:root{--primary-color: #6366f1;--secondary-color: #10b981;--success-color: #8b5cf6;--warning-color: #f59e0b;--error-color: #ef4444;--background-color: #ffffff;--text-primary: #1f2937;--text-secondary: #6b7280;--border-color: #e5e7eb;--hover-color: #f9fafb;--spacing-xs: .5rem;--spacing-sm: .75rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--font-xs: .75rem;--font-sm: .875rem;--font-md: 1rem;--font-lg: 1.125rem;--font-xl: 1.25rem;--font-2xl: 1.5rem;--font-3xl: 1.875rem;--font-4xl: 2.25rem;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--radius-sm: .25rem;--radius-md: .375rem;--radius-lg: .5rem;--radius-xl: .75rem;--radius-2xl: 1rem}*{box-sizing:border-box}body{margin:0;padding:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe 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cubic-bezier(.4,0,.2,1)!important}.home-hero-btn.primary{background:linear-gradient(135deg,#6366f1,#8b5cf6)!important;box-shadow:0 8px 24px #6366f14d!important}.home-hero-btn.primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px #6366f166!important}.home-hero-btn.secondary{border:2px solid #6366f1!important;color:#6366f1!important}.home-hero-btn.secondary:hover{background:#6366f10d!important;transform:translateY(-2px)}.home-content{padding:4rem 2rem;background:#fff}.home-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem;margin-bottom:5rem}.home-stat-card{background:#fff!important;border-radius:24px!important;border:1px solid rgba(0,0,0,.08)!important;box-shadow:0 8px 32px #00000014!important;transition:all .3s cubic-bezier(.4,0,.2,1)!important}.home-stat-card:hover{transform:translateY(-4px);box-shadow:0 12px 48px #0000001f!important}.home-stat-card .MuiCardContent-root{text-align:center;padding:2rem!important}.home-stat-icon{margin-bottom:1rem}.home-stat-value{font-size:2.5rem!important;font-weight:700!important;color:#1f2937!important;margin-bottom:.5rem!important}.home-stat-label{font-size:.875rem!important;color:#4b5563b3!important;font-weight:500!important;text-transform:uppercase;letter-spacing:.05em}.home-section-title{font-size:2.5rem!important;font-weight:700!important;color:#1f2937!important;text-align:center;margin-bottom:3rem!important}.home-features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin-bottom:5rem}.home-feature-card{height:100%;background:#fff!important;border-radius:24px!important;border:1px solid rgba(0,0,0,.08)!important;box-shadow:0 8px 32px #00000014!important;transition:all .3s cubic-bezier(.4,0,.2,1)!important;overflow:hidden;position:relative}.home-feature-card:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 85% 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40%,rgba(255,255,255,.1) 0%,transparent 60%);pointer-events:none}.home-cta-title{font-size:2rem!important;font-weight:700!important;color:#fff!important;margin-bottom:1rem!important;position:relative;z-index:1}.home-cta-description{font-size:1.125rem!important;color:#ffffffe6!important;line-height:1.6!important;margin-bottom:2rem!important;max-width:600px;margin-left:auto!important;margin-right:auto!important;position:relative;z-index:1;text-align:center}.home-cta-btn{background:#fff!important;color:#6366f1!important;padding:1rem 2.5rem!important;border-radius:16px!important;font-size:1rem!important;font-weight:600!important;text-transform:none!important;box-shadow:0 8px 24px #00000026!important;transition:all .3s cubic-bezier(.4,0,.2,1)!important;position:relative;z-index:1}.home-cta-btn:hover{transform:translateY(-2px);box-shadow:0 12px 32px #0003!important}@media (max-width: 768px){.home-hero{padding:4rem 1.5rem}.home-hero-title{font-size:2.5rem!important}.home-hero-subtitle{font-size:1.25rem!important}.home-hero-description{font-size:1rem!important}.home-hero-buttons{flex-direction:column;align-items:stretch}.home-hero-btn{width:100%}.home-section-title{font-size:2rem!important}.home-stats-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.home-cta{padding:3rem 2rem}.home-cta-title{font-size:1.5rem!important}}.vocabulary-tabs .MuiTab-root{font-weight:600;text-transform:none;font-size:1.1rem;padding:20px 32px;min-height:auto;color:#000000b3;transition:all .3s ease;border:none;outline:none}.vocabulary-tabs .MuiTab-root:focus{outline:none;border:none}.vocabulary-tabs .MuiTab-root:hover{color:#6366f1;background-color:#6366f10d}.vocabulary-tabs .Mui-selected{color:#6366f1!important;background-color:transparent}.vocabulary-tabs .MuiTabs-indicator{background-color:#6366f1;height:4px;border-radius:2px 2px 0 0}.vocabulary-search-field 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#6366f1;background:linear-gradient(135deg,#f8f9ff,#eef2ff,#e6edff)}.vocabulary-card-content{padding:24px;flex-grow:1;display:flex;flex-direction:column}.vocabulary-card-chips{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}.vocabulary-level-chip{font-weight:500;min-width:60px}.vocabulary-category-chip{color:var(--text-secondary)}.vocabulary-word-section{margin-bottom:16px}.vocabulary-word-header{display:flex;align-items:center;gap:8px;margin-bottom:8px}.vocabulary-word-title{font-weight:700!important;color:var(--primary-color)!important}.vocabulary-pronounce-btn{color:var(--primary-color)!important}.vocabulary-word-card .difficulty-indicator{position:absolute;top:var(--spacing-md);right:var(--spacing-md);width:12px;height:12px;border-radius:50%}.difficulty-beginner{background-color:#10b981}.difficulty-intermediate{background-color:#f59e0b}.difficulty-advanced{background-color:#ef4444}.difficulty-expert{background-color:#8b5cf6}.vocabulary-pronunciation{font-style:italic!important;color:var(--text-secondary)!important}.vocabulary-english-definition{margin-bottom:8px!important}.vocabulary-examples{margin-top:16px}.vocabulary-examples-title{font-weight:700!important;margin-bottom:8px!important}.vocabulary-example-item{margin-bottom:8px}.vocabulary-example-bulgarian{font-style:italic!important}.vocabulary-example-english{color:var(--text-secondary)!important}.vocabulary-last-reviewed{margin-top:16px!important;display:block!important;color:var(--text-secondary)!important}.vocabulary-mastered-icon{position:absolute;top:8px;right:8px;color:#6366f1}.vocabulary-card-actions{padding:0 16px 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(max-width: 768px){.daily-practice-hero{padding:32px 20px}.daily-practice-hero-title{font-size:2.5rem!important}.daily-stats-grid{grid-template-columns:repeat(2,1fr);gap:1rem}.daily-section-header{flex-direction:column;align-items:flex-start;gap:1rem}.daily-section-filter{width:100%;flex-wrap:wrap}.daily-exercises-grid{grid-template-columns:1fr;gap:1.5rem}.daily-quick-practice-btn{padding:1rem 2rem!important;font-size:1rem!important}.daily-motivation-section{padding:2rem 1.5rem}.daily-dialog-content{padding:1.5rem}}@media (max-width: 480px){.daily-practice-hero{padding:24px 16px}.daily-practice-hero-title{font-size:2rem!important}.daily-stats-grid{grid-template-columns:1fr}.daily-exercise-content{padding:1.5rem}.daily-exercise-actions{padding:0 1.5rem 1.5rem}.daily-quick-grid{grid-template-columns:1fr}.daily-filter-chip{font-size:.75rem;padding:.375rem 1rem}.daily-motivation-section{padding:1.5rem 1rem}.daily-motivation-title{font-size:1.5rem!important}}.grammar-hero-section{position:relative;background:linear-gradient(135deg,#6366f11f,#4f46e526,#8b5cf61f,#a855f714,#fffffff2);border-radius:24px;padding:48px 32px;overflow:hidden;margin-bottom:2rem}.grammar-hero-section:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 15% 15%,rgba(99,102,241,.15) 0%,transparent 40%),radial-gradient(circle at 85% 25%,rgba(139,92,246,.12) 0%,transparent 45%),radial-gradient(circle at 70% 85%,rgba(168,85,247,.1) 0%,transparent 35%);pointer-events:none}.grammar-hero-content{position:relative;z-index:1;text-align:center;max-width:800px;margin:0 auto}.grammar-hero-badge{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#6366f1,#4f46e5);color:#fff;padding:8px 20px;border-radius:24px;font-size:.875rem;font-weight:600;margin-bottom:24px;box-shadow:0 4px 20px #6366f14d}.grammar-hero-title{font-weight:800!important;background:linear-gradient(135deg,#1f2937,#4b5563,#6366f1);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:16px!important;font-size:3.5rem!important;line-height:1.3!important;letter-spacing:-.02em!important;position:relative;z-index:10;padding-bottom:8px}.grammar-hero-subtitle{color:#4b5563cc!important;font-weight:400!important;line-height:1.6!important;margin-bottom:32px!important}.grammar-premium-progress{background:linear-gradient(135deg,#ffffffe6,#f8fafce6);border:1px solid rgba(99,102,241,.15);border-radius:20px;padding:32px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #00000014;max-width:900px;margin:0 auto 2rem;overflow:hidden}.grammar-progress-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:24px}.grammar-progress-label{display:flex;align-items:flex-start;gap:20px}.grammar-progress-icon-premium{width:56px;height:56px;background:linear-gradient(135deg,#6366f1,#4f46e5);border-radius:16px;display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:0 8px 24px #6366f14d}.grammar-progress-title-premium{font-weight:700!important;color:#1f2937!important;margin-bottom:4px!important}.grammar-progress-subtitle-premium{color:#4b5563b3!important;font-weight:400!important}.grammar-progress-stats{text-align:right}.grammar-progress-number{font-weight:800!important;background:linear-gradient(135deg,#6366f1,#4f46e5);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1!important;margin-bottom:4px!important}.grammar-progress-text{color:#4b556399!important;font-weight:500!important;text-transform:uppercase;letter-spacing:.5px}.grammar-progress-details{display:flex;align-items:center;gap:24px;margin-top:0}.grammar-progress-metric{display:flex;flex-direction:column;align-items:center;gap:4px;min-width:80px}.grammar-progress-metric .metric-number{font-size:1.5rem;font-weight:700;color:#1f2937}.grammar-progress-metric .metric-label{font-size:.75rem;color:#4b556399;text-transform:uppercase;letter-spacing:.5px;font-weight:500}.grammar-progress-bar-container{flex:1;padding:0 16px;max-width:100%}.grammar-progress-bar-premium{height:8px;border-radius:12px;background:linear-gradient(90deg,#6366f11a 0% 100%);overflow:hidden;margin-top:8px}.grammar-progress-bar-fill{height:100%;background:linear-gradient(90deg,#6366f1,#4f46e5);border-radius:12px;transition:width .3s ease}.grammar-progress-paper{padding:1.5rem;margin-bottom:2rem;box-shadow:0 2px 8px #0000001a}.grammar-progress-container{display:flex;align-items:center;gap:1.5rem}.grammar-progress-text{flex:1}.grammar-progress-title{font-weight:600;margin-bottom:.5rem}.grammar-progress-subtitle{color:#6b7280;margin-bottom:1rem}.grammar-stats-box{display:flex;gap:2rem;justify-content:center}.grammar-stat-box{text-align:center}.grammar-stat-number{font-size:2rem;font-weight:700;line-height:1}.grammar-stat-number.mastered{color:#10b981}.grammar-stat-number.progress{color:#f59e0b}.grammar-stat-label{font-size:.875rem;color:#6b7280;margin-top:.25rem}.grammar-category-tabs{border-bottom:1px solid #e5e7eb;margin-bottom:2rem}.grammar-rules-title{font-size:1.25rem;font-weight:600;margin-bottom:1.5rem;color:#1f2937}.grammar-rules-container{display:flex;flex-direction:column;gap:1.5rem}.grammar-stats-container{display:flex;justify-content:center;gap:var(--spacing-xl);margin-top:var(--spacing-lg)}.grammar-stat-item{text-align:center}.grammar-stat-number{font-size:var(--font-4xl);font-weight:700;margin-bottom:var(--spacing-xs)}.grammar-stat-label{font-size:var(--font-sm);opacity:.9}.grammar-tabs{border-bottom:2px solid var(--border-color);margin-bottom:var(--spacing-xl)}.grammar-rule-card{position:relative!important;margin-bottom:1.5rem!important;border-radius:20px!important;box-shadow:0 8px 32px #00000014!important;background:linear-gradient(145deg,#fffffff2,#f8fafcf2)!important;border:1px solid rgba(0,0,0,.08)!important;transition:all .3s cubic-bezier(.4,0,.2,1)!important;overflow:hidden!important;-webkit-backdrop-filter:blur(10px)!important;backdrop-filter:blur(10px)!important}.grammar-rule-card:before{content:""!important;position:absolute!important;inset:0!important;background:radial-gradient(circle