.container{width:100%;margin-left:auto;margin-right:auto;padding-left:var(--spacing-lg);padding-right:var(--spacing-lg)}.container-sm{max-width:640px}.container-md{max-width:1024px}.container-lg{max-width:1280px}.container-full{max-width:100%}@media (max-width: 768px){.container{padding-left:var(--spacing-md);padding-right:var(--spacing-md)}}.card{background:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:all var(--transition-fast)}.card-default{background:var(--color-surface)}.card-padding-none{padding:0}.card-padding-sm{padding:var(--spacing-sm)}.card-padding-md{padding:var(--spacing-md)}.card-padding-lg{padding:var(--spacing-lg)}.card-hover:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.card-clickable{cursor:pointer;-webkit-user-select:none;user-select:none}.card-clickable:active{transform:scale(.98)}.card-outlined{background:transparent;border:2px solid var(--color-border);box-shadow:none}.card-elevated{box-shadow:var(--shadow-xl)}.mode-card{position:relative;min-height:120px;background:var(--color-surface)!important;border:2px solid var(--color-border);transition:all var(--transition-fast);overflow:hidden}.mode-card:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(135deg,transparent 0%,rgba(99,102,241,.03) 100%);opacity:0;transition:opacity var(--transition-fast)}.mode-card:hover{border-color:var(--color-primary);box-shadow:0 4px 12px #6366f126;transform:translateY(-2px)}.mode-card:hover:before{opacity:1}.mode-card-content{display:flex;flex-direction:column;align-items:center;text-align:center;height:100%;padding:var(--spacing-sm);position:relative;z-index:1}.mode-card-icon{font-size:2.5rem;margin-bottom:var(--spacing-sm)}.mode-card:hover .mode-card-icon{transform:scale(1.1);transition:transform var(--transition-fast)}.mode-card-title{font-size:1rem;font-weight:600;margin-bottom:var(--spacing-xs);color:var(--color-text)}.mode-card-description{font-size:.875rem;color:var(--color-text-light);margin-bottom:0;line-height:1.4}.mode-card-badge{position:absolute;top:var(--spacing-md);right:var(--spacing-md);background:#ffffff4d;color:#fff;padding:.25rem .75rem;border-radius:var(--radius-full);font-size:.75rem;font-weight:600;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.mode-card-disabled{opacity:.6;cursor:not-allowed}.mode-card-disabled:hover{transform:none;box-shadow:var(--shadow-md)}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 768px){.mode-card{min-height:100px}.mode-card-content{padding:var(--spacing-xs)}.mode-card-icon{font-size:1.75rem}.mode-card-title{font-size:.75rem}.mode-card-description{font-size:.7rem}}.badge{display:inline-flex;align-items:center;gap:var(--spacing-xs);font-family:var(--font-primary);font-weight:600;border-radius:var(--radius-full);white-space:nowrap}.badge-sm{padding:.25rem .625rem;font-size:.75rem}.badge-md{padding:.375rem .875rem;font-size:.875rem}.badge-lg{padding:.5rem 1rem;font-size:1rem}.badge-default{background-color:var(--color-border);color:var(--color-text)}.badge-primary{background-color:var(--color-primary);color:#fff}.badge-secondary{background-color:var(--color-secondary);color:#fff}.badge-success{background-color:var(--color-success);color:#fff}.badge-error{background-color:var(--color-error);color:#fff}.badge-outline{background-color:transparent;border:2px solid currentColor}.badge-icon{display:inline-flex;font-size:1.1em}.badge-clickable{cursor:pointer;transition:all var(--transition-normal);-webkit-user-select:none;user-select:none}.badge-clickable:hover{transform:translateY(-2px);box-shadow:0 4px 8px #00000026}.badge-clickable:active{transform:translateY(0)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);font-family:var(--font-primary);font-weight:600;border:none;border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-normal);text-decoration:none;position:relative;overflow:hidden;white-space:nowrap}.btn:before{content:"";position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;background:#ffffff4d;transform:translate(-50%,-50%);transition:width .6s,height .6s}.btn:active:before{width:300px;height:300px}.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn:active{transform:translateY(0)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn:disabled:hover{transform:none;box-shadow:none}.btn-sm{padding:var(--spacing-sm) var(--spacing-md);font-size:.875rem}.btn-md{padding:var(--spacing-md) var(--spacing-xl);font-size:1rem}.btn-lg{padding:var(--spacing-lg) var(--spacing-2xl);font-size:1.125rem}.btn-primary{background:var(--color-primary);color:#fff;box-shadow:var(--shadow-sm)}.btn-primary:hover{background:var(--color-primary-dark);box-shadow:var(--shadow-md)}.btn-secondary{background:var(--color-secondary);color:#fff;box-shadow:var(--shadow-sm)}.btn-secondary:hover{background:var(--color-secondary-dark);box-shadow:var(--shadow-md)}.btn-success{background:var(--color-success);color:#fff;box-shadow:var(--shadow-sm)}.btn-success:hover{background:#059669;box-shadow:var(--shadow-md)}.btn-outline{background:transparent;color:var(--color-primary);border:2px solid var(--color-primary);box-shadow:none}.btn-outline:hover{background:var(--color-primary);color:#fff}.btn-ghost{background:transparent;color:var(--color-text);box-shadow:none}.btn-ghost:hover{background:var(--color-bg)}.btn-danger{background:var(--color-error);color:#fff;box-shadow:var(--shadow-sm)}.btn-danger:hover{background:#dc2626;box-shadow:var(--shadow-md)}.btn-full{width:100%}.btn-icon{display:inline-flex;align-items:center;font-size:1.2em}.btn-text{position:relative;z-index:1}.theme-toggle{position:relative;width:60px;height:32px;background:none;border:none;cursor:pointer;padding:0;transition:all var(--transition-normal)}.theme-toggle:hover{transform:scale(1.05)}.theme-toggle:focus-visible{outline:2px solid var(--color-primary);outline-offset:4px;border-radius:var(--radius-full)}.theme-toggle-track{width:100%;height:100%;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:var(--radius-full);position:relative;box-shadow:inset 0 2px 4px #0003;transition:all var(--transition-normal)}.theme-toggle.dark .theme-toggle-track{background:linear-gradient(135deg,#1e293b,#334155)}.theme-toggle-thumb{position:absolute;top:50%;transform:translateY(-50%);left:4px;width:24px;height:24px;background:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;transition:all var(--transition-normal);box-shadow:0 2px 4px #0003}.theme-toggle.dark .theme-toggle-thumb{left:calc(100% - 28px);background:#0f172a}.theme-toggle:active .theme-toggle-thumb{width:28px}.install-pwa-overlay{position:fixed;bottom:20px;right:20px;z-index:9999;animation:slideInFromRight .5s ease-out,pulse 2s ease-in-out 1s infinite}.install-pwa-card{background:var(--color-surface);border:3px solid var(--color-primary);border-radius:var(--radius-lg);box-shadow:0 10px 40px #6366f14d,var(--shadow-xl);padding:var(--spacing-lg);max-width:380px;position:relative;animation:float 3s ease-in-out infinite}.install-pwa-close{position:absolute;top:var(--spacing-sm);right:var(--spacing-sm);background:transparent;border:none;font-size:1.5rem;color:var(--color-text-light);cursor:pointer;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-md);transition:all var(--transition-fast)}.install-pwa-close:hover{background:#ef44441a;color:var(--color-error);transform:scale(1.1)}.install-pwa-lang-switch{position:absolute;top:var(--spacing-sm);left:var(--spacing-sm);background:var(--color-primary);color:#fff;border:none;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-md);font-size:.75rem;font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.install-pwa-lang-switch:hover{background:var(--color-primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-md)}.install-pwa-header{text-align:center;margin-bottom:var(--spacing-lg);margin-top:var(--spacing-md)}.install-pwa-icon{font-size:3rem;margin-bottom:var(--spacing-sm);animation:bounce 2s ease-in-out infinite}.install-pwa-title{font-size:1.25rem;font-weight:700;color:var(--color-text);margin:0;line-height:1.4}.install-pwa-benefits{margin-bottom:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-sm)}.install-pwa-benefit{font-size:.875rem;color:var(--color-text);padding:var(--spacing-sm);background:#6366f10d;border-radius:var(--radius-md);border-left:3px solid var(--color-primary);animation:slideInFromLeft .5s ease-out 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var(--transition-fast);border:none;width:100%}.install-primary{background:var(--color-primary);color:#fff;box-shadow:var(--shadow-md)}.install-primary:hover{background:var(--color-primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.install-secondary{background:transparent;color:var(--color-text-light);border:1px