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191, 36, .15);--accent-error: #f87171;--accent-error-hover: #fca5a5;--accent-error-subtle: rgba(248, 113, 113, .15);--accent-info: #60a5fa;--accent-info-hover: #93c5fd;--accent-info-subtle: rgba(96, 165, 250, .15);--gradient-primary: linear-gradient(135deg, #a855f7 0%, #6366f1 100%);--gradient-primary-hover: linear-gradient(135deg, #c084fc 0%, #818cf8 100%);--gradient-accent: linear-gradient(135deg, #c084fc 0%, #f472b6 100%);--gradient-success: linear-gradient(135deg, #4ade80 0%, #22d3ee 100%);--gradient-dark: linear-gradient(180deg, #1a1225 0%, #0f0a1a 100%);--gradient-glow: radial-gradient(ellipse at center, rgba(168, 85, 247, .15) 0%, transparent 70%);--finger-pinky-left: #f472b6;--finger-ring-left: #fb923c;--finger-middle-left: #4ade80;--finger-index-left: #60a5fa;--finger-thumb: #a78bfa;--finger-index-right: #f472b6;--finger-middle-right: #2dd4bf;--finger-ring-right: #fbbf24;--finger-pinky-right: #a3e635;--key-default: #241830;--key-hover: #3d2d55;--key-active: #a855f7;--key-correct: #22c55e;--key-incorrect: #ef4444;--key-highlight: #a855f7;--key-gradient: linear-gradient(180deg, #2d2040 0%, #1a1225 100%);--key-border: #3d2d55;--key-shadow: 0 4px 0 #0f0a1a;--font-mono: "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 1.875rem;--font-size-4xl: 2.25rem;--font-size-5xl: 3rem;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--line-height-tight: 1.25;--line-height-normal: 1.5;--line-height-relaxed: 1.75;--letter-spacing-tight: -.025em;--letter-spacing-normal: 0;--letter-spacing-wide: .05em;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 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ease;--transition-normal: .2s ease;--transition-slow: .3s ease;--transition-slower: .5s ease;--transition-bounce: .5s cubic-bezier(.68, -.55, .265, 1.55);--transition-spring: .4s cubic-bezier(.175, .885, .32, 1.275);--z-dropdown: 100;--z-sticky: 200;--z-modal-backdrop: 300;--z-modal: 400;--z-tooltip: 500;--z-toast: 600;--sidebar-width: 260px;--header-height: 64px;--keyboard-max-width: 1000px;--content-max-width: 1400px;--key-size: 48px;--key-gap: 4px;--key-border-width: 1px}[data-theme=light],.theme-light{--bg-primary: #faf8fc;--bg-secondary: #f3f0f7;--bg-tertiary: #ebe6f2;--bg-elevated: #ffffff;--bg-overlay: rgba(250, 248, 252, .9);--bg-glass: rgba(255, 255, 255, .7);--bg-glass-hover: rgba(255, 255, 255, .85);--text-primary: #1a1225;--text-secondary: #5c5470;--text-muted: #8b8299;--text-inverse: #faf8fc;--text-accent: #9333ea;--border-primary: #e0dae8;--border-secondary: #ebe6f2;--border-focus: #9333ea;--border-glass: rgba(147, 51, 234, .2);--accent-primary: #9333ea;--accent-primary-hover: #a855f7;--accent-primary-active: #7c3aed;--accent-primary-glow: rgba(147, 51, 234, .3);--accent-primary-subtle: rgba(147, 51, 234, .08);--accent-secondary: #6366f1;--accent-secondary-hover: #818cf8;--accent-secondary-subtle: rgba(99, 102, 241, .08);--accent-tertiary: #a855f7;--accent-tertiary-hover: #c084fc;--accent-success: #22c55e;--accent-success-hover: #4ade80;--accent-success-subtle: rgba(34, 197, 94, .1);--accent-warning: #f59e0b;--accent-warning-hover: #fbbf24;--accent-warning-subtle: rgba(245, 158, 11, .1);--accent-error: #ef4444;--accent-error-hover: #f87171;--accent-error-subtle: rgba(239, 68, 68, .1);--accent-info: #3b82f6;--accent-info-hover: #60a5fa;--accent-info-subtle: rgba(59, 130, 246, .1);--gradient-primary: linear-gradient(135deg, #9333ea 0%, #6366f1 100%);--gradient-primary-hover: linear-gradient(135deg, #a855f7 0%, #818cf8 100%);--gradient-accent: linear-gradient(135deg, #a855f7 0%, #ec4899 100%);--gradient-success: 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var(--transition-normal)}.btn-primary:hover:not(:disabled){box-shadow:var(--shadow-lg),var(--shadow-glow);transform:translateY(-1px)}.btn-primary:hover:not(:disabled):before{opacity:1}.btn-primary span,.btn-primary svg{position:relative;z-index:1}.btn-secondary{background:var(--bg-glass);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);color:var(--text-primary);border:1px