:root{--bg-primary:#0f0f1a;--bg-secondary:#1a1a2e;--bg-card:#16213e;--bg-card-hover:#1e2a4a;--accent:#6c63ff;--accent-hover:#5a52e0;--accent-light:#6c63ff26;--text-primary:#e8e8f0;--text-secondary:#9999b3;--text-muted:#6666a0;--border:#2a2a4a;--border-light:#333360;--success:#4ade80;--error:#f87171;--warning:#fbbf24;--radius:12px;--radius-sm:8px;--shadow:0 4px 24px #0006;--transition:0.2s ease}*{box-sizing:border-box;margin:0;padding:0}body{background:#0f0f1a;background:var(--bg-primary);color:#e8e8f0;color:var(--text-primary);font-family:Nunito,-apple-system,sans-serif;line-height:1.6;min-height:100vh}button{cursor:pointer;transition:all .2s ease;transition:all var(--transition)}button,input,textarea{border:none;font-family:inherit;outline:none}a{color:inherit;text-decoration:none}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:#1a1a2e;background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:#333360;background:var(--border-light);border-radius:3px}.btn-primary{background:#6c63ff;background:var(--accent);border-radius:8px;border-radius:var(--radius-sm);color:#fff;font-size:14px;font-weight:600;padding:10px 20px}.btn-primary:hover{background:#5a52e0;background:var(--accent-hover);transform:translateY(-1px)}.btn-primary:disabled{cursor:not-allowed;opacity:.5;transform:none}.btn-secondary{background:#0000;border:1px solid #2a2a4a;border:1px solid var(--border);border-radius:8px;border-radius:var(--radius-sm);color:#9999b3;color:var(--text-secondary);font-size:14px;font-weight:500;padding:10px 20px}.btn-secondary:hover{border-color:#6c63ff;border-color:var(--accent);color:#6c63ff;color:var(--accent)}.card{background:#16213e;background:var(--bg-card);border:1px solid #2a2a4a;border:1px solid var(--border);border-radius:12px;border-radius:var(--radius);padding:24px}.modal-overlay{align-items:center;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#000000b3;display:flex;inset:0;justify-content:center;padding:20px;position:fixed;z-index:1000}.modal{animation:slideUp .3s ease;background:#16213e;background:var(--bg-card);border:1px solid #2a2a4a;border:1px solid var(--border);border-radius:12px;border-radius:var(--radius);max-width:440px;padding:32px;width:100%}.form-group{margin-bottom:16px}.form-group label{color:#9999b3;color:var(--text-secondary);display:block;font-size:13px;margin-bottom:6px}.form-group input{background:#1a1a2e;background:var(--bg-secondary);border:1px solid #2a2a4a;border:1px solid var(--border);border-radius:8px;border-radius:var(--radius-sm);color:#e8e8f0;color:var(--text-primary);font-size:14px;padding:12px 14px;transition:border-color .2s ease;transition:border-color var(--transition);width:100%}.form-group input:focus{border-color:#6c63ff;border-color:var(--accent)}.form-error{color:#f87171;color:var(--error);font-size:13px;margin-top:8px}.header{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#0f0f1ae6;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}.header-inner{height:60px;justify-content:space-between;margin:0 auto;max-width:1200px;padding:0 24px}.header-inner,.logo{align-items:center;display:flex}.logo{flex-shrink:0;gap:8px}.logo-icon{align-items:center;display:flex}.logo-text{color:var(--text-primary);font-size:18px;font-weight:700}.logo-badge{background:var(--accent);border-radius:4px;color:#fff;font-size:10px;font-weight:700;padding:2px 6px}.desktop-nav{align-items:center;display:flex;gap:12px}.user-name{color:var(--text-secondary);font-size:14px}.sub-badge{background:linear-gradient(135deg,#fbbf24,#f59e0b);border-radius:20px;color:#1a1a00;font-size:12px;font-weight:700;padding:2px 8px}.burger-btn{align-items:center;background:#0000;border:none;border-radius:var(--radius-sm);cursor:pointer;display:none;flex-direction:column;gap:5px;height:36px;justify-content:center;padding:4px;transition:background var(--transition);width:36px}.burger-btn:hover{background:var(--bg-card)}.burger-btn span{background:var(--text-primary);border-radius:2px;display:block;height:2px;transform-origin:center;transition:all .3s ease;width:22px}.burger-btn.open span:first-child{transform:translateY(7px) rotate(45deg)}.burger-btn.open span:nth-child(2){opacity:0;transform:scaleX(0)}.burger-btn.