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var(--radius-lg) var(--radius-lg) 0;border-right:none}.btn-loading{pointer-events:none;position:relative;color:#0000!important}.btn-loading:after{content:"";border:2px solid #0000;border-top-color:currentColor;border-radius:50%;width:18px;height:18px;animation:.6s linear infinite btn-spin;position:absolute}.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:2s ease-in-out infinite pulse-glow}@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{color:var(--text-secondary);border-radius:var(--radius-md);padding:var(--space-2) var(--space-4);font-weight:var(--font-weight-medium);background:0 0}.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{color:var(--accent-primary);background:0 0;padding:0;text-decoration:none}.btn-link:hover:not(:disabled){color:var(--accent-primary-hover);text-decoration:underline}.btn-fab{border-radius:var(--radius-full);background:var(--gradient-primary);color:#fff;width:56px;height:56px;box-shadow:var(--shadow-xl), var(--shadow-glow);bottom:var(--space-6);right:var(--space-6);z-index:var(--z-sticky);position:fixed}.btn-fab:hover:not(:disabled){box-shadow:var(--shadow-2xl), var(--shadow-glow-lg);transform:scale(1.05)}.btn-fab svg{width:24px;height:24px}.btn-split{border-radius:var(--radius-lg);display:inline-flex;overflow:hidden}.btn-split .btn-main{border-radius:var(--radius-lg) 0 0 var(--radius-lg);border-right:1px solid #fff3}.btn-split .btn-dropdown{border-radius:0 var(--radius-lg) var(--radius-lg) 0;padding:var(--space-2)}.btn-text{color:var(--accent-primary);padding:var(--space-2);background:0 0}.btn-text:hover:not(:disabled){background:var(--accent-primary-subtle)}.card{background:var(--bg-glass);-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:"";background:linear-gradient(90deg, transparent, 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var(--border-secondary);justify-content:space-between;align-items:center;display:flex}.card-header-icon{background:var(--accent-primary-subtle);border-radius:var(--radius-lg);width:40px;height:40px;color:var(--accent-primary);justify-content:center;align-items:center;display:flex}.card-header-icon svg{width:20px;height:20px}.card-title{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);color:var(--text-primary);letter-spacing:var(--letter-spacing-tight)}.card-subtitle{font-size:var(--font-size-sm);color:var(--text-secondary);margin-top:var(--space-1)}.card-description{font-size:var(--font-size-sm);color:var(--text-secondary);line-height:var(--line-height-relaxed)}.card-body{flex:1}.card-footer{margin-top:var(--space-4);padding-top:var(--space-4);border-top:1px solid var(--border-secondary);justify-content:space-between;align-items:center;display:flex}.stat-card{background:var(--bg-glass);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--space-5);align-items:center;gap:var(--space-2);text-align:center;transition:all var(--transition-normal);flex-direction:column;display:flex;position:relative;overflow:hidden}.stat-card:before{content:"";background:var(--gradient-primary);border-radius:var(--radius-full);opacity:0;width:60%;height:2px;transition:opacity var(--transition-normal);position:absolute;top:0;left:50%;transform:translate(-50%)}.stat-card:hover{border-color:var(--border-focus);box-shadow:var(--shadow-colored);transform:translateY(-4px)}.stat-card:hover:before{opacity:1}.stat-card-icon{background:var(--accent-primary-subtle);border-radius:var(--radius-lg);width:48px;height:48px;color:var(--accent-primary);margin-bottom:var(--space-2);justify-content:center;align-items:center;display:flex}.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);background:var(--gradient-primary);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;line-height:1}.stat-card-label{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:var(--font-weight-medium)}.stat-card-trend{align-items:center;gap:var(--space-1);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium);display:flex}.stat-card-trend.up{color:var(--accent-success)}.stat-card-trend.down{color:var(--accent-error)}.lesson-card{background:var(--bg-glass);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--space-5);gap:var(--space-3);transition:all var(--transition-normal);cursor:pointer;flex-direction:column;display:flex;position:relative;overflow:hidden}.lesson-card:after{content:"";background:var(--gradient-glow);opacity:0;transition:opacity var(--transition-normal);pointer-events:none;position:absolute;inset:0}.