solid var(--border-primary)}.btn-secondary:hover:not(:disabled){background:var(--bg-glass-hover);border-color:var(--border-focus);box-shadow:var(--shadow-md)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover:not(:disabled){background:var(--accent-primary-subtle);color:var(--text-primary)}.btn-outline{background:transparent;color:var(--accent-primary);border:1px solid var(--accent-primary)}.btn-outline:hover:not(:disabled){background:var(--accent-primary-subtle);border-color:var(--accent-primary-hover)}.btn-danger{background:linear-gradient(135deg,var(--accent-error) 0%,#dc2626 100%);color:#fff;box-shadow:var(--shadow-md)}.btn-danger:hover:not(:disabled){box-shadow:var(--shadow-lg),0 0 20px #ef44444d;transform:translateY(-1px)}.btn-success{background:linear-gradient(135deg,var(--accent-success) 0%,#16a34a 100%);color:#fff;box-shadow:var(--shadow-md)}.btn-success:hover:not(:disabled){box-shadow:var(--shadow-lg),0 0 20px #4ade804d;transform:translateY(-1px)}.btn-warning{background:linear-gradient(135deg,var(--accent-warning) 0%,#d97706 100%);color:var(--text-inverse);box-shadow:var(--shadow-md)}.btn-warning:hover:not(:disabled){box-shadow:var(--shadow-lg),0 0 20px #fbbf244d;transform:translateY(-1px)}.btn-xs{padding:var(--space-1) var(--space-2);font-size:var(--font-size-xs);border-radius:var(--radius-sm)}.btn-sm{padding:var(--space-2) var(--space-3);font-size:var(--font-size-sm)}.btn-lg{padding:var(--space-4) var(--space-6);font-size:var(--font-size-base);border-radius:var(--radius-xl)}.btn-xl{padding:var(--space-5) var(--space-8);font-size:var(--font-size-lg);border-radius:var(--radius-xl)}.btn-icon{width:40px;height:40px;padding:0;border-radius:var(--radius-lg)}.btn-icon.btn-sm{width:32px;height:32px}.btn-icon.btn-lg{width:48px;height:48px}.btn-icon svg{width:20px;height:20px}.btn-icon.btn-sm svg{width:16px;height:16px}.btn-icon.btn-lg svg{width:24px;height:24px}.btn-icon-ghost{width:40px;height:40px;padding:0;background:transparent;color:var(--text-secondary);border-radius:var(--radius-lg)}.btn-icon-ghost:hover:not(:disabled){background:var(--accent-primary-subtle);color:var(--accent-primary)}.btn svg{width:18px;height:18px;flex-shrink:0}.btn-sm svg{width:16px;height:16px}.btn-lg svg{width:20px;height:20px}.btn-full{width:100%}.btn-group{display:inline-flex;border-radius:var(--radius-lg);overflow:hidden}.btn-group .btn{border-radius:0;border-right:1px solid rgba(255,255,255,.1)}.btn-group .btn:first-child{border-radius:var(--radius-lg) 0 0 var(--radius-lg)}.btn-group .btn:last-child{border-radius:0 var(--radius-lg) var(--radius-lg) 0;border-right:none}.btn-loading{position:relative;color:transparent!important;pointer-events:none}.btn-loading:after{content:"";position:absolute;width:18px;height:18px;border:2px solid transparent;border-top-color:currentColor;border-radius:50%;animation:btn-spin .6s linear infinite}.btn-loading.btn-primary:after,.btn-loading.btn-danger:after,.btn-loading.btn-success:after{border-top-color:#fff}@keyframes btn-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.btn-pill{border-radius:var(--radius-full)}.btn-glow{animation:pulse-glow 2s ease-in-out infinite}@keyframes pulse-glow{0%,to{box-shadow:var(--shadow-md),0 0 0 0 var(--accent-primary-glow)}50%{box-shadow:var(--shadow-lg),var(--shadow-glow)}}.btn-tab{background:transparent;color:var(--text-secondary);border-radius:var(--radius-md);padding:var(--space-2) var(--space-4);font-weight:var(--font-weight-medium)}.btn-tab:hover:not(:disabled){background:var(--bg-tertiary);color:var(--text-primary)}.btn-tab.active{background:var(--accent-primary-subtle);color:var(--accent-primary)}.btn-chip{padding:var(--space-1) var(--space-3);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium);border-radius:var(--radius-full);background:var(--bg-tertiary);color:var(--text-secondary)}.btn-chip:hover:not(:disabled){background:var(--accent-primary-subtle);color:var(--accent-primary)}.btn-chip.active{background:var(--accent-primary);color:#fff}.btn-link{background:none;color:var(--accent-primary);padding:0;text-decoration:none}.btn-link:hover:not(:disabled){color:var(--accent-primary-hover);text-decoration:underline}.btn-fab{width:56px;height:56px;border-radius:var(--radius-full);background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-xl),var(--shadow-glow);position:fixed;bottom:var(--space-6);right:var(--space-6);z-index:var(--z-sticky)}.btn-fab:hover:not(:disabled){transform:scale(1.05);box-shadow:var(--shadow-2xl),var(--shadow-glow-lg)}.btn-fab