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}.mobile-menu{animation:slideDown .2s ease;background:var(--bg-card);border-bottom:1px solid var(--border);border-top:1px solid var(--border);display:flex;flex-direction:column;gap:4px;padding:12px 16px}@keyframes slideDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.mobile-menu-user{align-items:center;display:flex;font-size:22px;gap:12px;padding:10px 8px}.mobile-menu-name{color:var(--text-primary);font-size:15px;font-weight:600}.mobile-menu-email{color:var(--text-muted);font-size:12px;margin-top:2px}.mobile-menu-divider{background:var(--border);height:1px;margin:6px 0}.mobile-menu-item{align-items:center;background:#0000;border-radius:var(--radius-sm);color:var(--text-primary);display:flex;font-size:15px;font-weight:500;padding:12px;text-align:left;transition:background var(--transition);width:100%}.mobile-menu-item:hover{background:var(--bg-secondary)}.mobile-menu-item.accent{color:var(--accent)}.mobile-menu-item.accent:hover{background:var(--accent-light)}.mobile-menu-item.danger{color:var(--error)}.mobile-menu-item.danger:hover{background:#f871711a}@media (max-width:640px){.desktop-nav{display:none}.burger-btn{display:flex}.header-inner{padding:0 16px}.logo-text{font-size:16px}}.header-nav-link{border-radius:var(--radius-sm);color:var(--text-secondary);font-size:14px;font-weight:500;padding:6px 12px;transition:all var(--transition)}.header-nav-link:hover{background:var(--bg-card);color:var(--text-primary)}.header-nav-link.active{background:var(--accent-light);color:var(--accent)}.footer{background:var(--bg-card);border-top:1px solid var(--border);margin-top:auto;padding:40px 0 24px}.footer-inner{grid-gap:32px;align-items:start;display:grid;gap:32px;grid-template-columns:2fr 1fr 1fr 1fr;margin:0 auto;max-width:1200px;padding:0 24px}.footer-logo{color:var(--text-primary);font-size:20px;font-weight:800;margin-bottom:4px}.footer-logo-ai{background:var(--accent);border-radius:4px;color:#fff;font-size:11px;font-weight:700;margin-left:4px;padding:2px 6px;vertical-align:middle}.footer-tagline{color:var(--text-secondary);font-size:13px;margin-bottom:10px}.footer-copy{color:var(--text-muted);font-size:12px}.footer-section{display:flex;flex-direction:column;gap:8px}.footer-section-title{color:var(--text-primary);font-size:13px;font-weight:700;letter-spacing:.05em;margin-bottom:4px;text-transform:uppercase}.footer-link,.footer-section p{color:var(--text-secondary);font-size:13px}.footer-link{background:none;border:none;cursor:pointer;display:block;padding:0;text-align:left;text-decoration:none;transition:color var(--transition)}.footer-link:hover{color:var(--accent)}.footer-modal-overlay{align-items:center;animation:fadeIn .2s ease;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#000000b3;display:flex;inset:0;justify-content:center;padding:16px;position:fixed;z-index:200}.footer-modal{animation:slideUp .25s ease;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);display:flex;flex-direction:column;max-height:85vh;max-width:720px;width:100%}.footer-modal-header{align-items:center;border-bottom:1px solid var(--border);display:flex;flex-shrink:0;justify-content:space-between;padding:20px 24px 16px}.footer-modal-title{color:var(--text-primary);font-size:18px;font-weight:700}.footer-modal-close{background:none;border:none;border-radius:var(--radius-sm);color:var(--text-muted);cursor:pointer;font-size:18px;padding:4px 8px;transition:all var(--transition)}.footer-modal-close:hover{background:var(--bg-secondary);color:var(--text-primary)}.footer-modal-body{flex:1 1;line-height:1.7;overflow-y:auto;padding:24px}.footer-modal-body