solid var(--color-border)}.install-secondary:hover{background:var(--color-bg);color:var(--color-text)}.install-pwa-arrow{position:absolute;bottom:-40px;right:30px;color:var(--color-primary);animation:bounce 1.5s ease-in-out infinite;filter:drop-shadow(0 2px 4px rgba(99,102,241,.3))}@keyframes slideInFromRight{0%{transform:translate(120%);opacity:0}to{transform:translate(0);opacity:1}}@keyframes slideInFromLeft{0%{transform:translate(-20px);opacity:0}to{transform:translate(0);opacity:1}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.02)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}@media (max-width: 768px){.install-pwa-overlay{bottom:10px;right:10px;left:10px}.install-pwa-card{max-width:100%;padding:var(--spacing-md)}.install-pwa-icon{font-size:2.5rem}.install-pwa-title{font-size:1.125rem}.install-pwa-arrow{display:none}}@media (max-width: 480px){.install-pwa-card{padding:var(--spacing-sm)}.install-pwa-benefit{font-size:.8125rem}.install-pwa-step{font-size:.75rem}}.home{min-height:100vh;padding:var(--spacing-md) 0;background:var(--color-bg)}.top-bar{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md);background:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);margin-bottom:var(--spacing-md);gap:var(--spacing-md);border:1px solid var(--color-border)}.top-bar-left{display:flex;align-items:center;gap:var(--spacing-sm);min-width:0}.logo-compact{font-size:1.5rem;flex-shrink:0}.logo-text-compact{font-size:1.25rem;font-weight:700;margin:0;color:var(--color-primary);white-space:nowrap}.top-bar-center{flex:1;display:flex;justify-content:center;min-width:0}.language-selection{display:flex;align-items:center;gap:var(--spacing-md)}.language-group{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs)}.language-label{font-size:.75rem;font-weight:600;color:var(--color-text-light);text-transform:uppercase;letter-spacing:.5px}.language-flags{display:flex;align-items:center;gap:var(--spacing-xs)}.arrow-large{color:var(--color-primary);font-size:1.5rem;font-weight:700;margin:0 var(--spacing-sm)}.flag-btn{background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius-md);font-size:1.5rem;padding:var(--spacing-xs);cursor:pointer;transition:all var(--transition-fast);width:44px;height:44px;display:flex;align-items:center;justify-content:center;position:relative;font-family:"Apple Color Emoji","Segoe UI Emoji","Noto Color Emoji","Android Emoji",EmojiSymbols,EmojiOne Color,Twemoji Mozilla,sans-serif}.flag-btn:after{content:"";position:absolute;top:-2px;right:-2px;bottom:-2px;left:-2px;border-radius:var(--radius-md);border:2px solid transparent;transition:all var(--transition-fast)}.flag-btn:hover{transform:scale(1.05);border-color:var(--color-primary)}.flag-btn:hover:after{border-color:var(--color-primary-light);transform:scale(1.1)}.flag-btn.active{border-color:var(--color-primary);background:#6366f11a;box-shadow:0 0 0 3px #6366f11a}.flag-btn:active{transform:scale(.95)}.arrow-small{color:var(--color-text-light);font-size:1rem;margin:0 var(--spacing-xs)}.top-bar-right{display:flex;align-items:center;gap:var(--spacing-sm)}.stats-compact{display:flex;align-items:center;justify-content:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);margin-bottom:var(--spacing-lg);flex-wrap:wrap;border:1px solid var(--color-border)}.stat-compact{display:flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-md);transition:all var(--transition-fast)}.stat-compact:hover{background:#6366f10d}.stat-icon{font-size:1.25rem;filter:grayscale(20%)}.stat-num{font-size:1.25rem;font-weight:700;color:var(--color-primary);min-width:1.5rem;text-align:center}.srs-daily-card{background:var(--color-surface);padding:var(--spacing-lg);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:2px solid var(--color-primary);margin-bottom:var(--spacing-lg);animation:slideInRight .4s ease-out}.srs-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-md)}.srs-title{font-size:1.125rem;font-weight:700;color:var(--color-text);margin:0}.srs-description{color:var(--color-text-light);font-size:.875rem;margin-bottom:var(--spacing-md);line-height:1.5}.srs-progress-info{display:flex;gap:var(--spacing-lg);margin-bottom:var(--spacing-lg);font-size:.875rem;color:var(--color-text-light)}.wotd-card{background:var(--color-surface);padding:var(--spacing-lg);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:2px solid var(--color-warning);margin-bottom:var(--spacing-lg);animation:slideInLeft .4s ease-out}.wotd-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-lg)}.wotd-title{font-size:1.125rem;font-weight:700;color:var(--color-text);margin:0}.wotd-content{margin-bottom:var(--spacing-lg)}.wotd-word{text-align:center;margin-bottom:var(--spacing-lg);padding:var(--spacing-lg);background:#facc150d;border-radius:var(--radius-md);border:1px solid rgba(250,204,21,.2)}.wotd-lang-label{display:block;font-size:.75rem;font-weight:600;text-transform:uppercase;color:var(--color-text-light);margin-bottom:var(--spacing-xs);letter-spacing:.5px}.wotd-word-text{font-size:2rem;font-weight:700;color:var(--color-warning);margin:var(--spacing-sm) 0}.wotd-pronunciation{font-size:.875rem;color:var(--color-text-light);font-style:italic;margin:0}.wotd-translation{text-align:center;margin-bottom:var(--spacing-md);padding:var(--spacing-md);background:#6366f10d;border-radius:var(--radius-md);border:1px solid rgba(99,102,241,.2)}.wotd-translation-text{font-size:1.5rem;font-weight:600;color:var(--color-primary);margin:var(--spacing-xs) 0}.wotd-meta{display:flex;justify-content:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-md)}.wotd-reviewed{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-md);background:#22c55e1a;border-radius:var(--radius-md);color:var(--color-success);font-weight:600}.wotd-check{font-size:1.5rem}.wotd-compact{padding:var(--spacing-md);animation:slideInDown .3s ease-out}.wotd-compact .wotd-title{font-size:1rem}.wotd-content-compact{margin-bottom:0}.wotd-words-row{display:flex;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-md);padding:var(--spacing-md);background:#6366f10d;border-radius:var(--radius-md)}.wotd-word-compact,.wotd-translation-compact{flex:1;text-align:center}.wotd-text-large{font-size:1.5rem;font-weight:700;color:var(--color-primary);display:block}.wotd-pronunciation-small{font-size:.75rem;color:var(--color-text-light);font-style:italic;display:block;margin-top:var(--spacing-xs)}.wotd-separator{font-size:1.25rem;color:var(--color-text-light);font-weight:600}.wotd-meta-compact{display:flex;justify-content:space-between;align-items:center;gap:var(--spacing-sm);flex-wrap:wrap}@keyframes slideInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.filter-section,.modes-section{margin-bottom:var(--spacing-lg)}.section-title-compact{font-size:.875rem;font-weight:600;margin-bottom:var(--spacing-sm);text-transform:uppercase;color:var(--color-text-light);letter-spacing:.5px}.section-title{font-size:1.25rem;font-weight:700;margin-bottom:var(--spacing-md);color:var(--color-text)}.stats-achievements{display:flex;align-items:center;justify-content:center;gap:var(--spacing-lg);padding:var(--spacing-lg);background:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);margin-top:var(--spacing-lg);flex-wrap:wrap;border:1px solid var(--color-border)}.stat-compact{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-sm);transition:all var(--transition-fast)}.stat-label-small{font-size:.75rem;color:var(--color-text-light);font-weight:500}.filter-grid,.category-grid{display:flex;gap:var(--spacing-sm);flex-wrap:wrap;background:var(--color-surface);padding:var(--spacing-md);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--color-border)}.category-badge{cursor:pointer;transition:all var(--transition-fast)}.category-badge:hover{transform:translateY(-1px)}.modes-grid-compact{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:var(--spacing-md)}@media (max-width: 768px){.home{padding:var(--spacing-sm) 0}.top-bar{padding:var(--spacing-sm);gap:var(--spacing-xs);flex-wrap:wrap}.top-bar-left{order:1}.top-bar-center{order:3;flex-basis:100%;margin-top:var(--spacing-xs)}.top-bar-right{order:2}.logo-text-compact{font-size:1rem}.logo-compact{font-size:1.25rem}.flag-btn{width:40px;height:40px;font-size:1.25rem}.arrow-small{font-size:.875rem}.stats-compact{padding:var(--spacing-sm);gap:var(--spacing-sm)}.stat-compact{min-width:50px}.stat-icon,.stat-num{font-size:1rem}.section-title-compact{font-size:.75rem}.modes-grid-compact{grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:var(--spacing-sm)}.filter-grid,.category-grid{padding:var(--spacing-sm);gap:var(--spacing-xs)}}@media (max-width: 