@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--color-primary: #6366f1;--color-primary-light: #818cf8;--color-primary-dark: #4f46e5;--color-secondary: #ec4899;--color-secondary-light: #f472b6;--color-success: #10b981;--color-warning: #f59e0b;--color-error: #ef4444;--color-bg: #f8fafc;--color-bg-card: #ffffff;--color-bg-hover: #f1f5f9;--color-text: #1e293b;--color-text-secondary: #64748b;--color-text-muted: #94a3b8;--color-border: #e2e8f0;--gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);--gradient-success: linear-gradient(135deg, #10b981 0%, #34d399 100%);--gradient-warm: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px rgba(0, 0, 0, .1);--shadow-glow: 0 0 20px rgba(99, 102, 241, .3);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-xs: 12px;--font-size-sm: 14px;--font-size-base: 16px;--font-size-lg: 18px;--font-size-xl: 20px;--font-size-2xl: 24px;--font-size-3xl: 30px;--font-size-4xl: 36px;--transition-fast: .15s ease;--transition-base: .2s ease;--transition-slow: .3s ease}[data-theme=dark]{--color-bg: #0f172a;--color-bg-card: #1e293b;--color-bg-hover: #334155;--color-text: #f1f5f9;--color-text-secondary: #94a3b8;--color-text-muted: #64748b;--color-border: #334155;--shadow-glow: 0 0 20px rgba(99, 102, 241, 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var(--transition-base)}.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.card-glass{background:#ffffff1a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-lg);border:none;border-radius:var(--radius-md);font-size:var(--font-size-base);font-weight:500;cursor:pointer;transition:all var(--transition-fast);text-decoration:none}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-md)}.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-glow)}.btn-secondary{background:var(--color-bg-hover);color:var(--color-text)}.btn-secondary:hover{background:var(--color-border)}.btn-outline{background:transparent;border:2px solid var(--color-primary);color:var(--color-primary)}.btn-outline:hover{background:var(--color-primary);color:#fff}.btn-lg{padding:var(--spacing-md) var(--spacing-xl);font-size:var(--font-size-lg)}.btn-sm{padding:var(--spacing-xs) var(--spacing-md);font-size:var(--font-size-sm)}.progress-ring__circle{transform:rotate(-90deg)}.badge{display:inline-flex;align-items:center;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-full);font-size:var(--font-size-xs);font-weight:500}.badge-primary{background:#6366f11a;color:var(--color-primary)}.badge-success{background:#10b9811a;color:var(--color-success)}.badge-warning{background:#f59e0b1a;color:var(--color-warning)}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes 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var(--transition-fast)}.bottom-nav-icon{font-size:22px}.input{width:100%;padding:var(--spacing-md);border:2px solid var(--color-border);border-radius:var(--radius-md);font-size:var(--font-size-base);background:var(--color-bg-card);color:var(--color-text);transition:border-color var(--transition-fast)}.input:focus{outline:none;border-color:var(--color-primary)}.input::placeholder{color:var(--color-text-muted)}.stat-card{text-align:center;padding:var(--spacing-lg)}.stat-value{font-size:var(--font-size-3xl);font-weight:700;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.stat-label{color:var(--color-text-secondary);font-size:var(--font-size-sm);margin-top:var(--spacing-xs)}.level-tag{display:inline-flex;align-items:center;padding:2px 8px;border-radius:var(--radius-full);font-size:var(--font-size-xs);font-weight:500}.level-tag.junior{background:#10b98126;color:#059669}.level-tag.senior{background:#6366f126;color:var(--color-primary)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-2xl);text-align:center;color:var(--color-text-muted)}.empty-state-icon{font-size:48px;margin-bottom:var(--spacing-md)}.spinner{width:40px;height:40px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}.quiz-options{display:flex;flex-direction:column;gap:var(--spacing-md)}.quiz-option{padding:var(--spacing-md);border:2px solid var(--color-border);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);text-align:left}.quiz-option:hover{border-color:var(--color-primary);background:#6366f10d}.quiz-option.correct{border-color:var(--color-success);background:#10b9811a}.quiz-option.wrong{border-color:var(--color-error);background:#ef44441a}.quiz-option.selected{border-color:var(--color-primary);background:#6366f11a}.plan-card{position:relative;overflow:hidden}.plan-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--gradient-primary)}.tabs{display:flex;gap:var(--spacing-sm);border-bottom:1px solid var(--color-border);margin-bottom:var(--spacing-lg);overflow-x:auto;-webkit-overflow-scrolling:touch}.tab{padding:var(--spacing-md);color:var(--color-text-secondary);font-weight:500;border-bottom:2px solid