p{color:var(--text-secondary);font-size:14px;margin-bottom:6px}.footer-modal-heading{color:var(--text-primary)!important;font-size:13px!important;font-weight:700!important;letter-spacing:.03em;margin-top:16px!important}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@media (max-width:768px){.footer-inner{gap:24px;grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}@media (max-width:480px){.footer-inner{grid-template-columns:1fr}.footer-brand{grid-column:auto}.footer-modal-body,.footer-modal-header{padding:16px}}.home{margin:0 auto;max-width:1100px;padding:40px 24px}.hero{padding:60px 0 40px;text-align:center}.hero h1{font-size:clamp(28px,5vw,48px);font-weight:800;line-height:1.2;margin-bottom:16px}.accent{color:var(--accent)}.hero-sub{font-size:18px;margin:0 auto 24px;max-width:600px}.hero-badges,.hero-sub{color:var(--text-secondary)}.hero-badges{display:flex;flex-wrap:wrap;font-size:14px;gap:12px;justify-content:center}.hero-badges span{background:var(--bg-card);border:1px solid var(--border);border-radius:20px;padding:6px 14px}.languages-section{margin:40px 0}.languages-section h2{font-size:22px;margin-bottom:24px;text-align:center}.languages-grid{grid-gap:16px;display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}.lang-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;padding:24px 16px;position:relative;text-align:center;transition:all var(--transition)}.lang-card:hover{background:var(--bg-card-hover);border-color:var(--accent);box-shadow:0 8px 30px #6c63ff33;transform:translateY(-3px)}.lang-flag{display:block;font-size:36px;margin-bottom:8px}.lang-name{font-size:15px;font-weight:600}.lang-badge{background:var(--accent);border-radius:4px;color:#fff;font-size:10px;padding:2px 6px;position:absolute;right:8px;top:8px}.features{grid-gap:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin-top:40px}.feature-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px 20px;text-align:center}.feature-card span{display:block;font-size:32px;margin-bottom:12px}.feature-card h3{font-size:16px;margin-bottom:8px}.feature-card p{color:var(--text-secondary);font-size:14px}.chat-page{display:flex;height:calc(100vh - 60px);position:relative}.chat-sidebar{background:var(--bg-secondary);border-right:1px solid var(--border);display:flex;flex-direction:column;gap:4px;min-width:200px;overflow-y:auto;padding:16px 12px;transition:transform .3s ease;width:200px}.sidebar-title{color:var(--text-muted);font-size:11px;letter-spacing:1px;margin-bottom:8px;padding:0 8px;text-transform:uppercase}.lang-btn{align-items:center;background:#0000;border-radius:var(--radius-sm);color:var(--text-secondary);display:flex;font-size:13px;gap:8px;padding:10px;text-align:left;transition:all var(--transition);width:100%}.lang-btn:hover{background:var(--bg-card);color:var(--text-primary)}.lang-btn.active{background:var(--accent-light);color:var(--accent);font-weight:600}.sidebar-sub-promo{background:linear-gradient(135deg,#6c63ff22,#6c63ff44);border:1px solid var(--accent);border-radius:var(--radius-sm);color:var(--accent);cursor:pointer;font-size:12px;margin-top:auto;padding:10px;text-align:center}.sidebar-sub-promo:hover{background:var(--accent-light)}.chat-main{display:flex;flex:1 1;flex-direction:column;overflow:hidden}.chat-header{align-items:center;background:var(--bg-secondary);border-bottom:1px solid var(--border);display:flex;justify-content:space-between;padding:14px 20px}.chat-lang-title{font-size:15px;font-weight:600}.msg-counter{background:var(--bg-card);border-radius:20px;color:var(--text-secondary);font-size:13px;padding:4px 10px}.msg-counter.danger{border:1px solid var(--error);color:var(--error)}.pro-label{color:#fbbf24;font-size:13px}.guest-label{color:var(--text-muted);font-size:13px}.messages{display:flex;flex:1 1;flex-direction:column;gap:16px;overflow-y:auto;padding:20px}.empty-state{color:var(--text-muted);margin:auto;padding:40px;text-align:center}.empty-state