var(--space-xl);justify-content:space-between;align-items:center;gap:var(--space-md);display:flex}.greeting h1{margin-bottom:4px;font-size:clamp(1.5rem,3.5vw,2rem)}.greeting p{color:var(--text-secondary);font-size:.9375rem}.stats-row{gap:var(--space-md);margin-bottom:var(--space-xl);grid-template-columns:repeat(3,1fr);display:grid}.stat-card{padding:var(--space-md);text-align:center}.stat-value{font-family:var(--font-display);font-size:1.5rem;font-weight:700}.stat-label{color:var(--text-secondary);margin-top:2px;font-size:.75rem}.stat-icon{margin-bottom:4px;font-size:1.25rem}.continue-card{border:1px solid var(--border-glow);margin-bottom:var(--space-xl);position:relative;overflow:hidden}.continue-card:before{content:"";background:linear-gradient(90deg, var(--primary-500), var(--accent-400));height:3px;position:absolute;top:0;left:0;right:0}.section-title{margin-bottom:var(--space-md);align-items:center;gap:var(--space-sm);font-size:1.125rem;font-weight:600;display:flex}.setup-tabs{gap:var(--space-xs);margin-bottom:var(--space-lg);background:var(--bg-glass);border-radius:var(--radius-lg);border:1px solid var(--border-subtle);padding:4px;display:flex}.setup-tab{padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-base);text-align:center;background:0 0;border:none;flex:1;font-size:.9375rem;font-weight:600}.setup-tab:hover{color:var(--text-primary)}.setup-tab.active{background:var(--primary-500);color:#fff;box-shadow:var(--shadow-md)}.tab-content{animation:.3s ease-out fadeInUp}.difficulty-grid{gap:var(--space-sm);margin-bottom:var(--space-xl);grid-template-columns:repeat(2,1fr);display:grid}.difficulty-option{padding:var(--space-md);border-radius:var(--radius-lg);background:var(--bg-glass);border:2px solid var(--border-subtle);cursor:pointer;transition:all var(--transition-base);text-align:center}.difficulty-option:hover{background:var(--bg-glass-strong);border-color:var(--border-default)}.difficulty-option.selected{border-color:var(--primary-500);box-shadow:var(--shadow-glow);background:#8b5cf61a}.difficulty-emoji{margin-bottom:var(--space-xs);font-size:2rem;display:block}.difficulty-name{font-size:.875rem;font-weight:600}.difficulty-desc{color:var(--text-tertiary);margin-top:2px;font-size:.75rem}.training-toggle{padding:var(--space-md);background:var(--bg-glass);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);margin-bottom:var(--space-md);justify-content:space-between;align-items:center;display:flex}.toggle-switch{background:var(--gray-700);border-radius:var(--radius-full);cursor:pointer;width:48px;height:26px;transition:all var(--transition-base);position:relative}.toggle-switch.active{background:var(--primary-600)}.toggle-switch:after{content:"";width:20px;height:20px;transition:all var(--transition-base);background:#fff;border-radius:50%;position:absolute;top:3px;left:3px}.toggle-switch.active:after{left:25px}.slider-section{margin-bottom:var(--space-xl)}.slider-header{margin-bottom:var(--space-md);justify-content:space-between;align-items:center;display:flex}.slider-value{font-family:var(--font-display);color:var(--primary-400);font-size:1.25rem;font-weight:700}.slider-labels{margin-top:var(--space-xs);justify-content:space-between;padding:0 12px;display:flex}.slider-labels span{color:var(--text-tertiary);font-size:.6875rem}.topic-grid{gap:var(--space-md);margin-bottom:var(--space-xl);flex-wrap:wrap;display:flex}.topic-chip{padding:var(--space-sm) var(--space-md);border-radius:var(--radius-full);background:var(--bg-glass);border:1px solid var(--border-subtle);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-base);text-align:center;white-space:nowrap;font-size:.8125rem}.topic-chip:hover{background:var(--bg-glass-strong);border-color:var(--border-default)}.topic-chip.selected{border-color:var(--primary-500);color:var(--primary-300);background:#8b5cf626}.start-section{padding:var(--space-md) 