svg{width:24px;height:24px}.btn-split{display:inline-flex;border-radius:var(--radius-lg);overflow:hidden}.btn-split .btn-main{border-radius:var(--radius-lg) 0 0 var(--radius-lg);border-right:1px solid rgba(255,255,255,.2)}.btn-split .btn-dropdown{border-radius:0 var(--radius-lg) var(--radius-lg) 0;padding:var(--space-2)}.btn-text{background:transparent;color:var(--accent-primary);padding:var(--space-2)}.btn-text:hover:not(:disabled){background:var(--accent-primary-subtle)}.card{background:var(--bg-glass);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--space-6);transition:all var(--transition-normal);position:relative;overflow:hidden}.card:before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--accent-primary-subtle),transparent);opacity:0;transition:opacity var(--transition-normal)}.card:hover{background:var(--bg-glass-hover);border-color:var(--border-focus);box-shadow:var(--shadow-card);transform:translateY(-2px)}.card:hover:before{opacity:1}.card-solid{background:var(--bg-secondary);backdrop-filter:none;-webkit-backdrop-filter:none;border:1px solid var(--border-primary)}.card-elevated{background:var(--bg-elevated);box-shadow:var(--shadow-lg)}.card-gradient{background:var(--gradient-dark);border:1px solid var(--border-glass)}.card-glow{box-shadow:var(--shadow-glow)}.card-glow:hover{box-shadow:var(--shadow-glow-lg)}.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-4);padding-bottom:var(--space-4);border-bottom:1px solid var(--border-secondary)}.card-header-icon{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:var(--accent-primary-subtle);border-radius:var(--radius-lg);color:var(--accent-primary)}.card-header-icon 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var(--transition-normal);position:relative;overflow:hidden}.stat-card:before{content:"";position:absolute;top:0;left:50%;transform:translate(-50%);width:60%;height:2px;background:var(--gradient-primary);border-radius:var(--radius-full);opacity:0;transition:opacity var(--transition-normal)}.stat-card:hover{transform:translateY(-4px);border-color:var(--border-focus);box-shadow:var(--shadow-colored)}.stat-card:hover:before{opacity:1}.stat-card-icon{width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--accent-primary-subtle);border-radius:var(--radius-lg);color:var(--accent-primary);margin-bottom:var(--space-2)}.stat-card-icon svg{width:24px;height:24px}.stat-card-value{font-family:var(--font-mono);font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);color:var(--text-primary);line-height:1;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.stat-card-label{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:var(--font-weight-medium)}.stat-card-trend{display:flex;align-items:center;gap:var(--space-1);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium)}.stat-card-trend.up{color:var(--accent-success)}.stat-card-trend.down{color:var(--accent-error)}.lesson-card{background:var(--bg-glass);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--space-5);display:flex;flex-direction:column;gap:var(--space-3);transition:all var(--transition-normal);cursor:pointer;position:relative;overflow:hidden}.lesson-card:after{content:"";position:absolute;inset:0;background:var(--gradient-glow);opacity:0;transition:opacity