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:"";background:var(--gradient-success);height:3px;position:absolute;top:0;left:0;right:0}.lesson-card.active{border-color:var(--accent-primary);box-shadow:var(--shadow-glow)}.lesson-card-header{z-index:1;justify-content:space-between;align-items:center;display:flex;position:relative}.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{align-items:center;gap:var(--space-1);font-size:var(--font-size-xs);color:var(--accent-success);display:flex}.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);z-index:1;position:relative}.lesson-card-description{font-size:var(--font-size-sm);color:var(--text-secondary);line-height:var(--line-height-normal);z-index:1;position:relative}.lesson-card-stats{gap:var(--space-4);font-size:var(--font-size-xs);color:var(--text-muted);z-index:1;display:flex;position:relative}.lesson-card-stat{align-items:center;gap:var(--space-1);display:flex}.lesson-card-stat svg{width:14px;height:14px;color:var(--accent-secondary)}.lesson-card-progress{background:var(--bg-tertiary);border-radius:var(--radius-full);z-index:1;height:4px;position:relative;overflow:hidden}.lesson-card-progress-bar{background:var(--gradient-primary);border-radius:var(--radius-full);height:100%;transition:width var(--transition-slow)}.feature-card{background:var(--bg-glass);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--space-6);gap:var(--space-4);transition:all var(--transition-normal);flex-direction:column;display:flex;position:relative}.feature-card:hover{box-shadow:var(--shadow-xl);border-color:var(--border-focus);transform:translateY(-4px)}.feature-card-icon{background:var(--gradient-primary);border-radius:var(--radius-lg);color:#fff;width:56px;height:56px;box-shadow:var(--shadow-glow);justify-content:center;align-items:center;display:flex}.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);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--space-4);align-items:center;gap:var(--space-4);transition:all var(--transition-normal);display:flex}.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%, #fbbf241a 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{background:var(--accent-primary-subtle);border-radius:var(--radius-lg);width:48px;height:48px;font-size:var(--font-size-2xl);flex-shrink:0;justify-content:center;align-items:center;display:flex}.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{gap:var(--space-4);display:grid}.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);-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:"";background:linear-gradient(90deg, transparent, var(--accent-primary-subtle), transparent);height:1px;position:absolute;top:0;left:0;right:0}.keyboard{gap:var(--key-gap);flex-direction:column;display:flex}.keyboard-row{gap:var(--key-gap);justify-content:center;display:flex}.key{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;cursor:default;justify-content:center;align-items:center;display:flex;position:relative}.key:before{content:"";border-radius:var(--radius-lg) var(--radius-lg) 0 0;pointer-events:none;background:linear-gradient(#ffffff14 0%,#0000 100%);height:50%;position:absolute;top:0;left:0;right:0}.key:hover{background:var(--key-hover);border-color:var(--border-focus);transform:translateY(-1px)}.key.active,.key.pressed{background:var(--key-active);color:#fff;box-shadow:none;transform:translateY(2px)}.key.highlight{background:var(--gradient-primary);color:#fff;border-color:var(--accent-primary);box-shadow:var(--shadow-glow), var(--key-shadow);animation:1.5s ease-in-out infinite key-pulse}@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);box-shadow:0 0 15px #f871714d, var(--key-shadow);animation:.3s shake}@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{flex-direction:column;align-items:center;gap:2px;display:flex}.