0;z-index:10;position:sticky;bottom:80px}@media (min-width:1024px){.start-section{bottom:var(--space-lg)}}.quiz-back-btn{margin-bottom:var(--space-sm);color:var(--text-secondary);padding:var(--space-xs) var(--space-sm);margin-left:-var(--space-sm);transition:color var(--transition-fast), background var(--transition-fast);z-index:50;align-self:flex-start;font-weight:600}.quiz-back-btn:hover{color:var(--text-primary);background:var(--bg-glass-strong)}@media (min-width:1100px){.quiz-back-btn{top:var(--space-xl);left:var(--space-xl);margin:0;position:fixed}}.quiz-page{max-width:700px;padding:var(--space-sm) var(--space-md);flex-direction:column;min-height:100dvh;max-height:100dvh;margin:0 auto;display:flex;overflow:hidden}.quiz-header{padding:var(--space-sm) 0;margin-bottom:var(--space-sm);flex-shrink:0;justify-content:space-between;align-items:center;display:flex}.quiz-header-left{align-items:center;gap:var(--space-md);display:flex}.quiz-progress-text{color:var(--text-secondary);font-size:.875rem}.quiz-score{align-items:center;gap:var(--space-xs);font-family:var(--font-display);color:var(--accent-400);font-weight:700;display:flex}.question-section{min-height:0;padding-bottom:var(--space-sm);flex-direction:column;flex:1;animation:.4s ease-out fadeInUp;display:flex;overflow-y:auto}.question-meta{gap:var(--space-sm);margin-bottom:var(--space-xs);flex-wrap:wrap;display:flex}.question-text{margin-bottom:var(--space-md);font-size:clamp(1.125rem,2.5vw,1.25rem);font-weight:600;line-height:1.4}.answers-grid{gap:var(--space-xs);margin-bottom:var(--space-md);flex-direction:column;display:flex}.answer-option{align-items:center;gap:var(--space-sm);padding:parseInt(var(--space-sm)) var(--space-md);background:var(--bg-glass);border:2px solid var(--border-subtle);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-base);text-align:left;width:100%;color:var(--text-primary);padding:10px 14px;font-size:1rem;display:flex}.answer-option:hover:not(.disabled){background:var(--bg-glass-strong);border-color:var(--border-default);transform:translate(4px)}.answer-option.selected{border-color:var(--primary-500);background:#8b5cf61a}.answer-option.correct{border-color:var(--success-500);box-shadow:var(--shadow-glow-success);background:#22c55e1a}.answer-option.wrong{border-color:var(--error-500);background:#ef44441a;animation:.5s ease-in-out shake}.answer-option.disabled{cursor:default;opacity:.6}.answer-option.disabled.correct{opacity:1}.answer-letter{border-radius:var(--radius-sm);background:var(--bg-glass-strong);flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:.875rem;font-weight:700;display:flex}.answer-option.correct .answer-letter{background:var(--success-500);color:#fff}.answer-option.wrong .answer-letter{background:var(--error-500);color:#fff}.hint-btn{align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-full);color:var(--accent-400);transition:all var(--transition-base);margin-bottom:var(--space-lg);background:#fbbf241a;border:1px solid #fbbf2433;font-size:.875rem;font-weight:500;display:flex}.hint-btn:hover{background:#fbbf2426;transform:translateY(-1px)}.hint-btn:disabled{opacity:.5;cursor:not-allowed}.hint-panel{border-radius:var(--radius-lg);padding:var(--space-md);margin-bottom:var(--space-lg);background:#fbbf240f;border:1px solid #fbbf2426;animation:.3s ease-out fadeInDown}.hint-panel p{color:var(--accent-300);font-size:.9375rem;line-height:1.6}.explanation-panel{border-radius:var(--radius-md);padding:var(--space-md);margin-top:var(--space-sm);animation:.4s ease-out fadeInUp}.explanation-panel.correct{background:#22c55e0f;border:1px solid #22c55e26}.explanation-panel.wrong{background:#ef44440f;border:1px solid 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