h3{color:var(--text-secondary);font-size:18px;margin:12px 0 8px}.empty-state p{font-size:14px}.message{display:flex;gap:12px;max-width:800px}.message.user{flex-direction:row-reverse;margin-left:auto}.message-avatar{align-items:center;border-radius:50%;display:flex;flex-shrink:0;font-size:16px;height:36px;justify-content:center;width:36px}.message-avatar,.message-content{background:var(--bg-card);border:1px solid var(--border)}.message-content{border-radius:var(--radius);font-size:14px;line-height:1.7;max-width:calc(100% - 50px);padding:12px 16px}.message.user .message-content{background:var(--accent-light);border-color:var(--accent)}.message-content p{margin:0}.message-content p+p{margin-top:8px}.typing{align-items:center;display:flex;gap:4px;padding:16px!important}.typing span{animation:bounce 1.2s infinite;background:var(--text-muted);border-radius:50%;height:8px;width:8px}.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,80%,to{opacity:.5;transform:scale(.8)}40%{opacity:1;transform:scale(1)}}.chat-input-area{align-items:flex-end;background:var(--bg-secondary);border-top:1px solid var(--border);display:flex;gap:12px;padding:16px 20px}.chat-input-area textarea{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);flex:1 1;font-size:14px;line-height:1.5;padding:12px 16px;resize:none;transition:border-color var(--transition)}.chat-input-area textarea:focus{border-color:var(--accent)}.send-btn{background:var(--accent);border-radius:var(--radius-sm);color:#fff;flex-shrink:0;font-size:18px;height:44px;width:44px}.send-btn:hover:not(:disabled){background:var(--accent-hover)}.send-btn:disabled{cursor:not-allowed;opacity:.4}.mobile-lang-btn{display:none}@media (max-width:640px){.chat-sidebar{border-radius:20px 20px 0 0;border-right:none;border-top:1px solid var(--border);bottom:0;box-shadow:0 -8px 40px #00000080;height:auto;left:0;max-height:70vh;min-width:0;min-width:auto;overflow-y:auto;padding:20px 16px 40px;position:fixed;right:0;transform:translateY(100%);width:100%;z-index:200}.chat-sidebar.open{transform:translateY(0)}.chat-sidebar:before{background:var(--border-light);border-radius:2px;content:"";display:block;height:4px;margin:0 auto 16px;width:40px}.lang-grid-mobile{grid-gap:8px;display:grid;gap:8px;grid-template-columns:1fr 1fr}.lang-btn{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:13px;justify-content:flex-start;padding:12px 10px}.lang-btn.active{background:var(--accent-light);border-color:var(--accent)}.sidebar-sub-promo{margin-top:12px}.sidebar-overlay{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#0009;display:none;inset:0;position:fixed;z-index:199}.sidebar-overlay.visible{display:block}.mobile-lang-btn{align-items:center;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);cursor:pointer;display:flex!important;font-size:13px;gap:6px;padding:6px 12px}.mobile-lang-btn:hover{border-color:var(--accent)}.chat-lang-title{display:none!important}.messages{gap:12px;padding:12px}.message-content{font-size:13px}.chat-header,.chat-input-area{padding:10px 12px}}.level-dropdown{position:relative}.level-btn{align-items:center;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);cursor:pointer;display:flex;font-size:13px;gap:6px;padding:5px 10px;transition:all var(--transition);white-space:nowrap}.level-btn:hover{border-color:var(--accent)}.level-code{color:var(--accent);font-size:13px;font-weight:700}.level-name-short{color:var(--text-secondary);font-size:12px}.level-arrow{color:var(--text-muted);display:inline-block;font-size:10px;transition:transform .2s ease}.level-arrow.open{transform:rotate(180deg)}.level-menu{animation:slideDown .15s ease;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 8px 30px #0000004d;left:0;min-width:200px;overflow:hidden;position:absolute;top:calc(100% + 6px);z-index:50}.level-menu-title{color:var(--text-muted);font-size:11px;font-weight:700;letter-spacing:.06em;padding:10px 14px 