var(--transition-normal);pointer-events:none}.lesson-card:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-colored);transform:translateY(-2px)}.lesson-card:hover:after{opacity:1}.lesson-card.completed{border-color:var(--accent-success)}.lesson-card.completed:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--gradient-success)}.lesson-card.active{border-color:var(--accent-primary);box-shadow:var(--shadow-glow)}.lesson-card-header{display:flex;align-items:center;justify-content:space-between;position:relative;z-index:1}.lesson-card-level{font-family:var(--font-mono);font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);color:var(--accent-primary);background:var(--accent-primary-subtle);padding:var(--space-1) var(--space-3);border-radius:var(--radius-full);text-transform:uppercase;letter-spacing:var(--letter-spacing-wide)}.lesson-card-badge{display:flex;align-items:center;gap:var(--space-1);font-size:var(--font-size-xs);color:var(--accent-success)}.lesson-card-badge svg{width:14px;height:14px}.lesson-card-title{font-size:var(--font-size-base);font-weight:var(--font-weight-semibold);color:var(--text-primary);position:relative;z-index:1}.lesson-card-description{font-size:var(--font-size-sm);color:var(--text-secondary);line-height:var(--line-height-normal);position:relative;z-index:1}.lesson-card-stats{display:flex;gap:var(--space-4);font-size:var(--font-size-xs);color:var(--text-muted);position:relative;z-index:1}.lesson-card-stat{display:flex;align-items:center;gap:var(--space-1)}.lesson-card-stat svg{width:14px;height:14px;color:var(--accent-secondary)}.lesson-card-progress{height:4px;background:var(--bg-tertiary);border-radius:var(--radius-full);overflow:hidden;position:relative;z-index:1}.lesson-card-progress-bar{height:100%;background:var(--gradient-primary);border-radius:var(--radius-full);transition:width var(--transition-slow)}.feature-card{background:var(--bg-glass);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--space-6);display:flex;flex-direction:column;gap:var(--space-4);transition:all var(--transition-normal);position:relative}.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-xl);border-color:var(--border-focus)}.feature-card-icon{width:56px;height:56px;display:flex;align-items:center;justify-content:center;background:var(--gradient-primary);border-radius:var(--radius-lg);color:#fff;box-shadow:var(--shadow-glow)}.feature-card-icon svg{width:28px;height:28px}.feature-card-title{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);color:var(--text-primary)}.feature-card-description{font-size:var(--font-size-sm);color:var(--text-secondary);line-height:var(--line-height-relaxed)}.achievement-card{background:var(--bg-glass);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--space-4);display:flex;align-items:center;gap:var(--space-4);transition:all var(--transition-normal)}.achievement-card:hover{border-color:var(--border-focus);box-shadow:var(--shadow-card)}.achievement-card.locked{opacity:.6}.achievement-card.legendary{border-color:var(--accent-warning);background:linear-gradient(135deg,var(--bg-glass) 0%,rgba(251,191,36,.1) 100%)}.achievement-card.epic{border-color:var(--accent-primary);background:linear-gradient(135deg,var(--bg-glass) 0%,var(--accent-primary-subtle) 100%)}.achievement-card-icon{width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--accent-primary-subtle);border-radius:var(--radius-lg);font-size:var(--font-size-2xl);flex-shrink:0}.achievement-card-content{flex:1;min-width:0}.achievement-card-title{font-size:var(--font-size-base);font-weight:var(--font-weight-semibold);color:var(--text-primary)}.achievement-card-description{font-size:var(--font-size-sm);color:var(--text-secondary);margin-top:var(--space-1)}.achievement-card-xp{font-family:var(--font-mono);font-size:var(--font-size-sm);font-weight:var(--font-weight-bold);color:var(--accent-warning)}.card-grid{display:grid;gap:var(--space-4)}.card-grid-2{grid-template-columns:repeat(2,1fr)}.card-grid-3{grid-template-columns:repeat(3,1fr)}.card-grid-4{grid-template-columns:repeat(4,1fr)}@media (max-width: 1024px){.card-grid-4,.card-grid-3{grid-template-columns:repeat(2,1fr)}}@media (max-width: 640px){.card-grid-2,.card-grid-3,.card-grid-4{grid-template-columns:1fr}}.card-interactive{cursor:pointer}.card-interactive:active{transform:scale(.98)}.card-accent{border-left:3px solid var(--accent-primary)}.card-accent-success{border-left:3px solid