480px){.modes-grid-compact{grid-template-columns:repeat(2,1fr)}.top-bar-center{justify-content:flex-start}.language-flags{gap:var(--spacing-xs)}.flag-btn{width:36px;height:36px;font-size:1.125rem}}.study-mode{min-height:100vh;padding-top:80px;padding-bottom:var(--spacing-xl);background:var(--color-bg);animation:fadeIn .4s ease-out}.study-header-sticky{position:fixed;top:0;left:0;right:0;z-index:100;background:var(--color-bg);padding:var(--spacing-xs) var(--spacing-md);box-shadow:0 2px 10px #0000001a;animation:slideInDown .4s ease-out;max-width:100%}.study-header{display:flex;justify-content:space-between;align-items:center;gap:var(--spacing-md);background:var(--color-surface);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--color-border);box-shadow:var(--shadow-sm)}@keyframes slideInDown{0%{transform:translateY(-100%);opacity:0}to{transform:translateY(0);opacity:1}}.study-title{font-size:1.5rem;font-weight:700;color:var(--color-text);margin:0;flex:1;text-align:center}.study-stats-mini{display:flex;gap:var(--spacing-sm)}.study-progress-standalone{background:var(--color-surface);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--color-border);box-shadow:var(--shadow-sm);margin-bottom:var(--spacing-lg)}.study-progress{background:var(--color-surface);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--color-border);box-shadow:var(--shadow-sm)}.progress-bar{width:100%;height:20px;background:#0003;border-radius:var(--radius-full);overflow:hidden;margin-bottom:var(--spacing-md);box-shadow:inset 0 2px 8px #0003;position:relative}.progress-bar:after{content:"";position:absolute;top:0;left:0;right:0;height:50%;background:linear-gradient(180deg,rgba(255,255,255,.2) 0%,transparent 100%);border-radius:var(--radius-full)}.progress-fill{height:100%;background:var(--color-primary);border-radius:var(--radius-full);transition:width .6s cubic-bezier(.4,0,.2,1);box-shadow:0 0 20px #10b98199;position:relative;overflow:hidden}.progress-text{text-align:center;color:#fff;font-weight:700;font-size:1rem;text-shadow:0 2px 4px rgba(0,0,0,.2);letter-spacing:.5px}.study-accuracy{text-align:center;margin-bottom:var(--spacing-2xl);color:#fff;font-size:1.25rem;background:#ffffff1a;padding:var(--spacing-lg);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:scaleIn .5s ease-out .2s both}.accuracy-label{font-weight:600;margin-right:var(--spacing-sm);opacity:.9}.accuracy-value{font-weight:900;font-size:2rem;display:inline-block;animation:pulse 2s ease-in-out infinite}.accuracy-value.good{color:#6ee7b7;text-shadow:0 0 20px rgba(110,231,183,.8),0 0 40px rgba(110,231,183,.4)}.accuracy-value.needs-work{color:#fde047;text-shadow:0 0 20px rgba(253,224,71,.8),0 0 40px rgba(253,224,71,.4)}.study-card-container{display:flex;flex-direction:column;gap:var(--spacing-2xl);margin-bottom:var(--spacing-3xl);min-height:450px;perspective:1000px}.study-card{animation:cardFlipIn .6s cubic-bezier(.34,1.56,.64,1) both;transform-style:preserve-3d;box-shadow:0 20px 60px #0000004d,0 0 0 1px #ffffff1a inset}@keyframes cardFlipIn{0%{transform:rotateY(-90deg) scale(.8);opacity:0}to{transform:rotateY(0) scale(1);opacity:1}}.study-card-content,.study-answer-content{text-align:center;padding:var(--spacing-3xl) var(--spacing-2xl)}.study-question-label,.study-answer-label{font-size:1rem;font-weight:700;text-transform:uppercase;letter-spacing:2px;margin-bottom:var(--spacing-xl);opacity:.95;text-shadow:0 2px 4px rgba(0,0,0,.2)}.study-question,.study-answer{font-size:3.5rem;font-weight:900;margin-bottom:var(--spacing-lg);word-wrap:break-word;line-height:1.2;text-shadow:0 4px 12px rgba(0,0,0,.3);animation:textGlow 3s ease-in-out infinite}@keyframes textGlow{0%,to{text-shadow:0 4px 12px rgba(0,0,0,.3)}50%{text-shadow:0 4px 20px rgba(255,255,255,.3),0 0 30px rgba(255,255,255,.2)}}.study-pronunciation{font-size:1.25rem;font-style:italic;opacity:.9;margin-bottom:var(--spacing-xl);text-shadow:0 2px 4px rgba(0,0,0,.2)}.study-meta{display:flex;gap:var(--spacing-md);justify-content:center;margin-top:var(--spacing-xl)}.study-answer-card{animation:answerReveal .5s cubic-bezier(.34,1.56,.64,1) both;box-shadow:0 20px 60px #0000004d,0 0 0 1px #ffffff1a inset}@keyframes answerReveal{0%{transform:scale(.8) translateY(20px);opacity:0}to{transform:scale(1) translateY(0);opacity:1}}.study-actions{margin-bottom:var(--spacing-3xl);animation:slideInRight .5s ease-out .3s both}.study-answer-buttons{display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-xl)}.study-answer-buttons button{transform:scale(1);transition:all var(--transition-normal)}.study-answer-buttons button:hover:not(:disabled){transform:scale(1.05) translateY(-4px);box-shadow:0 12px 24px #0000004d}.study-answer-buttons button:active:not(:disabled){transform:scale(.98)}.study-session-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-xl);background:#ffffff26;padding:var(--spacing-2xl);border-radius:var(--radius-2xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:slideInLeft .5s ease-out .4s both}.session-stat{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);color:#fff;padding:var(--spacing-lg);border-radius:var(--radius-xl);background:#ffffff1a;transition:all var(--transition-normal)}.session-stat:hover{transform:translateY(-4px);background:#ffffff26;box-shadow:0 8px 16px #0003}.session-stat-icon{font-size:2.5rem;animation:bounce 2s ease-in-out infinite;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3))}.session-stat-value{font-size:2.5rem;font-weight:900;text-shadow:0 2px 8px rgba(0,0,0,.3)}.session-stat-label{font-size:.875rem;opacity:.9;text-transform:uppercase;letter-spacing:1px;font-weight:600}@keyframes celebrate{0%,to{transform:scale(1) rotate(0)}25%{transform:scale(1.1) rotate(-5deg)}75%{transform:scale(1.1) rotate(5deg)}}@keyframes shake{0%,to{transform:translate(0)}10%,30%,50%,70%,90%{transform:translate(-10px)}20%,40%,60%,80%{transform:translate(10px)}}@media (max-width: 768px){.study-mode{padding:var(--spacing-md) 0}.study-header{flex-wrap:wrap;padding:var(--spacing-md)}.study-title{width:100%;order:-1;margin-bottom:var(--spacing-sm);font-size:1.5rem}.study-question,.study-answer{font-size:2.5rem}.study-answer-buttons{grid-template-columns:1fr;gap:var(--spacing-md)}.study-session-stats{grid-template-columns:repeat(3,1fr);gap:var(--spacing-md);padding:var(--spacing-lg)}.session-stat{padding:var(--spacing-md)}.session-stat-icon{font-size:2rem}.session-stat-value{font-size:1.75rem}.session-stat-label{font-size:.75rem}.study-card-content,.study-answer-content{padding:var(--spacing-2xl) var(--spacing-lg)}}.multiple-choice{min-height:100vh;padding:var(--spacing-xl) 0;background:var(--color-bg);animation:fadeIn .4s ease-out}.mc-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);gap:var(--spacing-md);background:var(--color-surface);padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-lg);border:1px solid var(--color-border);box-shadow:var(--shadow-sm);animation:slideInRight .5s ease-out}.mc-title{font-size:1.5rem;font-weight:700;color:var(--color-text);margin:0;flex:1;text-align:center}.mc-stats-mini{display:flex;gap:var(--spacing-sm)}.mc-progress{margin-bottom:var(--spacing-xl);background:var(--color-surface);padding:var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--color-border);box-shadow:var(--shadow-sm);animation:slideInLeft .5s ease-out .1s both}.mc-accuracy{text-align:center;margin-bottom:var(--spacing-xl);color:var(--color-text);font-size:1.25rem;background:var(--color-surface);padding:var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--color-border);box-shadow:var(--shadow-sm);animation:scaleIn .5s ease-out .2s both}.mc-question-card{margin-bottom:var(--spacing-3xl);animation:cardFlipIn .6s cubic-bezier(.34,1.56,.64,1) both;box-shadow:0 20px 60px #0000004d,0 0 0 1px #ffffff1a inset}.mc-question-content{text-align:center;padding:var(--spacing-3xl) var(--spacing-2xl)}.mc-question-label{font-size:1rem;font-weight:700;text-transform:uppercase;letter-spacing:2px;margin-bottom:var(--spacing-xl);opacity:.95;text-shadow:0 2px 4px rgba(0,0,0,.2)}.mc-question{font-size:3.5rem;font-weight:900;margin-bottom:var(--spacing-lg);word-wrap:break-word;line-height:1.2;text-shadow:0 4px 12px rgba(0,0,0,.3)}.mc-pronunciation{font-size:1.25rem;font-style:italic;opacity:.9;margin-bottom:var(--spacing-xl);text-shadow:0 2px 4px rgba(0,0,0,.2)}.mc-meta{display:flex;gap:var(--spacing-md);justify-content:center;margin-top:var(--spacing-xl)}.mc-choices{display:grid;grid-template-columns:1fr;gap:var(--spacing-lg);margin-bottom:var(--spacing-3xl);animation:slideInRight .5s ease-out .3s both}.choice-button:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,transparent 