6px;text-transform:uppercase}.level-menu-item{align-items:center;background:#0000;border:none;color:var(--text-primary);cursor:pointer;display:flex;gap:10px;padding:10px 14px;text-align:left;transition:background var(--transition);width:100%}.level-menu-item:hover{background:var(--bg-secondary)}.level-menu-item.active{background:#6c63ff1a;background:var(--accent-light,#6c63ff1a)}.level-menu-code{color:var(--accent);font-size:13px;font-weight:700;min-width:28px}.level-menu-name{flex:1 1;font-size:13px}.level-check{color:var(--accent);font-size:14px;font-weight:700}@media (max-width:640px){.level-btn{padding:5px 8px}}.message-wrapper{display:flex;flex-direction:column;gap:6px}.message-actions{display:flex;flex-wrap:wrap;gap:6px}.assistant-actions{padding-left:48px}.user-actions{justify-content:flex-end;padding-right:48px}.msg-action-btn{align-items:center;background:var(--bg-secondary);border:1px solid var(--border);border-radius:20px;color:var(--text-secondary);cursor:pointer;display:inline-flex;font-size:12px;gap:4px;padding:4px 12px;transition:all var(--transition);white-space:nowrap}.msg-action-btn:hover:not(:disabled){background:var(--accent-light);border-color:var(--accent);color:var(--accent)}.msg-action-btn:disabled{cursor:not-allowed;opacity:.4}.evaluate-btn{background:var(--accent-light);border-color:var(--accent);color:var(--accent)}.evaluate-btn:hover:not(:disabled){background:var(--accent);color:#fff}@media (max-width:640px){.assistant-actions{padding-left:0}.user-actions{justify-content:flex-start;padding-right:0}.msg-action-btn{font-size:11px;padding:4px 10px}}.vocab-btn{border-color:#22c55e44;color:#22c55e}.vocab-btn:hover:not(:disabled){background:#22c55e18;border-color:#22c55e;color:#22c55e}.vocab-popup-overlay{align-items:center;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#0009;display:flex;inset:0;justify-content:center;padding:20px;position:fixed;z-index:300}.vocab-popup{animation:slideDown .2s ease;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 20px 60px #0006;max-width:380px;width:100%}.vocab-popup-header{align-items:center;border-bottom:1px solid var(--border);display:flex;font-size:15px;font-weight:600;justify-content:space-between;padding:16px 20px}.vocab-popup-close{background:#0000;border-radius:var(--radius-sm);color:var(--text-muted);font-size:14px;padding:4px 8px;transition:all var(--transition)}.vocab-popup-close:hover{background:var(--bg-card);color:var(--text-primary)}.vocab-popup-lang{align-items:center;color:var(--text-muted);display:flex;font-size:13px;gap:6px;margin-bottom:4px}.vocab-popup-body{display:flex;flex-direction:column;gap:10px;padding:16px 20px}.vocab-popup-input{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:14px;padding:10px 14px;transition:border-color var(--transition)}.vocab-popup-input:focus{border-color:var(--accent)}.vocab-popup-footer{border-top:1px solid var(--border);display:flex;gap:10px;justify-content:flex-end;padding:12px 20px}.vocab-popup-cancel{background:#0000;border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:13px;padding:8px 16px;transition:all var(--transition)}.vocab-popup-cancel:hover{border-color:var(--accent);color:var(--text-primary)}.vocab-popup-save{background:var(--accent);border-radius:var(--radius-sm);color:#fff;font-size:13px;font-weight:600;padding:8px 20px;transition:background var(--transition)}.vocab-popup-save:hover:not(:disabled){background:var(--accent-hover)}.vocab-popup-save:disabled{cursor:not-allowed;opacity:.4}.vocab-popup-success{color:#22c55e;font-size:15px;font-weight:600;padding:30px 20px;text-align:center}.vocab-page{margin:0 auto;max-width:860px;padding:24px 20px}.vocab-tabs{border-bottom:1px solid var(--border);display:flex;gap:8px;margin-bottom:24px;padding-bottom:0}.vocab-tab{background:#0000;border-bottom:2px solid #0000;color:var(--text-muted);font-size:14px;font-weight:600;margin-bottom:-1px;padding:10px 20px;transition:all 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