var(--accent-success)}.card-accent-warning{border-left:3px solid var(--accent-warning)}.card-accent-error{border-left:3px solid var(--accent-error)}.keyboard-container{width:100%;max-width:var(--keyboard-max-width);background:var(--bg-glass);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-2xl);padding:var(--space-6);box-shadow:var(--shadow-xl);position:relative;overflow:hidden}.keyboard-container:before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--accent-primary-subtle),transparent)}.keyboard{display:flex;flex-direction:column;gap:var(--key-gap)}.keyboard-row{display:flex;gap:var(--key-gap);justify-content:center}.key{display:flex;align-items:center;justify-content:center;min-width:var(--key-size);height:var(--key-size);background:var(--key-gradient);border:1px solid var(--key-border);border-radius:var(--radius-lg);font-family:var(--font-mono);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--text-primary);box-shadow:var(--key-shadow);transition:all var(--transition-fast);-webkit-user-select:none;user-select:none;position:relative;cursor:default}.key:before{content:"";position:absolute;top:0;left:0;right:0;height:50%;background:linear-gradient(180deg,rgba(255,255,255,.08) 0%,transparent 100%);border-radius:var(--radius-lg) var(--radius-lg) 0 0;pointer-events:none}.key:hover{background:var(--key-hover);border-color:var(--border-focus);transform:translateY(-1px)}.key.active,.key.pressed{background:var(--key-active);color:#fff;transform:translateY(2px);box-shadow:none}.key.highlight{background:var(--gradient-primary);color:#fff;border-color:var(--accent-primary);box-shadow:var(--shadow-glow),var(--key-shadow);animation:key-pulse 1.5s ease-in-out infinite}@keyframes key-pulse{0%,to{box-shadow:var(--shadow-glow),var(--key-shadow)}50%{box-shadow:var(--shadow-glow-lg),var(--key-shadow)}}.key.correct{background:linear-gradient(135deg,var(--accent-success) 0%,#16a34a 100%);color:#fff;border-color:var(--accent-success);box-shadow:0 0 15px #4ade804d,var(--key-shadow)}.key.incorrect{background:linear-gradient(135deg,var(--accent-error) 0%,#dc2626 100%);color:#fff;border-color:var(--accent-error);animation:shake .3s ease;box-shadow:0 0 15px #f871714d,var(--key-shadow)}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}75%{transform:translate(4px)}}.key-backspace{min-width:calc(var(--key-size) * 2)}.key-tab{min-width:calc(var(--key-size) * 1.5)}.key-caps{min-width:calc(var(--key-size) * 1.75)}.key-enter,.key-shift-left{min-width:calc(var(--key-size) * 2.25)}.key-shift-right{min-width:calc(var(--key-size) * 2.75)}.key-space{min-width:calc(var(--key-size) * 6)}.key-ctrl,.key-alt,.key-cmd{min-width:calc(var(--key-size) * 1.25)}.key-modifier{font-size:var(--font-size-xs);color:var(--text-secondary)}.key-label{display:flex;flex-direction:column;align-items:center;gap:2px}.key-label-main{font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold)}.key-label-sub{font-size:var(--font-size-xs);color:var(--text-muted)}.key[data-finger=pinky-left]{border-bottom:3px solid var(--finger-pinky-left)}.key[data-finger=ring-left]{border-bottom:3px solid var(--finger-ring-left)}.key[data-finger=middle-left]{border-bottom:3px solid var(--finger-middle-left)}.key[data-finger=index-left]{border-bottom:3px solid var(--finger-index-left)}.key[data-finger=thumb]{border-bottom:3px solid var(--finger-thumb)}.key[data-finger=index-right]{border-bottom:3px solid var(--finger-index-right)}.key[data-finger=middle-right]{border-bottom:3px solid var(--finger-middle-right)}.key[data-finger=ring-right]{border-bottom:3px solid var(--finger-ring-right)}.key[data-finger=pinky-right]{border-bottom:3px solid