at 85% 15%,rgba(99,102,241,.05) 0%,transparent 40%),radial-gradient(circle at 15% 85%,rgba(139,92,246,.03) 0%,transparent 35%)!important;pointer-events:none!important}.grammar-rule-card:hover{transform:translateY(-8px)!important;box-shadow:0 12px 48px #6366f126!important;border-color:#6366f133!important}.grammar-rule-card.mastered{background:linear-gradient(145deg,#10b9810d,#fffffff2);border:2px solid rgba(16,185,129,.2)}.grammar-rule-card.mastered:before{background:radial-gradient(circle at 85% 15%,rgba(16,185,129,.08) 0%,transparent 40%),radial-gradient(circle at 15% 85%,rgba(52,211,153,.05) 0%,transparent 35%)}.grammar-rule-content{padding:2rem;position:relative;z-index:1}.grammar-rule-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:1rem;gap:1rem}.grammar-rule-main{flex:1}.grammar-rule-chips{display:flex;gap:.5rem;margin-bottom:1rem;flex-wrap:wrap;align-items:center}.grammar-level-chip{font-size:.75rem;font-weight:600;padding:.5rem 1rem;border-radius:16px;color:#fff;display:inline-flex;align-items:center;box-shadow:0 2px 8px #0000001a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2)}.grammar-level-chip.intermediate{background:linear-gradient(135deg,#ff9800,#f57c00)}.grammar-level-chip.advanced{background:linear-gradient(135deg,#2196f3,#1976d2)}.grammar-level-chip.expert{background:linear-gradient(135deg,#9c27b0,#7b1fa2)}.grammar-category-chip{font-size:.75rem;font-weight:500;padding:.5rem 1rem;border-radius:16px;border:1px solid rgba(99,102,241,.2);background:#fffc;color:#6366f1;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.grammar-mastered-chip{font-size:.75rem;font-weight:600;padding:.5rem 1rem;border-radius:16px;background:linear-gradient(135deg,#10b981,#059669);color:#fff;display:inline-flex;align-items:center;gap:.25rem;box-shadow:0 2px 8px #10b9814d;border:1px solid rgba(255,255,255,.2)}.grammar-rule-title{font-size:1.25rem;font-weight:700;margin-bottom:.75rem;color:#1f2937}.grammar-rule-description{color:#6b7280;line-height:1.6;margin-bottom:0}.grammar-exercise-info{text-align:center;min-width:120px;padding:1rem;background:linear-gradient(135deg,#6366f10d,#fffc);border-radius:16px;border:1px solid rgba(99,102,241,.1);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.grammar-exercise-number{font-size:1.75rem;font-weight:800;background:linear-gradient(135deg,#6366f1,#4f46e5);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1;margin-bottom:.25rem}.grammar-exercise-label{font-size:.75rem;color:#4b5563b3;font-weight:500;text-transform:uppercase;letter-spacing:.5px}.grammar-rule-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:var(--spacing-lg)}.grammar-rule-meta{display:flex;gap:var(--spacing-sm);flex-wrap:wrap;align-items:center;margin-bottom:var(--spacing-lg)}.grammar-exercise-count{text-align:center;min-width:100px;margin-left:var(--spacing-md)}.grammar-exercise-number{font-size:var(--font-xl);font-weight:700;color:var(--primary-color)}.grammar-exercise-label{font-size:var(--font-sm);color:var(--text-secondary)}.grammar-accordion{margin-bottom:1rem;box-shadow:none!important;border:1px solid rgba(99,102,241,.1);border-radius:16px!important;background:linear-gradient(145deg,#ffffffe6,#f8fafce6);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);overflow:hidden}.grammar-accordion-summary{background:linear-gradient(135deg,#6366f114,#8b5cf60d);border-radius:16px 16px 0 0;font-weight:600;padding:1rem 1.5rem;border-bottom:1px solid rgba(99,102,241,.1)}.grammar-accordion-details{padding:2rem;background:linear-gradient(145deg,#fffffff2,#f8fafcf2)}.grammar-examples-section{margin:1.5rem 0}.grammar-examples-title{display:flex;align-items:center;gap:.5rem;font-size:1.125rem;font-weight:600;margin-bottom:1rem;color:#1f2937}.grammar-example-card{background:linear-gradient(145deg,#fffc,#f8fafccc);border-radius:16px;padding:1.5rem;margin-bottom:1rem;border:1px solid rgba(99,102,241,.1);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 4px 16px #0000000d}.grammar-example-correct{font-weight:600;color:var(--success-color);margin-bottom:var(--spacing-xs)}.grammar-example-incorrect{color:var(--error-color);margin-bottom:var(--spacing-xs)}.grammar-example-explanation{color:var(--text-secondary);margin-bottom:var(--spacing-xs)}.grammar-example-translation{font-style:italic;color:var(--text-secondary)}.grammar-section-divider{margin:1.5rem 0;border-color:#e5e7eb}.grammar-tips-section{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin:1.5rem 0}.grammar-section-title{display:flex;align-items:center;gap:.5rem;font-size:1.125rem;font-weight:600;margin-bottom:1rem;color:#1f2937}.grammar-mistakes-list{list-style:none;padding:0;margin:0}.grammar-mistakes-list li{padding:.5rem 0;color:#ef4444;font-size:.875rem;line-height:1.4}.grammar-tips-list{list-style:none;padding:0;margin:0}.grammar-tips-list li{padding:.5rem 0;color:#10b981;font-size:.875rem;line-height:1.4}.grammar-action-buttons{display:flex;gap:1rem;margin-top:1.5rem}.grammar-practice-btn{flex:1;background:linear-gradient(135deg,#6366f1,#8b5cf6)!important;color:#fff!important;font-weight:600!important;padding:1rem 2rem!important;border-radius:16px!important;text-transform:none!important;box-shadow:0 8px 25px #6366f14d!important;transition:all .3s cubic-bezier(.4,0,.2,1)!important;border:1px solid rgba(255,255,255,.2)!important;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.grammar-practice-btn:hover{background:linear-gradient(135deg,#4f46e5,#7c3aed)!important;box-shadow:0 12px 35px #6366f166!important;transform:translateY(-4px)}.grammar-study-btn{flex:1;color:#6366f1!important;border:2px solid rgba(99,102,241,.2)!important;background:#fffc!important;font-weight:600!important;padding:1rem 2rem!important;border-radius:16px!important;text-transform:none!important;transition:all .3s cubic-bezier(.4,0,.2,1)!important;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.grammar-study-btn:hover{background:linear-gradient(135deg,#6366f11a,#ffffffe6)!important;border-color:#6366f1!important;transform:translateY(-2px);box-shadow:0 8px 25px #6366f126!important}.grammar-empty-state{text-align:center;padding:4rem 2rem}.grammar-empty-text{font-size:1.125rem;color:#6b7280}@media (max-width: 768px){.grammar-hero-section{padding:32px 20px}.grammar-hero-title{font-size:2.5rem!important}.grammar-premium-progress{padding:24px 20px}.grammar-progress-header{flex-direction:column;gap:20px;text-align:center}.grammar-progress-stats{text-align:center}.grammar-progress-details{flex-direction:column;gap:16px;text-align:center}.grammar-progress-bar-container{padding:0;width:100%}.grammar-rule-header{flex-direction:column;gap:1rem}.grammar-exercise-info{margin:0;order:-1}.grammar-tips-section{grid-template-columns:1fr;gap:1.5rem}.grammar-action-buttons{flex-direction:column}.grammar-rule-chips{justify-content:center}.grammar-accordion-details{padding:1rem}}@media (max-width: 480px){.grammar-hero-section{padding:24px 16px}.grammar-hero-title{font-size:2rem!important}.grammar-premium-progress{padding:20px 16px}.grammar-rule-content{padding:1rem}.grammar-example-card,.grammar-accordion-details{padding:.75rem}}.app-container{min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2)}.cyrillic-font{font-family:Roboto,Arial,sans-serif;font-weight:500}.bulgarian-text{font-size:1.2em;color:#1976d2;font-weight:600}.pronunciation-guide{font-family:Courier New,monospace;color:#666;font-style:italic}.language-card{transition:all .3s cubic-bezier(.4,0,.2,1)}.language-card:hover{transform:translateY(-8px);box-shadow:0 12px 24px #00000026}.gradient-primary{background:linear-gradient(135deg,#667eea,#764ba2)}.gradient-success{background:linear-gradient(135deg,#4ecdc4,#44a08d)}.gradient-warning{background:linear-gradient(135deg,#ffecd2,#fcb69f)}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.pulse{animation:pulse 2s infinite}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f1f1f1;border-radius:4px}::-webkit-scrollbar-thumb{background:#888;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#555}