0%,rgba(79,172,254,.1) 50%,transparent 100%);transform:translate(-100%);transition:transform .6s}.choice-button:hover:not(:disabled){transform:translateY(-4px);box-shadow:0 8px 24px #0003;border-color:#4facfe80}.choice-letter{display:flex;align-items:center;justify-content:center;width:48px;height:48px;background:linear-gradient(135deg,#4facfe,#00f2fe);color:#fff;border-radius:var(--radius-lg);font-size:1.5rem;font-weight:800;flex-shrink:0;box-shadow:0 4px 8px #0003}.mc-score{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-xl);background:#ffffff26;padding:var(--spacing-2xl);border-radius:var(--radius-2xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:slideInLeft .5s ease-out .4s both}@media (max-width: 768px){.multiple-choice{padding:var(--spacing-md) 0}.mc-header{flex-wrap:wrap;padding:var(--spacing-md)}.mc-title{width:100%;order:-1;margin-bottom:var(--spacing-sm);font-size:1.5rem}.mc-question{font-size:2.5rem}.mc-score{grid-template-columns:repeat(3,1fr);gap:var(--spacing-md);padding:var(--spacing-lg)}.score-item{padding:var(--spacing-md)}.score-icon{font-size:2rem}.score-value{font-size:1.75rem}.score-label{font-size:.75rem}.choice-button{padding:var(--spacing-lg);font-size:1rem}.choice-letter{width:40px;height:40px;font-size:1.25rem}}.progress-bar{width:100%;height:12px;background:#fff3;border-radius:100px;overflow:hidden;position:relative;box-shadow:0 2px 8px #0000001a inset}.progress-fill{height:100%;background:linear-gradient(90deg,var(--color-primary) 0%,var(--color-secondary) 100%);border-radius:100px;transition:width .4s cubic-bezier(.4,0,.2,1);position:relative;box-shadow:0 0 10px #6366f180}.progress-fill:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,transparent 0%,rgba(255,255,255,.3) 50%,transparent 100%);animation:shimmer 2s infinite}@keyframes shimmer{0%{transform:translate(-100%)}to{transform:translate(100%)}}.typing-challenge{min-height:100vh;padding:var(--spacing-xl) 0;background:linear-gradient(135deg,#43e97b,#38f9d7);animation:fadeIn .4s ease-out;position:relative;overflow-x:hidden}.typing-challenge:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 25% 25%,rgba(255,255,255,.1) 0%,transparent 50%),radial-gradient(circle at 75% 75%,rgba(255,255,255,.1) 0%,transparent 50%);animation:float 18s ease-in-out infinite;pointer-events:none}.typing-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);gap:var(--spacing-md);background:#ffffff26;padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:slideInRight .5s ease-out}.typing-title{font-size:1.75rem;font-weight:800;color:#fff;margin:0;flex:1;text-align:center;text-shadow:0 2px 10px rgba(0,0,0,.2);letter-spacing:.5px}.typing-stats-mini{display:flex;gap:var(--spacing-sm)}.typing-progress{margin-bottom:var(--spacing-2xl);background:#ffffff26;padding:var(--spacing-lg);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:slideInLeft .5s ease-out .1s both}.typing-accuracy{text-align:center;margin-bottom:var(--spacing-2xl);color:#fff;font-size:1.25rem;background:#ffffff26;padding:var(--spacing-lg);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:scaleIn .5s ease-out .2s both}.typing-question-card{margin-bottom:var(--spacing-2xl);animation:cardFlipIn .6s cubic-bezier(.34,1.56,.64,1) both;box-shadow:0 20px 60px #0000004d,0 0 0 1px #ffffff1a inset}.typing-question-content{text-align:center;padding:var(--spacing-3xl) var(--spacing-2xl)}.typing-question-label{font-size:1rem;font-weight:700;text-transform:uppercase;letter-spacing:2px;margin-bottom:var(--spacing-xl);opacity:.95;text-shadow:0 2px 4px rgba(0,0,0,.2)}.typing-question{font-size:3.5rem;font-weight:900;margin-bottom:var(--spacing-lg);word-wrap:break-word;line-height:1.2;text-shadow:0 4px 12px rgba(0,0,0,.3)}.typing-pronunciation{font-size:1.25rem;font-style:italic;opacity:.9;margin-bottom:var(--spacing-xl);text-shadow:0 2px 4px rgba(0,0,0,.2)}.typing-meta{display:flex;gap:var(--spacing-md);justify-content:center;margin-top:var(--spacing-xl)}.typing-input-container{margin-bottom:var(--spacing-2xl);animation:slideInRight .5s ease-out .3s both}.typing-input{width:100%;padding:var(--spacing-xl) var(--spacing-2xl);font-size:1.5rem;font-weight:600;font-family:var(--font-primary);border:3px solid rgba(255,255,255,.3);border-radius:var(--radius-xl);background:#fffffff2;color:var(--color-text);text-align:center;transition:all var(--transition-normal);box-shadow:0 8px 24px #0000001a}.typing-input:focus{outline:none;border-color:#43e97bcc;box-shadow:0 8px 32px #43e97b4d,0 0 0 4px #43e97b1a;transform:translateY(-2px)}.typing-input::placeholder{color:#0006;font-weight:400}.typing-input:disabled{opacity:.8;cursor:not-allowed}.input-correct{background:linear-gradient(135deg,#10b981,#34d399);color:#fff;border-color:#10b981;animation:correctPulse .6s ease-out}.input-correct::placeholder{color:#ffffffb3}.input-wrong{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;border-color:#ef4444;animation:shake .5s ease-out}.input-wrong::placeholder{color:#ffffffb3}@keyframes correctPulse{0%,to{transform:scale(1)}50%{transform:scale(1.02)}}.typing-feedback{margin-top:var(--spacing-lg);padding:var(--spacing-lg) var(--spacing-xl);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;gap:var(--spacing-md);font-size:1.125rem;font-weight:600;animation:slideInRight .4s ease-out}.feedback-correct{background:#10b98133;color:#065f46;border:2px solid #10b981}.feedback-wrong{background:#ef444433;color:#7f1d1d;border:2px solid #ef4444}.feedback-icon{font-size:1.5rem;animation:iconPop .4s cubic-bezier(.34,1.56,.64,1)}.feedback-text strong{font-weight:800;text-decoration:underline}.typing-hint{margin-top:var(--spacing-lg);padding:var(--spacing-md) var(--spacing-lg);background:#3b82f633;color:#1e3a8a;border:2px solid #3b82f6;border-radius:var(--radius-lg);font-size:1rem;font-weight:600;text-align:center;animation:slideInLeft .4s ease-out}.typing-actions{display:flex;gap:var(--spacing-lg);justify-content:center;margin-bottom:var(--spacing-2xl);animation:slideInLeft .5s ease-out .4s both;flex-wrap:wrap}.typing-waiting{text-align:center;color:#fff;font-size:1.25rem;font-weight:600;padding:var(--spacing-lg);background:#ffffff26;border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);animation:pulse 1.5s ease-in-out infinite}.typing-score{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-xl);background:#ffffff26;padding:var(--spacing-2xl);border-radius:var(--radius-2xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:scaleIn .5s ease-out .5s both}@media (max-width: 768px){.typing-challenge{padding:var(--spacing-md) 0}.typing-header{flex-wrap:wrap;padding:var(--spacing-md)}.typing-title{width:100%;order:-1;margin-bottom:var(--spacing-sm);font-size:1.5rem}.typing-question{font-size:2.5rem}.typing-input{font-size:1.25rem;padding:var(--spacing-lg)}.typing-actions{flex-direction:column}.typing-actions button{width:100%}.typing-score{grid-template-columns:repeat(3,1fr);gap:var(--spacing-md);padding:var(--spacing-lg)}.score-item{padding:var(--spacing-md)}.score-icon{font-size:2rem}.score-value{font-size:1.75rem}.score-label{font-size:.75rem}}.listening{min-height:100vh;padding:var(--spacing-xl) 0;background:linear-gradient(135deg,#fa709a,#fee140);animation:fadeIn .4s ease-out;position:relative;overflow-x:hidden}.listening:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 35% 30%,rgba(255,255,255,.1) 0%,transparent 50%),radial-gradient(circle at 65% 70%,rgba(255,255,255,.1) 0%,transparent 50%);animation:float 16s ease-in-out infinite;pointer-events:none}.listening-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);gap:var(--spacing-md);background:#ffffff26;padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:slideInRight .5s ease-out}.listening-title{font-size:1.75rem;font-weight:800;color:#fff;margin:0;flex:1;text-align:center;text-shadow:0 2px 10px rgba(0,0,0,.2);letter-spacing:.5px}.listening-stats-mini{display:flex;gap:var(--spacing-sm)}.listening-progress{margin-bottom:var(--spacing-2xl);background:#ffffff26;padding:var(--spacing-lg);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:slideInLeft .5s ease-out .1s both}.listening-accuracy{text-align:center;margin-bottom:var(--spacing-2xl);color:#fff;font-size:1.25rem;background:#ffffff26;padding:var(--spacing-lg);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:scaleIn .5s ease-out .2s both}.accuracy-value.good{color:#6ee7b7;text-shadow:0 0 20px rgba(110,231,183,.8)}.accuracy-value.needs-work{color:#fde047;text-shadow:0 0 20px rgba(253,224,71,.8)}.listening-question-card{margin-bottom:var(--spacing-3xl);animation:cardFlipIn .6s cubic-bezier(.34,1.56,.64,1) both;box-shadow:0 20px 60px #0000004d,0 