var(--finger-pinky-right)}.key.finger-highlight[data-finger=pinky-left]{background:#f472b64d}.key.finger-highlight[data-finger=ring-left]{background:#fb923c4d}.key.finger-highlight[data-finger=middle-left]{background:#4ade804d}.key.finger-highlight[data-finger=index-left]{background:#60a5fa4d}.key.finger-highlight[data-finger=thumb]{background:#a78bfa4d}.key.finger-highlight[data-finger=index-right]{background:#f472b64d}.key.finger-highlight[data-finger=middle-right]{background:#2dd4bf4d}.key.finger-highlight[data-finger=ring-right]{background:#fbbf244d}.key.finger-highlight[data-finger=pinky-right]{background:#a3e6354d}.key.home-key{position:relative}.key.home-key:after{content:"";position:absolute;bottom:8px;left:50%;transform:translate(-50%);width:6px;height:2px;background:var(--text-muted);border-radius:var(--radius-full)}.key.error-low{background:#4ade8033}.key.error-medium{background:#fbbf244d}.key.error-high{background:#f8717166}.keyboard-legend{display:flex;justify-content:center;gap:var(--space-6);margin-top:var(--space-4);padding-top:var(--space-4);border-top:1px solid var(--border-secondary)}.keyboard-legend-item{display:flex;align-items:center;gap:var(--space-2);font-size:var(--font-size-xs);color:var(--text-muted)}.keyboard-legend-color{width:12px;height:12px;border-radius:var(--radius-sm)}.keyboard-container.minimal{background:transparent;border:none;box-shadow:none;padding:0}.keyboard-container.minimal .key{background:var(--bg-secondary);box-shadow:none;border:1px solid var(--border-primary)}.keyboard-container.minimal .key:before{display:none}@media (max-width: 900px){.keyboard-container{padding:var(--space-4)}:root{--key-size: 40px}}@media (max-width: 640px){:root{--key-size: 32px;--key-gap: 2px}.key{font-size:var(--font-size-xs);border-radius:var(--radius-md)}.keyboard-legend{flex-wrap:wrap;gap:var(--space-3)}}.modal-backdrop{position:fixed;inset:0;background:var(--bg-overlay);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);display:flex;align-items:center;justify-content:center;z-index:var(--z-modal-backdrop);opacity:0;visibility:hidden;transition:opacity var(--transition-normal),visibility var(--transition-normal);padding:var(--space-4)}.modal-backdrop.open{opacity:1;visibility:visible}.modal{background:var(--bg-glass);backdrop-filter:var(--glass-blur-lg);-webkit-backdrop-filter:var(--glass-blur-lg);border:1px solid var(--glass-border);border-radius:var(--radius-2xl);box-shadow:var(--shadow-2xl),var(--shadow-glow);width:100%;max-width:500px;max-height:90vh;overflow:hidden;display:flex;flex-direction:column;transform:scale(.95) translateY(10px);transition:transform var(--transition-normal);position:relative}.modal-backdrop.open 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var(--accent-error)}.question-header{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-4);flex-wrap:wrap}.question-category{font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);color:var(--accent-primary);background-color:#58a6ff1a;padding:var(--space-1) var(--space-2);border-radius:var(--radius-sm)}.question-points{font-size:var(--font-size-xs);color:var(--text-muted)}.question-difficulty{font-size:var(--font-size-xs);font-weight:var(--font-weight-medium);padding:var(--space-1) var(--space-2);border-radius:var(--radius-sm)}.difficulty-beginner{background-color:#3fb9501a;color:var(--accent-success)}.difficulty-intermediate{background-color:#f0883e1a;color:var(--accent-warning)}.difficulty-advanced{background-color:#f851491a;color:var(--accent-error)}.question-text{margin-bottom:var(--space-6)}.question-text pre{font-family:var(--font-mono);font-size:var(--font-size-lg);line-height:var(--line-height-relaxed);white-space:pre-wrap;word-wrap:break-word}.question-hint{font-size:var(--font-size-sm);color:var(--text-muted);margin-top:var(--space-4);padding:var(--space-3);background-color:var(--bg-tertiary);border-radius:var(--radius-md)}.answer-options{display:flex;flex-direction:column;gap:var(--space-3)}.answer-option{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-4);background-color:var(--bg-tertiary);border:1px solid