transparent;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap}.tab:hover{color:var(--color-text)}.tab.active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.modal-overlay{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:var(--spacing-md)}.modal{background:var(--color-bg-card);border-radius:var(--radius-xl);max-width:500px;width:100%;max-height:90vh;overflow-y:auto;animation:fadeIn var(--transition-base)}.modal-header{padding:var(--spacing-lg);border-bottom:1px solid var(--color-border);display:flex;justify-content:space-between;align-items:center}.modal-body{padding:var(--spacing-lg)}.modal-footer{padding:var(--spacing-lg);border-top:1px solid var(--color-border);display:flex;gap:var(--spacing-md);justify-content:flex-end}.toast{position:fixed;bottom:100px;left:50%;transform:translate(-50%);background:var(--color-bg-card);padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-md);box-shadow:var(--shadow-xl);z-index:1001;animation:fadeIn var(--transition-base)}.hero{padding:var(--spacing-2xl) 0;text-align:center;background:var(--gradient-primary);color:#fff;border-radius:var(--radius-xl);margin-bottom:var(--spacing-xl)}.hero h1{margin-bottom:var(--spacing-md)}.hero p{opacity:.9;max-width:600px;margin:0 auto var(--spacing-lg)}.phonetic{color:var(--color-text-muted);font-family:Times New Roman,serif;font-size:var(--font-size-lg)}.example{padding:var(--spacing-md);background:var(--color-bg);border-radius:var(--radius-md);border-left:3px solid var(--color-primary);margin:var(--spacing-sm) 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var(--color-border);position:sticky;top:0;z-index:50}.nav{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md) 0;gap:var(--spacing-lg)}.nav-brand{font-size:var(--font-size-xl);font-weight:700;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;display:flex;align-items:center;gap:var(--spacing-sm);text-decoration:none}.nav-links{display:flex;gap:var(--spacing-sm);list-style:none;flex:1;justify-content:center}.nav-link{color:var(--color-text-secondary);font-weight:500;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);transition:all var(--transition-fast);display:flex;align-items:center;gap:var(--spacing-xs);text-decoration:none;position:relative}.nav-link:hover,.nav-link.active{color:var(--color-primary);background:#6366f11a}.nav-badge{background:var(--color-error);color:#fff;font-size:10px;font-weight:600;padding:2px 6px;border-radius:var(--radius-full);margin-left:4px}.nav-actions{display:flex;align-items:center;gap:var(--spacing-md)}.streak{display:flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-md);background:linear-gradient(135deg,#ff9a56,#ff6b6b);color:#fff;border-radius:var(--radius-md);font-weight:600;font-size:var(--font-size-sm)}.streak-icon{font-size:var(--font-size-lg)}.theme-toggle{background:var(--color-bg-hover);border:none;width:40px;height:40px;border-radius:50%;font-size:20px;cursor:pointer;transition:all var(--transition-fast);display:flex;align-items:center;justify-content:center}.theme-toggle:hover{background:var(--color-border);transform:rotate(15deg)}.main-content{flex:1;padding:var(--spacing-xl) 0}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:var(--color-bg-card);border-top:1px solid var(--color-border);display:none;justify-content:space-around;padding:var(--spacing-sm) 0;padding-bottom:max(var(--spacing-sm),env(safe-area-inset-bottom));z-index:100}.bottom-nav-item{display:flex;flex-direction:column;align-items:center;gap:2px;color:var(--color-text-muted);font-size:var(--font-size-xs);padding:var(--spacing-xs) var(--spacing-sm);text-decoration:none;transition:color var(--transition-fast);position:relative}.bottom-nav-item.active,.bottom-nav-item:hover{color:var(--color-primary)}.bottom-nav-icon{font-size:22px;position:relative}.mobile-badge{position:absolute;top:-6px;right:-10px;background:var(--color-error);color:#fff;font-size:10px;font-weight:600;padding:1px 5px;border-radius:var(--radius-full);min-width:16px;text-align:center}@media(max-width:768px){.bottom-nav{display:flex}.nav-links,.nav-actions .streak{display:none}.main-content{padding-bottom:100px}.header{position:relative}}.progress-ring{position:relative;display:inline-flex;align-items:center;justify-content:center}.progress-ring__bg{stroke:var(--color-border)}.progress-ring__content{position:absolute;display:flex;flex-direction:column;align-items:center;justify-content:center}.progress-ring__value{font-size:var(--font-size-xl);font-weight:700;color:var(--color-text)}.progress-ring__label{font-size:var(--font-size-xs);color:var(--color-text-secondary);margin-top:2px}.home{display:flex;flex-direction:column;gap:var(--spacing-xl)}.hero{text-align:center;padding:var(--spacing-2xl) var(--spacing-lg);background:var(--gradient-primary);border-radius:var(--radius-xl);color:#fff}.hero h1{font-size:var(--font-size-4xl);margin-bottom:var(--spacing-md)}.hero p{font-size:var(--font-size-lg);opacity:.9;max-width:500px;margin:0 auto var(--spacing-lg)}.hero-actions{display:flex;gap:var(--spacing-md);justify-content:center;flex-wrap:wrap}.hero .btn-outline{border-color:#fff;color:#fff}.hero .btn-outline:hover{background:#fff;color:var(--color-primary)}.stats-section{margin:0 calc(-1 * var(--spacing-md));padding:0 var(--spacing-md)}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--spacing-md)}.stat-card{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-md);padding:var(--spacing-lg)}.stat-details{text-align:center}.stat-main{font-size:var(--font-size-2xl);font-weight:700;color:var(--color-text)}.stat-sub{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.streak-card,.review-card{justify-content:center}.streak-display,.review-display{display:flex;align-items:center;gap:var(--spacing-sm)}.streak-fire{font-size:48px}.streak-number,.review-number{font-size:var(--font-size-4xl);font-weight:700;background:linear-gradient(135deg,#ff9a56,#ff6b6b);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.review-icon{font-size:48px}.review-number{background:var(--gradient-primary);-webkit-background-clip:text;background-clip:text}.streak-label,.review-label{color:var(--color-text-secondary);font-size:var(--font-size-sm);margin:0}.weekly-section{padding:var(--spacing-lg)}.weekly-section h3{margin-bottom:var(--spacing-lg);font-size:var(--font-size-lg)}.weekly-chart{display:flex;justify-content:space-between;align-items:flex-end;height:150px;gap:var(--spacing-sm);padding:var(--spacing-md) 0}.chart-bar-wrapper{flex:1;display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);height:100%}.chart-bar-wrapper.today .chart-label{color:var(--color-primary);font-weight:600}.chart-bar{width:100%;max-width:40px;border-radius:var(--radius-sm) var(--radius-sm) 0 0;display:flex;flex-direction:column;overflow:hidden;transition:height var(--transition-slow)}.bar-learned{background:var(--gradient-primary)}.bar-reviewed{background:linear-gradient(135deg,#10b981,#34d399)}.chart-label{font-size:var(--font-size-xs);color:var(--color-text-secondary)}.chart-value{font-size:var(--font-size-xs);font-weight:600;color:var(--color-text)}.chart-legend{display:flex;justify-content:center;gap:var(--spacing-lg);margin-top:var(--spacing-md);padding-top:var(--spacing-md);border-top:1px solid var(--color-border)}.legend-item{display:flex;align-items:center;gap:var(--spacing-xs);font-size:var(--font-size-sm);color:var(--color-text-secondary)}.legend-dot{width:12px;height:12px;border-radius:2px}.legend-dot.learned{background:var(--gradient-primary)}.legend-dot.reviewed{background:linear-gradient(135deg,#10b981,#34d399)}.quick-actions h3{margin-bottom:var(--spacing-md);font-size:var(--font-size-lg)}.action-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--spacing-md)}.action-card{padding:var(--spacing-lg);text-align:center;text-decoration:none;transition:all var(--transition-fast)}.action-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-glow)}.action-icon{font-size:36px;display:block;margin-bottom:var(--spacing-sm)}.action-card h4{color:var(--color-text);margin:0 0 var(--spacing-xs);font-size:var(--font-size-base)}.action-card p{color:var(--color-text-secondary);margin:0;font-size:var(--font-size-sm)}@media(max-width:1024px){.stats-grid,.action-cards{grid-template-columns:repeat(2,1fr)}}@media(max-width:640px){.hero{padding:var(--spacing-xl) var(--spacing-md)}.hero h1{font-size:var(--font-size-2xl)}.hero p{font-size:var(--font-size-base)}.stats-grid{grid-template-columns:1fr 1fr}.stat-card{padding:var(--spacing-md)}.action-cards{grid-template-columns:1fr 1fr}.weekly-chart{height:120px}}.word-card{width:100%;max-width:400px;height:450px;perspective:1000px;cursor:pointer;margin:0 auto}.word-card-inner{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}.word-card.flipped .word-card-inner{transform:rotateY(180deg)}.word-card-front,.word-card-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:var(--radius-xl);background:var(--color-bg-card);box-shadow:var(--shadow-lg);padding:var(--spacing-lg);display:flex;flex-direction:column;overflow-y:auto}.word-card-back{transform:rotateY(180deg)}.word-card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-md)}.favorite-btn{background:none;border:none;font-size:24px;cursor:pointer;color:var(--color-text-muted);transition:all var(--transition-fast);padding:var(--spacing-xs)}.favorite-btn:hover,.favorite-btn.active{color:#fbbf24;transform:scale(1.1)}.word-main{text-align:center;flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:var(--spacing-sm)}.word-main.compact{flex:0;margin-bottom:var(--spacing-md)}.word-text{font-size:var(--font-size-4xl);font-weight:700;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:0}.phonetic{font-family:Times New Roman,serif;font-size:var(--font-size-lg);color:var(--color-text-secondary);margin:0}.speak-btn{background:#6366f11a;border:none;width:48px;height:48px;border-radius:50%;font-size:24px;cursor:pointer;transition:all 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