0 0 1px #ffffff1a inset}.listening-question-content{text-align:center;padding:var(--spacing-3xl) var(--spacing-2xl)}.listening-question-label{font-size:1rem;font-weight:700;text-transform:uppercase;letter-spacing:2px;margin-bottom:var(--spacing-2xl);opacity:.95;text-shadow:0 2px 4px rgba(0,0,0,.2)}.listening-audio-control{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-lg);margin:var(--spacing-2xl) 0}.play-button{width:120px;height:120px;border-radius:50%;background:linear-gradient(135deg,#fa709a,#fe8c8c);border:4px solid white;color:#fff;font-size:3rem;cursor:pointer;transition:all var(--transition-normal);box-shadow:0 8px 24px #fa709a66,0 0 0 8px #ffffff1a;animation:pulse 2s ease-in-out infinite}.play-button:hover:not(:disabled){transform:scale(1.1);box-shadow:0 12px 32px #fa709a99,0 0 0 12px #ffffff26}.play-button:active:not(:disabled){transform:scale(1.05)}.play-button:disabled{opacity:.7;cursor:not-allowed}.play-button.playing{animation:playingPulse .8s ease-in-out infinite}@keyframes playingPulse{0%,to{transform:scale(1);box-shadow:0 8px 24px #fa709a66,0 0 0 8px #ffffff1a}50%{transform:scale(1.15);box-shadow:0 12px 32px #fa709acc,0 0 0 16px #fff3}}.audio-instruction{font-size:1.125rem;font-weight:600;color:#000000b3;text-shadow:0 2px 4px rgba(255,255,255,.5)}.listening-word-reveal{margin:var(--spacing-2xl) 0;padding:var(--spacing-xl);background:#fff3;border-radius:var(--radius-lg);animation:slideInRight .4s ease-out}.listening-question{font-size:3rem;font-weight:900;margin-bottom:var(--spacing-md);word-wrap:break-word;line-height:1.2;text-shadow:0 4px 12px rgba(0,0,0,.3)}.listening-pronunciation{font-size:1.25rem;font-style:italic;opacity:.9;text-shadow:0 2px 4px rgba(0,0,0,.2)}.listening-meta{display:flex;gap:var(--spacing-md);justify-content:center;margin-top:var(--spacing-xl)}.listening-choices{display:grid;grid-template-columns:1fr;gap:var(--spacing-lg);margin-bottom:var(--spacing-3xl);animation:slideInRight .5s ease-out .3s both}.choice-button{display:flex;align-items:center;gap:var(--spacing-lg);padding:var(--spacing-xl) var(--spacing-2xl);background:#fffffff2;border:3px solid transparent;border-radius:var(--radius-xl);font-size:1.25rem;font-weight:600;color:var(--color-text);cursor:pointer;transition:all var(--transition-normal);box-shadow:0 4px 12px #0000001a;position:relative;overflow:hidden}.choice-button:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,transparent 0%,rgba(250,112,154,.1) 50%,transparent 100%);transform:translate(-100%);transition:transform .6s}.choice-button:hover:not(:disabled):before{transform:translate(100%)}.choice-button:hover:not(:disabled){transform:translateY(-4px);box-shadow:0 8px 24px #0003;border-color:#fa709a80}.choice-button:active:not(:disabled){transform:translateY(-2px)}.choice-button:disabled{cursor:not-allowed}.choice-letter{display:flex;align-items:center;justify-content:center;width:48px;height:48px;background:linear-gradient(135deg,#fa709a,#fe8c8c);color:#fff;border-radius:var(--radius-lg);font-size:1.5rem;font-weight:800;flex-shrink:0;box-shadow:0 4px 8px #0003}.choice-text{flex:1;text-align:left;position:relative;z-index:1}.choice-icon{font-size:2rem;flex-shrink:0;animation:iconPop .4s cubic-bezier(.34,1.56,.64,1)}@keyframes iconPop{0%{transform:scale(0)}to{transform:scale(1)}}.choice-correct{background:linear-gradient(135deg,#10b981,#34d399);color:#fff;border-color:#10b981;animation:correctPulse .6s ease-out;box-shadow:0 8px 24px #10b98166}@keyframes correctPulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}.choice-wrong{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;border-color:#ef4444;animation:shake .5s ease-out;box-shadow:0 8px 24px #ef444466}.choice-faded{opacity:.4;transform:scale(.98)}.listening-score{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-xl);background:#ffffff26;padding:var(--spacing-2xl);border-radius:var(--radius-2xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:slideInLeft .5s ease-out .4s both}.score-item{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);color:#fff;padding:var(--spacing-lg);border-radius:var(--radius-xl);background:#ffffff1a;transition:all var(--transition-normal)}.score-item:hover{transform:translateY(-4px);background:#ffffff26}.score-icon{font-size:2.5rem;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3))}.score-value{font-size:2.5rem;font-weight:900;text-shadow:0 2px 8px rgba(0,0,0,.3)}.score-label{font-size:.875rem;opacity:.9;text-transform:uppercase;letter-spacing:1px;font-weight:600}@media (max-width: 768px){.listening{padding:var(--spacing-md) 0}.listening-header{flex-wrap:wrap;padding:var(--spacing-md)}.listening-title{width:100%;order:-1;margin-bottom:var(--spacing-sm);font-size:1.5rem}.play-button{width:100px;height:100px;font-size:2.5rem}.listening-question{font-size:2.5rem}.listening-score{grid-template-columns:repeat(3,1fr);gap:var(--spacing-md);padding:var(--spacing-lg)}.score-item{padding:var(--spacing-md)}.score-icon{font-size:2rem}.score-value{font-size:1.75rem}.score-label{font-size:.75rem}.choice-button{padding:var(--spacing-lg);font-size:1rem}.choice-letter{width:40px;height:40px;font-size:1.25rem}}.matching-pairs{min-height:100vh;padding:var(--spacing-xl) 0;background:linear-gradient(135deg,#a8edea,#fed6e3);animation:fadeIn .4s ease-out;position:relative;overflow-x:hidden}.matching-pairs:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 40% 40%,rgba(255,255,255,.1) 0%,transparent 50%),radial-gradient(circle at 60% 60%,rgba(255,255,255,.1) 0%,transparent 50%);animation:float 20s ease-in-out infinite;pointer-events:none}.matching-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);gap:var(--spacing-md);background:#ffffff26;padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:slideInRight .5s ease-out}.matching-title{font-size:1.75rem;font-weight:800;color:#fff;margin:0;flex:1;text-align:center;text-shadow:0 2px 10px rgba(0,0,0,.2);letter-spacing:.5px}.matching-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-lg);margin-bottom:var(--spacing-3xl);animation:slideInLeft .5s ease-out .1s both}.stat-item{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);background:#ffffff26;padding:var(--spacing-xl);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;color:#fff;transition:all var(--transition-normal)}.stat-item:hover{transform:translateY(-4px);background:#fff3}.stat-icon{font-size:2.5rem;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3))}.stat-value{font-size:2rem;font-weight:900;text-shadow:0 2px 8px rgba(0,0,0,.3)}.stat-label{font-size:.875rem;opacity:.9;text-transform:uppercase;letter-spacing:1px;font-weight:600}.matching-board{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--spacing-lg);margin-bottom:var(--spacing-3xl);animation:scaleIn .5s ease-out .2s both}.matching-card{aspect-ratio:1;perspective:1000px;cursor:pointer;animation:cardSlideIn .5s ease-out both}.matching-card:nth-child(1){animation-delay:.1s}.matching-card:nth-child(2){animation-delay:.15s}.matching-card:nth-child(3){animation-delay:.2s}.matching-card:nth-child(4){animation-delay:.25s}.matching-card:nth-child(5){animation-delay:.3s}.matching-card:nth-child(6){animation-delay:.35s}.matching-card:nth-child(7){animation-delay:.4s}.matching-card:nth-child(8){animation-delay:.45s}.matching-card:nth-child(9){animation-delay:.5s}.matching-card:nth-child(10){animation-delay:.55s}.matching-card:nth-child(11){animation-delay:.6s}.matching-card:nth-child(12){animation-delay:.65s}@keyframes cardSlideIn{0%{opacity:0;transform:translateY(20px) scale(.8)}to{opacity:1;transform:translateY(0) scale(1)}}.card-inner{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}.matching-card.flipped .card-inner{transform:rotateY(180deg)}.card-front,.card-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:var(--radius-xl);display:flex;align-items:center;justify-content:center;box-shadow:0 8px 24px #00000026;transition:all var(--transition-normal)}.card-front{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.matching-card:hover:not(.flipped):not(.matched) .card-front{transform:scale(1.05);box-shadow:0 12px 32px #00000040}.card-icon{font-size:3rem;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3))}.card-back{transform:rotateY(180deg);padding:var(--spacing-md)}.card-learning{background:linear-gradient(135deg,#f093fb,#f5576c);color:#fff}.card-known{background:linear-gradient(135deg,#4facfe,#00f2fe);color:#fff}.card-text{font-size:1.25rem;font-weight:700;text-align:center;word-wrap:break-word;text-shadow:0 2px 8px rgba(0,0,0,.3)}.matching-card.matched{cursor:default;animation:matchPulse .6s ease-out}.matching-card.matched .card-back{background:linear-gradient(135deg,#10b981,#34d399);box-shadow:0 8px 24px #10b98166}@keyframes matchPulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.completion-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .3s ease-out;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.completion-card{max-width:500px;width:90%;animation:scaleIn .5s cubic-bezier(.34,1.56,.64,1)}.completion-content{padding:var(--spacing-3xl);text-align:center}.completion-title{font-size:2.5rem;font-weight:900;margin-bottom:var(--spacing-lg);background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.completion-message{font-size:1.25rem;margin-bottom:var(--spacing-3xl);opacity:.8}.completion-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-xl);margin-bottom:var(--spacing-3xl)}.completion-stat{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-xl);background:var(--gradient-primary);border-radius:var(--radius-xl);color:#fff}.completion-stat-icon{font-size:2.5rem;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3))}.completion-stat-value{font-size:2rem;font-weight:900;text-shadow:0 2px 8px rgba(0,0,0,.3)}.completion-stat-label{font-size:.875rem;opacity:.9;text-transform:uppercase;letter-spacing:1px;font-weight:600}.completion-actions{display:flex;gap:var(--spacing-lg);justify-content:center}@media (max-width: 768px){.matching-pairs{padding:var(--spacing-md) 0}.matching-header{flex-wrap:wrap;padding:var(--spacing-md)}.matching-title{width:100%;order:-1;margin-bottom:var(--spacing-sm);font-size:1.5rem}.matching-stats{gap:var(--spacing-md)}.stat-item{padding:var(--spacing-md)}.stat-icon{font-size:2rem}.stat-value{font-size:1.5rem}.matching-board{grid-template-columns:repeat(3,1fr);gap:var(--spacing-md)}.card-text{font-size:1rem}.card-icon{font-size:2rem}.completion-content{padding:var(--spacing-2xl)}.completion-title{font-size:2rem}.completion-actions{flex-direction:column}.completion-actions button{width:100%}}@media (max-width: 480px){.matching-board{grid-template-columns:repeat(2,1fr)}}.speed-round{min-height:100vh;padding:var(--spacing-xl) 0;background:linear-gradient(135deg,#f093fb,#f5576c);animation:fadeIn .4s ease-out;position:relative;overflow-x:hidden}.speed-round:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 30% 40%,rgba(255,255,255,.15) 0%,transparent 50%),radial-gradient(circle at 70% 60%,rgba(255,255,255,.15) 0%,transparent 50%);animation:float 15s ease-in-out infinite;pointer-events:none}.speed-intro-card{animation:scaleIn .5s cubic-bezier(.34,1.56,.64,1)}.speed-intro{padding:var(--spacing-3xl);text-align:center}.speed-intro-title{font-size:3rem;font-weight:900;margin-bottom:var(--spacing-lg);background:linear-gradient(135deg,#f093fb,#f5576c);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.speed-intro-description{font-size:1.25rem;margin-bottom:var(--spacing-3xl);opacity:.8}.speed-intro-rules{display:flex;flex-direction:column;gap:var(--spacing-xl);margin-bottom:var(--spacing-3xl);text-align:left}.rule-item{display:flex;gap:var(--spacing-lg);align-items:flex-start;padding:var(--spacing-lg);background:var(--gradient-primary);border-radius:var(--radius-lg);color:#fff}.rule-icon{font-size:2rem;flex-shrink:0;filter:drop-shadow(0 2px 4px rgba(0,0,0,.3))}.rule-item strong{display:block;font-size:1.125rem;margin-bottom:var(--spacing-xs)}.rule-item p{margin:0;opacity:.9}.speed-intro-actions{display:flex;gap:var(--spacing-lg);justify-content:center;flex-wrap:wrap}.speed-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);gap:var(--spacing-md);background:#ffffff26;padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 32px #0000001a;animation:slideInRight .5s ease-out}.speed-stats-row{display:flex;gap:var(--spacing-md);align-items:center}.streak-badge{animation:pulse .5s ease-in-out infinite}.speed-timer{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-xl);background:#fffffff2;border-radius:var(--radius-lg);box-shadow:0 4px 12px #00000026;transition:all var(--transition-normal)}.timer-icon{font-size:1.5rem}.timer-value{font-size:1.5rem;font-weight:900;font-family:Courier New,monospace;color:var(--color-text)}.timer-warning{background:linear-gradient(135deg,#ef4444,#dc2626);animation:timerPulse 1s ease-in-out infinite}.timer-warning .timer-value,.timer-warning .timer-icon{color:#fff}@keyframes timerPulse{0%,to{transform:scale(1);box-shadow:0 4px 12px #ef444466}50%{transform:scale(1.05);box-shadow:0 8px 24px #ef444499}}.speed-question-card{margin-bottom:var(--spacing-2xl);animation:cardFlipIn .3s cubic-bezier(.34,1.56,.64,1) both;box-shadow:0 20px 60px #0000004d}.speed-question-content{text-align:center;padding:var(--spacing-3xl) var(--spacing-2xl)}.speed-question{font-size:3rem;font-weight:900;margin-bottom:var(--spacing-md);word-wrap:break-word;line-height:1.2;text-shadow:0 4px 12px rgba(0,0,0,.2)}.speed-pronunciation{font-size:1.125rem;font-style:italic;opacity:.7}.speed-choices{display:grid;grid-template-columns:1fr;gap:var(--spacing-md);margin-bottom:var(--spacing-xl);animation:slideInLeft .3s ease-out .1s both}.speed-choice-button{display:flex;align-items:center;gap:var(--spacing-lg);padding:var(--spacing-lg) var(--spacing-xl);background:#fffffff2;border:3px solid transparent;border-radius:var(--radius-lg);font-size:1.125rem;font-weight:600;color:var(--color-text);cursor:pointer;transition:all .2s;box-shadow:0 4px 12px #0000001a}.speed-choice-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 16px #00000026;border-color:#f093fb80}.speed-choice-button:active:not(:disabled){transform:translateY(0)}.speed-choice-button:disabled{cursor:not-allowed;opacity:.6}.choice-letter{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:linear-gradient(135deg,#f093fb,#f5576c);color:#fff;border-radius:var(--radius-md);font-size:1.125rem;font-weight:800;flex-shrink:0;box-shadow:0 2px 6px #0003}.choice-text{flex:1;text-align:left}.choice-correct{background:linear-gradient(135deg,#10b981,#34d399);color:#fff;border-color:#10b981;animation:correctFlash .4s ease-out}.choice-correct .choice-letter{background:#ffffff4d}.choice-wrong{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;border-color:#ef4444;animation:shake .4s ease-out}.choice-wrong .choice-letter{background:#ffffff4d}@keyframes correctFlash{0%,to{transform:scale(1)}50%{transform:scale(1.02)}}.speed-progress-hint{text-align:center;color:#fff;font-size:.875rem;font-weight:600;opacity:.8;text-shadow:0 2px 4px rgba(0,0,0,.3)}.speed-result-card{animation:scaleIn .5s cubic-bezier(.34,1.56,.64,1)}.speed-result{padding:var(--spacing-3xl);text-align:center}.speed-result-title{font-size:3rem;font-weight:900;margin-bottom:var(--spacing-2xl);background:linear-gradient(135deg,#f093fb,#f5576c);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.speed-final-score{margin-bottom:var(--spacing-3xl)}.final-score-value{font-size:5rem;font-weight:900;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1;margin-bottom:var(--spacing-sm)}.final-score-label{font-size:1.25rem;opacity:.7;text-transform:uppercase;letter-spacing:2px;font-weight:700}.speed-result-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-xl);margin-bottom:var(--spacing-3xl)}.result-stat{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-xl);background:var(--gradient-primary);border-radius:var(--radius-xl);color:#fff}.result-stat-icon{font-size:2.5rem;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3))}.result-stat-value{font-size:2.5rem;font-weight:900;text-shadow:0 2px 8px rgba(0,0,0,.3)}.result-stat-label{font-size:.875rem;opacity:.9;text-transform:uppercase;letter-spacing:1px;font-weight:600}.speed-result-actions{display:flex;gap:var(--spacing-lg);justify-content:center;flex-wrap:wrap}@media (max-width: 768px){.speed-round{padding:var(--spacing-md) 0}.speed-intro,.speed-result{padding:var(--spacing-2xl)}.speed-intro-title,.speed-result-title,.speed-question{font-size:2rem}.final-score-value{font-size:4rem}.speed-header{flex-wrap:wrap}.speed-timer{order:-1;width:100%;justify-content:center}.speed-choices{gap:var(--spacing-sm)}.speed-choice-button{padding:var(--spacing-md) var(--spacing-lg);font-size:1rem}.speed-intro-actions,.speed-result-actions{flex-direction:column}.speed-intro-actions button,.speed-result-actions button{width:100%}}.true-false{min-height:100vh;padding:var(--spacing-xl) 0;background:var(--color-bg);animation:fadeIn .4s ease-out}.tf-intro-card{max-width:600px;margin:0 auto}.tf-intro{padding:var(--spacing-2xl);text-align:center}.tf-intro-title{font-size:2.5rem;font-weight:800;color:var(--color-text);margin-bottom:var(--spacing-md)}.tf-intro-description{font-size:1.125rem;color:var(--color-text-light);margin-bottom:var(--spacing-2xl)}.tf-intro-rules{display:flex;flex-direction:column;gap:var(--spacing-lg);margin-bottom:var(--spacing-2xl);text-align:left}.rule-item{display:flex;gap:var(--spacing-md);align-items:flex-start}.rule-icon{font-size:2rem;flex-shrink:0}.rule-item