var(--border-primary);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);text-align:left}.answer-option:hover:not(.disabled){border-color:var(--accent-primary);background-color:#58a6ff1a}.answer-option.disabled{cursor:not-allowed;opacity:.7}.answer-option.correct-answer{border-color:var(--accent-success);background-color:#3fb9501a}.answer-option.wrong-answer{border-color:var(--accent-error);background-color:#f851491a}.option-letter{display:flex;align-items:center;justify-content:center;width:28px;height:28px;background-color:var(--bg-secondary);border-radius:var(--radius-md);font-family:var(--font-mono);font-size:var(--font-size-sm);font-weight:var(--font-weight-bold);flex-shrink:0}.option-text{font-size:var(--font-size-sm)}.result-feedback{margin-top:var(--space-4)}.result-feedback.hidden{display:none}.feedback-content{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-4);border-radius:var(--radius-md);margin-bottom:var(--space-4)}.feedback-content.correct{background-color:#3fb9501a;border:1px solid var(--accent-success)}.feedback-content.incorrect{background-color:#f851491a;border:1px solid var(--accent-error)}.feedback-icon{font-size:1.5rem}.feedback-text{font-size:var(--font-size-sm);font-weight:var(--font-weight-medium)}.next-btn{width:100%;padding:var(--space-3) var(--space-4);background-color:var(--accent-primary);color:var(--text-inverse);border-radius:var(--radius-md);font-weight:var(--font-weight-medium);cursor:pointer;transition:background-color var(--transition-fast)}.next-btn:hover{background-color:var(--accent-primary-hover)}.quiz-results{text-align:center;max-width:600px;margin:0 auto}.results-header{margin-bottom:var(--space-6)}.grade-display{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);margin-bottom:var(--space-2)}.grade-a{color:var(--accent-success)}.grade-b{color:#4ade80}.grade-c{color:var(--accent-warning)}.grade-d{color:#fb923c}.grade-f{color:var(--accent-error)}.results-stats{display:flex;justify-content:center;gap:var(--space-6);margin-bottom:var(--space-8)}.result-stat{display:flex;flex-direction:column;align-items:center;gap:var(--space-2)}.result-stat .stat-value{font-family:var(--font-mono);font-size:var(--font-size-2xl);font-weight:var(--font-weight-bold);color:var(--text-primary)}.result-stat .stat-label{font-size:var(--font-size-sm);color:var(--text-secondary)}.results-details{background-color:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-lg);padding:var(--space-5);margin-bottom:var(--space-6);text-align:left}.results-details h3{font-size:var(--font-size-base);margin-bottom:var(--space-4)}.question-results{display:flex;flex-direction:column;gap:var(--space-2);max-height:300px;overflow-y:auto}.question-result{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-2) var(--space-3);background-color:var(--bg-tertiary);border-radius:var(--radius-sm);font-size:var(--font-size-sm)}.question-result.correct{border-left:3px solid var(--accent-success)}.question-result.incorrect{border-left:3px solid var(--accent-error)}.result-icon{flex-shrink:0}.result-question{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text-secondary)}.result-answer{font-family:var(--font-mono);font-size:var(--font-size-xs);color:var(--text-muted)}.results-actions{display:flex;gap:var(--space-4);justify-content:center}.action-btn{padding:var(--space-3) var(--space-6);border-radius:var(--radius-md);font-weight:var(--font-weight-medium);cursor:pointer;transition:all var(--transition-fast)}.action-btn.primary{background-color:var(--accent-primary);color:var(--text-inverse)}.action-btn.primary:hover{background-color:var(--accent-primary-hover)}.action-btn.secondary{background-color:var(--bg-tertiary);border:1px solid var(--border-primary);color:var(--text-primary)}.action-btn.secondary:hover{background-color:var(--bg-elevated)}.quiz-error{text-align:center;padding:var(--space-8);color:var(--text-secondary)}.quiz-error p{margin-bottom:var(--space-4)}@media (max-width: 768px){.quiz-stats-overview{grid-template-columns:repeat(2,1fr)}.quiz-mode-grid{grid-template-columns:1fr}.history-item{flex-direction:column;align-items:flex-start;gap:var(--space-2)}.results-stats{flex-direction:column;gap:var(--space-4)}.results-actions{flex-direction:column}.action-btn{width:100%}}@media (max-width: 768px){:root{--key-size: 40px;--space-8: 1.5rem}.keyboard-container{padding:var(--space-4)}}@media (max-width: 480px){:root{--key-size: 32px;--key-gap: 2px}.key{font-size:var(--font-size-xs)}}