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:"";background:var(--text-muted);border-radius:var(--radius-full);width:6px;height:2px;position:absolute;bottom:8px;left:50%;transform:translate(-50%)}.key.error-low{background:#4ade8033}.key.error-medium{background:#fbbf244d}.key.error-high{background:#f8717166}.keyboard-legend{justify-content:center;gap:var(--space-6);margin-top:var(--space-4);padding-top:var(--space-4);border-top:1px solid var(--border-secondary);display:flex}.keyboard-legend-item{align-items:center;gap:var(--space-2);font-size:var(--font-size-xs);color:var(--text-muted);display:flex}.keyboard-legend-color{border-radius:var(--radius-sm);width:12px;height:12px}.keyboard-container.minimal{box-shadow:none;background:0 0;border: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{gap:var(--space-3);flex-wrap:wrap}}.modal-backdrop{background:var(--bg-overlay);-webkit-backdrop-filter:var(--glass-blur);z-index:var(--z-modal-backdrop);opacity:0;visibility:hidden;transition:opacity var(--transition-normal), visibility 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var(--border-secondary);justify-content:space-between;align-items:center;display:flex}.modal-title{font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold);color:var(--text-primary);letter-spacing:var(--letter-spacing-tight)}.modal-subtitle{font-size:var(--font-size-sm);color:var(--text-secondary);margin-top:var(--space-1)}.modal-close{border-radius:var(--radius-lg);width:36px;height:36px;color:var(--text-secondary);cursor:pointer;transition:all var(--transition-normal);background:0 0;border:none;justify-content:center;align-items:center;display:flex}.modal-close:hover{background:var(--accent-primary-subtle);color:var(--accent-primary)}.modal-close svg{width:20px;height:20px}.modal-body{padding:var(--space-6);flex:1;overflow-y:auto}.modal-footer{justify-content:flex-end;align-items:center;gap:var(--space-3);padding:var(--space-4) var(--space-6);border-top:1px solid var(--border-secondary);display:flex}.settings-modal{max-width:600px}.settings-content{padding:var(--space-4) 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var(--space-2);border-radius:var(--radius-sm)}.difficulty-beginner{color:var(--accent-success);background-color:#3fb9501a}.difficulty-intermediate{color:var(--accent-warning);background-color:#f0883e1a}.difficulty-advanced{color:var(--accent-error);background-color:#f851491a}.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{gap:var(--space-3);flex-direction:column;display:flex}.answer-option{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;display:flex}.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{background-color:var(--bg-secondary);border-radius:var(--radius-md);width:28px;height:28px;font-family:var(--font-mono);font-size:var(--font-size-sm);font-weight:var(--font-weight-bold);flex-shrink:0;justify-content:center;align-items:center;display:flex}.option-text{font-size:var(--font-size-sm)}.result-feedback{margin-top:var(--space-4)}.result-feedback.hidden{display:none}.feedback-content{align-items:center;gap:var(--space-3);padding:var(--space-4);border-radius:var(--radius-md);margin-bottom:var(--space-4);display:flex}.feedback-content.correct{border:1px solid var(--accent-success);background-color:#3fb9501a}.feedback-content.incorrect{border:1px solid var(--accent-error);background-color:#f851491a}.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,.grade-b{color:var(--accent-success)}.grade-c,.grade-d{color:var(--accent-warning)}.grade-f{color:var(--accent-error)}.results-stats{justify-content:center;gap:var(--space-6);margin-bottom:var(--space-8);display:flex}.result-stat{align-items:center;gap:var(--space-2);flex-direction:column;display:flex}.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{gap:var(--space-2);flex-direction:column;max-height:300px;display:flex;overflow-y:auto}.question-result{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);display:flex}.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{text-overflow:ellipsis;white-space:nowrap;color:var(--text-secondary);flex:1;overflow:hidden}.result-answer{font-family:var(--font-mono);font-size:var(--font-size-xs);color:var(--text-muted)}.results-actions{gap:var(--space-4);justify-content:center;display:flex}.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{align-items:flex-start;gap:var(--space-2);flex-direction:column}.results-stats{gap:var(--space-4);flex-direction:column}.results-actions{flex-direction:column}.action-btn{width:100%}: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)}}