strong{display:block;font-size:1.125rem;margin-bottom:var(--spacing-xs);color:var(--color-text)}.rule-item p{margin:0;color:var(--color-text-light)}.tf-intro-actions{display:flex;gap:var(--spacing-md);justify-content:center;flex-wrap:wrap}.tf-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);gap:var(--spacing-md);background:var(--color-surface);padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-lg);border:1px solid var(--color-border);box-shadow:var(--shadow-sm)}.tf-stats-row{display:flex;gap:var(--spacing-sm);align-items:center}.tf-timer{display:flex;align-items:center;gap:var(--spacing-xs);font-size:1.5rem;font-weight:700;color:var(--color-primary);padding:var(--spacing-xs) var(--spacing-md);background:#6366f11a;border-radius:var(--radius-md)}.tf-timer.timer-warning{color:var(--color-error);background:#ef44441a;animation:pulse 1s ease-in-out infinite}.timer-icon{font-size:1.25rem}.tf-question-count{font-size:1rem;font-weight:600;color:var(--color-text-light)}.tf-question-card{margin-bottom:var(--spacing-2xl);animation:scaleIn .3s ease-out}.tf-question-content{padding:var(--spacing-2xl);text-align:center}.tf-question-label{font-size:1rem;font-weight:600;color:var(--color-text-light);text-transform:uppercase;letter-spacing:.5px;margin-bottom:var(--spacing-xl)}.tf-pair{display:flex;align-items:center;justify-content:center;gap:var(--spacing-2xl);flex-wrap:wrap;margin-bottom:var(--spacing-xl)}.tf-word,.tf-translation{flex:1;min-width:200px}.tf-lang-label{display:block;font-size:.875rem;color:var(--color-text-light);margin-bottom:var(--spacing-sm)}.tf-word-text,.tf-translation-text{font-size:1.75rem;font-weight:700;color:var(--color-text);margin:0;line-height:1.3}.tf-pronunciation{font-size:.875rem;color:var(--color-text-light);margin-top:var(--spacing-xs)}.tf-arrow{font-size:2rem;font-weight:700;color:var(--color-primary)}.tf-feedback{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-md);border-radius:var(--radius-md);font-weight:600;animation:slideInRight .3s ease-out}.tf-feedback.feedback-correct{background:#10b9811a;color:var(--color-success)}.tf-feedback.feedback-wrong{background:#ef44441a;color:var(--color-error)}.feedback-icon{font-size:1.5rem}.tf-buttons{display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-lg);max-width:600px;margin:0 auto}.tf-button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-2xl) var(--spacing-lg);border:3px solid;border-radius:var(--radius-xl);background:var(--color-surface);cursor:pointer;transition:all var(--transition-fast);font-family:var(--font-primary);font-weight:700}.tf-button:hover:not(:disabled){transform:translateY(-4px);box-shadow:var(--shadow-lg)}.tf-button:active:not(:disabled){transform:translateY(-2px)}.tf-button:disabled{opacity:.5;cursor:not-allowed}.tf-button-false{border-color:var(--color-error);color:var(--color-error)}.tf-button-false:hover:not(:disabled){background:#ef44441a}.tf-button-true{border-color:var(--color-success);color:var(--color-success)}.tf-button-true:hover:not(:disabled){background:#10b9811a}.tf-button-icon{font-size:3rem}.tf-button-text{font-size:1.5rem}.tf-result-card{max-width:600px;margin:0 auto}.tf-result{padding:var(--spacing-2xl);text-align:center}.tf-result-title{font-size:2.5rem;font-weight:800;color:var(--color-text);margin-bottom:var(--spacing-2xl)}.tf-final-score{margin-bottom:var(--spacing-2xl)}.final-score-value{font-size:4rem;font-weight:800;color:var(--color-primary);line-height:1}.final-score-label{font-size:1.125rem;color:var(--color-text-light);margin-top:var(--spacing-sm)}.tf-result-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-lg);margin-bottom:var(--spacing-2xl)}.result-stat{padding:var(--spacing-lg);background:var(--color-surface);border-radius:var(--radius-lg);border:1px solid var(--color-border)}.result-stat-icon{font-size:2rem;margin-bottom:var(--spacing-sm)}.result-stat-value{font-size:1.75rem;font-weight:700;color:var(--color-primary);margin-bottom:var(--spacing-xs)}.result-stat-label{font-size:.875rem;color:var(--color-text-light)}.tf-result-actions{display:flex;gap:var(--spacing-md);justify-content:center;flex-wrap:wrap}@media (max-width: 768px){.tf-intro-title,.tf-result-title{font-size:2rem}.tf-pair{flex-direction:column;gap:var(--spacing-lg)}.tf-arrow{transform:rotate(90deg)}.tf-buttons{gap:var(--spacing-md)}.tf-button{padding:var(--spacing-xl) var(--spacing-md)}.tf-button-icon{font-size:2.5rem}.tf-button-text{font-size:1.25rem}.tf-result-stats{grid-template-columns:1fr}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}.stats{min-height:100vh;padding:var(--spacing-xl) 0;background:linear-gradient(135deg,#667eea,#764ba2);animation:fadeIn .4s ease-out}.stats-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-2xl);gap:var(--spacing-md)}.stats-title{font-size:2rem;font-weight:900;color:#fff;margin:0;text-align:center;flex:1;text-shadow:0 4px 12px rgba(0,0,0,.3)}.stats-overview{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-lg);margin-bottom:var(--spacing-3xl);animation:slideInUp .5s ease-out}.stat-card{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-2xl);text-align:center;transition:all var(--transition-normal)}.stat-card:hover{transform:translateY(-4px)}.stat-card-icon{font-size:3rem;margin-bottom:var(--spacing-md);filter:drop-shadow(0 4px 8px rgba(0,0,0,.1))}.stat-card-value{font-size:2.5rem;font-weight:900;color:var(--primary);margin-bottom:var(--spacing-sm)}.stat-card-label{font-size:.875rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--text-secondary);margin-bottom:var(--spacing-xs)}.stat-card-detail{font-size:.875rem;color:var(--text-tertiary)}.stats-section{margin-bottom:var(--spacing-2xl);animation:slideInUp .5s ease-out}.stats-section .section-title{font-size:1.5rem;font-weight:800;margin-bottom:var(--spacing-xl);color:var(--text)}.mode-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--spacing-lg)}.mode-stat-item{padding:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--radius-lg);transition:all var(--transition-normal)}.mode-stat-item:hover{background:var(--bg-tertiary);transform:translateY(-2px)}.mode-stat-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-md)}.mode-stat-name{font-size:1rem;font-weight:700;color:var(--text)}.mode-stat-details{display:flex;gap:var(--spacing-lg);font-size:.875rem;color:var(--text-secondary);font-weight:600}.category-progress-list{display:flex;flex-direction:column;gap:var(--spacing-lg)}.category-progress-item{padding:var(--spacing-md);background:var(--bg-secondary);border-radius:var(--radius-lg);transition:all var(--transition-normal)}.category-progress-item:hover{background:var(--bg-tertiary)}.category-progress-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-sm)}.category-progress-name{font-size:1rem;font-weight:700;color:var(--text)}.category-progress-fraction{font-size:.875rem;font-weight:600;color:var(--text-secondary)}.category-progress-bar{width:100%;height:8px;background:var(--bg-tertiary);border-radius:var(--radius-full);overflow:hidden;margin-bottom:var(--spacing-xs)}.category-progress-fill{height:100%;background:var(--gradient-primary);border-radius:var(--radius-full);transition:width .6s ease-out}.category-progress-percentage{text-align:right;font-size:.75rem;font-weight:700;color:var(--primary)}.session-history-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.session-history-item{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--radius-lg);transition:all var(--transition-normal)}.session-history-item:hover{background:var(--bg-tertiary);transform:translate(4px)}.session-info{display:flex;flex-direction:column;gap:var(--spacing-xs)}.session-mode{font-size:1rem;font-weight:700;color:var(--text)}.session-date{font-size:.875rem;color:var(--text-secondary)}.session-stats{display:flex;gap:var(--spacing-lg);align-items:center}.session-detail{font-size:.875rem;font-weight:600;color:var(--text-secondary)}.stats-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-4xl);text-align:center}.stats-empty-icon{font-size:5rem;margin-bottom:var(--spacing-xl);opacity:.5}.stats-empty-title{font-size:1.5rem;font-weight:800;margin-bottom:var(--spacing-md);color:var(--text)}.stats-empty-text{font-size:1rem;color:var(--text-secondary);margin-bottom:var(--spacing-2xl);max-width:400px}@media (max-width: 768px){.stats{padding:var(--spacing-md) 0}.stats-title{font-size:1.5rem}.stats-overview{grid-template-columns:repeat(2,1fr);gap:var(--spacing-md)}.stat-card{padding:var(--spacing-lg)}.stat-card-icon{font-size:2rem}.stat-card-value{font-size:1.75rem}.mode-stats-grid{grid-template-columns:1fr}.session-history-item{flex-direction:column;align-items:flex-start;gap:var(--spacing-md)}.session-stats{width:100%;justify-content:space-between}}@media (max-width: 480px){.stats-overview{grid-template-columns:1fr}}.achievements{min-height:100vh;padding:var(--spacing-xl) 0;background:linear-gradient(135deg,#f093fb,#f5576c);animation:fadeIn .4s ease-out}.achievements-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-2xl);gap:var(--spacing-md)}.achievements-title{font-size:2rem;font-weight:900;color:#fff;margin:0;text-align:center;flex:1;text-shadow:0 4px 12px rgba(0,0,0,.3)}.achievements-overview{margin-bottom:var(--spacing-3xl);padding:var(--spacing-2xl);animation:slideInUp .5s ease-out}.achievements-progress{display:flex;align-items:center;justify-content:center;gap:var(--spacing-3xl)}.progress-circle{position:relative;width:180px;height:180px}.progress-ring{width:100%;height:100%;transform:rotate(-90deg)}.progress-ring-background{fill:none;stroke:var(--bg-tertiary);stroke-width:8}.progress-ring-progress{fill:none;stroke:url(#progressGradient);stroke-width:8;stroke-linecap:round;transition:stroke-dasharray .6s ease-out}.progress-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center}.progress-percentage{font-size:2.5rem;font-weight:900;color:var(--primary);line-height:1;margin-bottom:var(--spacing-xs)}.progress-label{font-size:.875rem;color:var(--text-secondary);font-weight:600;text-transform:uppercase;letter-spacing:1px}.progress-stats{display:flex;gap:var(--spacing-3xl)}.progress-stat{text-align:center}.progress-stat-value{font-size:3rem;font-weight:900;color:var(--text);line-height:1;margin-bottom:var(--spacing-sm)}.progress-stat-label{font-size:.875rem;color:var(--text-secondary);font-weight:600;text-transform:uppercase;letter-spacing:1px}.achievement-category{margin-bottom:var(--spacing-2xl);padding:var(--spacing-2xl);animation:slideInUp .5s ease-out}.category-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl)}.category-title{font-size:1.5rem;font-weight:800;color:var(--text);margin:0}.achievements-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--spacing-lg)}.achievement-card{position:relative;display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--radius-xl);transition:all var(--transition-normal);overflow:hidden}.achievement-card:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,#667eea1a,#764ba21a);opacity:0;transition:opacity var(--transition-normal)}.achievement-card.unlocked{cursor:pointer}.achievement-card.unlocked:hover{transform:translateY(-4px);box-shadow:0 12px 24px #00000026}.achievement-card.unlocked:before{opacity:1}.achievement-card.locked{opacity:.5}.achievement-card.locked .achievement-icon,.achievement-card.locked .achievement-content{filter:grayscale(100%)}.achievement-icon{font-size:3rem;flex-shrink:0;filter:drop-shadow(0 4px 8px rgba(0,0,0,.1));transition:all var(--transition-normal)}.achievement-card.unlocked:hover .achievement-icon{transform:scale(1.1) rotate(5deg)}.achievement-content{flex:1}.achievement-title{font-size:1.125rem;font-weight:700;color:var(--text);margin:0 0 var(--spacing-xs) 0}.achievement-description{font-size:.875rem;color:var(--text-secondary);margin:0;line-height:1.4}.achievement-badge{flex-shrink:0}.achievement-lock{flex-shrink:0;font-size:1.5rem;opacity:.3}.achievements-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-4xl);text-align:center;margin-top:var(--spacing-2xl)}.achievements-empty-icon{font-size:5rem;margin-bottom:var(--spacing-xl);opacity:.5}.achievements-empty-title{font-size:1.5rem;font-weight:800;margin-bottom:var(--spacing-md);color:var(--text)}.achievements-empty-text{font-size:1rem;color:var(--text-secondary);margin-bottom:var(--spacing-2xl);max-width:400px}@media (max-width: 768px){.achievements{padding:var(--spacing-md) 0}.achievements-title{font-size:1.5rem}.achievements-progress{flex-direction:column;gap:var(--spacing-2xl)}.progress-circle{width:150px;height:150px}.progress-percentage,.progress-stat-value{font-size:2rem}.achievements-grid{grid-template-columns:1fr}.category-title{font-size:1.25rem}}@media (max-width: 480px){.achievement-card{flex-direction:column;text-align:center}.achievement-badge,.achievement-lock{position:absolute;top:var(--spacing-md);right:var(--spacing-md)}}.app{min-height:100vh;display:flex;flex-direction:column}.page-enter{opacity:0;transform:translateY(20px)}.page-enter-active{opacity:1;transform:translateY(0);transition:all .3s ease-out}.page-exit{opacity:1}.page-exit-active{opacity:0;transition:all .2s ease-in}:root{--color-primary: #6366f1;--color-primary-dark: #4f46e5;--color-primary-light: #818cf8;--color-secondary: #f59e0b;--color-secondary-dark: #d97706;--color-secondary-light: #fbbf24;--color-success: #10b981;--color-error: #ef4444;--color-warning: #f59e0b;--color-info: #3b82f6;--color-purple: #a855f7;--color-pink: #ec4899;--color-teal: #14b8a6;--color-bg: #f8fafc;--color-bg-alt: #ffffff;--color-surface: #ffffff;--color-text: #1e293b;--color-text-light: #64748b;--color-border: #e2e8f0;--primary: #6366f1;--secondary: #f59e0b;--success: #10b981;--error: #ef4444;--warning: #f59e0b;--bg: #f8fafc;--bg-secondary: #ffffff;--bg-tertiary: #f1f5f9;--text: #1e293b;--text-secondary: #64748b;--text-tertiary: #94a3b8;--gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--gradient-success: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);--gradient-ocean: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);--gradient-sunset: linear-gradient(135deg, #fa709a 0%, #fee140 100%);--gradient-forest: linear-gradient(135deg, #0ba360 0%, #3cba92 100%);--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--spacing-3xl: 4rem;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-2xl: 1.5rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1);--shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / .25);--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .3s cubic-bezier(.4, 0, .2, 1);--transition-slow: .5s cubic-bezier(.4, 0, .2, 1);--font-primary: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", "Android Emoji";--font-display: "Nunito", "Poppins", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", "Android Emoji"}[data-theme=dark]{--color-primary: #818cf8;--color-primary-dark: #6366f1;--color-primary-light: #a5b4fc;--color-success: #34d399;--color-error: #f87171;--color-warning: #fbbf24;--color-info: #60a5fa;--color-bg: #0f172a;--color-bg-alt: #1e293b;--color-surface: #1e293b;--color-text: #f1f5f9;--color-text-light: #cbd5e1;--color-border: #334155;--bg: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--text: #f1f5f9;--text-secondary: #cbd5e1;--text-tertiary: #94a3b8;--primary: #818cf8;--secondary: #fbbf24;--success: #34d399;--error: #f87171;--warning: #fbbf24;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .3);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .4);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .5);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .6);--shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / .7)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;font-family:var(--font-primary);font-size:1rem;line-height:1.6;color:var(--color-text);background:var(--color-bg);min-height:100vh}#root{min-height:100vh;display:flex;flex-direction:column}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:700;line-height:1.2;margin-bottom:var(--spacing-md);color:var(--color-text)}h1{font-size:2.5rem}h2{font-size:2rem}h3{font-size:1.75rem}h4{font-size:1.5rem}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-bottom:var(--spacing-md)}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}.fw-normal{font-weight:400}.fw-medium{font-weight:500}.fw-semibold{font-weight:600}.fw-bold{font-weight:700}.text-muted{color:var(--color-text-light)}.text-primary{color:var(--color-primary)}.text-success{color:var(--color-success)}.text-error{color:var(--color-error)}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes wiggle{0%,to{transform:rotate(0)}25%{transform:rotate(-3deg)}75%{transform:rotate(3deg)}}html{scroll-behavior:smooth}::selection{background-color:var(--color-primary-light);color:#fff}:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}input[type=number]::-webkit-inner-spin-button,input[type=number]::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:var(--color-bg)}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-text-light)}@media (max-width: 768px){html{font-size:14px}h1{font-size:2rem}h2{font-size:1.75rem}h3{font-size:1.5rem}}